函数名称与 windows.h 中的函数冲突

Question

将我自己制作的库从 Macintosh 移植到 Windows，看起来我遇到了 Windows 中的预定义符号：

[build] In file included from C:/msys64/mingw64/include/windows.h:72,
[build]                  from C:/Users/ken/Desktop/Drawbox/Library/Win/Drawbox.Win.cpp:31:
[build] C:/msys64/mingw64/include/winuser.h:3766:29: error: ambiguating new declaration of 'HICON__* GetCursor()'
[build]  3766 |   WINUSERAPI HCURSOR WINAPI GetCursor(VOID);
[build]       |                             ^~~~~~~~~
[build] In file included from C:/Users/ken/Desktop/Drawbox/Library/Win/Drawbox.Win.cpp:15:
[build] C:/Users/ken/Desktop/Drawbox/Library/Drawbox.h:559:5: note: old declaration 'int GetCursor()'
[build]   559 | int GetCursor();
[build]       |     ^~~~~~~~~

嗯，我真的不想要 Windows 定义的那个，我很乐意将它隐藏在我定义的那个中。所以我尝试了：

#define GetCursor() GetCursorX()
#include <windows.h>
#include <mmsystem.h>
#undef GetCursor

但是不，这会让编译器更加不高兴：

[  6%] [32mBuilding CXX object CMakeFiles/TestProgram.dir/Library/Win/Drawbox.Win.cpp.obj[0m
[build] In file included from C:/msys64/mingw64/include/windows.h:72,
[build]                  from C:/Users/ken/Desktop/Drawbox/Library/Win/Drawbox.Win.cpp:32:
[build] C:/msys64/mingw64/include/winuser.h:3766:43: error: macro "GetCursor" passed 1 arguments, but takes just 0
[build]  3766 |   WINUSERAPI HCURSOR WINAPI GetCursor(VOID);
[build]       |                                           ^
[build] C:/Users/ken/Desktop/Drawbox/Library/Win/Drawbox.Win.cpp:31: note: macro "GetCursor" defined here
[build]    31 | #define GetCursor() GetCursorX()

这是可行的，还是我只是坚持重命名我的函数以在 Windows 上工作？

Answer 1

答案：windows.h 中定义的许多函数实际上都是宏，它们解析为带有后缀的某些相关名称。因此，如果您尝试重新定义其宏，windows.h 会非常不高兴，但之后取消定义它们却可以正常工作：

#include <windows.h> 
#include <mmsystem.h>
#undef GetCursor

工作起来很有魅力。