Invalid parameter passed to C runtime function.

[torsten]

I have a problem with a application. I've created a debug handler with a own debug window. On a system without Qt, only the needed files, the windows works as expected, but if i work on a system installed with qt, the application crashs with the output "Invalid parameter passed to C runtime function." and with an error box from Microsoft Visual C++ Runtime Library.

I'm not sure what the problem is. The debugwindowdemo is a simple ui class with some debug output. The other files i have posted here.

main.cpp
@#include "debugwindowdemo.h"
#include "debughandler.h"
#include <QtGui/QApplication>
#include <QWidget>
#include <QtGlobal>
#include <QTextBrowser>

int main( int argc, char* argv[] ) {
QApplication app( argc, argv );

qInstallMsgHandler(debugWinMsgHandler);

DebugWindowDemo *dialog = new DebugWindowDemo;
dialog->show();

return app.exec();

}
@

debughandler.h
@#ifndef DEBUGHANDLER_H
#define DEBUGHANDLER_H

#include "debugwindow.h"

void debugWinMsgHandler (QtMsgType type, const char* msg) {
static DebugWindow* debugWindow = new DebugWindow;
debugWindow->move(0,0);
debugWindow->show();
switch(type) {
case QtDebugMsg:
debugWindow->append(QString(QObject::tr("D: %1")).arg(msg));
break;
case QtWarningMsg:
debugWindow->append(QString(QObject::tr("W: %1")).arg(msg));
break;
case QtCriticalMsg:
debugWindow->append(QString(QObject::tr("C: %1")).arg(msg));
break;
case QtFatalMsg:
debugWindow->append(QString(QObject::tr("F: %1")).arg(msg));
break;
}
}
#endif
@

debugwindow.h
@#ifndef DEBUGWINDOW_H
#define DEBUGWINDOW_H

#include <QDialog>

namespace Ui {
class DebugWindow;
}

class DebugWindow : public QDialog
{
Q_OBJECT

public:
explicit DebugWindow(QWidget *parent = 0);
~DebugWindow();

public slots:
void append(QString);

private:
Ui::DebugWindow *ui;

private slots:
void search(QString);
void print();
void save();

};

#endif // DEBUGWINDOW_H
@

debugwindow.cpp
@#include "debugwindow.h"
#include "ui_debugwindow.h"

#include <QMessageBox>
#include <QFileDialog>
#include <QTextStream>
#include <QPrintDialog>
#include <QPrinter>
#include <QFont>

DebugWindow::DebugWindow(QWidget *parent) :
QDialog(parent),
ui(new Ui::DebugWindow)
{
QFont newFont("Ubuntu", 8);
this->setFont(newFont);
ui->setupUi(this);
ui->tbClear->setVisible(false);
connect(ui->leSearch,SIGNAL(textChanged(QString)),this,SLOT(search(QString)));
connect(ui->tbClear,SIGNAL(clicked()),ui->leSearch,SLOT(clear()));
connect(ui->pbPrint,SIGNAL(clicked()),this,SLOT(print()));
connect(ui->pbSave,SIGNAL(clicked()),this,SLOT(save()));
connect(ui->pbClose,SIGNAL(clicked()),this,SLOT(close()));
}

DebugWindow::~DebugWindow()
{
delete ui;
}

void DebugWindow::append(QString str)
{
ui->teLog->append(str);
}

void DebugWindow::search(QString pattern)
{
ui->tbClear->setVisible(!pattern.isEmpty());
QTextDocument* document = ui->teLog->document();

QTextCharFormat noBackground;
noBackground.clearBackground();
QTextCharFormat highlight;
highlight.setBackground (QBrush(QColor(239,41,41,200)));

QTextCursor allText  = QTextCursor(document);
allText.select(QTextCursor::Document);
allText.setCharFormat(noBackground);

QRegExp expression = QRegExp(pattern,Qt::CaseInsensitive,QRegExp::RegExp2);

QTextCursor cursor = document->find(expression,QTextCursor(document),0);
while (!cursor.isNull()) {
    cursor.select(QTextCursor::LineUnderCursor);
    cursor.setCharFormat(highlight);
    cursor = document->find(expression,cursor,0);
}

}

void DebugWindow::save()
{
QString fileName = QFileDialog::getSaveFileName(this,QObject::tr("Logfile speichern"),QDir::homePath(),QObject::tr("Logfile (*.log)"));
if (!fileName.isEmpty())
{
if (!fileName.endsWith("log"))
{
fileName = fileName+".log";
}
QFile file(fileName);
if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
{
QString message = QString("%1%2%3")
.arg(QObject::tr("Die Datei "))
.arg(fileName)
.arg(QObject::tr(" kann nicht gespeichert werden!"));
QMessageBox::critical(this,QObject::tr("Fehler beim Speichenrn der Logfile."),message);
}
else
{
QTextStream out(&file);
out.setGenerateByteOrderMark(true);
out << ui->teLog->toPlainText();
file.close();
QString message = QString("%1%2%3")
.arg(QObject::tr("Die Logfile "))
.arg(fileName)
.arg(QObject::tr(" wurde erfolgreich gespeichert!"));
QMessageBox::information(this,QObject::tr("Logfile erfolgreich gespeichert!"),message);
}
}
}

void DebugWindow::print()
{
QTextDocument *document = ui->teLog->document();
QPrinter printer;
QPrintDialog printDialog(&printer);
if (printDialog.exec() != QDialog::Accepted)
{
return;
}
document->print(&printer);
}
@

[giesbert]

What do you mean by "work on a system installed with qt"?
Which compilers do you use?
With which compiler was the installed Qt version build?

[torsten]

“work on a system installed with qt” means a installed qt sdk (including qt path in the $PATH)
I'm using the build 2010.05 mingw

[giesbert]

so, you are using build 2010.05 with mingw. And which version is installed on the machine, where it crashes? Are those versions the same? The error sounds (for a first read) to be caused by different versions or different builds (with different parameters, compilers etc). That's why I'm asking...

[torsten]

The same version is installed on the system where it crash. the "funny" part is, on a system without qt sdk, only with the needed qt files (libgcc_s_dw2-1.dll, mingwm10.dll, QtCored4.dll, QtGuid4.dll) it works.

Last night i found out (lot of things i've tried eg switching debugwindow from qdialog to qwidget), that it has to be a problem of the ui file (i think so)... i created a new designer class, copied!!! the code into the cpp/h files and "copied" the ui elements with the designer to the other ui file... and you wouldn't believe it, it works.. i will post the original ui file... i haven't found any errors within, but maybe there is another problem:

debugwindow.ui
http://pastebin.com/XpiyNF3K

[torsten]

It seems to be an ansi/utf8 conversion error if the ui file is ansi encoded. i converted ui file to utf8. ive'd used the rc version of the qtcreater who was warning of wrong encoded file (so i figured it out).

[snowpong]

Thanks for the hint here Torsten - I had a similar problem here. The only difference was a .qml file was saved with whatever System encoding Mac runs, and on my Win7 I got the same "Invalid parameter passed to C runtime function.” error.

The fix was to "Save with Encoding" UTF-8 and rebuild - then it worked without errors? Did you file a bug-report?

_Update: _ Actually turned out to be another bug (exception thrown and the program didn't know what to do) :) Nevermind, nothing to see here :D

[torsten]

No, i didn't file a bug, because it's not a "bug" after all. Maybe they should add a feature to configure the basic encoding the creator should use. (I know, you can choose the encoding, but that doesn't change the creator defaults).