Question

How to create a blank Win32 window in C Win32 API

Answer 1

#include <Windows.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE prevInstance, LPWSTR cmdLine, int cmdShow)
{
	UNREFERENCED_PARAMETER(prevInstance);
	UNREFERENCED_PARAMETER(cmdLine);

	WNDCLASSEX wndClass = { 0 };
	wndClass.cbSize = sizeof(WNDCLASSEX);
	wndClass.style = CS_HREDRAW | CS_VREDRAW;
	wndClass.lpfnWndProc = WndProc;
	wndClass.hInstance = hInstance;
	wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
	wndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wndClass.lpszMenuName = NULL;
	wndClass.lpszClassName = "BlankWin32Window";

	if (!RegisterClassEx(&wndClass))
		return -1;
	
	RECT rc = { 0, 0, 800, 600 };
	AdjustWindowRect(&rc, WS_OVERLAPPEDWINDOW, FALSE);

	HWND hwnd = CreateWindowA("BlankWin32Window", "Blank Win32 Window",
		WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, rc.right - rc.left,
		rc.bottom - rc.top, NULL, NULL, hInstance, NULL);

	if (!hwnd)
		return -1;

	ShowWindow(hwnd, cmdShow);

	MSG msg = { 0 };
	while (msg.message != WM_QUIT)
	{
		if (PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}
	return 0;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	PAINTSTRUCT paintStruct;
	HDC hDC;

	switch (message)
	{
		case WM_PAINT:
			hDC = BeginPaint(hwnd, &paintStruct);
			EndPaint(hwnd, &paintStruct);
			break;
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
		default:
			return DefWindowProc(hwnd, message, wParam, lParam);
	}
	return 0;
}

 

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