#include <windows.h> BOOL CALLBACK EnumChildProc(HWND hWnd,LPARAM lParam); int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow) {   char className[]="notepad";   HWND hWnd=::FindWindow(className,NULL);       if(hWnd)   {     ::EnumChildWindows(hWnd,EnumChildProc,0);     return 0;   }   MessageBox(NULL,"fail!","fail",MB_OK);   return 0; } BOOL CALLBACK EnumChildProc(HWND hWnd,LPARAM lParam) {   char temp1[256],temp2[256];   ::GetClassName(hWnd,temp1,255);   if(!::strcmp(temp1,"Edit"))   {     ::SendMessage(hWnd,WM_GETTEXT,sizeof(temp2)/sizeof(char),(LPARAM)temp2);    //EDIT的句柄，消息，接收緩沖區(qū)大小，接收緩沖區(qū)指針     ::MessageBox(NULL,temp2,"get",MB_OK);      return 0;   }   ::wsprintf(temp2,"classname: %s",temp1);   MessageBox(NULL,temp2,"cwnd",MB_OK);   return true; }