C++ SDK Access from C# (Canon SDK)

I'm trying to call a C++ function in an SDK from a C# app.

The function is defined as:

prCAPI PR_GetDeviceList(

prUInt32* pBufferSize,

prDeviceList* pDeviceList

);

where pBufferSize is a pointer to the buffer size and pDeviceList is a pointer to a prDeviceList struct.

prCAPI is an UInt32 and is 0x00 if the function is successful.

## Deliverables

The structs are defined in a header file as the following:

typedef struct{

prWChar DeviceInternalName[512]; /* Internal device name (512 characters) */

prWChar ModelName[32]; /* Camera model name (32 characters) */

prUInt16 Generation; /* Camera generation number */

prUInt32 Reserved1; /* Reserved */

prUInt32 ModelID; /* Camera model ID */

prUInt16 Reserved2; /* Reserved */

prPorttype PortType; /* Port type 0x01?FWIA / 0x02?FSTI */

prUInt32 Reserved3; /* Reserved */

}prDeviceInfoTable;

typedef struct{

prUInt32 NumList; /* Number of camera device information included in this structure */

prDeviceInfoTable DeviceInfo[prANY]; /* Camera device information. This array is variable */

}prDeviceList;

The types are defined as:

unsigned long prCAPI

unsigned ushort prWChar

usigned long prUInt32

unsigned short prUInt16

unsigned short prPorttype

prAny 1

Using InteropServices in C#, I re wrote the function and the structs:

public static extern UInt32 PR_GetDeviceList(ref UInt32 pBufferSize, out IntPtr pDeviceList);

public struct prDeviceList

{

public UInt32 NumList; /* Number of camera device information included in the struct */

public prDeviceInfoTable[] DeviceInfo; /* Camera device information */

}

[StructLayout([url removed, login to view], CharSet=[url removed, login to view])]

public struct prDeviceInfoTable

{

[MarshalAs([url removed, login to view], SizeConst=512)]

public string DeviceInternalName; /* Internal device name (512 characters) */

[MarshalAs([url removed, login to view], SizeConst = 32)]

public string ModelName; /* Camera model name (32 characters) */

public UInt16 Generation; /* Camera generation number */

public UInt32 Reserved1; /* Reserved */

public UInt32 ModelID; /* Camera model ID */

public UInt16 Reserved2; /* Reserved */

public UInt16 PortType; /* Port type 0x01?FWIA / 0x02?FSTI */

public UInt32 Reserved3; /* Reserved */

}

Can anyone tell me how i go about calling the function then retrieve the prDeviceList struct using the pointer and then enumerate the prDeviceInfoTable structs in the array [url removed, login to view]

*************

1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done.

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## Platform

C# - .Net 2.0 - Windows XP Pro

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Project ID: #3526385

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