C / C++ / MFC

Re: Charge Images from a PATH

27-Apr-04 5:38

Hugo Bertorello wrote:
...charge an image from a PATH

What exactly does this mean? Confused | :confused:

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

PJ Arends27-Apr-04 7:00

PJ Arends

27-Apr-04 7:00

Use LoadImage with the LR_LOADFROMFILE flag

HBITMAP bmp = (HBITMAP)LoadImage(NULL, _T("C:\\MyBitmap.bmp"), IMAGE_BITMAP, 0, 0, LR_DEFAULTSIZE | LR_LOADFROMFILE);

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

System wide CBT-Hook reacts only to windows in creating process

Nick Nougat27-Apr-04 4:05

Nick Nougat

27-Apr-04 4:05

Hi!

I need to be able to control the life time of a window that was created in a different process. For that purpose I set a CBT-hook to check for the HCBT_DESTROYWND notification. The problem is that I only get notifications for destroyed windows that were created by threads in my own process.

The hook callback function is, as the docs request, in a separate dll.
I use this function call to set the hook:

::SetWindowsHookEx(WH_CBT, _CBTProc, hInstance, NULL);

Here, hInstance is the handle to the loaded separate dll and _CBTProc is the pointer to my callback inside that dll.
As I said: it works, I get notifications, but ONLY for windows owned by threads in my process. That's not what I consider a "system wide" hook!
As a workaround I also tried to get the ID of thread owning the window I want to be informed about via GetWindowThreadProcessID() and used that ID instead of the NULL parameter when setting the hook - to no avail...
In this same separate dll I use a system wide mouse hook. This mouse hook _does_ work however.

So my question is: did I miss something important concerning CBT hooks? How can I get a really system wide CBT hook installed?

Thanks in advance
Nick

CFormView in a Dialog Based Aplication

Carlos Sánchez García27-Apr-04 4:00

Carlos Sánchez García

27-Apr-04 4:00

Hello,

I want to scroll the content (among other things) and I would like to use CScrollView class that already handles all the bulk of the code.

The question is: Can a View as CFormView used without an atached Doc and a Frame?, that's it appart of Doc/View architecture.

Thanks in advanced.

There's a simple solution

Nitzan Shaked27-Apr-04 4:43

Nitzan Shaked

27-Apr-04 4:43

I believe it can't, but that doesn't mean you're stuck: simply create an "empty" document class. To add the view to that document, you can either do it manually, or even better: create a document template.

You can create the document using the class-wizard, which is a snap. The template you simply instanciate with the run-time classes of the document and the view.

-- Nitzan

Runtime Error

rrrado27-Apr-04 3:08

27-Apr-04 3:08

I've made my application in Visual C++ 6.0 using the MFC.
One of users is reporting that application is crashing with the "Runtime Error! Program: C:\.....\..exe abnormal program termination", I can't reproduce this bug on my computer.
When the runtime shows this message box ? There is no address of crashing code,
so I can't find the problem Frown | :(

What to do ?
Thanks

rrrado

David Crow27-Apr-04 3:15

27-Apr-04 3:15

Nothing definitive, but:

Does it crash often, or was it a one-time thing?

Does it crash in the same place (e.g., opening of a certain file, rendering of a particular graphic) everytime?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

rrrado27-Apr-04 3:21

27-Apr-04 3:21

It crashes every time and always at the same place.
But if I try to make the same steps which leads to crash on
my computer, everything is working correctly.
I can't visit the user with the debugger Frown | :(

rrrado

David Crow27-Apr-04 3:28

27-Apr-04 3:28

rrrado wrote:
It crashes every time and always at the same place.

Perhaps you could add some debugging code (message box, or a log file) to that particular area of the program.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

rrrado27-Apr-04 3:32

27-Apr-04 3:32

maybe I'll have to do so,
but it's probably inside quite complex function running in worker thread,
calling lot of functions, which are operating with strings, network and database Frown | :(

It would be so many messages Frown | :(

rrrado

David Crow27-Apr-04 3:44

27-Apr-04 3:44

I did not say it would be easy, unfortunately. The only thing I can offer that might expedite your time is a macro. It's bulky, but the goal is to squelch a bug, not operate at maximum efficiency, right?

#define LOG(x) {FILE *p=fopen(..., "a");fprintf(p, "%s\n", x);fclose(p);}
...
LOG("Starting abc task");

This is just an example. You might want to tweak it so that variables and such can be output, too.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

rrrado27-Apr-04 4:00

27-Apr-04 4:00

good idea to write it into file Smile | :)

thanx

rrrado

David Crow27-Apr-04 4:07

27-Apr-04 4:07

Let's just hope that the file I/O does not mask the problem.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Paul Ranson27-Apr-04 4:55

Paul Ranson

27-Apr-04 4:55

I think you get that message after someone has called 'abort'. And 'abort' can get called when an exception is thrown inside an exception handler or when a C++ exception isn't caught at all.

So if you're using exception handling it's worth reviewing it. And if you're not it's worth looking at whether any of the libraries you're using are, and trying some try/catch stuff...

Paul

rrrado27-Apr-04 5:13

27-Apr-04 5:13

Thanks for suggestion, I didn't know that unhandled exceptions are making this.
I'm not using exception handlig, it seems to be much more difficult to use than good old return value errors.
I'll try to make some TRY CATK on whole function

rrrado

toxcct27-Apr-04 5:45

toxcct

27-Apr-04 5:45

if it was an exeption, you should have the error message like this : unhandled exception 0x...... at....

TOXCCT >>> GEII power

Paul Ranson27-Apr-04 7:22

Paul Ranson

27-Apr-04 7:22

That's what you get under the debugger. In a release build running alone using VC7.1 you get a message box containing,

"Runtime error!

This program has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information"

Paul

toxcct27-Apr-04 8:09

toxcct

27-Apr-04 8:09

no, the message i described was a Windows generated messageBox...

TOXCCT >>> GEII power

how can i get RGB value from an image

Cedric Moonen27-Apr-04 20:41

Cedric Moonen

27-Apr-04 20:41

Yes but it only appears if visual studio is intalled on the computer (because it asks you if you want to debug the code).

Member 41696027-Apr-04 2:55

Member 416960

27-Apr-04 2:55

hiiiiiii

can anybody telll me how can i pick the RGB value from an image on "onMouseOver event" and how can i show them in edit boxes.

Re: how can i get RGB value from an image

rrrado27-Apr-04 3:11