孙鑫VC++深入详解:Lesson1

1. 开始我从MSDN 中copy WinMain原型时,搞错了

下面的代码编译是说 WinMain不能重载.....原来是参数不对. LPWSTR, 指向宽字符串的指针,16位=2个字节=一个字word

LPCWSTR--- Pointer to a constant null-terminated string of 16-bit Unicode characters. For more information, see Character Sets Used By Fonts. 

下面这个WinMain是基于WIN CE

This function is called by the system as the initial entry point for WindowsCE-based applications.

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nShowCmd ); 

下面这个是基于Windows ,  for a Windows-based application.

The WinMain function is called by the system as the initial entry point for a Windows-based application. 

应是这个, LPSTR 

LPCSTR--- Pointer to a constant null-terminated string of 8-bit Windows (ANSI) characters. For more information, see Character Sets Used By Fonts. 

int WINAPI WinMain(  HINSTANCE hInstance,      // handle to current instance  HINSTANCE hPrevInstance,  // handle to previous instance  LPSTR lpCmdLine,          // command line  int nCmdShow              // show state);

2. 用couter 来统计 WM_PAINT 的消息.

最小化,最大化,被其他程序盖住界面,改变窗口的宽度 都会产生 WM_PAINT

奇怪的是 改变窗口高度 不会产生 WM_PAINT消息

    

#include <windows.h>#include <stdio.h>LRESULT CALLBACK WindowProc(HWND hwnd,      // handle to windowUINT uMsg,      // message identifierWPARAM wParam,  // first message parameterLPARAM lParam   // second message parameter);int WINAPI WinMain(   HINSTANCE hInstance,      // handle to current instance   HINSTANCE hPrevInstance,  // handle to previous instance   LPSTR lpCmdLine,          // command line   int nCmdShow              // show state   ){    WNDCLASS wc={0};//wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);wc.hCursor = LoadCursor(NULL,IDC_CROSS);wc.hIcon = LoadIcon(NULL,IDI_ASTERISK);wc.hInstance = hInstance;wc.lpfnWndProc = WindowProc;wc.lpszClassName ="weixin2003";wc.lpszMenuName = NULL;wc.style = CS_HREDRAW |CS_HREDRAW;RegisterClass(&wc);HWND hwnd;hwnd = CreateWindow("weixin2003","--窗口标题--",WS_OVERLAPPEDWINDOW &~WS_MAXIMIZEBOX,/* 不是WS_MAXIMIZE */200,200,600,400, NULL,NULL, hInstance, NULL); ShowWindow(hwnd,SW_SHOWNORMAL); UpdateWindow(hwnd); MSG msg; while(GetMessage(&msg,NULL,0,0)) {TranslateMessage(&msg);DispatchMessage(&msg);  }//---return msg.wParam;}LRESULT CALLBACK WindowProc(HWND hwnd,      // handle to windowUINT uMsg,      // message identifierWPARAM wParam,  // first message parameterLPARAM lParam   // second message parameter){char szChar[20]; HDC hdc; char pchar[40]; //输出 window painted 的次数信息 static int cnt=0; // 统计WM_PAINT的次数,看看那些操作会导致WM_PAINTswitch(uMsg) {case WM_CHAR:sprintf(szChar,"char is %d",wParam);MessageBox(hwnd,szChar,"weixin",MB_OKCANCEL|MB_ICONQUESTION);  break;case WM_LBUTTONDOWN:  MessageBox(hwnd,"mouse clicked","caption",0);   hdc = GetDC(hwnd);  TextOut(hdc,0,50,"mouse clicked",strlen("mouse clicked"));  ReleaseDC(hwnd,hdc);  break;case WM_PAINT: cnt++;// sprintf(pchar,"window painted: %d",cnt);PAINTSTRUCT ps;  hdc = BeginPaint(hwnd,&ps);  TextOut(hdc,0,0,pchar, sprintf(pchar,"window painted: %d",cnt));  EndPaint(hwnd,&ps);break;case WM_CLOSE: DestroyWindow(hwnd);break;case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(hwnd,uMsg,wParam,lParam);}return 0;}