Get client screenshot and upload

chenx0511

How to get the screenshot of the client in the webpage and upload it in Asp.Net?

shenmue024

Write an activex control, use the windows API function bitblt to copy the screen, save it as a file, and upload it.

5954979

How can someone always do something like me.
I wrote an ActiveX in VC ++, captured the area selected by the user, compressed it into Jpeg, then converted it to Base64, and uploaded it.
Give you the key part of the code:
HBITMAP CCopyScr :: CopyToBmp (CRect Rect)
{
// Screen and memory device description table
HDC hScrDC, hMemDC;

// bitmap handle
HBITMAP hBitmap, hOldBitmap;

// selected area coordinates
int nX, nY, nX2, nY2;

// bitmap width and height
int nWidth, nHeight;

        // Screen Resolution
int xScrn, yScrn;

// make sure the selected area is not an empty rectangle
if (IsRectEmpty (&Rect))
return NULL;

// Create a device description table for the screen
hScrDC = CreateDC ("DISPLAY", NULL, NULL, NULL);
Ranch
// Create a compatible memory device description table for the screen device description table
hMemDC = CreateCompatibleDC (hScrDC);
Ranch
// get the coordinates of the selected area
nX = Rect.left;
nY = Rect.top;
nX2 = Rect.right;
nY2 = Rect.bottom;
Ranch
// Get screen resolution
xScrn = GetDeviceCaps (hScrDC, HORZRES);
yScrn = GetDeviceCaps (hScrDC, VERTRES);
Ranch
// Make sure the selected area is visible
if (nX <0)
nX = 0;
if (nY <0)
nY = 0;
if (nX2> xScrn)
nX2 = xScrn;
if (nY2> yScrn)
nY2 = yScrn;
nWidth = nX2-nX;
nHeight = nY2-nY;
Ranch
// Create a bitmap compatible with the screen device description table
hBitmap = CreateCompatibleBitmap (hScrDC, nWidth, nHeight);
Ranch
// Select the new bitmap into the memory device description table
hOldBitmap = (HBITMAP) SelectObject (hMemDC, hBitmap);
Ranch
// Copy the screen device description table to the memory device description table
BitBlt (hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, SRCCOPY);
Ranch
// Get the handle of the screen bitmap
hBitmap = (HBITMAP) SelectObject (hMemDC, hOldBitmap);
Ranch
// clear
DeleteDC (hScrDC);
DeleteDC (hMemDC);
Ranch
// return the bitmap handle
return hBitmap;
}

sunray

asp.net has no screen capture components. Can only rely on other custom .dll slightly, ha ha

chenx0511

Is there a client script to simulate the screenshot key
And then get the content?

shenmue024

Is there a client script to simulate the screenshot key
And then get the content?
=============
No.

shenmue024

If there is, there is no privacy for users.

5954979

If there is such a script, it must be a security hole.

ActiveX can achieve this, so the security of ActiveX is widely criticized.

zhouji700

If you use VS to develop, then the client should also install DotnetFramework.

chenx0511

With C ++, I don't want the user to install anything except activex itself.