C / C++ / MFC

Re: Cstring to char * error [modified]

21-Jun-06 9:12

kitty5 wrote:
// Check if the string starts with a '0x'
if(nStringSize > 2 && ('0' == string[0]) && (('x' == string[1]) || ('X' == string[1])))
{
for(i = 2; i < nStringSize; i++)
{
cReturn = cReturn*16;
// Decode ASCII
if((string[i] >= '0') && (string[i] <= '9'))
cReturn += string[i] - '0';
else if((string[i] >= 'A') && (string[i] <= 'F'))
cReturn += string[i] - 'A' + 0xa;
else if((string[i] >= 'a') && (string[i] <= 'f'))
cReturn += string[i] - 'a' + 0xa;
else
// Incorrect character
return 0;
}
return cReturn;
}
else return atol(string);

Why don't you save yourself a lot of grief and use strtol() instead?

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

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

kitty521-Jun-06 9:29

kitty5

21-Jun-06 9:29

b/c atol's and strtol's parameter is const char*... not CString

Kitty5

-- modified at 15:33 Wednesday 21st June, 2006

Re: Cstring to char * error

David Crow21-Jun-06 9:35

21-Jun-06 9:35

Are you not familar with CString's LPCTSTR() operator? Smile | :)

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

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

list in mfc

kamalesh8221-Jun-06 7:42

kamalesh82

21-Jun-06 7:42

How can i access(by iterating)list in the file, which is supplied dynamically(browsing to select file using CFileDialog)during the execution in vc++(mfc) project??

kamalesh

led mike21-Jun-06 7:55

led mike

21-Jun-06 7:55

Use CFileDialog::GetPathName() to get the path of the file. Then open the file. Then read the data from the file.

Re: list in mfc [modified]

kamalesh8221-Jun-06 8:00

kamalesh82

21-Jun-06 8:00

ya i already used that.frm thre i can read only the 1st list.but iterating the list using Clist, it's not happening. can u tell me that? how to iterate in this file?

kamalesh

Zac Howland21-Jun-06 8:35

Zac Howland

21-Jun-06 8:35

If you set the OFN_ALLOWMULTISELECT flag for the dialog, you use the following code to iterate through the list of path names:

CFileDialog dlg(...); // use appropriate settings<br />
if (dlg.DoModal() == IDOK)<br />
{<br />
POSITION pos = dlg.GetStartPosition();<br />
while (NULL != pos)<br />
{<br />
CString newPath = dlg.GetNextPathName(pos);<br />
// do something with newPath<br />
}

Is that what you are trying to do?

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

-- modified at 15:29 Wednesday 21st June, 2006

David Crow21-Jun-06 9:11

21-Jun-06 9:11

kamalesh82 wrote:
frm thre i can read only the 1st list

What list? Are you trying to read the contents of the selected file?

kamalesh82 wrote:
...but iterating the list using Clist...

How are you using CList?

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

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

led mike21-Jun-06 10:19

led mike

21-Jun-06 10:19

and let me add... Confused | :confused:

Hamid_RT21-Jun-06 19:31

Hamid_RT

21-Jun-06 19:31

if you want to read file and directory names with CListBox use DlgDirList

whitesky

Double to String

Max++21-Jun-06 6:59

Max++

21-Jun-06 6:59

I use function _gcvt() for convert the double value to string such as:

y = 0.01;
_gcvt(y,10,buffer);
MessageBox(buffer);

My problem is that the MessageBox will show "1.e-002".
How to do if want the string "0.01" after finish this function.

Re: Double to String

Greg Daye21-Jun-06 7:04

Greg Daye

21-Jun-06 7:04

you could try doing a sprintf.

y = 0.01;
sprintf ( buffer, "%f", y );

Re: Double to String

Jun Du21-Jun-06 7:08

Jun Du

21-Jun-06 7:08

Use

sprintf(buffer, "%f8.2", y);

instead.

Best,
Jun

Re: Double to String

Hamid_RT21-Jun-06 19:25

Hamid_RT

21-Jun-06 19:25

or see here

<br />
	double y = 1230.01;<br />
	CString strxx;<br />
	strxx.Format("%lf", y );<br />
	MessageBox(strxx);<br />

whitesky

MFC CfileDialog

Manjunath S21-Jun-06 6:38

21-Jun-06 6:38

Hi,
The below code for cfiledialog is have some problem. the problem is when i
press open many times the file dialog box opens ,but sometimes ( at any time ) when file dialog is open and if i press some starting character to select particular file ,the whole application closes automatically..

myclass::OnOpen() {
CFileDialog dlg(TRUE);

Sleep(50);
if (dlg.DoModal() == IDOK) {
l_strFileName = dlg.GetPathName();
MessageBox(l_strFileName);
filepath2 = (char *) (LPCTSTR) l_strFileName;
m_select.ShowWindow(SW_HIDE);
m_start.ShowWindow(SW_SHOW);
m_ed.SetWindowText(l_strFileName);

} }

Manjunath S
GESL
Bangalore

David Crow21-Jun-06 6:50

21-Jun-06 6:50

Manjunath S wrote:
Sleep(50);

What's this for? A gratuitous Sleep() is usually an indication of something gone wrong.

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

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

Manjunath S21-Jun-06 7:20

21-Jun-06 7:20

Hi ,
If i remove sleep then also iam getting same error.

Manjunath S
GESL
Bangalore

led mike21-Jun-06 7:33

led mike

21-Jun-06 7:33

Then you're giving the gratuity somewhere else.

Manjunath S21-Jun-06 7:42

21-Jun-06 7:42

can i get any sample code regarding ,to open fileopen dialog box

Manjunath S
GESL
Bangalore

David Crow21-Jun-06 7:37

21-Jun-06 7:37

Exactly what steps are you taking to reproduce the problem? Does it happen with every folder, or one in particular? What character are you typing? Is Enter/Return clicked? Does the same thing happen with GetOpenFileName()?

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

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

Manjunath S21-Jun-06 7:47

21-Jun-06 7:47

Hi,
In every folder iam facing this problem,but not every time . once in while (frequency is 1 time for 20 times trying)my whole application closes....

Manjunath S
GESL
Bangalore

Justin Tay21-Jun-06 7:53

Justin Tay

21-Jun-06 7:53

David Crow21-Jun-06 7:58

21-Jun-06 7:58

Manjunath S wrote:
once in while (frequency is 1 time for 20 times trying)my whole application closes....

You've got problems elsewhere that are manifesting at the point in which you are using CFileDialog. This code should run 20+ times with no troubles:

CFileDialog dlg(TRUE);
if (dlg.DoModal() == IDOK)
    AfxMessageBox(dlg.GetPathName());

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

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