NSURLConnection 和 ProgressBar 尝试转换为浮动时崩溃
我试图在使用 NSUrlConnection 下载时使用进度条，
但我缺少一些东西，但不知道
代码
我的 .hi 中的
NSMutableData *receivedData;
NSNumber *FileSize;
进度条的百分比
有什么，我用它来计算.m 中
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[receivedData setLength:0];
FileSize = [NSNumber numberWithLongLong:[response expectedContentLength]];
}
，
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[receivedData appendData:data];
NSNumber *resourceLength = [NSNumber numberWithUnsignedInteger:[receivedData length]];
NSLog(@"resourceData length: %d ", [resourceLength intValue]);
NSNumber *progress = [NSNumber numberWithFloat:([resourceLength floatValue] / [FileSize floatValue])];
updateProgressBar.progress = [progress floatValue];
}
当它到达 FileSize float 的行时，它会崩溃
2010 -10-05 22:32:19.924 古兰经[2067:207]资源数据长度：1090 程序收到信号：“EXC_BAD_ACCESS”。
i am trying to use progressbar while downloading using NSUrlConnection
am missing somthing but dont know what
see my code
in my .h i have
NSMutableData *receivedData;
NSNumber *FileSize;
which i use to calculate a precent for progressbar
in my .m
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[receivedData setLength:0];
FileSize = [NSNumber numberWithLongLong:[response expectedContentLength]];
}
and
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[receivedData appendData:data];
NSNumber *resourceLength = [NSNumber numberWithUnsignedInteger:[receivedData length]];
NSLog(@"resourceData length: %d ", [resourceLength intValue]);
NSNumber *progress = [NSNumber numberWithFloat:([resourceLength floatValue] / [FileSize floatValue])];
updateProgressBar.progress = [progress floatValue];
}
When its reach the line with FileSize float its crash
2010-10-05 22:32:19.924 Quran[2067:207] resourceData length: 1090
Program received signal: “EXC_BAD_ACCESS”.
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我相信
FileSize = [NSNumber numberWithLongLong:[response ExpectedContentLength]];为您提供了一个自动释放的 NSNumber，您需要将其保留在某处。也许您正在代码中的其他地方执行此操作，但这很可能是您获得 EXC_BAD_ACCESS 的地方。I believe that
FileSize = [NSNumber numberWithLongLong:[response expectedContentLength]];is giving you an autoreleased NSNumber that you need to retain somewhere. Maybe you are doing that somewhere else in the code, but that is a probable place you could be getting an EXC_BAD_ACCESS.