Unmanaged TYpes in API

[Howard Kaikow]

The FormatMessage API is specified as:

DWORD FormatMessage(
DWORD dwFlags,
LPCVOID lpSource,
DWORD dwMessageId,
DWORD dwLanguageId,
LPTSTR lpBuffer,
DWORD nSize,
va_list* Arguments)

I am trying to convert this to C#. So far I've got:

[System.Runtime. InteropServices .DllImport("ker nel32",
EntryPoint="For matMessage", ExactSpelling=f alse,
CharSet=System. Runtime.Interop Services.CharSe t.Ansi, SetLastError=tr ue)]
private static extern uint FormatMessage (
uint dwFlags,
lpcvoid lpSource,
uint dwMessageId, uint dwLanguageId,
[MarshalAs(Unman agedType.LPTStr )]string lpBuffer,
uint nSize,
va_list* Arguments);

Did I do LPTSTR correctly?
What do I need to do for LPCVOID and va_list*?

[Willy Denoyette [MVP]]

Re: Unmanaged TYpes in API


"Howard Kaikow" <kaikow@standar ds.com> wrote in message
news:Ob8sBtDaFH A.1384@TK2MSFTN GP09.phx.gbl...[color=blue]
> The FormatMessage API is specified as:
>
> DWORD FormatMessage(
> DWORD dwFlags,
> LPCVOID lpSource,
> DWORD dwMessageId,
> DWORD dwLanguageId,
> LPTSTR lpBuffer,
> DWORD nSize,
> va_list* Arguments)
>
> I am trying to convert this to C#. So far I've got:
>
> [System.Runtime. InteropServices .DllImport("ker nel32",
> EntryPoint="For matMessage", ExactSpelling=f alse,
> CharSet=System. Runtime.Interop Services.CharSe t.Ansi, SetLastError=tr ue)]
> private static extern uint FormatMessage (
> uint dwFlags,
> lpcvoid lpSource,
> uint dwMessageId, uint dwLanguageId,
> [MarshalAs(Unman agedType.LPTStr )]string lpBuffer,
> uint nSize,
> va_list* Arguments);
>
> Did I do LPTSTR correctly?
> What do I need to do for LPCVOID and va_list*?
>
>[/color]
Try this...
[DllImport("kern el32.dll", CharSet=CharSet .Auto, SetLastError=tr ue)]
internal static extern int FormatMessage
(int dwFlags,
IntPtr lpSource,
int dwMessageId,
int dwLanguageId,
StringBuilder lpBuffer,
int nSize,
IntPtr va_list_argumen ts);

Willy.

[Howard Kaikow]

Re: Unmanaged TYpes in API

Thanx, I'll give it a try.

--
http://www.standards.com/; See Howard Kaikow's web site.
"Willy Denoyette [MVP]" <willy.denoyett e@telenet.be> wrote in message
news:Ob4AeLFaFH A.2884@tk2msftn gp13.phx.gbl...[color=blue]
>
> "Howard Kaikow" <kaikow@standar ds.com> wrote in message
> news:Ob8sBtDaFH A.1384@TK2MSFTN GP09.phx.gbl...[color=green]
> > The FormatMessage API is specified as:
> >
> > DWORD FormatMessage(
> > DWORD dwFlags,
> > LPCVOID lpSource,
> > DWORD dwMessageId,
> > DWORD dwLanguageId,
> > LPTSTR lpBuffer,
> > DWORD nSize,
> > va_list* Arguments)
> >
> > I am trying to convert this to C#. So far I've got:
> >
> > [System.Runtime. InteropServices .DllImport("ker nel32",
> > EntryPoint="For matMessage", ExactSpelling=f alse,
> > CharSet=System. Runtime.Interop Services.CharSe t.Ansi, SetLastError=tr ue)]
> > private static extern uint FormatMessage (
> > uint dwFlags,
> > lpcvoid lpSource,
> > uint dwMessageId, uint dwLanguageId,
> > [MarshalAs(Unman agedType.LPTStr )]string lpBuffer,
> > uint nSize,
> > va_list* Arguments);
> >
> > Did I do LPTSTR correctly?
> > What do I need to do for LPCVOID and va_list*?
> >
> >[/color]
> Try this...
> [DllImport("kern el32.dll", CharSet=CharSet .Auto, SetLastError=tr ue)]
> internal static extern int FormatMessage
> (int dwFlags,
> IntPtr lpSource,
> int dwMessageId,
> int dwLanguageId,
> StringBuilder lpBuffer,
> int nSize,
> IntPtr va_list_argumen ts);
>
> Willy.
>
>
>[/color]