Using QProcess with a string containing path to file for execution

Question

I am using Qt. Can anyone tell me how to use string inside QProcess? To be more clear I am making a image convertor in which I take target file path of png file to a string using QFileDialog. Now I have a exe file which does all conversion of png to jpeg and I need to do somehing like this:

convertor.exe  path/to/png/file  path/for/storing/converted/output

How I can do this in Qt?

QProcess conv;
conv.start("C:/converter.exe" ??) what to do here?

user362638 · Accepted Answer · 2012-08-01 17:54:35Z

3

You can give the arguments to the process as a QStringList:

QStringList args;
args << "path/to/png/file" << "path/for/storing/converted/output";
QProcess conv;
conv.start("C:/converter.exe", args);

answered Aug 1, 2012 at 17:54

user362638

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4 Comments

Varun Chitre Over a year ago

Thank you I will try this :D Cannot vote up as I have reputation<15 :D

Frank Osterfeld Over a year ago

Varun Chitre: You can accept the answer though if it helped you.

Varun Chitre Over a year ago

Instead of QStringList args can we use QString args?

user362638 Over a year ago

Yes. See documentation. But I have usually found it more convenient and less error prone to use QStringList. For example, if your paths can contain spaces, it is much easiers to use the QStringList version.

jesterjunk · Accepted Answer · 2016-01-11 14:06:44Z

1

Arguments to QProcess are passed in a QStringList: http://doc.qt.io/qt-4.8/qprocess.html#start

QStringList args;
args << pathToPng << pathToOutput
QProcess conv;
conv.start("c:/converter.exe", args);

edited Jan 11, 2016 at 14:06

jesterjunk

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answered Aug 1, 2012 at 17:56

Stephen Chu

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