C / C++ / MFC

19-Sep-06 9:45

See here.

"Talent without discipline is like an octopus on roller skates. There's plenty of movement, but you never know if it's going to be forward, backwards, or sideways." - H. Jackson Brown, Jr.

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Yanshof19-Sep-06 9:55

Yanshof

19-Sep-06 9:55

I just need to know how can i "say" the kernel of the operation system that the thread X will not be running until i will say it will.

David Crow19-Sep-06 10:08

19-Sep-06 10:08

Yanshof wrote:
...thread X will not be running until i will say it will.

So just use CREATE_SUSPENDED when creating it.

Yanshof19-Sep-06 10:37

Yanshof

19-Sep-06 10:37

The CREATE_SUSPEND flag is just for using ResumeThread(...) - but if the current thread is running ... how can i stop him and again set the thread continue running ? ( i guess that using ResumeThread again will make the thread run again )

David Crow19-Sep-06 10:46

19-Sep-06 10:46

Yanshof wrote:
The CREATE_SUSPEND flag is just for using ResumeThread(...)

Wrong. Why would you even think that? When you call a function named ResumeThread(), what purpose would a CREATE_SUSPENDED flag serve? _beginthread()

Yanshof wrote:
if the current thread is running ... how can i stop him and again set the thread continue running ? ( i guess that using ResumeThread again will make the thread run again )

Read the article I provided you. It plainly shows how to start, stop, suspend, and resume threads properly.

Zac Howland19-Sep-06 10:09

How To Delete A Specific Character In A String !!!

19-Sep-06 10:09

Google does wonders

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Mark_Murphy19-Sep-06 9:15

Mark_Murphy

19-Sep-06 9:15

Hi

I am new to C++
Just wondering if anyone can help out here.

I have a string consisting of all the letters of the alphabet.
eg: string Alphabet ("A B C D E F G H I J K L M N O P Q R S T U V W X Y Z");

I need to erase a particular letter of the alphabet within the string. eg H and then display the string back to the console app minus the letter erased.

I have tried playing around with Alphabet.erase() but so far have only managed to reduce the length of the string, not erase a specific character within it.

Can anyone show me how I could do this

Thanks in advance !!!

I really hate this darn machine;
I wish that they would sell it.
It won't do what I want it to,
but only what I tell it.
~Author Unknown

Re: How To Delete A Specific Character In A String !!!

Zac Howland19-Sep-06 9:27

Re: How To Delete A Specific Character In A String !!! [modified]

19-Sep-06 9:27

// predicate
bool removeChar(const char& c)
{
	if ('h' == c || 'H' == c)
		return true;
	return false;
}

// in code
string alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
alphabet.erase(remove_if(alphabet.begin(), alphabet.end(), removeChar), alphabet.end());

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

George L. Jackson19-Sep-06 9:39

George L. Jackson

19-Sep-06 9:39

To erase the letter, the previous solution works. The code below replaces the letter with a space:

wstring alphabet = L"ABCDEFGHIJKLMNOPQRSTUVWXYZ";

wstring::size_type pos = alphabet.find(L'H');

if (pos != wstring::npos)
alphabet.replace(pos, 1, 1, L' ');

wcout << L'[' << alphabet.c_str() << L']' << endl;

-- modified at 15:54 Tuesday 19th September, 2006

Internet Time?

Larsson19-Sep-06 9:13

Larsson

19-Sep-06 9:13

Hello! Please help me!,
Is it possible to check how long you have been on the Internet?

can you check when you start Internet explorer och when you close Internet explorer or it there a better way? Please help me.

David Crow19-Sep-06 9:52

19-Sep-06 9:52

If you are wanting to tie it to browser activity, then I suspect a Browser Helper Object (BHO) is what you are after.

Larsson19-Sep-06 12:55

Larsson

19-Sep-06 12:55

Thanks do you have ant pointers where I can check and if there are any exemple?

Christian Graus19-Sep-06 13:21

Christian Graus

19-Sep-06 13:21

When someone gives you a name, then google is all you need for more info.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

David Crow20-Sep-06 2:42

send args to constructor when using RUNTIME_CLASS

20-Sep-06 2:42

In addition to the link I already provided?

BlackDice19-Sep-06 9:02

BlackDice

19-Sep-06 9:02

I have a few nested splitters on my main screen and two of the panes use forms that are exactly the same in look and functionality except for a couple of strings. If there was a way I could send in some value to determine which stored procedure it should use to fill the list control, everything would be great and I could use an instance of the same class for both panes. But I create the formviews using RUNTIME_CLASS when creating the splitters.

While writing this post I've just thought about I could make the class I want to use a parent class, make two derived classes, each one calling the parent's constructor with the string or enum values I want. Something like this:

class CLeftFormView : public CMyFormView
{
      //call my CFormView constructor with string "leftpane"
};


class CRightFormView : public CMyFormView
{
      //call my CFormView constructor with string "rightpane"
};

This seems like it would work, but I wonder is there a better method for what I'm trying to do. Any suggestions are appreciated.

Thanks

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BlackDice

Re: send args to constructor when using RUNTIME_CLASS

Christopher Duncan19-Sep-06 16:56

Christopher Duncan

19-Sep-06 16:56

Actually, that seems like a pretty reasonable approach to me. I'd definitely give it a go.

Author of
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www.PracticalStrategyConsulting.com

Need fast method to read/convert floats from disk

nadiric19-Sep-06 8:35

nadiric

19-Sep-06 8:35

I'm reading a bunch of raw numerical data (floats representing verticies) from disk in one endian format, and need to convert it to another (flip the bytes around).

Currently I am reading the numbers one by one and bit-shifting them to the correct format, then placing them into their respective places in an array of verticies (float[3]'s).

I am trying to speed up this whole operation, and may be able to do so with a better method/algorithm. The following also may help:

- Each float is 4 bytes and needs a pure reversal of bytes - not bits (bytes 1234 become 4321)

- the floats are contiguous on disk
- I know ahead of time how many floats I will be loading into a given array
- The array will be pre-allocated to hold the right number of verticies
- I must keep (or end up with) the array two-dimensional (array of float[3]'s) for later OpenGL usage

not sure if reading them all in at once, and applying a macro-bit-shift would be faster?

Thanks for any help

Re: Need fast method to read/convert floats from disk

Zac Howland19-Sep-06 9:01

Re: Need fast method to read/convert floats from disk

19-Sep-06 9:01

nadiric wrote:
not sure if reading them all in at once, and applying a macro-bit-shift would be faster?

Yes. Reading them in one at a time increases disk access (which is expensive). Reading them in as a block decreases the number of reads required to get your data.

Something along the lines of the following should work:

// for converting float
float endian_shift(const float& f)
{
	float ret = 0.0;
	ret |= (f << 24);
	ret |= ((f >> 8) << 24) >> 8;
	ret |= ((f >> 16) << 24) >> 16;
	ret |= (f >> 24);
	return ret;
}

// for reading data
ifstream fin;
fin.open("myfile.dat", ios::binary);
vector<float> myData(SIZE);
copy(istream_iterator<float>(fin), istream_iterator<float>(), back_inserter(myData));
fin.close();
transform(myData.begin(), myData.end(), myData.begin(), endian_shift);

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

nadiric19-Sep-06 10:46

nadiric

19-Sep-06 10:46

Thanks for the reply,

Just tossing a few other thoughts around...

Given the following:

- vertex is of type float[3]
- verticies is an array of SIZE vertex (verticies = new vertex[SIZE];)
- vertsfromfile is an array of (SIZE*3) floats

are the floats in "verticies" aligned one after the other in this fashion:

verticies[0][0]verticies[0][1]verticies[0][2]verticies[1][0]verticies[1][1]...and so on to allow for something like memcpy(verticies,vertsfromfile,(sizeof(vertex)*SIZE)) ?

or is this just crazy talk?

Thanks

Re: Need fast method to read/convert floats from disk

Zac Howland20-Sep-06 10:25