Stack problem? - C / C++ / MFC Discussion Boards

Joaquín M López Muñoz10-Jul-02 19:59

10-Jul-02 19:59

Well, associate it a CListBox and then manually replace the type for CDragListBox in your source code.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: CDragListBox

Lucky200210-Jul-02 21:06

Lucky2002

10-Jul-02 21:06

Hello!

I change the type CListBox in CDragListBox.

Before: CListBox m_ctrlListBox;
After: CDragListBox m_ctrlListBox;

It´s changed in the class wizard too.

But when I run the programm I get a debug error. It doesn´t works.
Must I change something else?

Thank you!

Lucky2002

Re: CDragListBox

Joaquín M López Muñoz11-Jul-02 8:42

Joaquín M López Muñoz

11-Jul-02 8:42

Uhmmm... Check the docs, I think there' a couple of styles that must be checked for the control in order to associate to a CDragListCtrl.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: CDragListBox

Lucky200211-Jul-02 23:55

Lucky2002

11-Jul-02 23:55

Sorry, what are the docs ????

Lucky2002

Comments on Dynamic multidimensional CString Array???

Nitron10-Jul-02 6:11

Nitron

10-Jul-02 6:11

Ok, so I'm developing a post-processing data reduction and visualization program. I have all my graph controls and UI together with custom vector templates for the control's data and all that fun stuff. But my weak point is file IO and storing the data read from the files. The files are csv and don't necessarilly contain doubles for data. Some may be hex denoted by "0xABCD1234", or may even be an enumeration. So streaming the file into my vector templates was shady. So I created a class that has the following member (among others):

#define MAX_VARS 200
#define MAX_SAMP 75000

CString m_DataArray[MAX_SAMP][MAX_VARS];

I then allocate a 'new' CSV class and put one of these things on the heap. The good news is that the data is global for all my numerical analysis tools and functions and I can manipulate it fast. The bad news is that I rarely have 200 vars and 75000 samps, so mass memory is very wasted! Even worse, when I'm under the gun to outperform Excel or PV-Wave, I may have up to .25 Million samples or more (Excel dies @ 65536 / PV-wave can't do more than 2048 chars per line)!! I tried ohter CSV classes to access row,col but with many samples the process is slow.

Anyway, I'm just probing for alternatives. I tried CStringArray but got lost because all my routines operate on 2d arrays (row,col). Any comments or advise is certainly appreciated in advance.

Thanks All.

Nitron
_________________________________________--
message sent on 100% recycled electrons.

Re: Comments on Dynamic multidimensional CString Array???

Joaquín M López Muñoz10-Jul-02 8:17

Joaquín M López Muñoz

10-Jul-02 8:17

Ok, this might be a solution. Use a std::vector<std::vector<std::string> > >,which can easily grow on demand. To maintain the 2d array interface, wrap the thing into a class that provides the indexing feature:

class twodstringarray
{
  std::vector<std::vector<std::string> > > data;
public:
  std::string& operator()(size_t x,size_t y)
  {
    while(x>=data.size())data.push_back(std::vector<std::string>()); //add rows
    while(y>=data[x].size())data[x].push_back(""): // add items
    return data[x][y];
  }
};
...
twodstringarray array;
array(100,10)="hello"; // for instance.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Urgent help needed !!!

bisserke10-Jul-02 5:30

bisserke

10-Jul-02 5:30

Hi,

I tried to capture a WM_MOVING in a CDiaologBar subclass of mine to make it snap to the borders when in floating state.
But apparently ,if my DialogBar is floating, another Miniframe is built around my DialogBar. (or something like that)

How can I delegate the WM_MOVING message from this MiniFrame to DialogBar
without having to start all over again ? (because I really cannot afford the time)

Any help will be much appreciated.

I used to have a life ... now I have a computer

Stack problem?

innomino10-Jul-02 5:03

innomino

10-Jul-02 5:03

Hey gus I currently working on a project which change an math expression into a binary tree. But it seems that a stack problem has raised probably because of the stack. I tried to solved the problem but failed. Could someone do me a favor? Thanks!
//Source
#include <ctype.h>
#include <stdlib.h>
#include <stack>
#include <iostream.h>
#include <string>

struct Node
{
char* key;
Node* left;
Node* right;
};

bool ischar(char);
void calculate();
void evaluate(char*);
void inorder(Node*);
std::stack<char> stackOperator;
std::stack<node*> stackOperand;

void main()
{
char infix[50];
Node* node;

cout << "Expression: ";
cin >> infix;
evaluate(infix);
node = stackOperand.top();
cout << "print" << endl;
inorder(stackOperand.top());
}

bool ischar(char ch)
{
return isalpha(ch) || isdigit(ch) || ch == '.';
}

void calculate()
{
//Create a node combined with left and right trees
char op;
Node* temp;
Node* left;
Node* right;

op = stackOperator.top();
stackOperator.pop();
right = stackOperand.top();
cout << "r add: " << right << endl;
stackOperand.pop();
left = stackOperand.top();
cout << "l add: " << left << endl;
stackOperand.pop();

temp = (Node*) malloc(sizeof(Node));
temp->key = &op;
temp->left = left;
temp->right = right;
stackOperand.push(temp);
}

void evaluate(char* infix)
{
int sign = 1, decimal, length;
char variable[20];
bool readyForUnaryOperator = true;
Node* temp;

stackOperator.push('(');
while(*infix != '\0')
{
cout << *infix << endl;
while(isspace(*infix)) infix++;
if(ischar(*infix))
{
//Get number or variable
length = 0;
do
{
variable[length++] = *infix;
infix++;
}
while (ischar(*infix));

variable[length] = '\0';

temp = (Node*) malloc(sizeof(Node)); temp->key = ecvt(atof(variable), strlen(variable), &decimal, &sign);
cout << "variable: " << temp->key << endl;
temp->left = NULL;
temp->right = NULL;
stackOperand.push(temp);
cout << "VAR " << variable << endl;
sign = 1;
readyForUnaryOperator = false;
infix--;
}
else if(*infix == '(')
{
stackOperator.push('(');
readyForUnaryOperator = true;
}
else if(*infix == ')')
{
while(stackOperator.top() != '(')
{
cout << stackOperator.top() << endl;
calculate();
}
stackOperator.pop();
readyForUnaryOperator = false;
}
else if(*infix == '*' || *infix == '/')
{
if(stackOperator.top() == '*' || stackOperator.top() == '/')
calculate();
stackOperator.push(*infix);
readyForUnaryOperator = true;
}
else
{
if(readyForUnaryOperator)
{
if(*infix == '-') sign = -sign;
}
else
{
if(stackOperator.top() != '(')
calculate();
stackOperator.push(*infix);
}
readyForUnaryOperator = true;
}
infix++;
}
while(stackOperator.top() != '(')
calculate();
}

void inorder(Node* root)
{
//Print the tree in inorder form
if(root == NULL)
{
return;
}
inorder(root->left);
cout << *(root->key) << endl;
inorder(root->right);
}

Re: Stack problem?

Rage10-Jul-02 5:20

Rage

10-Jul-02 5:20

geeee ... Do remember these pages are html, so watch the < and > (which are written & g t and & l t without spaces) in the includes, and always post a code between <pre> and </pre>. You´ll get 50% more chances to get an answer quickly Big Grin | :-D

~RaGE();

Re: Stack problem?

Rage10-Jul-02 5:28

Rage

10-Jul-02 5:28

Innomino wrote:
But it seems that a stack problem has raised probably because of the stack

Lol ... well guessed Poke tongue | ;-P

... I´ve tried to look into your code, but ... Could you be more specific ? Does your app crash ? When exactly ? Which line in the code you´ve posted ?

~RaGE();

ActiveX Help

Anonymous10-Jul-02 4:48

Anonymous

10-Jul-02 4:48

Hi everyone,

I'm having troubles with some "simple" activeX programming. I'm using MSVC .NET and set up a project as "Simple ATL Control" with a class of "Simple Object". I'm trying to pass a string to this exposed method from java-script or VBScript. Everytime I try to see what the string they passed was, I get only the first char of the string and nothing more. I think I've tried just about everything (except the right thing, obviously). Here's the code :

[source]
// IDL bs
[id(1), helpstring("method ClientWrite")] HRESULT ClientWrite([in] VARIANT report_name, [out,retval] BYTE * bSuccess);

// Later in the same header file
STDMETHOD(ClientWrite)(VARIANT report_name, BYTE * bSuccess);

// Implementation
STDMETHODIMP CATS::ClientWrite(VARIANT report_name, BYTE * bSuccess){
::MessageBox(NULL, (LPCSTR)report_name.bstrVal, (char *) report_name.byref, MB_OK);
return S_OK;
}
[/source]

Why only 1 char? The implemenation code looks a little not uniformed cause I've been messing with it trying to get it to work. Any help is appreciated. Thanks.

Got It!

Anonymous10-Jul-02 6:32

Anonymous

10-Jul-02 6:32

FREAKIN' UNICODE!!!!! BSTR is 16-bits wide....... I suck!

Refernce :
::MessageBoxExW(NULL, report_name, report_name, MB_OK, NULL);
works.

Database Problem

BHBAD10-Jul-02 4:24

BHBAD

10-Jul-02 4:24

Hello all, I am having a bit of a problem with databases. Right now I have an application that stores data into an access database. But when the database goes over 2 gigs the application crashes out and it starts over writting the header file. Please give me some suggestions with using other database collectors, that would be a great help. Thanks Smile | :)

Re: Database Problem

Martin Ziacek10-Jul-02 4:31

Martin Ziacek

10-Jul-02 4:31

Yes, that's correct, because maximum size of the Access database is 2 gigabytes minus the space needed for system objects. Switch to MS SQL Server.

Re: Database Problem

BHBAD10-Jul-02 4:36

BHBAD

10-Jul-02 4:36

Martin,
I do not want it to reside on a server i need it to be independant.

Re: Database Problem

Martin Ziacek10-Jul-02 4:44

Martin Ziacek

10-Jul-02 4:44

OK, but you will not get more than 2G data into the Access database. MSDE could be a solution for you, however, check the limits first. I do not know it, I tried MSDE once and it was not good enough for me (it does not support multiple user access very well).

Re: Database Problem

Mike Nordell11-Jul-02 1:40

Mike Nordell

11-Jul-02 1:40

Martin Ziacek wrote:
Switch to MS SQL Server.

Why would one out of free will pay quite a lot of money for something that is also available freely?

If you need an SQL server, maybe Firebird could be something to have a look at.

Re: Database Problem

Martin Ziacek11-Jul-02 8:18

Martin Ziacek

11-Jul-02 8:18

Mike Nordell wrote:
maybe Firebird could be something

Well, maybe, at least it has got well documented bugs like ORDER BY has no effect. But, frankly, I am not interested in discussion about better or worse products. If you dislike MS SQL Server, do not use it and recommend something else, and obviously you have to know why you do that. I suggested MS SQL Server, because e.g. it supports import of the MS Access database. Is there the same feature in Firebird? I guess there is no such a thing. And what would be the cost of the development and maintenance of the database with Firebird? You have to understand that there are more requirements than just price of a piece of software.

Re: Database Problem

Christian Graus10-Jul-02 4:36

Christian Graus

10-Jul-02 4:36

What OS ? Windows 95/98 have a 2 gig file limit AFAIK.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Re: Database Problem

BHBAD10-Jul-02 4:39

BHBAD

10-Jul-02 4:39

Jamie,
The OS is both Win 98 and Win 2000. I need to find the optimal database application that does not reside on a server and is independat like Access. Do you know of any out there?

Re: Database Problem

Carlos Antollini10-Jul-02 4:57

Carlos Antollini

10-Jul-02 4:57

MySQL...

Go to www.mysql.com
Regards

Carlos Antollini.
Sonork ID 100.10529 cantollini

Re: Database Problem

Michael P Butler10-Jul-02 4:38

Michael P Butler

10-Jul-02 4:38

Have a look at MSDE, Microsoft's cut down version of SQL Server 2000. I'm not sure on it's maximum specs but it is a lot cheaper than investing in the full version SQL Server.

You'll find details about it on the Microsoft web-site.

Michael Smile | :)

Look, try and use your intelligence, man, even if you are a politician. - The Doctor

Re: Database Problem

Brian Azzopardi10-Jul-02 4:50

Brian Azzopardi

10-Jul-02 4:50

MSDE is limited to 2GB too. clickety

Is mysql an option?

bibamus, edamus, cras moriemur [eat, drink, for tomorrow we die]

Re: Database Problem

Matt Gullett10-Jul-02 4:47

Matt Gullett

10-Jul-02 4:47

As far as stand-alone databases MS Access is probably you're best bet. Unfortunantely, there is a 2gb limit.

One idea: split the DB into multiple MDB files and LINK the tables into a master database. Basically with this configuration you can still have a single view of the DB but have the data from the various tables spread out. This will not work, though, if you have 1 table that exceeds your 2gb limit.

Another idea: most access databases are not designed well (I'm not saying yours is poorly designed, just that this is what i've seen.) You should look at the size of the columns in your tables and see if they can be shrunk. Many DB's I've seen use the default size for text columns which is 50 characters. Often this leaves alot of unused space. Also, look for redundant data and consider normalizing the database a little. (Normalizing has the unfortunante side effect of causing you to modify your code, though.)

PM_QS_PAINT question.

Michael Liu10-Jul-02 3:54

Michael Liu

10-Jul-02 3:54

In Platform SDK of MSDN, about PeekMessage function: it says we can use PM_QS_PAINT or some other values to specify that only certain message should be processed. But when I use this value, I got complie error:'PM_QS_PAINT' : undeclared identifier. I'm sure I include Windows.h.

The other problem I got is I can use SetForegroundWindow()function, but not AllowSetForegroundWindow()function in the same file. I got compile warning:'AllowSetForegroundWindow' undefined.

Anyone knows how to fix those. Thx.

mIchAel Liu

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