private static unsafe Win32Handle CreateHandle(bool async, string fileName)
{
Win32Handle handle;
#if !uap
handle = DllImport.CreateFile(
fileName,
DllImport.FileAccess.GenericWrite,
DllImport.FileShare.Write,
IntPtr.Zero,
DllImport.CreationDisposition.CreateAlways,
async ? DllImport.FileAttributes.Overlapped : DllImport.FileAttributes.Normal,
IntPtr.Zero);
#else
var p = new DllImport.CREATEFILE2_EXTENDED_PARAMETERS();
p.dwSize = (uint)sizeof(DllImport.CREATEFILE2_EXTENDED_PARAMETERS);
p.dwFileAttributes = DllImport.FileAttributes.Normal;
p.dwFileFlags = async ? DllImport.FileAttributes.Overlapped : DllImport.FileAttributes.Normal;
p.dwSecurityQosFlags = (uint)0;
p.lpSecurityAttributes = IntPtr.Zero;
p.hTemplateFile = IntPtr.Zero;
handle = DllImport.CreateFile2(
fileName,
DllImport.FileAccess.GenericWrite,
DllImport.FileShare.Write,
DllImport.CreationDisposition.CreateAlways,
&p);
#endif
if (!handle.IsInvalid)
{
return handle;
}
int errorCode = Marshal.GetLastWin32Error();
string filePath = Path.GetFullPath(fileName);
string message =
$"CreateFile or CreateFile2 failed (error code {errorCode}): {new Win32Exception(errorCode).Message}{Environment.NewLine}" +
$" File name: {fileName}{Environment.NewLine}" +
$" File path: {filePath}{Environment.NewLine}";
if (Directory.Exists(Path.GetDirectoryName(filePath)))
{
try
{
File.WriteAllText(filePath, string.Empty);
message += " Successfully wrote to the file.";
}
catch (Exception ex)
{
message += $" Failed to write to the file: {ex}";
}
}
else
{
message += $" Directory does not exist.";
}
throw new IOException(message);
}
private static unsafe Win32Handle CreateHandle(bool async, string fileName = null)
{
#if !uap
// Assume the current directory is writable
return(DllImport.CreateFile(fileName ?? @"Overlapped.tmp", DllImport.FileAccess.GenericWrite, DllImport.FileShare.Write, IntPtr.Zero, DllImport.CreationDisposition.CreateAlways, async ? DllImport.FileAttributes.Overlapped : DllImport.FileAttributes.Normal, IntPtr.Zero));
#else
var p = new DllImport.CREATEFILE2_EXTENDED_PARAMETERS();
p.dwSize = (uint)sizeof(DllImport.CREATEFILE2_EXTENDED_PARAMETERS);
p.dwFileAttributes = DllImport.FileAttributes.Normal;
p.dwFileFlags = async ? DllImport.FileAttributes.Overlapped : DllImport.FileAttributes.Normal;
p.dwSecurityQosFlags = (uint)0;
p.lpSecurityAttributes = IntPtr.Zero;
p.hTemplateFile = IntPtr.Zero;
return(DllImport.CreateFile2(
fileName ?? @"Overlapped.tmp",
DllImport.FileAccess.GenericWrite,
DllImport.FileShare.Write,
DllImport.CreationDisposition.CreateAlways,
&p));
#endif
}
