| public static NTString ( char buffer ) : string | ||
| buffer | char | |
| return | string | |
public static bool TryGetSerialPortName(HDEVINFO deviceInfoSet, ref SP_DEVINFO_DATA deviceInfoData, out string portName)
{
portName = null;
IntPtr hkey = NativeMethods.SetupDiOpenDevRegKey(deviceInfoSet, ref deviceInfoData);
if (hkey != (IntPtr)(-1))
{
try
{
char[] portNameChars = new char[64]; int portNameLength = 63 * 2;
if (0 == NativeMethods.RegQueryValueEx(hkey, "PortName", 0, IntPtr.Zero, portNameChars, ref portNameLength))
{
Array.Resize(ref portNameChars, portNameLength / 2);
string newPortName = NativeMethods.NTString(portNameChars);
if (newPortName.Length >= 4 && newPortName.StartsWith("COM"))
{
portName = newPortName;
}
}
}
finally
{
NativeMethods.RegCloseKey(hkey);
}
}
return(portName != null);
}
bool TryGetDeviceString(IntPtr handle, Func <IntPtr, char[], int, bool> callback, out string s)
{
char[] buffer = new char[128];
if (!callback(handle, buffer, Marshal.SystemDefaultCharSize * buffer.Length))
{
s = null;
return(Marshal.GetLastWin32Error() == NativeMethods.ERROR_GEN_FAILURE);
}
s = NativeMethods.NTString(buffer); return(true);
}
public static bool TryGetDeviceRegistryProperty(HDEVINFO deviceInfoSet, ref SP_DEVINFO_DATA deviceInfoData, uint property, out string value)
{
value = null;
uint propertyDataType; char[] propertyValueChars = new char[64]; int propertyValueLength = 63 * 2;
if (SetupDiGetDeviceRegistryProperty(deviceInfoSet, ref deviceInfoData, property, out propertyDataType,
propertyValueChars, propertyValueLength, IntPtr.Zero))
{
if (propertyDataType == REG_SZ)
{
value = NativeMethods.NTString(propertyValueChars);
}
}
return(value != null);
}
public override string GetIndexedString(int stringIndex)
{
string indexedString = null;
if (!TryOpenToGetInfo(handle =>
{
char[] buffer = new char[128];
if (!NativeMethods.HidD_GetIndexedString(handle, stringIndex, buffer, Marshal.SystemDefaultCharSize * buffer.Length))
{
return(Marshal.GetLastWin32Error() == NativeMethods.ERROR_GEN_FAILURE);
}
indexedString = NativeMethods.NTString(buffer);
return(true);
}))
{
throw DeviceException.CreateIOException(this, "Failed to get info.");
}
return(indexedString);
}
internal void GetInfoComplete(IntPtr handle)
{
try {
char[] buffer = new char[128];
_manufacturer = NativeMethods.HidD_GetManufacturerString(handle, buffer, 256) ? NativeMethods.NTString(buffer) : "";
_productName = NativeMethods.HidD_GetProductString(handle, buffer, 256) ? NativeMethods.NTString(buffer) : "";
_serialNumber = NativeMethods.HidD_GetSerialNumberString(handle, buffer, 256) ? NativeMethods.NTString(buffer) : "";
IntPtr preparsed;
if (NativeMethods.HidD_GetPreparsedData(handle, out preparsed))
{
NativeMethods.HIDP_CAPS caps;
int statusCaps = NativeMethods.HidP_GetCaps(preparsed, out caps);
if (statusCaps == NativeMethods.HIDP_STATUS_SUCCESS)
{
_maxInput = caps.InputReportByteLength;
_maxOutput = caps.OutputReportByteLength;
_maxFeature = caps.FeatureReportByteLength;
}
NativeMethods.HidD_FreePreparsedData(preparsed);
}
} finally {
NativeMethods.CloseHandle(handle);
}
lock (_completeSync) {
_complete = true;
Monitor.PulseAll(_completeSync);
}
}
