NSIS Function to get main display refresh rate?

Hi' i'm trying to include a function in my script to detect the refresh rate of the main display. However, I do not know how to incorporate the functions into NSIS code.

I already managed to find a way to get the resolution using the following code:

System::Call user32::GetSystemMetrics(i0)i.r0
System::Call user32::GetSystemMetrics(i1)i.r1

However, in order to obtain the refresh rate, one must use EnumDisplayDevices to get the right display and then pass that to EnumDisplaySettings. I do not know how to do that.

Any help would be much appreciated. I am trying to build a portable application using the portableapps.com framework that uses NSIS language.

Thank you and sorry for being a n00b.

You did say main display which I interpret as the primary monitor.

!define /IfNDef VREFRESH 116
System::Call USER32::GetDC(p0)p.r1
System::Call GDI32::GetDeviceCaps(pr1,i${VREFRESH})i.r0
System::Call USER32::ReleaseDC(p0,pr1)
DetailPrint $0

but

For display devices: the current vertical refresh rate of the device, in cycles per second (Hz).
A vertical refresh rate value of 0 or 1 represents the display hardware's default refresh rate.

Not sure if recent hardware can report 0 or 1 or maybe it was just Win95/98.

https://nsis.sourceforge.io/NSISMultiMon_plug-in can give you some information about the different monitors. https://nsis.sourceforge.io/ChangeRes_plug-in can change it but I don't think it can read it.

It does seem to work but it only returns 0.

!define /IfNDef CCHDEVICENAME 32
!define /IfNDef CCHFORMNAME 32
!define /IfNDef ENUM_CURRENT_SETTINGS -1
!define /IfNDef DM_DISPLAYFREQUENCY 0x00400000
!include LogicLib.nsh
System::Call '*(&i${CCHDEVICENAME},i,&l2,&i2,i0, i,i,i,i, i,i,&i2,&i${CCHFORMNAME},&i2,i,i,i,i,i)p.r1'
System::Call 'USER32::EnumDisplaySettingsA(p0, i${ENUM_CURRENT_SETTINGS}, pr1)i.r0'
System::Call '*$1(&i${CCHDEVICENAME},i,&l2,&i2,i, i,i,i,i, i,i,&i2,&i${CCHFORMNAME},&i2,i,i,i,i,i.r2)'
System::Free $1
${If} $0 <> 0
DetailPrint $2
${EndIf}

for

the current display device on the computer on which the calling thread is running

whatever that means.

Hi, enzeinzen
If still relevant, is this solution suitable for you?



MfG MaGoth, 🙂

No, sadly I didn't manage to find a way to make this work. What I'm trying to do is incorporate this into a PortableApps.com launcher. Getting a function that is so complex to work within the PA.com framework is, however above my level of competence.

For example, this is how obtaining the resolution for further use is done:

${SegmentInit}
System::Call user32::GetSystemMetrics(i0)i.r0
System::Call user32::GetSystemMetrics(i1)i.r1

${SetEnvironmentVariable} ScreenWidth $0
${SetEnvironmentVariable} ScreenHeight $1

What is the problem with the last code I posted?