c++ - 如何通过 post 方法将数据发送到 C++ 中的 php 文件？

Question

我是 C++ 的新手。最近我试图通过 post 方法将一些数据传递给 c++ 中的 php 文件。我试过来自 MSDN send Function 的教程.代码如下:

#ifndef UNICODE
#define UNICODE
#endif

#define WIN32_LEAN_AND_MEAN

#include <winsock2.h>
#include <Ws2tcpip.h>
#include <stdio.h>
#include <conio.h>

// Link with ws2_32.lib
#pragma comment(lib, "Ws2_32.lib")

#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT 27015

int main() {

    //----------------------
    // Declare and initialize variables.
    int iResult;
    WSADATA wsaData;
    struct hostent *host;

    SOCKET ConnectSocket = INVALID_SOCKET;
    struct sockaddr_in clientService;

    int recvbuflen = DEFAULT_BUFLEN;
    char *sendbuf = "Client: sending data test";
    char recvbuf[DEFAULT_BUFLEN] = "";

    //----------------------
    // Initialize Winsock
    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != NO_ERROR) {
        wprintf(L"WSAStartup failed with error: %d\n", iResult);
        return 1;
    }

    //----------------------
    // Create a SOCKET for connecting to server
    ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (ConnectSocket == INVALID_SOCKET) {
        wprintf(L"socket failed with error: %ld\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    //----------------------
    // The sockaddr_in structure specifies the address family,
    // IP address, and port of the server to be connected to.
    clientService.sin_family = AF_INET;
    clientService.sin_addr.s_addr = inet_addr( "127.0.0.1" );

    clientService.sin_port = htons( 80 );

    //----------------------
    // Connect to server.
    iResult = connect( ConnectSocket, (SOCKADDR*) &clientService, sizeof(clientService) );
    if (iResult == SOCKET_ERROR) {
        wprintf(L"connect failed with error: %d\n", WSAGetLastError() );
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
  }

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

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

    // shutdown the connection since no more data will be sent
    iResult = shutdown(ConnectSocket, SD_SEND);
    if (iResult == SOCKET_ERROR) {
        wprintf(L"shutdown failed with error: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }

    // Receive until the peer closes the connection
    do {

        iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
        if ( iResult > 0 )
            wprintf(L"Bytes received: %d\n", iResult);
        else if ( iResult == 0 )
            wprintf(L"Connection closed\n");
        else
            wprintf(L"recv failed with error: %d\n", WSAGetLastError());

    } while( iResult > 0 );


    // close the socket
    iResult = closesocket(ConnectSocket);
    if (iResult == SOCKET_ERROR) {
        wprintf(L"close failed with error: %d\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    WSACleanup();
    getch();
}

它将数据发送到 localhost 的主页，但我想将数据发送到 localhost 中的其他地方(例如，像“localhost/test/index.php”)。如果我将代码从 clientService.sin_addr.s_addr = inet_addr( "127.0.0.1"); 更改为 clientService.sin_addr.s_addr = inet_addr( "127.0.0.1/test/index.php "); 然后我在 exe 文件中收到一些错误。但是程序编译成功。

请给我一个解决方案。我现在该怎么办？

Answer 1

您采用了错误的方法。低级套接字层只允许您连接到特定服务器(例如，您在 127.0.0.1 上运行的本地 http 服务器监听端口 80)并发送原始数据。您需要与该服务器进行 HTTP 通信才能真正执行您想要执行的操作。

我建议，如果您是 C++ 的新手，您可以查看许多 C++ 第三方库中的一个，它允许您与 http 服务器“进行 HTTP 对话”- 例如，libCurl