119.WIN32窗口原理

#include <Windows.h> //处理消息的回调函数
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hpreinstance, PSTR szcmdline, int icmdshow)
{
//设置窗口的名字
static TCHAR szappname[] = TEXT("mywindow"); //窗口类
WNDCLASS wndclass;
//风格
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpszClassName = szappname;//设置名字
wndclass.lpszMenuName = NULL;
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);//设置背景
wndclass.lpfnWndProc = WndProc;//设置回调函数处理窗口
wndclass.cbClsExtra = wndclass.cbWndExtra = ;//拓展
wndclass.hInstance = hinstance;//窗口句柄
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);//载入图标
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);//载入鼠标风格 //通过名字,注册窗口
if (!RegisterClass(&wndclass))
{
MessageBoxA(, "窗口注册失败", "提示", );
return ;
} //通过名字,创建窗口
HWND hwnd = CreateWindow(szappname,//窗口名字
TEXT("窗口"),//窗口标题
WS_OVERLAPPEDWINDOW,//窗口风格
CW_USEDEFAULT,//默认显示位置x
CW_USEDEFAULT,//默认显示位置y
CW_USEDEFAULT,//默认宽度
CW_USEDEFAULT,//默认高度
NULL,//子窗口
NULL,//子菜单
hinstance,//窗口句柄
NULL); ShowWindow(hwnd, SW_SHOW);
UpdateWindow(hwnd);//显示并更新
MSG msg;//消息
//消息循环(GetMessage 创建事件 TranslateMessage DispatchMessage响应事件)
while (GetMessage(&msg,NULL,,))
{
TranslateMessage(&msg);
//调用回调函数
DispatchMessage(&msg);
} return msg.wParam;
} LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
{
//设备环境
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
switch (message)
{
case WM_LBUTTONDOWN:
MessageBoxA(, "按下鼠标左键", "提示", );
break;
case WM_RBUTTONDOWN:
MessageBoxA(, "按下鼠标左键", "提示", );
break;
case WM_CLOSE:
if (MessageBoxA(, "是否关闭窗口", "提示", ) == )
{
//关闭窗口,发送WM_DESTROY消息
DestroyWindow(hwnd);
}
else
{
return ;
}
break;
case WM_DESTROY:
MessageBoxA(, "已成功关闭", "提示", );
exit();
break;
default:
break;
}
return DefWindowProc(hwnd, message, wparam, lparam);
}