Ok i have a small assembly question Post: 302636823

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Top Forums Programming Ok i have a small assembly question Post 302636823 by Errigour on Tuesday 8th of May 2012 03:51:11 AM

05-08-2012

Registered User

Ok i have a small assembly question

I have this small program that runs with the flat assembler. My problem is that at the receive line function it receives the line and if there isn't a $ typed at the end of the user input the program displays a lot of strange stuff, sometimes beeps and then it seems to terminate without causing any damage to m computer. My question is how do I receive a string of characters with assembly maybe with that function without requiring that the user type $ at the end of his/her input.

Code:

ORG 100h ; Start at 100h memory DOS 16 bit .com files
;USE16    ; Use 16 bit mode.
        ; Print line function $ is new line
        ; ah says print line dx is the line to print

        mov ah, 00001001b
        mov dx, msg
        ; Jump to Display It
        jmp DisplayHelloWorld!

DisplayHelloWorld!:
        int 21h

        ; Receive line function
        mov ah, 3fh
        mov dx, Receive
        mov cx, 30
        mov bx, 0
        int 21h

        ; Compare 10d with the value of ah
        cmp dx, Receive
        ; Jump if equal
        je PrintName
        ; Jump if not equal
        jne UnderstandAssembly

UnderstandAssembly:
        ; Call to 21h, again prints line Name
        mov ah, 09h
        mov dx, und
        int 21h

PrintName:
        ; Call to 21h, again prints line Name
        mov ah, 09h
        mov dx, Receive
        int 21h

        ; Tell program to stay alive
        mov ah, 01h
        int 21h
        ; Exit program
        mov ah, 4ch
        int 21h

msg db 'Enter Name: ', '$' ; 0Ah is new line feed, '$' is end of line
und db 'Dx changed before cmp dx, Receive' , '$'
Receive db 30d

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LEARN ABOUT OSX

avconvert

AVCONVERT(1)						    BSD General Commands Manual 					      AVCONVERT(1)

NAME

     avconvert -- movie conversion tool

SYNOPSIS

     avconvert [-hvq] --p <preset_name> --s <source_media> --o <output_movie>

DESCRIPTION

     avconvert can be used to compress video media to different types for sharing on the web or loading onto devices.

     -h       prints usage information and available presets

     -v       sets the console output to verbose

     -q       sets the console output to quiet

     -prog    shows progress during the export (default with -v)

     -p | --preset name
	      converts the source media to an output file using the specified preset. Use --listPresets to get the full list. Common presets are:

	      PresetAppleM4VCellular
	      PresetAppleM4ViPod
	      PresetAppleM4VWiFi
	      PresetAppleM4VAppleTV
	      PresetAppleM4V480pSD
	      PresetAppleM4V720pHD
	      PresetAppleM4V1080pHD
	      PresetAppleM4A

     -s | --source file
	      is the source media file

     -o | --output file
	      is the output movie file

     --listPresets
	      lists all of the presets avconvert supports

     --listTracks
	      lists the available tracks in the source media. Must be used with the --source flag

OPTIONS

     Optional flags to configure the audio export settings

     -adr number    a limit value for the data rate for the audio track in bits per second

     -af fourCC     sets the format of the audio output using a fourCC eg. aac

     -sr number     configures the sample rate of the output in Hertz. eg. 44100

     -cc number     is the channel count of the output eg. 1 (for mono) 2 (stereo) 4 (quad)

     Optional flags to configure the video export settings

     -vdr number    a limit value for the video data rate in bits per second

     -th number     sets the height of the output video in pixels

     -tw number     sets the width of the output video in pixels

     -vc fourCC     sets the format of the video output using a fourCC eg. avc1

     -fr number     sets the frame rate of the output video in frames per second

     -kr number     specifies how often keyframes appear in the output video

     -fr yes | no   sets whether or not to enable frame reordering (b-frames)

     Optional flags configuring track and metadata output

     -ot name	    omits the listed track type from the exported movie Allowable track types are:

		    videoTrack
		    audioTrack
		    subtitleTrack
		    chapterTrack
		    thumbnailTrack
		    closedcaptionTrack
		    textTrack

     -md file	    sets the file from which the metadata for the export is found if that is different from the source movie

EXAMPLES

	  avconvert --listPresets

     Lists the available presets that can be used for export

	  avconvert --preset AppleM4ViPod --source sample_movie.mov --output ipod_movie.m4v

     Exports the source movie "sample_movie.mov" to "ipod_movie.m4v" using the iPod encoding preset

	  avconvert --preset AppleM4VAppleTV --source sample_movie.mov --output appletv_movie.m4v -adr 128000 -sr 441000

     Overrides the AppleTV defaults for audio data rate and sample rate in the output movie

	  avconvert --preset AppleM4VAppleTV --source sample_movie.mov --output appletv_movie.m4v -ot audioTrack

     Omits the audio track from the output file "appletv_movie.m4v"

HISTORY

     avconvert command first appeared in Mac OS X 10.7.

Mac OS X							 December 14, 2011							  Mac OS X