Quote: reference danran251689 reply: 3/f

Quote: refer to 1st floor wanghui0380 response:

Calculate a byte [] size, 8-bit grayscale said 1 1 byte

Byte [] buffer=new byte [width * height]

Marshal. Copy (first address, buffer, 0, buffer length);//we don't know, what is the first address, I assume it is hosting the address, so using Marshal. Copy

can speak more specifically?

Specific, we don't know you specific use environment, can only assume that this is the result of calling a c + + DLL, so may be returned to you the width, height and an address

Such as return inptr p, int width, int,

8-bit grayscale image, it is a byte (eight bits) represents a pixel, so how many pixels width * height can have, namely the number of bytes,

Marshal. Copy means how many bytes of data read from the memory to the specified managed array

Explain about this thing to see the MSDN
https://docs.microsoft.com/zh-cn/dotnet/api/system.runtime.interopservices.marshal.copy? Redirectedfrom=MSDN& View=netframework 4.8 # overloads

 byte [and] Data;//save the pixel matrix 
Int width_=0; 
Int heigth_=0; 
Int chnum_=0; 
Long buff_=0; 
Int tool=axCKVisionCtrl1. GetTool (" gathering image "); 
Buff_=axCKVisionCtrl1. GetImageBuffer (tool, ref width_, ref heigth_, ref chnum_); 
Bitmap BMP=new Bitmap (width_, heigth_); 
//Lock the bitmap 's bits. 
BitmapData bmpData=https://bbs.csdn.net/topics/bmp.LockBits (new Rectangle (0, 0, BMP. Width, BMP, Height), ImageLockMode. ReadOnly, PixelFormat. Format24bppRgb); 
This. Width=bmpData. Width; 
This. Height=bmpData. Height; 
Data=https://bbs.csdn.net/topics/new byte (Height, Width), 
The unsafe 
{
Byte * PTR=(byte *) buff_; 
for (int i=0; i {
For (int j=0; j {
//convert the 24-bit RGB color chart to grayscale 
Int temp=(int) (0.114 * (* ptr++)) + (int) (0.587 * (* ptr++)) + (int) (0.299 * (* ptr++)); 
Data [I, j)=temp (byte); 
} 
PTR +=bmpData. Stride - Width * 3;//pointer and fill the blank space 
} 
} 
BMP. UnlockBits (bmpData); 
PictureBox1. Image=BMP;