The purpose of specifying data types is to let TestComplete know the size of memory blocks it should reserve to hold values of structure members and how it should interpret routine parameters and push them to the stack, etc. If the method registers a routine that was registered earlier in the current test or in the previous test (if the ClearSettingsBeforeEachRun option is enabled), it posts a warning message to the test log. Note for Delphi users: the string type is not supported by TestComplete (neither as function parameters, nor as result values). If a function returns a string value (for instance, a char* or wchar_t* value in Visual C++, or an AnsiString or WideString value in Delphi), you will not be able to obtain the function’s result in your test. TestComplete cannot receive string values returned as the results from a DLL function. If a routine does not return any value, ResType must be either vt_empty or vt_void. This parameter is required, and it must always be specified. It can be one of the constants built in TestComplete or an ID generated by DLL.DefineType (or IDLLAccessProcess.DefineType). Function based constraints or domains provide the advantage of instant increase of the length constraint, and on the basis that decreasing a string length constraint is rare, depesz concludes that one of them is usually the best choice for a length limit.The type of the value returned by the function. It also takes a detailed look at alternate ways on constraining the length when needed. The article does detailed testing to show that the performance of inserts and selects for all 4 data types are similar. text – for me a winner – over (n) data types because it lacks their problems, and over varchar – because it has distinct name.
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