Answer Q1.http://msdn.microsoft.com/library/en-ccore/html/vcconATLEventHandling.asp Q2.AtlReportError() or CComCoClass::Error()

You can use memcpy to reading the file into a string. You need to get the string's pointer first.

Hi, I have a windows handle which is returned by third party lib, this handle sometimes is valid, sometimes isn't. I want to know whether there is method or function to judge the validity of a handle? Thanks, Jeff Xi

Hi, I have recently moved over atl attributed programming and created a ActiveX Control which is used in a vb 6 application, but when i call a method, like this: ++++vb code+++++ Private Sub Command1_Click() Dim a As Long a = 1 Me.Chh1.test a 'Chh1 is a atl object End Sub ++++ atl code++++ STDMETHODIMP Chh::test(LONG tt) ,vb say that variable "a" has a type mismath error. This atl project has used attributed programming in atl wizard. Then I created another atl project which didn't use attribute programming, every thing is ok. It's so strange! How can I correct this problem? Thanks, Jeff Xi.