问题
This is a question first posted on qtforum.org where I've got no answer:
I have trouble hiding the Open dialog in a console application after it has been used. Here is the content of main.cc file used to test this behaviour:
#include <QApplication>
#include <QFile>
#include <QFileDialog>
#include <QString>
bool b_closing = false;
static QString gofn ( void )
{
QString s_file;
s_file = QFileDialog::getOpenFileName(
qApp->activeWindow(),
QObject::tr( "Select the file to open:" )
);
if ( !s_file.isEmpty() )
{
/* ... */
}
/* have no effect; */
QApplication::processEvents();
QApplication::sendPostedEvents();
return s_file;
}
static void userInpLoop ( void )
{
QFile cons_inp;
QFile cons_outp;
QString s_ln;
cons_inp.open( stdin, QIODevice::ReadOnly );
cons_outp.open( stdout, QIODevice::WriteOnly );
for ( ;; )
{
if ( b_closing )
break;
cons_outp.write( "\n>" );
cons_outp.flush();
s_ln = cons_inp.readLine().trimmed();
if ( s_ln == "q" )
{
b_closing = true;
cons_outp.write( "Closng...\n" );
}
else if ( s_ln == "gofn" )
{
cons_outp.write( gofn().toLatin1() );
}
else
{
cons_outp.write( "ERROR!!! \nInvalid input!\n" );
}
cons_outp.flush();
//break; /* just to test that a.exec() hides the dialog */
}
}
int main( int argc, char *argv[] )
{
/* we choose QApplication instead of QCoreApplication because we need some Gui components */
QApplication a(argc, argv);
userInpLoop();
//return a.exec(); /* this will hide the dialog */
return 0;
}
I build the application using this .pro file:
QT += core gui
TARGET = test_gofn
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cc
OS: Ubuntu 12.04
Qt: 4.8.2 builded from the trunk
回答1:
You might want to try
QEventLoop loop;
while (loop.processEvents())
/* nothing */;
I found it sometimes necessary to call the loop again...
回答2:
On Windows 7, compiled using Qt4.8.1 and Qt4.8.3 and openDialog was natural and hides after using.
Can you describe more, what happens at your side?
来源:https://stackoverflow.com/questions/12866490/qfiledialoggetopenfilename-in-console-application