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Thread: rtcMsgBox breakpoint doesn't work

  1. #1
    id6262
    Guest

    rtcMsgBox breakpoint doesn't work

    Hi,
    I trying to crack VB5 application, but stuck with breakpoints.
    So i made simple VB5 application for investigation with one button which calls dialog. Steps I made:
    1. run simple program
    2. call (ctrl+d) SoftIce
    3. set breakpoint (bpx rtcMsgBox)
    4. close (ctrl+d) SoftIce
    5. press button which calls dialog
    According to bunch of cracking tutorials I have read on step 5 SoftIce must popup - but it doesn't!!!!

    I use SoftIce 4.05
    Also I have line "EXP=C:\WINNT\system32\msvbvm50.dll" in Winice.dat file.
    I attached Winace.dat file.

    Any clues, what I am doing wrong?
    Attached Files Attached Files
    I promise that I have read the FAQ and tried to use the Search to answer my question.

  2. #2
    <script>alert(0)</script> disavowed's Avatar
    Join Date
    Apr 2002
    Posts
    1,281
    rtcMsgBox is used for the vb function MessageBox, not for a general dialog box

  3. #3
    id6262
    Guest
    My VB5 button code:
    "Private Sub Command1_Click()
    MsgBox "Hello World!"
    End Sub"

    Then I open this program with W32Dasm, i see in import section:
    "Addr: xxxxxxxx hint(0253) Name: rtcMsgBox"

    If I delete code above and compile my program, W32Dasm doesn't show anything like 'rtcMsgBox' anymore.
    So I comming to conclusion that "MsgBox 'Hello World!'" is related to rtcMsgBox.

    Anyway, this only my thoughts...
    If "bpx rtcMsgBox" wrong break point, which breakpoint is valid for catching this "MsgBox"?
    I promise that I have read the FAQ and tried to use the Search to answer my question.

  4. #4
    <script>alert(0)</script> disavowed's Avatar
    Join Date
    Apr 2002
    Posts
    1,281
    nevermind, i misunderstood. i thought you were trying to break on rtcmsgbox when opening a normal dialog box.

    as for why the breakpoint isn't working, there are dozens of possibilities. search the board for advice

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