CODEWITHSUNDEEP
winapidll
Devin Yu
Devin Yu

Reputation: 11

Why does not the second parameter of GetProcAddress(HINSTANCE,LPCSTR) identify the function name? Why does something( "_Z6 * v" ) more added?

/* This is part of code copied from http://www.cplusplus.com/articles/48TbqMoL/. */

//The functions declared in *.dll source code.

DLLAPI std::unique_ptr<Base> getObj(void);
DLLAPI std::string getName(void);

//The code to import functions from loaded library( which is named temp). What is "_Z6","v" in "_Z6getObjv"?

typedef std::unique_ptr<Base> (__cdecl *ObjProc)(void);
typedef std::string (__cdecl *NameProc)(void);

ObjProc objFunc = (ObjProc)GetProcAddress(temp, "_Z6getObjv");
NameProc nameFunc = (NameProc)GetProcAddress(temp, "_Z7getNamev");

Upvotes: 1

Views: 139

Answers (1)

Anders
Anders

Reputation: 101756

How the exported functions are named is compiler specific, see name mangling for more information. (_Z* is probably GCC v3+)

If you are building some sort of plug-in system you should have a public ABI with fixed function names. You can use a .DEF file to control the exported names.

With the Microsoft C/C++ toolchain you can also export a unmangled name with EXTERN_C __declspec(dllexport) int __cdecl MyFunc(long parm1) { return 0; }

Use Dependency Walker to see what your functions are actually exported as.

Upvotes: 3

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