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)
{
AM duilio foschi wrote 41 lines
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
wrote:
> duilio foschi via lazarus 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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