【dll 返回字符串 】2

【vc <--> vc】返回void* 类型

void* __stdcall torrent_hash( const char *TorrentFilePath)
{
    char szText[41]={0};
    if(strcmp(TorrentFilePath,"") == 0 || TorrentFilePath == NULL)
        return NULL;

    string strHashString = "abcdefg";    

    sprintf(szText,"%s",strHashString.c_str() );
    
    printf("dll output: [%s %s] Anylist Result : %s \t Hash: %s\n",__DATE__,__TIME__, TorrentFilePath , strHashString.c_str() );
    
    return (void*)szText;
}

 extern "C" __declspec(dllexport) void* __stdcall  torrent_hash ( const char *TorrentFilePath);

使用：

 

void torrent_hash( char *backhash, const char *TorrentFilePath )
{

    typedef void* (__stdcall *TORRENT_HASH)(const char *TorrentFilePath_indll);    

    TORRENT_HASH HashFun;

    HINSTANCE HDLL = LoadLibrary(HASH_DLL_PATH);     
    
    if(HDLL==NULL) 
    {
        printf("cannot find the dll file");
        return ;
    }
    
         
     HashFun = (TORRENT_HASH)GetProcAddress(HDLL,"torrent_hash"); 

    
    strcpy(backhash , (char*)HashFun( TorrentFilePath));

    printf("TorrentFilePath Hash:%s \t %s\n",TorrentFilePath, backhash);
        
    

    FreeLibrary(HDLL);

    return ;

}

int main(int argc, char **argv)
{
    
        if(argc>=0)
        {
            char backhash[41]={0};
            
            torrent_hash( backhash ,argv[1]);
                        
            printf("TorrentFilePath Hash:%s \t %s\n",argv[1], backhash);

        }
        else
        {
            printf("loaddll torrent_path\n");
        }
     
        printf("end\n");