Compiling TagLib into Qt C++ Project on Windows_问答_开发者

I am currently trying to make the move from C# and break free from my platform boundaries by using Qt / C++.

I was using TagLibSharp in my old project, but I'm now trying to use the original C++ source found here:

http://developer.kde.org/~wheeler/taglib.html

I am in a world of hurt trying to compile this into my application. Most of this Linux based C++ is gibberish to me and I don't know how to properly include this library into my project with Qt. I'm using Qt Creator for the bulk of my work (everything I possibly can).

Can anyone please point me to some helpful tutorial or guides? Anything to help me understand what I am even doing with this source would be greatly appreciated. I have a very thorough understanding of C# and Windows programming, but I don't exactly have a good handle on what I'm doing with these types of open source projects.

Thanks!

EDIT - THE ANSWER IS HERE I decided to post another question that was a bit more refined for it.

Compiling static TagLib 1.6.3 libraries for Windows

Some older edits...

I now have TagLib compiled with Qt, but am running into "Undefined reference" errors.

*.pro

INCLUDEPATH += ../$${TARGET}/taglib-win32
LIBS += -L"..\\$${TARGET}\\taglib-win32"
LIBS += -llibtag #It seems to want this to be a *.dll, not a *.a?
DEFINES += TAGLIB_NO_CONFIG

*.cpp

#include <tag.h>
#include <fileref.h>
...
//None of these work, even though they are similar to examples given in TagLib source.
TagLib::FileRef f("03.flac");
TagLib::String test = f.tag()->album();
TagLib::FileName *n = new TagLib::FileName("test");
TagLib::FileRef *f = new TagLib::FileRef();

Here are some examples of the exact errors:

./debug\mythread.o:C:\Users\jocull\Documents\My Dropbox\Code\QT\QtTrayTime-build-desktop/../QtTrayTime/mythread.cpp:20: undefined reference to `_imp___ZN6TagLib7FileRefC1ENS_8FileNameEbNS_15AudioProperties9ReadStyleE' 
./debug\mythread.o:C:\Users\jocull\Documents\开发者_Go百科My Dropbox\Code\QT\QtTrayTime-build-desktop/../QtTrayTime/mythread.cpp:21: undefined reference to `_imp___ZNK6TagLib7FileRef3tagEv' 
./debug\mythread.o:C:\Users\jocull\Documents\My Dropbox\Code\QT\QtTrayTime-build-desktop/../QtTrayTime/mythread.cpp:42: undefined reference to `_imp___ZN6TagLib6StringD1Ev' 
./debug\mythread.o:C:\Users\jocull\Documents\My Dropbox\Code\QT\QtTrayTime-build-desktop/../QtTrayTime/mythread.cpp:42: undefined reference to `_imp___ZN6TagLib7FileRefD1Ev' 
collect2: ld returned 1 exit status

Command line steps using g++ (Mac/Linux)

./configure --enable-shared=false --enable-static=true
make
??? No *.a or *.lib files created

If you're new to C++ programming there are several issues you have to grasp to accomplish your task:

Source files (*.cpp) contain the actual source code, while header files (*.h) just declare what's inside a source file. You have to include all headers in your source files that use classes/functions/variables from other source files.
You need to understand how the preprocessor works. AFAIK C# does not have one. The wikipedia article should give you a good overview: http://en.wikipedia.org/wiki/C_preprocessor
Assuming you want to use TagLib as a dynamic library you have to create a Qt project for just building TagLib as a .dll (.pro file directives TEMPLATE=lib, CONFIG+=dll)
If you want to create a dynamic library out of a source files you have to mark the functions you want to use later as exportable. In TagLib this is done by defining the preprocessor macro MAKE_TAGLIB_LIB (in your taglib .pro file: DEFINES+=MAKE_TAGLIB_LIB)
Then you have to build the dynamic library (in your pro file: TEMPLATE=lib, then adding all sources and headers of taglib). When you use gcc this will result in two files TagLib.dll and libTagLib.a.
When building your application you have to include the header files of TagLib in your source and tell the compiler about the library (in your .pro file: LIBS+=libTagLib.a)
In your code you simply include the header file from your library. Let's say you want to use TagLib::Tag in your source file, then you must #include <taglib/tag.h>; You also have to tell the compiler (to be precise: the preprocessor) where it can find the taglib directory. In your .pro file you do this by adding INCLUDEPATH+=/path/to/taglib.

These are the big points and are not an in-depth explanation of what you have to do. Please ask more detailed questions if you have a problem when realizing this points.

For more information look at the qmake manual: http://doc.trolltech.com/4.6/qmake-variable-reference.html#libs