WIN32 Help

I try to compile the following code and it has an error with this part

Code:

if (!(hwnd = CreateWindowEx(NULL, // extended style
                            WINDOW_CLASS_NAME,   // class
						    "Your Basic Window", // title
						    WS_OVERLAPPEDWINDOW | WS_VISIBLE,
					 	    0,0,	    // initial x,y
						    400,400,  // initial width, height
						    NULL,	    // handle to parent 
						    NULL,	    // handle to menu
						    hinstance,// instance of this application
						    NULL)))	// extra creation parms ****THIS IS WERE THE ERROR IS****

it says

Code:

warning: trying to convert NULL to a non-ponter type.

You should be able to ignore that *warning*. Check to see if your program compiled...

nope didn't compile

BUMP



If you need me to I"ll post the full code.




~Trooper

You are using CreateWindowEX() which allows extended windows styles then you don't specify an extended style. Use CreateWindow() or

Try

CreateWindowEx( WS_EX_APPWINDOW,

okay I tried that now i get this error

Code:

function `int WinMain(HINSTANCE__ *, HINSTANCE__ *, CHAR *, int)':
 `WINDOW_CLASS_NAME' undeclared (first use this function)
 (Each undeclared identifier is reported only once
 for each function it appears in.)
 type `const WNDCLASSA' is not a base type for type `WNDCLASSEX'
 warning: converting NULL to non-pointer type

here is the full code if your bored...

Code:

// Define //////////////////////////////////////////////////////////////////////
#define WIN32_LEAN_AND_MEAN //no MFC
#define WINDOWS_CLASS_NAME "WINCLASS1"


// Include Files///////////////////////////////////////////////////////////////
#include <windows.h>  //The main Window
#include <windowsx.h> //Macros
#include <stdio.h>
#include <math.h>

// Global Varables ////////////////////////////////////////////////////////////

// Main Window ////////////////////////////////////////////////////////////////
LRESULT CALLBACK WindowProc(HWND hwnd, 
						    UINT msg, 
                            WPARAM wparam, 
                            LPARAM lparam)
{
// this is the main message handler of the system
PAINTSTRUCT	ps;	// used in WM_PAINT
HDC	hdc;	// handle to a device context

// what is the message 
switch(msg)
	{	
	case WM_CREATE: 
        {
		// do initialization stuff here

        // return success
		return(0);
		} break;

	case WM_PAINT: 
		{
		// simply validate the window
		hdc = BeginPaint(hwnd,&ps);	 
		// you would do all your painting here
        EndPaint(hwnd,&ps);

        // return success
		return(0);
   		} break;

	case WM_DESTROY: 
		{
		// kill the application, this sends a WM_QUIT message 
		PostQuitMessage(0);

        // return success
		return(0);
		} break;

	default:break;

    } // end switch

// process any messages that we didn't take care of 
return (DefWindowProc(hwnd, msg, wparam, lparam));

} // end WinProc

// WINMAIN ////////////////////////////////////////////////
int WINAPI WinMain(	HINSTANCE hinstance,
					HINSTANCE hprevinstance,
					LPSTR lpcmdline,
					int ncmdshow)
{

WNDCLASSEX winclass; // this will hold the class we create
HWND	   hwnd;	 // generic window handle
MSG		   msg;		 // generic message

// first fill in the window class stucture
winclass.cbSize         = sizeof(WNDCLASSEX);
winclass.style			= CS_DBLCLKS | CS_OWNDC | 
                          CS_HREDRAW | CS_VREDRAW;
winclass.lpfnWndProc	= WindowProc;
winclass.cbClsExtra		= 0;
winclass.cbWndExtra		= 0;
winclass.hInstance		= hinstance;
winclass.hIcon			= LoadIcon(NULL, IDI_APPLICATION);
winclass.hCursor		= LoadCursor(NULL, IDC_ARROW);
winclass.hbrBackground	= (HBRUSH)GetStockObject(BLACK_BRUSH);
winclass.lpszMenuName	= NULL;
winclass.lpszClassName	= WINDOW_CLASS_NAME;
winclass.hIconSm        = LoadIcon(NULL, IDI_APPLICATION);

// register the window class
if (!RegisterClass(&winclass))
	return(0);

// create the window
if (!(hwnd = CreateWindowEx(NULL, // extended style
                            WINDOW_CLASS_NAME,   // class
						    "Your Basic Window", // title
						    WS_OVERLAPPEDWINDOW | WS_VISIBLE,
					 	    0,0,	    // initial x,y
						    400,400,  // initial width, height
						    NULL,	    // handle to parent 
						    NULL,	    // handle to menu
						    hinstance,// instance of this application
						    NULL)))	// extra creation parms
return(0);

// enter main event loop
while(GetMessage(&msg,NULL,0,0))
 	 { 
	 // translate any accelerator keys
	 TranslateMessage(&msg);

	 // send the message to the window proc
	 DispatchMessage(&msg);
	 } // end while

// return to Windows like this
return(msg.wParam);

} // end WinMain

~Trooper

Just use your original code. However, CreateWindowEx takes a DWORD as its first argument and not a pointer so use 0 instead of NULL.

Code:

if (!(hwnd = CreateWindowEx(NULL, // wrong!
if (!(hwnd = CreateWindowEx(0,       // right!

Also use RegisterClassEx in place of RegisterClass.

EDIT: Change the define from WINDOWS_CLASS_NAME to WINDOW_CLASS_NAME so that it matches your other code.

Wow, Thanks a lot. 1 more thing I get this error

Code:

 undefined reference to `GetStockObject@4'

weird error huh.



~Trooper


Thanks a lot.

This is a linker error that means the function can not be found. If you look at the bottom of the GetStoickObject doc page you find:

Library: Use Gdi32.lib.

So try linking with gdi32.lib.

umm how would I go about doing that in Dev-C++?



~Trooper

BUMP



Please help me I can't get this figured out.



~Trooper

Project -> Project Options -> Parameters Tab

Under Linker,

add this line
-lgdi32

Also make sure you're compiling a GUI project on Dev-C++:

Project -> Project Options

On the General tab, make sure the type is WIN32 GUI.

Yeehaw!!! Thanks sooooooo much.



~Trooper