The custom comparer that you develop needs to be installed on any computer that runs a test that includes a bitmap checkpoint that uses the custom comparer.
Make sure that when the custom comparer is installed, the documentation that you provide for the QuickTest user is placed in the location that you specified in the GetHelpFilename method.
In addition, for QuickTest to recognize the COM object that you create as a custom comparer, you must register it to the component category for QuickTest bitmap comparers.
You register a COM object to a component category by listing the relevant component category ID as a registry key under the COM object’s HKEY_CLASSES_ROOT\CLSID\Object’s CLSID\Implemented Categories key.
The component category ID must be registered under the HKEY_CLASSES_ROOT\Component Categories key. When QuickTest is installed, it adds the component category ID for QuickTest bitmap comparers as a registry key in this location.
The component category ID for QuickTest bitmap comparers, CATID_QTPBitmapComparers, is defined in QuickTest installation folder\dat\BitmapCPCustomization\ComponentCategory.h.
When you design your custom comparer, you must ensure that when it is installed on the QuickTest computer, it is also registered to the component category for QuickTest bitmap comparers. This can be achieved in different ways.
If you develop your custom comparer in C++ using Microsoft Visual Studio, you can specify this name in the Type box in the ATL Simple Object Wizard.
If you develop the custom comparer in Visual Basic, this value is automatically set to the COM object’s ProgID. If you want to modify the custom comparer name, you can edit it manually in the registry after the comparer is installed, or design the program that performs the installation and registration to edit this value as well.
If you develop your custom comparer in C++ using Microsoft Visual Studio, you can modify the DllRegisterServer and DllUnregisterServer methods to handle this registration. These methods are called when you run a DLL using the regsvr32.exe program.
If you develop your custom comparer in an environment that does not enable you to modify the registration methods, you can add an additional program that handles this registration and instruct users who install the custom comparer to run this program as well. You can see an example of this type of implementation in the Visual Basic sample custom comparer that QuickTest provides.
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