Question

Following code produces the error:

error C2296: '*' : illegal, left operand has type '__int64 *'|

Error line (<——)

DWORD increasefactor = 1;

__int64 initialtime64 = 0;
__int64 initialoffset64 = 0;

...

BOOL WINAPI QueryPerformanceCounter_Detour(__int64 *lp)
{
    BOOL ret = QueryPerformanceCounter_Trampoline(lp);
    lp = ((lp-initialtime64)*increasefactor)+initialoffset64;   // <------
    return ret;
}

Where is my fault?

Thanks a lot in advance.

Answer 1

lp is a pointer to an __int64, not an actual __int64. The expression

lp = ((lp-initialtime64)*increasefactor)+initialoffset64;

attempts to assign an integer to a pointer to an integer, not to mention the fact that you are subtracting from that same pointer later in the same line.

You need to dereference the pointer with the * operator to get at the value pointed to by lp.

*lp = ((*lp-initialtime64)*increasefactor)+initialoffset64;

You should probably also read up on pointers in C++/C.