Image Display - C / C++ / MFC Discussion Boards

Michael P Butler19-Jun-02 1:15

19-Jun-02 1:15

yeeeooowww wrote:
I desperately need a grid control that I need to use to dsplay data
http://www.codeproject.com/library/gridprojects.asp

Michael Smile | :)

"Eureka" is Greek for "This bath is too hot"

On dialog box move....

newneo18-Jun-02 2:02

newneo

18-Jun-02 2:02

Hello Friends

Hi ! there,,,need some help,,i hope someone will comeforward,,,
This is stupid question i know but still i want to know where i am wrong.

I have a SDI application with map displaying on that having some symbols,,,and a dialog box where uneditable related information is displayed,,,

Whenever i move the Dialog box in the Background the Map is getting effected i.e i have few symbols which are disappearing randomly,,,

I tried to fix the bug ,initially by WM_MOVE method for that dialog.,,but the problem is that it is not at all displaying any changes,,i tried first for a mere message box,,but stil it is not working,

Can any one ple solve this,,

Thanks in advance

Bye

Thanks & Regards
Neonave

Re: On dialog box move....

perlmunger19-Jun-02 9:59

perlmunger

19-Jun-02 9:59

Your English is a little broken so it's a bit difficult to understand your problem. If it's a drawing problem that you're having, take a look a the OnDraw method. If you want to make your window update the drawing region after a dialog (or any other window for that matter) obstructs it, OnDraw is where you should place the drawing code. If you are doing some drawing outside of the OnDraw method, that is OK, you just have to ensure that OnDraw knows the last state of the drawing area.

I'm not sure I'm on the right track here, so let me know if this sounds helpful. The "symbols" you speak of may be disappearing because you're not re-drawing them. Not sure what's going on exactly, though. Can you clarify?

-Matt

------------------------------------------

The 3 great virtues of a programmer:
Laziness, Impatience, and Hubris.
--Larry Wall

Handling dynamically added toolbar button events...

Mohit Khanna18-Jun-02 1:49

Mohit Khanna

18-Jun-02 1:49

Hi All,

The prob is as under:

I have a main app... lets name it "MainApp"... and a DLL named "PlugIn1"..

When I clck on one of the menu optins in the main app's window, DLL's InitPlugIn Function is called, where a new toolbar button is created... that is , a new button is appened, to the default toolbar of the main app...

I have mentioned the button state as TBSTATE_ENABLED, but still it is not enabled.... It appears as disabled...

I am using doc/view arch...

and VS7

also, one more prob, where to handle it's event... whether in the DLL or main app???

I have tried handling it in main app's Mainframe --->> OnCommand () handler... but no event is generated, when i click on this button... may be because it is disabled....

So my main prob is how to enable that button...
Please do help me... it's kinda urgent...

Thanks in advance,
Mohit Khanna Confused | :confused:

Re: Handling dynamically added toolbar button events...

dazinith18-Jun-02 4:02

dazinith

18-Jun-02 4:02

toolbar buttons will normally appear dimmed out if they do not have a message handler associated with them, so it sounds like the real problem is where to handle it, as once the event is handled the button should not be dimmed out.

make sure that you have the right ID for the button that is created, since the button is added to a toolbar that is a member of CMainFrame i would assume that the command should be in the CMainFrame's message map..

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
ON_COMMAND(ID_OPTIONS, OnOptions)
END_MESSAGE_MAP()

wish i could help more.. but im a newbie..

-dz

Re: Handling dynamically added toolbar button events...

Mohit Khanna18-Jun-02 4:09

Mohit Khanna

18-Jun-02 4:09

Hi Dazinith,

Actually in your way you are right... Messages for the toolbar can be handled in CMainFrame class... but the actual prob is that... One or more buttons are added to the toolbar dynamically by the DLL... so the CMainframe class does not know before-hand about the buttons... also the resource ID for the button may be DLL dependent... so the ideal place to handle that button's functionality is in the DLL itself...

It may be that DLL be written by a third party who does not know about CMainFrame's code... so in that way..

the application can be very flexible... so how to do that???

till know the status is.. button is being displayed... on the toolbar...
but is disabled....
how to specify the message handler... i have tried it but it still isn't being enabled...
IS it regarding to the resources???

Please someone help me on this... it's really bugging me ...

Thanks in advance...
Mohit Confused | :confused:

How to set IP address on Windows NT/2000?

18-Jun-02 1:17

How do I set/change an IP address on Windows NT/2000 using the Windows API by C/C++ code?

Image Display

sikanderrafiq18-Jun-02 0:56

sikanderrafiq

18-Jun-02 0:56

How can i display .bmp file on 300 DPI rather than 72dpi ( as window by
default shows images on 72dpi). OMG | :OMG:

Sikander

Re: Image Display

Christian Graus18-Jun-02 1:14

Christian Graus

18-Jun-02 1:14

What the hell are you talking about ? The d in dpi is dots, i.e. the number of pixels in your image. If you want it smaller on the screen, use StretchBlt.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Half the reason people switch away from VB is to find out what actually goes on.. and then like me they find out that they weren't quite as good as they thought - they've been nannied. - Alex, 13 June 2002

Re: Image Display

Tommy Svensson24-Jun-02 6:24

Tommy Svensson

24-Jun-02 6:24

Christian Graus wrote:
What the hell are you talking about ?

Please, don't be rude when answering posts! What purpose does it serve other than that people get scared and intimidated...?

Be well,

/T

Re: Image Display

C^hris L^osinger18-Jun-02 1:46

C^hris L^osinger

18-Jun-02 1:46

you can use SetWindowExt/SetViewportExt to change the effective DPI of the display.

// draw at 300-dpi
pDC->SetMapMode(MM_ISOTROPIC); 
pDC->SetWindowExt(CSize(300,300)); 
pDC->SetViewportExt(pDC->GetDeviceCaps(LOGPIXELSX), pDC->GetDeviceCaps(LOGPIXELSY));
..
..
// draw at 72-dpi
pDC->SetMapMode(MM_ISOTROPIC); 
pDC->SetWindowExt(CSize(72,72)); 
pDC->SetViewportExt(pDC->GetDeviceCaps(LOGPIXELSX), pDC->GetDeviceCaps(LOGPIXELSY));

as long as you set the Window Extent to your image's DPI, the image will be drawn at the correct size.

-c

Cheap oil. It's worth it!

Image Processing - just like mom used to make.

Re: Image Display

Christian Graus18-Jun-02 1:59

Christian Graus

18-Jun-02 1:59

Say wha ? How can that have any meaning at all ?

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Half the reason people switch away from VB is to find out what actually goes on.. and then like me they find out that they weren't quite as good as they thought - they've been nannied. - Alex, 13 June 2002

Re: Image Display

C^hris L^osinger18-Jun-02 2:12

C^hris L^osinger

18-Jun-02 2:12

Christian Graus wrote:
How can that have any meaning at all ?

because each word itself has an individual meaning which is shared by speakers of the language; and together the words' meanings, joined by way of the syntax and grammar rules also shared by speakers of the language, coalesce into a thought. this is how people communicate.

-c

Cheap oil. It's worth it!

Image Processing - just like mom used to make.

Re: Image Display

James R. Twine18-Jun-02 3:12

James R. Twine

18-Jun-02 3:12

Yep... Saw that one coming...! Laugh | :laugh:

Peace!

-=- James.
"Some People Know How To Drive, Others Just Know How To Operate A Car."
[Get Check Favorites 1.4 Now!]

Re: Image Display

C^hris L^osinger18-Jun-02 3:14

C^hris L^osinger

18-Jun-02 3:14

yeah, i know. i'm a snippy bastard. but i mean well ! Smile | :)

-c

Cheap oil. It's worth it!

Image Processing - just like mom used to make.

Re: Image Display

sikanderrafiq18-Jun-02 19:37

sikanderrafiq

18-Jun-02 19:37

Thanks Chris.. Your answer has solved my problem very well.
sikander Laugh | :laugh:

Sikander

Can't delete registry key

Hans Ruck17-Jun-02 23:41

Hans Ruck

17-Jun-02 23:41

I try to delete the key HKEY_LOCAL_MACHINE\SOFTWARE\\mykey and the system fails showing the message: "Cannot delete \mykey. Error while deleting key.".
How could i delete it?

rechi

Re: Can't delete registry key

Stefan Pedersen17-Jun-02 23:59

Stefan Pedersen

17-Jun-02 23:59

Does it contain subkeys?
If so, use SHDeleteKey() instead.

Re: Can't delete registry key

Hans Ruck18-Jun-02 0:01

Hans Ruck

18-Jun-02 0:01

The problem is that i can't delete it using Registry Editor. I don't have access to the key.

rechi

Re: Can't delete registry key

Navin18-Jun-02 2:21

Navin

18-Jun-02 2:21

I've had this problem before. I get around it by doing the following:
Green Alien | [Alien]

Log on as administrator.
Green Alien | [Alien]

Run regedt32. Note, it is imporant to use regedt32 and *NOT* regedit!
Green Alien | [Alien]

Go to the offending key, and go to the Security | Permissions dialog.
Green Alien | [Alien]

You should then be able to change the permissions of the key so that it can be removed.

You can do this programmatically too in much the same way, although the Windows security API is a bear.

No generalization is 100% true.
Not even this one.

Re: Can't delete registry key

Thomas Freudenberg18-Jun-02 3:03

Thomas Freudenberg

18-Jun-02 3:03

Maybe the double backslash is the problem here Confused | :confused:

Regards
Thomas

Sonork id: 100.10453 Thömmi

Disclaimer:
Because of heavy processing requirements, we are currently using some of your unused brain capacity for backup processing. Please ignore any hallucinations, voices or unusual dreams you may experience. Please avoid concentration-intensive tasks until further notice. Thank you.

ofstream::put() writes 2 bytes instead of 1?!

Sprudling17-Jun-02 23:38

Sprudling

17-Jun-02 23:38

I'm trying to create a function which just creates a file and fills it with random bytes. I want to be able to specify the size. I do this like this...

bool CreateRandomFile(const char* pszDest, unsigned int nLen)
{
	if (!nLen) return false;
	static const nByteSize = sizeof(byte) * 256;
	ofstream fDest(pszDest);
	if (!fDest) return false;	
	for (int i = 0; i < nLen; i++)
		fDest.put(byte(::rand() % nByteSize));
	fDest.close();
	return true;
}

This doesn't work because when (::rand() % nByteSize) becomes 10, 2 bytes are written instead of just the one. The 2 bytes are the standard "\r\n" thing and I guess it's supposed to be this way. But what should I do to get it to work properly?

byte is typedef'ed like this:

typedef unsigned char byte;

And btw.: fDest.put(10) writes 2 bytes too, and fDest.put(9) writes 1. I'm using the header "fstream" and namespace std.

Sprudling Confused | :confused:

Re: ofstream::put() writes 2 bytes instead of 1?!

Joaquín M López Muñoz17-Jun-02 23:50

Joaquín M López Muñoz

17-Jun-02 23:50

Open the file in binary mode.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

commandline of other processes

mloibl17-Jun-02 23:31

mloibl

17-Jun-02 23:31

does anyone know how to get the commandline of other processes (calling parameters)

Re: commandline of other processes

perlmunger19-Jun-02 10:10

perlmunger

19-Jun-02 10:10

Not sure why you would want to do this (there may be an easier way to accomplish what you're trying to do), but it would be pretty complex. Seems to me that you would have to write a hook that hooks into the application you're wondering about. Then have the hook respond to a particular event. At that point, your hook could possibly grab the __targv[n] (where n is the count of the parameter your interested in). __targv is a global variable that is accessible *only* from non-console apps. In other words, if it's not a GUI/MFC app, it's not going to work this way.

Other than that, you're on your own. Why don't you mention what you are trying to accomplish at a high level? This might make it easier to provide a reasonable solution.

-Matt

------------------------------------------

The 3 great virtues of a programmer:
Laziness, Impatience, and Hubris.
--Larry Wall

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.