WIN32窗口程序

// Win32.cpp : 定义应用程序的入口点。
//

#include "stdafx.h"
#include "Win32.h"


void TRACE(LPCTSTR lpszFmt, ...);//调试信息
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);//消息处理函数 



int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPTSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
    //定义窗口类
    TCHAR *ClassName = _T("WIN32窗口程序");
    WNDCLASS wndclass = {0};
    wndclass.hbrBackground = (HBRUSH)COLOR_MENU;
    wndclass.lpfnWndProc = WindowProc;
    wndclass.lpszClassName = ClassName;
    wndclass.hInstance = hInstance;

    //注册窗口类
    RegisterClass(&wndclass);
    HWND hwnd = CreateWindow(
        ClassName,
        _T("第一个窗口"),
        WS_OVERLAPPEDWINDOW,
        100,
        100,
        600,
        400,
        NULL,
        NULL,
        hInstance,
        NULL
        );
    if (hwnd ==NULL)
    {
        return 0;
    }
    

    //显示窗口
    ShowWindow(hwnd, SW_SHOW);

    //消息循环
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);

    }

    //TRACE(_T("%d  %s"), 1243, a);


    return 0;
}

//调试信息输出
void TRACE(LPCTSTR lpszFmt, ...)
{
    va_list args;
    va_start(args, lpszFmt);
    int len = _vsctprintf(lpszFmt, args) + 1;
    TCHAR *lpszBuf = (TCHAR*)_alloca(len*sizeof(TCHAR));//栈中分配, 不需要释放
    _vstprintf_s(lpszBuf, len, lpszFmt, args);
    va_end(args);
    OutputDebugString(lpszBuf);
}
//消息回调函数
LRESULT CALLBACK WindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
    
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}