Code
typedef unsigned short        prWChar;
typedef unsigned long        prUInt32;
typedef prUInt32        prResponse;
#define prCAPI prResponse __declspec(dllexport) prSTDCALL //这个不明白是什么意思
#define prANY    1

typedef struct{
    prWChar ModuleName[512];                /* Module name (512 characters)    */
    prWChar Version[32];                    /* Version (32 characters) */
}prVerInfo;

typedef struct{
    prUInt32  Entry;                        /* Number of modules included 

in this structure */
    prVerInfo VerInfo[prANY];                 /* Array of file version number 

information of PS-ReC SDK modules */
}prDllsVerInfo;

//函数

prCAPI  PR_GetDllsVersion( 
    prUInt32*        pBufferSize,
    prDllsVerInfo*    pDllVersion
);

Code
using System.Runtime.InteropServices;

public struct prVerInfo{
        public ushort[] ModuleName;                /* Module name (512 characters)    */
        public ushort[] Version;                  //32 characters
}

public struct prDllsVerInfo {
        public uint Entry;
        public prVerInfo[] VerInfo;
};

Code
[DllImport("..\\..\\Lib\\PRSDK.dll", CharSet = CharSet.Ansi)]
public static extern uint PR_GetDllsVersion(
     ref uint pBufferSize,
     out prType.prDllsVerInfo pDllVersion
);

Code
prDllsVerInfo prDllVerInfo = new prDllsVerInfo();
prDllVerInfo.VerInfo = new prType.prVerInfo[1];
prDllVerInfo.VerInfo[0].ModuleName = new ushort[512];
prDllVerInfo.VerInfo[0].Version = new ushort[32];

err = CanonCamera.PR_GetDllsVersion(ref buffersize, out prDllVerInfo);