Can Detours hook functions defined by myself???

[hiber987]

Hi: I've been learning to use Detours recently, but I have a question: Can Detours hook functions defined by myself? For example, there is a function in the header file written by myself: void runcmd(const char *) If I get this header file, is it possible for me to hook this function using Detours? Thank U!

[hiber987]

And my files are here! runcmd.zip

[sylveon]

Yes

[hiber987]

Yes

Then the question is, why cannot my detour function modify the target function's execution? In my code "runcmd.zip“，although the runcmd function is successfully hooked, runcmd still executes its original process rather than following the modified process. I expect it to output: simple64.dll: Starting. simple64.dll: Detoured runCmd(). 6 + 6 = 12 Hello world Hello Detours! cmd: Hei, my brother from another mother! simple64.dll: Removed runCmd() (result=0).

However, it still outputs: simple64.dll: Starting. simple64.dll: Detoured runCmd(). Hello Detours! cmd: Hei, my brother from another mother! simple64.dll: Removed runCmd() (result=0).

Did I forget something? Could you look at the code for me? Thank U!

[sylveon]

The function is implemented in a header, so there are two versions of runCmd:

• One in the .DLL
• One in the .exe

The .DLL is only altering its own copy of the function. Furthermore, compiler inlining might also prevent all call sites from being affected.

[hiber987]

The function is implemented in a header, so there are two versions of runCmd:

• One in the .DLL
• One in the .exe

The .DLL is only altering its own copy of the function. Furthermore, compiler inlining might also prevent all call sites from being affected.

I changed the program. Put the implementation of runCmd in the CPP file, but this would cause the following error when generating runCmd64.dll: error LNK2001: unresolvable external symbol "void __cdecl runCmd(char const *)" (?runCmd@@..........)

My code was modified from simple.cpp in the Detours\ Sample \simple directory. But it doesn't work as well as simple.cpp. I really don't know how to fix it... Could you please change the runcmd.zip at your convenience? It's really too hard for a person who is new to Detours to understand. Thank U!

[bgianfo]

@hiber987 do you still need help here? Or can this be closed?

[bgianfo]

closing this after no response