Svenska ElektronikForumet

Kod: Markera allt

char *BufPtrs[3];   // pointer to array of 3 pointers 
char Buffer1[64];      // buffer for description of first device  
char Buffer2[64];      // buffer for description of second device 

// initialize the array of pointers 
BufPtrs[0] = Buffer1; 
BufPtrs[1] = Buffer2; 
BufPtrs[2] = NULL;      // last entry should be NULL 

ftStatus = FT_ListDevices(BufPtrs,&numDevs,FT_LIST_ALL|FT_OPEN_BY_DESCRIPTION); 
if (ftStatus == FT_OK) { 
    // FT_ListDevices OK, product descriptions are in Buffer1 and Buffer2, and  
    // numDevs contains the number of devices connected 
} 
else { 
    // FT_ListDevices failed 
} 

Kod: Markera allt

unsafe
      {
          char*[] BufPtrs;   // pointer to array of 3 pointers 
          char* Buffer1 = stackalloc char[64];
          char* Buffer2 = stackalloc char[64];

          // initialize the array of pointers 
          BufPtrs[0] = Buffer1;
          BufPtrs[1] = Buffer2;
          BufPtrs[2] = null;      // last entry should be NULL

          ftStatus = FT_ListDevices(BufPtrs, &numDevs, FT_LIST_ALL | FT_OPEN_BY_DESCRIPTION);

          if (ftStatus == FT_OK)
          {
              // FT_ListDevices OK, product descriptions are in Buffer1 and Buffer2, and  
              // numDevs contains the number of devices connected 
          }
          else
          {
              // FT_ListDevices failed 
          } 
      }

Kod: Markera allt

using System.Runtime.InteropServices;
...
    class TheDll
    {
        [DllImport("TheDll.dll")]
        public extern static int FT_ListDevices( IntPtr[] pbuffers, ref int numbuffers, int flags);
    }

Kod: Markera allt

...
IntPtr[] buffer = new IntPtr[3];

buffer[0] = Marshal.AllocHGlobal(64);
buffer[1] = Marshal.AllocHGlobal(64);
buffer[2] = IntPtr.Zero;

int numbuf = 0;

int status = TheDll.FT_ListDevices( buffer, ref numbuf, 0);

// retrieve contents into 2 byte[]
byte[] buf1 = new byte[64];
byte[] buf2 = new byte[64];

Marshal.Copy(buffer[0], buf1, 0, 64);
Marshal.Copy(buffer[1], buf2, 0, 64);

Marshal.FreeHGlobal(buffer[0]);
Marshal.FreeHGlobal(buffer[1]);
...