C / C++ / MFC

8-Aug-08 13:34

How can I get CFileDialog in Save As mode to change the default file name extension according to the chosen file type like most MS apps work?

Mark Salsbery8-Aug-08 14:04

8-Aug-08 14:04

This could work:

1) Derive a class from CFileDialog

2) Override the OnTypeChange() method (the CDN_TYPECHANGE
notification handler)

3) In your OnTypeChange() override, use CFileDialog::SetControlText()
to set the text for the control containing the filename to the
appropriate default filename (the IDs for the controls can be
found here: Open and Save As Dialog Boxes[^])

Mark

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

Darryl Bryk14-Aug-08 14:45

14-Aug-08 14:45

Mark,

OK, but how do I get the filename? I have found some code like this but it doesn't work for some reason:

CWnd *fileNameBox = GetParent()->GetDlgItem(edt1);
ASSERT_VALID(fileNameBox);
CString fileName;
fileNameBox->GetWindowText(fileName);

Mark Salsbery14-Aug-08 16:40

14-Aug-08 16:40

How doesn't it work? What is the call to GetParent() doing?
I would think that code would be in the actual dialog class.

Mark

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

Darryl Bryk15-Aug-08 7:02

15-Aug-08 7:02

It looks like its failing on the ASSERT. I found this code and I'm not sure why the call to GetParent() is there, I thought maybe it needed a window handle pointer.

The filename string can be obtained after the dlg. closes. But I want to look at what the user has in the file name field and the chosen ext. and make the filename ext change as the ext. changes from the combo field. It seems like this should be a std. way for the dlg to work (MS Office apps work this way).

Mark Salsbery15-Aug-08 7:21

15-Aug-08 7:21

If you derived a class from CFileDialog, you
should be able to do something like this:

void CMyFileDialog::OnTypeChange()
{
   CWnd *fileNameBox = GetDlgItem(edt1);
   ASSERT_VALID(fileNameBox);
   CString fileName;
   fileNameBox->GetWindowText(fileName);
}

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

Darryl Bryk14-Oct-08 7:36

14-Oct-08 7:36

Hi Mark,

Thanks for your help. Just to follow up on this, it turns out you need the ptr. to GetParent() because the "CFileDialog is actually a child of the real dialog" according to - http://msdn.microsoft.com/en-us/magazine/cc301466.aspx.

So you need something like this to access the file name and type, modify it to the set type and display it:

void CMyFileDialog::OnTypeChange()
{
CFileDialog::OnTypeChange(); // Base class

CString fileName, ext;
GetParent()->GetDlgItemText(cmb13, fileName); // Get file name
GetParent()->GetDlgItemText(cmb1, ext); // Get extension
int i;
if ((i = fileName.ReverseFind('.')) != -1) {
fileName.Truncate(i);
if ((i = ext.ReverseFind('.')) != -1) {
ext.Truncate(i + 4);
fileName += "." + ext.Right(3);
}
}
GetParent()->SetDlgItemText(cmb13, fileName); // Get file name

return;
}

Thanks again,
Darryl

Mark Salsbery14-Oct-08 8:30

Re: DLL Lookup based on UUID

14-Oct-08 8:30

Darryl Bryk wrote:
it turns out you need the ptr. to GetParent() because the "CFileDialog is actually a child of the real dialog"

Good to know!

Thanks for the update!

Mark

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

DLL Lookup based on UUID

bulg8-Aug-08 13:05

bulg

8-Aug-08 13:05

Is there a way to do <title>?

Randor 10-Aug-08 5:13

Randor

10-Aug-08 5:13

Assuming that you are referring to the GUID of a COM DLL.

http://msdn.microsoft.com/en-us/library/ms691424(VS.85).aspx[^]

The InprocHandler/InprocHandler32[^] registry key will contain the filename for the COM interface.

Best Wishes,
-David Delaune

Re: DLL Lookup based on UUID

bulg12-Aug-08 12:34

bulg

12-Aug-08 12:34

Thanks, that's just it

C++ Lat and Long distance question

winburn8-Aug-08 11:22

8-Aug-08 11:22

I am trying to read two cities with their Lat and Longs from a text file so I can compute the distance between them.

the text file format is San Francisco 37:47:48n 122:24:57n Honolulu 21:16:25n 157:49:13w

can anyone tell me how I can read from text file so I can do the math

or does anyone have a similar example out there that they have done.

Thanks

Perspx8-Aug-08 11:37

8-Aug-08 11:37

Split the string into words by looking for spaces, and put this into an array of char *s. Then look to see if the first character of each word is a number or not and if so, remove the end character and split it up by the colons; then simply use atoi() to convert these into numbers and do whatever you want with them Smile | :)

Hope this helps,
--Perspx

"The Blue Screen of Death, also known as The Blue Screen of Doom, the "Blue Screen of Fun", "Phatul Exception: The WRECKening" and "Windows Vista", is a multi award-winning game first developed in 1995 by Microsoft" - Uncyclopedia

Introduction to Object-Oriented JavaScript

winburn8-Aug-08 11:43

8-Aug-08 11:43

Thanks for the quick reply

what would the code look like to do that, the array I know but atoi() I don't.

what would you do?

Thanks

Perspx8-Aug-08 12:32

8-Aug-08 12:32

After some dabbling in my C IDE, I have come up with this to split the string up and put the lat/longitudes in an array:

char text[] = "San Francisco 37:47:48n 122:24:57n Honolulu 21:16:25n 157:49:13w";
char *input = (char *)text;
char **data = NULL;
char *ptr = NULL;

int i, datacount=0, curr=0, len;

for(i=0;i<(strlen(input)+1);++i) {
  if(input[i]==' '||input[i] == '\0') {
		len = (i-curr)-1; //-1 to strip the n, s, e or w.

		ptr = input+curr;

		if((ptr[0]>('0'-1))&&(ptr[0]<('9'+1)))  //Is the first character a number? If so it is the data
	  {
			datacount++;
			data = realloc(data, (datacount+1)*sizeof(char *));  //Allocate space for this data

		  data[datacount]=(char *)malloc(len);
		  strncpy(data[datacount], input+curr, len);
		  data[datacount][len]='\0';
	  }

    curr = (i+1);
	}
}

You can do something similar to split the numbers with the colons - the atoi() reference is here.

Hope this helps!
--Perspx

winburn8-Aug-08 12:47

8-Aug-08 12:47

Thank you I really appreciate the assistance, I didn't know there where people out there so willing to help.

Thank you! Thank you! Thank you!

Perspx8-Aug-08 12:50

8-Aug-08 12:50

No probs

Regards,
--Perspx

winburn8-Aug-08 13:51

8-Aug-08 13:51

2 questions
what do I need to do to finish this?
how would I pull this info if it was in a text file?

Thanks

Perspx8-Aug-08 14:14

8-Aug-08 14:14

You need to do whatever you need to do with the lat/longitudes stored
You would use the ReadFile() function (documentation here).

Hope this helps,
--Perspx

winburn8-Aug-08 14:23

8-Aug-08 14:23

I am two blocked

I have an error "invalid conversion from void to char" on the:

data = realloc (data, (datacount +1)*size of (char*));

Perspx8-Aug-08 22:50