Getting Clipboard Handle using GetClipboardData in C#

[Roohi]

hi

I am trying to copy an image to a clipboard and then get a
handle to the clipboard using API calls GetClipboardDat a().

Following is the snippet of our code. Could any one please
point out what am I missing here since I never get the
handle to the object on clipboard

<snippet>

OpenClipboard(0 );

DataObject m_data = new DataObject();

m_data.SetData( DataFormats.Dib ,imgCardImage.I mage);

Clipboard.SetDa taObject(m_data ,false);

hDib = GetClipboardDat a(CF_DIB); // CF_DIB = 8;

</snippet>


hDib returned is always 0 where it actually had to return
a handle to the clipboard;

Thanks in Advance.

~Roohi

[Morten Wennevik]

Re: Getting Clipboard Handle using GetClipboardDat a in C#

Not familiar with GetClipboardDat a.
Why do you need a handle to it instead of using .NET's
ClipBoard.GetDa taObject to retrieve it?

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[Roohi]

Re: Getting Clipboard Handle using GetClipboardDat a in C#

I need to pass this handle to some other API which accepts
handle to the clipboard as a parameter

Hence I need it

Thanks
[color=blue]
>-----Original Message-----
>Not familiar with GetClipboardDat a.
>Why do you need a handle to it instead of using .NET's
>ClipBoard.GetD ataObject to retrieve it?
>
>--
>Using M2, Opera's revolutionary e-mail client:[/color]
http://www.opera.com/m2/[color=blue]
>.
>[/color]

[Morten Wennevik]

Re: Getting Clipboard Handle using GetClipboardDat a in C#

Hm, maybe Clipboard.SetDa taObject() closes the clipboard you opened with
OpenClipboard() .
Try moving OpenClipBoard(0 ); after SetDataObject()


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[Roohi]

Re: Getting Clipboard Handle using GetClipboardDat a in C#

I tried doing that, but still the same problem

Roohi
[color=blue]
>-----Original Message-----
>Hm, maybe Clipboard.SetDa taObject() closes the clipboard[/color]
you opened with[color=blue]
>OpenClipboard( ).
>Try moving OpenClipBoard(0 ); after SetDataObject()
>
>
>--
>Using M2, Opera's revolutionary e-mail client:[/color]
http://www.opera.com/m2/[color=blue]
>.
>[/color]

[Jeff Gaines]

Re: Getting Clipboard Handle using GetClipboardDat a in C#

On Wed, 12 Nov 2003 02:25:33 -0800, "Roohi"
<angelic_soul_i n@hotmail.com> wrote:
[color=blue]
>hi
>
>I am trying to copy an image to a clipboard and then get a
>handle to the clipboard using API calls GetClipboardDat a().
>
>~Roohi[/color]

Roohi

Can you modify this to do what you need:

public static bool JCopyFilesToCli pboard(string[] strFiles, POINT pt)
{
bool blnReturn = false;
byte[] bData;
DROPFILES df = new DROPFILES();
int intChar, intFile, intDataLen, intPos;
IntPtr ipGlobal = IntPtr.Zero;

// Calculate total data length
intDataLen = 0;
for(intFile = 0; intFile <= strFiles.GetUpp erBound(0);
intFile++)
intDataLen += strFiles[intFile].Length + 1;

// Terminating double zero
intDataLen++;

bData = new Byte[intDataLen];
intPos = 0;

// Build null terminated list of files
for(intFile = 0; intFile <= strFiles.GetUpp erBound(0);
intFile++)
{
for(intChar = 0; intChar < strFiles[intFile].Length;
intChar++)
{
bData[intPos++] = (byte)strFiles[intFile][intChar];
}
bData[intPos++] = 0;
}
// Terminating double zero
bData[intPos++] = 0;

// Allocate and get pointer to global memory
int intTotalLen = Marshal.SizeOf( df) + intDataLen;
ipGlobal = Marshal.AllocHG lobal(intTotalL en);

if(ipGlobal == IntPtr.Zero)
return false;

// Build DROPFILES structure in global memory.
df.pFiles = Marshal.SizeOf( df);
df.pt = pt;
df.fNC = false;
df.fWide = 0;
Marshal.Structu reToPtr(df, ipGlobal, true);
IntPtr ipNew = new IntPtr(ipGlobal .ToInt32() +
Marshal.SizeOf( df));
Marshal.Copy(bD ata, 0, ipNew, intDataLen);

// Open and empty clipboard
if(!OpenClipboa rd(IntPtr.Zero) )
return false;

EmptyClipboard( );

// Copy data to clipboard
blnReturn = (SetClipboardDa ta(CF_HDROP, ipGlobal) !=
IntPtr.Zero);
if(!blnReturn)
Marshal.FreeHGl obal(ipGlobal);

// Clean up
CloseClipboard( );
// Clipboard responsible for freeing memory
// Marshal.FreeHGl obal(ipGlobal);

return blnReturn;
}

It's a different file format but the principle is similar.

--
Jeff Gaines Damerham Hampshire UK

[Jeff Gaines]

Re: Getting Clipboard Handle using GetClipboardDat a in C#

On Wed, 12 Nov 2003 02:25:33 -0800, "Roohi"
<angelic_soul_i n@hotmail.com> wrote:
[color=blue]
>hi
>
>I am trying to copy an image to a clipboard and then get a
>handle to the clipboard using API calls GetClipboardDat a().
>
>Following is the snippet of our code. Could any one please
>point out what am I missing here since I never get the
>handle to the object on clipboard
>
>
>hDib returned is always 0 where it actually had to return
>a handle to the clipboard;
>
>Thanks in Advance.
>
>~Roohi[/color]

Roohi

I am not sure now if my earlier post answers your question :-(

I have tried what you are doing - you must call open clipboard before
trying to get the handle to the data. Is the clipboard still open when
you make this call or have you already closed it?

--
Jeff Gaines Damerham Hampshire UK