错误 C2733 不允许重载函数“函数”的第二个 C 链接
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error C2733 second C linkage of overloaded function 'function' not allowed
提问by swcraft
I am trying to compile old cpp MFC project in Visual Studio 2010 pro.
我正在尝试在 Visual Studio 2010 pro 中编译旧的 cpp MFC 项目。
It uses dll which is compiled using Labview, and I am adding this information because I don't know what is causing the error message..
它使用使用 Labview 编译的 dll，我正在添加此信息，因为我不知道是什么导致了错误消息..
The error messages show up on multiple functions, all same error type.
错误消息显示在多个函数上，所有相同的错误类型。
error C2733: second C linkage of overloaded function 'function name' not allowed.
the 'function name' includes: 'StrCatW', 'StrCmpNW', 'StrCmpW', 'StrCpyNW', and 'StrCpyW'
“函数名称”包括：“StrCatW”、“StrCmpNW”、“StrCmpW”、“StrCpyNW”和“StrCpyW”
I found a similar caseon the web.
我在网上找到了一个类似的案例。
Although the suggestion in the link didn't solve in my case and I still see the same error messages.
尽管链接中的建议在我的情况下没有解决，但我仍然看到相同的错误消息。
Thanks in advance for anyone trying to help.
预先感谢任何试图提供帮助的人。
回答by anatolyg
I have no experience with MFC, anyway i'll try to answer.
Such error message appears when an extern "C"function is declared with a different set of parameters. For example:
我没有使用 MFC 的经验，无论如何我会尝试回答。当extern "C"使用一组不同的参数声明函数时，会出现此类错误消息。例如：
extern "C" int myfunc(int);
extern "C" int myfunc(char);
In your case, the two declarations are probably related to char*:
在您的情况下，这两个声明可能与char*：
extern "C" char* StrCatW(char*, char*);
extern "C" wchar_t* StrCatW(wchar_t*, wchar_t*);
Try turning off Unicode support in your solution: i guess, if the dll is really old, it somehow declares StrCatWwith char*arguments, conflicting with some other declaration.
试着在你的解决方案关闭Unicode支持：我想，如果DLL是真的老了，它在某种程度上声明StrCatW与char*论点，与其他一些申报冲突。
If that doesn't help, turn on preprocessed output (/Ecompiler switch, as far as i recall) - it will output a very large file, so look for StrCatWin it, maybe it will give you some clue on what is going on.
如果这没有帮助，请打开预处理输出（/E编译器开关，据我所知）-它将输出一个非常大的文件，因此请StrCatW在其中查找，也许它会给您一些有关正在发生的事情的线索。
