Empty window when running application on Windows XP 32 bits

[athan_david]

I don't know how or what I did, but I don't have that plugin error anymore.
Anyway, I did again a release. I've put these files:
files.jpg
and when I run it, the "magic" white rectangle appears.
I tried again to run it from cmd, as you suggested, Chris, and here is the result:
app_running.jpg
and again Dependency Walker:
dependency_error.jpg

That MPR.dll seems to be inside Qt5Core.dll. What's wrong with Qt5Core.dll? Is there a problem with the file on Windows XP?

[ChrisW67]

Mpr.dll is part of Windows and a Dependency Walker warning is typical on XP and can be ignored.
http://www.dependencywalker.com/faq.html

Remove the registerResource() call from your main(). The qrc file and the files it references are built into the exe when the qrc is listed in the RESOURCES qmake variable in your pro file.

Try a do-nothing QML example like the one on this page
http://qt-project.org/doc/qt-5.0/qtq...eployment.html

[athan_david]

Chris, as you did suggest, I created a project with this main.qml :

import QtQuick 2.0
 
Rectangle {
    width: 100
    height: 100
    color: "red"
}

import QtQuick 2.0

Rectangle {
    width: 100
    height: 100
    color: "red"
}

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and this is the main.cpp:

#include <QtGui/QGuiApplication>
#include "qtquick2applicationviewer.h"
 
int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
 
    QtQuick2ApplicationViewer viewer;
    viewer.setSource(QUrl("qrc:/qml/DeploymentProjectTest/main.qml"));
    viewer.showExpanded();
 
    return app.exec();
}

#include <QtGui/QGuiApplication>
#include "qtquick2applicationviewer.h"

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

    QtQuick2ApplicationViewer viewer;
    viewer.setSource(QUrl("qrc:/qml/DeploymentProjectTest/main.qml"));
    viewer.showExpanded();

    return app.exec();
}

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And these are the results:
Windows 8 Pro:
windows_8_DPT_screenshot.png
Windows XP:
windows_xp_DPT_screenshot.jpg

[athan_david]

I did continue with research and install Windows 7 and XP on virtual machines.
As I found Qt Quick 2.0 is using Open GL to draw elements (but on deployment machine, Open GL 2.0 at least is required) and Qt Quick 1.0 is using QPainter (correct me if I am wrong).
I did create project as Qt Quick 2.0 project and also did check if deployment machine does have support for Open GL 2.0 at least video card driver is up to date. Everything is good.
Just in case I did create the project as Qt Quick 1.0 on Windows XP inside virtual machine and tried again. Big surprise same issue.

Somehow on Windows 8 I did manage to recreate de bug using Qt. When I ran the app, I was complaining about QtQuick module, folder list module module and that QtObject cannot connect signals with slots because rootObject is null.
Through a bit research I found that QML_IMPORT_PATH enviroment variable might be the issue. I did try to set it but no effect at all.

If you know what's wrong please give me a hint.
Or if you know a tutorial or topic about how to deploy an app please share it.

Thanks for your effort!

[athan_david]

Hi again guys,

Today in a few hours I finally solved this problem and I thought about sharing what information I got meanwhile.
I was always getting a blank white window because the app was searching for some files but couldn't find them.
It was strange that on development machine everything was working. So I came with idea to add an "_" to the Qt's folder name (like "C:\Qt_"), then rerun app. Voila! blank white window. Revert renaming and start "digging" for a specific folder by adding the "_". I found that app was looking for these 2 folders:
C:\Qt\Qt5.1.1\5.1.1\mingw48_32\qml\QtQuick.2 -- http://qt-project.org/doc/qt-5.1/qtd...t-windows.html didn't mention about this
C:\Qt\Qt5.1.1\5.1.1\mingw48_32\qml\Qt -- why this folder? because I am using folderlistmodel.

Now my app with these files works charm:

Rename Files
   + platforms
      - qwindows.dll
   + Qt
      + labs
         + folderlistmodel
            - plugins.qmltypes
            - qmldir
            - qmlfolderlistmodelplugin.dll
   + QtQuick.2
      - plugins.qmltypes
      - qmldir
      - qtquick2plugin.dll
   - icon_rc_res.o
   - icudt52.dll
   - icuin51.dll
   - icuuc51.dll
   - libgcc_s_dw2-1.dll
   - libstdc++-6.dll
   - libwinpthread-1.dll
   - main.o
   - moc_qtquick2applicationviewer.o
   - moc_renamer.o
   - qrc_resource_file.o
   - Qt5Core.dll
   - Qt5Gui.dll
   - Qt5Network.dll
   - Qt5Qml.dll
   - Qt5Quick.dll
   - Qt5Script.dll
   - Qt5V8.dll
   - qtquick2applicationviewer.o
   - Rename Files.exe
   - rename.o

Rename Files
   + platforms
      - qwindows.dll
   + Qt
      + labs
         + folderlistmodel
            - plugins.qmltypes
            - qmldir
            - qmlfolderlistmodelplugin.dll
   + QtQuick.2
      - plugins.qmltypes
      - qmldir
      - qtquick2plugin.dll
   - icon_rc_res.o
   - icudt52.dll
   - icuin51.dll
   - icuuc51.dll
   - libgcc_s_dw2-1.dll
   - libstdc++-6.dll
   - libwinpthread-1.dll
   - main.o
   - moc_qtquick2applicationviewer.o
   - moc_renamer.o
   - qrc_resource_file.o
   - Qt5Core.dll
   - Qt5Gui.dll
   - Qt5Network.dll
   - Qt5Qml.dll
   - Qt5Quick.dll
   - Qt5Script.dll
   - Qt5V8.dll
   - qtquick2applicationviewer.o
   - Rename Files.exe
   - rename.o

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On deployment "dig" method works!

Chris, Thanks a lot for your help!

[JaegerBomb]

I have been working a similar issue myself, and I'm not sure if it's QtQuick 2.0 related or not. Right now I can run stand alone on my development machine... however, I am using VirtualBox to run another Windows 7 32 Bit machine, and when I run the application there, it crashes. This is one step more than if the plugin dlls aren't loaded... at that point I simply get a white box (as does everyone else who doesn't have the plugins loaded and in the right spot).

I'm curious if anyone else has had this behavior? It's completely repeatable with a mingw or visual studio build. I haven't tested 64 bit as of yet, but I'm going to.

I'm using the openGL-desktop build, so I'm assuming (hopefully) that ANGLE isn't the problem. Or maybe openGL is the problem? Has anyone else been able to successfully run this scenario?

1) Qt 5.2.0 - OpenGL - MingW4.8.6 or visual studio 2010
2) Windows 7 32 bit virtual box machine
3) QtQuick 2.0

Crashes every time - with no warnings or output.

Thanks,
JaegerBomb