Sending curl command to command prompt using QProcess

Ahsan Niaz

@JonB Hi, I tried to do what you have suggested

QStringList arg;
            arg << "-X" << "https://content.dropboxapi.com/2/files/upload" << "--header" << "Authorization: Bearer access_token" << "--header" << fourr << "--header" <<"Content-Type:application/octet-stream"<<"--data-binary"<<fivee;
            qDebug() << arg;
            mproc.start("curl",arg);


            mproc.waitForFinished();
            QByteArray output = mproc.readAll();
            
              qDebug().noquote() << output;             
             //four = "Dropbox-API-Arg: {\"path\": \"/Orders/SatNov142020/United_Plof.CSV\\\"}\""
             // five = @C:/Users/U/Dropbox/order/United/2020_Sep_07_06_12_25__CSPROD_N.CSV"

I received nothing, no output,

Christian Ehrlicher

QProcess has waitForStart() with a return value, exitCode() and exitStatus() and some more which you should check.

Ahsan Niaz

@Christian-Ehrlicher exitcode returns (2)
and exitStatus returns QProcess::NormalExit

Christian Ehrlicher

So you should check what this return code tells you - man curl.
Can you show us how you initialize 'four' ? The debug output doesn't look correct due to the quoted "
You also forgot the second argument.

Ahsan Niaz

this is how i get (four)

char * x = "Dropbox-API-Arg: {\"path\": \"/Orders/";
            ba = s.toLocal8Bit();    //s has todays date
            char *c_str6 = ba.data();
            char *threee = new char[strlen(x) + strlen(c_str6) + 1];
            strcpy(threee, x);
            strcat(threee, c_str6);
            name = "/United_Plof.CSV\\\"}\"";
            char * fourr = new char[strlen(threee) + strlen(name) + 1];
            strcpy(fourr, threee);
            strcat(fourr, name);

Do you want me to check (man curl) in qprocess.start?
the only thing I wanted is to execute a command on a terminal or command prompt. the command is generated in qt code.

JonB

@Ahsan-Niaz said in Sending curl command to command prompt using QProcess:

//four = "Dropbox-API-Arg: {\"path\": \"/Orders/SatNov142020/United_Plof.CSV\\\"}\""

This at least looks wrong. You should be trying to get the fundamentals right: walk before you can run.

Do it with literal-strings first. I did that from the strings you showed me earlier. Putting in variables right now is error-prone. When you have the simplest example working correctly is the time to introduce those.
If you want to know how your QProcess code is sending the final arguments, write a one-line C/C++ program to just print out received argv contents, and use that as your curl command.

Ahsan Niaz

@JonB
I did it in literal strings as well with the following piece of code

QStringList arg;
            arg << "-X" << "https://content.dropboxapi.com/2/files/upload" << "--header" << "Authorization: Bearer access_token" << "--header" << "Dropbox-API-Arg: {\"path\": \"/Orders/FriNov132020/United_Plof.CSV\"}" << "--header" <<"Content-Type:application/octet-stream"<<"--data-binary"<<"@C:/Users/U/Dropbox/order/United/2020_Sep_06_06_29_29__CSPROD_N.CSV";
            qDebug() << arg;
            mproc.start("curl",arg);
            mproc.waitForStarted();

            mproc.waitForFinished();
             qDebug() <<  mproc.exitStatus();
            QByteArray output = mproc.readAll();
            qDebug().noquote() << output;

Still nothing in the output.

Bonnie

@Ahsan-Niaz
I think you forgot your "POST".

And about the obsolete start(command) function, it now uses QProcess::splitCommand to get arguments from the command.
I use that to print your command and it seems to get a little messy by getting:

Dropbox-API-Arg: {\path\: \/Orders/SatNov142020/United_Plof.CSV\}

So I look into the source code of splitCommand and I find this comment:

// handle quoting. tokens can be surrounded by double quotes
// "hello world". three consecutive double quotes represent
// the quote character itself.

So instead of \", you need """ to represent the quote character inside double quotes.
So I think \\\" should be changed to \"\"\" if you use the obsolete function.
Note1: I'm not encouraging using the obsolete function.
Note2: Hide your access token...

Christian Ehrlicher

@Bonnie said in Sending curl command to command prompt using QProcess:

@Ahsan-Niaz
I think you forgot your "POST".

You also forgot the second argument.

He does not read the comments so what do you expect?

Ahsan Niaz

I am really thankful to everyone who replied to me and corrected my mistakes. Your help will help me finish my work quicker.
Thanks @Christian-Ehrlicher , @Bonnie @JonB