C / C++ / MFC

Re: how to open a *.txt file

22-Jun-06 4:06

I see at least three separate issues here. What exactly are you having trouble with:

1) opening a file
2) responding to a button click
3) reading from an edit control

Be specific with your request(s) and you'll get way more help.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Hamid_RT22-Jun-06 20:10

Hamid_RT

22-Jun-06 20:10

you can use (CFile /CArchive) to open file and use SetWindowText to set filename in editbox
and for change color from editbox use OnCtlColor.

whitesky

values reading from a text document

divisameer22-Jun-06 3:46

divisameer

22-Jun-06 3:46

i would like to read the values of two col and some rows (more than two)from the *.txt file and to find sum of those cols separately.
for ex
1 2
2 3
respective values are 3 and 5.

kindly provide me solution if any body got some idea.
regards
saisameer

divi saisameer

_AnsHUMAN_ 22-Jun-06 3:50

_AnsHUMAN_

22-Jun-06 3:50

One way is to Create a strucure as
struct numberStruct{
int m_iX;
int m_iY;
};
Now while writing and reading using FILE object write/read the complete structure using fwrite and fread.

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

_AnShUmAn_

Cedric Moonen22-Jun-06 3:54

Cedric Moonen

22-Jun-06 3:54

This won't work at all: you will write binary data to the file which is not what the OP wanted to do.

Cédric Moonen
Software developer

Charting control

toxcct22-Jun-06 3:58

toxcct

22-Jun-06 3:58

it wont work. he has a text file, not a binary one...

and your method doesn't take in account the space delimiters between the values in one line...

however, the idea of the struct can be a good memory representation, once the file is read, to load its content in memory

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

_AnsHUMAN_ 22-Jun-06 4:02

_AnsHUMAN_

22-Jun-06 4:02

Overlooked "TEXT FILE" Sleepy | :zzz:

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

_AnShUmAn_

Stephen Hewitt22-Jun-06 4:00

Stephen Hewitt

22-Jun-06 4:00

Try this:
---------

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>

int main(int argc, char* argv[])
{
using namespace std;

// Open the file.
ifstream fs("C:\\a.txt");
if (!fs)
{
cerr << "Couldn't open file!" << endl;
return 1;
}

// Read in the lines and sum them.
string line;
while ( getline(fs, line) ) // Get a line.
{
// Sum each number in this line.
int num;
int sum = 0;
istringstream iss(line);
while ( iss>>num )
{
sum += num;
}

// Output the result.
cout << "Total: " << sum << endl;

}

return 0;
}

Steve

David Crow22-Jun-06 4:01

22-Jun-06 4:01

For starters:

int n1, n2;
FILE *pFile = fopen(..., "rt");
while (! feof(pFile))
{
    fscanf("%d %d", &n1, &n2);
    // do something with n1 and n2
}
fclose(pFile);

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Zac Howland22-Jun-06 4:11

Zac Howland

22-Jun-06 4:11

Here is a very basic solution:

<br />
void main()<br />
{<br />
	vector<int> Col1, Col2;<br />
	ifstream fin("mytext.txt");<br />
	while (!fin.eof())<br />
	{<br />
		int c1, c2;<br />
		fin >> c1 >> c2;<br />
		Col1.push_back(c1);<br />
		Col2.push_back(c2);<br />
		if (fin.eof())<br />
		{<br />
			break;<br />
		}<br />
	}<br />
<br />
	int Column1Total = accumulate(Col1.begin(), Col1.end(), 0, add<int>());	<br />
	int Column2Total = accumulate(Col2.begin(), Col2.end(), 0, add<int>());<br />
}

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

dynamic radio button

Tara1422-Jun-06 3:33

22-Jun-06 3:33

Hi,

I need to dynamically create 3-5 radio button on a dialog box in vc++6 using mfc.

Please can somebody help me. I am just not getting it.

Thanks,
Tara

Fortitudine Vinsinues!

David Crow22-Jun-06 3:37

22-Jun-06 3:37

Having you considered using the CButton::Create() method? What code do you have that is not working?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Tara1422-Jun-06 3:41

Re: dynamic radio button [modified]

22-Jun-06 3:41

This is what I have done:

void CBudget::CreateRadioButtons()<br />
{<br />
 CButton newRadio;<br />
 CRect rect;<br />
<br />
#define IDD_NEWR1 0x1234<br />
<br />
rect.bottom=150;<br />
rect.top=100;<br />
rect.left=100;<br />
rect.right=250;<br />
<br />
 newRadio.Create(_T("Home"), WS_CHILD | WS_VISIBLE | WS_TABSTOP | BS_RADIOBUTTON, rect, this, IDD_NEWR1);<br />

but nothing showsup. I have called

CreateRadioButtons()

in OnInitDialog()

Fortitudine Vinsinues!

Viorel.22-Jun-06 3:49

Viorel.

22-Jun-06 3:49

I think you should move the CButton newRadio; declaration to the class body. Make it as a data member of CBudget. Otherwise your control is deleted after finishing the CreateRadioButtons function.

-- modified at 9:50 Thursday 22nd June, 2006

Another solution is to put your controls in the dialog using Dialog editor, making them invisible. When you need to show them, just make visible. In this way is easier to define event handlers for your controls.

Tara1422-Jun-06 3:53

22-Jun-06 3:53

Ah yes! It worked. Thanks.

Now, if I create 3 buttons, how do set then as a group. i.e how do I use them? How do I get which radio button has been selected.

Fortitudine Vinsinues!

David Crow22-Jun-06 3:56

22-Jun-06 3:56

TheinstruTara wrote:
...how do set then as a group...

Use the WS_GROUP style for the first one.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

_AnsHUMAN_ 22-Jun-06 3:59

_AnsHUMAN_

22-Jun-06 3:59

Add Handler's for them in message map section
ON_BN_CLICKED(ID_RADBUTTON ,OnRadioClicked) // Defined ID_RADBUTTON

//in the header file
afx_msg void OnRadioClicked();
//and in the cpp file
void CCheck1Dlg::OnRadioClicked(){
//Some COde
}

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

_AnShUmAn_

Tara1422-Jun-06 3:57

22-Jun-06 3:57

The problem is I do now know how many will be needed. It dependes upon how many budget entries a user makes.

Fortitudine Vinsinues!

Tara1422-Jun-06 4:02

22-Jun-06 4:02

Can I not create another radio button using the same CButton object, newRadio?

Fortitudine Vinsinues!

David Crow22-Jun-06 4:08

22-Jun-06 4:08

Yes, but newRadio will need to be a pointer.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Viorel.22-Jun-06 4:13

Viorel.

22-Jun-06 4:13

A CButton object is for one radio button. If you need more, define another CButton data member.

In case of variable number, you can define a dynamic collection of such objects. For instance, you can try CTypedPtrArray< CObArray, CButton * >.

You have to create new buttons with new CButton, then call Create, and then add to collection with Add. Do not forget to delete the unneded buttons with delete.

Tara1422-Jun-06 4:19