Programming Windows (Fifth Edition)

2.7.1. Chapter 7 - BlokOut1

Last updated: 2001/2/26

Description

Press the left mouse button and drag the mouse to draw a black rectangle. Do it again, the first rectangle is erased and a new one is drawn. Resizing the window has no effect on the rectangle (make the window smaller than the rectangle and then bigger and you will still have your original rectangle).

Note that if you exit the client area and release the mouse button, capture1 still believes that the mouse button is pressed when you get back into the client area. After a mouse click it will 'release' it but it will not draw the rectangle.

Wine tests

Just like on Windows.

Winelib tests

Same as with Wine.

2.7.2. Chapter 7 - BlokOut2

Last updated: 2001/2/26

Description

Same as Blokout1 except that this time if you exit the client area the program will continue tracking the mouse.

Wine tests

The basic mouse tracking works fine.
If you get out of the client area by the top or left border Blokout2 believes that you are far far to the right. Would there be a signed/unsigned problem somewhere?
The source of the problem is the following: when the mouse gets into one of the above areas, the WM_MOUSEMOVE message returns coordinates that are interpreted by the program as unsigned shorts and then extended to a signed int instead of first being cast into signed shorts before the extension. The reason this does not cause a problem in Windows 9x is that Windows 9x coordinates are limited to the -32768+32767 range anyway. So when the program tries to draw a rectangle to x=65535 this coordinate is then reinterpreted as a signed short anyway which gives us -1.
The first thing to do is to test this program on Windows NT, to determine if it exhibits the same bug as in Wine (NT might cap the coordinates to 0). Then we must determine if we should check the winver flag in all APIs accepting coordinates, so as to interpret them correctly. See bug #53.

Winelib tests

Same as with Wine.

2.7.3. Chapter 7 - Checker1

Last updated: 2001/2/26

Description

The program divides the window in a checkboard of 25 cells. A click on a cell will display a cross in it and a second click will erase that cross.

When the window is resized the cells are resized accordingly and keep the checked/not checked status. You may see a small variable border around the cells. That's because of rounding errors made by the program.

Wine tests

Works fine except for the resize lag in managed mode.

Winelib tests

Same as with Wine.

2.7.4. Chapter 7 - Checker2

Last updated: 2001/2/26

Description

Same as Checker1 but with an additional keyboard mode. You can move the mouse pointer with the arrow keys, home and end move it respectively to the top left and bottom right corners and you can use space and enter to toggle a cell's status.

Wine tests

Works just as on Windows with the same caveats as for Checker1.

Winelib tests

Same as with Wine.

2.7.5. Chapter 7 - Checker3

Last updated: 2001/2/26

Description

Same as Checker1 but implemented using child windows. Note that this version does not have the keyboard interface of Checker2.

Wine tests

Just like on Windows. This version does not have the resize problems in managed mode.

Winelib tests

Same as with Wine.

2.7.6. Chapter 7 - Checker4

Last updated: 2001/2/28

Description

Same as Checker3, i.e. it is also based on child windows, but adds a keyboard interface. Unlike Checker2, this time the keyboard does not move the mouse but moves the focus from one sub-window to the next. Of course clicking also moves the focus so it all behaves as one would expect.

Wine tests

Works just like on Windows.

Winelib tests

Same as with Wine.

2.7.7. Chapter 7 - Connect

Last updated: 2001/2/26

Description

Connect tracks the mouse movements recording each point's coordinates as long as the left mouse button is depressed. Then it connects each point to all the other points.

If you are outside the client area when you release the mouse button then connect does not do anything. Also if you do the above while it is still drawing the lines nothing happens. To try this move the mouse for some time before releasing the button, connect remembers up to 1000 points which gives it 500,000 lines to draw. But if you release the button after it has finished drawing the lines, then that part of the mouse movements will be taken into account.

Wine tests

Works just like on Windows.

Winelib tests

Same as with Wine.

2.7.8. Chapter 7 - SysMets

Last updated: 2001/2/26

Description

Sorry, no description yet

Wine tests

Sorry, not tested under Wine yet

Winelib tests

Compiles and links fine.

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