IOS-关于第三方解压库ZipArchive解压后中文乱码问题

-(BOOL) UnzipFileTo:(NSString*) path overWrite:(BOOL) overwrite{BOOL success = YES;    int index = 0;    int progress = -1;int ret = unzGoToFirstFile( _unzFile );unsigned charbuffer[4096] = {0};if( ret!=UNZ_OK ){[self OutputErrorMessage:@"Failed"];}    const char* password = [_password cStringUsingEncoding:NSASCIIStringEncoding];do{        @autoreleasepool {            if( [_password length]==0 )                ret = unzOpenCurrentFile( _unzFile );            else                ret = unzOpenCurrentFilePassword( _unzFile, password );            if( ret!=UNZ_OK )            {                [self OutputErrorMessage:@"Error occurs"];                success = NO;                break;            }            // reading data and write to file            int read ;            unz_file_infofileInfo ={0};            ret = unzGetCurrentFileInfo(_unzFile, &fileInfo, NULL, 0, NULL, 0, NULL, 0);            if( ret!=UNZ_OK )            {                [self OutputErrorMessage:@"Error occurs while getting file info"];                success = NO;                unzCloseCurrentFile( _unzFile );                break;            }            char* filename = (char*) malloc( fileInfo.size_filename +1 );            unzGetCurrentFileInfo(_unzFile, &fileInfo, filename, fileInfo.size_filename + 1, NULL, 0, NULL, 0);            filename[fileInfo.size_filename] = '\0';                        // check if it contains directory//            NSString * strPath = [NSString stringWithCString:filename encoding:self.stringEncoding]; 把这句话注释掉换成以下两句            NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);            NSString * strPath = [NSString  stringWithCString:filename encoding:enc];            BOOL isDirectory = NO;            if( filename[fileInfo.size_filename-1]=='/' || filename[fileInfo.size_filename-1]=='\\')                isDirectory = YES;            free( filename );            if( [strPath rangeOfCharacterFromSet:[NSCharacterSet characterSetWithCharactersInString:@"/\\"]].location!=NSNotFound )            {// contains a path                strPath = [strPath stringByReplacingOccurrencesOfString:@"\\" withString:@"/"];            }            NSString* fullPath = [path stringByAppendingPathComponent:strPath];                        if( isDirectory )                [_fileManager createDirectoryAtPath:fullPath withIntermediateDirectories:YES attributes:nil error:nil];            else                [_fileManager createDirectoryAtPath:[fullPath stringByDeletingLastPathComponent] withIntermediateDirectories:YES attributes:nil error:nil];                        FILE* fp = NULL;            do            {                read = unzReadCurrentFile(_unzFile, buffer, 4096);                if (read >= 0)                {                    if (fp == NULL) {                        if( [_fileManager fileExistsAtPath:fullPath] && !isDirectory && !overwrite )                        {                            if( ![self OverWrite:fullPath] )                            {                                // don't process any more of the file, but continue                                break;                            }                        }                        if (!isDirectory) {                            fp = fopen( (const char*)[fullPath UTF8String], "wb");                            if (fp == NULL) {                                [self OutputErrorMessage:@"Failed to open output file for writing"];                                break;                            }                        }                    }                    fwrite(buffer, read, 1, fp );                }                else // if (read < 0)                {                    ret = read; // result will be an error code                    success = NO;                    [self OutputErrorMessage:@"Failed to read zip file"];                }            } while (read > 0);                        if (fp)            {                fclose( fp );                                // add the full path of this file to the output array                [(NSMutableArray*)_unzippedFiles addObject:fullPath];                                // set the orignal datetime property                if( fileInfo.tmu_date.tm_year!=0 )                {                    NSDateComponents* components = [[NSDateComponents alloc] init];                    components.second = fileInfo.tmu_date.tm_sec;                    components.minute = fileInfo.tmu_date.tm_min;                    components.hour = fileInfo.tmu_date.tm_hour;                    components.day = fileInfo.tmu_date.tm_mday;                    components.month = fileInfo.tmu_date.tm_mon;                    components.year = fileInfo.tmu_date.tm_year;                                        NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];                    NSDate* orgDate = [[gregorianCalendar dateFromComponents:components] retain];                    [components release];                    [gregorianCalendar release];                                        NSDictionary* attr = [NSDictionary dictionaryWithObject:orgDate forKey:NSFileModificationDate]; //[_fileManager fileAttributesAtPath:fullPath traverseLink:YES];                    if( attr )                    {                        //[attr  setValue:orgDate forKey:NSFileCreationDate];                        if( ![_fileManager setAttributes:attr ofItemAtPath:fullPath error:nil] )                        {                            // cann't set attributes                             NSLog(@"Failed to set attributes");                        }                                            }                    [orgDate release];                    orgDate = nil;                }                            }                        if (ret == UNZ_OK) {                ret = unzCloseCurrentFile( _unzFile );                if (ret != UNZ_OK) {                    [self OutputErrorMessage:@"file was unzipped but failed crc check"];                    success = NO;                }            }                        if (ret == UNZ_OK) {                ret = unzGoToNextFile( _unzFile );            }                        if (_progressBlock && _numFiles) {                index++;                int p = index*100/_numFiles;                progress = p;                _progressBlock(progress, index, _numFiles);            }        }} while (ret==UNZ_OK && ret!=UNZ_END_OF_LIST_OF_FILE);return success;}