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Accessing text elements in a safearray

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发表于 2021-1-11 20:34:37 | 显示全部楼层 |阅读模式

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问题:
ActiveX interfaces are accessible in C++ through the COM 'wrappers' as the doc
sample, AsdkMfcComSamps. When I used IAcadLayout::GetPlotDeviceNames(), it
returns a VARIANT type 8200. In this case, a string Array.

How do I access the elements in it? Attaching or creating SafeArrays of
COleSafeArray is successful and the upper and lower bounds are clear but I
cannot reach the data (strings).

解答:
This can be done by using some of the safe array global functions. The following
code sample demonstrates how to achieve this.
  1. bool GetStringListFromSafeArray(SAFEARRAY *psaItemTexts, CStringList &strNodes)
  2. {
  3.    ASSERT (psaItemTexts);
  4.    ULONG ulDims = SafeArrayGetDim(psaItemTexts);
  5.    ASSERT (1 == ulDims);
  6.    if (!psaItemTexts || 1 != ulDims)
  7.             return false;

  8.    // see if we are given more than one items
  9.    long lLBound, lUBound; // note that dimension indices are one-based
  10.    HRESULT hRes = SafeArrayGetUBound (psaItemTexts, 1, &lUBound);
  11.    ASSERT (SUCCEEDED(hRes));
  12.    if (FAILED (hRes))
  13.             return false;

  14.    hRes = SafeArrayGetLBound (psaItemTexts, 1, &lLBound);
  15.    ASSERT (SUCCEEDED(hRes));
  16.    if (FAILED (hRes))
  17.             return false;

  18.    // AcDcss the array
  19.    BSTR *pabstrItemTexts = 0;
  20.    hRes = ::SafeArrayAccessData (psaItemTexts, (void**)&pabstrItemTexts);
  21.    ASSERT (SUCCEEDED (hRes));
  22.    if (FAILED (hRes))
  23.             return false;

  24.    strNodes.RemoveAll ();
  25.    USES_CONVERSION;
  26.    for (long lName = lLBound; lName <= lUBound; lName ++)
  27.             strNodes.AddTail (OLE2T (pabstrItemTexts [lName]));
  28.    // release pointer returned by SafeArrayAcDcssData
  29.    SafeArrayUnaccessData (psaItemTexts);

  30.    return true;
  31. }


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