C# Visual Sudio - showing video in picturebox

limeye

Hi,

How do I show the video captured by the zwo camera on a picturebox in Visual Studio 2015 ?


                 if (ASICameraDll.GetVideoData(0, ImageBuf, size, 0))
                {
                    outputBox.Items.Add("Successful");
                    byte dataByte = null;
                    if (imageType == ASICameraDll.ASI_IMG_TYPE.ASI_IMG_RAW16)
                        size *= 2;

                    dataByte = new byte;
                    Marshal.Copy(ImageBuf, dataByte, 0, size);

                    pictureBox.Image = xxx;// what do i put here so that i am able to show the video out? 

                }

Apart from that, when I run the code, it doesn't seem to be running into this loop, is there anyone who can advise me??

Thanks

yang

I'm not clear about C# image diaplay, when I have time I'll create a C# demo. currently please refer to our c/c++ demo contained in our SDK package.

limeye

Ohh.. by any chance, do you know how to convert (by casting, or is there other methods) the camera's image into system.drawing.image? :/

yang

You can do like below to display a image array, but Format8bppIndexed seems not correct, you should modify somewhere to make image looks normal.

int bufferSize = Height * Width;

byte buffer = new Byte;

IntPtr dataPtr = Marshal.AllocHGlobal(bufferSize);

if (GetVideoData(dataPtr, bufferSize, 0))

{

Marshal.Copy(dataPtr, buffer, 0, bufferSize);

int columns = Width;

int rows = Height;

int stride = columns;

Bitmap im = new Bitmap(columns, rows, stride, PixelFormat.Format8bppIndexed, Marshal.UnsafeAddrOfPinnedArrayElement(buffer, 0));

Bitmap resized = new Bitmap(im, new Size(pictureBox.Width, pictureBox.Height));

pictureBox.Image = resized;

}

Marshal.FreeHGlobal(dataPtr);

limeye

thank you!!

now i have a little problem with the image displayed. currently the image displayed is a still picture, i need to press a button for it to reload. however, i require the picturebox to show a live stream of the camera. do you have any idea on how i can do it?

evren

Hi limeye,

To get a live stream, you need put this segment of Yang's code into a loop.

yang wrote:

if (GetVideoData(dataPtr, bufferSize, 0))

{

Marshal.Copy(dataPtr, buffer, 0, bufferSize);

int columns = Width;

int rows = Height;

int stride = columns;

Bitmap im = new Bitmap(columns, rows, stride, PixelFormat.Format8bppIndexed, Marshal.UnsafeAddrOfPinnedArrayElement(buffer, 0));

Bitmap resized = new Bitmap(im, new Size(pictureBox.Width, pictureBox.Height));

pictureBox.Image = resized;
}

So the logic is, once you have read a frame from memory and rendered it on screen you read the next frame and render it.

Best regards,

Evren

evgeny_k

yang wrote:
You can do like below to display a image array, but Format8bppIndexed seems not correct, you should modify somewhere to make image looks normal.

int bufferSize = Height * Width;

byte buffer = new Byte;

IntPtr dataPtr = Marshal.AllocHGlobal(bufferSize);

if (GetVideoData(dataPtr, bufferSize, 0))

{

Marshal.Copy(dataPtr, buffer, 0, bufferSize);

int columns = Width;

int rows = Height;

int stride = columns;

Bitmap im = new Bitmap(columns, rows, stride, PixelFormat.Format8bppIndexed, Marshal.UnsafeAddrOfPinnedArrayElement(buffer, 0));

Bitmap resized = new Bitmap(im, new Size(pictureBox.Width, pictureBox.Height));

pictureBox.Image = resized;

}

Marshal.FreeHGlobal(dataPtr);

Hello.

And what about Snapshots for VS?

How can I put a snapshot inside pictureBox?

Thanks in advance

chad

Hi，

Yang will answer you in another post.

Thanks

Chad