Shared Library: Import and export simultaneously ?

[huckfinn]

Hello ,
I have a solution which contains of several projects

!http://img705.imageshack.us/img705/1500/sharedn.png(Architecture)!

as you can see.
There is the main project which includes the main.exe.
Then I have a few shared.dll libraries, which have several functionalities.
Furtheron, I plan to separate common used functions into other shared dll's (util.dll's), see third layer.

• Q_DECL_EXPORT must be added to the declarations of symbols used when compiling a shared library.
• Q_DECL_IMPORT must be added to the declarations of symbols used when compiling a client that uses the shared library.

Since my shared.dll's should be compiled as a shared library, so I have set the macro Q_DECL_EXPORT
Furtheron, my shared.dll's are compiled as a client that uses the shared library (util.dll), so I have to set the Q_DECL_IMPORT macro?

Any suggestions? Are there any suitable possibilities..?

Cheers Huck

[EDIT: fixed image link, Volker]

[cincirin]

In your dll project file define something like this:
@
#define YOUR_LIBRARY
@

then in dll public header, define something like this:
@
#if defined(YOUR_LIBRARY)

define YOUR_PUBLIC_DEFINE Q_DECL_EXPORT

#else

define YOUR_PUBLIC_DEFINE Q_DECL_IMPORT

#endif
@

Then every class, function or varibale that you want to be exported, must pe preceded by YOUR_PUBLIC_DEFINE

For example:
@
YOUR_PUBLIC_DEFINE yourClass{ ... }
YOUR_PUBLIC_DEFINE void yourFunnction() {...}
@

[edit] I wanted to say project preprocessor defines, and not define YOUR_LIBRARY in header file
So if you use qmake, in project file write
@
DEFINES += YOUR_LIBRARY
@
In VC, goto in project settings, C++ -> Preprocessor -> Preprocessor definitions

[dangelog]

See http://doc.qt.nokia.com/stable/sharedlibrary.html for hints.