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# Upload the image to OpenGL glTexImage2D( GL_TEXTURE_2D, 0, 3, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, texture_data) clock = pygame.time.Clock() tex_rotation = 0.0 while True: for event in pygame.event.get(): if event.type == QUIT: return time_passed = clock.tick() time_passed_seconds = time_passed / 1000. tex_rotation += time_passed_seconds * 360.0 / 8.0 # Clear the screen (similar to fill) glClear(GL_COLOR_BUFFER_BIT) # Clear the modelview matrix glLoadIdentity() # Set the modelview matrix glTranslatef(0.0, 0.0, -600.0) glRotate(tex_rotation, 1, 0, 0) # Draw a quad (4 vertices, 4 texture coords) glBegin(GL_QUADS) glTexCoord2f(0, 1) glVertex3f(-300, 300, 0) glTexCoord2f(1, 1) glVertex3f(300, 300, 0) glTexCoord2f(1, 0) glVertex3f(300, -300, 0)

For example, you might want to examine the order history in the database to verify that a customer doesn t have any outstanding payments before you allow an invoice to continue To increase performance (by avoiding an extra round-trip) or tighten security, you might choose to perform this check on the server instead of the client Server-side checking also allows you to update business rules without rolling out new client updates..

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Tip If your validation requirements are complex, you might need a way for the client to periodically download a list of rules from the server. This approach makes sure the latest validation rules are always in effect, without forcing you to update clients manually. One of the simplest ways to do this is to use a DataSet that is configured with all the database schema information, including data types and maximum field lengths. However, this won t help you validate more-complex rules (like making sure a phone number field has the right format).

Data Source=localhost/NEWDB;User Id=EDZEHOO;Password=PASS123;

The perfect Windows application would make it impossible for the user to enter any syntactically invalid information; this is achieved by using the right set of controls, checking key presses, and limiting choices. Of course, sometimes this task is too daunting and you need to settle on the next best thing, which is checking for errors after the fact. If you take this approach, it s important that you report any error as soon as possible, preferably before the user continues to enter more information. The easiest way is to react to validation events. Validation events are designed to let you check information as soon as it is entered, rather than waiting for the whole form to be submitted. This kind of instantaneous error-checking is very useful, for the following reasons: Without it, users might be afraid to submit a form, because they know there is a possible error. Users might enter several pieces of invalid data at the same time. If you don t check the data until the form is submitted, your program will have to find some way to report all the mistakes at once. By the time users submit a form, they might have already forgotten about the particular field they entered incorrectly. The validation events avoid these problems by checking the field as soon as the user is finished entering information in it and changes focus to another control (either to enter new information, like choosing a text box, or to perform an action, like clicking a button).

When you navigate from one control to another, a series of events unfolds. For example, if you move from TextBox1 to TextBox2 by pressing the Tab key, here are the events that fire: 1. Leave (TextBox1) 2. Enter (TextBox2) 3. LostFocus (TextBox1) 4. GotFocus (TextBox2) The same pattern plays out when you change focus using other keys (like Shift+Tab), or when your code calls the Control.Select() or Control.SelectNextControl() methods or sets the ContainerControl.ActiveControl property. Oddly enough, if you change focus using the mouse or by calling the Control.Focus() method, the order of events shifts slightly so that the LostFocus event occurs earlier: 1. LostFocus (TextBox1) 2. Leave (TextBox1) 3. Enter (TextBox2) 4. GotFocus (TextBox2)

CHAPTER 11 LIGHTS, CAMERA, ACTION!

The obvious benefit of this mode of authentication is its simplicity. You need only manage a single database account in Oracle (the EDZEHOO account). All the users of your application will be made to access the database through this single database account. You can also almost immediately spot the problem with this arrangement since everyone goes through the same database account, the database has no idea who the actual users are. Audit trails will always reflect EDZEHOO, regardless of whether the accessing user is really Jane, John, or Thomas.

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