malloc and free in a class

[pradeepkrao]

Hi,

I am trying to make few class similar to VB.

I thought that I will start with making String Class.

cString::~cString()
{
        free(strStr);
}
void cString::operator =(char *strNew)
{
        if (strStr != NULL)	
        {
            free(strStr);
            strStr = (char *)malloc(sizeof(char)* strlen(strNew));
        }
        else
        {
            strStr = (char *)malloc(sizeof(char)* strlen(strNew));
        }
            strcpy((char *)strStr,strNew);
}

cString &cString::operator+=(cString strNew)
{
            char * strTmp;
            strTmp = (char *) malloc(sizeof(char) * this->Len());
            
            strcpy(strTmp,(char *)strStr);

            strStr = (char *)malloc(sizeof(char)*strNew.Len());
            
            strcpy((char *)strStr,strTmp);
            strcat((char *)strStr,strNew.Value());
            free(strTmp);
            return *this;
}

class cString
{
private:
	void *strStr;
	
public:
	cString()
	{
		strStr = NULL;
	}
	
	~cString();
	
	long Len()
	{
		return strlen((char *)strStr);
	}
	
	char *Value()
	{
		return (char *)strStr;
	};

	cString &operator+=(cString strNew);
	
	void operator =(char *strNew);

	
};

I am unable to free the maemory allocated by malloc.
I am able to realloc but not free.. How am I supposed to do it..

Thanks,
Pradeep