ASM Community

: error LNK2001: unresolved external symbol __imp__mciSendStringA@16
:fatal error LNK1120: 1 unresolved externals

#include <windows.h>
#include <commctrl.h>
#include <Mmsystem.h>

#define ID_BUT 1

char cname[]="dfds";

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
HWND hwnd;
HINSTANCE hInst;

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrev,LPSTR CmdLine,int nCmd)
{
	WNDCLASSEX wc={0};
	MSG msg;

	wc.hInstance = hInstance;
	wc.lpfnWndProc = WndProc;
	wc.lpszClassName = cname;
	wc.hIcon = LoadIcon(0,IDI_APPLICATION);
	wc.hIconSm = LoadIcon(0,IDI_APPLICATION);
	wc.hCursor = LoadCursor(0,IDC_ARROW);
	wc.cbSize = sizeof(WNDCLASSEX);
	wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE+1);

	if(!RegisterClassEx(&wc))
		return 1;

	hwnd = CreateWindowEx(0,cname,"",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,200,200,0,0,hInst,0);

	ShowWindow(hwnd,nCmd);

	while(GetMessage(&msg,0,0,0)>0)
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return (int) msg.wParam;
}
HWND butt;

LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wparam,LPARAM lparam)
{
	switch(message)
	{
	case WM_CREATE:
		butt = CreateWindowEx(0,WC_BUTTON,"Open",BS_PUSHBUTTON|WS_CHILD|WS_VISIBLE,10,10,100,25,hwnd,(HMENU)ID_BUT,0,0);

		break;
	case WM_COMMAND:
		switch(wparam)
		{
		case ID_BUT:
			mciSendString("Set CDAudio Door Open", NULL, 0, NULL);
			break;
		}

		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hwnd,message,wparam,lparam);
	}
	return 0;
}

; open_cd.asm
;
include \masm32\include\masm32rt.inc
include \masm32\include\winmm.inc
includelib \masm32\lib\winmm.lib

.CODE

    Drive_h     db "open h: type cdaudio alias cd", 0
    Open_CD     db "set cd door open", 0
    Close_CD    db "set cd door closed", 0

start:

    invoke  mciSendString, OFFSET Drive_h, 0, 0, 0
    invoke  mciSendString, OFFSET Open_CD, 0, 0, 0
    
    invoke  mciSendString, OFFSET Close_CD, 0, 0, 0
    
    invoke ExitProcess,0

end start