Windows窗口的创建

#include <Windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain( 
    __in HINSTANCE hInstance, 
    __in_opt HINSTANCE hPrevInstance, 
    __in LPSTR lpCmdLine, 
    __in int nShowCmd 
    ) {
    TCHAR* appName = TEXT("Demo");
    HWND hwnd;
    MSG msg;
    WNDCLASS wndClass;
    wndClass.style = CS_HREDRAW | CS_VREDRAW;
    wndClass.lpfnWndProc = WndProc;
    wndClass.cbClsExtra = 0;
    wndClass.cbWndExtra = 0;
    wndClass.hInstance = hInstance;
    wndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndClass.lpszMenuName = NULL;
    wndClass.lpszClassName = appName;

    if(!RegisterClass(&wndClass)) {
        MessageBox(NULL, TEXT("Register Class Error"), appName, 0);
        return 0;
    }

    hwnd = CreateWindow(
        appName,
        TEXT("Demo"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT, 
        CW_USEDEFAULT, 
        NULL,
        NULL,
        hInstance, 
        NULL
    );

    ShowWindow(hwnd, nShowCmd);
    UpdateWindow(hwnd);

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

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    HDC hdc;
    PAINTSTRUCT ps;
    RECT rect;
    switch(msg) {
    case WM_CREATE:
        {
            return 0;
        }
    case WM_PAINT:
        {
            hdc = BeginPaint(hwnd, &ps);
            GetClientRect(hwnd, &rect);
            DrawText(hdc, TEXT("Ray_xujianguo"), -1, &rect, DT_SINGLELINE|DT_CENTER|DT_VCENTER);
            EndPaint(hwnd, &ps);
            return 0;
        }
    case WM_DESTROY:
        {
            PostQuitMessage(0);
            return 0;
        }
    }
    return DefWindowProc(hwnd, msg, wParam, lParam);
}

    LoadIcon                加载图标
    LoadCursor                加载鼠标光标
    GetStockObject            获取一个图形对象，本例子是获取一个画刷
    RegisterClass            注册一个窗口类
    MessageBox                消息框
    CreateWindow            创建一个窗口
    ShowWindow                显示窗口
    UpdateWindow            重绘窗口
    GetMessage                从消息队列中获取信息
    TranslateMessage        翻译键盘消息
    DispatchMessage            将消息转发给窗口
    BeginPaint                窗口开始绘制
    GetClientRect            获取窗口客户区的尺寸
    DrawText                显示一个文本字符串
    EndPaint                结束窗口的绘制
    PostQuitMessage            将”退出“消息插入消息队列中
    DefWindowProc            执行默认的消息处理

    前缀                        常量
    CS                        类风格选项
    CW                        创建窗口选项
    DT                        文本绘制选项
    IDI                        图标的ID号
    IDC                        光标的ID号
    MB                        消息框选项
    WM                        窗口消息
    WS                        窗口风格

    HINSTANCE                实例句柄-程序本身
    HWND                    窗口句柄
    HDC                        设备环境句柄