Post your code. That should work (if I remember my syntax correctly).
Viggy
Thread: I have a question on extern "C"  |
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Started 1 month, 2 weeks ago by EnthusiasticNewbie
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hello
I have a question..
I realized that when I compiled and made export functions in dll with 'extern "C" __declspec(dllexport)', function names didn't include underscores in front of their name.
but I heard that symbols of c functions should include underscores..
is it a just a feature of Visual C...
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Other posts in this thread:
MrViggy replied 1 month, 2 weeks ago
Size: 91 bytes
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VijayDandur replied 1 month, 1 week ago
Dear friend,
By adding this " __declspec(dllexport) " statement indicates that the function is to be exported , and __declspec is a standard calling convention. Thats all , it wont add and "Underscores" during function decoration.
What Extern "C" means , follow the "C" name decoration standards, Which doesn't add any extra characters in function decoration.
I Think...
Size: 497 bytes
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Igor Vartanov replied 1 month, 1 week ago
Quote:
I heard that symbols of c functions should include underscores..
. . .
Even in import and export sections(in EXE , DLL), the function name doesn't contain underscores in front of its name.
You're missing the diffeence between function symbol and function export name. Symbol is a name used internally by linker . Export is a name ...
Size: 3,834 bytes
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Igor Vartanov replied 1 month, 1 week ago
Let's see another case, a bit different comparing to the previous one.
Code:
// 23.cpp
extern "C" void foo() {}
Code:
; 23.def
LIBRARY 23.dll
EXPORTS
oops = foo ; here's the trick
Code:
cl 23.cpp 23.def /link /dll /map:23.map /out:23.dll
Code:
23
Timestamp is 4af18d73 (Wed Nov 04 17:19:31 2009)
Preferred load address is ...
Size: 3,645 bytes
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Igor Vartanov replied 1 month ago
Code:
0000000600: 20 20 20 20 20 20 31 32 │ 35 37 39 36 33 38 34 34 1257963844
0000000610: 20 20 20 20 20 20 20 20 │ 20 20 20 20 20 20 30 20 0
0000000620: 20 20 20 20 20 20 33 32 │ 20 20 20 20 20 20 20 20 32
0000000630: 60 0A 00 00 FF FF 00 00 │ 4C 01 44 01 FB 4A 0C 00 `◙ яя L☺D☺ыJ♀
0000000640: 00 00 00 00 08 00 5F 66 │ 6F 6F 00 32 33 2E 64 6C ◘ ...
Size: 1,029 bytes
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EnthusiasticNewbie replied 1 month ago
Thanks
and thanks for my another question on ReadProcessMemory too !
Size: 167 bytes
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