CString -> Float; Float -> CString - C / C++ / MFC Discussion Boards

George_George21-Sep-08 23:22

21-Sep-08 23:22

No problem, Matthew!

Let us just talk in C++ context.

1.

Whether my understanding is correct -- "I think the purpose of such struct definition is, defining struct and a variable of the type (in this sample type tFoo) altogether"?

2.

Any benefits of using such type of definition?

regards,
George

Re: Strange struct definition

Matthew Faithfull21-Sep-08 23:37

Matthew Faithfull

21-Sep-08 23:37

As C Pallini said

1. Yes
2. No

"The secret of happiness is freedom, and the secret of freedom, courage."
Thucydides (B.C. 460-400)

Re: Strange struct definition

George_George22-Sep-08 0:04

George_George

22-Sep-08 0:04

Thanks Matthew!

regards,
George

Re: Strange struct definition

CPallini19-Sep-08 7:30

CPallini

19-Sep-08 7:30

George_George wrote:
int main(){ Foo; return 0;}

That's strange... Big Grin | :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Strange struct definition

George_George20-Sep-08 1:49

George_George

20-Sep-08 1:49

Hi CPallini,

Please ignore the code in main. Smile | :)

I mean the code outside main.

Let me clarify my question,

1. my question is whether the below understanding is correct?

I think the purpose of such struct definition is, defining struct and a
variable of the type (in this sample type tFoo) altogether

2. any other benefits of using such type of definition?

regards,
George

Re: Strange struct definition

CPallini20-Sep-08 21:41

CPallini

20-Sep-08 21:41

George_George wrote:
1. my question is whether the below understanding is correct?

I think the purpose of such struct definition is, defining struct and a
variable of the type (in this sample type tFoo) altogether

Yes.

George_George wrote:
2. any other benefits of using such type of definition?

No.

Re: Strange struct definition

George_George20-Sep-08 22:13

George_George

20-Sep-08 22:13

Cool, CPallini!

regards,
George

CString -> Float; Float -> CString

Opa Knack19-Sep-08 3:55

Opa Knack

19-Sep-08 3:55

Hi,
I'm trying to read a file which contains lines like "0.14779E+02".
A made a function which return a vector\<float\>.

std::vector\<float\> readData() {
	std::vector<float> fResult;

	CString dataFile = _T("C:\\d2.txt");

	std::ifstream input(dataFile);

	if (!input) {
		MessageBox(0, L"input file cannot be opened", L"error", MB_OK);
		return fResult;
	}

	std::string c;
	float fLesen;
	
	while (!input.eof()) {
		std::getline(input, c);

		fLesen = atof((const char*)(LPCTSTR)c.c_str());
		fResult.push_back(fLesen);

	}
	input.close();

	return fResult;
}</float>

Every time I'm trying to print out the float with something like that:

std::vector\<float\> lines = readData();
	for (int i = 0; i < sizeof(lines); i++) {
		CString a;
		a.Format(_T("%f"), lines[i]);
		MessageBox((LPCTSTR)a, L"error", MB_OK);
	}

the variable a is emtpy.
What am I doing wrong?
Thanks in advance.

Re: CString -> Float; Float -> CString

Mark Salsbery19-Sep-08 6:08

Mark Salsbery

19-Sep-08 6:08

Opa Knack wrote:
the variable a is emtpy.

Have you run this in the debugger to see why?

Opa Knack wrote:
for (int i = 0; i < sizeof(lines); i++) {

sizeof gives you the size of an object, not the number of elements in the vector.

Try

for (vector <float>::size_type  i = 0; i < lines.size(); i++)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: CString -> Float; Float -> CString

Opa Knack22-Sep-08 2:21

Opa Knack

22-Sep-08 2:21

In the debugger I can see that 'lines' has the expected values stored in float format.

It's just that the MessageBoxes are always emtpy.

Re: CString -> Float; Float -> CString

Mark Salsbery22-Sep-08 4:46

Mark Salsbery

22-Sep-08 4:46

Opa Knack wrote:
In the debugger I can see that 'lines' has the expected values stored in float format.

That must not be true.

I tested your code like this:

std::vector<float> lines;
lines.push_back(1.00);
lines.push_back(2.00);
lines.push_back(3.00);
for (vector <float>::size_type  i = 0; i < lines.size(); i++) {
    CString a;
    a.Format(_T("%f"), lines[i]);
    MessageBox(a, L"error", MB_OK);
}

and it works fine.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

How to parse the string

Member 443453619-Sep-08 2:44

Member 4434536

19-Sep-08 2:44

Hi all..
I have the string of the following format.

example: http://server/sharanu/inbox/test.jpg

Now i want to get only the string inbox and sharanu..

can anyone help me..

thank you

Re: How to parse the string

Malli_S19-Sep-08 3:00

Malli_S

19-Sep-08 3:00

This may help you !

Re: How to parse the string

enhzflep19-Sep-08 3:08

enhzflep

19-Sep-08 3:08

Re: How to parse the string

Malli_S19-Sep-08 3:12

Malli_S

19-Sep-08 3:12

$Shucks | :-\$

-Malli...!

Re: How to parse the string

Malli_S19-Sep-08 3:00

Malli_S

19-Sep-08 3:00

This[^] may help you !

Re: How to parse the string

_AnsHUMAN_ 19-Sep-08 3:02

_AnsHUMAN_

19-Sep-08 3:02

Use CString::ReverFind alongwith CString::Right or CString::Left to extract the string you want.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: How to parse the string

CPallini19-Sep-08 3:03

CPallini

19-Sep-08 3:03

Search for the '/' token
(plain C)
strtok [^]?

(ATL/MFC)
CStringT::Tokenize [^].

Smile | :)

Re: How to parse the string

Sandeep Saini SRE21-Sep-08 20:31

Sandeep Saini SRE

21-Sep-08 20:31

CString str = "http://server/sharanu/inbox/test.jpg";
int i = str.ReverseFind('/');
str = str.Left(i);
CString sValue1 = str.Right(str.GetLength() - str.ReverseFind('/') -1);

i = str.ReverseFind('/');
str = str.Left(i);
CString sValue2 = str.Right(str.GetLength() - str.ReverseFind('/') -1);

how to change systemtime with c++

tarunkakkar199119-Sep-08 2:43

tarunkakkar1991

19-Sep-08 2:43

sir i am new in c++.we are just doing general program in c++ like adding two numbers or nested classes.sir can you help me in network nprogramming and how to learn about other headre files and reserved variables like time_now.if you have ebook please give me the link.

Re: how to change systemtime with c++

CPallini19-Sep-08 2:54

CPallini

19-Sep-08 2:54

What has to do your message with its title?

Re: how to change systemtime with c++

David Crow19-Sep-08 3:15

David Crow

19-Sep-08 3:15

Per your post's subject, see SetLocalTime() and SetSystemTime().

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

How to Disable Tree View Selection?

Stuck At Zero19-Sep-08 2:42

Stuck At Zero

19-Sep-08 2:42

How do I go about entirely disabling a Tree View's selection? I want my app to focus on a node via the user's mouse and not by the default of the keyboard selection. Otherwise, the keyboard selection does not follow the user's mouse clicks.

How to Identify Which Control send the Message in mfc??

Vikas_12319-Sep-08 2:25

Vikas_123

19-Sep-08 2:25

Hi,

I have a custom ListCtrlEx which embeds a combobox in it. When the selection of combobox changes I am sending a user defined message to its parent(ListCtrlEx here) using GetParent()->SendMessage() and from ListCtrlEx again to its parent that is the dialog box(here) and handling the message there for identifying the changed row and coloumn. Now my query is if I use 2 ListCtrlEx controls in one dialog box, How do I identify from which ListCtrlEx I got the notification from?? Whihc parameter should I pack in WPARAM so I can uniquely identify the ListCtrlEx which send the message.

Any help would be appreciated.

With Reagards
Vikas

Re: How to Identify Which Control send the Message in mfc??

CPallini19-Sep-08 2:41

CPallini

19-Sep-08 2:41

the ID or the window

Vikas_123 wrote:
Whihc parameter should I pack in WPARAM so I can uniquely identify the ListCtrlEx which send the message.

You may use either the ListView control ID or its window handle.
Smile | :)

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