Starting from the beginning, I've created an installer (game installer) with command prompt.. I want to set a variable for the available graphics memory on the PC which it is currently running ... Something like this ---
set gfxmem=[code here]
if %gfxmem% leq 1000[mb or value] ( echo Low Graphics memory ) else echo Supported
What might be in place of code here?
I searched the world wide web, found quickly How To Identify Your Computer Video Card (The Manual Way) and downloaded the batch file containing the lines:
@echo off
wmic PATH Win32_videocontroller GET description
wmic PATH Win32_videocontroller GET adapterram
wmic PATH Win32_videocontroller GET driverversion
wmic PATH Win32_videocontroller GET pnpdeviceid
pause
I executed the batch file to see what the line with adapterram outputs and could see a line with AdapterRAM and two lines with a byte value because there are two video adapters installed in my computer.
Next I developed following batch code with using coding techniques described in detail in answer on How to get the % of memory utilization using WMIC in batch script? and in the comments of the batch code itself.
@echo off
goto :GetVideoMemorySize
rem Note: MB = MiB and GB = GiB in this batch file, see
rem https://en.wikipedia.org/wiki/Byte for details on GiB.
rem The command WMIC with the parameters PATH Win32_videocontroller GET
rem AdapterRAM outputs one line per video adapter. The output of WMIC is
rem in UTF-16 LE with BOM. The output is redirected to a temporary file
rem which is printed by command TYPE to STDOUT which makes a better job
rem on UNICODE to ASCII conversion as command FOR.
rem Memory of a video adapter is in bytes which can be greater 2^31 (= 2 GB).
rem Windows command processor performs arithmetic operations always with
rem 32-bit signed integer. Therefore 2 GB or more installed video memory
rem exceeds the bit width of a 32-bit signed integer and arithmetic
rem calculations are wrong on 2 GB or more installed video memory. To
rem avoid the integer overflow, a subroutine is called which makes the
rem calculation depending on string value length, i.e. number of bits.
rem Create a copy of current environment variables. Enabling additionally
rem delayed environment variable expansion is not required for this task.
rem Command extensions are enabled by default, but nevertheless enable it.
:GetVideoMemorySize
setlocal EnableExtensions
set "VideoTotalMemory=0"
set "VideoAdapterCount=0"
%SystemRoot%\System32\wbem\wmic.exe PATH Win32_videocontroller GET AdapterRAM >"%TEMP%\AdapterRam.tmp"
for /F "skip=1" %%M in ('type "%TEMP%\AdapterRam.tmp"') do (
set /A VideoAdapterCount+=1
set "VideoAdapterMemory=%%M"
call :AddVideoMemory
)
del "%TEMP%\AdapterRam.tmp"
if "%VideoAdapterCount%" == "1" (
set "AdapterInfo="
) else (
set "AdapterInfo= of %VideoAdapterCount% video adapters"
)
echo Total video memory is: %VideoTotalMemory% MB%AdapterInfo%
echo.
if %VideoTotalMemory% LEQ 1024 (
echo Low Graphics memory
) else (
echo Supported
)
endlocal
goto :EOF
rem This subroutine calculates the total video adapter memory correct
rem only for video adapter memory sizes being either less than 1 GB or
rem an exact multiple of 1 GB. The calculation is wrong for values like
rem 1.5 GB, 2.5 GB and similar values.
rem For a value with not more than 9 characters the memory size in MB
rem can be directly calculated with a division by 1024 * 1024 = 1048576.
rem To avoid an integer overflow on video memory sizes of 1 GB and more,
rem the last 6 characters are removed from bytes value and the remaining
rem characters are divided by 1073 to get the number of GB which is next
rem multiplied with 1024 to get the value in MB.
rem 1 GB = 1.073.741.824 bytes = 2^30
rem 2 GB = 2.147.483.648 bytes = 2^31
rem 4 GB = 4.294.967.296 bytes = 2^32
rem 8 GB = 8.589.934.592 bytes = 2^33
rem 16 GB = 17.179.869.184 bytes = 2^34
rem 32 GB = 34.359.738.368 bytes = 2^35
:AddVideoMemory
if not "%VideoAdapterMemory:~9,1%" == "" goto AtLeast1GB
set /A VideoTotalMemory+=VideoAdapterMemory/1048576
goto :EOF
:AtLeast1GB
set "VideoAdapterMemory=%VideoAdapterMemory:~0,-6%"
set /A VideoTotalMemory+=(VideoAdapterMemory/1073)*1024
goto :EOF
I tested the batch file on Windows XP SP3 x86 and Windows 7 SP1 x64 with administrator privileges and it worked fine on both computers.
See also User Account Control and WMI and Win32_VideoController class. Interesting to read for me was uint32 AdapterRAM on second web page. This would mean that more than 4 GB are not possible for video adapter RAM.
For understanding the used commands and how they work, open a command prompt window, execute there the following commands, and read entirely all help pages displayed for each command very carefully.
call /?del /?echo /?endlocal /?for /?goto /?rem /?setlocal /?set /?type /?wmic /?wmic PATH /?wmic PATH Win32_videocontroller GET /?And read also the Microsoft article Using command redirection operators for an explanation of redirection operator >.