WriteFile有时会返回错误代码6

Question

以下是代码片段：

CreateFile代码：

m_RunFileHandle = CreateFile(strRunFullPath,
                             EFileAccess.GenericWrite,
                             EFileShare.None,
                             IntPtr.Zero, 
                             ECreationDisposition.CreateAlways,
                             EFileAttributes.Write_Through | EFileAttributes.NoBuffering,
                             IntPtr.Zero);

WriteFile代码：

WriteFile(m_RunFileHandle, NewFramePixelData, nDataSize, out nBytesWritten, IntPtr.Zero);

查询:很少有WritrFile方法返回错误代码6。

Answer 1

如果在FILE_FLAG_OVERLAPPED模式下使用文件，则需要指向重叠结构的指针，否则请确保在未关闭句柄的情况下不会多次调用CreateFile。

在调用WriteFile之前，检查CreateFile是否被多次调用(没有关闭之前创建的句柄)。在这种情况下，系统会返回错误6。

Answer 2

溶剂为：

[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool WriteFile(
    IntPtr hFile,
    byte[] lpBuffer,
    UInt32 nNumberOfBytesToWrite,
    ref UInt32 lpNumberOfBytesWritten,
    ref DriverEntity.OVERLAPPED lpOverlapped);

修改为：

[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool WriteFile(
    IntPtr hFile,
    byte[] lpBuffer,
    UInt32 nNumberOfBytesToWrite,
    ref UInt32 lpNumberOfBytesWritten,
    IntPtr lpOverlapped);

使用：

DriverDAL.WriteFile(
    hDevice,
    writeBuffer,
    (uint)writeBuffer.Length,
    ref RealityWriteCount,
    IntPtr.Zero);