iphone - 在 iPhone 编程中，如何从具有 XP 操作系统的服务器接收带有 TCP/IP 的图像文件？

Question

我正在用 iPhone 制作图像接收器。

服务器以字节发送图像文件。

并且，我尝试将这些字节制作成图像。

但是，我无法制作图像。已经，几天过去了……

我真的需要你的帮助...

这是我使用的源代码。

        Byte recvBuffer[500];

        memset(recvBuffer, '\0', sizeof(recvBuffer));
        [iStream read:recvBuffer maxLength:sizeof(recvBuffer)-1];

        NSUInteger len = sizeof(recvBuffer);
        NSData *webdata = [NSData dataWithBytes:recvBuffer length:len];
        imageview.image = [UIImage imageWithData:webdata];

如果你给我评论，我会很感激!感谢阅读!

Answer 1

badgerr 的答案基本上是我会使用的答案，但由于问题被标记为 Objective-C 代码实际上应该在 Objective-C 中 - 如下所示。请注意，通过 TCP/IP 连接，-read:maxLength: 可能会在读取请求的字节数之前返回。

uint32_t size;  // Let's make sure size is an explicit width.

NSInteger totalBytesRead = 0;
NSInteger bytesRead = [istream read: &size maxLength: sizeof size];
while (bytesRead > 0 && totalBytesRead + bytesRead < sizeof size)
{
    totalBytes+= bytesRead;
    bytesRead = [istream read: &size + totalBytesRead maxLength: (sizeof size) - totalBytesRead];
}
if (bytesRead >= 0)
{
    totalBytesRead += bytesRead;
}
else
{
    // read failure, report error and bail
}
if (totalBytesRead < sizeof size)
{
    // connection closed before we got the whole size, report and bail
}
size = ntohl(size);  // assume wire protocol uses network byte ordering

NSMutableData* buffer = [[NSMutableData alloc] initWithLength: size];
totalBytesRead = 0;
bytesRead = [istream read: [buffer mutableBytes] maxLength: size];
while (bytesRead > 0 && totalBytesRead + bytesRead < size)
{
    totalBytes+= bytesRead;
    bytesRead = [istream read: (char*)[buffer mutableBytes] + totalBytesRead maxLength: size - totalBytesRead];
}
if (bytesRead >= 0)
{
    totalBytesRead += bytesRead;
}
else
{
    // read failure, report error and bail (not forgetting to release buffer)
}
if (totalBytesRead < size)
{
    // connection closed before we got the whole image, report and bail (not forgetting to release buffer)
}
else
{
    [buffer setLength: size];
}

imageView.image = [UIImage imageWithData: buffer];
[buffer release];

我直接将上面的内容输入到 SO 中，所以它没有经过测试甚至没有编译。