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Test reading some values boxed.

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This commit is contained in:
Eugene Wang
2025-11-20 22:36:36 -05:00
parent 2ae7293c44
commit de788ce91d
2 changed files with 224 additions and 1 deletions
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src/NTwain/Data/TWAINH_EXTRAS.cs
+1 -1
View File
@@ -258,7 +258,7 @@ namespace NTwain.Data
/// A more dotnet-friendly representation of <see cref="TW_ENUMERATION"/>. /// A more dotnet-friendly representation of <see cref="TW_ENUMERATION"/>.
/// </summary> /// </summary>
/// <typeparam name="TValue"></typeparam> /// <typeparam name="TValue"></typeparam>
public class Enumeration<TValue> where TValue : struct public class Enumeration<TValue>
{ {
public int CurrentIndex; public int CurrentIndex;
src/NTwain/Data/ValueReader.cs
+223
View File
@@ -84,6 +84,52 @@ namespace NTwain.Data
} }
/// <summary>
/// Reads a boxed one value out of a cap. This can only be done once if memory is freed.
/// </summary>
/// <typeparam name="TValue"></typeparam>
/// <param name="cap"></param>
/// <param name="memMgr"></param>
/// <param name="freeMemory"></param>
/// <returns></returns>
public static object? ReadOneValueBoxed(this ref TW_CAPABILITY cap, IMemoryManager memMgr, bool freeMemory = true)
{
if (cap.ConType != TWON.ONEVALUE || cap.hContainer == IntPtr.Zero) return default;
var lockedPtr = memMgr.Lock(cap.hContainer);
try
{
TWTY itemType;
// Mac has a level of indirection and a different structure (ick)...
if (TWPlatform.IsMacOSX)
{
// Crack the container...
var onevalue = MarshalTo<TW_ONEVALUE_MACOSX>(lockedPtr);
itemType = (TWTY)onevalue.ItemType;
lockedPtr += Marshal.SizeOf(onevalue);
}
else
{
// Crack the container...
var onevalue = MarshalTo<TW_ONEVALUE>(lockedPtr);
itemType = onevalue.ItemType;
lockedPtr += Marshal.SizeOf(onevalue);
}
return ReadTWTYDataBoxed(lockedPtr, itemType, 0);
}
finally
{
if (lockedPtr != IntPtr.Zero) memMgr.Unlock(cap.hContainer);
if (freeMemory)
{
memMgr.Free(cap.hContainer);
cap.hContainer = IntPtr.Zero;
}
}
}
/// <summary> /// <summary>
/// Reads a one value out of a cap. This can only be done once if memory is freed. /// Reads a one value out of a cap. This can only be done once if memory is freed.
/// </summary> /// </summary>
@@ -130,6 +176,78 @@ namespace NTwain.Data
} }
} }
public static Enumeration<object> ReadEnumerationBoxed(this ref TW_CAPABILITY cap, IMemoryManager memMgr, bool freeMemory = true)
{
Enumeration<object> retVal = new();
if (cap.ConType != TWON.ENUMERATION || cap.hContainer == IntPtr.Zero) return retVal;
var lockedPtr = memMgr.Lock(cap.hContainer);
try
{
TWTY itemType;
int count = 0;
// Mac has a level of indirection and a different structure (ick)...
if (TWPlatform.IsMacOSX)
{
// Crack the container...
var twenumerationmacosx = MarshalTo<TW_ENUMERATION_MACOSX>(lockedPtr);
itemType = (TWTY)twenumerationmacosx.ItemType;
count = (int)twenumerationmacosx.NumItems;
retVal.DefaultIndex = (int)twenumerationmacosx.DefaultIndex;
retVal.CurrentIndex = (int)twenumerationmacosx.CurrentIndex;
lockedPtr += Marshal.SizeOf(twenumerationmacosx);
}
// Windows or the 2.4+ Linux DSM...
else
{
// Crack the container...
var twenumeration = MarshalTo<TW_ENUMERATION>(lockedPtr);
itemType = twenumeration.ItemType;
count = (int)twenumeration.NumItems;
retVal.DefaultIndex = (int)twenumeration.DefaultIndex;
retVal.CurrentIndex = (int)twenumeration.CurrentIndex;
lockedPtr += Marshal.SizeOf(twenumeration);
}
// The -2.3 Linux DSM...
//else if (twain.m_blFound020302Dsm64bit && (twain.m_linuxdsm == TWAIN.LinuxDsm.Is020302Dsm64bit))
//{
// // Crack the container...
// var twenumerationlinux64 = MarshalTo<TW_ENUMERATION_LINUX64>(lockedPtr);
// itemType = twenumerationlinux64.ItemType;
// count = (int)twenumerationlinux64.NumItems;
// retVal.DefaultIndex = (int)twenumerationlinux64.DefaultIndex;
// retVal.CurrentIndex = (int)twenumerationlinux64.CurrentIndex;
// lockedPtr += Marshal.SizeOf(twenumerationlinux64);
//}
// This shouldn't be possible, but what the hey...
//else
//{
// Log.Error("This is serious, you win a cookie for getting here...");
// return retVal;
//}
retVal.Items = new object[count];
for (var i = 0; i < count; i++)
{
retVal.Items[i] = ReadTWTYDataBoxed(lockedPtr, itemType, i);
}
}
finally
{
if (lockedPtr != IntPtr.Zero) memMgr.Unlock(cap.hContainer);
if (freeMemory)
{
memMgr.Free(cap.hContainer);
cap.hContainer = IntPtr.Zero;
}
}
return retVal;
}
public static Enumeration<TValue> ReadEnumeration<TValue>(this ref TW_CAPABILITY cap, IMemoryManager memMgr, bool freeMemory = true) where TValue : struct public static Enumeration<TValue> ReadEnumeration<TValue>(this ref TW_CAPABILITY cap, IMemoryManager memMgr, bool freeMemory = true) where TValue : struct
{ {
Enumeration<TValue> retVal = new(); Enumeration<TValue> retVal = new();
@@ -202,6 +320,53 @@ namespace NTwain.Data
return retVal; return retVal;
} }
public static IList<object> ReadArrayBoxed(this ref TW_CAPABILITY cap, IMemoryManager memMgr, bool freeMemory = true)
{
if (cap.ConType != TWON.ARRAY || cap.hContainer == IntPtr.Zero) return Array.Empty<object>();
var lockedPtr = memMgr.Lock(cap.hContainer);
try
{
TWTY itemType;
uint count;
// Mac has a level of indirection and a different structure (ick)...
if (TWPlatform.IsMacOSX)
{
// Crack the container...
var twarraymacosx = MarshalTo<TW_ARRAY_MACOSX>(lockedPtr);
itemType = (TWTY)twarraymacosx.ItemType;
count = twarraymacosx.NumItems;
lockedPtr += Marshal.SizeOf(twarraymacosx);
}
else
{
// Crack the container...
var twarray = MarshalTo<TW_ARRAY>(lockedPtr);
itemType = twarray.ItemType;
count = twarray.NumItems;
lockedPtr += Marshal.SizeOf(twarray);
}
var arr = new object[count];
for (var i = 0; i < count; i++)
{
arr[i] = ReadTWTYDataBoxed(lockedPtr, itemType, i);
}
return arr;
}
finally
{
if (lockedPtr != IntPtr.Zero) memMgr.Unlock(cap.hContainer);
if (freeMemory)
{
memMgr.Free(cap.hContainer);
cap.hContainer = IntPtr.Zero;
}
}
}
public static IList<TValue> ReadArray<TValue>(this ref TW_CAPABILITY cap, IMemoryManager memMgr, bool freeMemory = true) where TValue : struct public static IList<TValue> ReadArray<TValue>(this ref TW_CAPABILITY cap, IMemoryManager memMgr, bool freeMemory = true) where TValue : struct
{ {
if (cap.ConType != TWON.ARRAY || cap.hContainer == IntPtr.Zero) return Array.Empty<TValue>(); if (cap.ConType != TWON.ARRAY || cap.hContainer == IntPtr.Zero) return Array.Empty<TValue>();
@@ -373,6 +538,64 @@ namespace NTwain.Data
} }
/// <summary>
/// Read the pointer content as a boxed value specified by <see cref="TWTY"/>, except <see cref="TWTY.HANDLE"/>.
/// </summary>
/// <param name="intptr">A locked pointer to the data pointer. If data is array this is the 0th item.</param>
/// <param name="type">The twain type.</param>
/// <param name="itemIndex">Index of the item if pointer is array.</param>
/// <returns></returns>
public static object ReadTWTYDataBoxed(this IntPtr intptr, TWTY type, int itemIndex)
{
switch (type)
{
default:
throw new NotSupportedException($"Unsupported item type {type} for reading.");
// TODO: verify if needs to read int32 for small types
case TWTY.HANDLE:
intptr += IntPtr.Size * itemIndex;
return MarshalTo<IntPtr>(intptr);
case TWTY.INT8:
intptr += 1 * itemIndex;
return MarshalTo<sbyte>(intptr);
case TWTY.UINT8:
intptr += 1 * itemIndex;
return MarshalTo<byte>(intptr);
case TWTY.INT16:
intptr += 2 * itemIndex;
return MarshalTo<short>(intptr);
case TWTY.BOOL:
case TWTY.UINT16:
intptr += 2 * itemIndex;
return MarshalTo<ushort>(intptr);
case TWTY.INT32:
intptr += 4 * itemIndex;
return MarshalTo<int>(intptr);
case TWTY.UINT32:
intptr += 4 * itemIndex;
return MarshalTo<uint>(intptr);
case TWTY.FIX32:
intptr += 4 * itemIndex;
return MarshalTo<TW_FIX32>(intptr);
case TWTY.FRAME:
intptr += 16 * itemIndex;
return MarshalTo<TW_FRAME>(intptr);
case TWTY.STR32:
intptr += TW_STR32.Size * itemIndex;
return MarshalTo<TW_STR32>(intptr);
case TWTY.STR64:
intptr += TW_STR64.Size * itemIndex;
return MarshalTo<TW_STR64>(intptr);
case TWTY.STR128:
intptr += TW_STR128.Size * itemIndex;
return MarshalTo<TW_STR128>(intptr);
case TWTY.STR255:
intptr += TW_STR255.Size * itemIndex;
return MarshalTo<TW_STR255>(intptr);
}
}
/// <summary> /// <summary>
/// Read the pointer content as a value specified by <see cref="TWTY"/>, except <see cref="TWTY.HANDLE"/>. /// Read the pointer content as a value specified by <see cref="TWTY"/>, except <see cref="TWTY.HANDLE"/>.
/// </summary> /// </summary>