SDK FindText problem.

Question

I have 25 PDF files (Client000001.pdf to Client000025.pdf) and every file contain the keyword "- End of Statement - " there. However, when I used FindText availabe in AcroExch.PDDoc SDK. Some files, I can find the text but some file I can't. Is it a bug or something wrong with my VB6 code.
    Dim pdStatement As Object
    Dim pdAVDoc As Object
    Dim strStatementPDFFile As String
    Dim i As Integer
    For i = 1 To 25
        strStatementPDFFile = "c:\Client" & Right("000000" & i, 6) & ".pdf"
        Set pdStatement = CreateObject("AcroExch.PDDoc")
        pdStatement.Open strStatementPDFFile
        Set pdAVDoc = pdStatement.OpenAVDoc("Verify")
        DoEvents
        If pdAVDoc.FindText("- End of Statement -", 0, 0, 0) = False Then
            MsgBox "Why can't find text in this file? " & strStatementPDFFile
        End If
        pdAVDoc.Close 0
        Set pdAVDoc = Nothing
        pdStatement.Close
        Set pdStatement = Nothing
        DoEvents
    Next i
Thanks you for any suggestion. And my Acobat version is 9.1.0.

Answer 1

I have rewritten the code by VS2005 C# as following:
            string strPDFFile;
            AcroAVDoc pdAVDoc;
            for (int i = 1; i <= 25; i++)
                AcroPDDocClass pdStatement = new AcroPDDocClass();
                strPDFFile = "c:\\Client" + RightString("000000" + i.ToString(), 6) + ".pdf";
                pdStatement.Open(strPDFFile);
                pdAVDoc = (AcroAVDoc)pdStatement.OpenAVDoc("Verify");               
                if (!pdAVDoc.FindText("- End of Statement -", 0, 0, 0))
                    MessageBox.Show(strPDFFile);
                pdAVDoc.Close(0);
                pdStatement.Close();
Now, I got a better idea as the FindText only worked for first loop. And I don't think it is anything related to the PDF files itself as I tried to change i started from 1 to 2, 3, 4, 5..etc. It always worked in the first time only. And I think it somehow the Close function do not free the resource/memory etc.
Thanks for any help.