// This function will display the current power state of the
// device specified by DeviceName (BKL1: for example)
private void GetDevicePowerState(string DeviceName)
{
// get the power state
CE_DEVICE_POWER state = new CE_DEVICE_POWER();
int result = GetDevicePower(DeviceName, 1, ref state);
if (result == ERROR_SUCCESS)
{
// display the results
switch (state)
{
case CE_DEVICE_POWER.PwrDeviceUnspecified:
txtDeviceInfo.Text = "Power State: Unspecified";
break;
case CE_DEVICE_POWER.PwrDeviceMaximum:
txtDeviceInfo.Text = "Power State: Maximum";
break;
default:
txtDeviceInfo.Text = "Power State: " + state.ToString();
break;
}
}
else
{
// display error code in text box
txtDeviceInfo.Text = "Error occurred, code: ";
if (result == 2)
{
txtDeviceInfo.Text += "Device not found";
}
}
}
// This function takes a registry key and recursively enumerates its values
// and subkeys while adding each to the parent TreeNode for displaying
// in the TreeView control
private void PopulateListFromReg(string rootKey, string keyName, ref ListBox parent)
{
// make sure rootKey and keyName aren't empty
if (!rootKey.Equals(""))
{
// list the values first
string Values = Registry.EnumValues(Registry.RootKey.LocalMachine, rootKey, false);
// make sure Values is not null
if (Values != null)
{
// split the coma-delimited return string up into the individual values
string[] ValList = Values.Split(',');
// iterate through each value and add to the tree
// if the device is recognized by GetDevicePower
foreach (string curVal in ValList)
{
if (curVal.StartsWith("Name"))
{
string DeviceName = curVal.Substring(5, curVal.Length - 6);
// check to see if it's recognized by GetDevicePower
// if it's recognized
CE_DEVICE_POWER state = new CE_DEVICE_POWER();
int result = GetDevicePower(DeviceName, 1, ref state);
if (result != 2)
{
parent.Items.Add(DeviceName);
}
}
}
}
// now list the keys
string Keys = Registry.EnumValues(Registry.RootKey.LocalMachine, rootKey, true);
if (Keys != null)
{
string[] KeyList = Keys.Split(',');
// iterate through each subkey and add to the tree
foreach (string curKey in KeyList)
{
if (!curKey.Equals(""))
{
string subKey = rootKey + "\\" + curKey;
PopulateListFromReg(subKey, curKey, ref parent);
}
}
}
}
}
// This function will attempt to set the power state of the specified
// device using both DevicePowerNotify and SetDevicePower. Sometimes
// DevicePowerNotify by itself will not work.
private void SetDevicePowerState(string DeviceName, CE_DEVICE_POWER state)
{
// set the power state
int result = DevicePowerNotify(DeviceName, state, POWER_NAME);
if (result != 0)
{
// Show error code
txtDeviceInfo.Text = "Error in DPN, code: " + result.ToString();
}
result = SetDevicePower(DeviceName, POWER_NAME, state);
if (result != 0)
{
txtDeviceInfo.Text += "\r\nError in SDP, code: " + result.ToString();
}
}
public void btnSetDevicePower_Click(object sender, EventArgs e)
{
// read the device name
string DeviceName = txtDeviceName.Text;
if (DeviceName.Equals(""))
{
return;
}
else
{
CE_DEVICE_POWER state = new CE_DEVICE_POWER();
// determine desired state
if (radD0.Checked)
{
state = CE_DEVICE_POWER.D0;
}
else if (radD1.Checked)
{
state = CE_DEVICE_POWER.D1;
}
else if (radD2.Checked)
{
state = CE_DEVICE_POWER.D2;
}
else if (radD3.Checked)
{
state = CE_DEVICE_POWER.D3;
}
else
{
state = CE_DEVICE_POWER.D4;
}
SetDevicePowerState(DeviceName, state);
// call GetDevicePowerState and auto-update the text box
// so the user knows the (new) current state
GetDevicePowerState(DeviceName);
}
}
private static extern int DevicePowerNotify(
string device, CE_DEVICE_POWER state, int flags);
private static extern int GetDevicePower(
[MarshalAs(UnmanagedType.LPWStr)] string pvDevice, int dwDeviceFlags, ref CE_DEVICE_POWER DeviceState);
private static extern int SetDevicePower(
string pvDevice, int dwDeviceFlags, CE_DEVICE_POWER DeviceState);
// This function will attempt to set the power state of the specified
// device using both DevicePowerNotify and SetDevicePower. Sometimes
// DevicePowerNotify by itself will not work.
private void SetDevicePowerState(string DeviceName, CE_DEVICE_POWER state)
{
// set the power state
int result = DevicePowerNotify(DeviceName, state, POWER_NAME);
if (result != 0)
{
// Show error code
txtDeviceInfo.Text = "Error in DPN, code: " + result.ToString();
}
result = SetDevicePower(DeviceName, POWER_NAME, state);
if (result != 0)
{
txtDeviceInfo.Text += "\r\nError in SDP, code: " + result.ToString();
}
}
public void btnSetDevicePower_Click(object sender, EventArgs e)
{
// read the device name
string DeviceName = txtDeviceName.Text;
if (DeviceName.Equals(""))
{
return;
}
else
{
CE_DEVICE_POWER state = new CE_DEVICE_POWER();
// determine desired state
if (radD0.Checked)
state = CE_DEVICE_POWER.D0;
else if (radD1.Checked)
state = CE_DEVICE_POWER.D1;
else if (radD2.Checked)
state = CE_DEVICE_POWER.D2;
else if (radD3.Checked)
state = CE_DEVICE_POWER.D3;
else
state = CE_DEVICE_POWER.D4;
SetDevicePowerState(DeviceName, state);
// call GetDevicePowerState and auto-update the text box
// so the user knows the (new) current state
GetDevicePowerState(DeviceName);
}
}
// This function takes a registry key and recursively enumerates its values
// and subkeys while adding each to the parent TreeNode for displaying
// in the TreeView control
private void PopulateListFromReg(string rootKey, string keyName, ref ListBox parent)
{
// make sure rootKey and keyName aren't empty
if (!rootKey.Equals(""))
{
// list the values first
string Values = Registry.EnumValues(Registry.RootKey.LocalMachine, rootKey, false);
// make sure Values is not null
if (Values != null)
{
// split the coma-delimited return string up into the individual values
string[] ValList = Values.Split(',');
// iterate through each value and add to the tree
// if the device is recognized by GetDevicePower
foreach (string curVal in ValList)
{
if (curVal.StartsWith("Name"))
{
string DeviceName = curVal.Substring(5, curVal.Length - 6);
// check to see if it's recognized by GetDevicePower
// if it's recognized
CE_DEVICE_POWER state = new CE_DEVICE_POWER();
int result = GetDevicePower(DeviceName, 1, ref state);
if (result != 2)
{
parent.Items.Add(DeviceName);
}
}
}
}
// now list the keys
string Keys = Registry.EnumValues(Registry.RootKey.LocalMachine, rootKey, true);
if (Keys != null)
{
string[] KeyList = Keys.Split(',');
// iterate through each subkey and add to the tree
foreach (string curKey in KeyList)
{
if (!curKey.Equals(""))
{
string subKey = rootKey + "\\" + curKey;
PopulateListFromReg(subKey, curKey, ref parent);
}
}
}
}
}
// This function will display the current power state of the
// device specified by DeviceName (BKL1: for example)
private void GetDevicePowerState(string DeviceName)
{
// get the power state
CE_DEVICE_POWER state = new CE_DEVICE_POWER();
int result = GetDevicePower(DeviceName, 1, ref state);
if (result == ERROR_SUCCESS)
{
// display the results
switch (state)
{
case CE_DEVICE_POWER.PwrDeviceUnspecified:
txtDeviceInfo.Text = "Power State: Unspecified";
break;
case CE_DEVICE_POWER.PwrDeviceMaximum:
txtDeviceInfo.Text = "Power State: Maximum";
break;
default:
txtDeviceInfo.Text = "Power State: " + state.ToString();
break;
}
}
else
{
// display error code in text box
txtDeviceInfo.Text = "Error occurred, code: ";
if (result == 2)
txtDeviceInfo.Text += "Device not found";
}
}
private static extern int SetDevicePower(
string pvDevice, int dwDeviceFlags, CE_DEVICE_POWER DeviceState);
private static extern int GetDevicePower(
[MarshalAs(UnmanagedType.LPWStr)]string pvDevice, int dwDeviceFlags, ref CE_DEVICE_POWER DeviceState);
private static extern int DevicePowerNotify(
string device, CE_DEVICE_POWER state, int flags);
