Question

我有一个简单的 C ++ CGI应用程序，从客户端接收 数据。客户端是用C＃编写的，并使用 WWWForm 向C ++ CGI应用程序发送和接收数据，所有内容似乎都正常工作 一个例外即可。

例如，当我向CGI应用程序发送注册表单时，我的CGI应用程序能够接收数据，但当我发送电子邮件< / strong>对于表单中提供的电子邮件，它使客户端 等待，直到电子邮件已发送，然后断开连接< / strong>即可。

我想处理数据，断开客户端，然后发送电子邮件，因为发送电子邮件需要时间，我希望服务器响应快。

如何断开 客户端与CGI应用程序的连接？目前，客户端断开连接的唯一方法是 CGI应用程序关闭或结束，但 断开连接< / strong>客户过早，以便不必须等待才能将电子邮件完成发送？

我对此进行了在线研究，但没有找到任何解决方案。

Answer 1

我使用CodeBlocks和MinGW编写了一个非常简单的c ++ cgi。

它所做的就是创建一个分离的进程并直接返回。它没有读取任何请求。这将留给你。

要将数据传输到新进程，您可能必须将要发送的内容写入文件，然后通过传递给CreateProcess的命令行将该文件的路径提供给新进程。

我使用Xampp测试了cgi。请注意，您必须查看任务管理器以检查过程是否已启动，因为没有窗口会打开。

#include <iostream>
#include "windows.h"

using namespace std;

int main()
{
    cout << "Content-type: text/html\n\n";
    cout << "<html><head></head><body>";

    cout << "Hello world! I'm starting a batch job";

    cout << "</body></html>" << endl;

    STARTUPINFO siStartupInfo = {sizeof(STARTUPINFO)};

    siStartupInfo.cb = sizeof(siStartupInfo);
    siStartupInfo.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    siStartupInfo.wShowWindow = SW_HIDE;

    PROCESS_INFORMATION piProcessInfo;

    CreateProcess(NULL, (LPSTR)"\"D:\\Program Files (x86)\\CodeBlocks\\codeblocks.exe\" ",
    0, 0, false, CREATE_DEFAULT_ERROR_MODE | CREATE_NO_WINDOW | DETACHED_PROCESS , 0, 0,
    &siStartupInfo, &piProcessInfo);

    cout << "I created a new process!";

    return 0;
}

Answer 2

您的CGI应用程序只是一个C / C ++程序。考虑到这一点，如果您已经拥有发送电子邮件的代码，只需在另一个线程上运行它。

根据您在项目中配置的内容，您可以使用pthread或boost::thread。

使用pthread创建广告的示例：

#include <pthread.h>
#include <iostream>

typedef struct{
    // Sample parameters, use your own.
    std::string subject;
    std::string sender;
    std::string recipient;
    std::string message;
} EmailData;

void* do_send_mail(void* void_ptr)
{
    EmailData* data = (EmailData*)void_ptr;

    // your code that sends the email

    delete data;
    return NULL;
}

int main()
{
    // Thread handle
    pthread_t send_mail_thread;

    // Your email struct
    EmailData* email = new EmailData;

    email->subject = "Testing email.";
    email->recipient = "nobody@example.com";
    email->sender = "youremail@example.com";
    email->message = "You just won one billion dollars!";

    if(pthread_create(&send_mail_thread, NULL, do_send_mail, (void*)email)) {

        std::cout << "Failed to create thread that sends the email." << std::endl;
        return 1;

    }

    // Remove this "join" in your CGI application, it waits for the thread to
    // finish (which will make your client wait just like it does now)
    pthread_join(send_mail_thread, NULL);

    return 0;
}

使用boost::thread创建广告的示例：

#include <boost/thread.hpp>

typedef struct{
    // Sample parameters, use your own.
    std::string subject;
    std::string sender;
    std::string recipient;
    std::string message;
} EmailData;

void do_send_mail(EmailData& email)
{
    // your code that sends email here
}

int main(int argc, char* argv[])
{

    EmailData email;
    email.subject = "Testing email.";
    email.recipient = "nobody@example.com";
    email.sender = "youremail@example.com";
    email.message = "You just won one billion dollars!";

    boost::thread email_thread(boost::bind<void>(do_send_mail, email));

    // Remove this "join" in your CGI application, it waits for the thread to
    // finish (which will make your client wait just like it does now)
    email_thread.join();

    return 0;
}

使用boost::thread（使用lambda）创建线程的示例：

#include <boost/thread.hpp>

typedef struct{
    // Sample parameters, use your own.
    std::string subject;
    std::string sender;
    std::string recipient;
    std::string message;
} EmailData;

int main(int argc, char* argv[])
{

    EmailData email;
    email.subject = "Testing email.";
    email.recipient = "nobody@example.com";
    email.sender = "youremail@example.com";
    email.message = "You just won one billion dollars!";

    boost::thread email_thread(boost::bind<void>([](EmailData& email)->void{

        // your code that sends email here

    }, email));

    // Remove this "join" in your CGI application, it waits for the thread to
    // finish (which will make your client wait just like it does now)
    email_thread.join();

    return 0;
}

断开连接到cgi应用程序的客户端

2 个答案: