please look at this simple code!

[abdul]

Ok I quit programming for one month and now i started again so here i wrote my empty window program:

#include <windows.h>
LRESULT CALLBACK WndProc(HWND hwnd, UINT imsg, WPARAM wparam, LPARAM lparam)
{
	switch(imsg)
	{
	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	}
		return DefWindowProc(hwnd, imsg, wparam, lparam);
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
	WNDCLASSEX wc;
    MSG msg;
	HWND winhwnd;
	wc.cbSize = sizeof(WNDCLASSEX);
	wc.style = CS_HREDRAW | CS_VREDRAW;
	wc.lpfnWndProc = WndProc;
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = hInstance;
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hbrBackground = (HBRUSH)GetStockObject(LTGRAY_BRUSH);
	wc.lpszMenuName = NULL;
	wc.lpszClassName = "mycalss";
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

	if(!RegisterClassEx(&wc))
	{
		MessageBox(NULL, "Error in Class Registeration", "Error", MB_OK);
		return 0;
	}
	winhwnd = CreateWindow("myclass", "the title", WS_OVERLAPPEDWINDOW,
		0,0,34,34,NULL,NULL,hInstance,NULL);
	if(winhwnd == NULL)
	{
		MessageBox(NULL, "Error Creating Hwnd", "Error", MB_OK);
		return 0;
	}
	ShowWindow(winhwnd, nShowCmd);
	while(GetMessage(&msg, NULL, 0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return msg.wParam;
}

Can you please get the error in there because when i run the program, it give me the messagebox saying "Error Creating Hwnd".
Thanks!

[Amon Ra]

Here:

wc.lpszClassName = "mycalss";

That is what the classname is, and here:

winhwnd = CreateWindow("myclass", "the title", WS_OVERLAPPEDWINDOW,
		0,0,34,34,NULL,NULL,hInstance,NULL);

the classnames are different. i changed them, and it worked

[Amon Ra]

just make them the same

[abdul]

I did not get that. How come the class name "myclass" was different in the class and hwnd. I used the same name!
And here is a kind of new version of that. It gives the same error!

#include <windows.h>
LRESULT CALLBACK WndProc(HWND hwnd, UINT imsg, WPARAM wparam, LPARAM lparam)
{
	switch(imsg)
	{
	case WM_CLOSE:
		DestroyWindow(hwnd);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hwnd, imsg, wparam, lparam);
	}
	return 0;
	}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
	WNDCLASSEX wc;
    MSG msg;
	HWND winhwnd;

	wc.cbSize = sizeof(WNDCLASSEX);
	wc.style = 0;
	wc.lpfnWndProc = WndProc;
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = hInstance;
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hbrBackground = (HBRUSH)GetStockObject(LTGRAY_BRUSH);
	wc.lpszMenuName = NULL;
	wc.lpszClassName = "mycalss";
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

	if(!RegisterClassEx(&wc))
	{
		MessageBox(NULL, "Error in Class Registeration", "Error", MB_OK);
		return 0;
	}
	winhwnd = CreateWindowEx(
		WS_EX_CLIENTEDGE, 
		"myclass", 
		"the title", 
		WS_OVERLAPPEDWINDOW,
		0,
		0,
		340,
		304,
		NULL,
		NULL,
		hInstance,
		NULL);
	if(winhwnd == NULL)
	{
		MessageBox(NULL, "Error in hwnd Registeration", "Error", MB_OK);
		return 0;
	}
	ShowWindow(winhwnd, nShowCmd);
	UpdateWindow(winhwnd);
	while(GetMessage(&msg, NULL, 0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return msg.wParam;
}

Please tell me the exact error!

[Amon Ra]

One of them is "mycalss" and the other is "myclass". Spelling mistake

[abdul]

Oh yes i got that the class names were like that

mycalss
myclass


May I was sleeping at that time!

THanks a lot buddy

[Amon Ra]

No prob... C++ is so much fun, but sometimes, small stuff like that can....(you know what i mean) LOL
PS: Did you take a look at my "windows" thread thanks