Question

我有以下代码来计算下载文件的剩余百分比和剩余时间。我有来自chilkat FTP2模块的以下数据：字节/秒和剩余的文件总大小和文件大小。

有什么问题？我仍然得到高负数百分比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的类型为double。你需要使用＆＃34;％f＆＃34;而不是＆＃34;％@＆＃34;显示双精度值。将您的最后一行更改为：

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

编辑：这是指向何时使用不同NSLog的良好资源的链接

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

计算下载完成百分比时出错

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