我从苹果的官方网站下载了名为WiTap 的代码,这是用于在本地Wi-Fi网络上传输数据的。我正在一个客户端 - 服务器架构的项目中工作。我正在将NSData从客户端发送到服务器端。
我制作了两个项目:一个是客户端,一个是服务器端。
在客户端项目中,我进行了以下更改,修改了AppController.m文件并添加了以下方法:
AppController.m(客户端)
- (void)sendData:(NSData*)pobjData
{
assert(self.streamOpenCount == 2);
if ( [self.outputStream hasSpaceAvailable] )
{
NSInteger bytesWritten;
NSUInteger length = [pobjData length];
bytesWritten = [self.outputStream write:[pobjData bytes] maxLength:[pobjData length]];
NSLog(@"written bytes -> %d",bytesWritten);
}
}
通过调用这个方法,我发送了数据。
在服务器端项目中,我通过修改以下方法修改了AppController.m文件,进行了如下更改:
AppController.m(服务器端)
- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode
{
#pragma unused(stream)
switch(eventCode) {
case NSStreamEventOpenCompleted: {
self.streamOpenCount += 1;
assert(self.streamOpenCount <= 2);
// Once both streams are open we hide the picker and the game is on.
if (self.streamOpenCount == 2) {
[self dismissPicker];
[self.server deregister];
}
} break;
case NSStreamEventHasSpaceAvailable: {
assert(stream == self.outputStream);
// do nothing
} break;
case NSStreamEventHasBytesAvailable:
{
if (stream == self.inputStream)
{
NSInteger bytesRead;
uint32_t buffer[32768];
NSMutableData *_data = [NSMutableData data];
// Pull some data off the network.
bytesRead = [self.inputStream read:buffer maxLength:sizeof(buffer)];
if (bytesRead == -1) {
} else if (bytesRead == 0) {
} else {
// FIXME: Popup an alert
const long long expectedContentLength = bytesRead;
NSUInteger expectedSize = 0;
// expectedContentLength can be represented as NSUInteger, so cast it:
expectedSize = (NSUInteger)expectedContentLength;
[_data appendBytes:buffer length:expectedSize];
NSLog(@"\"Data received has length: %d", _data.length);
[self performSelector:@selector(getData:) withObject:_data afterDelay:1.0];
}
}
}
break;
default:
assert(NO);
// fall through
case NSStreamEventErrorOccurred:
// fall through
case NSStreamEventEndEncountered: {
[self setupForNewGame];
} break;
}
}
并添加了一个写入接收数据到文件的方法
#define kUserDirectoryPath NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)
-(void)getData:(NSMutableData *)pData
{
NSFileManager *tmpmanager = [NSFileManager defaultManager];
[tmpmanager createFileAtPath:[AppController getDocumentDirectoryPath:[NSString stringWithFormat:@"%@.png",[NSDate date]]] contents:pData attributes:nil];
}
+(NSString*)getDocumentDirectoryPath:(NSString*)pStrPathName
{
NSString *strPath=nil;
if(pStrPathName)
strPath = [[kUserDirectoryPath objectAtIndex:0] stringByAppendingPathComponent:pStrPathName];
return strPath;
}
我将.png文件转换为NSData并从客户端发送到服务器端。服务器将文件下载到文件目录。
问题在于,当我从客户端传输文件时,它会下载到服务器端的文档目录中。对于小文件,一切正常。但是如果文件大小超过8kB,则写入文档目录的文件会损坏。
请帮助我能够发送大文件。