How to find address of variable using getprocaddress()?

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C

Windows

Hi, i want get address by using getprocaddress. but getting error. please tellme how it is possible.

Posted 4-Mar-14 17:52pm

gupta_abha

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Comments

[no name] 4-Mar-14 23:56pm

What type of error? Please give your method to scan.

Member 10017719 4-Mar-14 23:59pm

Can u explain your method

gupta_abha 5-Mar-14 0:23am

#include <windows.h>
#include <stdio.h>
#include <string.h>
extern "C" {
__declspec(dllexport) char d[];
}

int main (void) {
char d[]="hello";

HMODULE hMod = GetModuleHandle (NULL);
char *pGlobal = (char*)GetProcAddress (hMod, d);

printf("%u%s",pGlobal,d);

return 0;
output: 0 hello

chandanadhikari 5-Mar-14 7:59am

what is the error message you are getting?

gupta_abha 5-Mar-14 8:05am

Iam not getting correct address. i got 0 for address

3 solutions

Solution 1

hi,
take help from this code example[^]
hope it helps !

Posted 5-Mar-14 2:00am

chandanadhikari

Comments

gupta_abha 5-Mar-14 8:07am

thanks but what is the mean of typedef int (__cdecl *MYPROC)(LPWSTR). i am not getting

chandanadhikari 5-Mar-14 8:40am

its a type definition; think you got baffled by complexity of the code ... if you want to know what is typedef then you can check http://www.functionx.com/cpp/keywords/typedef.htm

chandanadhikari 5-Mar-14 8:45am

please check if solution 2 works for you ... its from CPallini and its easier to understand :)

Solution 3

C++

printf("%u%s",pGlobal,d);

If you compile that line as 64 bit code, it will likely cut off the 64 bit pointer type to 32 bit. So it may be that the '0' you are seeing is just the upper 32 bits of the pointer rather than the (more meaningful) lower 32 bits.

If you want to print a pointer address using printf, use the format specifier %p, not %u! See http://www.cplusplus.com/reference/cstdio/printf/[^]

Posted 5-Mar-14 4:53am

Stefan_Lang

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CPallini · Accepted Answer · 2014-03-05T02:15:00

Solution 2

C++

#include <Windows.h>
#include <stdio.h>

extern "C" 
{
    __declspec(dllexport) char d[] = "hello world";
}

int main (void) 
{
  HMODULE hMod = GetModuleHandle (NULL);

  char *pGlobal = (char*)GetProcAddress (hMod, "d");

  printf("%s\n",pGlobal);

  return 0;
}

Posted 5-Mar-14 2:15am

CPallini

Comments

[no name] 5-Mar-14 9:00am

Neat.

CPallini 5-Mar-14 9:11am

Thank you.

gupta_abha 5-Mar-14 22:40pm

@CPallini: thank you . i want more question to you this programmming concept will be work where variable types is not known. if you have idea please tell me how??

wwwx 5-Sep-20 0:33am

If the code fail, in my case it's due to the DLL path I use is not latest, can check if the dll path is point to newest dll exactly.

wwwx 5-Sep-20 0:33am

If the code fail, in my case it's due to the DLL path I use is not latest, can check if the dll path is point to newest dll exactly.