Runtime problem in Release mode

[squidge]

Well, what can I say? "Unable to find entry point" means exactly that - that it can't find that particular function in the DLL file. Since Qt ships with pretty much every function available in the DLL, the only explanation is that the system is trying to use a custom-compiled QtCore DLL which doesn't have the function that the program needs. If the function wasn't in the DLL, the linker would complain when you ran it, as it wouldn't be able to find the function in the dynamic version of the .a file either.

Maybe you should host your executable which doesn't work somewhere for someone else to test. If it works on there PC, then it's definitely a DLL issue.

[wysota]

Since Qt ships with pretty much every function available in the DLL, the only explanation is that the system is trying to use a custom-compiled QtCore DLL which doesn't have the function that the program needs.

Or that the function is at different offset in the library which may happen when trying to run the application against a different version of the library it was linked against (i.e. running against 4.7 while building against 4.6). Which may happen exactly when you take the dll from qtsdk\bin\ instead of qtsdk\qt\bin as already mentioned. Maybe the export library is broken?

[john_god]

Maybe the export library is broken?

can you explain this ?
Here is a exe from a empty project, if someone could test it, thank you.

[rittchat]

Hi,

The attached exe file in XP producing same error. I also tried Win7. Same thing had happened as mentioned by benelgiac. It is running fine in debug mode. In release mode only qt creator can run the exe . But in Xp nothing is running .

regards
rittchat

[wysota]

can you explain this ?

What exactly? If the export library is incorrect then the resulting executable will not link against an incompatible dll during runtime.

[ericV]

When I began programming with QT earlier this year I ran into the same Problem.

When you run from Creator everything works fine. But when you run the EXE it complains about missing DLL(s).

I think this has something to do with the build configuration... (have not found how to solve it here)

But, i found that if you copy the Dlls into the applicationfolder it will link and run... You might need more than 1 dll, depending on what Qt Modules your programm uses.

For me it was necesary to copy following Files (Application is a Custom rich Text Editor)

mingwm10.dll
msvcrt.dll
QtCore4.dll
QtGui4.dll

Somewhere I found an Article that lead me to this solution including a small app called "Depends" which will help you find out which dlls your exe needs.

I hope this helps...

Eric

[john_god]

What exactly?

I dont know what a export library is, is it the dll ? I deleted the previous Qt version before installng the current one, so there shouldnt be older dll to cause caos.

Maybe the export library is broken?

How can I fix it?

[squidge]

I dont know what a export library is, is it the dll ? I deleted the previous Qt version before installng the current one, so there shouldnt be older dll to cause caos.

You should search your system to ensure that is the case. Any application can install the Qt libraries and modify your system search path.

[wysota]

I dont know what a export library is, is it the dll ?

No. It has a "lib" extension for MSVC libraries and "a" for MinGW ones.

I deleted the previous Qt version before installng the current one, so there shouldnt be older dll to cause caos.

If you have Qt SDK installed, you have at least two versions of Qt in your system.