BYTE 和 COleVariant 相互轉換

#include <Afxdisp.h>BOOL GetBinaryFromVariant(COleVariant & ovData, BYTE ** ppBuf, unsigned long * pcBufLen){  BOOL fRetVal = FALSE;  //Binary data is stored in the variant as an array of unsigned char  if(ovData.vt == (VT_ARRAY|VT_UI1))  // (OLE SAFEARRAY)  {    //Retrieve size of array    *pcBufLen = ovData.parray->rgsabound[0].cElements;    *ppBuf = new BYTE[*pcBufLen]; //Allocate a buffer to store the data    if(*ppBuf != NULL)    {      void * pArrayData;      //Obtain safe pointer to the array      SafeArrayAccessData(ovData.parray,&pArrayData);      //Copy the bitmap into our buffer      memcpy(*ppBuf, pArrayData, *pcBufLen);      //Unlock the variant data      SafeArrayUnaccessData(ovData.parray);      fRetVal = TRUE;    }  }  return fRetVal;}BOOL PutBinaryIntoVariant(COleVariant * ovData, BYTE * pBuf, unsigned long cBufLen){  BOOL fRetVal = FALSE;  VARIANT var;  VariantInit(&var);  //Initialize our variant  //Set the type to an array of unsigned chars (OLE SAFEARRAY)  var.vt = VT_ARRAY | VT_UI1;  //Set up the bounds structure  SAFEARRAYBOUND  rgsabound[1];  rgsabound[0].cElements = cBufLen;  rgsabound[0].lLbound = 0;  //Create an OLE SAFEARRAY  var.parray = SafeArrayCreate(VT_UI1,1,rgsabound);  if(var.parray != NULL)  {    void * pArrayData = NULL;    //Get a safe pointer to the array    SafeArrayAccessData(var.parray,&pArrayData);    //Copy bitmap to it    memcpy(pArrayData, pBuf, cBufLen);    //Unlock the variant data    SafeArrayUnaccessData(var.parray);    *ovData = var;  // Create a COleVariant based on our variant    VariantClear(&var);    fRetVal = TRUE;  }  return fRetVal;}