Access Extended Camera Registers for DirectShowNet

[tchiex]

Hello all,
I'm trying to implement this interface into either a C++ dll or into the DirectShowNet dll. This interface is used by the PGR type cameras to access any register on the camera. I need to access some of these registers that aren't covered by the standard ProcAMP registers. Any suggestions/guidence would be greatly appreciated.

the C++ API code from PGR for DirectShow:

#include <ks.h> 
#include <ksproxy.h> 
#include "PGRKSMedia.h" 
 
DECLARE_INTERFACE_(IPGRInterface, IUnknown ) 
{ 
STDMETHOD (GetRegister) ( THIS_ long lRegister, long *plValue ) PURE; 
STDMETHOD (SetRegister) ( THIS_ long lRegister, long lValue ) PURE; 
}; 
 

In the PGRKSMedia.h file contains the GUID and structures for the methods:

#include <ks.h> 
#include <ksproxy.h> 
#include <ksmedia.h> 
/** 
* GUID identifying the custom properties that are exported by the driver. 
*/ 
DEFINE_GUID( PROPSETID_CUSTOM, 0xdae50fa6, 0x1dac, 0x4913, 0x98, 0x41, 0x8e, 0xd3, 0xab, 0x3f, 0xeb, 0x4 ); 
 
//=========================================================================== 
// {DAE50FA6-1DAC-4913-9841-8ED3AB3FEB04} 
#define STATIC_PROPSETID_CUSTOM\ 
0xdae50fa6, 0x1dac, 0x4913, 0x98, 0x41, 0x8e, 0xd3, 0xab, 0x3f, 0xeb, 0x4  
// {DAE50FA6-1DAC-4913-9841-8ED3AB3FEB04} 
DEFINE_GUIDSTRUCT("dae50fa6-1dac-4913-9841-8ed3ab3feb04", PROPSETID_CUSTOM); 
#define PROPSETID_CUSTOM DEFINE_GUIDNAMED(PROPSETID_CUSTOM) 
 
/** 
* enumeration of the custom property identifiers. 
*/ 
typedef enum  
{ 
KSPROPERTY_CUSTOM_REGISTER, // RWO 
KSPROPERTY_CUSTOM_FORMAT7, 
} KSPROPERTY_CUSTOM; 
/** 
* Structure used for getting and setting of registers on the camera. 
*/ 
typedef struct  
{ 
KSPROPERTY Property; 
ULONG StreamIndex; 
ULONG ulRegister; 
ULONG ulRegisterValue; 
} KSPROPERTY_CUSTOM_REGISTER_S, *PKSPROPERTY_CUSTOM_REGISTER_S; 
 

I'm assuming to get these to work i would need to be able to define the KSPROPERTY type in C# or create a public interface in C++ i can access in C#.

Thanks for any comments.

[radcaesar]

Refer this, Revert back if u have any issues

http://msdn.microsoft.com/msdnmag/issues/02/08/CQA/

:)

[tchiex]

I was able to convert all the code into C#. See below.

IKsPropertySet pKs = ibf as IKsPropertySet;
            KSPropertySupport dwSupported = new KSPropertySupport();
 
            hr = pKs.QuerySupported(PROPSETID_CUSTOM, (int)KSPROPERTY_CUSTOM.KSPROPERTY_CUSTOM_REGISTER, out dwSupported);
 
            if (dwSupported == (KSPropertySupport.Get | KSPropertySupport.Set))
            {
                hr = 0;
            }
 
            KSPROPERTY_CUSTOM_REGISTER_S cRegisterStr = new KSPROPERTY_CUSTOM_REGISTER_S();
            cRegisterStr.ulRegister = regNumber;
 
            IntPtr regData = Marshal.AllocCoTaskMem(Marshal.SizeOf(cRegisterStr));
            IntPtr instData = Marshal.AllocCoTaskMem(Marshal.SizeOf(cRegisterStr));
            int cbBytes = 0;
 
            Marshal.StructureToPtr(cRegisterStr, regData, true);
            Marshal.StructureToPtr(cRegisterStr, instData, true);
 
            hr = pKs.Get(PROPSETID_CUSTOM,
                (int)KSPROPERTY_CUSTOM.KSPROPERTY_CUSTOM_REGISTER,
                instData,
                Marshal.SizeOf(cRegisterStr),
                regData,
                Marshal.SizeOf(cRegisterStr),
                out cbBytes);
            DsError.ThrowExceptionForHR(hr);
 
            cRegisterStr.ulRegisterValue = regValue;
            Marshal.StructureToPtr(cRegisterStr, regData, true);
            Marshal.StructureToPtr(cRegisterStr, instData, true);
 
            hr = pKs.Set(PROPSETID_CUSTOM,
                (int)KSPROPERTY_CUSTOM.KSPROPERTY_CUSTOM_REGISTER,
                instData,
                Marshal.SizeOf(cRegisterStr),
                regData,
                Marshal.SizeOf(cRegisterStr));
            DsError.ThrowExceptionForHR(hr);
 
            if (regData != IntPtr.Zero)
            {
                Marshal.FreeCoTaskMem(regData);
            }
            if (instData != IntPtr.Zero)
            {
                Marshal.FreeCoTaskMem(instData);
            }
 

Now I just have to figure out why i can't do Marshal.PtrToStructure(regData, cRegisterStr) and pull the information back into a structure to look at.