Win32最简单的程序

#include<tchar.h>
#include<stdio.h>
#include<windows.h>

LRESULT CALLBACK WinSunProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    WNDCLASS wndcls;
    wndcls.cbClsExtra = 0;
    wndcls.cbWndExtra = 0;
    wndcls.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
    wndcls.hCursor = LoadCursor(NULL,IDC_ARROW);
    wndcls.hIcon = LoadIcon(NULL,IDI_APPLICATION);
    wndcls.hInstance = hInstance;
    wndcls.lpfnWndProc = WinSunProc;
    wndcls.lpszClassName = _T("sunxin2006");
    wndcls.lpszMenuName = NULL;
    wndcls.style = CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&wndcls);

    HWND hwnd = CreateWindow(_T("sunxin2006"),_T("helloworld"),WS_OVERLAPPEDWINDOW,
        0,0,600,400,NULL,NULL,hInstance,NULL);
    ShowWindow(hwnd,SW_SHOW);
    UpdateWindow(hwnd);

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

VOID OnCreate(HWND hwnd,WPARAM wParam,LPARAM lParam)
{
    int scrWidth,scrHeight;
    RECT rect;
    //获得屏幕尺寸
    scrWidth = GetSystemMetrics(SM_CXSCREEN);
    scrHeight = GetSystemMetrics(SM_CYSCREEN);
    //取得窗口尺寸
    GetWindowRect(hwnd,&rect);
    //重新设置rect里的值
    rect.left = (scrWidth-rect.right)/2;
    rect.top = (scrHeight-rect.bottom)/2;
    //移动窗口到指定的位置
    SetWindowPos(hwnd,HWND_TOP,rect.left,rect.top,rect.right,rect.bottom,SWP_SHOWWINDOW);
}
LRESULT CALLBACK WinSunProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
    switch(uMsg)
    {
    case WM_CHAR:
        char szChar[20];
        sprintf_s(szChar,_T("char code is %d(%c)"),wParam,(char)(wParam));
        MessageBox(hwnd,szChar,_T("char"),0);
        break;
    case WM_LBUTTONDOWN:
        MessageBox(hwnd,_T("mouse clicked"),_T("mouse"),0);
        HDC hdc;
        hdc = GetDC(hwnd);
        TextOut(hdc,0,50,_T("程序员之家"),_tcslen(_T("程序员之家")));        ReleaseDC(hwnd,hdc);
        break;
    case WM_CREATE:
        OnCreate(hwnd,wParam,lParam);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd,uMsg,wParam,lParam);
    }
    return 0;
}

注意：需要设置多字符集，不然编译无法通过。在项目出右击属性。常规->字符集->选择多字符集。