<04>自定义消息

#include <tchar.h>
#include <Windows.h>


//自定义消息
#define WM_MYMSG WM_USER + 1


//7.消息处理
LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
TCHAR Text[100];
switch (msg)
{
case WM_MYMSG: //处理自定义消息
wsprintf(Text, L"自定义消息");
MessageBox(NULL, Text, L"MyMSG", MB_OK);
break;
case WM_LBUTTONDOWN:
wsprintf(Text, L"x:%d, y:%d", LOWORD(lParam), HIWORD(lParam));
MessageBox(NULL, Text, L"Pos", MB_OK);
break;
case WM_RBUTTONDOWN://点击鼠标左键时发射自定义消息
PostMessage(hWnd, WM_MYMSG, wParam, lParam);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
}
return DefWindowProc(hWnd, msg, wParam, lParam);
}


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
//1.描述窗口类
WNDCLASS wnd;
wnd.style         = CS_HREDRAW | CS_VREDRAW;
wnd.lpfnWndProc   = WndProc;
wnd.cbClsExtra    = NULL;
wnd.cbWndExtra    = NULL;
wnd.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
wnd.hCursor       = LoadCursor(NULL, IDC_CROSS);
wnd.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wnd.lpszMenuName  = NULL;
wnd.lpszClassName = TEXT("MainWindow");
wnd.hInstance     = hInstance;




//2.注册窗口类
if (!RegisterClass(&wnd))
{
MessageBox(NULL, TEXT("Register fail"), TEXT("Error"), MB_OK);
return -1;
}
//3.创建窗口
HWND hWnd = CreateWindow(TEXT("MainWindow"), TEXT("MainWindow"), WS_OVERLAPPEDWINDOW, 0, 0, 400, 300, NULL, NULL, hInstance, NULL);


//4.显示窗口
ShowWindow(hWnd, nShowCmd);


//5.更新窗口
UpdateWindow(hWnd);


//6.消息循环
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}


//自定消息
//1.声明消息
//2.发送消息
//3.处理消息