Qt4 Program Crashing Unless SDK Installed - windows

I've written a Open Source program that I've released as GPL built using the Qt4 LGPL SDK. This program has the ability to search an optional Sqlite3 database for data.
Here is what is making me lose my mind. I compile the program on the development machine. When I try to run it, I can errors about missing DLLs. I copy those dlls into the same directory as the executable and it now works fine ( mingwm10.dll, libgcc_s_dw2-1.dll, QtCore4.dll, QtSql4.dll, QtGui4.dll ), including the database search.
Now, if I copy that folder with the executable and the DLLs to a new machine that has not had the SDK installed on it, it runs fine until I try to search. As soon as I hit the search button, I can the following error:
Title: Microsoft Visual C++ Runtime Library
Runtime Error!
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
I then download and install the SDK, doing nothing else, I can now run the program and search the sqlite3 file just fine!
What magic am I missing?
P.S. Both machines are freshly installed Windows XP systems.

You may have some libs or Qt plugins that are not deployed to the target machine. It most likely is the SQL driver plugin. Here's some info about it: http://doc.trolltech.com/latest/deployment-windows.html#qt-plugins
You'll need to copy the needed Qt plugins to a directory next to your executable. And add something like this in your main():
QApplication::addLibraryPath(QCoreApplication::applicationDirPath() + "/plugins");
(Edited link and added code)

I found the problem.
Stephen Chu was correct in that I was missing the sqlite driver. However, I can into more complications along the way.
The SDK comes with two sets of dlls. One set resides in $BASEDIR/bin and the other in $BASEDIR/qt/bin. The former contains the dlls used by Qt Creator, while the latter are the dlls that you want to ship with your executable.
I needed to take the sqlite plugin ( qsqlite4.dll ) and copy it to APP_DIR/sqlplugins. My problem was I was using the wrong qsqlite4.dll file.
A big thanks to everyone who contributed to this question.
For future reference, this issue was also discussed here: http://www.qtforum.org/article/34639/qt4-program-crashing-unless-sdk-installed.html

Related

"flutter run -d windows --release" works but executable doesn't

I do have a strange behavior with a flutter package I am building. It uses FFI to integrate a custom-made c++ library.
When I run flutter run -d windows --release the code starts and I do have the window with the code running.
However, when I go to the directory where the executable is stored and I run it, the program starts but the library is not loaded. I do see also that when I run flutter test, it complains that it cannot load the library. I have checked that the dll's needed are there using dependenciesGUI.exe and it seems that everything is fine, at least on my side. I do see however that within kernel32.dll I am missing ext-ms-win-oobe-query-l1-1-0.dll.
I am using Visual Studio 2022 with the x64 configuration.
Any idea on what could be the issue? For me it is VERY puzzling to be able to run the software through flutter but not with the executable directly.
Thanks!
Yours,
Pi-r
EDIT:
I compared my package with a fresh package built with flutter. With a fresh package, the behavior is the one expected: I can have the program run normally or with flutter run.
I compared the libraries of the clean package with the ones linked in my package. They are the same (with the same missing dlls which do not seem to pose an issue).
I also checked that the exported functions I needed where present -> It is the case.
The only difference I can see is that using flutter run adds a series of libraries to the path. Has I am a Linux person, I do not know of a tool that could be used to detect what is the missing library. I am open to write a separated c++ code that would load the library if it could help me identify what is the issue... ANY tips/tricks would be greatly appreciated :)
I finally found the issue I had and it is related to a different behavior under Linux and under Windows (as you will guess, I am a Linux person).
When compiled under Linux, I can force the compiler to link multiple libraries relatively to my main library. I discovered that this is not the case under Windows. Either the dlls are in the executable folder or in the Path.
For the sake of code clarity, my package uses two different libraries. Library A, which is compiled from flutter with the ffi package, called library B. First the second library was in the asset folder and with the relative linking of Linux, it was working perfectly. But it did not work under Windows until I explicitly copied the two in the same directory of the executable.
The solution was then to ensure that both libraries are copied correctly in the directory of the flutter executable. This can be done easily if you add the dependent libraries to the bundle variable in the CMakeLists.txt of the package.
However, this doesn't work when you do the testing (flutter test). As the bundle mechanism seems to be not propagated to the test function. Therefore here, the only solution is to copy the dependent libraries to the root directory of the source code :vomiting_face:
I must point out that this is only the case under Windows, for Linux, it works out of the box...

Qt 5.2.1 with MinGW 4.8 32bit wont run applications on Windows 8.1

Using Qt Creator 3.0.1, Qt 5.2.1, MinGW 4.8 32bit on Windows 8.1 64bit, I am able to build an application but not run it.
When trying to debug the application (new clean project), the output tells me
This application failed to start because it could not find or load the
Qt platfor plugin "windows". Available platform plugins are: minimal,
offscreen. Reinstalling the application may fix this problem.
follow by a
Runtime Error!
Program C:\Qt\Qt5.2.1\test\debug\test.exe
This application requested the runtime to terminate in an unusual way
etc...
I tried adding the qwindows.dll's under my /debug/platforms/*.dll but no difference there.
Is my problem due to my Windows installation?
EDIT: After trying out #paulm's solution, putting the windows dll's inside plugins instead, nothing changes.
Dependancy Walker tells me that I miss
API-MS-WIN-CORE-KERNEL32-PRIVATE-L1-1-1.DLL
API-MS-WIN-CORE-PRIVATEPROFILE-L1-1-1.DLL
API-MS-WIN-SERVICE-PRIVATE-L1-1-1.DLL
EDIT2
After adding these DLL's (had to download them from here) and seing I had to change the name of one of the DLL's I downloaded from this site, I now get the new error
This application failed to start because it could not find or load the
Qt platform plugin "windows".
Available platform plugins are: minimal, offscreen
And not the following runtime error.
Since I had to go to external sources to get the Microsoft DLL's, doesn't this really points to something faulty with the Windows 8.1 DLL's?
EDIT3:
To clarify, in my \platforms I have
qminimal.dll
qmoffscreen.dll
qwindows.dll
whilst in my \plugins I copied the same DLL's.
All required steps are described on this page of the documentation. Check especially the "plugandpaint" example under "Creating the application package".
My guess is that you are missing the second one:
myapp.exe
platform/qwindows.dll
Qt5Core.dll
Qt5Gui.dll
Qt5Widgets.dll
And yes, dependency management on Windows is a pain. It should be part of the OS, instead, it's not, and you have to take care of everything yourself.

QBSDK Distribution for VB6 App

Ok, I went through great lengths but I finally got my integration to quickbooks working on my VB6 application. It works perfectly on my build machine. I actually installed the qbdsk11 on my build machine and worte and tested the code. The ONLY new reference in the project is the QBFC11.dll.
So, I added the QBFC11.dll to my innosetup, told it to do a regsvr on the dll, and hoped this was enough.
NOT.
First, during install, I get a failure to register the dll. Apparently, this DLL isnt meant to be registered?
But the .DLL was put in Windows System32, so I tried my program anyways...
NOPE. Doesnt work. I get a runtime 91, about an object variable not set. Which makes sense, if it cant create the object.
So, for grins, I moved a copy of the .DLL into the program folder, next to my executable.
Same thing. Runtime error 91.
So, i then grab the whole qbsdk11 installer and install it on this machine. I figure I can make it an additional download for people who want to use this extra functionality.
But no, even with the whole SDK installed, I still get the same runtime error.
I have not been able to find any CLEAR information on how to proceed. I'd prefer for this to be part of my base install. But apparently something still just isn't right.
What did I miss? How do I fix this? I don't even know what to try next.
If you're using QBFC11, you must install the QBFC11 redistributable components with your application. You can find instructions on how to do this in the QBSDK Programmer's Guide in the section titled Redistributing SDK Components With Your Application, subsection Using Installers and Merge Modules.
The most likely cause of the runtime error you're currently getting is the manipulation of the QBFC11.DLL that you did before you installed the SDK. I would start again with a clean OS image so that you can get the proper procedure down.

generated executable of Net-Snmp is not getting distributed

Actually I compiled a source file of Net-Snmp-5.7.1 version on windows system by using Visual Studio C++ (2008).Its working fine on that particular machine,but whenever I tried to take this compiled source & make it run on another windows system,Its given this error THE SYSTEM CANNOT EXECUTE THE SPECIFIED PROGRAM. Even though I am using Microsoft redistributed package on the target machine..Anyone who can help me on this,please help.I am looking desperately for your help.
ThankYou
net-snmp code has a manifest that specifies the version(s) and operating system. There are many conditional compilation code in source-code of net-snmp. Although this is not specific to net-snmp. Some DLLs cannot be found at another window machine that the reason for “ The system cannot executed the specified program”.READ HERE

qt lrelease windows binary?

can someone give a link to lrelease binary for windows?
I can't seem to find it everywhere.
I have a server app that translates the ui dynamically via web translate engine (like google translate) and translates the entries in the .ts file. Now I need to generate a .qm from .ts and return it to the client.
So I need to put the lrelease utility on the server. Don't want to install the whole qt framework. Just the .exe and maybe some depending .dll-s.
// UPDATE
Thanks for replies. I managed to get it working in Windows.
Same question, but looking for Linux (Ubuntu) binary.
How can I check just lrelease dependencies.
I know it is in the qt4-dev-tools package, but it depends on almost whole Qt.
So is there any way to check only the lrelease dependencies?
You could download e.g. [QT for VS 2008][1], install it on some machine and copy lrelease and the required DLLs (I'd assume QtCore and QtXml) from there to the server. I don't think you'll find up-to-date standalone binaries on the net.

Resources