private static bool GetActualEDID(out string DeviceID, List <ScreenInformation> lsi)
{
IntPtr pGuid = Marshal.AllocHGlobal(Marshal.SizeOf(GUID_CLASS_MONITOR));
Marshal.StructureToPtr(GUID_CLASS_MONITOR, pGuid, false);
IntPtr hDevInfo = SetupDiGetClassDevsEx(
pGuid,
null,
IntPtr.Zero,
DIGCF_PRESENT,
IntPtr.Zero,
null,
IntPtr.Zero);
DeviceID = string.Empty;
if (null == hDevInfo)
{
Marshal.FreeHGlobal(pGuid);
return(false);
}
for (int i = 0; Marshal.GetLastWin32Error() != ERROR_NO_MORE_ITEMS; ++i)
{
SP_DEVINFO_DATA devInfoData = new SP_DEVINFO_DATA();
devInfoData.cbSize = Marshal.SizeOf(typeof(SP_DEVINFO_DATA));
if (SetupDiEnumDeviceInfo(hDevInfo, i, ref devInfoData) > 0)
{
UIntPtr hDevRegKey = SetupDiOpenDevRegKey(
hDevInfo,
ref devInfoData,
DICS_FLAG_GLOBAL,
0,
DIREG_DEV,
KEY_READ);
if (hDevRegKey == null)
{
continue;
}
ScreenInformation si = PullEDID(hDevRegKey);
if (si != null)
{
lsi.Add(si);
}
RegCloseKey(hDevRegKey);
}
}
Marshal.FreeHGlobal(pGuid);
return(true);
}
private static ScreenInformation PullEDID(UIntPtr hDevRegKey)
{
ScreenInformation si = null;
StringBuilder valueName = new StringBuilder(128);
uint ActualValueNameLength = 128;
byte[] EDIdata = new byte[1024];
IntPtr pEDIdata = Marshal.AllocHGlobal(EDIdata.Length);
Marshal.Copy(EDIdata, 0, pEDIdata, EDIdata.Length);
int size = 1024;
for (uint i = 0, retValue = ERROR_SUCCESS; retValue != ERROR_NO_MORE_ITEMS; i++)
{
retValue = RegEnumValue(
hDevRegKey, i,
valueName, ref ActualValueNameLength,
IntPtr.Zero, IntPtr.Zero, pEDIdata, ref size); // EDIdata, pSize);
string data = valueName.ToString();
if (retValue != ERROR_SUCCESS || !data.Contains("EDID"))
{
continue;
}
if (size < 1)
{
continue;
}
byte[] actualData = new byte[size];
Marshal.Copy(pEDIdata, actualData, 0, size);
string hex = System.Text.Encoding.ASCII.GetString(actualData);
si = new ScreenInformation
{
Manufacturer = hex.Substring(90, 17).Trim().Replace("\0", string.Empty).Replace("?", string.Empty),
Model = hex.Substring(108, 17).Trim().Replace("\0", string.Empty).Replace("?", string.Empty),
FullEDID = BitConverter.ToString(actualData)
};
}
Marshal.FreeHGlobal(pEDIdata);
return(si);
}
