的GameKit蓝牙传输问题 [英] GameKit Bluetooth Transfer Problem
问题描述
我想使用的GameKit框架,通过蓝牙发送文件。我有但问题是,我只能在同一时间发送一个NSData对象,但我需要将其保存在另一端。这显然是不可能不知道文件名,但我不知道如何传送的。我试着将它转换为字符串的NSData *数据= [NSData的dataWithContentsOfFile:urlAddress];
但我只能发送一个NSData对象,而不是两个。
I am trying to send a file via Bluetooth using the GameKit framework. The problem I am having though is that I can only send one NSData object at a time, but I need to save it on the other end. this obviously isn't possible without knowing the filename, but i don't know how to transmit that. I've tried to convert it to a string NSData*data = [NSData dataWithContentsOfFile:urlAddress];
but i can only send one NSData object, not two.
有没有人碰到这个问题了吗?
Has anyone come across this problem yet?
推荐答案
与的GameKit工作了一段时间,我发现,有大约每90K发送所以,如果你是文件中的限制更大然后90K你必须打破它。这里是我会建议你打破东西:
Working with the GameKit for a while I've found that there is a limit of about 90k per 'send' so if you're file is larger then 90k you'll have to break it up. Here is how I would suggest you break things up:
1 - 发送的文件的名称
1st - Send the name of your file
NSData* fileNameData = [fileNameStr dataUsingEncoding: NSASCIIStringEncoding];
// send 'fileNameData'
2日 - 发送块的数目您要发送
2nd - Send the number of chunks your going to send
NSUInteger fiftyK = 51200;
NSUInteger chunkCount = (((NSUInteger)(srcData.length / fiftyK)) + ((srcData.length % fiftyK) == 0 ) ? 0 : 1))
NSString chunkCountStr = [NSString stringWithFormat:@"%d",chunkCount];
NSData* chunkCountData = [chunkCountStr dataUsingEncoding: NSASCIIStringEncoding];
// send 'chunkCountData'
3日 - 分手并发送NSData对象为一组每个小于50K NSObjects的(只是为了安全大小)
3rd - Break up and send your NSData object into a set of NSObjects of less then 50k each (just to be on the safe size)
NSData *dataToSend;
NSRange range = {0, 0};
for(NSUInteger i=0;i<srcData.length;i+=fiftyK){
range = {i,fiftyK};
dataToSend = [srcData subdataWithRange:range];
//send 'dataToSend'
}
NSUInteger remainder = (srcData.length % fiftyK);
if (remainder != 0){
range = {srcData.length - remainder,remainder};
dataToSend = [srcData subdataWithRange:range];
//send 'dataToSend'
}
在接收端你要做到以下几点:
On the receiving side you'll want to do the following:
1 - 接收的文件名
1st - Receive the file name
// Receive data
NSString* fileNameStr = [[NSString alloc] initWithData:receivedData encoding:NSASCIIStringEncoding]
2日 - 接收块的数量,您即将接受
2nd - Receive the number of chunks you are about to receive
// Receive data
NSString* chunkCountStr = [[NSString alloc] initWithData:receivedData encoding:NSASCIIStringEncoding]
NSUInteger chunkCount = [chunkCount intValue];
3 - 接收的数据块
3rd - Receive the chunks of data
NSMutableData data = [[NSMutableData alloc]init];
for (NSUInteger i=0; i<chunkCount;i++){
// Receive data
[data appendData:receivedData];
}
如果一切都已经工作的权利,你现在拥有一个包含文件名和数据的
包含对象您的文件的内容。 fileNameStr
对象
If everything has worked right you will now have a fileNameStr
object containing your file name and a data
object containing the contents of your file.
希望这有助于 - AYAL
Hope this helps - AYAL
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