When calling GetComputerNameA, the program crash without errors

Question

I am trying to call GetComputerNameA from AutoIt, this is my code:

Local $mystruct = DllStructCreate(toStr("struct;dword;char[1024];endstruct"))
DllStructSetData($mystruct, 1, 1024)
Local $result = DllCall("kernel32.dll", "int", "GetComputerNameA", "ptr", DllStructGetPtr($mystruct, 2), "ptr", DllStructGetPtr($mystruct, 1))
MsgBox(0, "AutoIt", "Success")  

But after I run it, it doesn't print anything, like the script crashed without errors.
Any idea why it failed to call it?

Answer 1

It has two parameters, specifically:

BOOL GetComputerNameA(
  LPSTR   lpBuffer,
  LPDWORD nSize
);

The first is a LPSTR (pointer to a char array), the second is a LPDWORD (pointer to an unsigned int).

Here is how you'd call that:

Func _get_computer_name()
    Local $dll_struct = DllStructCreate("char[17]")
    
    $sz = DllStructCreate('int')
    Local $x = DllCall("kernel32.dll","int","GetComputerNameA","ptr",DllStructGetPtr($dll_struct),"int_ptr",DllStructGetPtr($sz))

    Return DllStructGetData($dll_Struct,1)
EndFunc