news:1142010894.366280.207910@p10g2000cwp.googlegroups.com...
|I am having a problem with exchanging handles with c# and the
| "CP210xManufacturing.dll" in a device wrapper that i am working on.
|
| I have created a wrapper class to address some of the functions in the
| dll, but not all of them yet. To my knowledge they should be almost
| correct, however this is my first try at exchanging handles between
| legacy code and a managed enviroment. It seems that I am able to get a
| handle from "CP210x_Open," however, I am not able to connect to a
| device using this handle for any further informaiton like
| CP210x_GetDeviceVid.
|
| the "getNumDevice(ref numDevice)" works just fine, so the assumption is
| that the onlything that could be wrong in "getDevicePid(ref siRef, ref
| pid)" is then in the "ref siRef". I am unsure if i am marshaling it
| correctly or if i am using the right level of indirection to get a
| value, but i am getting a value in "open(0, ref siRef)" for siRef so i
| would think that is close. However, the value that I get in c# is
| different than the value I get in c++.
|
| In c++ the value seems to be constant, and in c# the value seems hover
| around a simular value, but is different each time without a logical
| progression.
|
| in c++ i almost always get a value 0x7b8 in my handle
| /* //C++ code
| HANDLE myDevice = {0};
| status = CP210x_Open(0, &myDevice);
| //myDevice = 0x7b8;
| */
|
| class CSepSIChipWrap
| {
| private const string CP210xManu = "CP210xManufacturing.dll";
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_GetNumDevices")]
| public static extern int getNumDevices(
| [In, Out] ref UInt32 deviceNumb);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_Open")]
| public static extern int open(
| [In] UInt32 deviceNumb,
| [In, Out] ref IntPtr deviceHandle);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_Close")]
| public static extern int close(
| [In, Out] ref IntPtr deviceHandle);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDeviceProductString",
| CharSet = CharSet.Ansi)]
| public static extern int getDeviceProductString(
| [In, Out] ref IntPtr deviceHandle,
| [In, Out] ref StringBuilder Product,
| [In, Out] ref byte Length,
| [In] bool ConvertToASCII);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDeviceSerialNumber",
| CharSet = CharSet.Ansi)]
| public static extern int getDeviceSerialNumber(
| [In, Out] ref IntPtr deviceHandle,
| [In, Out] ref StringBuilder Product,
| [In, Out] ref byte Length,
| [In, Out] bool ConvertToASCII);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDeviceVid")]
| public static extern int getDeviceVid(
| [In, Out] ref IntPtr deviceHandle,
| [In, Out] ref ushort Vid);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDevicePid")]
| public static extern int getDevicePid(
| [In, Out] ref IntPtr deviceHandle,
| [In, Out] ref ushort Pid);
| }
|
| void loadSettings(){
| IntPtr siRef = IntPtr.Zero;
| int result = 0;
| uint numDevice = 0;
| result = DeviceWrappers.CSepSIChipWrap.getNumDevices(ref numDevice);
|
| result = DeviceWrappers.CSepSIChipWrap.open(0, ref siRef);
| ushort pid = 0;
| result = DeviceWrappers.CSepSIChipWrap.getDevicePid(ref siRef, ref
| pid);
| //lbDevicePID is a .net text label on a user control
| this.lbDevicePID.Text = pid.ToString();
| }
|

|
| here is the function durring debug
| void loadSettings(){
| IntPtr siRef = IntPtr.Zero;
| int result = 0;
| uint numDevice = 0;
| result = DeviceWrappers.CSepSIChipWrap.getNumDevices(ref numDevice);
| //result = 0 after execute
| result = DeviceWrappers.CSepSIChipWrap.open(0, ref siRef);  //result =
| 0 after execute
| ushort pid = 0;
| result = DeviceWrappers.CSepSIChipWrap.getDevicePid(ref siRef, ref
| pid); //result = 3 after execute "Device IO Failed"
| //pid still equals zero at this point and should be some hex value like
| 0x10c4
| //lbDevicePID is a .net text label on a user control
| this.lbDevicePID.Text = pid.ToString();
| }
|
|
| the handle is the only part that seems to be way off, i use nearly the
| same args for getNumDevices
|
| 5.1. CP210x_GetNumDevices
| Description:This function returns the number of CP210x devices
| connected to the host.
| Supported Devices: CP2101, CP2102, CP2103
| Location: CP210x Manufacturing DLL
| Prototype: CP210x_STATUS CP210x_GetNumDevices( LPDWORD NumDevices )
| Parameters: 1. NumDevices-Address of a DWORD that will contain the
| number of devices.
| Return Value:CP210x_STATUS=CP210x_SUCCESS,
| CP210x_DEVICE_NOT_FOUND,
| CP210x_INVALID_PARAMETER
|
| 5.4. CP210x_Open
| Description:Opens and returns a handle to a device using a device
| number determined by the number returned from CP210x_GetNumDevices().
| Supported Devices: CP2101, CP2102, CP2103
| Location: CP210x Manufacturing DLL
| Prototype: CP210x_STATUS CP210x_Open( DWORD DeviceNum, HANDLE* Handle )
| Parameters: 1. DeviceNum-Device index. 0 for the first device, 1 for
| the second, etc.
| 2.Handle-Pointer to a variable where the handle to the device will be
| stored. This handle will be used for all subsequent accesses to the
| device.
| Return Value:CP210x_STATUS=CP210x_SUCCESS,
| CP210x_DEVICE_NOT_FOUND,
| CP210x_INVALID_PARAMETER
|
| 5.5. CP210x_Close
| Description:Closes an open device handle.
| Supported Devices: CP2101, CP2102, CP2103
| Location: CP210x Manufacturing DLL
| Prototype: CP210x_STATUS CP210x_Close( HANDLE Handle )
| Parameters: 1. Handle-Handle to the device to close as returned by
| CP210x_Open().
| Return Value:CP210x_STATUS=CP210x_SUCCESS,
| CP210x_INVALID_HANDLE
|
| 5.18. CP210x_GetDevicePid
| Description:Returns the 2-byte Product ID field of the Device
| Descriptor contained in EEPROM of a CP210x device.
| Supported Devices: CP2101, CP2102, CP2103
| Location: CP210x Manufacturing DLL
| Prototype: CP210x_STATUS CP210x_GetDevicePid( HANDLE Handle, LPWORD Pid
| )
| Parameters: 1. Handle-Handle to the device to close as returned by
| CP210x_Open().
| 2.PID-Pointer to a 2-byte value that returns the Product ID of the
| CP210x device.
| Return Value:CP210x_STATUS=CP210x_SUCCESS,
| CP210x_INVALID_PARAMETER,
| CP210x_INVALID_HANDLE,
| CP210x_DEVICE_IO_FAILED
|
| // Return codes
| #define CP210x_SUCCESS 0x00
| #define CP210x_DEVICE_NOT_FOUND 0xFF
| #define CP210x_INVALID_HANDLE 0x01
| #define CP210x_INVALID_PARAMETER 0x02
| #define CP210x_DEVICE_IO_FAILED 0x03
| #define CP210x_FUNCTION_NOT_SUPPORTED 0x04
| #define CP210x_GLOBAL_DATA_ERROR 0x05
| #define CP210x_FILE_ERROR 0x06
| #define CP210x_COMMAND_FAILED 0x08
| #define CP210x_INVALID_ACCESS_TYPE 0x09
|

| class CSepSIChipWrap
| {
| private const string CP210xManu = "CP210xManufacturing.dll";
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_GetNumDevices")]
| public static extern int getNumDevices(
| [In, Out] ref UInt32 deviceNumb);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_Open")]
| public static extern int open(
| [In] UInt32 deviceNumb,
| [In, Out] IntPtr deviceHandle);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_Close")]
| public static extern int close(
| [In, Out] IntPtr deviceHandle);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDeviceProductString",
| CharSet = CharSet.Ansi)]
| public static extern int getDeviceProductString(
| [In, Out] IntPtr deviceHandle,
| [In, Out] ref StringBuilder Product,
| [In, Out] ref byte Length,
| [In] bool ConvertToASCII);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDeviceSerialNumber",
| CharSet = CharSet.Ansi)]
| public static extern int getDeviceSerialNumber(
| [In, Out] IntPtr deviceHandle,
| [In, Out] ref StringBuilder Product,
| [In, Out] ref byte Length,
| [In, Out] bool ConvertToASCII);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDeviceVid")]
| public static extern int getDeviceVid(
| [In, Out] IntPtr deviceHandle,
| [In, Out] ref ushort Vid);
|
| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDevicePid")]
| public static extern int getDevicePid(
| [In, Out] IntPtr deviceHandle,
| [In, Out] ref ushort Pid);
| }




| here is the function durring debug
void loadSettings(){

news:1142024300.131697.143830@i39g2000cwa.googlegroups.com...
|I tested that before with no, luck.
|
| So, just to be sure i made the appropriate changes and tried it agian.
| | class CSepSIChipWrap
|| {
|| private const string CP210xManu = "CP210xManufacturing.dll";
||
|| [DllImport(CP210xManu, EntryPoint = "CP210x_GetNumDevices")]
|| public static extern int getNumDevices(
|| [In, Out] ref UInt32 deviceNumb);
||
|| [DllImport(CP210xManu, EntryPoint = "CP210x_Open")]
|| public static extern int open(
|| [In] UInt32 deviceNumb,
|| [In, Out] IntPtr deviceHandle);
||
|| [DllImport(CP210xManu, EntryPoint = "CP210x_Close")]
|| public static extern int close(
|| [In, Out] IntPtr deviceHandle);
||
|| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDeviceProductString",
|| CharSet = CharSet.Ansi)]
|| public static extern int getDeviceProductString(
|| [In, Out] IntPtr deviceHandle,
|| [In, Out] ref StringBuilder Product,
|| [In, Out] ref byte Length,
|| [In] bool ConvertToASCII);
||
|| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDeviceSerialNumber",
|| CharSet = CharSet.Ansi)]
|| public static extern int getDeviceSerialNumber(
|| [In, Out] IntPtr deviceHandle,
|| [In, Out] ref StringBuilder Product,
|| [In, Out] ref byte Length,
|| [In, Out] bool ConvertToASCII);
||
|| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDeviceVid")]
|| public static extern int getDeviceVid(
|| [In, Out] IntPtr deviceHandle,
|| [In, Out] ref ushort Vid);
||
|| [DllImport(CP210xManu, EntryPoint = "CP210x_GetDevicePid")]
|| public static extern int getDevicePid(
|| [In, Out] IntPtr deviceHandle,
|| [In, Out] ref ushort Pid);
|| }
|
|
|
|
| | here is the function durring debug
| void loadSettings(){
| IntPtr siRef = IntPtr.Zero;
| int result = 0;
| uint numDevice = 0;
| result = DeviceWrappers.CSepSIChipWrap.getNumDevices(ref numDevice);
| //result = 0 after execute
| result = DeviceWrappers.CSepSIChipWrap.open(0, siRef);  //result =1
| siRef = 0 after execute ushort pid = 0;
| result = DeviceWrappers.CSepSIChipWrap.getDevicePid(siRef, ref pid);
| //result = 3 after execute "Device IO Failed"
| //pid still equals zero at this point and should be some hex value like
| 0x10c4
| //lbDevicePID is a .net text label on a user control
| this.lbDevicePID.Text = pid.ToString();
| }
|
| this asures me that the handle is the problem in the statement
| getDevicePid because the same error is reported in both circuimstances.
|
| Device Manager reports the device as being there.
|
| It also seems that "ref IntPtr var" is more correct than "IntPtr var"