C / C++ / MFC Discussion Boards

Brian Shifrin3-Sep-03 7:18

3-Sep-03 7:18

You are mixing CWnd::GetMenu/CWindow::GetMenu and ::GetMenu

Win API: HMENU GetMenu( HWND hWnd );

From your mainframe class try calling GetMenu()...

Brian

Re: Disable Menu Items

Jay Hova3-Sep-03 7:42

Jay Hova

3-Sep-03 7:42

I am calling this from my main class...

I don't get it. I have almost the same exact code right beneath it and it works. (this is the code that checks the menu options)

Thanks for helping

ListBox in MFC

cberam3-Sep-03 2:17

cberam

3-Sep-03 2:17

Hi,

I have a dynamically created ListBox in my MFC app.
After selecting a Item and Pressing Enter key, In the PreTranslateMessage() routine i try to get the GetCurSel()

But the index returned is -1.Pls help in this regard.

Thnks in advance
Ram

Re: ListBox in MFC

valikac3-Sep-03 6:10

valikac

3-Sep-03 6:10

One possible reason is that windows calls PreTranslateMessage() before updating the control.

Kuphryn

video codec

Pawel Olszewski3-Sep-03 2:16

Pawel Olszewski

3-Sep-03 2:16

Hi everyone!

I'm searching for source code of the video codec (h.263 compatible).
...actually i found one OpenMash project, but i don't know how to use their codec in VC++ application Frown | :(

If anybody know some sources & examples of video compression/decompression
source etc. please give me know

Pawel Olszewski (pandora_@wp.pl)

multile doModal calls from one InitInstance() fails

ohadp3-Sep-03 1:35

ohadp

3-Sep-03 1:35

I have a program that needs to open and close and open and close several modal dialgos one after the other.

My first modal dialog goes great, but when I call the second one's doModal, it immediately closes.

I bet this is somehow related to a WM_QUIT remaining in the message-queue or something like that, but I can't really put my finger on it.

Can someone help ?

Thanks

Re: multile doModal calls from one InitInstance() fails

ohadp3-Sep-03 1:49

ohadp

3-Sep-03 1:49

Some more investigation brough up this solution:

After the first (and any other doModal()), do:

while (PumpMessage()) {};
AfxGetThreadState()->m_nDisablePumpCount--;

this will eat all messages up to and including the WM_QUIT (which increases m_nDisablePumpCount), we then ammend this counter and continue. (This counter is what causes the abrupt closure of any window to attempt and open.

Is there a cleaner solution (except for overriding PumpMessage and handling things different from inside there) ?

Re: multile doModal calls from one InitInstance() fails

David Crow3-Sep-03 2:44

David Crow

3-Sep-03 2:44

Read MSDN article Q138681.

Storing Data as ASCII format

Shaffiq3-Sep-03 1:33

Shaffiq

3-Sep-03 1:33

Hi All,

I Need Help Regarding The Storing of Data in ASCII format
How To store TEXT Data in ASCII Format and In which Format
Ascii Data to be Stored
and What are The Precautions to Be Taken Storing The Data
In ASCII Format.

Thanks In Advance

Dumbest Question Ever?

dog_spawn3-Sep-03 1:50

dog_spawn

3-Sep-03 1:50

Nice Use Of Caps!

http://www.cplusplus.com/doc/papers/ascii.html[^]

Re: Storing Data as ASCII format

Ravi Bhavnani3-Sep-03 5:42

Ravi Bhavnani

3-Sep-03 5:42

One down side to storing data in plain ASCII is that it's readable using a simple text editor like Notepad.

Another limitation is that you're limited to the ASCII set of characters, which means if you want to store binary data, you'll need to convert it to ASCII (which causes a 2x increase in size) before storing it.

If you're looking for a general article on serializing data, you might find this set[^] of articles helpful.

/ravi

Let's put "civil" back in "civilization"
Home | Articles | Freeware | Music
ravib@ravib.com

Re: Storing Data as ASCII format

Navin3-Sep-03 8:01

Navin

3-Sep-03 8:01

Check out CStdioFile, it will do what you want.

Also you can use regular C++ iostreams (e.g., ifstream and ofstream) to be more "standard" or if you aren't using MFC. MSDN has docs for all of these.

"When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute and it's longer than any hour. That's relativity." - Albert Einstein

removing duplicates via the stl

RChin3-Sep-03 1:31

RChin

3-Sep-03 1:31

Does anyone know if there is a STL algo to remove duplicate items in a vector?
I have a vector of string values that I would like to make unique. The vector will eventually be sorted. Is there a quick stl way of doing this?

On a similar not, I tried using std::set to filter duplicate strings, but I found this to be extremely slow.

I Dream of Absolute Zero

Re: removing duplicates via the stl

dog_spawn3-Sep-03 1:54

dog_spawn

3-Sep-03 1:54

There is no faster way of doing this because if you think about it you have to check the string does not exist yet. Set is pretty much the fastest way of doing that unless you want to use a hash table. Yes, there is a hash table in some versions of the stl.

If you say the vector will then be sorted, you were right to use set in the first place.

Re: removing duplicates via the stl

RChin3-Sep-03 1:57

RChin

3-Sep-03 1:57

cheers for that, dude.

I Dream of Absolute Zero

Re: removing duplicates via the stl

Andrew Walker3-Sep-03 2:07

Andrew Walker

3-Sep-03 2:07

Is this the type of thing you want? Especially if sorting may be required

sort(source.begin(),source.end());
unique_copy(source.begin(),source.end(),back_inserter(dest));

If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts you aim;
Yours is the Earth and everything that's in it.

Rudyard Kipling

Re: removing duplicates via the stl

David Crow3-Sep-03 2:46

David Crow

3-Sep-03 2:46

Can't you check for duplicates as the items are added?

Re: removing duplicates via the stl

RChin3-Sep-03 2:51

RChin

3-Sep-03 2:51

DavidCrow wrote:
Can't you check for duplicates as the items are added?

Thats why I was using the std::set as it only allows unique entries, but it was very slow on the insertions.
Having read the above replies, I may not have a choice on the performance and may have to stick with a set instead of buffering in a vector and then removing dups.

I Dream of Absolute Zero

Re: removing duplicates via the stl

dog_spawn3-Sep-03 8:10

dog_spawn

3-Sep-03 8:10

That is what set does, except it does it in an efficient way.

Re: removing duplicates via the stl

ZoogieZork3-Sep-03 12:42

ZoogieZork

3-Sep-03 12:42

RChin wrote:
On a similar not, I tried using std::set to filter duplicate strings, but I found this to be extremely slow.

You may find that using std::hash_set instead of std::set will be faster for storing strings, provided you have a good hash function.

- Mike

Re: removing duplicates via the stl

RChin3-Sep-03 22:33

RChin

3-Sep-03 22:33

Thanks for the tip Michael Smile | :)

I Dream of Absolute Zero

writing an ostream& operator<<( - function

petter_e3-Sep-03 1:24

petter_e

3-Sep-03 1:24

Hi.

Have a simple class for which I want to define a << operator
to put some ints on an ostream. Something like this worked
FINE yesterday, before I just renamed my simple class:

<br />
ostream& operator<<(ostream& os, const TimMinSek& t) {<br />
    return os << t.tms[TIM] << ':' << t.tms[MIN] << ':' << t.tms[SEK];<br />
}<br />

The t.tms-stuff are the ints from inside my class obviously.
I did:

<br />
#include <ios><br />
using std::ostream;<br />

in the .h-file for this operator function (and I also include it in its .cpp-file), so I can refer to ostreams just fine. The error I get is:

<br />
no operator "<<" matches these operands<br />
operand types are: std::ostream << const int<br />
    return os << t.tms[TIM] << ':' << t.tms[MIN] << ':' << t.tms[SEK];<br />
----------^<br />

but it doesn't matter what else i try to feed the ostream& os,
all I can return seems to be 'os' itself! I can't feed chars
to it either, and definately not my precious ints Cry | :((

Ironically, I more or less copied this function from section
21.2.3 in my edition of Bjarne Stroustrup's 'The C++ language'
and I can't tell the difference between his and mine (and besides
mine worked earlier as I said). Puzzling!

Thanks for any help
regards
/Petter

.pdf to .txt conversion

Chintan3-Sep-03 0:35

Chintan

3-Sep-03 0:35

Hello Guys,

Can anybody of you can give me some ideas or links or code about how to convert .pdf file into .txt file.

Lot of readymade applications are available on net. I don't interested in all those but I want to make my own application for conversation.

Thanking You

C.R.Naik

Re: .pdf to .txt conversion

David Crow3-Sep-03 2:47

David Crow

3-Sep-03 2:47

You'll need to use the PDF SDK.

C++ related issue

Jamal Jamshed3-Sep-03 0:29

Jamal Jamshed

3-Sep-03 0:29

Friends,

Suppose we pass an object of a certain class as a reference to two other classes. It means that the two classes have a "same" copy of an object. This is a type of "composition"

Now insted of "composition", i want to get the same effect using "inheritance" OR i want my derived classes to inherit from "same" base class. Same base class means that the same base subobject. If one class make any change in the data of its parent, then the change should get reflected in the second class as its parent is same as that of first class.

How is it possible ???

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