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Fix PeekNamedPipe Method #23

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Fix PeekNamedPipe Method #23

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12 changes: 8 additions & 4 deletions Drone/Interop/Methods.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -208,15 +208,19 @@ public static bool CreatePipe(out IntPtr hReadPipe, out IntPtr hWritePipe, ref S
return result;
}

public static bool PeekNamedPipe(IntPtr hPipe)
public static bool PeekNamedPipe(IntPtr hPipe, ref uint nbBytesAvailable)
{
object[] parameters = { hPipe, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, (uint)0, IntPtr.Zero };
return (bool)Generic.DynamicApiInvoke(
object[] parameters = { hPipe, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, nbBytesAvailable, IntPtr.Zero };

var result = (bool)Generic.DynamicApiInvoke(
"kernel32.dll",
"PeekNamedPipe",
typeof(PeekNamedPipe),
ref parameters);

nbBytesAvailable = (uint)parameters[4];

return result;
}

public static bool FreeLibrary(IntPtr hModule)
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7 changes: 6 additions & 1 deletion Drone/Utilities/Extensions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,12 @@ public static bool DataAvailable(this TcpClient client)
public static bool DataAvailable(this PipeStream pipe)
{
var hPipe = pipe.SafePipeHandle.DangerousGetHandle();
return Interop.Methods.PeekNamedPipe(hPipe);
uint nbBytesAvailable = 0;
bool result = Interop.Methods.PeekNamedPipe(hPipe, ref nbBytesAvailable);
if (result == false)
throw new System.ComponentModel.Win32Exception("Named Pipe is not available.");

return nbBytesAvailable > 0;
}

public static async Task<byte[]> ReadStream(this Stream stream)
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