16.消息类型

Notes #滴水基础_Win32

消息的产生与处理流程

截图 202607281947

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#include "framework.h"
#include "Win32.h"



LRESULT CALLBACK WindowsProc(
	HWND hwnd,
	UINT uMsg,
	WPARAM wParam,
	LPARAM rParam
) {
	char szOutBuff[0x80];
	wsprintfA(szOutBuff, "消息类型: %lx\n", uMsg);
	OutputDebugStringA(szOutBuff);
	switch (uMsg) {
		case WM_DESTROY:
			PostQuitMessage(0);
			return 0;
		case WM_CHAR:
			char charBuf[16] = { 0 };
			wsprintfA(charBuf, "按下: %c", (char)wParam);
			MessageBoxA(hwnd, charBuf, "按键提示", MB_OK | MB_ICONINFORMATION);
			return 0;
	
	}


	return DefWindowProc(hwnd, uMsg,wParam,rParam);
}


int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPWSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
     
	//DWORD  dwAddr = (DWORD)hInstance;
	char szOutBuff[80];
	
	//1.定义你的窗口是怎么样的
	WNDCLASS wndclass = { 0 };
	TCHAR szAppName[] = TEXT("MyApp");
	wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wndclass.lpszClassName = szAppName;
	wndclass.hInstance = hInstance;
	wndclass.lpfnWndProc = WindowsProc;
	RegisterClass(&wndclass);

	//2.创建并显示窗口
	HWND hwnd = CreateWindow(szAppName,TEXT("Hello"),WS_OVERLAPPEDWINDOW,10,10,600,300,NULL,NULL,hInstance,NULL);
	if (hwnd == NULL) {
		wsprintfA(szOutBuff, "Error: %d\n", GetLastError());
		OutputDebugStringA(szOutBuff);
		return 0;
	}

	ShowWindow(hwnd, SW_SHOW);

	//3.接收并处理消息
	MSG msg;
	BOOL bRet;
	while ((bRet = GetMessage(&msg, NULL, 0, 0)) != 0) {
		if (bRet == -1)
		{
			wsprintfA(szOutBuff, "Error: %d\n", GetLastError());
			OutputDebugStringA(szOutBuff);
		}
		else {
			//转换消息
			TranslateMessage(&msg);
			//分发消息
			DispatchMessageW(&msg);
		}
	}

    return 0;
}

关于本文

由 GuQing 撰写，采用 CC BY-NC 4.0 许可协议。