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AcroPdf Active X control with Reader 9.0

Jul 2, 2008 10:39 AM

Hi Guys,
We have been developing a Windows .NET based solution that displays PDF files. We have been using the AcroPDF.dll active X component which further launches the AcroRd32.exe.

1. Upon installation of Reader 9.0, we no longer see the AcroRd32.exe in the task manager.
2. When we exit the application, we see an error message "Cannot read the memory at ...."

1. Do we need a newer version of the Active X control? If yes, Where do we get this new version from?
2. How has Adobe addressed issues of memory management in Reader 9.0?
  • Currently Being Moderated
    Jul 2, 2008 3:40 PM   in reply to (mohit)
    When you install Adobe Reader, it installs the ActiveX along with it - nothing extra to install. I assume you uninstalled all other versions of Reader when you did so - yes?

    What "memory management issues" are you referring to?

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    Oct 13, 2008 12:02 AM   in reply to (mohit)
    Dear Rosenthol :

    I come from taiwan ^^

    I have the same problem in the forms

    Leonard Rosenthol, "C#, App.Exit() is not closing Acrobat process." #1, 10 Oct 2008 1:07 pm

    When we exit the application, we see an error message "Cannot read the memory at ...."


    My old program is 7.0, are normal before, but updated to 9.0, will appear on the attached map(i send mail to you) error.
    Are there any ways to solve it?
    Thank you very much~
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  • Currently Being Moderated
    Jan 30, 2009 4:10 AM   in reply to (mohit)
    Hi all,

    We are getting the same issue when switching from Adobe Reader version 8.0 to 9.0.

    We have a C# application which loads PDF documents on a WinForm using the AxAcroPDF component. When the form is loaded and unloaded multiple times and then the main application exited, the following is obtained:

    Application error:
    i The instruction at .... referenced memory at ....... The memory could not be "read"

    Has a fix/patch been released for this?

    The issue does not occur when uninstalling Adobe reader 9.0 and reinstalling Adobe reader 8.0.

    Many thanks,
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  • Currently Being Moderated
    Feb 27, 2009 12:16 AM   in reply to (mohit)
    Any news on this issue?

    Try running the BasicIacOCXCS example found in Acrobat 9 SDK.
    this will give you the error as mentioned above.
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  • Currently Being Moderated
    Feb 27, 2009 6:47 AM   in reply to (mohit)
    I believe that this problem has been corrected for a future update.
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  • Currently Being Moderated
    Mar 6, 2009 11:11 PM   in reply to (mohit)
    Hi all ,

    We are facing similar problem on press of tab.

    In Windows application we are using AcroPDF.dll to load Reader 9.0.
    When we run the application PDF is Loaded sucessfully , but later when we press tab application closes with an Error .

    "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

    Are there any ways to solve this?

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  • Currently Being Moderated
    Mar 11, 2009 7:46 AM   in reply to (mohit)
    I've just downloaded and tested the last release.
    Stil having the same problem.

    To reproduce the problem:
    - Download Acrobat 9 SDK
    - Run BasicIacOCXCS (compiled!!)
    - Open 2 PDF files
    - Close the application

    Memory Read or Write Exception !

    Can somebody tell me how too fix this ??
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  • Currently Being Moderated
    Apr 3, 2009 12:58 PM   in reply to (mohit)
    I fixed this problem guys

    Just put the AxAcroPDF object inside a panel on your windows form then add a OnClosing event for the form and with the following I don't get the errors any more

    private void Form1_FormClosing(object sender, FormClosingEventArgs e)

    without the sleep call I would sometimes get the error, I didn't fiddle with the sleep time though.

    Hope this helps!
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  • Currently Being Moderated
    Jun 5, 2009 2:11 PM   in reply to (Ian_McCloy)

    CodingMoose ,


    This only fixes it for people that are getting the error when closing the form, right?


    I am having the same problem as DarshanManjunath - we're both getting this error when hitting tab while the pdf viewer has focus on the form.


    Any idea how to avoid the error in this case?  Thanks!


    EDIT:  I guess that was the case for the original post on this thread, sorry!

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  • Currently Being Moderated
    Feb 26, 2010 1:07 AM   in reply to (mohit)
    I just found the solution at the following link:


    It uses the following code:

    static extern void CoFreeUnusedLibraries();

    private void Form2_FormClosing(object sender, FormClosingEventArgs e)
    if (axAcroPDF1 != null)

    I used it, and found no errors :-)


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  • Currently Being Moderated
    Mar 16, 2010 4:01 AM   in reply to Jigar Chhadwa

    This doesn't work for me. A working solution is over here: blem-c




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