将Delphi代码的Indy 10写入C ++ Builder的Indy 10

时间:2015-06-27 19:54:27

标签: delphi c++builder indy indy10 indy-9

我是学习C ++ Builder的新手。三天前,我安装了Embarcadero®。 C ++Builder®2010。这门语言对我来说非常有趣。

在Delphi中,我通常使用Indy 9和10的TIdMappedPortTCP编写一个简单的代理服务器。我通常使用其OnExecute和OnOutboundData事件来修改数据,因为它通过代理。

由于我是C ++ Builder的新手,所以我不知道如何将我的Delphi代码转换为完全正确的C ++ Builder代码。

我尝试过很多方法,包括阅读几本书,其中一本是 Borland C ++ Builder - 完整参考 Herbert Schildt ,以及增加知识。不幸的是,书中没有讨论与我的病情有关的所有非常重要的事情。此外,我在谷歌上找到了参考资料,但我没有找到。

所以,我冒昧地向你寻求帮助。我真的需要它。 请帮忙!非常感谢你。

以下是我想要写入C ++ Builder的Indy 10的Delphi代码。

......

procedure TForm.IdMappedPortTCP1Execute(AContext: TIdContext);
var
Mydata, NetData: string;
begin
  if (Pos('HTTP',netstring(AContext)) <> 0) or (Pos('GET',netstring(AContext)) <> 0) then begin
   NetData := netstring(AContext);
   TIdMappedPortContext(AContext).OutboundClient.IOHandler.Write(AddHeader(netstring(AContext),'Connection: Keep-Alive'));
     Sleep(1000);
     Mydata  := 'GET http://website.com/ HTTP/1.1'+#13#10+'Host: website.com'#13#10;
     NetData := Mydata + Netdata;
   TIdMappedPortContext(AContext).NetData := netbyte(Netdata);
   TIdMappedPortContext(AContext).OutboundClient.IOHandler.Write(netbyte(Mydata + NetData));
  end;
end;

......

1 个答案:

答案 0 :(得分:4)

C ++ Builder的文字翻译如下所示:

......

String __fastcall AddHeader(String S, String Header)
{
    S = StringReplace(S, "\r\n\r\n", "\r\n" + Header + "\r\n\r\n", TReplaceFlags() << rfReplaceAll);
    return S;
}

void __fastcall TForm::IdMappedPortTCP1Execute(TIdContext *AContext)
{
    String Mydata, NetData;

    if ((netstring(AContext).Pos("HTTP") != 0) || (netstring(AContext).Pos("GET") != 0))
    {
        NetData = netstring(AContext);
        TIdMappedPortContext(AContext)->OutboundClient->IOHandler->Write(AddHeader(netstring(AContext), "Connection: Keep-Alive"));
        Sleep(1000);
        Mydata = "GET http://website.com/ HTTP/1.1\r\nHost: website.com\r\n";
        NetData = Mydata + Netdata;
        static_cast<TIdMappedPortContext*>(AContext)->NetData = netbyte(Netdata);
        static_cast<TIdMappedPortContext*>(AContext)->OutboundClient->IOHandler->Write(netbyte(Mydata + NetData));
    }
}

......

这是一个略微浓缩的版本:

......

String __fastcall AddHeader(String S, String Header)
{
    return StringReplace(S, "\r\n\r\n", "\r\n" + Header + "\r\n\r\n", TReplaceFlags() << rfReplaceAll);
}

void __fastcall TForm::IdMappedPortTCP1Execute(TIdContext *AContext)
{
    String NetData = netstring(AContext);
    if ((NetData.Pos("HTTP") != 0) || (NetData.Pos("GET") != 0))
    {
        Sleep(1000);
        String Mydata = "GET http://website.com/ HTTP/1.1\r\nHost: website.com\r\n" + AddHeader(NetData, "Connection: Keep-Alive");
        static_cast<TIdMappedPortContext*>(AContext)->NetData = netbyte(Mydata);
    }
}

......

但不管怎样,这绝对不是在Indy中实现可行的HTTP代理的可靠方法。事实上,Indy 10为此目的引入了一个特定的TIdHTTPProxyServer组件。您应该认真考虑使用它而不是TIdMappedPortTCP。例如,上述内容可以在TIdHTTPProxyServer中完成,如下所示:

class TIdHTTPProxyServerContextAccess : public TIdHTTPProxyServerContext
{
public:
    void SetCommand(String Value) { FCommand = Value; }
    void SetDocument(String Value) { FDocument = Value; }
    void SetTarget(String Value) { FTarget = Value; }
};

void __fastcall TForm1.IdHTTPProxyServer1HTTPBeforeCommand(TIdHTTPProxyServerContext *AContext)
{
    static_cast<TIdHTTPProxyServerContextAccess*>(AContext)->SetCommand("GET");
    static_cast<TIdHTTPProxyServerContextAccess*>(AContext)->SetTarget ("http://website.com/");
    static_cast<TIdHTTPProxyServerContextAccess*>(AContext)->SetDocument("/");

    AContext->Headers->Values["Host"] = "website.com";
    AContext->Headers->Values["Connection"] = "Keep-Alive";

    /*
    the original code was not changing the Host/Port where the
    HTTP request was being sent to.  But if you needed to,
    you can do it like this... 

    static_cast<TIdTCPClient*>(AContext->OutboundClient)->Host = "website.com";
    static_cast<TIdTCPClient*>(AContext->OutboundClient)->Port = 80;
    */
}

更新:您链接的netstring()netbyte()函数存在语法错误,并且有不必要的开销(不需要仅将MIME转换为一个字节数组,反之亦然,Indy具有专门用于此目的的功能)。以下是更正后的版本:

String __fastcall netstring(TIdMappedPortContext* AContext)
{
    return BytesToStringRaw(AContext->NetData);
}

TIdBytes __fastcall netbyte(String S)
{
    return ToBytes(S, IndyTextEncoding_8Bit());
}

所以,你实际上可以完全消除这些功能:

void __fastcall TForm::IdMappedPortTCP1Execute(TIdContext *AContext)
{
    TIdMappedPortContext *ctx = static_cast<TIdMappedPortContext*>(AContext)
    String NetData = BytesToStringRaw(ctx->NetData);
    if ((NetData.Pos("HTTP") != 0) || (NetData.Pos("GET") != 0))
    {
        Sleep(1000);
        String Mydata = "GET http://website.com/ HTTP/1.1\r\nHost: website.com\r\n" + AddHeader(NetData, "Connection: Keep-Alive");
        ctx->NetData = ToBytes(Mydata);
    }
}