Issue
In C++, I don’t seem to be able to iterate the IAcadBlocks to access each IAcadBlock. Is there sample code that does this?
Solution
The following two approaches iterate the IAcadBlocks to access each IAcadBloc. This assumes that you have set up your skeleton ARX/MFC project, importing the tlb of AutoCAD COM library already.
void test()
{
try
{
// get application
IAcadApplicationPtr pIAcad =
acedGetAcadWinApp()->GetIDispatch(TRUE);
// get blocks collection
IAcadBlocksPtr pIBlks =
pIAcad->GetActiveDocument()->GetBlocks();
// count of blocks
long nCnt =pIBlks->GetCount();
for(long i=0; i<nCnt; i++)
{
_variant_t var(i);
// each block
IAcadBlockPtr pIBlk =
pIBlks->Item(var);
BSTR str;
// get block name
pIBlk->get_Name(&str);
_bstr_t bstr(str);
// pop out the block name
AfxMessageBox(bstr);
::SysFreeString(str);
}
}
catch(_com_error& err)
{
AfxMessageBox(err.ErrorMessage());
}
}
If you want to use the #import generated files that come ObjectARX, do it as the following code shows:
static void test()
{
try
{
// get application
IDispatch* pDisp =
acedGetAcadWinApp()->GetIDispatch(TRUE);
if(!pDisp) _com_issue_error(E_POINTER);
CComPtr<IAcadApplication> pIAcad;
pDisp->QueryInterface(IID_IAcadApplication, (void**)&pIAcad);
// get current document
CComPtr<IAcadDocument> pIDoc;
pIAcad->get_ActiveDocument(&pIDoc);
// get blocks collection
CComPtr<IAcadBlocks> pIBlks;
pIDoc->get_Blocks(&pIBlks);
long blksCnt;
pIBlks->get_Count(&blksCnt);
CComPtr<IAcadBlock> pIBlk;
// iterate each block
for(long i=0; i<blksCnt; i++)
{
_variant_t x(i);
pIBlks->Item(x, &pIBlk);
BSTR str;
pIBlk->get_Name(&str);
char buf[256];
buf [0] =0 ;
if(WideCharToMultiByte (CP_ACP,
0,
str,
-1,
buf,
256,
NULL,
NULL))
acutPrintf(_T(“nBlock name %d is: %s”), i, buf);
::SysFreeString(str);
}
}
catch(_com_error& err)
{
AfxMessageBox(err.ErrorMessage());
}
}
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