Re: Auto-scroll a CDialog - C / C++ / MFC Discussion Boards

poiut28-Dec-04 7:09

28-Dec-04 7:09

Since I am having problem using drawdragrect(can't get it to work with scrolling) I decided to draw my own draggable rectangle.

I did it with Rectangle and SetROP2(R2_XORPEN). But the problem with that is when I drag the rectangle would inverse the color thus fill the rectangle with black color. Any way around this?

I tried it with Lineto but it would also inverse the color when two line meet at the edge. I tried to set it so line wouldn't overlap but the problem with that it would actually create gap.

Now I am doing Polyline which seems to work. Is this how most people draw their draggable rectangle?

Connecting with IOCompletionPort

Menny Even Danan28-Dec-04 7:04

Menny Even Danan

28-Dec-04 7:04

Hello.
i'm trying to use IOCompletionPort while connecting to servers.

i have one client program which suppose to connect to alot of servers.
i want to do to connection with IOCompletionPort mechanism.

can anyone help me with it a bit?

i need some guidelines. my connecting is alway in blocking mode.

thanks

How to serialize CTreeCtrl?

Tanmay Sathe28-Dec-04 6:57

Tanmay Sathe

28-Dec-04 6:57

I want to serialize CMyTreeCtrl. This class is derived from CTreeCtrl. Can I serialize the whole tree? Confused | :confused:

MiKE

Eliminating Flickering when resizing a window

Member 148659428-Dec-04 6:52

Member 1486594

28-Dec-04 6:52

I need to eliminate flickering when resizing a derived CMDIChildWnd window that displays an image (already available in memory). I can display a series of images without flickering by opening all images in memory, and painting them from there (File access is done once only). However, I can't seem to get rid of flickering when resizing.
I tried modifying the OnPaint, OnSize, and OnSizing messages, but to no avail.

Please Help
Fayez

Re: Eliminating Flickering when resizing a window

SteveKing28-Dec-04 7:00

SteveKing

28-Dec-04 7:00

Try modifying OnErase() which erases the background.

Re: Eliminating Flickering when resizing a window

Member 148659428-Dec-04 7:26

Member 1486594

28-Dec-04 7:26

Thank you very much, that works perfect! BTW, I think it was the OnEraseBkgnd()

Auto-scroll a CDialog

DanYELL28-Dec-04 6:00

DanYELL

28-Dec-04 6:00

I have a dialog with vertical scroll bars and lots of
text and edit boxes. Any ideas on how to automatically
scroll down the dialog as the user is typing in
information? Or somehow, if the user is in a certain
edit box, that it scroll to center itself rather than
making the user scroll down?

Please, any response any one can give me will be greatly
appreciated.

Sincerely,
Danielle (an overworked graduate student)

Re: Auto-scroll a CDialog

Gary R. Wheeler29-Dec-04 1:32

Gary R. Wheeler

29-Dec-04 1:32

I'll assume you've got the scrolling working to your satisfaction. When you use the scroll bars, the contents of the dialog scroll appropriately.

DanYELL wrote:
if the user is in a certain
edit box, that it scroll to center itself rather than
making the user scroll down

You can do this by handling the EN_SETFOCUS[^] notification from the edit controls in the parent dialog. EN_SETFOCUS is sent by an edit control to its parent window (the dialog, in this case) when it receives the focus. In the parent dialog, you can use this to scroll the dialog so that the edit control is in view.

Software Zen: delete this;

Using MapPoint classes generated from Type Library

BlackDice28-Dec-04 4:55

BlackDice

28-Dec-04 4:55

I've imported the classes into my app and generated the MFC wrapper classes from the file "MPNA81.TLB". All the classes are there, but I don't know how to put a map control on my dialog. I tried using just the mappoint activex control, but this doesn't have all the functionality I need. I've seen examples where the typelib is used, but then that code instatntiates the application object. I just want the map displayed on my dialog so that I can make routes and place markers at the appropriate stop. Is there a way to do this without opening the whole MapPoint app? Any help is appreciated. Thanks in advance

My articles

www.stillwaterexpress.com

BlackDice

Code-a-phone

David Crow28-Dec-04 4:18

David Crow

28-Dec-04 4:18

Check out what's being displayed on this phone:

http://www.cnn.com/2004/TECH/ptech/12/27/cell.phone.viruses.ap/index.html

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Code-a-phone

Tom Wright29-Dec-04 4:19

Tom Wright

29-Dec-04 4:19

interesting....does the mean that I can program a phone using c++?

Tom Wright
tawright915@yahoo.com

Re: Code-a-phone

David Crow29-Dec-04 4:45

David Crow

29-Dec-04 4:45

Tom Wright wrote:
does the mean that I can program a phone using c++?

I'm not big into telephony, but it would not surprise me one bit, especially with the newer, more powerful ~~computer~~ phones.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

what is the error in the following code? (not giving the required output).

babur khan28-Dec-04 3:38

babur khan

28-Dec-04 3:38

This program in g++ under liunux. then i made it to compile it under vc++(of course i have to change things slightly). the program is compiling without any error but it is not giving any output.

This code is compiled under VC++:

#include <iostream>
#include <set>
#include <queue>
#include <list>

using namespace std;

#include <stdio.h> // 2

struct Situation {
set<int> left, right;
bool torchLeft;
int minutesPassed;
list<string> description;
};

bool operator<(const Situation &a, const Situation &b)
{
return a.minutesPassed > b.minutesPassed;
}

int main()
{
const char *n[11] = { 0, "A", "B", 0, 0, "C", 0, 0, 0, 0, "D" };
priority_queue<Situation> q;
Situation s;
char d[256];

// initial situation: all persons and torch on the left
s.left.insert(1);
s.left.insert(2);
s.left.insert(5);
s.left.insert(10);
s.torchLeft = true;
s.minutesPassed = 0;
q.push(s);

while (!q.empty()) {

// q is sorted by minutesPassed increasing, get the top-most
// entry, which has the shortest minutesPassed of the queue
s = q.top();
q.pop();

// if all persons are on the right, this is a solution
if (s.left.empty()) {
cout << "solution found: " << s.minutesPassed <<
" minutes" << endl;
for (list<string>::iterator i = s.description.begin();
i != s.description.end(); ++i)
cout << " " << (*i).c_str << endl; // 1
cout << endl;
continue;
}

set<int> &src = s.torchLeft ? s.left : s.right;

// single person moving
for (set<int>::iterator i = src.begin(); i != src.end(); ++i) {
Situation t = s;
if (t.torchLeft) {
t.left.erase(*i);
t.right.insert(*i);
} else {
t.right.erase(*i);
t.left.insert(*i);
}
t.minutesPassed += *i;
if (t.minutesPassed >= 18)
continue;
_snprintf(d, sizeof(d), "%s moves %s (%d minutes, %d " // 2
"total)", n[*i], t.torchLeft ? "across" : "back",
*i, t.minutesPassed);
t.description.insert(t.description.end(), d);
t.torchLeft = !t.torchLeft;
q.push(t);
}

// two persons moving
{ // 3
for (set<int>::iterator i = src.begin(); i != src.end(); ++i)
for (set<int>::iterator j = i; j != src.end(); ++j) {
if (j == i)
continue;
Situation t = s;
if (t.torchLeft) {
t.left.erase(*i);
t.left.erase(*j);
t.right.insert(*i);
t.right.insert(*j);
} else {
t.right.erase(*i);
t.right.erase(*j);
t.left.insert(*i);
t.left.insert(*j);
}
t.minutesPassed += *i > *j ? *i : *j;
if (t.minutesPassed >= 18)
continue;
_snprintf(d, sizeof(d), "%s and %s move %s (%d " // 2
"minutes, %d total)", n[*i], n[*j],
t.torchLeft ? "across" : "back",
*i > *j ? *i : *j, t.minutesPassed);
t.description.insert(t.description.end(), d);
t.torchLeft = !t.torchLeft;
q.push(t);
}
}
}

return 0;
}

the required output should be like this:
solution found: 17 minutes
A and B move across (2 minutes, 2 total)
A moves back (1 minutes, 3 total)
C and D move across (10 minutes, 13 total)
B moves back (2 minutes, 15 total)
A and B move across (2 minutes, 17 total)

solution found: 17 minutes
A and B move across (2 minutes, 2 total)
B moves back (2 minutes, 4 total)
C and D move across (10 minutes, 14 total)
A moves back (1 minutes, 15 total)
A and B move across (2 minutes, 17 total)

can you please point out the error and re-paste the correct code(so that i can compare and understand better), i will be thankful to you.

Re: what is the error in the following code? (not giving the required output).

El Corazon28-Dec-04 4:15

El Corazon

28-Dec-04 4:15

compile under debug (which may actually be the default setting if you haven't changed it in VC), and use the step function.

It will serve you better to learn how to watch the program progress through stepping through your own code as you can find your mistakes in the future faster. Use the step to step through one line at a time. With a program this size, it should be very easy and very rapid to step through. You can inspect variables using the tools in the system as well so that you have a full detailed knowledge of how things are progressing.

As your programs get more complicated, and you can narrow down where an error occurs before you debug, you can set a "break" which will stop execution and let you step through from that point forward. You shouldn't need that yet as this program is small. Do familiarize with the tools at your disposal. Similar tools are available in most compilers, if you know "what to look for" rather than specific instruction, you can find the same capability.

Use the help, search the index for key words, "debug" "trace" "step". There is a lot of information to help you if you learn where to look and what is there to help you.
Jeff

_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)

Re: what is the error in the following code? (not giving the required output).

Neville Franks28-Dec-04 9:09

Neville Franks

28-Dec-04 9:09

Neville Franks, Author of ED for Windows www.getsoft.com and Surfulater www.surfulater.com "Save what you Surf"

Finding type size

Franz Klein28-Dec-04 2:21

Franz Klein

28-Dec-04 2:21

I know that with the sizeof function I can determine how many bytes a type takes up e.g. char = 1 byte. However I want to parse C++ source code and then from the variables located in the parsed source code determine the byte size. I parse the variable type into a string but then sizeof determines the byte size of the string and not the actual variable type.

Does anybody know how I can do this? I.E. get the type of a variable from parsed code and then determine size.

Confused | :confused:

I am the handsome one in the crowd.

Re: Finding type size

C^hris L^osinger28-Dec-04 3:08

C^hris L^osinger

28-Dec-04 3:08

if (token = "int") size = sizeof(int);
else if (token = "char") size = sizeof(char);
else if (token = "foo") size = sizeof(foo);

etc..

C/C++ does not have a way to turn input (your parsed source code) into executable code (an actual sizeof(...) operation) on the fly, so anything you do like this has to be done as a lookup table of some kind.

Software | Cleek

Re: Finding type size

Gary R. Wheeler28-Dec-04 4:35

Gary R. Wheeler

28-Dec-04 4:35

In order to determine the size of a variable in an arbitrary piece of C++ code, you must replicate a significant portion of the functionality in a compiler. This is a major task.

Given that you tried to determine the size of a type based on the sizeof the string containing the type name, I would guess you're fairly new to programming. First of all, the sizeof operator doesn't usually return anything meaningful with regards to the contents of a string, since strings are usually represented as a pointer. Usually you need to use a function or class method that returns the string length. Secondly, the length of the type name has nothing to do with size of the type itself. Here's a couple of examples:

class S {
   char data[100000];
};
class ThisIsATypeWithAVeryLongNameAndLotsOfWords {
   char data;
};

Both S and ThisIsATypeWithAVeryLongNameAndLotsOfWords are type names, but as you can see, the length of the name doesn't affect the size of the underlying type. S occupies 100000 characters, while ThisIsATypeWithAVeryLongNameAndLotsOfWords only uses one.

What are you trying to accomplish here?

Software Zen: delete this;

Newest file on ftp

Dariusz M. Mikulski28-Dec-04 1:39

Dariusz M. Mikulski

28-Dec-04 1:39

I have very strange problem. See this code:

I used this mfc class to connect to ftp

CFtpConnection *m_pFtpConnection;
CInternetSession m_Session(NULL, 1, INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, INTERNET_FLAG_DONT_CACHE);
m_Session.SetOption(INTERNET_OPTION_REQUEST_FLAGS, INTERNET_REQFLAG_CACHE_WRITE_DISABLED);

end the connection:

try {
m_pFtpConnection = m_Session.GetFtpConnection(strHostname, strLogin, strPassword, nPort, bPassive);

m_pFtpConnection->SetCurrentDirectory(strFrom);

here i want get name of the newest file on ftp:

CFtpFileFind finder(m_pFtpConnection);

BOOL bWorking = finder.FindFile((LPCTSTR)strFrom, INTERNET_FLAG_DONT_CACHE | INTERNET_FLAG_RAW_DATA);

FILETIME ft1;

TimeStamp ts1(1971, 1, 1, 0, 0, 0);
TimeStamp ts2;

CString strGetFile;

while(bWorking) {
bWorking = finder.FindNextFile();
finder.GetLastWriteTime(&ft1);
TimeStamp ts2(ft1);
if(!finder.IsDots()) {
if(!finder.IsDirectory()) {
if(ts1

Progress Bar in StatusBar

Neelesh K J Jain28-Dec-04 1:04

Neelesh K J Jain

28-Dec-04 1:04

Hello Friends,
I have a progress bar with some data being displayed in it which is present on the StatusBar. My main problem is when ever I am resizing the window, the progress is not getting resized dynamically. I had used OnSize() member function, then also its not working. Please help me regarding this problem.

thanks in advance.

Neelesh K J Jain.

Hide Internet Explorer Menu Bars and Toolbars

Member 24341328-Dec-04 0:28

Member 243413

28-Dec-04 0:28

Hi!
Can anybody help me about how to hide toolbar and Menubar(File,Edit,View,Favourites,Tools,Help menu items) form Intenet Explorer leaving only the client area. Solution may be a visual c++ program reference or some registry settings.

Re: Hide Internet Explorer Menu Bars and Toolbars

gsaigopal28-Dec-04 0:31