c++ - Vsscanf replacement for VS not working -


hey need used vsscanf due way legacy code did format comparing, microsoft decided didn't need include vsscanf stuck trying find implementation it. found http://www.flipcode.net/archives/vsscanf_for_win32.shtml 1 of first links , totally readable , understandable me, reason cant work.

not going include implementation of vsscanf because in link. copied , pasted , included file. simple code wanted run test , make sure got values access , copy on other places getting exception.

first code testing with:

int matches = 0; void** arglist = new void*[3]; matches = vsscanf("hello123test321", "hello%itest%i", (va_list)arglist);

exception unhandled exception @ (location) in (project): 0xc0000005: access violation. occures when gets sscanf part of in lining. 

(snippit source found @ link above) void *savedesp; _asm {     mov     savedesp, esp;     mov     esp, newstack;     call    sscanf;            //this exception thrown     mov     esp, savedesp;     mov     result, eax; }

i feel whatever doing silly need point out me. need make comparison, make sure there correct amount, , have structure values passed in back.

thanks

you allocate array of 3 pointers:

void** arglist = new void*[3];

but pointers not point anything. sscanf stored integers reads in memory pointers point to, random memory.

before calling vsscanf, need like:

void** arglist = new void*[2]; int* values = new int[2]; arglist[0]=(void *)values; arglist[1]=(void *)values+1;

but think function never work. creates new stack parameters. 

mov     esp, newstack; call    sscanf;

but sscanf function use stack, call other functions or store registers on stack. allow stack must larger. or better, should use normal stack instead of creating 1 itself.


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