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#143: How can I check if OLE object is installed?

Sometimes in development if you use OLE automation of some object, your application will not work because application is not installed on client computer. For example, you use MS excel automation but MS Excel is not installed.

You can easy check if OLE object is installed and correctly registered using CLSIDFromProgID function (for MS Excel as example only):

var
  ClassID: TCLSID;
  strOLEObject: string;
begin
  strOLEObject := 'Excel.Application';
  if (CLSIDFromProgID(PWideChar(WideString(strOLEObject)), ClassID) = S_OK)
then
  begin
    <application is installed>
  end
  else
  begin
    <application is NOT installed>
  end
end;

In same manner you can check any other required OLE object.

Published: September 25, 2002

See also

	Viewer for MS Outlook Messages
	dBase Viewer
	ABA Spreadsheet Convert
	Paradox Viewer
	Clarion Viewer
	Fast Document Viewer
	Database Information Manager
	Metafile Convert
	SMImport suite
	Excel Reader (dll)

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