MessageBox Masm Body

gistfile1.asm

; #########################################################################

    .code

start:
    invoke GetModuleHandle, NULL ; provides the instance handle
    mov hInstance, eax

    invoke GetCommandLine        ; provides the command line address
    mov szCommandLine, eax

    ; actually invoke the windows entry point for the application
    invoke WinMain,hInstance,NULL,szCommandLine,SW_SHOWDEFAULT
    
    invoke ExitProcess,eax       ; cleanup & return to operating system

; #########################################################################

; The application's entry point (according to windows)
WinMain proc hInst     :DWORD,
             hPrevInst :DWORD,
             CmdLine   :DWORD,
             CmdShow   :DWORD

	; declare some variables to use
	szText szDialogTitle, "First example"
	szText szMessageText, "This is masm32 at work!"

	; show the message box
	invoke MessageBox, 0, ADDR szDialogTitle, ADDR szMessageText, MB_OK

	; exit this function with success (eax == 0)
	xor eax, eax
	ret

WinMain endp

end start