Integrating exiv2 with Qt

SGaist

Again, don't link against .dll.

Where is libexiv2.dll located on your computer ?

saitej

I have put it in a libs folder in the project directory.

When I import the libexiv2.dll.a via import external library in Qtcreator, It generates this in the .pro file. I have only added one line manually that is:

INCLUDEPATH += $$PWD/libs/exif/bin in the .pro file

Path of the dll:
$$PWD/libs/exif/lib/

SGaist

Then you need to add that path to the PATH environment variable in the Run part of the Project panel. Otherwise your application won't find the .dll at startup. WARNING don't modify your system's PATH, just the one for running your application in Qt Creator.

saitej

@SGaist

I have added the path in the run part.Right now, the run environment reads:

Use Build Environment and
Set EXIVPATH to C:\Users\Sai\Desktop\trial\exifdata\exifData\libs\exif\bin

Should I add this EXIVPATH somewhere else?

Thanks!

SGaist

Again: you have to add that path to the PATH environment variable. The loader doesn't care about EXIVPATH to find the .dll it needs.

saitej

Sorry!

I have now added in the Path variable. The error code has changed to 139

saitej

@SGaist said in Integrating exiv2 with qt:

Did you also check that you are using the same compiler everywhere ? That's pretty important on Windows.

I have compiled it using msys and mingw. I am not able to get the mingw32 version

I am using Qt installed from qt-opensource-windows-x86-mingw492-5.6.1-1.exe file.

SGaist

Do you mean that you get that error 139 at startup ?

saitej

Sorry for the late reply!
Yes

During startup program exited with code 0x0000c139

SGaist

AFAIK, it means that it fails to load a .dll Do you have other dependencies ?

saitej

most probably no .. coz i gave local/bin also as the path

SGaist

local/bin ? On Windows ?

saitej

Ya ... mingw installation path!!

SGaist

Just to rule out the obvious, can you copy the exiv2 .dll in the same folder as the application and check whether the application starts ?

saitej

@SGaist

Sorry for the late reply!!

Ya .. i have tried that already but gives the same error!

In the mean time I actually have tried many libraries and all are having same problem. So I guess there is a problem in either the build or the way of including the library. I will brief you exactly what I have done and the versions.

Build:

I have successfully build the source code in the qt project folder using --prefix option with msys terminal with mingw compiler.

mingw32-g++.exe (GCC) 5.3.0
mingw32-gcc-5.3.0.exe (GCC) 5.3.0

I am using Qt installed from qt-opensource-windows-x86-mingw492-5.6.1-1.exe
I have added mingw32-g++.exe (GCC) 5.3.0 as the compiler manually
I have added the external library (libexiv2.dll.a) in Qtcreator via Add Library external library and static mode.
I have also added to the PATH variable you have suggested.

The .pro reads this:

win32: LIBS += -L$$PWD/libs/exiv2build/lib/ -llibexiv2.dll

INCLUDEPATH += $$PWD/libs/exiv2build/include
DEPENDPATH += $$PWD/libs/exiv2build/include

It still gives me the error During startup program exited with code 0x0000c139.

Any suggestion on what might have gone wrong?

SGaist

Do I understand understand correctly that you are trying to run application with libraries built with two different versions of MinGW ?

saitej

No.

I have right now changed it to the same compiler by changing the kit

Also, I have used the dependency walker on the dll file and have found problems in these dependencies:

I have attached the dependencywalker image for the same:

SGaist

What image format is it ?

saitej

dependency walker

SGaist

Can you provide an image that is in a more mainstream format ?