VC6.0客户端和服务器通信例子

/* *TCP Stream Socket Server *这个例子说明如何实现一个Winsock TCP stream socket服务器。 *它接收从客户端发过来的消息并且发送一条消息到客户端。 */ #include <windows.h> #include <winsock.h> #include "resource.h" #include "PROCESS.H" #define PORTNUM 5000 // 端口号 #define MAX_PENDING_CONNECTS 4 // 等待连接队列的最大长度 #define WM_MESSAGE_REVED (WM_USER+0) //接收到数据包消息 #define WM_MESSAGE_SENDED (WM_USER+1) //发送出到数据包消息 //主线程向负责接收和发送的线程传递参数 typedef struct { HWND hwnd; //主线程的窗口句柄 BOOL bContinue; //状态指示参数 SOCKET WinSocket; //监听socket SOCKADDR_IN local_sin, //本地socket地址 accept_sin; //接收连接的socket地址 } PARAMS,*PPARAMS; char szServerA[100]; // ASCII string TCHAR szServerW[100]; // Unicode string TCHAR szError[100]; // Error message string TCHAR szSendBuffer[100]; // 线程间共享缓冲池 SOCKET ClientSock = INVALID_SOCKET; // 服务器和客户端通信的Socket BOOL WINAPI MainDlgProc( HWND hDlg, UINT msg, WPARAM wParam, LPARAM lParam ); void NetworkThread(PVOID pvoid); int WINAPI WinMain ( HINSTANCE hInstance, // 实例句柄 HINSTANCE hPrevInstance,// NULL LPTSTR lpCmdLine, // 用于运行程序的命令行 int nCmdShow) // 程序的最初的显示方式 { WNDCLASS wc; GetClassInfo( NULL, WC_DIALOG, &wc ); // Get dialog box class info wc.hInstance = hInstance; wc.lpszClassName = "Client"; // so's we can superclass it wc.lpfnWndProc = DefDlgProc; // all this for an icon...sheesh wc.hIcon = LoadIcon( hInstance, MAKEINTRESOURCE( 100 ) ); wc.cbWndExtra = DLGWINDOWEXTRA; if( ! RegisterClass( &wc ) ) // Quit if registration fails return( FALSE ); //hInst = hInstance; // Now just start the main dialog and exit DialogBox( hInstance, MAKEINTRESOURCE(ID_CLIENT), NULL, MainDlgProc ); return TRUE; } // === Main Dialog Box ======================================================== BOOL WINAPI MainDlgProc( HWND hDlg, UINT msg, WPARAM wParam, LPARAM lParam ) { static SOCKADDR_IN local_sin, // 本地socket地址 accept_sin; // 接收连接对象的地址 static SOCKADDR_IN destination_sin; // 服务器的socket地址 static PHOSTENT phostent = NULL; // 指向服务器的HOSTENT结构 static WSADATA WSAData; // 包含了Winsocket执行后的细节 static PARAMS params; static SOCKET WinSocket = INVALID_SOCKET; // Window socket switch( msg ) { case WM_INITDIALOG: //初始化对话框消息 { // 初始化Winsocket. if (WSAStartup (MAKEWORD(1,1), &WSAData) != 0) { wsprintf (szError, TEXT("WSAStartup failed. Error: %d"), WSAGetLastError ()); MessageBox (NULL, szError, TEXT("Error"), MB_OK); return FALSE; } //创建一个TCP/IP socket, WinSocket. if ((WinSocket = socket (AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) { wsprintf (szError, TEXT("Allocating socket failed. Error: %d"), WSAGetLastError ()); MessageBox (NULL, szError, TEXT("Error"), MB_OK); return FALSE; } // 填写本地socket地址信息 local_sin.sin_family = AF_INET; local_sin.sin_port = htons (PORTNUM); local_sin.sin_addr.s_addr = htonl (INADDR_ANY); // 把本地地址绑定到WinSocket. if (bind (WinSocket, (struct sockaddr *) &local_sin, sizeof (local_sin)) == SOCKET_ERROR) { wsprintf (szError, TEXT("Binding socket failed. Error: %d"), WSAGetLastError ()); MessageBox (NULL, szError, TEXT("Error"), MB_OK); closesocket (WinSocket); return FALSE; } // 建立一个socket监听到来的连接 if (listen (WinSocket, MAX_PENDING_CONNECTS) == SOCKET_ERROR) { wsprintf (szError, TEXT("Listening to the client failed. Error: %d"), WSAGetLastError ()); MessageBox (NULL, szError, TEXT("Error"), MB_OK); closesocket (WinSocket); return FALSE; } params.hwnd = hDlg; params.bContinue = TRUE; params.WinSocket = WinSocket; params.accept_sin = accept_sin ; params.local_sin = local_sin ; _beginthread(NetworkThread,0,&params); } case WM_PAINT: // 对话框绘制消息 { PAINTSTRUCT ps; HDC hDC; RECT Rect; hDC = BeginPaint( hDlg, &ps ); GetClientRect( hDlg, &Rect ); FillRect( hDC, &Rect, GetProp( hDlg, "BRUSH" ) ); EndPaint( hDlg, &ps ); return 0; } case WM_MESSAGE_REVED: //辅助线程接收到消息 { //把接收到的消息在对话框中显示 SetWindowText( GetDlgItem(hDlg,IDC_EDIT1), szServerW ); return 0; } case WM_COMMAND: //处理从控件传递来的消息 { if(wParam == IDC_SEND ) { //如果用户点击发送，从输入框中取得文本 GetWindowText(GetDlgItem(hDlg,IDC_EDIT), szSendBuffer,GetWindowTextLength(GetDlgItem(hDlg,IDC_EDIT))); //发送文本 if (send (ClientSock, szSendBuffer, strlen (szSendBuffer) + 1, 0) == SOCKET_ERROR) { wsprintf (szError, TEXT("Sending data to the server failed. Error: %d"), WSAGetLastError ()); MessageBox (NULL, szError, TEXT("Error"), MB_OK); } } else if(wParam == IDCANCEL) { EndDialog( hDlg, TRUE ); } return( TRUE ); } } return FALSE; } //辅助线程，负责socket通信 void NetworkThread(PVOID pvoid) { volatile PPARAMS pparams; int index = 0, // 索引 iReturn; int accept_sin_len; // accept_sin的长度 pparams = (PPARAMS)pvoid; accept_sin_len = sizeof (pparams->accept_sin); // 接收来自发送到WinSocket的连接请求 ClientSock = accept (pparams->WinSocket, (struct sockaddr *) &(pparams->accept_sin), (int *) &accept_sin_len); // 停止接收客户端的连接请求 closesocket (pparams->WinSocket); if (ClientSock == INVALID_SOCKET) { wsprintf (szError, TEXT("Accepting connection with client failed.") TEXT(" Error: %d"), WSAGetLastError ()); MessageBox (NULL, szError, TEXT("Error"), MB_OK); } for (;;) { // 从客户端接收数据 iReturn = recv (ClientSock, szServerA, sizeof (szServerA), 0); // 如果有数据，就显示之 if (iReturn == SOCKET_ERROR) { wsprintf (szError, TEXT("No data is received, recv failed.") TEXT(" Error: %d"), WSAGetLastError ()); MessageBox (NULL, szError, TEXT("Server"), MB_OK); break; } else if (iReturn == 0) { MessageBox (NULL, TEXT("Finished receiving data"), TEXT("Server"), MB_OK); break; } else { // 把ASCII码字符串转换成Unicode码字符串 for (index = 0; index <= sizeof (szServerA); index++) szServerW[index] = szServerA[index]; // 显示从服务器接收到的字符串 // MessageBox (NULL, szClientW, TEXT("Received From Server"), MB_OK); SendMessage(pparams->hwnd,WM_MESSAGE_REVED,0,0); } } // 发送一条消息到客户端 // 禁止ClientSock的接收和发送端口. shutdown (ClientSock, 0x02); // 关闭ClientSock. closesocket (ClientSock); WSACleanup (); }