C / C++ / MFC Discussion Boards

Re: error LNK2019 occurred in vs2008 from compiling source of "3D Graph ActiveX Control"

David Crow1-May-09 5:23

David Crow

1-May-09 5:23

Are you linking with the correct library? Have you seen this and this and this?

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: error LNK2019 occurred in vs2008 from compiling source of "3D Graph ActiveX Control"

A&Ms1-May-09 6:01

A&Ms

1-May-09 6:01

Thanks David The Solutions was totally nice especially the last one.
I have corrected the problem by adding the lines below (using your solutions):

#ifdef _DEBUG
	# pragma comment(lib, "comsuppwd.lib")
#else
	# pragma comment(lib, "comsuppw.lib")
#endif
# pragma comment(lib, "wbemuuid.lib")

By the way, now the program works fine for making ActiveX Control , Do you have any idea How to
change it to use in my program directly.

Real-coded genetic algorithm crossover

jocasa1-May-09 0:54

jocasa

1-May-09 0:54

Hi, does anyone know how to make the crossover in a real-coded genetic algorithm? If so, can you explain this to me, thanks!

Re: Real-coded genetic algorithm crossover

Rajesh R Subramanian1-May-09 1:13

Rajesh R Subramanian

1-May-09 1:13

Hello,

There is a Genetic Algorithm Library[^] at CP that you may want to take a look at.

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Real-coded genetic algorithm crossover

jocasa1-May-09 1:59

jocasa

1-May-09 1:59

Thanks for the reply. What I've seen in the library tutorial about crossing real-coded chromosomes is that one makes the mean value between the values of the geans, is this so?

Re: Real-coded genetic algorithm crossover

Rajesh R Subramanian1-May-09 23:18

Rajesh R Subramanian

1-May-09 23:18

Well, I am not a genetic algorithm expert, neither do I feel like reading through that article.

But, you may very well start a new thread at discusion board at the bottom of the said article, which will have a higher chance of being replied to.

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Real-coded genetic algorithm crossover

jocasa2-May-09 0:39

jocasa

2-May-09 0:39

Thanks for the tip. I didn't know where to post the message, so I decided this c++ message board would be an option, but as you say it's better to post it in the other. See you!

Generating/exporting a PDF from my MFC application, for reports that are created by overloading OnDraw in a view

Sternocera1-May-09 0:08

Sternocera

1-May-09 0:08

Hello,

I'd like to be able to directly support exporting various reports from my MFC application. The reports are drawn to a device context using standard GDI techniques, overloading OnDraw in a view.

Ideally, there'd be a library that I could just drop in that provides a hDc that I'd draw to in the usual manner. This library would be either available under a copy-centre licence (BSD/MIT/COL) or would be commercially available.

Could someone suggest a library/approach?

Regards,
Sternocera

Re: Generating/exporting a PDF from my MFC application, for reports that are created by overloading OnDraw in a view

CPallini1-May-09 0:31

CPallini

1-May-09 0:31

Please, let me google that for you [^].
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Generating/exporting a PDF from my MFC application, for reports that are created by overloading OnDraw in a view

Rajesh R Subramanian1-May-09 0:39

Rajesh R Subramanian

1-May-09 0:39

Hello!

Take a look at LibHaru[^]

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Generating/exporting a PDF from my MFC application, for reports that are created by overloading OnDraw in a view

Sternocera1-May-09 0:55

Sternocera

1-May-09 0:55

Rajesh,

I took a look at LibHaru, but I found that it cannot draw to a windows GDI device context...thus, I'd have to rewrite my reports from scratch.

What I'd really like is a drop-in replacement for my GDI device context.

I read somewhere that it is somehow possible to do this using WxWidgets' PDF support. I can't seem to find any more information though,

Regards,
Sternocera

Re: Generating/exporting a PDF from my MFC application, for reports that are created by overloading OnDraw in a view

Rajesh R Subramanian1-May-09 1:01

Rajesh R Subramanian

1-May-09 1:01

You can always create a bitmap of the stuff that's stored on your device context and then Haru can print it to a PDF. Sounds viable?

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Generating/exporting a PDF from my MFC application, for reports that are created by overloading OnDraw in a view

Sternocera1-May-09 1:03

Sternocera

1-May-09 1:03

Rajesh,

Obviously, I'd much rather preserve my reports as vector graphics.

At the moment, I'm looking at wxPdfDocument - It's designed to be used from WxWidgets, but it may be possible to use from MFC,

Regards,
Sternocera

Re: Generating/exporting a PDF from my MFC application, for reports that are created by overloading OnDraw in a view

Rajesh R Subramanian1-May-09 1:11

Rajesh R Subramanian

1-May-09 1:11

If you succeed in making it work with MFC, it must make a good article for CP. Smile | :)

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Generating/exporting a PDF from my MFC application, for reports that are created by overloading OnDraw in a view

Sternocera1-May-09 1:15

Sternocera

1-May-09 1:15

Rajesh,

Yes, indeed. I have a high level idea of how it might be possible.

http://wxcode.sourceforge.net/docs/wxpdfdoc/classwx_pdf_document.html[^]

Look at the function "bool wxPdfDocument::Image". It ought to be possible to export my GDI data to a WMF file ( see http://en.wikipedia.org/wiki/Windows_Metafile[^] ), perhaps to a temp directory, and open that using wxPdfDocument afterwards.

More research is required,

Regards,
Sternocera

Is there a way to draw standard controls to bitmap if they aren't on the screen?

Entrase30-Apr-09 23:04

Entrase

30-Apr-09 23:04

I want to implement drawing of standard listbox, treeview etc. to a layered window. I know there is a method with “fake” layered window under normal one but I need more flexible control on incorporation of standard controls to final image of a layered window.

I think there may be some hidden window with controls I need and whose drawing stuff can be redirected to some bitmap. If it's not possible with the hidden window then what about window that is out of screen (e.g. x = -2000, y = -2000)?

Re: Is there a way to draw standard controls to bitmap if they aren't on the screen?

Code-o-mat30-Apr-09 23:51

Code-o-mat

30-Apr-09 23:51

Try experimenting with WM_PRINTCLIENT[^].

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: Is there a way to draw standard controls to bitmap if they aren't on the screen?

Entrase3-May-09 3:04

Entrase

3-May-09 3:04

Thanks! It works! But there is something wrong with the alpha channel.

[img]http://smages.com/i/0c/74/0c74a1f057b9a7e17a0c27e2b4dd4766.png[/img]

I'm creating 32-bpp bitmap and asking the button do draw itself there with WM_PRINTCLIENT. What's wrong?

hdc = GetDC(hWnd);
hdcMemory = CreateCompatibleDC(hdc);

nBytesPerLine = ((szWin.cx * 32 + 31) & (~31)) >> 3;
stBmpInfoHeader.biSize = sizeof(BITMAPINFOHEADER);
stBmpInfoHeader.biWidth = szWin.cx;
stBmpInfoHeader.biHeight = szWin.cy;
stBmpInfoHeader.biPlanes = 1;
stBmpInfoHeader.biBitCount = 32;
stBmpInfoHeader.biCompression = BI_RGB;
stBmpInfoHeader.biClrUsed = 0;
stBmpInfoHeader.biSizeImage = nBytesPerLine * szWin.cy;

void* pvBits;
hbmpMem = CreateDIBSection(NULL, (PBITMAPINFO)&stBmpInfoHeader, DIB_RGB_COLORS, &pvBits, NULL, 0);
memset(pvBits, 0x88, szWin.cx * szWin.cy * 4);
if (hbmpMem)
{
	HGDIOBJ hbmpOld = SelectObject(hdcMemory, hbmpMem);
	//TextOut(hdcMemory, 10, 10, L"Text", 4);
	SendMessage(ctrl, WM_PRINTCLIENT, (WPARAM)hdcMemory, PRF_CLIENT | PRF_CHILDREN | PRF_OWNED);
	//BitBlt(hdc, 0, 0, szWin.cx, szWin.cy, hdcMemory, 0, 0, SRCCOPY);
	BLENDFUNCTION stBlend;
	stBlend.AlphaFormat = AC_SRC_ALPHA;
	stBlend.BlendFlags = 0;
	stBlend.BlendOp = AC_SRC_OVER;
	stBlend.SourceConstantAlpha = 255;
	//AlphaBlend(hdc, 0, 0, szWin.cx, szWin.cy, hdcMemory, 0, 0, szWin.cx, szWin.cy, stBlend);
	UpdateLayeredWindow(hWnd, hdc, &ptWinPos, &szWin, hdcMemory, &ptSrc, 0, &stBlend, ULW_ALPHA);
	SelectObject(hdcMemory, hbmpOld);
	DeleteObject(hbmpMem);
}
DeleteDC(hdcMemory);
DeleteDC(hdc);

Re: Is there a way to draw standard controls to bitmap if they aren't on the screen?

Code-o-mat3-May-09 3:32

Code-o-mat

3-May-09 3:32

Do you simply want to make a window that has a constant blend factor? Because if yes, then you don't need a bitmap and the fancy drawing and all the rest.
Aside of this, is your problem that the button seems to loose transparency? I supose that's simply because when the button gets drawn onto your bitmap it overwrites the alpha channel.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: Is there a way to draw standard controls to bitmap if they aren't on the screen?

Entrase4-May-09 3:30

Entrase

4-May-09 3:30

I do need per-pixel alpha for some skinning engine Smile | :)

So if control overrides alpha then I have to make one more bitmap (24 bpp) and then blit it to my 32b buffer? Or there is simpler solution?

Re: Is there a way to draw standard controls to bitmap if they aren't on the screen?

Code-o-mat4-May-09 3:33

Code-o-mat

4-May-09 3:33

How about filling the alpha channel after you rendered your controls?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Check for empty buffer

CodingLover30-Apr-09 19:49

CodingLover

30-Apr-09 19:49

Hi All,

On a TCHAR buffer I've some data. I want to check them either empty or not, the content.

I tried this.

<br />
TCHAR szMyBuffer[128];<br />
<br />
if(szMyBuffer != L"")<br />
   // Do the process<br />

But this is not work, what can I do on that?

Thanks a lot

I appreciate your help all the time...
CodingLover Smile | :)

Re: Check for empty buffer

Joe Woodbury30-Apr-09 20:15

Joe Woodbury

30-Apr-09 20:15

You are checking the address of the buffer, you need to check the contents. Try:

~~if (!szMyBuffer[0])~~

if (szMyBuffer[0])

(Sorry for the brain freeze.)

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: Check for empty buffer

CPallini1-May-09 0:00

CPallini

1-May-09 0:00

It's quite the opposite (i.e. if (szMyBuffer[0])).
Smile | :)

Re: Check for empty buffer

Rajesh R Subramanian1-May-09 0:40

Rajesh R Subramanian

1-May-09 0:40

Well, you both are right, it is a matter of "where" you handle the error. Some people go by that style, Carlo. Smile | :)

It is a crappy thing, but it's life -^ Carlo Pallini

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