TIdHTTP->Get UnicodeString trouble

[dan27125 0]

Indy TIdHTTP->Get UnicodeString trouble

 

Can you teach me how to format an acceptable string to pass to TIdHTTP->Get() ?

 

I'm working with Embarcadero C++Builder 11 trying to learn how to use Indy TIdHTTP->Get().   Attached are two examples. goodClick works but the URL is hard coded. badClick doesnt work. Looks maybe like I'm not properly formatting the URL string 
passed to TIdHTTP->Get().  The ip address is comming from a classic 8 bit ascii null terminated string like this "192.168.1.123".  sprintf(urlAscii, "http://%s//ajax.xml",iniCfg.ethTcp_ip);   

I need to take the ip address from iniCfg.ethTcp_ip which is an (8 bit asci null terminated string)  How can I fix the badClick example ?

 

here is example code... Thanks for your time !!

void __fastcall TEthTcpGateway::Button_goodClick(TObject *Sender)
{
    try
    {
        // This example works fine
        String s = "http://192.168.1.123/ajax.xml";     //Use hard coded string
        UnicodeString url,us;
        url = "http://192.168.1.123/ajax.xml";
        us = IdHTTP1->Get(url);
        AnsiString as = us;
        Memo1->Lines->Text = us;
    }
    catch (Exception &ex)
    {
        out << "Exception " << endl;
    }

}
//---------------------------------------------------------------------------
void __fastcall TEthTcpGateway::Button_badClick(TObject *Sender)
{

    extern char ethTcp_ip[64];   // Null terminated 8 bit character buffer "192.168.1.123";

    try
    {

        // This example does not work.
        char urlAscii[1000];
        // ethTcp_ip has classic 8 bit ascii null terminated string like this "192.168.1.123";
        sprintf(urlAscii, "http://%s/ajax.xml",ethTcp_ip);
        String s = urlAscii;
        UnicodeString url,us;
        url = s;    // Copy from String
        us = IdHTTP1->Get(url);
        AnsiString as = us;
        out << "Response" << endl << as.c_str() << endl;
        Memo1->Lines->Text = us;
    }
    catch (Exception &ex)
    {
        out << "Exception " << endl;
    }

}
 

Edited January 27 by dan27125
TypeO

[Remy Lebeau 1263]

6 hours ago, dan27125 said:

Indy TIdHTTP->Get UnicodeString trouble

This issue has nothing to do with Unicode.  You simply have a logic bug in your code.

6 hours ago, dan27125 said:

Can you teach me how to format an acceptable string to pass to TIdHTTP->Get() ?

You are already doing it.  You just have a mistake in your format string.

 

BTW, you can get rid of the char[] array and use the (s)printf() method of AnsiString/UnicodeString instead, eg:

AnsiString url;
url.printf("http://%s/ajax.xml", ethTcp_ip);
String us = IdHTTP1->Get(url);
out << "Response" << endl << AnsiString(us).c_str() << endl;
Memo1->Lines->Text = us;

Another option, albeit a little heavier-handed, is to use Indy's TIdURI class, eg:

#include <IdURI.hpp>
#include <memory>
  
std::unique_ptr<TIdURI> idUri(new TIdURI);
// or: auto idUri = std::make_unique<TIdURI>();

idUri->Protocol = _D("http");
idUri->Host = ethTcp_ip;
idUri->Path = _D("/");
idUri->Document = _D("ajax.xml");

String url = idUri->URI;

Quote

Attached are two examples. goodClick works but the URL is hard coded. badClick doesnt work. Looks maybe like I'm not properly formatting the URL string 
passed to TIdHTTP->Get().

Look VERY CAREFULLY at the two URLs you are passing to TIdHTTP::Get().  What do you see that is different between them?

 

In the bad example, there is an extra erroneous '/' character in front of the filename:

good: "http://192.168.1.123/ajax.xml"
bad:  "http://192.168.1.123//ajax.xml"
                            ^

Quote

How can I fix the badClick example ?

Fix your format string to remove the erroneous '/' character.

Quote

Also, I'm having finding Indy documenation. Are the Indy documenation links all broken right now? https://www.indyproject.org/documentation/

https://www.indyproject.org/2021/02/10/links-to-old-indy-website-pages-are-currently-broken/

Quote

Rad Studio web documenation is also troublesome too, slow or you get errors.

https://blogs.embarcadero.com/we-are-experiencing-a-hardware-outage/

https://ideasawakened.com/post/embarcadero-network-issues

Quote

Right now I'm assuming TIdHTTP->Get takes a UnicodeString string.

Yes, but you are not experiencing a Unicode problem, since your URL contains only ASCII characters.

Quote

Where can I find get PDF or HTML documenantion for Indy that I can download save on my computer ?

https://github.com/IndySockets/Indy/wiki/Documentation

Edited January 27 by Remy Lebeau