C / C++ / MFC Discussion Boards

Rajveer8-Apr-02 6:50

8-Apr-02 6:50

I want to use the debugger to check if my arrays are filled correctly.
I have two arrays,
double xcoord1[80];
CPoint coord[80];

When I debug, I place my breakpoint right after I fill these arrays (still in the same function). Then I bring up the "Watch" debug window. But when I type xcoord1 under the name, i get the message: error in OMF type information.
And when I type coord, I get this under value: 0x0066f288

Why is all this happening?? And I know my array's have filled up properly, because if I put them to an oufile, I see that all the numbers I want are there. But why can't I view them with the debugger???

Re: Looking at arrays with Debugger

Tim Deveaux8-Apr-02 7:42

Tim Deveaux

8-Apr-02 7:42

There's an article relating to some old versions of VC in MSDN that might help - I've never seen this problem myself:

"FIX: CXX0033 Error in OMF Type from Forward Class Declaration"

Seems to be a problem with the program database file when fwd decls used. What version of VC are you using?

Re: Looking at arrays with Debugger

Rajveer8-Apr-02 8:16

Rajveer

8-Apr-02 8:16

I'm using Version 6.0

Re: Looking at arrays with Debugger

Derek Waters8-Apr-02 13:48

Derek Waters

8-Apr-02 13:48

I don't know about the error in OMF type information thing, but the second value is correct.

When you declare CPoint coord[80], coord actually becomes a (CPoint *) pointing to a block of 80 CPoint values. Therefore, when you view coord, it will display the address of the start of this memory block. There are two ways to look at the values in this array:

Add coord[0] or coord[53] to the Watch window to look at individual elements of this array, or copy 0x0066f288 to the Memory Debug window and look at the raw memory bytes (not so easy!).

Hope this helps.

------------------------
Derek Waters
derek@lj-oz.com

Re: Looking at arrays with Debugger

Roger Allen9-Apr-02 1:30

Roger Allen

9-Apr-02 1:30

You should be able to enter xcoord1,80 in the watch window to see all 80 elements of your array. Assuming you have managed to clear the OMF error problem.

I would recommend getting the book Debugging applications by John Robbins which gives lots of hints etc on how to get he most from your code and the IDE debugger.

Roger Allen
Sonork 100.10016

If I'm not breathing, I'm either dead or holding my breath.
A fool jabbers, while a wise man listens. But is he so wise to listen to the fool?

Creating CListCtrl with API

User 66588-Apr-02 6:47

User 6658

8-Apr-02 6:47

Hi
I'm currently working on a DLL in pure Win32API, i.e. with no MFC support.
Now I have one question:

I need to create a ListBox with multiple columns (like MFCs CListCtrl).
Is this possible in Win32 API?
With CreateWindow() I can create a simple ListBox (like MFCs CListBox), however it does not support multiple columns Confused | :confused:

How can I create such a ListCtrl?

regards

modified 12-Sep-18 21:01pm.

Re: Creating CListCtrl with API

alex.barylski8-Apr-02 7:19

alex.barylski

8-Apr-02 7:19

The listctrl is part of the common contrls library so you must include the standard inclusion file commctrl.h.

Also make sure the common controls lib in linked into your program. comctl32.lib

Allpcaitions that use common controls (SDK) must call InitCommonControlsEx() before using any common control.

In your case:

INITCOMMONCONTROLSEX cc;

cc.dwSize = sizeof(INITCOMMONCONTROLSEX);
cc.dwICC = ICC_LISTVIEW_CLASSES;
InitCommonControlsEx(&cc);

Common controls are created like built in "BUTTON" or "EDIT" windows.

Using List View Controls - Under your help files

// Create the list view window. 
hwndLV = CreateWindow(WC_LISTVIEW, "", 
WS_CHILD | VS_REPORT | LVS_EDITLABELS, 0, 0, CW_USEDEFAULT, CW_USEDEFAULT, hwndParent, NULL, g_hinst, NULL);

Cheers!

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

creating an atribute from a managed class

Ignacio Varas8-Apr-02 6:35

Ignacio Varas

8-Apr-02 6:35

hi, i need create an atribute from a managed cv++ class in a unmanaged vc++ class.

Anyone knows why?

thanks in advance.

Salamanca 2002 Capital Cultural Europea, Visitala

Template Overloading problem

8-Apr-02 5:49

Hello Friends,

In fact I do not know that template definition must be made inside the class. Is it really necessary?.

But, unfortunately I have encountered much more difficult problem with other template functions as described below.

I have five overloaded functions in a class as shown below:

template <typename r,="" class="" c,="" typename="" t1="">
RPC::ParamList runMethod(RPCServer &instance, R (C::*methodPtr)(T1)
, const RPC::ParamList ¶ms)
{
RPC::ParamList results;
zinc_assert(params.size( ) == 1);

// Convert params
T1 arg1;
zinc_assert(params[0].type == RPC::typeOf(arg1));
fromString(arg1, params[0].value);

// Invoke method
C *cl = dynamic_cast<c *=""> (&instance);
zinc_assert(cl);
R result = (cl->*methodPtr)(arg1);

// Package results
RPC::Parameter r;
r.type = RPC::typeOf(result);
r.value = ::toString(result);
results.push_back(r);

return results;
}

template <typename r,="" class="" c,="" typename="" t1,="" t2="">
RPC::ParamList runMethod(RPCServer &instance, R (C::*methodPtr)(T1, T2)
, const RPC::ParamList ¶ms)
{
RPC::ParamList results;
zinc_assert(params.size( ) == 2);

// Convert params
T1 arg1;
zinc_assert(params[0]->type == RPC::typeOf(arg1));
::fromString(arg1, params[0]->value);
T2 arg2;
zinc_assert(params[1]->type == RPC::typeOf(arg2));
::fromString(arg2, params[1]->value);

// Invoke method
C *cl = dynamic_cast<c *=""> (&instance);
zinc_assert(cl);
R result = (cl->*methodPtr)(arg1, arg2);

// Package results
RPC::Parameter *r = new RPC::Parameter;
r->type = RPC::typeOf(result);
r->value = ::toString(result);
results.push_back(r);

return results;
}

// Partial template function overload for vector argument
template <typename r,="" class="" c,="" typename="" t1="">
RPC::ParamList runMethod(RPCServer &instance
, R (C::*methodPtr)(vector<t1>)
, const RPC::ParamList ¶ms
)

{
RPC::ParamList results;

vector<t1> arg1;
{ // Convert params
zinc_assert(params[0]->type == RPC::ARRAY);
int stated_size;
::fromString(stated_size, params[0]->value);
zinc_assert(params.size( ) == stated_size + 1);
T1 t;
int i;
for (i = 1; i < stated_size + 1; ++i) {
zinc_assert(params[i]->type == RPC::typeOf(t));
::fromString(t, params[i]->value);
arg1.push_back(t);
}
}

// Invoke method
C *cl = dynamic_cast<c *=""> (&instance);
zinc_assert(cl);
R result = (cl->*methodPtr)(arg1);

// Package results
RPC::Parameter *r = new RPC::Parameter;
r->type = RPC::typeOf(result);
r->value = ::toString(result);
results.push_back(r);

return results;
}
// Partial template functin overload for vector result

template <typename r,="" class="" c,="" typename="" t1="">
RPC::ParamList runMethod(RPCServer &instance
, vector<r> (C::*methodPtr)(T1)
, const RPC::ParamList ¶ms
)
{
RPC::ParamList results;
zinc_assert(params.size( ) == 1);

// Convert params
T1 arg1;
zinc_assert(params[0]->type == RPC::typeOf(arg1));
::fromString(arg1, params[0]->value);

// Invoke method
C *cl = dynamic_cast<c *=""> (&instance);
zinc_assert(cl);
vector<r> result = (cl->*methodPtr)(arg1);

{ // Package results
RPC::Parameter *r = new RPC::Parameter;
r->type = RPC::ARRAY;
r->value = ::toString(result.size( ));
results.push_back(r);
vector<r>::iterator i = result.begin( );
vector<r>::iterator n = result.end( );
for (; i != n; ++i) {
r = new RPC::Parameter;
r->type = RPC::typeOf(*i);
r->value = ::toString(*i);
results.push_back(r);
}
}

return results;
}

// Partial template functin overload for vector argument & result

template <typename r,="" class="" c,="" typename="" t1,="" t2="">
RPC::ParamList runMethod(RPCServer &instance
, vector<r> (C::*methodPtr)(const vector<t1> &, const vector<t2> &)
, const RPC::ParamList ¶ms)

{
RPC::ParamList results;

vector<t1> arg1;
{ // Convert params
zinc_assert(params[0]->type == RPC::ARRAY);
unsigned int stated_size;
::fromString(stated_size, params[0]->value);
zinc_assert(params.size( ) > stated_size + 1);
T1 t;
unsigned int i;
for (i = 1; i < stated_size + 1; ++i) {
zinc_assert(params[i]->type == RPC::typeOf(t));
::fromString(t, params[i]->value);
arg1.push_back(t);
}
}

unsigned int arg2Idx;
::fromString(arg2Idx, params[0]->value);
arg2Idx += 1;
vector<t2> arg2;
{ // Convert params
zinc_assert(params[arg2Idx]->type == RPC::ARRAY);
unsigned int stated_size;
::fromString(stated_size, params[arg2Idx]->value);
zinc_assert(params.size( ) > stated_size + 1);
T2 t;
unsigned int i;
for (i = arg2Idx + 1; i < stated_size + arg2Idx + 1; ++i) {
zinc_assert(params[i]->type == RPC::typeOf(t));
::fromString(t, params[i]->value);
arg2.push_back(t);
}
}

// Invoke method
C *cl = dynamic_cast<c *=""> (&instance);
zinc_assert(cl);
vector<r> result = (cl->*methodPtr)(arg1, arg2);

{ // Package results
RPC::Parameter *r = new RPC::Parameter;
r->type = RPC::ARRAY;
r->value = ::toString(result.size( ));
results.push_back(r);
vector<r>::iterator i = result.begin( );
vector<r>::iterator n = result.end( );
for (; i != n; ++i) {
r = new RPC::Parameter;
r->type = RPC::typeOf(*i);
r->value = ::toString(*i);
results.push_back(r);
}
}

return results;
}

The following function calls are not getting resolved.It says no overload is matching.

1.
result = _server->runMethod(*this, &ClassifyDimensionServer::serverSyncDVals, params );

Where vector<dvalid> serverSyncDVals(const vector<dimensionid>&, const vector<string>&)

2.result = _server->runMethod(*this,&ClassifyDimensionServer::serverAutoGenDimension, params);

where DimensionId serverAutoGenDimension(DValId, string);

If you want complete details of each and every parameter I will be able to provide. Please let me know if there is something we need to take care of in VC60.

Is the following change correct?

//DValIds result = Client::runOnServer<dvalid>
// (*_client, *this, func, dimensionIds, dvalNames);
//' VC60 does not support explicit template arguments.
//' -Sarma - 08-Apr-2002
DValIds result = Client::runOnServer
(*_client, *this, func, dimensionIds,
dvalNames,(DValId)0);
The last argument is added as dummy argument to use all template arguments in parameters.

I shall be very thankful, if you please help me in this matter.

Thanks again,
-Sarma

newbie : why doesn't this work? plz plz plz

davun8-Apr-02 5:48

davun

8-Apr-02 5:48

Hello. I am stuck on my first
external function call.

Here is a short program:

// convert string to long double
#include <iostream>
#include <math.h>
using namespace std;

int main()
{
char str1[] = "123.21";

long double _atold(const char *);

long double d = _atold(str1);

cout << d;

return 0;
}

My problem is using the _atold() library function, which is in the math.h file.
I have tried everything, and
get the link error -
unresolved external symbol "long double __cdecl _atold(char)" (?_atold@@YAOD@Z)

I would REALLY appreciate help
on this one. I could use
other methods, but I want to
get this working. Thanks

David

Re: newbie : why doesn't this work? plz plz plz

lucy8-Apr-02 5:50

lucy

8-Apr-02 5:50

do you mean the function which convert a string to a double variable? It's atof().
example:

#include <stdio.h>
#include <strlib.h>

.....
char s[10] = "123.41"; double x;
x = atol(s);
printf("%f\n", x); // "123.41 is printed
....

I didn't find any funciton defined as atold. There is atof, and atoi (to an integer) and atol (to a long value).

Re: newbie : why doesn't this work? plz plz plz

davun8-Apr-02 6:12

davun

8-Apr-02 6:12

Hi Lucy,

thanks for the reply. I am learning
from The Waite Group OOP c++
just now. They require a string
be converted to Long Double,
not float, which I thought about
doing as a short cut. But here
is a clip from my math.h file:

#define _LD_COMPLEX_DEFINED
#endif

long double __cdecl acosl(long double);
long double __cdecl asinl(long double);
long double __cdecl atanl(long double);
long double __cdecl atan2l(long double, long double);
long double __cdecl _atold(const char *);

and at the bottom is _atold().
How can I use this?

char s[7] = "123.21"; long double d;
d = _atold(s);
cout << d;

This way, I get the error, undeclared identifier (_atold).

Thanks.

Re: newbie : why doesn't this work? plz plz plz

Ernest Laurentin8-Apr-02 6:31

Ernest Laurentin

8-Apr-02 6:31

The function _atold() is defined only if you are compiling for _M_M68K (Mot. 68K)
is defined. Use atof()!

"Dirty hands lead to important discovery..." - Thomas Edison

Re: newbie : why doesn't this work? plz plz plz

davun8-Apr-02 8:34

davun

8-Apr-02 8:34

Thanks Ernest,

but can I ask, how would one
convert a string to long double?

Would I need to use atof(), then
use a static cast to ld? I would
think there is a direct method.

Thanks for your help.

David

Re: newbie : why doesn't this work? plz plz plz

lucy8-Apr-02 8:46

lucy

8-Apr-02 8:46

according to MS document, long double is equal to double. and atof() will convert a string to double. I think this is what you want for the assignment?

Re: newbie : why doesn't this work? plz plz plz

8-Apr-02 8:47

atof function does return a double value.

Try this ...

#include <stdlib.h>
#include <stdio.h>
#include <isostream.h>

using namespace std;

int main()
{
char str1[] = "123.21";

double d = atof(str1);

cout << d;

return 0;
}

Re: newbie : why doesn't this work? plz plz plz

davun8-Apr-02 9:24

davun

8-Apr-02 9:24

thanks all. Very much appreciated.

ScrollWindowEx Problem!

G.Richard8-Apr-02 5:43

G.Richard

8-Apr-02 5:43

does anyone knows how to use ScrollWindowEx?

c++ : my dream

Re: ScrollWindowEx Problem!

alex.barylski8-Apr-02 7:22

alex.barylski

8-Apr-02 7:22

Nope..no one uses ScrollWindowEx anymore... Poke tongue | ;-P

I'm afraid your going to have to be more specific than that...

Cheers

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: ScrollWindowEx Problem!

G.Richard9-Apr-02 3:36

G.Richard

9-Apr-02 3:36

I want to use the ScrollWindowEx to animate window, when scrolling.
i mean I can't use ScrollwindowEx do the same thing that scrollwindow do, if i change the last parameter to SW_SMOOTHSCROLL. it can't update the region scrolled.why not have a try? you can test the following code inyou application.

...
CRect rcClient;
GetClientRect(&rcClient);
ScrollwindowEx(100,0, &rcClient, &rcClient, NULL,NULL, SW_SMOOTHSCROLL);
...

c++ : my dream

Help with multiple classes

Xds8-Apr-02 5:32

Xds

8-Apr-02 5:32

Hi all,

This is my first post; I'm new to C++ so go easy on me.
I have two classes; and their functions include code that refer to the other:
i.e: Class X has code that uses a variable/function from Class Y and vice-versa. The classes are completely different, so it would not help to derive one off the other.

In Header.h:

------------------------------------------------------------
class X {
public:
	int  myint;
	void doit(void);
};

void X::doit(void) {
	printf("CY.myint = %i", CY.myint); // Print Class Y's myint
}


class Y {
public:
	int  myint;
	void doit(void);
};

void Y::doit(void) {
	printf("CX.myint = %i", CX.myint); // Print Class X's myint
}
------------------------------------------------------------

In Main.CPP:

------------------------------------------------------------
#include  "stdio.h"
#include "Header.h"

int main(void) {

	class X CX;
	class Y CY;

	CX.myint = 100;
	CY.myint = 200;
	CX.doit();
	CY.doit();

	return 1;

}
------------------------------------------------------------

How can I get these classes to work together?
I can't put an 'extern class Y' before the 'class X' declaration, so how can I let the compiler know that the other class exists and will be declared?

Thanks!

Mike

Re: Help with multiple classes

Rickard Andersson²⁰8-Apr-02 5:39

Rickard Andersson²⁰

8-Apr-02 5:39

Xds wrote:
int main(void)
{
class X CX;
class Y CY;

CX.myint = 100;
CY.myint = 200;

CX.doit();
CY.doit();

return 1;
}

I'm not sure about this but isn't it "wrong" to write 'class X CX'?
Isn't 'X CX' the right way!?

I can be wrong!!!!!!

------------------------------------
Rickard Andersson, Suza Computing
ICQ#: 50302279
I'm from the winter country SWEDEN!

------------------------------------

Re: Help with multiple classes

Xds8-Apr-02 5:49

Xds

8-Apr-02 5:49

Pretty sure it works either way, but in any case, that's not the problem.
Thanks!

Mike

Re: Help with multiple classes

Roger Allen8-Apr-02 6:09

Roger Allen

8-Apr-02 6:09

You need to use a forward declaration of the class.

class Y ; // forward class declaration

class X
{
 void DoIt(Y& y) ; // pass in a reference to a Y object
} ;

class Y
{
} ;

You also cannot print out the content of CY in CX unless you pass a reference / pointer / copy of the object you want to print in as a parameter. The CX in main does not know anything about the CY:

#include  "stdio.h"
#include "Header.h"
int main(void) 
{
	X CX;
	Y CY;
	CX.myint = 100;
	CY.myint = 200;
	CX.doit(CY); // see class declaration above
	CY.doit();
	return 1;
}

Roger Allen
Sonork 100.10016

If I'm not breathing, I'm either dead or holding my breath.
A fool jabbers, while a wise man listens. But is he so wise to listen to the fool?

Re: Help with multiple classes

Le centriste8-Apr-02 7:34

Le centriste

8-Apr-02 7:34

That code wont't compile because in your doit methods you reference hard-coded instances.
Michel

If I am wrong or said something stupid, I apologize in advance Wink | ;)

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