Trouble with DLL address
dnewbie
run3 at myopera.com
Mon Jan 14 01:13:32 PST 2013
I have a DLL which exports a function GetFunction. GetFunction
returns a pointer to RealFunction. Now I want to run RealFunction
from my D program, but for some reason I get the wrong address.
Here is the code.
---- dll64.c -----
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
int __stdcall RealFunction(int a)
{
return a + 1;
}
typedef int (__stdcall *FuncPtr)(int);
FuncPtr __stdcall GetFunction()
{
return &RealFunction;
}
---- mydll64.def ----
LIBRARY mydll64.dll
EXPORTS
GetFunction
---------------------
build with MSVC64:
cl -c dll64.c -Fomydll64.obj
link /DLL /OUT:mydll64.dll mydll64.obj /DEF:mydll64.def
And this is the D program.
---- testdll64d.d ----
// dmd -m64 -c testdll64d.d -oftestdll64d.obj
// link /OUT:testdll64d.exe testdll64d.obj
import core.runtime;
import std.c.windows.windows;
import std.stdio;
alias extern(Windows) int function(int) FuncPtr;
int main(string[] args)
{
HMODULE dll = LoadLibraryA("mydll64.DLL");
FARPROC getFunction = GetProcAddress(dll, "GetFunction");
FuncPtr realFunction = cast(FuncPtr) getFunction();
writefln("dll address: %08x", dll);
writefln("GetFunction address: %08x", getFunction);
writefln("RealFunction address: %08x", realFunction);
writefln("RealFunction result: %d", realFunction(7));//<--
CRASH
return 0;
}
----------------------
Output:
dll address: 180000000
GetFunction address: 180001020
RealFunction address: ffffffff80001000
<CRASH>
BTW, this works:
FuncPtr realFunction = cast(FuncPtr) (getFunction() &
0x00000000ffffffff | cast(size_t) dll);
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