No one can help me how to use function 0x51F900 and what is arguments pass to that function ? :( Please help me

If possible,please help me decompile that asm code to real code in C++ .Please see my example to understand what I say .Thanks u

SO,I want to know how many arguments in that function,and How to use that function

for example:

void MyFunc(int s) {
struct itemRec {
int code;
int index;
} bItem;
bItem.code =...

For Example .I have a function that code in C++ :

void MyFunc(int s) {
struct itemRec {
int code;
int index;
} bItem;
bItem.code = 0x0000000B;
bItem.index = s;
__asm {