获取 FTP 下载的文件大小
我正在使用“SimpleFTPSample”项目进行测试apple 了解 ftp 在 iOS 上的工作原理。我在“GetController.m”中添加了两行来获取要下载的文件的大小。
-(void)_startReceive
{
.
.
.
// Open a CFFTPStream for the URL.
ftpStream = CFReadStreamCreateWithFTPURL(NULL, (CFURLRef) url);
CFReadStreamSetProperty(ftpStream, kCFStreamPropertyFTPFetchResourceInfo, kCFBooleanTrue); // Added: To get file size
.
.
.
}
- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode
{
.
.
.
switch (eventCode) {
case NSStreamEventOpenCompleted: {
// Added: Finally get filesize
fileSize = [[self.networkStream propertyForKey:(id)kCFStreamPropertyFTPResourceSize] integerValue];
[self _updateStatus:@"Opened connection"];
} break;
.
.
.
}
现在我得到了正确的文件大小（fileSize），但之后下载将无法开始。 “NSStreamEventHasBytesAvailable”情况将不会被处理。我怎样才能让它发挥作用？失败在哪里？我想显示下载状态的进度条 - 所以我之前需要完整的文件大小。
我希望你能帮我解决这个问题。 谢谢！
im testing around with the "SimpleFTPSample" project from apple to understand how ftp with iOS works. i have added two lines in the "GetController.m" to get the size of the file to download.
-(void)_startReceive
{
.
.
.
// Open a CFFTPStream for the URL.
ftpStream = CFReadStreamCreateWithFTPURL(NULL, (CFURLRef) url);
CFReadStreamSetProperty(ftpStream, kCFStreamPropertyFTPFetchResourceInfo, kCFBooleanTrue); // Added: To get file size
.
.
.
}
- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode
{
.
.
.
switch (eventCode) {
case NSStreamEventOpenCompleted: {
// Added: Finally get filesize
fileSize = [[self.networkStream propertyForKey:(id)kCFStreamPropertyFTPResourceSize] integerValue];
[self _updateStatus:@"Opened connection"];
} break;
.
.
.
}
now i get the correct file size (fileSize) but after that the download won't start. the "NSStreamEventHasBytesAvailable" case won't be handled. how can i get this to work? where's the failure? i want to show a progress bar for the download state- so i need the complete filesize before.
i hope you can help me out with this.
thanks!
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我非常确定，当您设置 kCFStreamPropertyFTPFetchResourceInfo 时，这意味着您只对该特定请求中的资源大小感兴趣。
您可能应该创建一个新的控制器，它是 GetController 的子类，将其命名为 StatController... 将 _startReceive 和流处理程序重写为您的新方法。
在开始异步下载之前，使用 StatController 获取资源大小。
I am pretty sure that when you set kCFStreamPropertyFTPFetchResourceInfo, that means your are only interested in the resources size in that particular request.
you should probably make a new controller that is a subclass of GetController, call it StatController... override _startReceive and the stream handler to your new methods.
use the StatController to get the resource size before you start the async download.
要获取文件大小，您只需要：
顺便问一下，您知道如何获取 ftp 服务器中文件的修改日期吗？
To get the file size you just need:
By the way do you know how to get the modification date of the file in the ftp server??