FreeLibrary Quesion

This is a discussion on FreeLibrary Quesion within the Windows Programming forums, part of the Platform Specific Boards category; If I use the FreeLibrary function [FreeLibrary("dll_name.dll");] to free up the dll I'm using, the program executes the notice 3x ...

  1. #1
    I am the worst best coder Quantrizi's Avatar
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    FreeLibrary Quesion

    If I use the FreeLibrary function [FreeLibrary("dll_name.dll");] to free up the dll I'm using, the program executes the notice 3x (2x saying it successfully freed it up, and the last saying it didn't...so code below for details) the game crashes.

    I'm using Microsoft Visual C++ 6.0 w/ the Win32 API on a WinXP Home Edition system.

    If you want the source for the way I'm doing it, here it is:
    Code:
    #ifndef __GLOBALS_H
    #define __GLOBALS_H
    
    #include "log.h" // Logging works fine
    
    HINSTANCE tok = LoadLibrary("tokenizer.dll");	// Loads the tokenizer.dll
    
    // File-handling globals
    char szCode[1024];	// Arrary to hold the source code
    
    // Error handling
    char *szError;
    
    // Check to see if the library is free, if so, or if not, notify the user...even if something is wrong
    bool CheckFree()
    {
        if(tok) 
        {
    		bool Lib2Free = FreeLibrary(tok);
    
    		if(Lib2Free == false)
    		{
    			szError = "Unable to free tokenizer.dll!";
    			MessageBox(NULL, szError, NULL, NULL);
    			szDataToLog(szError);
    		}
    		else if(Lib2Free == true)
    		{
    			szError = "Successfully freed tokenizer.dll data!";
    			MessageBox(NULL, szError, NULL, NULL);
    			szDataToLog(szError);
    		}
    		else
    		{
    			szError = "Undefined exception, unable to determin tokenizer state!";
    			MessageBox(NULL, szError, NULL, NULL);
    			szDataToLog(szError);
    		}
    		return true;
        }
    
        else 
    	{
    		szError = "Unable to unload tokenizer.dll!";
    		MessageBox(NULL, szError, NULL, NULL);
    		szDataToLog(szError);
    	}
        return false;
    }
    
    #endif
    [I took out the stuff that isn't of any importance to my question.]

  2. #2
    Registered User
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    Are you sending in the right handle?
    I think you could use GetModuleHandle() to do this.?

    Try to get extended errorinformation from GetLastError()
    Code:
    /************************************\
     * GetErr()                         *
     *	Fetches error information       *
     * Input:                           *
     *	src*	->sourcemodule for error  *
     * Output:                          *
     *	void                            *
     * Author: Knut Øverli              *
    \************************************/
    void GetErr(char *src){
    	char errBuf[400];
    	sprintf(errBuf, "Return from GetLastError(%lu), src:\"%s\":\n", GetLastError(), src);
    	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), errBuf+strlen(errBuf), 399-strlen(errBuf), NULL);
    	b(0, errBuf, "System error", MB_ICONSTOP);
    }

  3. #3
    I am the worst best coder Quantrizi's Avatar
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    Originally posted by knutso
    Are you sending in the right handle?
    I think you could use GetModuleHandle() to do this.?
    I re-programmed my project, and I don't have that error anymore. I'm not sure what was wrong, but I'm not gonna worry about it anymore. Thanks though.

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