C++ Visual Studio：使用 pragma 注释链接
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C++ Visual Studio: linking using pragma comment
提问by user1612986
I came across a piece of code which uses #pragma comment(lib, "libraryname").
我遇到了一段使用#pragma comment(lib, "libraryname") 的代码。
Why this type of usage as opposed to just linking the library from the properties menu? In what situations is this usage called for? I am in windows using C++ Visual Studio 2010.
为什么要使用这种类型的用法而不是仅从属性菜单链接库？在什么情况下需要这种用法？我在 Windows 中使用 C++ Visual Studio 2010。
It would be nice to see an example which calls for this type of usage.
很高兴看到一个需要这种用法的示例。
回答by Alex F
The library writer can place a #pragma comment(lib, ...)command in the public header (.h) file. In this case, the client doesn't need to add this library to the linker dependencies list. By including an h-file in the program, the client is automatically linked to the required library.
库编写器可以#pragma comment(lib, ...)在公共头 (.h) 文件中放置命令。在这种情况下，客户端不需要将此库添加到链接器依赖项列表中。通过在程序中包含一个 h 文件，客户端会自动链接到所需的库。
回答by Luchian Grigore
Classic example - linking against different versions of the library:
经典示例 - 链接不同版本的库：
#if CURRENT_VERSION >= 10
#pragma comment(lib, "thirdPartyLibV2.0.lib")
#else //version < 10
#pragma comment(lib, "thirdPartyLibV1.0.lib")
#endif
回答by Blindy
It's contained in the sense that all it takes is including the header file for the associated library to be automatically pulled in. You can even do #ifdef..#endifmagic to conditionally bring in the right library based on your environment.
从某种意义上说，它所包含的所有内容都包括要自动引入的关联库的头文件。您甚至可以#ifdef..#endif根据环境有条件地引入正确的库。
Not everyone is going to be using your MSVC project when starting a new project from scratch, simply being able to #includeand have it work is the sign of a well written library.
当从头开始一个新项目时，并不是每个人都会使用你的 MSVC 项目，仅仅能够#include并让它工作就是一个写得很好的库的标志。
