Reply to: VS C++ Express Registration

[doodab]

All these wizardy things are great until it all goes tits up & then you have to know the stuff the wizard is based on.

Now that's magic.

[NickFitz]

It's not just me.

A lot of these modern framework implementations make things quite bulky, when they could be elegant.

Ponders. Another plan B?

The Law of Leaky Abstractions

[d000hg]

There are already zillions of wrappers around frameworks. It arguably makes the framework easier, but then is one more library for a developer to learn, and means two developers may know different wrappers for the same framework.

[suityou01]

From here:

http://www.c-sharpcorner.com/UploadF...enCapture.aspx

// Create a bitmap from the Windows handle
Bitmap image = new Bitmap(Image.FromHbitmap(new IntPtr(hBitmap)),
Image.FromHbitmap(new IntPtr(hBitmap)).Width,
Image.FromHbitmap(new IntPtr(hBitmap)).Height);

This rings a very faint bell back from when I did C# last year. You had to set the width and height otherwise it didn't work, although on the face of it the above code is somewhat insane.

It's not just me.

A lot of these modern framework implementations make things quite bulky, when they could be elegant.

Ponders. Another plan B?

[VectraMan]

From here:

http://www.c-sharpcorner.com/UploadF...enCapture.aspx

// Create a bitmap from the Windows handle
Bitmap image = new Bitmap(Image.FromHbitmap(new IntPtr(hBitmap)),
Image.FromHbitmap(new IntPtr(hBitmap)).Width,
Image.FromHbitmap(new IntPtr(hBitmap)).Height);

This rings a very faint bell back from when I did C# last year. You had to set the width and height otherwise it didn't work, although on the face of it the above code is somewhat insane.

[d000hg]

SuitYou, can I recommend StackOverflow to you? Worth a try for this kind of thing.

[suityou01]

You haven't even said what doesn't work, so it's unlikely anybody will be able to help. Does it fail to compile? Does it compile but throw a runtime exception? Does it compile and run without crashing but not do what you expect it to?

VS has a very good debugger, and it's only a few lines to step through to identify the precise point of failure, at which point looking at the MSDN docs for the relevant API call will probably point you in the right direction. Search on Raymond's blog for the relevant function's name as well, as he often mentions various gotchas and he's written loads about GDI in the past.

Doesn't work as in run the code and it fails to load the screen shot into the picture box.

I have fixed it. And am posting the code back here like a good little boy.

public Bitmap CaptureScreenToPictureBox(int hDcPbx)
        {
            int hdcSrc = User32.GetWindowDC(User32.GetDesktopWindow()),
            hdcDest = GDI32.CreateCompatibleDC(hdcSrc),
            hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc,200, 200); 
            GDI32.SelectObject(hdcDest, hBitmap);
            GDI32.StretchBlt(hdcDest, 0, 0,200,200, hdcSrc, 0, 0,1200,800, 0x00CC0020);
            Bitmap screenShot = Image.FromHbitmap((IntPtr)hBitmap);
            return screenShot;
        }

This is changed to return a System.Drawing.Bitmap object

Then the call is changed thusly

Example f = new Example();
this.pictureBox1.Image = f.CaptureScreenToPictureBox(this.pictureBox1.CreateGraphics().GetHdc().ToInt32());

[NickFitz]

Incidentally this is the second forum that cannot point me in the right direction with this code.

You haven't even said what doesn't work, so it's unlikely anybody will be able to help. Does it fail to compile? Does it compile but throw a runtime exception? Does it compile and run without crashing but not do what you expect it to?

VS has a very good debugger, and it's only a few lines to step through to identify the precise point of failure, at which point looking at the MSDN docs for the relevant API call will probably point you in the right direction. Search on Raymond's blog for the relevant function's name as well, as he often mentions various gotchas and he's written loads about GDI in the past.

[NickFitz]

Incidentally this is the second forum that cannot point me in the right direction with this code.

[apart from VectraMan]
edit : [and NF]

HTH

I don't really know the Win32 API - just bits that I've picked up from Raymond Chen's blog and book, he being the person who knows more about it than anyone else in the world

[suityou01]

Incidentally this is the second forum that cannot point me in the right direction with this code.

[apart from VectraMan]
edit : [and NF]

HTH

[suityou01]

No it isn't, but you are.

HTH

sasguru

Feck it. This is too much hassle.

I remember the days when you could just get on and code without all this framework blx.

Keepin it native

[AtW]

Although this is not the root cause of the problem though.

No it isn't, but you are.

HTH

sasguru

[suityou01]

You've spelt "Picture" wrong in your method name, although you've also spelt it wrong in the method invocation. One of the pitfalls of IntelliSense

I noticed. Although this is not the root cause of the problem though.

You're not a consultant by any chance are you

[NickFitz]

Worked like a charm. Which is more than I can say for my code.

 public void CaptureScreenToPitureBox(int hDcPbx) //NB this is part of a class called Example
        {
            int hdcSrc = User32.GetWindowDC(User32.GetDesktopWindow()),
            hdcDest = GDI32.CreateCompatibleDC(hdcSrc),
            hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc,
            GDI32.GetDeviceCaps(hdcSrc, 8), GDI32.GetDeviceCaps(hdcSrc, 10)); GDI32.SelectObject(hdcDest, hBitmap);
            GDI32.BitBlt(hdcDest, 0, 0, GDI32.GetDeviceCaps(hdcSrc, 8),
            GDI32.GetDeviceCaps(hdcSrc, 10), hdcSrc, 0, 0, 0x00CC0020);
            GDI32.StretchBlt(hDcPbx, 0, 0, 100, 100, hdcSrc, 0, 0, 1200, 800, GDI32.SRCCOPY);
        }

which is called thus

Example e = new Example();
Graphics pbG = this.pictureBox1.CreateGraphics();
e.CaptureScreenToPitureBox(pbG.GetHdc().ToInt32());

You've spelt "Picture" wrong in your method name, although you've also spelt it wrong in the method invocation. One of the pitfalls of IntelliSense

[suityou01]

"You can obtain a new valid registration key by revisiting online registration. Just click the registration link in the “Register Product…” dialog and follow the instructions. You will be provided a new registration key." - MS VSE Registration FAQ.

The "Register Product..." dialog is accessed from the Help menu.

I haven't registered a copy in a while, but IIRC you cut & paste the key from the registration web site into VSE. For some reason they don't send it to you by email.

EDIT: oh, and I thought they allowed you to use it for thirty days before registering, although I suppose they may have changed that.

Worked like a charm. Which is more than I can say for my code.

 public void CaptureScreenToPitureBox(int hDcPbx) //NB this is part of a class called Example
        {
            int hdcSrc = User32.GetWindowDC(User32.GetDesktopWindow()),
            hdcDest = GDI32.CreateCompatibleDC(hdcSrc),
            hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc,
            GDI32.GetDeviceCaps(hdcSrc, 8), GDI32.GetDeviceCaps(hdcSrc, 10)); GDI32.SelectObject(hdcDest, hBitmap);
            GDI32.BitBlt(hdcDest, 0, 0, GDI32.GetDeviceCaps(hdcSrc, 8),
            GDI32.GetDeviceCaps(hdcSrc, 10), hdcSrc, 0, 0, 0x00CC0020);
            GDI32.StretchBlt(hDcPbx, 0, 0, 100, 100, hdcSrc, 0, 0, 1200, 800, GDI32.SRCCOPY);
        }

which is called thus

Example e = new Example();
Graphics pbG = this.pictureBox1.CreateGraphics();
e.CaptureScreenToPitureBox(pbG.GetHdc().ToInt32());