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More cap conversions.

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soukoku
2014-09-17 08:07:00 -04:00
parent 782f96827e
commit 8508bbb764
6 changed files with 255 additions and 296 deletions
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87
NTwain/Data/ValueExtensions.cs
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@@ -51,38 +51,42 @@ namespace NTwain.Data
/// <returns></returns>
public static TEnum ConvertToEnum<TEnum>(this object value, bool tryUpperWord) where TEnum : struct,IConvertible
{
var returnType = typeof(TEnum);
// standard int values
if (returnType.IsEnum)
if (value != null)
{
if (tryUpperWord)
var returnType = typeof(TEnum);
// standard int values
if (returnType.IsEnum)
{
// small routine to work with bad sources that may put
// 16bit value in the upper word instead of lower word (as per the twain spec).
var rawType = Enum.GetUnderlyingType(returnType);
if (typeof(ushort).IsAssignableFrom(rawType))
if (tryUpperWord)
{
var intVal = Convert.ToUInt32(value, CultureInfo.InvariantCulture);
var enumVal = GetLowerWord(intVal);
if (!Enum.IsDefined(returnType, enumVal))
// small routine to work with bad sources that may put
// 16bit value in the upper word instead of lower word (as per the twain spec).
var rawType = Enum.GetUnderlyingType(returnType);
if (typeof(ushort).IsAssignableFrom(rawType))
{
return (TEnum)Enum.ToObject(returnType, GetUpperWord(intVal));
var intVal = Convert.ToUInt32(value, CultureInfo.InvariantCulture);
var enumVal = GetLowerWord(intVal);
if (!Enum.IsDefined(returnType, enumVal))
{
return (TEnum)Enum.ToObject(returnType, GetUpperWord(intVal));
}
}
}
// this may work better?
return (TEnum)Enum.ToObject(returnType, value);
//// cast to underlying type first then to the enum
//return (T)Convert.ChangeType(value, rawType);
}
// this may work better?
return (TEnum)Enum.ToObject(returnType, value);
//// cast to underlying type first then to the enum
//return (T)Convert.ChangeType(value, rawType);
else if (typeof(IConvertible).IsAssignableFrom(returnType))
{
// for regular integers and whatnot
return (TEnum)Convert.ChangeType(value, returnType, CultureInfo.InvariantCulture);
}
// return as-is from cap. if caller made a mistake then there should be exceptions
return (TEnum)value;
}
else if (typeof(IConvertible).IsAssignableFrom(returnType))
{
// for regular integers and whatnot
return (TEnum)Convert.ChangeType(value, returnType, CultureInfo.InvariantCulture);
}
// return as-is from cap. if caller made a mistake then there should be exceptions
return (TEnum)value;
return default(TEnum);
}
static ushort GetLowerWord(uint value)
@@ -101,11 +105,40 @@ namespace NTwain.Data
/// <returns></returns>
public static TWFix32 ConvertToFix32(this object value)
{
if (value is TWFix32)
if (value != null)
{
return (TWFix32)value;
if (value is TWFix32)
{
return (TWFix32)value;
}
return (TWFix32)Convert.ToSingle(value, CultureInfo.InvariantCulture);
}
return (TWFix32)Convert.ToSingle(value, CultureInfo.InvariantCulture);
return default(TWFix32);
}
///// <summary>
///// Routine that does nothing.
///// </summary>
///// <param name="value">The value.</param>
///// <returns></returns>
//public static object NoConvertRoutine(object value)
//{
// return value;
//}
///// <summary>
///// Predefined routine for <see cref="string"/>
///// </summary>
///// <param name="value">The value.</param>
///// <returns></returns>
//public static string ConvertToString(object value)
//{
// if (value != null)
// {
// return value.ToString();
// }
// return default(string);
//}
}
}