从C应用程序中使用Qt库 [英] Use a Qt library from a C application

问题描述

有没有办法写一个Qt库，这样我就可以使用它（静态链接被罚款）在C应用程序？
我的C code是巨大的，旧的，不会转换为C ++没有工作的过多的。我这样说是因为其他类似的问题似乎回答只是让你的C code Qt的应用程序。这是不是一种选择。
我希望我可以写一个Qt库，并在某种程度上，让它从C（东西QLibrary文档中提到的）呼吁建立它。

Is there a way to write a qt library such that I can then use it (statically linked is fine) in a C application? My C code is huge, old and will not convert to C++ without an inordinate amount of work. I say this as other similar questions seem to answer "just make your C code a Qt app". That's not an option. I hope I can write a qt library, and build it in a way that lets it be called from C (something alluded to in QLibrary documentation).

符号必须导出为一个C
  从库函数
  解析（）工作。这意味着该
  功能必须被包裹在一个外部
  C块，如果库是编译
  用C ++编译器。在Windows中，这
  还需要使用DLLEXPORT的
  宏;看到细节解析（）
  这是如何实现的。

The symbol must be exported as a C function from the library for resolve() to work. This means that the function must be wrapped in an extern "C" block if the library is compiled with a C++ compiler. On Windows, this also requires the use of a dllexport macro; see resolve() for the details of how this is done.

有人能确认/否认，我能做到这一点，让我知道我有多么QT可以把在图书馆？
我不需要一个GUI，但想用一些SQL处理。

Can someone confirm/deny that I can do this, and let me know how much "qt" I can put in the library? I don't need a GUI but would like to use some of the SQL handling.

干杯

迈克

推荐答案

您可以把尽可能多的Qt在如你所愿，包括完整的UI功能的库。问题的症结，既然你想从C code访问它，您必须提供自己的接入功能和你的C功能将被限制为您提供力所能及的访问级别。

You can put as much Qt in a library as you wish, including full UI capability. The rub is that since you want to access it from C code, you must provide your own access functions and your C functionality will be constrained to whatever level of access you provide.

您甚至可以通过C和C之间的Qt对象指针++，但你需要扔东西，C能编译 - 无论是无效* 或preferably您自己的新类型定义（如 C_QString * ）。至C code这些指针将是不透明的，但他们仍然是有效的。

You can even pass Qt object pointers between C and C++ but you'll need to cast them into something that C can compile -- either void * or preferably your own new type definition (such as C_QString *). To C code these pointers will be opaque, but they'll still be valid.

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