在Win 7 64位上在Visual Studio 2012中编写x86汇编代码时遇到的问题

Question

I want to create an application that shows an array of character in console with x86 assembly language. i write it in Visual Studio 2012 Ultimate Version. In addition my Windows is 7 64 bit. When run it in compiler, I mean in visual studio, I've this error:

main.cpp(8):  error C2443: operand size conflict
main.cpp(11): error C2432: illegal reference to 16-bit data in 'second operand'

My code is:

void main(){
    char nameAndId[] = "name:mohammad mahdi derakhshani .\n";
    int sc=-1;
    while(nameAndId[sc++]!=0){
        _asm{
            push si
line 8:     mov si,sc

            xor edx,edx
line 10:    mov dl,nameAndId[si]
            mov ah,2
            int 21h
            pop si
        }
    }
}

How can i fix this problem?

Answer 1

You are using 16-bit SI register instead of 32-bit one ESI .

For the other side, I don't know if int 21 still works but I recommend to get a pointer to WriteConsoleA api using GetProcAddress and call the api instead of using the old dos functions.

Third: When the loop begins, sc equal -1, so you reference nameAndId[-1] . Change sc++ with ++sc .