calling APIs

[Sam Finch]

I'm trying to do a Simple Hello World app using C++ inline asm. something along these lines

#include <windows.h>

void main()
{

	char* msg = "Hello World";
	char* cap = "A Message";

	//	MessageBox(0,msg,cap,0);    //This is what the asm should do

	__asm
	{
		mov ebx, msg
		mov ecx, cap

		push 0
		push ecx
		push ebx
		push 0

		call MessageBoxA

	}


}

I've tried all sorts of variations on this, but none of them seem to work.

I am getting a message box, but rather than saying "Hello World" it says "Unhandled excaption in Tests.exe: 0xC0000005: Access violation." I've stepped through the code and it raises it on the call MessageBoxA line, what am I doing wrong that causes the computer to make such a strange spelling mistake?

For the past week, everyday, nonstop, ive been trying to look for that question. Ive e-mailed microsoft, ive posted in BBS's, ive even asked the a-hole experts on IRC, but to no avail. No one that ive ever talked knows the answer to this question. Im now posting here cuz if there is an answer, i need it to.