VC的引用库文件为xxx.lib， GCC的为xxx.a， 通过比较两种库文件的格式，发现很相似。于是把xxx.dll，xxx.lib和xxx.h复制到Qt的project下，直接把xxx.lib改为xxx.a, 根据Qt的库名字的格式， 在xxx.a的前面加上lib， 即为libxxx.a。(The reference library file for VC is xxx.lib, and GCC is xxx.a. It is found to be very similar by comparing the format of the two library files. So xxx.dll, xxx.lib and xxx.h are copied to Qt project, and xxx.lib is changed to xxx.a. Lib is added to the front of xxx.a according to the format of Qt library name. That is libxxx.a.)