ios - 计算下载完成百分比时出错

Question

我有以下代码用于计算下载文件的百分比和剩余时间。我有来自 chilkat FTP2 模块的以下数据:字节/秒和总文件大小和剩余文件大小。

怎么了？我仍然得到很高的负百分比数字和负数或非常小的时间 (0.00213)

int Calcbytesreceived = [ftp.AsyncBytesReceived intValue];

int Calcdownloadrate = [ftp.DownloadRate intValue];

// data from FTP chilkat module: fileSize (bytes) ,  ForCalcbytesreceived (bytes) , ForCalcdownloadrate ( bytes / sec ) all Int format

double PercentOfFile = ( (double)Calcbytesreceived / (double)fileSize) * 100 ; 

double SecondsRemaining = ((double)fileSize - (double)Calcbytesreceived) / (double)Calcdownloadrate ;

double MinutesRemaining = (double)SecondsRemaining / 60 ;

NSLog(@"percent loaded = %@", PercentOfFile); 

Answer 1

PercentOfFile 是 double 类型。您需要使用“%f”而不是“%@”来显示 double 值。将最后一行更改为:

NSLog(@"percent loaded = %f", PercentOfFile); 

编辑:这是一个很好的资源链接，用于确定何时使用不同的 NSLogs

http://www.cocoadev.com/index.pl?NSLog