C++ 如何摆脱 VC++ 链接器中的 __imp__ 前缀？
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How can I get rid of the __imp__ prefix in the linker in VC++?
提问by BeeBand
I'm using libcurl and am getting the following sort of linker errors in VC++ 10.
我正在使用 libcurl 并且在 VC++ 10 中遇到以下类型的链接器错误。
1>main.obj : error LNK2019: unresolved external symbol __imp__curl_easy_strerror referenced in function "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl curl_httpget(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?curl_httpget@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@ABV12@@Z)
How can I get rid of that impprefix in front of the function name? I am linking to the right lib, right path etc.
我怎样才能去掉函数名前面的那个imp前缀？我正在链接到正确的库、正确的路径等。
回答by Suma
The __imp__prefix appears whenever you are linking to a DLL. It does not appear when linking to statically linked libraries. Most likely the code is generated to be linked against a DLL import lib, but you have linked it with a static lib instead.
在__imp__当你链接到一个DLL出现前缀。链接到静态链接库时它不会出现。生成的代码很可能是链接到 DLL 导入库，但您已将其链接到静态库。
The prefix is added when you mark the imported function with __declspec(dllimport)- make sure your imports are not using this when not linking against a DLL.
当您标记导入的函数时添加前缀__declspec(dllimport)- 确保您的导入在不链接 DLL 时不使用它。
回答by Kostya Trushnikov
You have to add CURL_STATICLIBto Preprocessor Definitionsat the properties of your projects in MSVC
您必须在 MSVC 中项目的属性中将CURL_STATICLIB添加到预处理器定义中
回答by Alfishe
If using wizard generated projects - check "Runtime settings" value in project properties -> C/C++ -> Code Generationsection.
如果使用向导生成的项目 - 检查部分中的“运行时设置”值project properties -> C/C++ -> Code Generation。
By default it usually has "Multithreaded DLL" value. You need Multithreaded /MT and Multithreaded Debug /MTd values.
默认情况下，它通常具有“多线程 DLL”值。您需要多线程/MT 和多线程调试/MTd 值。
回答by Mahmoud Al-Qudsi
You are using a header file that defines the function prototype with the specifier evaluating to __declspec(dllimport)
您正在使用一个定义函数原型的头文件，其中的说明符评估为 __declspec(dllimport)
You need to either redefine the statement that is evaluating to this (set it to nothing), or use a different header file altogether.
您需要重新定义对此进行评估的语句（将其设置为空），或者完全使用不同的头文件。
Typically you'll see code like this:
通常你会看到这样的代码：
#ifdef FOO_EXPORTS
#define DLLSPEC __declspec(dllexport)
#else
#define DLLSPEC __declspec(dllimport)
#endif
...
DLLSPEC bool foo(int bar);
Compiling the project with FOO_EXPORTS defined will use one mode and without it will use the other.
使用定义的 FOO_EXPORTS 编译项目将使用一种模式，没有它将使用另一种模式。
回答by CKE
As Suma mentioned, <your_library>.dllis normally accompanied by <your_library>.lib. Therefore if you get such error messages like
正如 Suma 所提到的，<your_library>.dll通常伴随着<your_library>.lib. 因此，如果您收到此类错误消息，例如
Error LNK2019 unresolved external symbol __imp__<your_symbol> referenced in function ...
Error LNK2019 unresolved external symbol __imp__<your_symbol> referenced in function ...
it is highly recommended to check the Linker settings of your project.
强烈建议检查项目的链接器设置。
In Visual Studio, just go for your project to
在 Visual Studio 中，只需将您的项目
Properties -> Linker -> General
and check under entry Additional Library Directories, if the path to <your_library>.libis defined there. If not, just add it.
并在 entry 下检查Additional Library Directories，是否在<your_library>.lib那里定义了路径。如果没有，只需添加它。
Then check and define on
然后检查并定义
Properties -> Linker -> Input
under entry Additional Dependenciesthe probable missing <your_library>.lib.
在条目Additional Dependencies下可能失踪<your_library>.lib。
The error message should disappear now.
错误消息现在应该消失了。
Hope it helps?
希望能帮助到你？
