In inprocserver the methods that an interface expose is specified as pure virtual, therefore when the com class(implementation class) is instantiated the compiler generates Vtable which has address of the interface methods.Now the question is why should we use QuerryInterface() to get an interface pointer when we can get the address of Vtable and subsiquently get the method address?
->why should we use QuerryInterface() to get an interface pointer when we can get the address of Vtable and subsiquently get the method address
Put it simply,because QueryInterface
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Ownerdraw of the grid button. A singleton class implentation and usage.
Continuing from the fifth article about sudoku.
Open the project in visual studio.
Go to the class view – CGridButton should be visible as a class. R…
Entering time in Microsoft Access can be difficult. An input mask often bothers users more than helping them and won't catch all typing errors. This article shows how to create a textbox for 24-hour time input with full validation politely catching …
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel.
Part 1 of this series discussed basic error handling code using VBA.