[Qt-interest] system crash when using external dll

[Vincent Cai]

Dear all,

         I have an algorithm which is developed in pure C language and deployed as dll in Qt Creator.

         And I create an application project which will use the algorithm:

l  If I add all the source files of the dll into application project, the application run well
in application.pro

    SOURCES += D:/Alg_src/a.c \

    D:/Alg_src/b.c \

    D:/Alg_src/c.c \

    D:/Alg_src/d.c \

    D:/Alg_src/e.c \

l  If I try to use the dll instead of source code, the system always crash at somewhere that calling the function in dll, but it is not the first calling;
I confirmed that I have copied the dll to the same directory of application.exe, and when running, the application.exe has loaded the dll and access some symbols in the dll successfully
in application.pro
LIBS+=$$quote(E:/xxx_perforce/CFT members/xxx/Projects/TSA/Qt/TSA-build-desktop/Alg/AlgTSA/debug/AlgTSA.dll)

Any difference between using source code and using dll?
Could anybody help?

Thanks,
Vincent.

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