How to insert into buffer?

Thread View: borland.public.cppbuilder.nativeapi

5 messages

[T] Back to Threads [V] Tree View [G] Group Articles

5 total messages Started by Jarkko Juntunen Thu, 08 May 2003 08:28

#16586

Author: Jarkko Juntunen
Date: Thu, 08 May 2003 08:28

43 lines
1934 bytes

Hi!

I have next chunk of code (mostly from MSDN web-page):

error = WNetAddConnection2(&nr, cPass, cUser, NULL);
    if(error)
    {
      LPVOID lpMsgBuf;

      if (!FormatMessage(
          FORMAT_MESSAGE_ALLOCATE_BUFFER |
          FORMAT_MESSAGE_FROM_SYSTEM |
          FORMAT_MESSAGE_IGNORE_INSERTS,
          NULL,
          GetLastError(),
          MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
          (LPTSTR) &lpMsgBuf,
          0,
          NULL ))
      {
         // Handle the error.
         return;
      }

      // Process any inserts in lpMsgBuf.
      // ...

    	
      // Display the string.
      MessageBox( NULL, (LPCTSTR)lpMsgBuf, "Error", MB_OK | 
MB_ICONINFORMATION );

      // Free the buffer.
      LocalFree( lpMsgBuf );
    }

And that works just fine. But I'd like to insert something into begining of 
my lpMsgBuffer. So the error message will be something like "Can't connect 
:" lpMsgBuf;

But I don't know how to do that. Any suggestions?

Thanks!

Re: How to insert into buffer?

#16587

Author: Vladimir Afanasyev
Date: Thu, 08 May 2003 09:07

8 lines
1166 bytes

it is also possible:

	
      // Display the string.      
MessageBox( NULL, (AnsiString("Can't connect: ")+(LPCTSTR)lpMsgBuf).c_str(), "Error", MB_OK | MB_ICONINFORMATION );

Vladimir.

Re: How to insert into buffer?

#16588

Author: hans galema
Date: Thu, 08 May 2003 09:11

12 lines
1476 bytes

Jarkko Juntunen wrote:

>       // Display the string.
>       MessageBox( NULL, (LPCTSTR)lpMsgBuf, "Error", MB_OK | 
> MB_ICONINFORMATION );

        AnsiString Message = "Can't connect: " + AnsiString ( lpMsgBuf );

        MessageBox( NULL, Message.c_str(), "Error", MB_OK |
	 MB_ICONINFORMATION );

Hans.

Re: How to insert into buffer?

#16602

Author: Remy Lebeau (TeamB)
Date: Thu, 08 May 2003 17:01

28 lines
2026 bytes

"Jarkko Juntunen" <dzeidzei@suolakaivos.com> wrote in message
news:Xns937574BE25A36dzeidzeisuolakaivosc@207.105.83.65...

> I'd like to insert something into begining of my lpMsgBuffer.

You can't insert into lpMsgBuffer directly.  You would have to allocate a
second buffer, put "Can't Connect:" into it first, then copy the contents
lpMsgBuffer into the second buffer afterwards, ie:

    // "Can't Connect: " + lpMsgBuf + extra padding
    int len = lstrlen((LPCTSTR)lpMsgBuf) + 20;

    lpMyBuffer = (LPTSTR) GlobalAlloc(GPTR, len * sizeof(TCHAR));

    lstrcpy(lpMyBuffer, TEXT("Can't Connect: "));
    lstrcat(lpMyBuffer, (LPCTSTR)lpMsgBuf);

    MessageBox( NULL, lpMyBuffer, "Error", MB_OK | MB_ICONINFORMATION );
    GlobalFree(lpMyBuffer);

Or, just use the VCL and AnsiString:

    AnsiString Msg = "Can't Connect: " + SysErrorMessage(GetLastError());
    MessageBox( NULL, Msg.c_str(), "Error", MB_OK | MB_ICONINFORMATION );


Gambit

Re: How to insert into buffer?

#16604

Author: Jarkko Juntunen
Date: Thu, 08 May 2003 19:48

3 lines
944 bytes

Thaks again to all of You! Now it's working.
-- 
-jii

Thread Navigation

This is a paginated view of messages in the thread with full content displayed inline.

Messages are displayed in chronological order, with the original post highlighted in green.

Use pagination controls to navigate through all messages in large threads.

Back to All Threads