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我正在尝试使用 NSOuptutStream 的写入方法将大型图像从服务器发送到客户端。但是我发现在写入 684032 字节后，流不再写入字节。我觉得这特别奇怪。我能够发送尺寸 < 680432 的图像并在客户端正确接收它们。下面附上代码片段。如果有人能指出我到底哪里出错了，那就太好了。

UIImage *img;
img = [UIImage imageWithContentsOfFile:path];
NSMutableData *imgData = [UIImageJPEGRepresentation(img, 1.0) mutableCopy];

const void *bytes = [imgData mutableBytes];
NSInteger length = [imgData length];
self.bufferLimit = length;
NSLog(@"self.bufferoffset %d self.bufferlimit %d", self.bufferOffset, self.bufferLimit);

uint8_t *crypto_data = (uint8_t *)bytes;                   
NSInteger   bytesWritten;

if([self.outputStream hasSpaceAvailable]) {
    NSLog(@"Space Available");
} else NSLog(@"Space Not Available");

while (self.bufferOffset < self.bufferLimit) {

    bytesWritten = [self.outputStream write:(uint8_t *)crypto_data maxLength:1024];
    NSLog(@"server: bytes weritten %d",bytesWritten);
    assert(bytesWritten != 0);
    if (bytesWritten == -1) {
        [self stopSendWithStatus:@"output buffer write error"];
    } else {
        self.bufferOffset += bytesWritten;
    }
    NSLog(@"self.bufferoffset %d self.bufferlimit %d", self.bufferOffset, self.bufferLimit);
} 
NSLog(@"Done sending");
[self.outputStream close];

当我的代码挂起时，这是我留下的输出

...
2012-07-04 13:53:20.903 BasicClientServer[1707:f803] self.bufferoffset 681984 self.bufferlimit 1334301
2012-07-04 13:53:20.903 BasicClientServer[1707:f803] 服务器：写入字节数 1024
2012- 07-04 13:53:20.904 BasicClientServer[1707:f803] self.bufferoffset 683008 self.bufferlimit 1334301
2012-07-04 13:53:20.905 BasicClientServer[1707:f803] 服务器：写入的字节数 1024
2012-07-04 13： 53:20.906 BasicClientServer[1707:f803] self.bufferoffset 684032 self.bufferlimit 1334301

并且不会超出这一点

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