[Lazarus] Fwd: using a weird DLL

[duilio foschi]

for Sven:

>Is the function declared inside an "extern "C"" block?

no

The code says:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Runtime.InteropServices;
using System.Drawing;
using System.Drawing.Imaging;


namespace SkinAnalyzer
{
    public class ImageProcessing
    {

//--------------------------------------------------------------------------------------------
        public ImageProcessing()
        {
            // init., if necessary
        }


//--------------------------------------------------------------------------------------------
        // get the features

        public bool GetSkinFeatures(Bitmap Input_Bitmap, Rectangle
ROI_Rect, double[] ExtractedFeatures)
        {
            // check the parameters
            if (Input_Bitmap == null)
                return false;
            if (Input_Bitmap.PixelFormat != PixelFormat.Format8bppIndexed &&
                    Input_Bitmap.PixelFormat != PixelFormat.Format24bppRgb
&&
                    Input_Bitmap.PixelFormat != PixelFormat.Format32bppArgb
&&
                    Input_Bitmap.PixelFormat != PixelFormat.Format32bppRgb)
                return false;

            // get the input pixels
            Rectangle rect1 = new Rectangle(0, 0, Input_Bitmap.Width,
Input_Bitmap.Height);
            BitmapData input_data = Input_Bitmap.LockBits(rect1,
ImageLockMode.ReadOnly, Input_Bitmap.PixelFormat);
            IntPtr ptr1 = input_data.Scan0;
            int bytesbpp = 0;    // bytes_per_pixel
            switch (Input_Bitmap.PixelFormat)
            {

On Mon, Feb 1, 2021 at 10:08 AM duilio foschi <octopushole at gmail.com> wrote:

> I am corrected. The DLL is written in c#. It seems that Bitmap and
> Rectangle are common predefined/usable objects in C#.
>
> Re Bitmap, I found these notes:
> "Surely you cannot expect C# Bitmap to be binary compatible with Delphi
> TBitmap? You need to pass around an HBITMAP. On the Delphi side you use
> ReleaseHandle to get the HBITMAP. On the C# side it would be
> Image.FromHbitmap"
>
> Re Rectangle, I found nothing interesting :(
>
> However it seems natural to expect that Rectangle it is given by a pointer
> to a fixed array of 2 points= 4 integers= 16 bytes in all.
>
> Thank you
> Duilio
>
> On Mon, Feb 1, 2021 at 7:52 AM Sven Barth <pascaldragon at googlemail.com>
> wrote:
>
>> duilio foschi via lazarus <lazarus at lists.lazarus-ide.org> schrieb am
>> So., 31. Jan. 2021, 23:23:
>>
>>> I would like to use a function exported from a DLL. The DLL was written
>>> in C++ (Visual Studio 2015).
>>>
>>> Inside the original code the function is declared as
>>>
>>>         public bool GetSkinFeatures(Bitmap Input_Bitmap, Rectangle
>>> ROI_Rect, double[] ExtractedFeatures)
>>>
>>> Anybody knows how to use it from Lazarus?
>>>
>>
>> Can you also show the declarations of Bitmap and Rectangle? Is the
>> function declared inside an "extern "C"" block?
>>
>> Regards,
>> Sven
>>
>>>
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