>how do I cast a win32 file handle to an IntPtr?
i ran into this in the past as well; specifically when i started using FTDI USB
devices on DLPdesign development kits. the library is written in c++ MFC code.
After providing data marshal/platform invoke i applied the intptr in c#. The
USB device that I am accessing, passes a file handle to indicate specific pass
/ fail condition. i.e. the first command opens a connection to the device, the
expected handle is 'OK'. if not one of many different possible error messages
is passed in the file handle.
SummaryOpen the device and return a handle which will be used for subsequent
accesses.DefinitionFT_STATUS FT_Open (int iDevice, FT_HANDLE
*ftHandle)ParametersiDevice Index of the device to open. Indices are 0
based.ftHandle Pointer to a variable of type FT_HANDLE where the handle will
bestored. This handle must be used to access the device.Return ValueFT_OK if
successful, otherwise the return value is an FT error code.
public class Wrapper{private static IntPtr m_USBhandler;
[DllImport("FTD2XX.dll", EntryPoint="FT_Open")]public static extern uint
FT_Open(int iDevice, ref IntPtr ftHandle);
[DllImport("FTD2XX.dll", EntryPoint="FT_Close")]public static extern uint
FT_Close(IntPtr ftHandle);
[DllImport("FTD2XX.dll", EntryPoint="FT_Read")]public static extern uint
FT_Read(IntPtr ftHandle, byte[] lpBuffer,uint dwBytesToRead, ref
uintlpdwBytesReturned);
[DllImport("FTD2XX.dll", EntryPoint="FT_Write")]public static extern uint
FT_Write(IntPtr ftHandle, byte[] lpBuffer,uint dwBytesToWrite, ref
uintlpdwBytesWritten);
[DllImport("FTD2XX.dll", EntryPoint="FT_Purge")]public static extern uint
FT_Purge(IntPtr ftHandle, uint dwMask);
public static bool OpenDevice(){if (((FT_Status)Wrapper.FT_Open(1, ref
m_USBhandler)) ==FT_Status.Ok){return true;}else{return false;}}
i hope this helps you by seeing one way of applying file handles in c#.
Ron “The desire that guides me in all I do is the desire to harness the forces
of nature to the service of mankind.”Nikola Tesla“Radio Power Will
Revolutionize the World” (Modern Mechanix & Inventions, July, 1934)
On Tuesday, July 21, 2015 11:12 AM, Dan Lenski <dlen...@gmail.com> wrote:
Ron Harding via PythonDotNet <pythondotnet@...> writes:
> perhaps re-directed command line calls for stdin, stdout, stderr in c#
interacting with python i/o command line calls(although in python it is
common practice to daisy chain commands).
Unfortunately, I cannot redirect the output of the C# library to a
convenient filehandle like stdout/stderr; I need to be specify a
FileStream object.
It pretty much comes down to this: how do I cast a win32 file handle to an
IntPtr?
Thanks,
Dan
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