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Tip of the Day
Language: C
Expertise: Advanced
Jul 29, 2008

Calling C Libraries from .NET

Suppose your library is in C and and your code is in .NET or VC++ (for a UI-based application). Further, suppose you want to display a message box whenever the library raises any error. In that situation, the following code is useful:

#include <stdio.h>
HWND g_AdtDlgWnd = NULL;
void UserWarning(char* arg1,char* arg2, ...)
{
	va_list list;
	char Buffer[1024];
	int ret;

	va_start(list,arg2);
	ret=vsprintf(Buffer,arg2,list);
	va_end(list);
	{
		HWND hwnd_cur=GetFocus();
		if(hwnd_cur == NULL)
		{
		hwnd_cur = GetADTDialogWindow();//Find handle of dlg
		}
		MessageBox(hwnd_cur,Buffer,arg1,MB_OK);
	}
}

HWND GetADTDialogWindow(void)
{
	if(g_AdtDlgWnd == NULL)
	return FindWindow(NULL,ADT_TITLE);//Provide title 
// of window (Dialog)
	else
		return g_AdtDlgWnd;
}
Now, call the function:

UserWarning("Data Transfer","Data not saved on server side");
Saroj Kabra
 
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