Creating an InfoPath Host Application in Visual Studio .NET

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Listing 185: Methods to Query and Execute Commands
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private void ExecuteCommand(EditorUICommand cmd, object parameters, ref object output) { // Don t do anything if the command is not available if (QueryStatusCommand(cmd)) { // Get the command target object from the form control IOleCommandTarget cmdTarget = formControl1GetOcx() as IOleCommandTarget; cmdTargetExec(ref EditorCommandGroup, ConvertToUInt16(cmd), 0, ref parameters, ref output); } } private void ExecuteCommand(EditorUICommand cmd) { object output = null; ExecuteCommand(cmd, null, ref output); } public bool QueryStatusCommand(EditorUICommand cmd) { // Get the command target object from the form control if (formControl1 != null) { IOleCommandTarget commandTarget = formControl1GetOcx() as IOleCommandTarget; OLECMD[] oleCommands = new OLECMD[1]; oleCommands[0]cmdID = ConvertToUInt16(cmd); oleCommands[0]cmdf = 0; commandTargetQueryStatus(ref EditorCommandGroup, 1, oleCommands, IntPtrZero); return (((oleCommands[0]cmdf & (uint)OleCmdfSupported) != 0) && ((oleCommands[0]cmdf & (uint)OleCmdfEnabled) != 0)); } return false; }
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In either case, whether querying or executing, we must rst access the IOleCommandTarget interface through the form control To do this, we call formControl1GetOcx() and cast it to the IOleCommandTarget interface Once you have this interface, you call its methods as you would for
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any other interface When calling the QueryStatus method, we pass the ID of the command in which we are interested (The IDs for each of the commands supported by InfoPath are in the CommandIds enumeration in the FormControlCommandIds class) The current status of the command is returned in the cmdf member variable of the OLECMD structure that we pass to the method The status of the command will be one of the values listed in the OleCmdf enumeration When calling the Exec method, we pass in the ID of the command as usual and any parameters the command may require (Note that not all commands require parameters) If the command returns data, which not all do, it will be returned in the output object
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Now that we have the supporting methods we need in order to query and execute commands, let s see how we can put them to use Let s look at the Cut button rst When the Cut button is pressed, we will handle the button press in a Click event handler called cutButton_Click When this event handler is called, we simply have to call our ExecuteCommand method as follows:
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ExecuteCommand(FormControlCommandIdsCommandIdsCut)
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That s it Now users can click this button to cut text out of the hosted form The Copy, Paste, Undo, and Redo buttons are all equally as simple The only difference is that, in each of these cases, you pass a different command ID from the CommandIds enumeration in the FormControlCommandIds class As we mentioned, the CommandIds enumeration contains all the commands supported by InfoPath You can see the full list of commands by looking at the FormControlCommandIdsCommandIds enumeration in MicrosoftOf ceInfoPathFormControl assembly in the Object Browser in Visual Studio 2005 or by looking at the documentation available in MSDN Most of the commands are self-explanatory and easy to use
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Creating an InfoPath Host Application
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Others, especially those that require additional parameters, will require you to look at the MSDN documentation to see the supported parameters and how to use the command (Unfortunately, there are far too many commands to list in this chapter) Let s look at one of the commands that requires additional parameters the nd command Using this command, we can nd text within the hosted form When the text is found, it will be selected Unlike the simple commands like cut, copy, and paste, which can all be executed in one step, nd is normally at least a two-step process First, you must set the nd string by calling the Exec method with the SetFindString command This command ID requires one parameter the nd string that InfoPath will use for each nd operation until the Exec method is called again with the SetFindString command Once you ve told InfoPath what you want to nd, you then call Exec one more time with the FindReplaceFindNext command to start the nd operation Executing these two commands will give you very basic search functionality However, if you use only these two commands, you will only be able to nd the rst occurrence of the string in the hosted form The basic problem is that, when you execute the SetFindString command, it resets the search Another issue is that if the string you are looking for appears before the current location of the cursor, it won t be found Fortunately, there are commands that enable you to work around these limitations Take a look at Listing 186 which shows the code for the Click event handler for the Find button In this code, we rst execute the GetFindString command This command will return the search string currently being used If the value returned in the output parameter does not match the string in the nd text box, we execute the SetFindString command, passing in the new string to nd (Checking the state of the search criteria before resetting it allows us to search for multiple occurrences of a string in the form If we know that we have already set the search criteria, not setting it again will prevent the problem of being able to nd only one occurrence of a string)
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