ImageLayout Problems… again…

[si_ben]

Okay so while in State 4 :

I negotiate ICap_Units successfully to Inches.

After that I call this

// Attempt to Manually Set Image Size if TW_SS Unsupported

switch (m_ImageLayout)

{

case "LET":

// In Pixels (2550, 3300)

TwImageLayout iil = new TwImageLayout();

iil.Frame = new TwFrame();

iil.FrameNumber = 1;

iil.PageNumber = 1;

iil.DocumentNumber = 1;



// Get Current Image Info

rc = DSilayout(appid, srcds, TwDG.Image, TwDAT.ImageLayout, TwMSG.Get, iil);

if (rc != TwRC.Success)

{

CloseSrc();

}

break;

case "LEG":

// In Pixels (2550, 4200)

break;

case "LED":

break;

}

AccessViolationException Unhandled:
I get an ‘Attempted to read or write protected memory. This is often an indication that other memory is corrupt.’

Here are my Definitions :

[StructLayout(LayoutKind.Sequential, Pack = 2)]

internal struct TwImageLayout

{

public TwFrame Frame;

public Int32 DocumentNumber;

public Int32 PageNumber;

public Int32 FrameNumber;

}



[StructLayout(LayoutKind.Sequential, Pack = 2)]

internal struct TwFrame

{

public Int32 Left;        // TW_FRAME

public Int32 Top;

public Int32 Right;

public Int32 Bottom;

}



[DllImport("twain_32.dll", EntryPoint = "#1")]

private static extern TwRC DSilayout([In, Out] TwIdentity origin, [In] TwIdentity dest, TwDG dg, TwDAT dat, TwMSG msg, [In, Out] TwImageLayout layout);

Does anybody know what I’m doing wrong?

[si_ben]

Still haven’t figured it out.

I use both (Twacker, Twirl) to debug my settings. And I’m in State(4) when I do the request operation. I kind of have a feeling it might have something to do with Allocating Memory space for the structure, but I don’t have to do that for the ImageInfo structure.

Have I declared my Structures improperly?

I think it’s probably more in the DSilayout declaration but I cannot find an example of how to declare the entry point.

[si_ben]

OOOOOOOOOOKAY…. Finally…

Here is the code….

Had :

[StructLayout(LayoutKind.Sequential, Pack = 2)]

internal struct TwImageLayout

{

public TwFrame Frame;

public Int32 DocumentNumber;

public Int32 PageNumber;

public Int32 FrameNumber;

}



[StructLayout(LayoutKind.Sequential, Pack = 2)]

internal struct TwFrame

{

public Int32 Left;        // TW_FRAME

public Int32 Top;

public Int32 Right;

public Int32 Bottom;

}

Needed :

[StructLayout(LayoutKind.Sequential, Pack = 2)]

internal class TwImageLayout

{

public TwFrame Frame;

public ulong DocumentNumber;

public ulong PageNumber;

public ulong FrameNumber;

}



[StructLayout(LayoutKind.Sequential, Pack = 2)]

internal class TwFrame

{

public TwFix32 Left;        // TW_FRAME

public TwFix32 Top;

public TwFix32 Right;

public TwFix32 Bottom;

}

Now I need to try and figure out this (Frac) and (Whole) stuff

[si_ben]

All you have to do is use the Method of the TwFix32 Class

Def:

[StructLayout(LayoutKind.Sequential, Pack = 2)]

internal class TwFix32

{												// TW_FIX32

public short Whole;

public ushort Frac;



public float ToFloat()

{

return (float)Whole + ((float)Frac / 65536.0f);

}

public void FromFloat(float f)

{

int i = (int)((f * 65536.0f) + 0.5f);

Whole = (short)(i >> 16);

Frac = (ushort)(i & 0x0000ffff);

}

}

Example:

iil = new TwImageLayout();

iil.Frame = new TwFrame();



// Get Current Image Info

rc = DSilayout(appid, srcds, TwDG.Image, TwDAT.ImageLayout, TwMSG.Get, iil);

if (rc != TwRC.Success)

{

//CloseSrc();

}



_right = iil.Frame.Right;

_bottom = iil.Frame.Bottom;



_right.FromFloat(8.5F);

_bottom.Frac = 0;

_bottom.Whole = 14;



iil.Frame.Right = _right;

iil.Frame.Bottom = _bottom;

Thank you, Thank you… I know I know…

[Author]

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