Windows消息运行机制

 Windows内部运行机制，一直是有个大略的了解，主要是了解了这几个方面：

一、Windows窗口的设计、注册、创建、显示更新；

二、消息循环；了解windows消息的基本情况，还是要把代码敲一下，有个初步的肌肤之亲。

 

#include <windows.h>#include <stdio.h>LRESULT CALLBACK WinTianProc(HWND hwnd, UINT uMsg, WPARAM wparam, LPARAM lparam);int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd ){WNDCLASS wndclass;wndclass.cbClsExtra = 0;wndclass.cbWndExtra = 0;wndclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);wndclass.hCursor = LoadCursor(NULL,IDC_CROSS);wndclass.hIcon = LoadIcon(NULL,IDI_ERROR);wndclass.hInstance = hInstance;wndclass.lpfnWndProc = WinTianProc;wndclass.lpszClassName = "tian";wndclass.lpszMenuName = NULL;wndclass.style = CS_HREDRAW | CS_VREDRAW;RegisterClass(&wndclass);HWND hwnd;hwnd = CreateWindow("tian","abc",WS_OVERLAPPEDWINDOW,0,0,600,400,NULL,NULL,hInstance,NULL);ShowWindow(hwnd,SW_SHOWNORMAL);UpdateWindow(hwnd);BOOL bRet;MSG msg;while(bRet = GetMessage(&msg,NULL,0,0)){if (-1 == bRet){break;}else{TranslateMessage(&msg);DispatchMessage(&msg);}}return msg.wParam;}LRESULT CALLBACK WinTianProc(HWND hwnd, UINT uMsg, WPARAM wparam, LPARAM lparam){switch (uMsg){case WM_CHAR:char szChar[20];sprintf(szChar,"char code is %d",wparam);MessageBox(hwnd,szChar,"char",0);break;case WM_LBUTTONDOWN:MessageBox(hwnd,"mouse clicked","message",0);HDC hdc;hdc = GetDC(hwnd);TextOut(hdc,0,9,"程序员之家",strlen("程序员之家"));break;case WM_PAINT:HDC hDC;PAINTSTRUCT ps;hDC = BeginPaint(hwnd,&ps);TextOut(hDC,0,50,"abc",strlen("abc"));EndPaint(hwnd,&ps);break;case WM_CLOSE:if (IDYES == MessageBox(hwnd,"是否真的结束?","message",MB_YESNO)){DestroyWindow(hwnd);}break;case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(hwnd,uMsg,wparam,lparam);}return 0;}