How to launch batch script from Qt?

graniteDev

I have several batch scripts which reside in a common folder outside the development folder my Qt app is built in.

If I move the batch files into the same folder as my exe and run

switchDevProcess->execute(".\\Switch_to_development.bat");

The batch file runs as expected. However if I try to run the batch file from where it actually will be in production

switchDevProcess->execute("C:\\epic\\GPS Scripts\\Switch_to_development.bat");

Nothing happens. What am I missing?

aha_1980

@graniteDev said in How to launch batch script from Qt?:

switchDevProcess->execute("C:\epic\GPS Scripts\Switch_to_development.bat");

May the problem be related to the space in your path? Can you try a path without space?

PS: if switchDevProcess is a QProcess, you should rather use forward slashes / instead backslashes \ as path separator.

SGaist

Hi,

To add to @aha_1980, you should check the status code and errorOccured signal from QProcess.

mrjj

Hi
and be aware of space in path.

"C:\\epic\\**GPS Scripts**\\Switch_to_development.bat"

graniteDev

I can't believe the space was the problem. I had actually tried to fix that earlier using \ to escape the space, but that didn't help, so I assumed the space was not the problem.

Yes, removing the space worked. Problem is, I don't have control over that directory, I have to live with the space, and spaces in other directories. I'm building this right now, see if works...

switchDevProcess->execute("C:/epic/GPS\ Scripts/Switch_to_development.bat");

graniteDev

@mrjj
escaping the space with \ didn't work, do I need to use the double ** like you did, or was that simply to bring it to my attention?

mrjj

@graniteDev
The ** is just for bold but i ruined it with code tags :)
Escaping normally works. Let me check.

Update:
https://forum.qt.io/topic/81087/qt-create-cmd-and-execute-bat-file/2

Seems to escape the whole path. not just space.

graniteDev

So I've tried encapsulating the whole string in single quotes....

switchDevProcess->execute("'C:/epic/GPS Scripts/Switch_to_development.bat'");

...and escaping the space...

switchDevProcess->execute("C:/epic/GPS\ Scripts/Switch_to_development.bat");

neither worked. How is one supposed to deal with spaces in the path?

SGaist

Did you try my suggestions (status code, errorOccured signal) to see what is happening ?

mrjj

Hi
Something like

 "\"C:\\epic\\GPS Scripts\\Switch_to_development.bat\""

graniteDev

I get

QIODevice::read: device not open

graniteDev

@mrjj said in How to launch batch script from Qt?:

Hi
Something like

 "\"C:\\epic\\GPS Scripts\\Switch_to_development.bat\""

YES! This worked! Thank you!