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Added TW_ARRAY support to cap writer.

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This commit is contained in:
Eugene Wang 2018-11-25 07:02:32 -05:00
parent b4e1435987
commit cc48fe73dd
1 changed files with 54 additions and 43 deletions
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97
src/NTwain/CapWriter.cs
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@ -72,24 +72,60 @@ namespace NTwain
return twCap;
}
///// <summary>
///// Generates a <see cref="TW_CAPABILITY"/> for use in capability negotiation
///// using TWAIN's array value.
///// </summary>
///// <typeparam name="T"></typeparam>
///// <param name="cap"></param>
///// <param name="value"></param>
///// <returns></returns>
//public TW_CAPABILITY Generate<T>(CapabilityId cap, ArrayValue<T> value)
//{
// var twCap = new TW_CAPABILITY
// {
// Capability = cap,
// ContainerType = ContainerType.Array
// };
// SetOneValue()
// return twCap;
//}
/// <summary>
/// Generates a <see cref="TW_CAPABILITY"/> for use in capability negotiation
/// using TWAIN's array value.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="cap"></param>
/// <param name="value"></param>
/// <returns></returns>
public TW_CAPABILITY Generate<T>(CapabilityId cap, ArrayValue<T> value)
{
var twCap = new TW_CAPABILITY
{
Capability = cap,
ContainerType = ContainerType.Array,
hContainer = config.MemoryManager.Allocate((uint)Marshal.SizeOf(typeof(TW_ARRAY)))
};
if (twCap.hContainer != IntPtr.Zero)
{
var listSz = value.Type.GetSize() * value.ItemList.Length;
TW_ARRAY arr = new TW_ARRAY
{
ItemType = (ushort)value.Type,
NumItems = (uint)value.ItemList.Length,
ItemList = config.MemoryManager.Allocate((uint)listSz)
};
if (arr.ItemList != IntPtr.Zero)
{
IntPtr baseAddr = config.MemoryManager.Lock(arr.ItemList);
try
{
int offset = 0;
foreach (var it in value.ItemList)
{
baseAddr.WriteValue(ref offset, value.Type, it);
}
}
finally
{
config.MemoryManager.Unlock(arr.ItemList);
}
}
try
{
IntPtr baseAddr = config.MemoryManager.Lock(twCap.hContainer);
Marshal.StructureToPtr(arr, baseAddr, false);
}
finally
{
config.MemoryManager.Unlock(twCap.hContainer);
}
}
return twCap;
}
///// <summary>
///// Generates a <see cref="TW_CAPABILITY"/> for use in capability negotiation
@ -170,30 +206,5 @@ namespace NTwain
// Marshal.StructureToPtr(value, _hContainer, false);
// }
//}
//void SetArrayValue(TW_ARRAY value, IMemoryManager memoryManager)
//{
// if (value == null) { throw new ArgumentNullException("value"); }
// ContainerType = ContainerType.Array;
// Int32 valueSize = 6 + value.ItemList.Length * TypeExtensions.GetItemTypeSize(value.ItemType);
// int offset = 0;
// _hContainer = memoryManager.Allocate((uint)valueSize);
// if (_hContainer != IntPtr.Zero)
// {
// IntPtr baseAddr = memoryManager.Lock(_hContainer);
// // can't safely use StructureToPtr here so write it our own
// baseAddr.WriteValue(ref offset, ItemType.UInt16, value.ItemType);
// baseAddr.WriteValue(ref offset, ItemType.UInt32, (uint)value.ItemList.Length);
// foreach (var item in value.ItemList)
// {
// baseAddr.WriteValue(ref offset, value.ItemType, item);
// }
// memoryManager.Unlock(_hContainer);
// }
//}
}
}