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    <p>I think that you must be calling <code>GetMonitorInfo</code> incorrectly. This code:</p> <pre><code>{$APPTYPE CONSOLE} uses SysUtils, MultiMon, Windows, Forms; var i: Integer; MonitorInfo: TMonitorInfoEx; begin MonitorInfo.cbSize := SizeOf(MonitorInfo); for i := 0 to Screen.MonitorCount-1 do begin if not GetMonitorInfo(Screen.Monitors[i].Handle, @MonitorInfo) then RaiseLastOSError; Writeln(MonitorInfo.szDevice); end; Readln; end. </code></pre> <p>produces this output on my machine:</p> <pre> \\.\DISPLAY1 \\.\DISPLAY2 </pre> <p>I suspect that your call to <code>GetMonitorInfo</code> is failing in some way and perhaps you are not checking the return value for errors.</p> <hr> <p>Having searched QualityCentral I suspect you have fallen victim to a known bug in older versions of Delphi: <a href="http://qc.embarcadero.com/wc/qcmain.aspx?d=3239" rel="nofollow">QC#3239</a>. This is reported fixed in version 10.0.2124.6661 which is Delphi 2006.</p> <hr> <p>Your comments confirm this diagnosis. To fix the problem you'll need a new <code>TMonitorInfoEx</code> definition. Here's one that will work on your pre-Unicode Delphi:</p> <pre><code>type TMonitorInfoEx = record cbSize: DWORD; rcMonitor: TRect; rcWork: TRect; dwFlags: DWORD; szDevice: array[0..CCHDEVICENAME - 1] of AnsiChar; end; </code></pre> <p>If you add that to the code above (before you declare the variables of course) then I believe it will resolve your problem.</p> <hr> <p>As an interesting aside, even in XE3, these structs have not been translated correctly: <a href="http://qc.embarcadero.com/wc/qcmain.aspx?d=114460" rel="nofollow">QC#114460</a>. Admittedly the error is rather benign as it only affects <code>PMonitorInfoExA</code> and <code>TMonitorInfoExA</code>, but the error caught me out whilst trying to solve the problem in this question!</p>
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    1. PONeed to resolve HMONITOR --> deviceName (or deviceName --> HMONITOR) in windows
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    1. USDavid Heffernan
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    1. PONeed to resolve HMONITOR --> deviceName (or deviceName --> HMONITOR) in windows
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    1. COwhen i run this on my system i get "the parameter is incorrect" raised as an exception.
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    2. COThat happens when `cbSize` is incorrect. What value of cbSize do you see under the debugger? And which version of Delphi do you have? There's something amiss here. I'm sure we can get to the bottom of it and that API call will work for you.
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      1. USDavid Heffernan
    3. COi am using delphi 7, and Writeln(Format('TMonitorInfoEx = %d TMonitorInfo = %d',[Sizeof(TMonitorInfoEx), sizeof (TMonitorInfo)])) outputs : TMonitorInfoEx = 76 TMonitorInfo = 40
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