[C] Winapi Call Dynamically and easily

[dosprog]

It's likely not a good idea.
Any of imported functions must be correctly declared individulally,
and thus must be called normally.
In addition - without of using __asm directive.
In addition2 - repeated calls will be performed much faster.
In addition3 - [less or more] universal solution for x32/x64.

..It's likely not a good idea but it works..

--Add--

Add 1st argument of function as enum {C_CALL,STD_CALL}
and produce separate __asm code for this conventions ?



--Add2--

Originally Posted by 0xall0c

Example :

DWORD dwResult = DynCall("ntdll.dll","NtUnmapViewOfSection",
					PI.hProcess,
					(LPVOID)(NtHeader->OptionalHeader.ImageBase),0xb33f
				);

Dont forget to add one extra paramater at end i.e 0xb33f

This example rewritten without of DynCall():

DWORD(__stdcall*_NtUnmapViewOfSection)(DWORD,DWORD);

void main(void)
{
DWORD result;

if(!(_NtUnmapViewOfSection=(DWORD(__stdcall*)(DWORD,DWORD))GetProcAddress(LoadLibrary("ntdll.dll"),"NtUnmapViewOfSection")))goto dos_exit;

result=_NtUnmapViewOfSection(0,0);

dos_exit:;
}

[0xall0c]

Originally Posted by dosprog

It's likely not a good idea.
Any of imported functions must be correctly declared individulally,
and thus must be called normally.
In addition - without of using __asm directive.
In addition2 - repeated calls will be performed much faster.
In addition3 - [less or more] universal solution for x32/x64.

..It's likely not a good idea but it works..

--Add--

Add 1st argument of function as enum {C_CALL,STD_CALL}
and produce separate __asm code for this conventions ?



--Add2--


This example rewritten without of DynCall():

see the function prototype you defined, when there are lot functions to call, that's an extra headache.

[Pansemuckl]

Originally Posted by 0xall0c

see the function prototype you defined, when there are lot functions to call, that's an extra headache.

Not if you're using variadic templates (C++ 11)...
It produces even simpler, smaller and clean code.

[0xall0c]

Originally Posted by Pansemuckl

Not if you're using variadic templates (C++ 11)...
It produces even simpler, smaller and clean code.

i didn't used variadic templates before. thank you for pointing out.

[dosprog]

Originally Posted by 0xall0c

see the function prototype you defined, when there are lot functions to call, that's an extra headache.

It's programming..

In MASM32 we can invoke function using prototype or call function without prototype.
I tend to use the invoke.
It is convenient, however it is necessary to get used to.