如何在c / c ++中使用某些特定的dll？

Question

Like the msvcr70/msvcr80/msvcr90.dll , what's the code like to instruct the linker to link to one of them dynamically?

Or has that anything to do with c/c++ ,but cmake ?

Answer 1

The specific examples you give happen to be DLLs that are usually linked through manifests and the side-by-side, at least when building applications (with the correct project settings) from Visual Studio. Why are you trying to instruct the compiler to link them by code?

The most often-used way to link to a particular DLL is when you have the lib for the DLL available, and then to use the pragma

 #pragma comment(lib, "<library name>")

Answer 2

链接时指定一个.lib文件，并且匹配的.dll将在运行时使用，因此（例如）如果要使用msvcr70.dll，则需要与msvcr70.lib链接。

Answer 3

In general, the C/C++ runtime you link against is dependent to the version of VisualStudio you are using. (msvcr80.dll -> VS2005, msvcr90.dll -> VS2008 etc.)

Some deeper insight on how this works and some tricks to work araoud this you can read up in this blog post .

Answer 4

eh, surely you want to first understand DLLs/linking... http://www.infernodevelopment.com/how-create-dll-c-using-run-time-dynamic-linking

the question as written is not answerable

Note: not sure what you mean with Cmake, but you can easily specify link libraries in your CMakeLists.txt file... the exception being the DLLs you note, because they are platform-dependent. You'd need something in the CMake script to check versions of MSVC.

Why would you want to link to an older run-time though, Vista onward come with the VC9 run-time, and if someone is using XP you can just give them the 'redistributable package' for VS2008/2010...