Checks whether the specified icon is registered.
bool IsIconRegistered(const QString& qsIconId);
This method checks whether an icon with the specified IconId has been registered. If such an icon has been registered, this method returns true; otherwise it returns false.
The Helper DLL must be installed in order for this method to function correctly. Applications can check to see whether the Helper DLL is installed using the GetModuleVersion method, and install it using the Install method if necessary.
This method returns a Boolean value; after it returns, call the GetLastErrorCode() method to obtain its result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.