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Tip of the Day
Language: Visual Basic
Expertise: Intermediate
Aug 19, 1997

Show Free Resources

It is sometimes useful to determine the amount of Windows resources available. You can show percentage of free resources in an about box, for example, or to detect memory leaks in a program. The latter task requires that you continually update the free-resource display so that you can see when the amount of free resources changes. The percentage of free system resources is determined by using the Windows API function GetFreeSystemResources. The declarations for this function are:
 Declare Function GetFreeSystemResources Lib "User" _ (ByVal
fuSysResource As Integer) As Integer 

Global Const GFSR_SYSTEMRESOURCES = &H0 
Global Const GFSR_GDIRESOURCES = &H1 
Global Const GFSR_USERRESOURCES = &H2
To continually update the display, place three labels on your form. Name the labels lblResources and set the indexes to 0, 1, and 2. Next, place a timer on your form called Timer1 and set the interval property to between 500 and 1500. Place this code in the timer event handler:
 Sub Timer1_Timer () 
Dim s As String 
s = CStr(GetFreeSystemResources_ 
(GFSR_SYSTEMRESOURCES)) 
lblResources(0) = "Free System _ 
Resources: " & s & "%" 
s = CStr(GetFreeSystemResources_ 
(GFSR_GDIRESOURCES)) 
lblResources(1) = "Free GDI _ 
Resources: " & s & "%" 
s = CStr(GetFreeSystemResources(GFSR_USERRESOURCES)) 
lblResources(2) = "Free User _ 
Resources: " & s & "%" 
End Sub
Jonathan Wood
 
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