vb.net barcode reader from webcam A.2 The Terminal Screen in Software

Draw Denso QR Bar Code in Software A.2 The Terminal Screen

A.2 The Terminal Screen
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The Terminal Screen (Fig. A.4) is where program input and output takes place. This screen has various buttons, a prompt panel, an input box, and a display screen. The display screen is where all the output from the program is displayed. Commands such as Print and Circle, display their results on the screen. The display screen is 800 600 pixels (width height). If you are using a Windows system where the monitor limits are less than 1024 768 resolution, the Terminal Screen will resize to a smaller size. You can nd the limits of the x, y coordinates by using the ScrLimits command (see Sec. C.7). If you get a runtime error or the program is ended the Terminal Screen will remain on top of the editor. You can close it or move it to the background (see below). There is a shortcut key (Ctrl+T ) while in the editor, to reopen the Terminal Screen, or you can use the menu option or the speed button. The display from the previously run program will not be cleared until the current program is executed again or a new program is run.
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FIGURE A.4 The Terminal Screen.
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APPENDICES
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Print "i=",7 //display a string and number Input "Enter a number",j //prompt and wait for an input End
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FIGURE A.5
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Sample input/output program.
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The bottom of the screen is where all input is done using the commands Input, Waitkey, GetKey and GetkeyE (see Sec. C.7). The edit box will only be activated when an Input command is issued. Any entry in the box must be terminated with an Enter. The input box has a buffer that holds any previous inputs. To access a previous input, press Ctrl+P or Ctrl+N to step through prior inputs. This facilitates easy repetition of inputs. When you issue an Input Expr,Var statement, the Expr will be printed just above the edit box as a prompt. If Expr results in a zero length string then character > will be printed as a prompt instead of the null string (see Sec. C.7). Input data is treated as a number if it is a legal number otherwise it will be returned as a string. You can use functions to manipulate inputs as needed (see Sec. C.8). The display shown in Fig. A.4 results from the simple program in Fig. A.5. Notice that the result i 7 is shown in the screen area. The words Enter a number are displayed in the prompting panel and the user input 456 is currently being shown in the input box. The buttons on the bottom right allow certain actions to occur. Each button, just as in the Editor Screen, shows a hint when you place the mouse cursor over it. The button allows you to abort the currently running program and return to the Editor Screen. You can also abort a program by closing the Terminal Screen window. The button allows you to view the Editor Screen. The Editor Screen has a button to display the Terminal Screen again. The program will continue to run when you swap between the Terminal and the Editor Screen; it will not stop. The button causes the screen area to be printed on the default printer. The screen area is printed as a graphic. Only what is visible on the screen will be printed, any output that has scrolled off the screen will not be printed, but see below for how to retrieve any text that has scrolled off the screen. The button will turn on the debugging feature. See the Debug command in Sec. C.7. The buttons and facilitate the use of a special feature of the Terminal Screen that can be a powerful tool. Text printed with the Print command is stored in a buffer, regardless of whether it has scrolled off the screen or not. Once the buffer is full (it holds 8 kb of text) it will clear and start to ll again. If this occurs in the middle of your output the buffer will only be holding part of the output when you use the button. The buffer content can be sent to the Windows clipboard using the button. Once you have done this, the text in the clipboard can be used in any Windows program. The button is used to clear the buffer and the Windows clipboard at the same time. This is needed if you do not want any output from previous program runs to be included when you copy the buffer to the clipboard. Remember to clear the buffer between runs if you desire, but before you start the run.
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