how to get info about my comp.

i want to get info about my system :
(freediskspace,globlsize,OperatingSystem,OperatingSysVer,
VirtualDisks...)

how can i get all that info by API function.

Following site offers an overview of the most common used api functions:
http://www.vbapi.com

Or if you want good examples:
http://www.mvps.org/vb/

I know for certain that you can use
GetDiskFreeSpaceEx to obtain the free disk space

I hope this helps

Try this. Put this code into a Form with a CommandButton.

Code:

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Private Declare Function GetVersionEx Lib "kernel32.dll" Alias "GetVersionExA" (lpVersionInformation As OSVERSIONINFO) As Long
Private Declare Function GetDiskFreeSpaceEx Lib "kernel32.dll" Alias "GetDiskFreeSpaceExA" (ByVal lpDirectoryName As String, lpFreeBytesAvailableToCaller As ULARGE_INTEGER, lpTotalNumberOfBytes As ULARGE_INTEGER, lpTotalNumberOfFreeBytes As ULARGE_INTEGER) As Long
Private Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)

Private Type ULARGE_INTEGER
  LowPart As Long
  HighPart As Long
End Type

Private Type OSVERSIONINFO
  dwOSVersionInfoSize As Long
  dwMajorVersion As Long
  dwMinorVersion As Long
  dwBuildNumber As Long
  dwPlatformId As Long
  szCSDVersion As String * 128
End Type

Dim OsInfo As OSVERSIONINFO
Dim tmp As String
Dim FreeUser As ULARGE_INTEGER
Dim Total As ULARGE_INTEGER
Dim FreeSys As ULARGE_INTEGER
Dim Temp As Currency
Dim fTemp As Currency

Private Sub Command1_Click()

    'Get OS Info
    OsInfo.dwOSVersionInfoSize = Len(OsInfo)
    retval = GetVersionEx(OsInfo)
   
    Select Case OsInfo.dwPlatformId
        Case 0
            tmp = "Windows 3.x"
        Case 1
            tmp = "Windows 95/98"
        Case 2
            tmp = "Windows NT"
    End Select
   
    Print "Version: " & OsInfo.dwMajorVersion & "." & OsInfo.dwMinorVersion
    Print "Build: " & OsInfo.dwBuildNumber
    Print "Platform: " & tmp
 
    'Get DiskSpace
    GetDiskFreeSpaceEx "C:\", FreeUser, Total, FreeSys
    CopyMemory Temp, Total, 8
    CopyMemory fTemp, FreeUser, 8
    Print "Total Space: " & (CCur(Temp) * 10000) / 1000000000 & " GB"
    Print "Free Space: " & (CCur(fTemp) * 10000) / 1000000000 & " GB"
   
End Sub

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If you want to view info like from System Information.

Code:

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Shell "C:\Program Files\Common Files\Microsoft Shared\MSINFO\MSINFO32.EXE", VbNormalFocus

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The SysInfo Control will also work, but the API method is a little more flexible.

Code:

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Private Sub Command1_Click()

    'Print the version of the OS
    Print SysInfo1.OSVersion
   
End Sub

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