CFile::Open within an ActiveX ?
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Thread: CFile::Open within an ActiveX ?

  1. #1
    Join Date
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    CFile::Open within an ActiveX ?

    I have the following code within an ActiveX control and it crashes the TestContainer every time.


    CFile f;
    CFileException e;
    TCHAR* pFileName = _T("c:\\tree.txt");

    f.Open(pFileName, CFile::modeRead | CFile::shareDenyWrite, &e);




    The "tree.txt" file is in the "c:\" directory.
    Is there another way I should be doing file reading from within an ActiveX control?

    Any help would be greatly appreciated.

    Thanks. Pete


  2. #2
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    Re: CFile::Open within an ActiveX ?

    I forgot to mention the error I get is:
    3e6 : "Invalid access to memory location"


  3. #3
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    Re: CFile::Open within an ActiveX ?

    use ifstream C++ class, or fread().

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  4. #4
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    Re: CFile::Open within an ActiveX ?

    Quote Originally Posted by pdcira View Post
    I have the following code within an ActiveX control and it crashes the TestContainer every time.


    CFile f;
    CFileException e;
    TCHAR* pFileName = _T("c:\\tree.txt");

    f.Open(pFileName, CFile::modeRead | CFile::shareDenyWrite, &e);




    The "tree.txt" file is in the "c:\" directory.
    Is there another way I should be doing file reading from within an ActiveX control?

    Any help would be greatly appreciated.

    Thanks. Pete
    Shouldn't this line...
    TCHAR* pFileName = _T("c:\\tree.txt");

    only have one backslash?

    TCHAR* pFileName = _T("c:\tree.txt");

    Perhaps that would work better?

  5. #5
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
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    Re: CFile::Open within an ActiveX ?

    Quote Originally Posted by HarveyURAD View Post
    Shouldn't this line...
    TCHAR* pFileName = _T("c:\\tree.txt");

    only have one backslash?

    TCHAR* pFileName = _T("c:\tree.txt");

    Perhaps that would work better?
    No! \ is the escape char in strings so to actually have a \ in a string you use \\. See http://msdn.microsoft.com/en-us/library/6aw8xdf2.aspx
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement.

    C++17 Compiler: Microsoft VS2017 (15.4.4)

  6. #6
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    Jun 2014
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    Re: CFile::Open within an ActiveX ?

    Quote Originally Posted by 2kaud View Post
    No! \ is the escape char in strings so to actually have a \ in a string you use \\. See http://msdn.microsoft.com/en-us/library/6aw8xdf2.aspx
    Ah! You are absolutely correct, my mistake

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