creating windows

[thefatshizms]

Hello, I've been looking at making windows, but I don't understand it fully. Is there some tutorial on youtube / this forum ( I have searched) or yourself that can explain every line to me?

[SpaceWorm]

Hi,

There are plenty of resources available on internet related to GUI programming a prime and great example would be :[i]"forgers WinAPI"[/o]

Link: http://www.winprog.org/tutorial/

Sorry, but I am not going to give source code because it is all in the Link given.

Good Luck!

[thefatshizms]

I don't understand this:

WNDCLASSEX wc;
    HWND hwnd;
    MSG Msg;

How can this set the windows stuff when it's not passed through the function? Wouldn't it value to 0? and only make the window 0 (if you have more than one window it would only make the first one)?


EDIT: HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam
I also don't understand the LPAram etc

[thefatshizms]

Did this (Tried to re write the code to understand it)

#include <Windows.h>

//global class name
const char WindowC[] = "WindowsClass";


//this handles everything you do to the window (clicking etc)
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	switch(msg) {

		//skype is a fegget
		case WM_CLOSE: MessageBox(NULL, "NO!", NULL, NULL);

	}

	return 0;
}

//the main function
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	WNDCLASSEX window;//object
	HWND hwnd;//the handle
	MSG msg;//the message

	window.cbSize        = sizeof(WNDCLASSEX);
    window.style         = 0;
    window.lpfnWndProc   = WndProc;
    window.cbClsExtra    = 0;
    window.cbWndExtra    = 0;
    window.hInstance     = hInstance;
    window.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
    window.hCursor       = LoadCursor(NULL, IDC_ARROW);
    window.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    window.lpszMenuName  = NULL;
    window.lpszClassName = WindowC;
    window.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

	if(!RegisterClassEx(&window))
    {
        MessageBox(NULL, "Window Registration Failed!", "Error!",
            MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

	hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, WindowC, "Hello", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 500, 500, NULL, NULL, hInstance, NULL);

	ShowWindow(hwnd, nCmdShow);
	UpdateWindow(hwnd);

	if(hwnd == NULL)
    {
        MessageBox(NULL, "Window Creation Failed!", "Error!",
            MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }


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

	return msg.wParam;
}

But it always says window creation failed.

[freddie1]

SpaceWorm gave you good advice. If you followed it, you would understand why your window creation is failing.