QProcess execute a unkown program

[grafzahl]

Hi,

i want to execute with QProcess a program (arm-linux-gnueabi-gcc), which Qt doesn't know. I need that for cross-compiling code for a Red Pitaya.

Terminal:

• molsyst@molsyst:~$ arm-linux-gnueabi-gcc
• arm-linux-gnueabi-gcc: fatal error: no input files
• compilation terminated.
  (program is recognised)

Qt:

• QProcess *compile1;
• compile1 = new QProcess(this);
• compile1->start("arm-linux-gnueabi-gcc");
• qDebug() << compile1->errorString();
  Output:
• Select all"No such file or directory"

But why does Qt not know a program, which the terminal knows?

I already asked this question in the RedPitaya Forum ( http://forum.redpitaya.com/viewtopic.php?f=14&t=465&p=1764 ), but i think here it is better placed.

Thanks in advance
GrafZahl

[mcosta]

Hi,

You have to provide the full path

[Vince Golubic]

Precisely. Here's a good example that can help.

http://doc.qt.io/qt-5/qdir.html

One other thing that can help, as a plan B.

You can execute a normal Linux process under Qt using the system (" ") call from within Qt -with arguments included in " ", or try:

Example:
{
const char* sys_command;

sys_command.toLatin1().constData() ;
system(sys_command);
}

[grafzahl]

Thanks for answers.

Full path was the solution, now it works fine. 8-)
I also now use the system command.

Thanks

[mcosta]

@grafzahl said:

I also now use the system command.

If you can, I suggest to use QProcess to run external commands. This for two reasons:

1. QProcess is cross-platform (in the future you could want to build your application also on other platforms);
2. You can have direct access to the standard out/err, ....