win32SDK窗口程序

#pragma once
#include <windows.h>
#include <tchar.h>

//窗口回调
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);

//创建事件
bool OnCreate(HWND hwnd);

TCHAR szWindowClass[]=TEXT("哈哈");

int APIENTRY _tWinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPTSTR lpCmdLine,int nCmdShow)
{
	WNDCLASSEX wcex={0};
	wcex.cbSize = sizeof(WNDCLASSEX);
	wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	= WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= LoadIcon(NULL, MAKEINTRESOURCE(IDI_APPLICATION));
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);
	wcex.lpszMenuName	= NULL;
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= LoadIcon(NULL, MAKEINTRESOURCE(IDI_APPLICATION));
	RegisterClassEx(&wcex);

	HWND hWnd;
	hWnd = CreateWindow(szWindowClass, TEXT("标题"), WS_OVERLAPPEDWINDOW,0, 0, 600, 400, NULL, NULL, hInstance, NULL);
	if (!hWnd)return FALSE;

	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);

	MSG msg={0};
	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return (int) msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;

	switch (message)
	{
	case WM_CREATE:
			OnCreate(hWnd);break;
	case WM_COMMAND:
		{
			wmId    = LOWORD(wParam);
			wmEvent = HIWORD(wParam);
			// 分析菜单选择:
			switch (wmId)
			{
			case IDOK:break;
			default:
				return DefWindowProc(hWnd, message, wParam, lParam);
			}
		}
		break;
	case WM_PAINT:
		{
			hdc = BeginPaint(hWnd, &ps);
			// TODO: 在此添加任意绘图代码...
			EndPaint(hWnd, &ps);
		}
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}

bool OnCreate(HWND hwnd)
{
	//窗口居中
	int x=GetSystemMetrics(SM_CXSCREEN);
	int y=GetSystemMetrics(SM_CYSCREEN);

	RECT WindowRect;
	GetWindowRect(hwnd,&WindowRect);
	int cx=(x-WindowRect.right)/2;
	int cy=(y-WindowRect.bottom)/2;
	SetWindowPos(hwnd,NULL,cx,cy,NULL,NULL,SWP_SHOWWINDOW|SWP_NOSIZE);
	return true;
}