蓝牙插座上的图片从Android传输到Windows

我找不到这个问题的解决方案：我在android上制作了一个程序来拍摄一张图片（jpg格式），并通过蓝牙通道将其发送到嵌入式Windows XP pc。我还为Windows制作了C++应用程序来接收图片
通信是使用蓝牙插座实现的。在安卓系统中，该应用程序以1024字节的块读取文件，并将每个块写入套接字，直到图片完成。在Windows端，我读取1024字节的chunck中的字节，直到recv（…）函数返回值>0。

结果是，在Android端，似乎所有的字节都被正确读取和发送，但在Windows端，我（几乎）总是只接收70-80%的字节。我甚至可以看到收到的正确字节，因为可以可视化jpg（图像底部缺少的字节显示为灰色）。我很少能收到整张照片。在这里，我发布了Android方面的相关代码部分：

String picturePath = "/sdcard/VERDE/PTR-0_15-31-24.jpg";
File picture = new File(picturePath);
if (picture.exists())
{
    Log.d(TAG, "File " + picture.getAbsolutePath() + " exists!");
    try
    {
        FileInputStream fis = new FileInputStream(picture);
        ostream = socket.getOutputStream();
        byte[] buf = new byte[1024];
        int read = 0;
        int totBytes = 0;
        while ((read = fis.read(buf)) != -1)
        {
            totBytes = totBytes + read;
            ostream.write(buf, 0, read);
            Log.d(TAG, "Image - Read: " + read + " - Total "
                                + totBytes + " bytes!");
        }
        ostream.flush();
        ostream.close();
        fis.close();
    } catch (UnknownHostException ex)
    {
        System.out.println(ex.getMessage());
    } catch (IOException ex)
    {
        System.out.println(ex.getMessage());
    }
} else
{
    Log.d(TAG, "File " + picture.getAbsolutePath()
            + " does not exist!");
}

这是C++应用程序代码的相关部分：

if (_outFile != NULL) 
{
    _outFile.open(result.c_str(), ofstream::binary); //"pic.jpg"
    cout << "File opened!" << endl;
} else 
{
    cout << "Can't open file!" << endl;
}
while ((received = recv(client, buf, sizeof(buf), 0)) > 0) 
{
    cout << "R:" << received << " ";
    if (received > 0) 
    {
        totalBytes += received;
        if (_outFile.is_open()) 
        {
            _outFile.write(buf, received); 
            cout << " (Total: " << totalBytes << " B)" << endl;
        } else
        cout << "Error in recv() function, received bytes = "
                        << received << endl;
    } else 
        cout << "R:" << received << " ";
}

我看过几十个关于这个话题的博客和帖子，但似乎没有人有类似的问题！如果你有任何想法，请帮帮我！

谢谢！