RE: MS Visual C++

["Schar, Thomas" <Thomas.Schar@dsto.defence.gov.au>]

Hiya Josiah,

Simple typo. You've specified a forward declaration of

LRESULT APIENTRY WndProc(HWND,UINT,WPARAM,LPARAM);

And then you haven't defined it, which is not the bad thing;  the bad thing
is that you then tried to make use of it in, WinMain, like this,

	win.lpfnWndProc   = (WNDPROC)WndProc;

I think if you change the name of 

LRESULT APIENTRY WinProc(HWND handle, UINT message,WPARAM data1,LPARAM 
data2)

defined later in the program to WndProc (or vice versa), you'll have a lot
more joy.

Good luck
Thomas.
____________________________________________________
Thomas R. Schar (Professional Officer)
Trusted Computer Systems/Information Technology Division/DSTO/Australia
Tel: +61-08-8259 6445;  Fax: +61-08-8259 5980;  Mob: +61-0412-310647
Email: mailto://thomas.schar@dsto.defence.gov.au

 -----Original Message-----
From: 	Josiah Avery [mailto:josiahavery@hotmail.com] 
Sent:	Friday, 17 March 2000 6:30 AM
To:	gameprogrammer@gameprogrammer.com
Subject:	Re: MS Visual C++

Hello all,

I am trying to get this simple application going but am getting the 
following two link errors:

souce.obj : error LNK2001: unresolved external symbol "long __stdcall 
WndProc(struct HWND__ *,unsigned int,unsigned int,long)" 
(?WndProc@@YGJPAUHWND__@@IIJ@Z)

Debug/window.exe : fatal error LNK1120: 1 unresolved externals

The listing is as such:

#include <windows.h>

typedef LPCTSTR WIN_STRING;
WIN_STRING className = "Sample Win98 application";
WIN_STRING menuName  = "Sample Win98 application, dev by l0w_karma";

LRESULT APIENTRY WndProc(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(HINSTANCE thisInstance, HINSTANCE prevInstnce, LPSTR 
commandArg, int winArg)
{
	HWND winHand = NULL;
	MSG message;
    WNDCLASS win;

	win.lpszClassName = className;
	win.lpszMenuName  = className;
	win.lpfnWndProc   = (WNDPROC)WndProc;
	win.hInstance     = thisInstance;
	win.style         = CS_HREDRAW|CS_VREDRAW;
	win.hIcon          = LoadIcon(thisInstance,className);
	win.cbClsExtra     = 0;
	win.cbWndExtra     = 0;
	win.hCursor        = LoadCursor(NULL,IDC_ARROW);
	win.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);

    if(!RegisterClass(&win))
		return FALSE;

    winHand = 
CreateWindow(className,menuName,WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFA
ULT,640,480,winHand,NULL,thisInstance,NULL);

	if(!winHand)
		return FALSE;

	ShowWindow(winHand,winArg);
	UpdateWindow(winHand);

    while(GetMessage(&message,NULL,0,0))
	{
		TranslateMessage(&message);
		DispatchMessage(&message);
	}

    return TRUE;

}

LRESULT APIENTRY WinProc(HWND handle, UINT message,WPARAM data1,LPARAM 
data2)
{
	HDC hdc;
	PAINTSTRUCT paint;

	switch(message)
	{
	   case WM_PAINT:
		   hdc = BeginPaint(handle,&paint);
		   EndPaint(handle,&paint);
		   return 0;

	   case WM_DESTROY:
			   PostQuitMessage(0);
     		   break;
	}

return DefWindowProc(handle,message,data1,data2);
}


*** thanks in advance for any help.

Josiah Avery
aka l0w_karma






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