Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Listing device drivers in the system: load addresses, names
Obtaining provider name for a specific type of network
Retrieving various system metrics
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Validating URLs using moniker functions
Reading current hardware profile
Accessing the list of Windows Recent Documents
GDI+: converting text strings to images and saving in a graphics file
Retrieving current settings for an ODBC connection
Setting and retrieving the double-click time for the mouse
Retrieving the names of all sections in an initialization file
Opening the Page Setup dialog box to specify the attributes of a printed page
Using custom Simple MapiSendMail class
Pocket PC: retrieving data from the Contacts Database
Power capabilities of the system: battery, UPS, sleep and hibernation modes, processor throttling
Using the SetErrorMode for determining if a floppy drive is ready
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Using the CopyFile
Who is the first in viewing the Clipboard
Retrieving list of supported paper names (for example, Letter or Legal) for a given printer
Closing Windows
Pocket PC: modifying keys in the System Registry
Listing device drivers in the system: load addresses, names

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More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
DO declare

LOCAL lcBuffer, lnAllocated, lnBytesNeeded, ii,;
    lnLoadAddr, lcBaseName, lcFullName

lnBytesNeeded = 0

* MSDN: 
* It is a good idea to give EnumDeviceDrivers a large array 
* of LPVOID values, because it is hard to predict 
* how many device drivers there will be at the time 
* you call EnumDeviceDrivers. 

lnAllocated = 16384
lcBuffer = Repli(Chr(0), lnAllocated)

IF EnumDeviceDrivers(@lcBuffer, lnAllocated, @lnBytesNeeded) <> 0
    lcBuffer = Left(lcBuffer, lnBytesNeeded)

    * resulting cursor
    CREATE CURSOR csResult (drivername C(30),;
        loadaddr N(12), fullname C(250))

    FOR ii=1 TO lnBytesNeeded/4
        lnLoadAddr = buf2dword(SUBSTR(lcBuffer, (ii-1)*4+1, 4))

        * retrieving the base name
        lcBaseName = SPACE(50)
        = GetDeviceDriverBaseName(lnLoadAddr,;
            @lcBaseName, Len(lcBaseName))
        lcBaseName = Left(lcBaseName, AT(Chr(0),lcBaseName)-1)

        * retrieving the fully qualified path for the driver
        lcFullName = SPACE(250)
        = GetDeviceDriverFileName(lnLoadAddr,;
            @lcFullName, Len(lcFullName))
        lcFullName = Left(lcFullName, AT(Chr(0),lcFullName)-1)

        INSERT INTO csResult VALUES (;
            lcBaseName, lnLoadAddr, lcFullName)
    ENDFOR

    GO TOP
    BROW NORMAL NOWAIT
ENDIF

FUNCTION buf2dword(lcBuffer)
RETURN Asc(SUBSTR(lcBuffer, 1,1)) + ;
    Asc(SUBSTR(lcBuffer, 2,1)) * 256 +;
    Asc(SUBSTR(lcBuffer, 3,1)) * 65536 +;
    Asc(SUBSTR(lcBuffer, 4,1)) * 16777216

PROCEDURE declare
    DECLARE INTEGER EnumDeviceDrivers IN psapi;
        STRING @lpImageBase, INTEGER cb, INTEGER @lpcbNeeded

    DECLARE INTEGER GetDeviceDriverBaseName IN psapi;
        INTEGER ImageBase, STRING @lpBaseName, INTEGER nSize

    DECLARE INTEGER GetDeviceDriverFileName IN psapi;
        INTEGER ImageBase, STRING @lpFilename, INTEGER nSize

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1771 bytes  
Created: 2001-10-25 21:11:38  
Modified: 2010-08-13 20:16:46  
Visits in 7 days: 74  
Listed functions:
EnumDeviceDrivers
GetDeviceDriverBaseName
GetDeviceDriverFileName
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