Question

I am trying to invoke a simple procedure in assembly, but I cannot get it to work properly.

I do have the prototype defined in the data segment as

    mySearch PROTO,
map: PTR BYTE,
char: BYTE

Then I have the procedure right before the END main (in main.asm)

   mySearch PROC, string: PTR BYTE, char: BYTE
     ret
    mySearch ENDP

I am invoking the procedure as:

mov ebx, LENGTHOF msg1
INVOKE mySearch , ADDR myString, ebx

IF I lose the second parameter

char: BYTE

My program compiles. So, my problem is, i dont understand how to pass a character to my procedure.

Answer 1

There should not be any ‘,’ after PROTO or PROC.
So it should look like:

mySearch PROTO map: PTR BYTE, char: BYTE



mySearch PROC string: PTR BYTE, char: BYTE
 ret
mySearch ENDP