Thread: CreateFile() giving errors

  1. #1
    30 Helens Agree neandrake's Avatar
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    CreateFile() giving errors

    I'm using VS 6, Windows 2003.

    Code:
    hLayerFile = CreateFile("ltmp.dat", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    I get this error:
    Code:
    error C2440: '=' : cannot convert from 'void *' to 'struct HWND__ *'
    When I hover the mouse over the CreateFile() function, it gives a weird declaration of it.

    Code:
    void *__cdecl CreateFile(unsigned short *, unsigned long, unsigned long, _SECURITY_ATTRIBUTES *, unsigned long, unsigned long, void *);
    Did I miss something? What happened to CreateFile?

    More on my project, as I have a feeling it has something to do with the error. I'm writing a dll plugin for a program. Here's the top part of driver.cpp:

    Code:
    #define WIN32_LEAN_AND_MEAN
    #include <windows.h>
    Any ideas on what I should do? I created a new Win32 Dynamic-Link Library project and started coding. I'm having no other (known)errors other than the few CreateFile() calls. Thanks for help.
    Environment: OS X, GCC / G++
    Codes: Java, C#, C/C++
    AOL IM: neandrake, Email: neandrake (at) gmail (dot) com

  2. #2
    Yes, my avatar is stolen anonytmouse's Avatar
    Join Date
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    2,544
    Could it be that you have declared hLayerFile as:
    Code:
    HWND hLayerFile;
    rather than:
    Code:
    HANDLE hLayerFile;
    The CreateFile prototype looks correct for a unicode build, except for the cdecl calling convention. I assume this is just a "quirk" of the IDE?

  3. #3
    30 Helens Agree neandrake's Avatar
    Join Date
    Jan 2002
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    Yes, changed HWND to HANDLE and fixed it. I just jumped back into windows programming after a long break from it. Didn't catch that. Thanks.
    Environment: OS X, GCC / G++
    Codes: Java, C#, C/C++
    AOL IM: neandrake, Email: neandrake (at) gmail (dot) com

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