GDI+ problem

Collapse
This topic is closed.
X
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Pohihihi
    #1

    GDI+ problem

    I am getting a generic GDI+ error on following code. Basically it is trying
    to capture screen image and save in a file.
    Is there a way to find more details on this error? Thanks for the help.

    ---------------------------
    ERROR MSG
    ---------------------------
    System.Runtime. InteropServices .ExternalExcept ion: A generic error occurred
    in GDI+.
    at System.Drawing. Image.Save(Stri ng filename, ImageCodecInfo encoder,
    EncoderParamete rs encoderParams)
    at System.Drawing. Image.Save(Stri ng filename, ImageFormat format)
    at ScreenCapture.F orm1.TakeSnapNo w() in c:\visual studio
    projects\screen capture\form1.c s:line 102



    Sorry for the formating below.

    //First, you need to import the BitBlt, GetDC and ReleaseDC functions.

    //imports the GDI BitBlt function that enables the background of the window

    //to be captured

    [DllImport("gdi3 2.dll")]

    private static extern bool BitBlt(

    IntPtr hdcDest, // handle to destination DC

    int nXDest, // x-coord of destination upper-left corner

    int nYDest, // y-coord of destination upper-left corner

    int nWidth, // width of destination rectangle

    int nHeight, // height of destination rectangle

    IntPtr hdcSrc, // handle to source DC

    int nXSrc, // x-coordinate of source upper-left corner

    int nYSrc, // y-coordinate of source upper-left corner

    System.Int32 dwRop // raster operation code

    );


    [DllImport("User 32.dll")]

    public extern static System.IntPtr GetDC(System.In tPtr hWnd);

    [DllImport("User 32.dll")]

    public extern static int ReleaseDC(Syste m.IntPtr hWnd, System.IntPtr hDC);
    //modified to include hWnd


    //Now, to capture the screen in it's entirety you can do the following.

    public void TakeSnapNow()

    {

    System.IntPtr desktopDC=GetDC (System.IntPtr. Zero);

    Bitmap bm=new Bitmap(SystemIn formation.Virtu alScreen.Width,
    SystemInformati on.VirtualScree n.Height);

    try

    {

    Graphics g=Graphics.From Image(bm);

    System.IntPtr bmDC=g.GetHdc() ;

    BitBlt(bmDC,0,0 ,bm.Width,bm.He ight,desktopDC, 0,0,0x00CC0020 /*SRCCOPY*/);

    bm.Save("C:\fil e.bmp",System.D rawing.Imaging. ImageFormat.Bmp );

    ReleaseDC(Syste m.IntPtr.Zero, desktopDC);

    g.ReleaseHdc(bm DC);

    g.Dispose();

    }

    catch(Exception er)

    {

    MessageBox.Show (er.ToString()) ;

    }

    }



    Tags: None
    • Mark R. Dawson
      #2
      RE: GDI+ problem



      "Pohihihi" wrote:
      [color=blue]
      > I am getting a generic GDI+ error on following code. Basically it is trying
      > to capture screen image and save in a file.
      > Is there a way to find more details on this error? Thanks for the help.
      >
      > ---------------------------
      > ERROR MSG
      > ---------------------------
      > System.Runtime. InteropServices .ExternalExcept ion: A generic error occurred
      > in GDI+.
      > at System.Drawing. Image.Save(Stri ng filename, ImageCodecInfo encoder,
      > EncoderParamete rs encoderParams)
      > at System.Drawing. Image.Save(Stri ng filename, ImageFormat format)
      > at ScreenCapture.F orm1.TakeSnapNo w() in c:\visual studio
      > projects\screen capture\form1.c s:line 102
      >
      >
      >
      > Sorry for the formating below.
      >
      > //First, you need to import the BitBlt, GetDC and ReleaseDC functions.
      >
      > //imports the GDI BitBlt function that enables the background of the window
      >
      > //to be captured
      >
      > [DllImport("gdi3 2.dll")]
      >
      > private static extern bool BitBlt(
      >
      > IntPtr hdcDest, // handle to destination DC
      >
      > int nXDest, // x-coord of destination upper-left corner
      >
      > int nYDest, // y-coord of destination upper-left corner
      >
      > int nWidth, // width of destination rectangle
      >
      > int nHeight, // height of destination rectangle
      >
      > IntPtr hdcSrc, // handle to source DC
      >
      > int nXSrc, // x-coordinate of source upper-left corner
      >
      > int nYSrc, // y-coordinate of source upper-left corner
      >
      > System.Int32 dwRop // raster operation code
      >
      > );
      >
      >
      > [DllImport("User 32.dll")]
      >
      > public extern static System.IntPtr GetDC(System.In tPtr hWnd);
      >
      > [DllImport("User 32.dll")]
      >
      > public extern static int ReleaseDC(Syste m.IntPtr hWnd, System.IntPtr hDC);
      > //modified to include hWnd
      >
      >
      > //Now, to capture the screen in it's entirety you can do the following.
      >
      > public void TakeSnapNow()
      >
      > {
      >
      > System.IntPtr desktopDC=GetDC (System.IntPtr. Zero);
      >
      > Bitmap bm=new Bitmap(SystemIn formation.Virtu alScreen.Width,
      > SystemInformati on.VirtualScree n.Height);
      >
      > try
      >
      > {
      >
      > Graphics g=Graphics.From Image(bm);
      >
      > System.IntPtr bmDC=g.GetHdc() ;
      >
      > BitBlt(bmDC,0,0 ,bm.Width,bm.He ight,desktopDC, 0,0,0x00CC0020 /*SRCCOPY*/);
      >
      > bm.Save("C:\fil e.bmp",System.D rawing.Imaging. ImageFormat.Bmp );
      >
      > ReleaseDC(Syste m.IntPtr.Zero, desktopDC);
      >
      > g.ReleaseHdc(bm DC);
      >
      > g.Dispose();
      >
      > }
      >
      > catch(Exception er)
      >
      > {
      >
      > MessageBox.Show (er.ToString()) ;
      >
      > }
      >
      > }
      >
      >
      >
      >[/color]

        Comment

        • Mark R. Dawson
          #3
          RE: GDI+ problem

          Hi Pohihihi,
          on the line:

          bm.Save("C:\fil e.bmp",System.D rawing.Imaging. ImageFormat.Bmp );

          I believe that having a single \ will cause problems because \<char> is
          regarded as an escape character.

          Try:
          bm.Save(@"C:\fi le.bmp",System. Drawing.Imaging .ImageFormat.Bm p);
          which the @ means use the literal value of the string ignoring escape
          characters

          or
          bm.Save("C:\\fi le.bmp",System. Drawing.Imaging .ImageFormat.Bm p);


          Hope that helps.
          Mark

          "Pohihihi" wrote:
          [color=blue]
          > I am getting a generic GDI+ error on following code. Basically it is trying
          > to capture screen image and save in a file.
          > Is there a way to find more details on this error? Thanks for the help.
          >
          > ---------------------------
          > ERROR MSG
          > ---------------------------
          > System.Runtime. InteropServices .ExternalExcept ion: A generic error occurred
          > in GDI+.
          > at System.Drawing. Image.Save(Stri ng filename, ImageCodecInfo encoder,
          > EncoderParamete rs encoderParams)
          > at System.Drawing. Image.Save(Stri ng filename, ImageFormat format)
          > at ScreenCapture.F orm1.TakeSnapNo w() in c:\visual studio
          > projects\screen capture\form1.c s:line 102
          >
          >
          >
          > Sorry for the formating below.
          >
          > //First, you need to import the BitBlt, GetDC and ReleaseDC functions.
          >
          > //imports the GDI BitBlt function that enables the background of the window
          >
          > //to be captured
          >
          > [DllImport("gdi3 2.dll")]
          >
          > private static extern bool BitBlt(
          >
          > IntPtr hdcDest, // handle to destination DC
          >
          > int nXDest, // x-coord of destination upper-left corner
          >
          > int nYDest, // y-coord of destination upper-left corner
          >
          > int nWidth, // width of destination rectangle
          >
          > int nHeight, // height of destination rectangle
          >
          > IntPtr hdcSrc, // handle to source DC
          >
          > int nXSrc, // x-coordinate of source upper-left corner
          >
          > int nYSrc, // y-coordinate of source upper-left corner
          >
          > System.Int32 dwRop // raster operation code
          >
          > );
          >
          >
          > [DllImport("User 32.dll")]
          >
          > public extern static System.IntPtr GetDC(System.In tPtr hWnd);
          >
          > [DllImport("User 32.dll")]
          >
          > public extern static int ReleaseDC(Syste m.IntPtr hWnd, System.IntPtr hDC);
          > //modified to include hWnd
          >
          >
          > //Now, to capture the screen in it's entirety you can do the following.
          >
          > public void TakeSnapNow()
          >
          > {
          >
          > System.IntPtr desktopDC=GetDC (System.IntPtr. Zero);
          >
          > Bitmap bm=new Bitmap(SystemIn formation.Virtu alScreen.Width,
          > SystemInformati on.VirtualScree n.Height);
          >
          > try
          >
          > {
          >
          > Graphics g=Graphics.From Image(bm);
          >
          > System.IntPtr bmDC=g.GetHdc() ;
          >
          > BitBlt(bmDC,0,0 ,bm.Width,bm.He ight,desktopDC, 0,0,0x00CC0020 /*SRCCOPY*/);
          >
          > bm.Save("C:\fil e.bmp",System.D rawing.Imaging. ImageFormat.Bmp );
          >
          > ReleaseDC(Syste m.IntPtr.Zero, desktopDC);
          >
          > g.ReleaseHdc(bm DC);
          >
          > g.Dispose();
          >
          > }
          >
          > catch(Exception er)
          >
          > {
          >
          > MessageBox.Show (er.ToString()) ;
          >
          > }
          >
          > }
          >
          >
          >
          >[/color]

            Comment

            • Pohihihi
              #4
              Re: GDI+ problem

              Thanks Mark that was the real cause. I was looking all around to find the
              problem.
              I am still interested in learning how to trap errors while using interops.


              "Mark R. Dawson" <MarkRDawson@di scussions.micro soft.com> wrote in message
              news:5186DA9D-7726-4CE2-95A3-C3BE6B9BB5A3@mi crosoft.com...[color=blue]
              > Hi Pohihihi,
              > on the line:
              >
              > bm.Save("C:\fil e.bmp",System.D rawing.Imaging. ImageFormat.Bmp );
              >
              > I believe that having a single \ will cause problems because \<char> is
              > regarded as an escape character.
              >
              > Try:
              > bm.Save(@"C:\fi le.bmp",System. Drawing.Imaging .ImageFormat.Bm p);
              > which the @ means use the literal value of the string ignoring escape
              > characters
              >
              > or
              > bm.Save("C:\\fi le.bmp",System. Drawing.Imaging .ImageFormat.Bm p);
              >
              >
              > Hope that helps.
              > Mark
              >
              > "Pohihihi" wrote:
              >[color=green]
              >> I am getting a generic GDI+ error on following code. Basically it is
              >> trying
              >> to capture screen image and save in a file.
              >> Is there a way to find more details on this error? Thanks for the help.
              >>
              >> ---------------------------
              >> ERROR MSG
              >> ---------------------------
              >> System.Runtime. InteropServices .ExternalExcept ion: A generic error
              >> occurred
              >> in GDI+.
              >> at System.Drawing. Image.Save(Stri ng filename, ImageCodecInfo encoder,
              >> EncoderParamete rs encoderParams)
              >> at System.Drawing. Image.Save(Stri ng filename, ImageFormat format)
              >> at ScreenCapture.F orm1.TakeSnapNo w() in c:\visual studio
              >> projects\screen capture\form1.c s:line 102
              >>
              >>
              >>
              >> Sorry for the formating below.
              >>
              >> //First, you need to import the BitBlt, GetDC and ReleaseDC functions.
              >>
              >> //imports the GDI BitBlt function that enables the background of the
              >> window
              >>
              >> //to be captured
              >>
              >> [DllImport("gdi3 2.dll")]
              >>
              >> private static extern bool BitBlt(
              >>
              >> IntPtr hdcDest, // handle to destination DC
              >>
              >> int nXDest, // x-coord of destination upper-left corner
              >>
              >> int nYDest, // y-coord of destination upper-left corner
              >>
              >> int nWidth, // width of destination rectangle
              >>
              >> int nHeight, // height of destination rectangle
              >>
              >> IntPtr hdcSrc, // handle to source DC
              >>
              >> int nXSrc, // x-coordinate of source upper-left corner
              >>
              >> int nYSrc, // y-coordinate of source upper-left corner
              >>
              >> System.Int32 dwRop // raster operation code
              >>
              >> );
              >>
              >>
              >> [DllImport("User 32.dll")]
              >>
              >> public extern static System.IntPtr GetDC(System.In tPtr hWnd);
              >>
              >> [DllImport("User 32.dll")]
              >>
              >> public extern static int ReleaseDC(Syste m.IntPtr hWnd, System.IntPtr
              >> hDC);
              >> //modified to include hWnd
              >>
              >>
              >> //Now, to capture the screen in it's entirety you can do the following.
              >>
              >> public void TakeSnapNow()
              >>
              >> {
              >>
              >> System.IntPtr desktopDC=GetDC (System.IntPtr. Zero);
              >>
              >> Bitmap bm=new Bitmap(SystemIn formation.Virtu alScreen.Width,
              >> SystemInformati on.VirtualScree n.Height);
              >>
              >> try
              >>
              >> {
              >>
              >> Graphics g=Graphics.From Image(bm);
              >>
              >> System.IntPtr bmDC=g.GetHdc() ;
              >>
              >> BitBlt(bmDC,0,0 ,bm.Width,bm.He ight,desktopDC, 0,0,0x00CC0020 /*SRCCOPY*/);
              >>
              >> bm.Save("C:\fil e.bmp",System.D rawing.Imaging. ImageFormat.Bmp );
              >>
              >> ReleaseDC(Syste m.IntPtr.Zero, desktopDC);
              >>
              >> g.ReleaseHdc(bm DC);
              >>
              >> g.Dispose();
              >>
              >> }
              >>
              >> catch(Exception er)
              >>
              >> {
              >>
              >> MessageBox.Show (er.ToString()) ;
              >>
              >> }
              >>
              >> }
              >>
              >>
              >>
              >>[/color][/color]


                Comment

                • Mark R. Dawson
                  #5
                  Re: GDI+ problem

                  For looking what the exact error was through the interop services you can get
                  the last error from the Win32 calls, although you cannot call the
                  GetLastError method directly, you must go through a method called
                  GetLastWin32Err or.

                  Basically make sure you have imported the namespace
                  System.Runtime. InteropServices then when you import a DLL you need to set the
                  SetLastError property to true i.e.

                  [DllImport("gdi3 2.dll", SetLastError=tr ue)]

                  Then when you have an exception you can do:

                  intError = Marshal.GetLast Win32Error();

                  which returns the error code.

                  I am not an expert in this, but this might be enough to get you pointed in
                  the right direction.

                  Hope that helps
                  Mark.

                  "Pohihihi" wrote:
                  [color=blue]
                  > Thanks Mark that was the real cause. I was looking all around to find the
                  > problem.
                  > I am still interested in learning how to trap errors while using interops.
                  >
                  >
                  > "Mark R. Dawson" <MarkRDawson@di scussions.micro soft.com> wrote in message
                  > news:5186DA9D-7726-4CE2-95A3-C3BE6B9BB5A3@mi crosoft.com...[color=green]
                  > > Hi Pohihihi,
                  > > on the line:
                  > >
                  > > bm.Save("C:\fil e.bmp",System.D rawing.Imaging. ImageFormat.Bmp );
                  > >
                  > > I believe that having a single \ will cause problems because \<char> is
                  > > regarded as an escape character.
                  > >
                  > > Try:
                  > > bm.Save(@"C:\fi le.bmp",System. Drawing.Imaging .ImageFormat.Bm p);
                  > > which the @ means use the literal value of the string ignoring escape
                  > > characters
                  > >
                  > > or
                  > > bm.Save("C:\\fi le.bmp",System. Drawing.Imaging .ImageFormat.Bm p);
                  > >
                  > >
                  > > Hope that helps.
                  > > Mark
                  > >
                  > > "Pohihihi" wrote:
                  > >[color=darkred]
                  > >> I am getting a generic GDI+ error on following code. Basically it is
                  > >> trying
                  > >> to capture screen image and save in a file.
                  > >> Is there a way to find more details on this error? Thanks for the help.
                  > >>
                  > >> ---------------------------
                  > >> ERROR MSG
                  > >> ---------------------------
                  > >> System.Runtime. InteropServices .ExternalExcept ion: A generic error
                  > >> occurred
                  > >> in GDI+.
                  > >> at System.Drawing. Image.Save(Stri ng filename, ImageCodecInfo encoder,
                  > >> EncoderParamete rs encoderParams)
                  > >> at System.Drawing. Image.Save(Stri ng filename, ImageFormat format)
                  > >> at ScreenCapture.F orm1.TakeSnapNo w() in c:\visual studio
                  > >> projects\screen capture\form1.c s:line 102
                  > >>
                  > >>
                  > >>
                  > >> Sorry for the formating below.
                  > >>
                  > >> //First, you need to import the BitBlt, GetDC and ReleaseDC functions.
                  > >>
                  > >> //imports the GDI BitBlt function that enables the background of the
                  > >> window
                  > >>
                  > >> //to be captured
                  > >>
                  > >> [DllImport("gdi3 2.dll")]
                  > >>
                  > >> private static extern bool BitBlt(
                  > >>
                  > >> IntPtr hdcDest, // handle to destination DC
                  > >>
                  > >> int nXDest, // x-coord of destination upper-left corner
                  > >>
                  > >> int nYDest, // y-coord of destination upper-left corner
                  > >>
                  > >> int nWidth, // width of destination rectangle
                  > >>
                  > >> int nHeight, // height of destination rectangle
                  > >>
                  > >> IntPtr hdcSrc, // handle to source DC
                  > >>
                  > >> int nXSrc, // x-coordinate of source upper-left corner
                  > >>
                  > >> int nYSrc, // y-coordinate of source upper-left corner
                  > >>
                  > >> System.Int32 dwRop // raster operation code
                  > >>
                  > >> );
                  > >>
                  > >>
                  > >> [DllImport("User 32.dll")]
                  > >>
                  > >> public extern static System.IntPtr GetDC(System.In tPtr hWnd);
                  > >>
                  > >> [DllImport("User 32.dll")]
                  > >>
                  > >> public extern static int ReleaseDC(Syste m.IntPtr hWnd, System.IntPtr
                  > >> hDC);
                  > >> //modified to include hWnd
                  > >>
                  > >>
                  > >> //Now, to capture the screen in it's entirety you can do the following.
                  > >>
                  > >> public void TakeSnapNow()
                  > >>
                  > >> {
                  > >>
                  > >> System.IntPtr desktopDC=GetDC (System.IntPtr. Zero);
                  > >>
                  > >> Bitmap bm=new Bitmap(SystemIn formation.Virtu alScreen.Width,
                  > >> SystemInformati on.VirtualScree n.Height);
                  > >>
                  > >> try
                  > >>
                  > >> {
                  > >>
                  > >> Graphics g=Graphics.From Image(bm);
                  > >>
                  > >> System.IntPtr bmDC=g.GetHdc() ;
                  > >>
                  > >> BitBlt(bmDC,0,0 ,bm.Width,bm.He ight,desktopDC, 0,0,0x00CC0020 /*SRCCOPY*/);
                  > >>
                  > >> bm.Save("C:\fil e.bmp",System.D rawing.Imaging. ImageFormat.Bmp );
                  > >>
                  > >> ReleaseDC(Syste m.IntPtr.Zero, desktopDC);
                  > >>
                  > >> g.ReleaseHdc(bm DC);
                  > >>
                  > >> g.Dispose();
                  > >>
                  > >> }
                  > >>
                  > >> catch(Exception er)
                  > >>
                  > >> {
                  > >>
                  > >> MessageBox.Show (er.ToString()) ;
                  > >>
                  > >> }
                  > >>
                  > >> }
                  > >>
                  > >>
                  > >>
                  > >>[/color][/color]
                  >
                  >
                  >[/color]

                    Comment

                    • Pohihihi
                      #6
                      Re: GDI+ problem

                      Thanks Mark, it is a nice start for me, I will dig more in interops on MSDN.


                      "Mark R. Dawson" <MarkRDawson@di scussions.micro soft.com> wrote in message
                      news:EFB6117F-9C66-4280-B0CE-A4543A3AF0FE@mi crosoft.com...[color=blue]
                      > For looking what the exact error was through the interop services you can
                      > get
                      > the last error from the Win32 calls, although you cannot call the
                      > GetLastError method directly, you must go through a method called
                      > GetLastWin32Err or.
                      >
                      > Basically make sure you have imported the namespace
                      > System.Runtime. InteropServices then when you import a DLL you need to set
                      > the
                      > SetLastError property to true i.e.
                      >
                      > [DllImport("gdi3 2.dll", SetLastError=tr ue)]
                      >
                      > Then when you have an exception you can do:
                      >
                      > intError = Marshal.GetLast Win32Error();
                      >
                      > which returns the error code.
                      >
                      > I am not an expert in this, but this might be enough to get you pointed in
                      > the right direction.
                      >
                      > Hope that helps
                      > Mark.
                      >
                      > "Pohihihi" wrote:
                      >[color=green]
                      >> Thanks Mark that was the real cause. I was looking all around to find the
                      >> problem.
                      >> I am still interested in learning how to trap errors while using
                      >> interops.
                      >>
                      >>
                      >> "Mark R. Dawson" <MarkRDawson@di scussions.micro soft.com> wrote in message
                      >> news:5186DA9D-7726-4CE2-95A3-C3BE6B9BB5A3@mi crosoft.com...[color=darkred]
                      >> > Hi Pohihihi,
                      >> > on the line:
                      >> >
                      >> > bm.Save("C:\fil e.bmp",System.D rawing.Imaging. ImageFormat.Bmp );
                      >> >
                      >> > I believe that having a single \ will cause problems because \<char> is
                      >> > regarded as an escape character.
                      >> >
                      >> > Try:
                      >> > bm.Save(@"C:\fi le.bmp",System. Drawing.Imaging .ImageFormat.Bm p);
                      >> > which the @ means use the literal value of the string ignoring escape
                      >> > characters
                      >> >
                      >> > or
                      >> > bm.Save("C:\\fi le.bmp",System. Drawing.Imaging .ImageFormat.Bm p);
                      >> >
                      >> >
                      >> > Hope that helps.
                      >> > Mark
                      >> >
                      >> > "Pohihihi" wrote:
                      >> >
                      >> >> I am getting a generic GDI+ error on following code. Basically it is
                      >> >> trying
                      >> >> to capture screen image and save in a file.
                      >> >> Is there a way to find more details on this error? Thanks for the
                      >> >> help.
                      >> >>
                      >> >> ---------------------------
                      >> >> ERROR MSG
                      >> >> ---------------------------
                      >> >> System.Runtime. InteropServices .ExternalExcept ion: A generic error
                      >> >> occurred
                      >> >> in GDI+.
                      >> >> at System.Drawing. Image.Save(Stri ng filename, ImageCodecInfo
                      >> >> encoder,
                      >> >> EncoderParamete rs encoderParams)
                      >> >> at System.Drawing. Image.Save(Stri ng filename, ImageFormat format)
                      >> >> at ScreenCapture.F orm1.TakeSnapNo w() in c:\visual studio
                      >> >> projects\screen capture\form1.c s:line 102
                      >> >>
                      >> >>
                      >> >>
                      >> >> Sorry for the formating below.
                      >> >>
                      >> >> //First, you need to import the BitBlt, GetDC and ReleaseDC functions.
                      >> >>
                      >> >> //imports the GDI BitBlt function that enables the background of the
                      >> >> window
                      >> >>
                      >> >> //to be captured
                      >> >>
                      >> >> [DllImport("gdi3 2.dll")]
                      >> >>
                      >> >> private static extern bool BitBlt(
                      >> >>
                      >> >> IntPtr hdcDest, // handle to destination DC
                      >> >>
                      >> >> int nXDest, // x-coord of destination upper-left corner
                      >> >>
                      >> >> int nYDest, // y-coord of destination upper-left corner
                      >> >>
                      >> >> int nWidth, // width of destination rectangle
                      >> >>
                      >> >> int nHeight, // height of destination rectangle
                      >> >>
                      >> >> IntPtr hdcSrc, // handle to source DC
                      >> >>
                      >> >> int nXSrc, // x-coordinate of source upper-left corner
                      >> >>
                      >> >> int nYSrc, // y-coordinate of source upper-left corner
                      >> >>
                      >> >> System.Int32 dwRop // raster operation code
                      >> >>
                      >> >> );
                      >> >>
                      >> >>
                      >> >> [DllImport("User 32.dll")]
                      >> >>
                      >> >> public extern static System.IntPtr GetDC(System.In tPtr hWnd);
                      >> >>
                      >> >> [DllImport("User 32.dll")]
                      >> >>
                      >> >> public extern static int ReleaseDC(Syste m.IntPtr hWnd, System.IntPtr
                      >> >> hDC);
                      >> >> //modified to include hWnd
                      >> >>
                      >> >>
                      >> >> //Now, to capture the screen in it's entirety you can do the
                      >> >> following.
                      >> >>
                      >> >> public void TakeSnapNow()
                      >> >>
                      >> >> {
                      >> >>
                      >> >> System.IntPtr desktopDC=GetDC (System.IntPtr. Zero);
                      >> >>
                      >> >> Bitmap bm=new Bitmap(SystemIn formation.Virtu alScreen.Width,
                      >> >> SystemInformati on.VirtualScree n.Height);
                      >> >>
                      >> >> try
                      >> >>
                      >> >> {
                      >> >>
                      >> >> Graphics g=Graphics.From Image(bm);
                      >> >>
                      >> >> System.IntPtr bmDC=g.GetHdc() ;
                      >> >>
                      >> >> BitBlt(bmDC,0,0 ,bm.Width,bm.He ight,desktopDC, 0,0,0x00CC0020
                      >> >> /*SRCCOPY*/);
                      >> >>
                      >> >> bm.Save("C:\fil e.bmp",System.D rawing.Imaging. ImageFormat.Bmp );
                      >> >>
                      >> >> ReleaseDC(Syste m.IntPtr.Zero, desktopDC);
                      >> >>
                      >> >> g.ReleaseHdc(bm DC);
                      >> >>
                      >> >> g.Dispose();
                      >> >>
                      >> >> }
                      >> >>
                      >> >> catch(Exception er)
                      >> >>
                      >> >> {
                      >> >>
                      >> >> MessageBox.Show (er.ToString()) ;
                      >> >>
                      >> >> }
                      >> >>
                      >> >> }
                      >> >>
                      >> >>
                      >> >>
                      >> >>[/color]
                      >>
                      >>
                      >>[/color][/color]


                        Comment

                        Previous template Next
                        Working...