Excel asynchronous UDF

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Is there any article about introducing Excel asynchronous UDF?http://social.msdn.microsoft.com/Forums/office/en-US/25ca9321-4abf-4fb5-a25b-d4ce5c3f54e1/how-to-implement-asynchronous-function-in-excel-2003[^]

Posted 6-Sep-13 21:08pm

moon_lu

Updated 6-Sep-13 23:30pm

Richard MacCutchan

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moon_lu 7-Sep-13 4:26am

Does anybody know how to implement an asynchronous function in Excel 2003? Here is what I want to achieve: after the function is called, return "calculating" to the calling cell, and start calculation. When the calculation finishes, refresh the cell to display the result (note: the return value of the async function is changed but the formula is not).

Richard MacCutchan 7-Sep-13 5:32am

If there is, then google should find it for you.

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moon_lu · Answer 1 · 2013-10-24T15:49:00

VARIANT _stdcall AAs(BSTR pfieldlist)
{

::CoInitialize(NULL);
VARIANT v;v.vt = VT_BSTR;
CComQIPtr<msexcel::_application xmlns:msexcel="#unknown"> spApp(g_Application);

long a = spApp->ThisCell->Row;
long b = spApp->ThisCell->Column;
a++;
CString str;
str.Format("a = %d b = %d",a,b);
OutputDebugString(str);

try {
v= spApp->WorksheetFunction->RTD("Test1.AA.1","",_variant_t(L"AAA"),_variant_t((long)a),_variant_t((long)b);
OutputDebugString("In");
}
catch (CException ex)
{
char szMaxErr[1024] = {0};
ex.GetErrorMessage(szMaxErr, 1024);
OutputDebugString(szMaxErr);
}
return v;

}
The RTD embeded into the UDF,which can realize the async.