Get all monitor handles Topic is solved

[LizardCobra]

How can I get the handles of each of my current monitors? I'll need to know which monitor corresponds to each handle. I figure that if I can get each handle and the corresponding positions, I can determine which ones are left/right/bottom.

I'm using the function

Code: Select all

DllCall("GetMonitorInfo", "Ptr", monitorHandle, "Ptr", &monitorInfo)

to get the info for the monitor. However, I can only find examples of how to get the handle for either the current monitor, or the 'active' monitor, usually defined by whichever monitor currently contains the cursor.

I can get all of the monitor names using MonitorCount and MonitorName, but these don't give me the handles needed to use "GetMonitorInfo".

[swagfag]

Code: Select all

DllCall("EnumDisplayMonitors", "Ptr", 0, "Ptr", 0, "Ptr", RegisterCallback("MonitorEnumProc"), "Ptr", 0)

MonitorEnumProc(hMon, hdc, lpRect, lParam) {

}

where hMon is ur monitor handle to be used with GetMonitorInfo inside the callback proc

[LizardCobra]

When I run that I get the following warning for each argument in MonitorEnumProc: Warning: This variable has not been assigned a value..
Also, how does that determine which monitor the handle represents? Would [*]hMon be the handle for just a single monitor? How would I get the handle for the others?

[swagfag]

https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-enumdisplaymonitors explains what the function does and how it does it

[LizardCobra]

I've already read through that several times, but it doesn't answer any of my questions. It's far to vague, and doesn't give any documentation or examples on how to actually use it.

[LizardCobra]

Where is the handle to each monitor in your example? It looks like since this example passes null values for the first two parameters, it will pass a null handle to the call back function. So what then would the handles that I need get passed to?
Although I can't know how to interpret this, because it refers to the "hdcMonitor", but never defines what that is.

Is there supposed to be anything in the body of the function "MonitorEnumProc?" When/where are the arguments for that function defined?

[lmstearn]

Where is the handle to each monitor in your example? It looks like since this example passes null values for the first two parameters, it will pass a null handle to the call back function. So what then would the handles that I need get passed to?
Although I can't know how to interpret this, because it refers to the "hdcMonitor", but never defines what that is.

Is there supposed to be anything in the body of the function "MonitorEnumProc?" When/where are the arguments for that function defined?

BLTN, A fellow Argonian (was it you?) got a nice explanation on SO, so bumped it here for the readers.

[jNizM]

See a working example here -> https://www.autohotkey.com/boards/viewtopic.php?t=4606

[LizardCobra]

Where is the handle to each monitor in your example? It looks like since this example passes null values for the first two parameters, it will pass a null handle to the call back function. So what then would the handles that I need get passed to?
Although I can't know how to interpret this, because it refers to the "hdcMonitor", but never defines what that is.

Is there supposed to be anything in the body of the function "MonitorEnumProc?" When/where are the arguments for that function defined?

BLTN, A fellow Argonian (was it you?) got a nice explanation on SO, so bumped it here for the readers.

That SO post was me, and the answer I received there was indeed very helpful. Thanks for linking!