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DataFlex Examples

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(DataFlex) XML SearchForAttribute Method

Demonstrates the SearchForAttribute method.

The input XML, available at http://www.chilkatsoft.com/data/fruitSearch.xml, is this:

<root>
    <searchRoot>
        <fruit color="red">apple</fruit>
        <fruit color="green">pear</fruit>
        <veg color="orange">carrot</veg>
        <meat animal="cow">beef</meat>
        <xyz>
            <fruit color="blue">blueberry</fruit>
            <veg color="green">broccoli</veg>
        </xyz>
        <fruit color="purple">grape</fruit>
        <cheese color="yellow">cheddar</cheese>
    </searchRoot>
    <fruit color="red">strawberry</fruit>
    <fruit color="orange">peach</fruit>
</root>

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoXml
    Variant vXSearchRoot
    Handle hoXSearchRoot
    Variant vXBeginAfter
    Handle hoXBeginAfter
    Variant vXFound
    Handle hoXFound
    Boolean iSuccess
    Variant vXSearch
    Handle hoXSearch
    String sTemp1
    String sTemp2
    Boolean bTemp1

    Get Create (RefClass(cComChilkatXml)) To hoXml
    If (Not(IsComObjectCreated(hoXml))) Begin
        Send CreateComObject of hoXml
    End

    Get ComLoadXmlFile Of hoXml "qa_data/xml/fruit.xml" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoXml To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Search the sub-tree rooted at "searchRoot"
    Get ComFindChild Of hoXml "searchRoot" To vXSearchRoot
    If (IsComObject(vXSearchRoot)) Begin
        Get Create (RefClass(cComChilkatXml)) To hoXSearchRoot
        Set pvComObject Of hoXSearchRoot To vXSearchRoot
    End
    Get ComLastMethodSuccess Of hoXml To bTemp1
    If (bTemp1 = False) Begin
        Showln "searchRoot not found, searching from root."
        Get ComGetRoot Of hoXml To vXSearchRoot
        If (IsComObject(vXSearchRoot)) Begin
            Get Create (RefClass(cComChilkatXml)) To hoXSearchRoot
            Set pvComObject Of hoXSearchRoot To vXSearchRoot
        End
    End

    // Search for all "fruit" nodes having a color attribute
    // where the name of the color ends in "e"
    Get ComGetSelf Of hoXSearchRoot To vXBeginAfter
    If (IsComObject(vXBeginAfter)) Begin
        Get Create (RefClass(cComChilkatXml)) To hoXBeginAfter
        Set pvComObject Of hoXBeginAfter To vXBeginAfter
    End
    Get ComSearchForAttribute Of hoXSearchRoot vXBeginAfter "fruit" "color" "*e" To vXFound
    If (IsComObject(vXFound)) Begin
        Get Create (RefClass(cComChilkatXml)) To hoXFound
        Set pvComObject Of hoXFound To vXFound
    End
    While ((ComLastMethodSuccess(hoXSearchRoot)) = True)

        Get ComContent Of hoXFound To sTemp1
        Get ComGetAttrValue Of hoXFound "color" To sTemp2
        Showln sTemp1 ": " sTemp2

        Send Destroy of hoXBeginAfter
        Move hoXFound To hoXBeginAfter
        Get ComSearchForAttribute Of hoXSearchRoot vXBeginAfter "fruit" "color" "*e" To vXFound
        If (IsComObject(vXFound)) Begin
            Get Create (RefClass(cComChilkatXml)) To hoXFound
            Set pvComObject Of hoXFound To vXFound
        End
    Loop

    // The correct output is:
    // grape: purple
    // blueberry: blue

    Send Destroy of hoXBeginAfter

    Showln "--------------------------"

    // ---------------------------------------------------------------------------------
    // Now do the same, but instead use SearchForAttribute2
    // which updates the internal reference of the caller instead
    // of returning the found node.

    Get ComGetSelf Of hoXSearchRoot To vXBeginAfter
    If (IsComObject(vXBeginAfter)) Begin
        Get Create (RefClass(cComChilkatXml)) To hoXBeginAfter
        Set pvComObject Of hoXBeginAfter To vXBeginAfter
    End
    Get ComGetSelf Of hoXSearchRoot To vXSearch
    If (IsComObject(vXSearch)) Begin
        Get Create (RefClass(cComChilkatXml)) To hoXSearch
        Set pvComObject Of hoXSearch To vXSearch
    End

    Get ComSearchForAttribute2 Of hoXSearch vXBeginAfter "fruit" "color" "*e" To iSuccess
    While (iSuccess = True)

        Get ComContent Of hoXSearch To sTemp1
        Get ComGetAttrValue Of hoXSearch "color" To sTemp2
        Showln sTemp1 ": " sTemp2

        // Copy the internal references so that the next search
        // begins after the found node.
        Send ComCopyRef To hoXBeginAfter vXSearch
        Send ComCopyRef To hoXSearch vXSearchRoot

        Get ComSearchForAttribute2 Of hoXSearch vXBeginAfter "fruit" "color" "*e" To iSuccess
    Loop

    Send Destroy of hoXSearch
    Send Destroy of hoXBeginAfter

    Send Destroy of hoXSearchRoot


End_Procedure

 

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