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Old August 1st, 2006, 01:47 AM
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Default Total Physical Memory mismatch

I have developed a VB app using visual basic 6. This will display the total physical memory in the system and other configuration details.

My system has 512 MB physical memory. If i open My Computer --> Properties, it shows 512 MB of RAM.

But my app shows only 511.01 MB. Why this difference ?

I am using the following Win32 API in my app for getting the total physical memory:

Declare Sub GlobalMemoryStatus Lib "kernel32" (lpBuffer As MEMORYSTATUS)

The function for getting the total physical memory is

Private Function GetMemory() As String
Dim BytesTotal As Double

GlobalMemoryStatus memInfo
BytesTotal = memInfo.dwTotalPhys
GetMemory = Format(CStr((BytesTotal / 1024) / 1024), "0.00")

End Function

Any help is highly appreciated. Please help me...

Thanks in advance.

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Old August 1st, 2006, 01:10 PM
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is it possible that it is just a rounding problem? Check the value of BytesTotal before converting it in a string
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Old August 2nd, 2006, 04:25 PM
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Just a shot in the dark:
    GetMemory = Format((BytesTotal / CDbl(1024)) / CDbl(1024), "0.00")
(the Cstr() is unnecessary, as Format() always converts to String.) This will ensure that the literal numbers are treated as doubles. Might address what Marco mentioned by preventing the quotient being converted to an integer.
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Old April 10th, 2007, 08:08 PM
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Try this:
 int((BytesTotal + 1048575.0) / 1048576.0)

This will round the number up to the highest megabyte. The reason you are getting an unusual number for the physical memory is some of the memory is not accessible between the 640KB to 1024KB memory range. There may also be other memory ranges where the memory is not accessible for memory mapped I/O or ACPI memory ranges. Windows actually rounds up the value in the system properties dialog to make it look "right".

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