AutoIt NetSend

CoePSX · August 11, 2006

After a lot of trial and error, I came up with this function, to send network messages

without the need of an outside program like net.exe.

The messenger service must be enabled for this to work on windows. This functions is

based on API Dllcalls, like CreateFile and WriteFile.

The GUI is the simplest as possible, the real gold here is the function. Took a lot of time

to make it work.

Hope it's useful to someone. :whistle:

Here's the code:

#NoTrayIcon
#include <GUIConstants.au3>

GUICreate("NetSend", 200, 160, -1, -1)
GUICtrlCreateLabel("Receiver:", 10, 13, 50, 15)
$ReceiverComputer = GUICtrlCreateInput("", 60, 10, 130, 20)
GUICtrlCreateLabel("Message:", 10, 38, 50, 15)
$Message = GUICtrlCreateInput("", 60, 35, 130, 20)
GUICtrlCreateLabel("From:", 10, 68, 50, 15)
$Sender = GUICtrlCreateInput(@ComputerName, 60, 65, 130, 20)
GUICtrlCreateLabel("To:", 10, 93, 50, 15)
$ReceiverName = GUICtrlCreateInput("", 60, 90, 130, 20)
$OK = GUICtrlCreateButton("Send", 10, 120, 180, 30)
GUISetState()

While 1
    Switch GUIGetMsg()
        Case $GUI_EVENT_CLOSE
            Exit
        Case $OK
            $Send = NetSend(GUICtrlRead($ReceiverComputer), GUICtrlRead($Message), GUICtrlRead($Sender), GUICtrlRead($ReceiverName))
            If $Send = 0 Then
                MsgBox(16, "NetSend", "Error! The message could not be sent!")
            EndIf
    EndSwitch
WEnd


;===============================================================================
;
; Description:      NetSend
; Parameter(s):     $szReceiverComputer - Name of the target computer. * for all.
;                   $szMessage - The text to be sent. Can contain line breaks
;                                and tabs.
;                   $szSender - Optional. Name of the sender.
;                   $szReceiverName - Optional. Name of the target that appears
;                                     in the message.
; Requirement:      AutoIt Beta
; Return Value(s):  Returns 1 if message was successfully sent.
;                       Return 0 if message was not sent.
; Author(s):        CoePSX (coepsx at yahoo dot com dot br)
; Note(s):          None.
;
;===============================================================================
Func NetSend($szReceiverComputer, $szMessage, $szSender = "", $szReceiverName = "")
    Local Const $GENERIC_WRITE = 0x40000000
    Local Const $FILE_SHARE_READ = 0x00000001
    Local Const $OPEN_EXISTING = 0x00000003
    Local Const $FILE_ATTRIBUTE_NORMAL = 0x00000080
    Dim $szAscConvert[256]
    $szAscConvert[131] = 159
    $szAscConvert[160] = 255
    $szAscConvert[161] = 173
    $szAscConvert[162] = 189
    $szAscConvert[163] = 156
    $szAscConvert[164] = 207
    $szAscConvert[165] = 190
    $szAscConvert[166] = 254
    $szAscConvert[167] = 245
    $szAscConvert[168] = 249
    $szAscConvert[169] = 184
    $szAscConvert[170] = 166
    $szAscConvert[171] = 174
    $szAscConvert[172] = 170
    $szAscConvert[173] = 240
    $szAscConvert[174] = 169
    $szAscConvert[175] = 238
    $szAscConvert[176] = 248
    $szAscConvert[177] = 241
    $szAscConvert[178] = 253
    $szAscConvert[179] = 252
    $szAscConvert[180] = 239
    $szAscConvert[181] = 230
    $szAscConvert[182] = 244
    $szAscConvert[183] = 250
    $szAscConvert[184] = 247
    $szAscConvert[185] = 251
    $szAscConvert[186] = 167
    $szAscConvert[187] = 175
    $szAscConvert[188] = 172
    $szAscConvert[189] = 171
    $szAscConvert[190] = 243
    $szAscConvert[191] = 168
    $szAscConvert[192] = 183
    $szAscConvert[193] = 181
    $szAscConvert[194] = 182
    $szAscConvert[195] = 199
    $szAscConvert[196] = 142
    $szAscConvert[197] = 143
    $szAscConvert[198] = 146
    $szAscConvert[199] = 128
    $szAscConvert[200] = 212
    $szAscConvert[201] = 144
    $szAscConvert[202] = 210
    $szAscConvert[203] = 211
    $szAscConvert[204] = 222
    $szAscConvert[205] = 214
    $szAscConvert[206] = 215
    $szAscConvert[207] = 216
    $szAscConvert[208] = 209
    $szAscConvert[209] = 165
    $szAscConvert[210] = 227
    $szAscConvert[211] = 224
    $szAscConvert[212] = 226
    $szAscConvert[213] = 229
    $szAscConvert[214] = 153
    $szAscConvert[215] = 158
    $szAscConvert[216] = 157
    $szAscConvert[217] = 235
    $szAscConvert[218] = 233
    $szAscConvert[219] = 234
    $szAscConvert[220] = 154
    $szAscConvert[221] = 237
    $szAscConvert[222] = 232
    $szAscConvert[223] = 225
    $szAscConvert[224] = 133
    $szAscConvert[225] = 160
    $szAscConvert[226] = 131
    $szAscConvert[227] = 198
    $szAscConvert[228] = 132
    $szAscConvert[229] = 134
    $szAscConvert[230] = 145
    $szAscConvert[231] = 135
    $szAscConvert[232] = 138
    $szAscConvert[233] = 130
    $szAscConvert[234] = 136
    $szAscConvert[235] = 137
    $szAscConvert[236] = 141
    $szAscConvert[237] = 161
    $szAscConvert[238] = 140
    $szAscConvert[239] = 139
    $szAscConvert[240] = 208
    $szAscConvert[241] = 164
    $szAscConvert[242] = 149
    $szAscConvert[243] = 162
    $szAscConvert[244] = 147
    $szAscConvert[245] = 228
    $szAscConvert[246] = 148
    $szAscConvert[247] = 246
    $szAscConvert[248] = 155
    $szAscConvert[249] = 151
    $szAscConvert[250] = 163
    $szAscConvert[251] = 150
    $szAscConvert[252] = 129
    $szAscConvert[253] = 236
    $szAscConvert[254] = 231
    $szAscConvert[255] = 152

    Local $bRet = 0
    
    Local $pszMailSlot = DllStructCreate("char[" & StringLen("\\" & $szReceiverComputer & "\MAILSLOT\messngr") + 1 & "]")
    DllStructSetData($pszMailSlot, 1, "\\" & $szReceiverComputer & "\MAILSLOT\messngr")
    
    Local $szFinalMessage = $szSender & Chr(0) & $szReceiverName & Chr(0) & $szMessage & Chr(0)
    Local $pucMessage = DllStructCreate("byte[" & StringLen($szFinalMessage) & "]")
    For $i = 1 To StringLen($szFinalMessage)
        Local $szTemp = Asc(StringMid($szFinalMessage, $i, 1))
        If $szAscConvert[$szTemp] <> "" Then
            DllStructSetData($pucMessage, 1, $szAscConvert[$szTemp], $i)
        Else
            DllStructSetData($pucMessage, 1, $szTemp, $i)
        EndIf
    Next
    
    Local $hHandle = DllCall("kernel32.dll", "hwnd", "CreateFile", "ptr", DllStructGetPtr($pszMailSlot), _
                                "int", $GENERIC_WRITE, _
                                "int", $FILE_SHARE_READ, _
                                "ptr", 0, _
                                "int", $OPEN_EXISTING, _
                                "int", $FILE_ATTRIBUTE_NORMAL, _
                                "int", 0)
    $hHandle = $hHandle[0]
    
    If $hHandle Then
        Local $bRet = DllCall("kernel32.dll", "int", "WriteFile", "hwnd", $hHandle, _
                                "ptr", DllStructGetPtr($pucMessage), _
                                "int", DllStructGetSize($pucMessage), _
                                "long_ptr", 0, _
                                "ptr", 0)
        $bRet = $bRet[4]
        
        DllCall("kernel32.dll", "int", "CloseHandle", "hwnd", $hHandle)
    EndIf
    
    Return $bRet
EndFunc  ;==> NetSend

And the attached script:

NetSend.au3

Edited August 13, 2006 by CoePSX

nitekram · August 11, 2006

What does it use as I have tried DNS and IP.

CoePSX · August 11, 2006

It uses computer name, like John, Server1 or PC1 etc

NetSend(@ComputerName, "Server1", "Hi!")

Is the same as typing "net send Server1 Hi!"

(Doesn't have to be @ComputerName, you can put Frodo

if you want, it'll still work.

nitekram · August 11, 2006

It uses computer name, like John, Server1 or PC1 etc
NetSend(@ComputerName, "Server1", "Hi!")
Is the same as typing "net send Server1 Hi!"
(Doesn't have to be @ComputerName, you can put Frodo
if you want, it'll still work.

I will have to test it later - when I am at work, I tried at home and I can get the message on my pc but not another pc - not on the same workgroup - but I would not think that matters. But it looks cool - is there any other service it can run on or port as services are more than not turned off on most pc's to keep out unwanted

Daniel W. · August 11, 2006

well done :whistle:

CoePSX · August 11, 2006

I solved the ascii problem.

I made a script to send all the characters from 128 to 255, read

from the messenger window and write the code for me.

I got a conversion table to make the message be received properly.

It's in the first post

arcker · August 13, 2006

You're amazing guy !!!!!

i have tried so much to do a thing like this

my net send script is about to be posted (because my firm, and our client support uses it now)

but, i will try to integrate your tool, because of the security issues, it could be really interesting to not allow users to use net send.exe

rbhkamal · August 13, 2006

Very nice, :whistle:

When I first read the title I thought you where using TCP functions to send the message.

RK

Edited August 13, 2006 by rbhkamal

Rick · August 13, 2006

what a great script, its funny, just this week a friend who was working as a call centre asked me for a program to do just this , it saved me a job Thanks.

CoePSX · August 13, 2006

:whistle: Another little change on the script.

I realized that you could send a message to a computer name, for example: PC2,

and use another name to appear as the recipient. Like:

NetSend ("PC2", "Hi balt guy!", "Neo", "Morpheus")

Message from Neo to Morpheus:

Hi balt guy!

The code is updated in the first post. The GUI example is updated too.

Valuater · August 13, 2006

Nice Job!

here's one i wrote a little while back

Dim $un = @UserName
Dim $QT_web = "www.ClickTask.com"
$ver = "1.0"

;delete last listing
Filedelete(@TempDir & "\a.tmp")
Filedelete(@TempDir & "\b.tmp")

; make sure net send is running
RunWait("net start messenger","",@SW_HIDE)

;gets the computer list and a few other things
RunWait(@ComSpec & ' /c net view > ' & @TempDir & '\a.tmp',"", @SW_HIDE)
Sleep(300)
;open the file for working
$file = FileOpen(@TempDir & "\a.tmp", 0)

; Check if file opened for reading OK
If $file = -1 Then
    MsgBox(0, "QT - Error", "Unable to open file.")
    Exit
EndIf

;Creates new file in which the result will be written
FileOpen(@TempDir & "\b.tmp", 1)

; Read in lines of text until the EOF is reached in file a.tmp
While 1
    $line = FileReadLine($file)
    If @error = -1 Then ExitLoop
  ;find the string "\\"
    $result = StringInStr($line,"\\")
      if $result = 1 Then
    ;find next blank
      $blankpos = StringInStr($line," ")
    ;Find length of line
      $len = StringLen($line)
    ;calculate from what position to Trim string to the right
      $len = $len - $blankpos
    ;Trim all characters after the computer name
      $line = StringTrimRight($line, $len)
    ;Trim the //
      $line = StringTrimLeft($line,2)
    ;Write line to file, adding "|"
      FileWrite(@TempDir & "\b.tmp", $line & "|")
      EndIf

Wend

FileClose($file)
FileDelete(@TempDir & "\a.tmp")
$file2 = FileReadline(@TempDir & "\b.tmp", 1)

;install pics
    $Time_Logo = @TempDir & "\Time-logo.jpg"
    FileInstall("C:\XPClean-web\Settings\XPClean-pics\Time.jpg", $Time_Logo)
    $Time_icon = @TempDir & "\Time-Icon.ico"
    FileInstall("C:\XPClean-web\Settings\XPClean-pics\Time-Icon.ico", $Time_icon)
    $Sound_clk = @TempDir & "\Sound_clk.wav"
    FileInstall("C:\XPClean-web\Settings\XPClean-pics\Sounds\Clickerx.wav", $Sound_clk)
    $Sound_grp = @TempDir & "\Sound_grp.wav"
    FileInstall("C:\XPClean-web\Settings\XPClean-pics\Sounds\Group_open.wav", $Sound_grp)
    $Sound_bar = @TempDir & "\Sound_bar.wav"
    FileInstall("C:\XPClean-web\Settings\XPClean-pics\Sounds\xpinfbar.wav", $Sound_bar)
    $Sound_lnk = @TempDir & "\Sound_lnk.wav"
    FileInstall("C:\XPClean-web\Settings\XPClean-pics\Sounds\Notify.wav", $Sound_lnk)


;GUI Start
#include "GUIConstants.au3"
;#include <Process.au3>

;Set GUI
Opt("GUICoordMode", 1)
;Opt("GUINotifyMode", 1)
$Dummy_win = GUICreate('')
$Tmesg_win = GuiCreate("*QTime Station*  -  PC Messenger                                ver " & $ver, 482, 335, -1, -1,-1,$WS_EX_ACCEPTFILES,$Dummy_win);, $WS_OVERLAPPEDWINDOW + $WS_VISIBLE + $WS_CLIPSIBLINGS)
GUISetFont(9, 400, -1, "MS Sans Serif")
GUISetIcon($Time_icon)
$Icon_1 = GUICtrlCreatePic($Time_Logo, 393, 10, 75, 70)
GUICtrlSetCursor(-1, 0)
GUICtrlSetTip(-1, "ClickTask.com")

$Group_1A = GuiCtrlCreateGroup( "Message from: ", 20, 10, 350, 50)
GUICtrlCreateLabel( $un, 40, 30, 150, 20)



;Create 1 combo box, give focus and populate with contents of b.tmp
$Group_1A = GuiCtrlCreateGroup("Message to: ",20, 70, 350, 50)
$combo_1 = GUICtrlCreateCombo("", 130, 87, 120, 20)
GUICtrlSetState(-1,$GUI_FOCUS)
GUICtrlSetData(-1,$file2)
$label_1 = GUICtrlCreateLabel( "C&hoose the PC", 40, 90, 80, 20)


$Group_4 = GuiCtrlCreateGroup("Last Message Sent", 20, 270, 350, 50)
$MSent = GUICtrlCreateLabel("No Recent Messages", 40, 288, 320, 28)

;Create buttons
$button_1 = GUICtrlCreateButton("S&end", 390, 190, 80, 30)
               GUICtrlSetState(-1,$GUI_DEFBUTTON)
$button_2 = GUICtrlCreateButton("Set-Up", 390, 275, 80, 20)
$button_3 = GUICtrlCreateButton("C&ancel",  390, 300, 80, 20)




;create text input
$Group_3 = GuiCtrlCreateGroup("Message Text", 20, 140, 350, 120)
GUICtrlCreateLabel("Please Type in Your Test Message in the Box Below", 40, 165, 310, 20)
GUICtrlCreateLabel("The Message includes the Time, Date, PC and Sender Name", 40, 185, 320, 20)
$text = GUICtrlCreateInput("Message", 40, 215, 310, 20)

;Show the GUI
GuiSetState (@SW_SHOW)
SoundPlay ($Sound_lnk,1)

;sets tray icon
    opt("TrayMenuMode", 1)  ; Default tray menu items (Script Paused/Exit) will not be shown.
    opt("TrayOnEventMode", 1)
;TraySetClick (16); right click
    
    $show_tray = TrayCreateItem ("Show  *QTime Station*")
    TrayItemSetOnEvent (-1, "Set_Show")
    TrayCreateItem ("")
    $upgrade_tray = TrayCreateItem ("Check New Releases")
    TrayItemSetOnEvent (-1, "Set_Update")
    TrayCreateItem ("")
    $setup_tray = TrayCreateItem ("Net-Send Setup")
    TrayItemSetOnEvent (-1, "Set_Setup")
    TrayCreateItem ("")
    $about_tray = TrayCreateItem ("About ClickTask.com")
    TrayItemSetOnEvent (-1, "Set_QT")
    TrayCreateItem ("")
    $exit_tray = TrayCreateItem ("Exit  *QTime Station*")
    TrayItemSetOnEvent (-1, "Set_Exit")
    
    TraySetState ()

$msg = 0
While 1; $msg <> -3
$msg = GuiGetMsg()
Select
case $msg = $button_3 Or $msg = $GUI_EVENT_CLOSE
    GUISetState(@SW_HIDE, $Tmesg_win)
    SoundPlay ($Sound_grp,1)
case $msg = $button_2
;SoundPlay ($Sound_clk,1)
    Call("Set_Setup")
case $msg = $button_1
    SoundPlay ($Sound_clk,1)
    $CPUID = GuictrlRead($combo_1)
    If $CPUID = "" Then
        MsgBox(64,"Send Error 1"," Please choose a PC to  *Send*  to...      ")
        ContinueLoop
    EndIf
    $msg1 = GuictrlRead($text)
    If $msg1 = "" Or $msg1 = "Message" Then
        MsgBox(64,"Send Error 2"," Please Type a  *Text Message*  First...      " )
        ContinueLoop
    EndIf
    $runvar =RunWait(@comspec & " /c net send " & $CPUID & $un & " says:   " & $msg1,"",@sw_hide)
;MsgBox(0,"",$runvar)
    If $runvar > 0 Then
        MsgBox(64,"Send Error 3"," Your Message   *Could Not Be Sent*       " & @CRLF & @CRLF & " Please press the  *Set-Up*  Button    "  & @CRLF & @CRLF & "and press  *Set-Up*  on " & $CPUID & "  " )
        ContinueLoop
    EndIf
    GUICtrlSetData ( $MSent, $msg1)
    EndSelect
WEnd

Exit

;---------------------------- FUNCTIONS ----------------------

Func Set_Update()
    SoundPlay ($Sound_clk,1)
    Run(@ProgramFilesDir & "\Internet Explorer\iexplore.exe " & $QT_web)
    WinWaitActive("")
EndFunc

Func Set_Show()
    SoundPlay ($Sound_grp,1)
    GUISetState(@SW_SHOW, $Tmesg_win)
EndFunc  

Func Set_QT()
    SoundPlay ($Sound_grp,1)
    $iMsgBoxAnswer = MsgBox(32, "*QTime Station* ,  by   QTasc (Now ClickTask.com)", "WHO IS,  QT APPRAISAL SERVICE CO ?" & @CRLF & "" & @CRLF & "We are a Real Estate Appraisal Company based in Riverside, California. " & @CRLF & "" & @CRLF & "Thank you." & @CRLF & "" & @CRLF & "", 60)
    Select
        Case $iMsgBoxAnswer = -1;Timeout
        EndSelect
    SoundPlay ($Sound_grp,1)
EndFunc

Func Set_Exit()
    SoundPlay ($Sound_lnk,1)
    Exit
EndFunc  ;==>Set_Exit

Func Set_Setup()
    SoundPlay ($Sound_clk,1)
    GUISetState(@SW_HIDE, $Tmesg_win)
    Run("mmc Services.msc -k netsvcs", @SystemDir)
    WinWaitActive("Services")
    Sleep(300)
    Send("{TAB}")
    Sleep(300)
    Send("Messenger")
    Sleep(300)
    Send("{ENTER}")
    Sleep(300)
    Send("!e")
    Sleep(300)
    Send("A")
    Sleep(300)
    Send("!A")
    Sleep(300)
    Send("!S")
    Sleep(2000)
    MsgBox(64,"Finished Set-up"," If all settings are satisfactory...    " & @CRLF & " Please press  *OK*   ")
    While 3
        If Not WinExists("Messenger Properties") Then ExitLoop
        Sleep(100)
    WEnd
    Sleep(100)
    WinClose("Services")
    
EndFunc  ;==>Set_Exit

maybe you could use the computer listing feature

8)

arcker · August 16, 2006

arghhhhh !

your function works well with the computername, but no with the username

so i can't integrate it in my program

maybe you could integrate a debug to find where is the problem

CoePSX · August 16, 2006

Actually, you can't send messages to users with the Windows Messenger service. The messenger service works by writing data to a file in the target computer.

To be able to send the message, you must know the name of the computer.

I don't have much knowledge at this, but could be possible to retrieve the computer name by providing the username. The experient coders here may be able to answer that.

arcker · August 17, 2006

mmmm sure, but if it is possible by net send, i'm sure it should be by your dll

i've understood how it works, and yes, we have to find a correspondance between the username and the computername to write the good thing into the the target computer...really hard, I remember it's based on the SMB protocol if i'm right, but i don't know more xD

but for now, your program is really cool (and really fast)

Zedna · May 16, 2012

Just for info:

Now I tested it on Windows7 64bit and it crashed (stopped responding and was killed).

BrewManNH · May 16, 2012

I'm guessing that might be because the Messenger service is no longer supported in Vista/7 any longer, and most had it turned off in XP.

JScript · May 16, 2012

Very nice!!

Here is my version:

I do not use the Messenger service...

Regards,

João Carlos.

Edited May 16, 2012 by JScript

UEZ · May 16, 2012

The kernel32 DLL calls are buggy.

This is not crashing

...
    Local $szFinalMessage = $szSender & Chr(0) & $szReceiverName & Chr(0) & $szMessage & Chr(0)
    Local $pucMessage = DllStructCreate("byte[" & StringLen($szFinalMessage) & "]")
    For $i = 1 To StringLen($szFinalMessage)
        Local $szTemp = Asc(StringMid($szFinalMessage, $i, 1))
        If $szAscConvert[$szTemp] <> "" Then
            DllStructSetData($pucMessage, 1, $szAscConvert[$szTemp], $i)
        Else
            DllStructSetData($pucMessage, 1, $szTemp, $i)
        EndIf
    Next

    Local $hHandle = DllCall("kernel32.dll", "hwnd", "CreateFile", _
                                "ptr", DllStructGetPtr($pszMailSlot), _
                                "dword", $GENERIC_WRITE, _
                                "dword", $FILE_SHARE_READ, _
                                "ptr", 0, _
                                "dword", $OPEN_EXISTING, _
                                "dword", $FILE_ATTRIBUTE_NORMAL, _
                                "int", 0)
    $hHandle = $hHandle[0]

    If $hHandle Then
        _WinAPI_WriteFile($hHandle, DllStructGetPtr($pucMessage), DllStructGetSize($pucMessage), $nBytes)
        _WinAPI_CloseHandle($hHandle)
    EndIf

    Return $nBytes
...

but I don't know whether it is working properly.

Br,

UEZ

Edited May 16, 2012 by UEZ

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