How to import a DLL

This is a discussion on How to import a DLL within the C++ Programming forums, part of the General Programming Boards category; I have no experience with dynamic link libraries. The examples my book provide use the “#using” keyword. i.e #using <mscorlib.dll> ...

  1. #1
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    Question How to import a DLL

    I have no experience with dynamic link libraries. The examples my book provide use the “#using” keyword.

    i.e #using <mscorlib.dll>

    I have a .dll used for encrypting the username and password when loging into Yahoo Messenger. I copied the .dll to my project folder and used this code to link it.

    Code:
    #ifndef __login_h__
    #define __login_h__
    #using <YMSG12ENCRYPT.DLL>
    #endif
    Error:
    Code:
    fatal error C1113: #using failed on 'c:\yahoologinc\ymsg12encrypt.dll

    This also don't work
    Code:
    HMODULE hMod = LoadLibrary("YMSG12ENCRYPT.DLL");
    Error:
    Code:
    error C2664: 'LoadLibraryW' : cannot convert parameter 1 from 'const char [18]' to 'LPCWSTR'
    I think the .dll was written in vb.

    What am I missing on this?
    Last edited by chad101; 05-30-2007 at 07:41 PM.

  2. #2
    Registered User Queatrix's Avatar
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    This is a Unicode problem. Call LoadLibraryA() rather than LoadLibrary().

  3. #3
    carry on JaWiB's Avatar
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    > This is a Unicode problem. Call LoadLibraryA() rather than LoadLibrary().

    Or better yet, use a TEXT or _T macro to transform it to a unicode string literal:
    Code:
    HMODULE hMod = LoadLibrary(TEXT("YMSG12ENCRYPT.DLL"));
    I don't know what your first problem is, though. I think that the #using macro is something from MS Managed C++ or C++/CLI, but I'm not sure.
    "Think not but that I know these things; or think
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    Yea it is, “VC++.NET How to Program” is an intermediate book on managed C++. Very good book though. I never knew VC++ had a built in garbage collector (__gc) till I bought this book.

    The main problem was importing this DLL into my chat client. I found a yahoo login example online and I don’t have the code for the DLL just the login example (Written in VB.NET).

    I’m practicing network programming as my summer break project and a simple yahoo chat client would be a fun way to do this.
    Last edited by chad101; 05-31-2007 at 06:30 PM.

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