lsm/ntwain
1
0
Fork 0
mirror of https://github.com/soukoku/ntwain.git synced 2025-04-05 20:59:23 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

Attempt on reading string for label/help text.

Browse Source
This commit is contained in:
Eugene Wang 2023-04-06 08:50:03 -04:00
parent 9145ea1851
commit 0bef2e8374
2 changed files with 82 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

145
src/NTwain/Data/ValueReader.cs
View File

@ -1,6 +1,7 @@
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
@ -9,7 +10,7 @@ namespace NTwain.Data
/// <summary>
/// Contains methods for reading pointers into various things.
/// </summary>
public static class ValueReader
static class ValueReader
{
/// <summary>
/// Reads pointer as UTF8 string.
@ -312,76 +313,84 @@ namespace NTwain.Data
}
}
///// <summary>
///// Read the one value of a cap as string. Only STR* and HANDLE types are supported.
///// </summary>
///// <param name="twain"></param>
///// <param name="cap"></param>
///// <param name="freeMemory"></param>
///// <returns></returns>
//public static string ReadOneValueContainerString(IMemoryManager memMgr, TW_CAPABILITY cap, bool freeMemory = true)
//{
// if (cap.hContainer == IntPtr.Zero) return null;
/// <summary>
/// Read the pointer as string. This is for cap's one value string pointer
/// that
/// </summary>
/// <param name="memMgr"></param>
/// <param name="cap"></param>
/// <param name="freeMemory"></param>
/// <returns></returns>
public static string? ReadString(this ref TW_CAPABILITY cap, IMemoryManager memMgr, bool freeMemory = true)
{
if (cap.hContainer == IntPtr.Zero) return null;
// var lockedPtr = memMgr.Lock(cap.hContainer);
var lockedPtr = memMgr.Lock(cap.hContainer);
try
{
if (cap.ConType == TWON.ONEVALUE)
{
TWTY itemType;
// Mac has a level of indirection and a different structure (ick)...
if (TwainPlatform.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);
}
switch (itemType)
{
case TWTY.STR32:
return MarshalTo<TW_STR32>(lockedPtr).ToString();
case TWTY.STR64:
return MarshalTo<TW_STR64>(lockedPtr).ToString();
case TWTY.STR128:
return MarshalTo<TW_STR128>(lockedPtr).ToString();
case TWTY.STR255:
return MarshalTo<TW_STR255>(lockedPtr).ToString();
case TWTY.HANDLE:
// TODO: how to determine the length of this thing???
// null-terminated and encoded string?
// good chance this ain't right.
using (var stream = new MemoryStream())
{
byte read = Marshal.ReadByte(lockedPtr);
while (read != 0)
{
stream.WriteByte(read);
read = Marshal.ReadByte(lockedPtr);
lockedPtr += 1;
}
// which one?
//return Encoding.Unicode.GetString(Encoding.Convert(Language.GetEncoding(), Encoding.Unicode, stream.ToArray()));
return Language.GetEncoding().GetString(stream.ToArray());
}
}
}
}
finally
{
if (lockedPtr != IntPtr.Zero) memMgr.Unlock(cap.hContainer);
if (freeMemory)
{
memMgr.Free(cap.hContainer);
cap.hContainer = IntPtr.Zero;
}
}
return null;
}
// try
// {
// if (cap.ConType == TWON.ONEVALUE)
// {
// TWTY itemType;
// // Mac has a level of indirection and a different structure (ick)...
// if (TwainPlatform.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);
// }
// switch (itemType)
// {
// case TWTY.STR32:
// return MarshalTo<TW_STR32>(lockedPtr).ToString();
// case TWTY.STR64:
// return MarshalTo<TW_STR64>(lockedPtr).ToString();
// case TWTY.STR128:
// return MarshalTo<TW_STR128>(lockedPtr).ToString();
// case TWTY.STR255:
// return MarshalTo<TW_STR255>(lockedPtr).ToString();
// case TWTY.HANDLE:
// // null-terminated and encoded string.
// // good chance this ain't right.
// using (var stream = new MemoryStream())
// {
// byte read = Marshal.ReadByte(lockedPtr);
// while (read != 0)
// {
// stream.WriteByte(read);
// read = Marshal.ReadByte(lockedPtr);
// lockedPtr += 1;
// }
// // which one?
// return Encoding.Unicode.GetString(Encoding.Convert(Language.GetEncoding(), Encoding.Unicode, stream.ToArray()));
// //return Language.GetEncoding().GetString(stream.ToArray());
// }
// }
// }
// }
// finally
// {
// if (lockedPtr != IntPtr.Zero) memMgr.Unlock(cap.hContainer);
// if (freeMemory) memMgr.Free(ref cap.hContainer);
// }
// return null;
//}
/// <summary>
/// Read the container pointer content.
/// </summary>

12
src/NTwain/TwainAppSession.Caps.cs
View File

@ -171,7 +171,7 @@ namespace NTwain
/// </summary>
/// <typeparam name="TValue"></typeparam>
/// <param name="cap"></param>
/// <param name="value"></param>
/// <param name="values"></param>
/// <returns></returns>
public STS GetCapValues<TValue>(CAP cap, out IList<TValue> values) where TValue : struct
{
@ -208,7 +208,7 @@ namespace NTwain
/// <summary>
/// Gets a CAP's help text (description).
/// This is not implemented due to unclear spec.
/// This may not work due to unclear spec.
/// </summary>
/// <param name="cap"></param>
/// <param name="help"></param>
@ -220,8 +220,7 @@ namespace NTwain
var rc = DGControl.Capability.GetHelp(ref _appIdentity, ref _currentDS, ref value);
if (rc == TWRC.SUCCESS)
{
// TODO: how to determine the length of this thing???
var data = value.ReadOneValue<IntPtr>(this, false);
help = value.ReadString(this, false);
}
value.Free(this);
return WrapInSTS(rc);
@ -229,7 +228,7 @@ namespace NTwain
/// <summary>
/// Gets a CAP's text name label.
/// This is not implemented due to unclear spec.
/// This may not work due to unclear spec.
/// </summary>
/// <param name="cap"></param>
/// <param name="label"></param>
@ -241,8 +240,7 @@ namespace NTwain
var rc = DGControl.Capability.GetLabel(ref _appIdentity, ref _currentDS, ref value);
if (rc == TWRC.SUCCESS)
{
// TODO: how to determine the length of this thing???
var data = value.ReadOneValue<IntPtr>(this, false);
label = value.ReadString(this, false);
}
value.Free(this);
return WrapInSTS(rc);