QProcess and scanimage (Linux)
-
I'm trying to make the QProcess class work with the linux scanimage application to scan documents that are on paper.
My scanner is a Canon CanoScan.
I have tried several ways, but the QProcess START statement does that it works, but it does not trigger the scanner.
Anyone have any tips?
void ClasseScanner :: on_pbScanDOC_clicked () {
QString tipo_os = QSysInfo :: productType ();QString file_folder = QStandardPaths :: writableLocation (QStandardPaths :: AppConfigLocation);
folder_file.append ("/ docto_scan.tif");QString command = "scanimage -l 0 -t 0 -x 90 -and 220 -mode Color --resolution 150 --rightness 0 --contrast 0 --format = tiff>";
command.append (file_file);if (type_us.pare ("ubuntu") == 0) {
process = new QProcess (this);
process-> start (command);if (! process-> waitForFinished (-1)) qDebug () << "Failed:" << process-> errorString ();
else qDebug () << "OK" << process-> readAll ();
}
} -
Hi,
Please build the argument list like shown in the QProcess documentation.
-
I'm trying to make the QProcess class work with the linux scanimage application to scan documents that are on paper.
My scanner is a Canon CanoScan.
I have tried several ways, but the QProcess START statement does that it works, but it does not trigger the scanner.
Anyone have any tips?
void ClasseScanner :: on_pbScanDOC_clicked () {
QString tipo_os = QSysInfo :: productType ();QString file_folder = QStandardPaths :: writableLocation (QStandardPaths :: AppConfigLocation);
folder_file.append ("/ docto_scan.tif");QString command = "scanimage -l 0 -t 0 -x 90 -and 220 -mode Color --resolution 150 --rightness 0 --contrast 0 --format = tiff>";
command.append (file_file);if (type_us.pare ("ubuntu") == 0) {
process = new QProcess (this);
process-> start (command);if (! process-> waitForFinished (-1)) qDebug () << "Failed:" << process-> errorString ();
else qDebug () << "OK" << process-> readAll ();
}
}@cvitagliano said in QProcess and scanimage (Linux):
QString command = "scanimage -l 0 -t 0 -x 90 -and 220 -mode Color --resolution 150 --rightness 0 --contrast 0 --format = tiff>"; command.append (file_file);If I read you right, your command is using the
>output redirection symbol right at the end, to send output to a file? You won't be able to do that if you execute aQProcesswithscanimageas the executable.You will need either to send the whole string for execution to
/bin/shor/bin/bashso that the shell interprets and acts on the>for you, or you could use http://doc.qt.io/qt-5/qprocess.html#setStandardOutputFile to set up the output file yourself from the calling program instead. -
@cvitagliano said in QProcess and scanimage (Linux):
QString command = "scanimage -l 0 -t 0 -x 90 -and 220 -mode Color --resolution 150 --rightness 0 --contrast 0 --format = tiff>"; command.append (file_file);If I read you right, your command is using the
>output redirection symbol right at the end, to send output to a file? You won't be able to do that if you execute aQProcesswithscanimageas the executable.You will need either to send the whole string for execution to
/bin/shor/bin/bashso that the shell interprets and acts on the>for you, or you could use http://doc.qt.io/qt-5/qprocess.html#setStandardOutputFile to set up the output file yourself from the calling program instead.@JonB Thank you very much. The two alternatives worked perfectly.
