How To How VB Can Get Windows Status Information via API Calls

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SUMMARY

The Visual Basic for Windows sample program below demonstrates how you can obtain system status information similar to the information displayed in the Windows Program Manager About box. The sample program displays the following information using the Windows API functions indicated:
  • The Windows version number with the GetVersion function.
  • The CPU processor type.
  • Whether Windows is running in enhanced mode or standard mode on a 16-bit operating system. This does not apply to Microsoft Windows 95 or Microsoft Windows NT.
  • The amount of free memory.
  • The percentage of free system resources with SystemHeapInfo on a 16-bit operating system. This does not apply to Microsoft Windows 95 or Microsoft Windows NT.
NOTE: The SystemHeapInfo API function is new to Microsoft Windows version
      3.1 and is not available in Microsoft Windows, version 3.0. All other
      API functions listed above are available in both Windows versions 3.0
      or 3.1.
				

MORE INFORMATION

Steps to Create Example Program

  1. Start a new project in Visual Basic. Form1 is created by default.
  2. Add a module to the project.
  3. Add the following code to the General Declarations section of Module1:
       #If Win32 Then
           Type SYSTEM_INFO
                   dwOemID As Long
                   dwPageSize As Long
                   lpMinimumApplicationAddress As Long
                   lpMaximumApplicationAddress As Long
                   dwActiveProcessorMask As Long
                   dwNumberOrfProcessors As Long
                   dwProcessorType As Long
                   dwAllocationGranularity As Long
                   dwReserved As Long
           End Type
           Type OSVERSIONINFO
                   dwOSVersionInfoSize As Long
                   dwMajorVersion As Long
                   dwMinorVersion As Long
                   dwBuildNumber As Long
                   dwPlatformId As Long
                   szCSDVersion As String * 128
           End Type
           Type MEMORYSTATUS
                   dwLength As Long
                   dwMemoryLoad As Long
                   dwTotalPhys As Long
                   dwAvailPhys As Long
                   dwTotalPageFile As Long
                   dwAvailPageFile As Long
                   dwTotalVirtual As Long
                   dwAvailVirtual As Long
           End Type
    
           Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" _
              (LpVersionInformation As OSVERSIONINFO) As Long
           Declare Sub GlobalMemoryStatus Lib "kernel32" (lpBuffer As _
              MEMORYSTATUS)
           Declare Sub GetSystemInfo Lib "kernel32" (lpSystemInfo As _
              SYSTEM_INFO)
    
           Public Const PROCESSOR_INTEL_386 = 386
           Public Const PROCESSOR_INTEL_486 = 486
           Public Const PROCESSOR_INTEL_PENTIUM = 586
           Public Const PROCESSOR_MIPS_R4000 = 4000
           Public Const PROCESSOR_ALPHA_21064 = 21064
       #Else
          ' Constants for GetWinFlags.
          Global Const WF_CPU286 = &H2
          Global Const WF_CPU386 = &H4
          Global Const WF_CPU486 = &H8
          Global Const WF_80x87 = &H400
          Global Const WF_STANDARD = &H10
          Global Const WF_ENHANCED = &H20
          Global Const WF_WINNT = &H4000
    
          ' Type for SystemHeapInfo.
          Type SYSHEAPINFO
             dwSize As Long
             wUserFreePercent As Integer
             wGDIFreePercent As Integer
             hUserSegment As Integer
             hGDISegment As Integer
          End Type
    
          Declare Function GetVersion Lib "kernel" () As Long
          Declare Function GetWinFlags Lib "kernel" () As Long
          'Enter each of the following Declare statements as one, single line:
          Declare Function GetFreeSpace Lib "kernel" (ByVal wFlags As Integer)_
             As Long
          Declare Function GlobalCompact Lib "kernel" _
             (ByVal dwMinFree As Long) As Long
          Declare Function SystemHeapInfo Lib "toolhelp.dll" _
             (shi As SYSHEAPINFO) As Integer
       #End If
    
    					
  4. Enter the following code into the Form_Load procedure of Form1:
       Private Sub Form_Load()
          Dim msg As String         ' Status information.
          Dim nl As String          ' New-line.
          nl = Chr$(13) + Chr$(10)  ' New-line.
    
          Show
          MousePointer = 11   ' Hourglass.
    
          #If Win32 Then
              ' Get operating system and version.
              Dim verinfo As OSVERSIONINFO
              verinfo.dwOSVersionInfoSize = Len(verinfo)
              ret% = GetVersionEx(verinfo)
              If ret% = 0 Then
                  MsgBox "Error Getting Version Information"
                  End
              End If
              Select Case verinfo.dwPlatformId
                  Case 0
                      msg = msg + "Windows 32s "
                  Case 1
                      msg = msg + "Windows 95 "
                  Case 2
                      msg = msg + "Windows NT "
              End Select
    
              ver_major$ = verinfo.dwMajorVersion
              ver_minor$ = verinfo.dwMinorVersion
              build$ = verinfo.dwBuildNumber
              msg = msg + ver_major$ + "." + ver_minor$
              msg = msg + " (Build " + build$ + ")" + nl + nl
    
              ' Get CPU type and operating mode.
              Dim sysinfo As SYSTEM_INFO
              GetSystemInfo sysinfo
              msg = msg + "CPU: "
              Select Case sysinfo.dwProcessorType
                  Case PROCESSOR_INTEL_386
                      msg = msg + "Intel 386" + nl
                  Case PROCESSOR_INTEL_486
                      msg = msg + "Intel 486" + nl
                  Case PROCESSOR_INTEL_PENTIUM
                      msg = msg + "Intel Pentium" + nl
                  Case PROCESSOR_MIPS_R4000
                      msg = msg + "MIPS R4000" + nl
                  Case PROCESSOR_ALPHA_21064
                      msg = msg + "DEC Alpha 21064" + nl
                  Case Else
                      msg = msg + "(unknown)" + nl
    
              End Select
              msg = msg + nl
              ' Get free memory.
              Dim memsts As MEMORYSTATUS
              Dim memory&
              GlobalMemoryStatus memsts
              memory& = memsts.dwTotalPhys
              msg = msg + "Total Physical Memory: "
              msg = msg + Format$(memory& \ 1024, "###,###,###") + "K" + nl
              memory& = memsts.dwAvailPhys
              msg = msg + "Available Physical Memory: "
              msg = msg + Format$(memory& \ 1024, "###,###,###") + "K" + nl
              memory& = memsts.dwTotalVirtual
              msg = msg + "Total Virtual Memory: "
              msg = msg + Format$(memory& \ 1024, "###,###,###") + "K" + nl
              memory& = memsts.dwAvailVirtual
              msg = msg + "Available Virtual Memory: "
              msg = msg + Format$(memory& \ 1024, "###,###,###") + "K" + nl _
                   + nl
    
              ' Get free system resources.
              ' Not applicable to 32-bit operating system (Windows NT).
          #Else
              ' Get operating system and version.
              ver& = GetVersion()
              status& = GetWinFlags()
    
              If status& And WF_WINNT Then
                  msg = msg + "Microsoft Windows NT "
              Else
                  msg = msg + "Microsoft Windows "
              End If
              ver_major$ = Format$(ver& And &HFF)
              ver_minor$ = Format$((ver& And &HFF00) \ &H100, "00")
              msg = msg + ver_major$ + "." + ver_minor$ + nl
    
              ' Get CPU type and operating mode.
              msg = msg + "CPU: "
              If status& And WF_CPU286 Then msg = msg + "80286"
              If status& And WF_CPU386 Then msg = msg + "80386"
              If status& And WF_CPU486 Then msg = msg + "80486"
              If status& And WF_80x87 Then msg = msg + " with 80x87"
              msg = msg + nl
              msg = msg + "Mode: "
              If status& And WF_STANDARD Then msg = msg + "Standard" + nl
              If status& And WF_ENHANCED Then msg = msg + "Enhanced" + nl
    
              ' Get free memory.
              memory& = GetFreeSpace(0)
              msg = msg + "Memory free: "
              msg = msg + Format$(memory& \ 1024, "###,###,###") + "K" + nl
              memory& = GlobalCompact(&HFFFFFFFF)
              msg = msg + "Largest free block: "
              msg = msg + Format$(memory& \ 1024, "###,###,###") + "K" + nl
    
              ' Get free system resources.
              ' The SystemHeapInfo API function became available in Windows
              '  version 3.1.
              msg = msg + "System resources: "
              If ver& >= &H310 Then
                  Dim shi As SYSHEAPINFO
                  shi.dwSize = Len(shi)
                  If SystemHeapInfo(shi) Then
                      If shi.wUserFreePercent < shi.wGDIFreePercent Then
                          msg = msg + Format$(shi.wUserFreePercent) + "%"
                      Else
                          msg = msg + Format$(shi.wGDIFreePercent) + "%"
                      End If
                  End If
              Else
                  msg = msg + "n/a"
              End If
          #End If
          MsgBox msg, 0, "About " + Caption
          MousePointer = 0
       End Sub
    					
  5. Press the F5 key to run the program.

Properties

Article ID: 147886 - Last Review: February 28, 2014 - Revision: 2.1
APPLIES TO
  • Microsoft Visual Basic 5.0 Learning Edition
  • Microsoft Visual Basic 6.0 Learning Edition
  • Microsoft Visual Basic 5.0 Professional Edition
  • Microsoft Visual Basic 6.0 Professional Edition
  • Microsoft Visual Basic 5.0 Enterprise Edition
  • Microsoft Visual Basic 6.0 Enterprise Edition
  • Microsoft Visual Basic 4.0 Standard Edition
  • Microsoft Visual Basic 4.0 Professional Edition
  • Microsoft Visual Basic 4.0 Professional Edition
  • Microsoft Visual Basic 4.0 16-bit Enterprise Edition
  • Microsoft Visual Basic 4.0 32-Bit Enterprise Edition
Keywords: 
kbnosurvey kbarchive kbhowto kbapi KB147886

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