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在用戶端上傳送和接收資料

下列程式碼示範建立連線之後,用戶端所使用的 傳送recv 函式。

Client

#define DEFAULT_BUFLEN 512

int recvbuflen = DEFAULT_BUFLEN;

const char *sendbuf = "this is a test";
char recvbuf[DEFAULT_BUFLEN];

int iResult;

// Send an initial buffer
iResult = send(ConnectSocket, sendbuf, (int) strlen(sendbuf), 0);
if (iResult == SOCKET_ERROR) {
    printf("send failed: %d\n", WSAGetLastError());
    closesocket(ConnectSocket);
    WSACleanup();
    return 1;
}

printf("Bytes Sent: %ld\n", iResult);

// shutdown the connection for sending since no more data will be sent
// the client can still use the ConnectSocket for receiving data
iResult = shutdown(ConnectSocket, SD_SEND);
if (iResult == SOCKET_ERROR) {
    printf("shutdown failed: %d\n", WSAGetLastError());
    closesocket(ConnectSocket);
    WSACleanup();
    return 1;
}

// Receive data until the server closes the connection
do {
    iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
    if (iResult > 0)
        printf("Bytes received: %d\n", iResult);
    else if (iResult == 0)
        printf("Connection closed\n");
    else
        printf("recv failed: %d\n", WSAGetLastError());
} while (iResult > 0);

sendrecv函式都會分別傳回所傳送或接收位元組數目的整數值,或傳回錯誤。 每個函式也會採用相同的參數:使用中的通訊端、 char 緩衝區、要傳送或接收的位元組數目,以及要使用的任何旗標。

下一個步驟: 中斷用戶端連線

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