asp.net barcode scanning Using the Basic Form of the Command in Objective-C

Encoder QR Code ISO/IEC18004 in Objective-C Using the Basic Form of the Command

Using the Basic Form of the Command
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The basic form of the command allows you to display a simple message in a dialog box along with two buttons, OK and Cancel. Figure 12-1 shows the basic display dialog command and its resulting record, and Figure 12-2 shows the dialog box itself. If you look at the script result in the Result area in Figure 12-1, you will notice that the result is a record with a single property. The label is button returned, and the value is OK. This record will actually have more items in it when you add more parameters to the display dialog command. For now, you can see that the button returned (the button the user clicked) was the OK button.
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CHAPTER 12 INTERACTING WITH THE USER
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Figure 12-1. The basic display dialog command
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Figure 12-2. The dialog box resulting from the basic display dialog command
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Dealing with the Erroneous Cancel Button
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Let s try to run the script and click the Cancel button. Hmm . . . where s the result No record this time What happened is that the display dialog command generates an error when the Cancel button is clicked. You can get more information about it if you trap it using the try...on error control block. Create a new script, and copy the text from the script in Figure 12-3.
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Figure 12-3. Trapping the Cancel button error using the try...on error block
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CHAPTER 12 INTERACTING WITH THE USER
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Now run the script, and click the Cancel button in the first dialog box. This causes the display dialog command on line 2 to generate an error. This error is caught by the enclosing try block, causing the try block to execute its on error portion. As will be explained in detail in 17, you can place a variable name, in this case error_text, immediately after the on error portion on line 3. When the try block catches an error, it assigns the error message string to this variable. The second dialog box will display that error message string. This will be, in effect, your own error message dialog box. As you can see in the dialog box shown in Figure 12-4, the error AppleScript returned was a User canceled error. This error has an error number of 128.
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Figure 12-4. The dialog box showing the error message
Creating Custom Buttons
By default, AppleScript s display dialog command gives you the OK and Cancel buttons. However, you can easily define one, two, or three buttons of your own. To define buttons, you use the buttons parameter followed by a list of button names as strings. Each string will become a button. A list with more than three items will generate an error, and an empty list will prompt AppleScript to use the default OK and Cancel buttons. When running the script in Figure 12-5, the dialog box shown in Figure 12-6 will be displayed. When you click a button in that dialog box, the display dialog command returns a record with a buttoned returned property containing the button s name. For example, the Result area in Figure 12-5 shows the result of clicking the No button.
Figure 12-5. You can create your own dialog box buttons.
CHAPTER 12 INTERACTING WITH THE USER
Figure 12-6. The dialog box with the custom buttons If you use longer names for your buttons, AppleScript will produce a dialog box with wider buttons to try to accommodate your text. In OS X versions prior to Tiger (10.4), all buttons in the dialog box were stretched equally, and the widest button you could have was about 20 characters. In Tiger, buttons are made to fit the size of the button text, which means that if the button titles are longer than a few characters, each button will have its own size. If the titles of all buttons force the dialog box to be wider than 600 pixels, the button titles will get truncated from both ends. You have no way to change the font size or font style of the dialog box. For that kind of control, you need to upgrade your skills to the everything is possible land of AppleScript Studio, FaceSpan, or third-party scripting additions.
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