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Another useful purpose of API calls is to read the keyboard and find out if a certain key has been pressed Events on user forms are used to manage keyboard events, but these only apply to a particular form or a particular control on the form that has the focus at that time For example, suppose you write a macro to do a time-consuming task that involves it looping around thousands of times You may want to give the user a get out command to bring it to a halt if it takes too long You can only do this by checking the keyboard, because the only way you can see a keyboard event is on a UserForm, and this may not have the focus at the time the user presses the get out key You use the API call GetKeyState to do this You must put the following code in the declarations part of a module:
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Private Declare Function GetKeyState Lib "user32" (ByVal nVirtKey As Long) _ As Integer
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This will allow you to examine any key while the program is running You can even differentiate between the left and right SHIFT keys or CTRL keys:
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Sub Test_Key() x = 0 Do Until x = 1 If GetKeyState(&H9) < 0 Then x = 1 DoEvents Loop MsgBox "You pressed the TAB key" End Sub
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This program effectively runs in an infinite loop and has only been done that way for demonstration purposes Normally, you would place the API call somewhere within a loop within your own code so the keyboard can be read while other events are happening This program sets up a simple Do UntilLoop that keeps running until x = 1 This will never happen until the GetKeyState line turns up a value for the specified key that is less than 0 that is, it has been pressed For the purposes of the example, the TAB key is used, which has a value of 09 in hexadecimal When the TAB key is pressed, x changes its value to 1 and exits from the loop The message box is then displayed The DoEvents command is very important here It literally allows the operating system to catch its breath and finish processing all messages before moving onto the next instruction If you do not use this, then the message from the keyboard will not be processed before the next loop is started, and the keypress will be missed Run this code, and it goes into an infinite loop because x will never equal 1 Press any key on the keyboard and nothing happens But press the TAB key, and the program will end with a message box Of course, it helps if you know the values of the virtual key codes if you want to use other key combinations They are listed in Table 20-1
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20: API Calls
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Symbolic Constant Name
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VK_LBUTTON VK_RBUTTON VK_CANCEL VK_MBUTTON VK_BACK VK_TAB VK_CLEAR VK_RETURN VK_SHIFT VK_CONTROL VK_MENU VK_PAUSE VK_CAPITAL VK_ESCAPE VK_SPACE VK_PRIOR VK_NEXT VK_END VK_HOME VK_LEFT VK_UP VK_RIGHT VK_DOWN VK_SELECT VK_EXECUTE VK_SNAPSHOT VK_INSERT
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Value (Hexadecimal)
01 02 03 04 05 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 19 1A 1B 1C 1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D
Mouse or Keyboard Equivalent
Left mouse button Right mouse button
CTRL+BREAK processing
Middle mouse button (three-button mouse) Undefined
BACKSPACE TAB
Undefined
CLEAR ENTER
Undefined
SHIFT CTRL ALT PAUSE CAPS LOCK
Reserved for Kanji systems Undefined
Reserved for Kanji systems
SPACEBAR PAGE UP PAGE DOWN END HOME LEFT ARROW UP ARROW RIGHT ARROW DOWN ARROW SELECT
Original equipment manufacturer (OEM)-specific
EXECUTE PRINT SCREEN INS
Table 20-1
Key Combinations
Microsoft Access 2010 VBA Macro Programming
Symbolic Constant Name
VK_DELETE VK_HELP VK_0 VK_1 VK_2 VK_3 VK_4 VK_5 VK_6 VK_7 VK_8 VK_9 VK_A VK_B VK_C VK_D VK_E VK_F VK_G VK_H VK_I VK_J VK_K VK_L VK_M VK_N VK_O VK_P VK_Q VK_R VK_S VK_T VK_U VK_V
Value (Hexadecimal)
2E 2F 30 31 32 33 34 35 36 37 38 39 3A 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56
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