C / C++ / MFC

26-Jan-05 10:38

act_x wrote:
My IDE is complaining of the new line when i do this

The code snippet provided by rbid is what you are after.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

WM_TIMER in a UI thread

Tom Wright26-Jan-05 9:34

26-Jan-05 9:34

I'm wanting to add a OnTimer event to me UI thread class, but cannot seem to get it to work. I assume that the time only works with some kinda dialog, but my thread does not have that, only my main app does. Is there a way to add this event to my thread with out adding a dialog?

Thanks

Tom Wright
tawright915@yahoo.com

David Crow26-Jan-05 9:50

26-Jan-05 9:50

So what does not work? When you create a timer via SetTimer(), it communicates back to the application in one of two ways: the function pointer that was provided, or by posting a WM_TIMER message.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Tom Wright26-Jan-05 10:11

26-Jan-05 10:11

It's never getting to my OnTimer function.

When you say function pointer ...what do you mean?

Thanks

Tom Wright
tawright915@yahoo.com

David Crow26-Jan-05 10:15

26-Jan-05 10:15

Tom Wright wrote:
When you say function pointer ...what do you mean?

A callback function.

void CALLBACK TimerProc(...)
{
}
 
SetTimer(..., TimerProc); // TimerProc is the address of the function that gets notified

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Tom Wright26-Jan-05 10:17

26-Jan-05 10:17

Never worked with callbacks....guess it's time to learn.

Thank again David

Tom Wright
tawright915@yahoo.com

Tom Wright26-Jan-05 10:27

DirectX and OpenGL question

26-Jan-05 10:27

Let me ask you this. According to the MSDN is says that the hWnd is

Handle to the window to be associated with the timer. This window must be owned by the calling thread. If this parameter is NULL, no window is associated with the timer and the nIDEvent parameter is ignored.

My thread does not have a window associates to it. And I need for SetTimer to look at the nIDEvent parameter because I have three timers doing three different things.

Can I just pass the handle from my main app and still have the timer work in my UI thread?

Thanks

Tom Wright
tawright915@yahoo.com

Anonymous26-Jan-05 9:32

Anonymous

26-Jan-05 9:32

I havent done DX programming before but I found out that you can enter fullscreen mode by SetCooperativeLevel and pass DDSCL_FULLSCREEN as one of the params.

For OpenGL I ran accorss the following line of code: ChangeDisplaySettings(&dmScreenSettings, CDS_FULLSCREEN);

How do I determine if an app is running in the fullscreen mode? Unsure | :~

Reading checkboxes in excel spreadsheet

shultas26-Jan-05 9:18

shultas

26-Jan-05 9:18

Hey all.

I've searched for a few days and the best class that I've found where I can easily read data from a spreadsheet was one that is posted on this site named CSpreadsheet. It works great, with one exception, I cannot get it to read check boxes (and to see whether or not they are checked). In the sheet in Excel, I can see the name of the checkbox is Check Box 1 ... but I can not find any class(es) or code samples that shows me how to read them. Can anyone point me in the right direction? I would really appreciate it

TIA

Re: Converting text to float (MFC)

Tom Wright26-Jan-05 9:15

Retrieving number of directories

26-Jan-05 9:15

huh?

Why would you have to write a function for each edit box. Just read in the float and dow what you want to do to it. Else you can to what David Crow suggests which seems the easiest way.

Maybe you could give more detail in what you are doing and trying to accomplish

Tom Wright
tawright915@yahoo.com

FayezElFar26-Jan-05 8:55

26-Jan-05 8:55

I'm trying to find the number of directories (subfolders) in a certain user-defined folder.
I'm having to retrieve files from these subdirectories according to extension, and recursive algorithms traverse ALL subfolders, making my application very slow.
What I am planning on doing is retrieving the number of folders, partitioning them, and creating three or four threads to traverse each partition. This should enhance my execution time considerably.

Please help! Is there a function that will retrieve the number of directories in a folder?
Thanks

When the going gets tough... write a computer program to do it for you

David Crow26-Jan-05 9:44

26-Jan-05 9:44

FayezElFar wrote:
What I am planning on doing is retrieving the number of folders, partitioning them, and creating three or four threads to traverse each partition. This should enhance my execution time considerably.

Doubtful, since the extra time that is involved in context switching would add to the overall time. If you had a true multiprocessor machine, then the threads would truly operate independently of each other.

I tried something very similar to this a few years ago for finding files. For each file pattern that was sought, I created a thread. As each thread worked, the results were added to a listbox of some sort. While it was neat to watch, it was definitely slower than had I processed each file pattern separately.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

FayezElFar26-Jan-05 10:12

26-Jan-05 10:12

Thanks for the warning. Is there anything else you would suggest? Below you will find the heirarchy of the folders (and files) I'm trying to access. My goal is to retrieve all files of a certain extension.

USER DEFINED DIRECTORY LEVEL 1
|
------------------------------------------
| | | .................. . . . |
Dir1 Dir2 Dirx LEVEL 2
|
---------------------
| | | | | |
SD1 SD2 SD3 SD4 SD5 FILE! Level 3

SD: Subdirectory
I need the file in the third level. However, the class I'm using right now will go through all the SDs in search for it.. I cannot specify how deep the recursion goes. Plus I don't have much time to create my own class. Deadlines deadlines deadlines.

When the going gets tough... write a computer program to do the thing for you

David Crow26-Jan-05 10:18

26-Jan-05 10:18

What does the "search" method of the class look like? Perhaps it can be tweaked just a bit in hopes of shaving off a second here and there.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

FayezElFar26-Jan-05 10:29

26-Jan-05 10:29

I'm using a class I got off of codeproject, calles CSADirRead. It's an amazing class, written by a guy at Smaller Animals Inc. (props).
Please let me know of anything you can find.

When the going gets tough... write a computer program to do the thing for you

David Crow26-Jan-05 10:41

26-Jan-05 10:41

You might ask Chris Losinger if he has any performance suggestions.

In the interim, see if you can build upon this:

int FindFiles( LPCSTR lpszFolder )
{
    CString strFolder(lpszFolder);
    CFileFind find;
    BOOL bFound;
    int nCount = 0;
 
    bFound = find.FindFile(strFolder + "\\*.*");
    while (TRUE == bFound)
    {
        bFound = find.FindNextFile();
 
        if (find.IsDirectory() == TRUE)
        {
            if (! find.IsDots())
                nCount += FindFiles(find.GetFilePath());
        }
        else
        {
            // there are better ways of comparing, but this gives you an idea
            if (find.GetFileName().Right(4) == ".txt")
                nCount++;
        }
    }
 
    return nCount;
}
...
int x = FindFiles("c:\\winnt");

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

JKallen26-Jan-05 12:42

JKallen

26-Jan-05 12:42

the above works fine. Make sure you call FindNextFile before calling any of the GetFileName Path etc functions. Go to msdn.com and select Library. In the search field type "CFileFind::"

It tells you everything you need to know

FayezElFar27-Jan-05 5:01

Cannot covert parameter - __stdcall

27-Jan-05 5:01

Thanks a whole bunch bro.
Got it working. Not as fast as it needs to be, but I think I reached near-HD-speed cap. That's good enough
I appreciate it.

cheers

When the going gets tough... write a computer program to do the thing for you

User 137680026-Jan-05 8:41

User 1376800

26-Jan-05 8:41

Hi all,
I'm slowly teaching myself Visual C++, and generally doing okay. I've come across a stumbling block though.
I'm working with an SDK that requires a non-disclosure agreement, so I can't paste code fully here sorry. Here's a bit of a mockup of my problem though.

in program.h

//Implementation<br />
//...<br />
  afx_msg void __stdcall doThatThing(struct ndaStruct*, void*)<br />
//...<br />

in program.cpp

void MSWSTDCALL programApp::doThatThing(ndaStruct *foo, void *local_state)<br />
{<br />
  //Do stuff here with foo<br />
}<br />

Another bit obviously calls doThatThing - this is however done from within a function that is a part of the SDK I'm working with, so can't change anything about the way that it calls it.

When I attempt to compile, I get:

error C2664: 'NDA_function' : cannot convert parameter 6 from 'void (struct ndaStruct *,void *)' to 'void (__stdcall *)(struct ndaStruct *,void *)<br />

I'm sure I just need to change the declaration in program.h somehow, but I REALLY don't know how.
Sorry for the vagueness... I know it may make it a bit confusing.

Any help?

Re: Cannot covert parameter - __stdcall

David Crow26-Jan-05 9:48

Re: Cannot covert parameter - __stdcall

26-Jan-05 9:48

Have you tried making the doThatThing() member function static?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

User 137680026-Jan-05 10:21

User 1376800

26-Jan-05 10:21

Hah! As simple as that. Worked perfectly.
Thanks a lot Smile | :)

Re: Cannot covert parameter - __stdcall

trelliot27-Jan-05 18:23

trelliot

27-Jan-05 18:23

I'm not really sure what you're trying to do, but it may be an ambiguity between ::doThatThing() and programApp::doThatThing() so you may have to explicitly declare the parameter as either ::doThatThing() or programApp::doThatThing() depending on where it is called.

Splitter window title

mdave26-Jan-05 7:55

mdave

26-Jan-05 7:55

I have seen at least one commercial product (VisualTest) that has a horizontal splitter window with a title. That is, the top gripper bar is wider than normal, and has text in it that describes the contents of the window below. A screen shot is available at:
http://www.magicdave.com/private/browse/vt.jpg

I can sort of simulate that if the window contains a ListView by setting the ListCtrl to REPORT style and adding one column heading with the text, but that leaves you with that annoying column sizing thing in the header, which I find unaesthetic. Further, you're out of luck entirely if the window contains a TreeCtrl--and the window I'm making does.

I have tried every solutuion I can think of, including attaching a custom CHeaderCtrl, but nothing seems to work.

Any suggestions?

Re: Splitter window title

Tom Wright26-Jan-05 9:25