WriteFile有时会返回错误代码6

Question

以下是代码段：

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模式下使用该文件，则需要指向OVERLAPPED结构的指针，否则确保在不关闭句柄的情况下多次调用CreateFile。

在拨打电话＆＃34; WriteFile＆＃34;之前，检查是否多次调用CreateFile（不关闭先前创建的句柄）。在这种情况下，系统可以返回错误6。

Answer 2

溶剂是：

isEqualTo

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,
    ref DriverEntity.OVERLAPPED lpOverlapped);

使用：

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