Re: how to get the size of an array - C / C++ / MFC Discussion Boards

[Message Deleted]

Ali Tavakol5-Sep-05 19:57

Ali Tavakol

5-Sep-05 19:57

[Message Deleted]

Re: icon

toxcct5-Sep-05 21:17

toxcct

5-Sep-05 21:17

i guess you are using Visual Studio 6.

you can import into your resources your 32-bits icon but won't be able to open it within VS6. VS7.1 allows you to, however...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

DirectX OverLay ?

seq-5-Sep-05 11:08

seq-

5-Sep-05 11:08

Hi,

I wonder if anyone have an idea how to make an directx overlay (or however its called). I mean something like xfire or TS has, when you run a game, and some1 sends you a message there is a small box drawn in the game from xfire. You know how to do It ? any help appreciated

Addstore() [Outlook Automation] problem

_kane_5-Sep-05 10:25

_kane_

5-Sep-05 10:25

Please check the following snippet of code where I have used
AddStore() to add a pst file to a profile. This works in some pcs
while in others it fails with "Outlook faled to add the personal store
to this session". Any ideas?

<br />
_Application olApplication;<br />
_NameSpace olNameSpace;<br />
COleException e;<br />
if(!olApplication.CreateDispatch("Outlook.Application", &e)) {<br />
CString str;<br />
str.Format("CreateDispatch() failed w/error 0x%08lx", e.m_sc);<br />
AfxMessageBox(str, MB_SETFOREGROUND);<br />
//m_bLogged = FALSE;<br />
}<br />
else {<br />
// Logon. Doesn't hurt if you are already running and logged on..<br />
<br />
olNameSpace = olApplication.GetNamespace("MAPI");<br />
COleVariant covOptional((long)DISP_E_PARAMNOTFOUND, VT_ERROR);<br />
olNameSpace2.Logon(covOptional2, covOptional2, covOptional2,<br />
covOptional2);<br />
}<br />
olNameSpace.AddStore(COleVariant(strDestinyPstPath));<br />
//strDestinyPstPath contains the path to the PST file.<br />

Thanks.

Best Regards,
kane

"Some guys hack just to get themselves a girlfriend.What a pathetic reason huh ?"

DEBUG_NEW

Klempie5-Sep-05 8:27

Klempie

5-Sep-05 8:27

Before delving into hex numbers and memory addresses, does anyone have any advice on using "#define new DEBUG_NEW" as an option in DEBUG in VS2003 Standard Edition?

I have the following switches on (/MDd, _DEBUG, /ZI) but as far as I can tell the compiler is not loading the debug library cos it comes up with the following "error C2665: 'operator new' : none of the 5 overloads can convert parameter 1 from type 'const char [71]'" in the "xmemory" file.

I assume this is because the compiler has translated the macro as a string and not a bunch of debug expressions. Is that the correct diagnosis?

What should I change in the project settings to get this to work?
TIA

PS Obviously, the point to all of this is hunting down memory allocations using "new".

Re: DEBUG_NEW

Bob Stanneveld5-Sep-05 9:41

Bob Stanneveld

5-Sep-05 9:41

Hello,

I think that you use the DEBUG_NEW macro without including the proper headers. You arn't using MFC are you? See here[^] for more details on DEBUG_NEW

The above method is very basic in detecting memory leaks. If you need good support for the leaks, I can suggest Visual Leak Detector[^] as an excellent open source tool. It worked for me in some of my projects.

Hope this helps Big Grin | :-D

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

how to get the size of an array

Waleed Eissa5-Sep-05 8:00

Waleed Eissa

5-Sep-05 8:00

hi, is there anyway in C++ that I could get the size of a simple type array?

I'm trying to pass an array to a function without passing the size of the array..

(a.k.a. Wal2k)
www.wal2k.com

Re: how to get the size of an array

C^hris L^osinger5-Sep-05 8:07

C^hris L^osinger

5-Sep-05 8:07

not in general.

if you know the arrays are always allocated with malloc, calloc or realloc, you can use _msize to get the allocated size, then divide by the type size. but that's a giant hack and is very likely to lead to disaster (ex. if someone passes an array that was created on the stack or via new)

it's best to just pass the array size, or use a dynamic container like std::vector.

Cleek | Image Toolkits | Thumbnail maker

Re: how to get the size of an array

Bob Stanneveld5-Sep-05 9:44

Bob Stanneveld

5-Sep-05 9:44

Chris Losinger wrote:
but that's a giant hack and is an very likely to lead to disaster (ex. if someone passes an array that was created on the stack or via new)

For that reason, I never could get the infamous countof to work!

// the countof macro for calculating array size
#define countof(X)    (sizeof(X) / sizeof((X)[0]))

Good to know why it doesn't work..

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Re: how to get the size of an array

Jose Lamas Rios5-Sep-05 16:33

Jose Lamas Rios

5-Sep-05 16:33

That macro only works if the compiler can see X as an array:

#define COUNT_OF(X)  (sizeof(X) / sizeof((X)[0]))
 
void DisplayNumbers(int[6] numbers);
void DisplayNumbers2(int* pNumbers);
void DisplayNumbers3(int* pNumbers, int nSize);
 
void main()
{
   int numbers[] = {1, 2, 3, 5, 8, 13};
 
   // Here it works fine
   int nSize = COUNT_OF(numbers);
 
   DisplayNumbers(numbers);
 
   DisplayNumbers2(numbers);
 
   DisplayNumbers3(numbers, nSize);
}
 
void DisplayNumbers(int[6] numbers)
{
   printf("DisplayNumbers shows:\n   ");
 
   // Here it works fine too, although it's
   // not very useful because you are already
   // stating the size is 6
   int nSize = COUNT_OF(numbers);
   for (int i = 0; i < nSize; ++i)
      printf("%d ", numbers[i]);
 
   printf("\n");
}
 
void DisplayNumbers2(int* pNumbers)
{
   printf("DisplayNumbers2 shows:\n   ");
 
   // Here it doesn't work at all, because for
   // all the compiler knows, pNumbers is just
   // a pointer to an int. Thus, sizeof(X) in
   // the macro will return 4 (i.e., the size
   // of any pointer), sizeof((X)[0]) will
   // return 4 too, and the result for COUNT_OF(X)
   // will then be 1.
   int nSize = COUNT_OF(pNumbers); // will return 1
   for (int i = 0; i < nSize; ++i)
      printf("%d ", numbers[i]);
 
   printf("\n");
}
 
void DisplayNumbers3(int* pNumbers, int nSize)
{
   printf("DisplayNumbers3 shows:\n   ");
 
   for (int i = 0; i < nSize; ++i)
      printf("%d ", numbers[i]);
 
   printf("\n");
}

The output for this program would be:

DisplayNumbers shows:
   1 2 3 5 8 13 
DisplayNumbers2 shows:
   1
DisplayNumbers3 shows:
   1 2 3 5 8 13

--
jlr
http://jlamas.blogspot.com/[^]

Re: how to get the size of an array

Jose Lamas Rios5-Sep-05 16:07

Jose Lamas Rios

5-Sep-05 16:07

Chris Losinger wrote:
it's best to just pass the array size, or use a dynamic container like std::vector.

True. Another alternative, which is used sometimes for arrays of pointers, are NULL terminated arrays.

--
jlr
http://jlamas.blogspot.com/[^]

Re: how to get the size of an array

toxcct5-Sep-05 21:20

toxcct

5-Sep-05 21:20

Waleed wrote:
is there anyway in C++ that I could get the size of a simple type array?

no, but you might know the size as you explicitely told the amount of memory needed to build it...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: how to get the size of an array

Waleed Eissa6-Sep-05 4:56

Waleed Eissa

6-Sep-05 4:56

thanks to all of you, I was thinking about using a special value to end my array as it's posted here...

Draw Icon In Combo Box

Skute5-Sep-05 5:58

Skute

5-Sep-05 5:58

Hi,

ive made a combo box which resembles MS' combo box in explorer.exe. only trouble is, when i select an item from the drop down, it doesnt display the icon next to the path. ive added the message OnDrawItem and ive tried overriding DrawItem but that didnt work. Where can i handle the message which will allow me to draw that icon?

Thanks,

Skute

Dynamic Disk

sanjaylk5-Sep-05 5:53

sanjaylk

5-Sep-05 5:53

Hi,
I have to write application to detect Disk configuration.
Is disk type is Basic or Dynamic?
I know Basic disk is supported by all windows versions, but dynamic is supported only by windows 2000, XP Pro, 2003 Server.
I am able to get the OS information but unable to get info for hard disk's.
Can anyone help me?

Thanks,
sanjay

VC6 compiler bug?

Ravi Bhavnani5-Sep-05 5:24

Ravi Bhavnani

5-Sep-05 5:24

Amazingly, this code seems to compile without errors in VC6. Are you able to repro this or am I doing something stupid?

#include "stdafx.h"
 
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
 
<code>//////////////////////////////////////
// The one and only application object</code>
CWinApp theApp;
 
void foo
  (CString str)
{
}
 
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
  <code>// Initialize MFC and print and error on failure</code>
  if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0)) {
      printf ("Fatal Error: MFC initialization failed");
      return (1);
  }
 
  unsigned int x = 1;
  foo (x);  <code>// <-- no compiler error generated</code>
  foo (1);  <code>// <-- no compiler error generated</code>
 
  return (0);
}

/ravi

My new year's resolution: 2048 x 1536
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com

Re: VC6 compiler bug?

Gary R. Wheeler5-Sep-05 5:35

Gary R. Wheeler

5-Sep-05 5:35

I would guess you are seeing an implicit constructor call, probably one of the CString(XCHAR c,int count = 1); variants.

Software Zen: delete this;

Re: VC6 compiler bug?

Ravi Bhavnani5-Sep-05 5:45

Ravi Bhavnani

5-Sep-05 5:45

Ah. I knew it had to be me. Smile | :)

/ravi

My new year's resolution: 2048 x 1536
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com

Re: VC6 compiler bug?

Gary R. Wheeler5-Sep-05 5:49

Gary R. Wheeler

5-Sep-05 5:49

VC7.0 and VC7.1 add a macro (ATL_CSTRING_EXPLICIT_CONSTRUCTORS, or something like that) to force compile errors in this case.

Software Zen: delete this;

Re: VC6 compiler bug?

Bob Stanneveld5-Sep-05 9:46

Bob Stanneveld

5-Sep-05 9:46

Hello,

I'm just curious why you define _tmain() in a MFC application?

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Re: VC6 compiler bug?

Ravi Bhavnani5-Sep-05 9:53

Ravi Bhavnani

5-Sep-05 9:53

Bob Stanneveld wrote:
why you define _tmain() in a MFC application?

It's a console MFC app (specifically, a test framework for a lib that happens to link with MFC).

/ravi

My new year's resolution: 2048 x 1536
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com

-- modified at 23:57 Monday 5th September, 2005

Help on WebBrowser

Cao Jianlin5-Sep-05 5:05

Cao Jianlin

5-Sep-05 5:05

Hi,
I use webbrowser control in a vc project,and when navigate to a local file which contains ActiveXObject .Then it blocks .
How can i let the webbrowser direct shows the contenct without user allows it.
A example of it is the Directx Sample Browser .I want just the same .
Some one please help me. Thanks

Registry Editing C++

u6ik5-Sep-05 5:03

u6ik

5-Sep-05 5:03

I seem to have a compatibility issue with functions accessing the registry. All XP systems work well but 98 and 2K seem to decide they won't play. Its common to all Reg...Ex() functions. Anyone know how to solve this cross Windows issue before I start coding everything in 16bit.

Many thanks Big Grin | :-D

<br />
bool WriteKey(char * key_type, char * key)<br />
{<br />
	bool status = true; // OK<br />
<br />
	LONG ret;<br />
<br />
	HKEY kh1, kh2;<br />
<br />
	DWORD disposition;<br />
	<br />
	char *buf1;<br />
	char *buf2;<br />
<br />
	buf1 = new char[256];<br />
	buf2 = new char[256];<br />
<br />
<br />
	// add a key for the new vendor<br />
	ret = RegCreateKeyEx(HKEY_LOCAL_MACHINE, <br />
		"SOFTWARE\\KEY1", <br />
		0,<br />
		NULL,<br />
		REG_OPTION_NON_VOLATILE,<br />
		KEY_ALL_ACCESS,<br />
		NULL,<br />
		&kh1,<br />
		&disposition);<br />
<br />
	// add a key for the new app<br />
	ret = RegCreateKeyEx(kh1, <br />
		"KEY2",<br />
		0,<br />
		NULL,<br />
		REG_OPTION_NON_VOLATILE,<br />
		KEY_ALL_ACCESS,<br />
		NULL,<br />
		&kh2,<br />
		&disposition);<br />
	<br />
<br />
	if(ret != ERROR_SUCCESS)<br />
	{<br />
		MsgBox("WriteKey(): RegCreateKeyEx: Failed.");<br />
		status = false;<br />
	}<br />
<br />
	// create sn<br />
	ret = RegSetValueEx(kh2, key_type,	0,	REG_SZ, (CONST BYTE *) key, strlen(key) + 1);<br />
<br />
	if(ret != ERROR_SUCCESS)<br />
	{<br />
		MsgBox("WriteKey(): RegSetValueEx: Failed.");<br />
		status = false;<br />
	}<br />
<br />
	// close the new key<br />
	ret = RegCloseKey(kh1);<br />
	ret = RegCloseKey(kh2);<br />
<br />
	if(ret != ERROR_SUCCESS)<br />
	{<br />
		MsgBox("WriteKey(): RegCloseKey: Failed.");<br />
		status = false;<br />
	}<br />
<br />
	delete buf1;<br />
	delete buf2;<br />
<br />
	return status;<br />
}<br />

u6ik

Re: Registry Editing C++

u6ik5-Sep-05 6:44

u6ik

5-Sep-05 6:44

Cracked it. Simple really...

<br />
<br />
ret = RegSetValueEx(kh2, key_type, 0, REG_SZ, (CONST BYTE *) key, strlen(key) + 1);<br />
<br />
if(ret != ERROR_SUCCESS)<br />
{<br />
ret = RegSetValue(kh2, key_type, (CONST BYTE *) key, strlen(key) + 1);<br />
}<br />

Just use the older code if the newer code fails. Bit of a faf, but it works.

Poke tongue | ;-P

u6ik

About MS Access Database in vc++:==Plz Help

parims5-Sep-05 3:13

parims

5-Sep-05 3:13

Hello.,
I developed an application which stores some data.
Next I create a setup file .
The SetUp file (If I installed in my Machine) works fine in my System, But It can not works fine in other machines.

=>Because I hard coded the DSN name as 'MyDSNName'
and Database Table as 'MyDataBase'
--
I wrote code like this.-=-->
-------------

CString sql,sDate;

CString sDriver = "MICROSOFT ACCESS DRIVER (*.mdb)";
CString sDsn;
CString sFile = "c:\\mydatabase.mdb";

CDatabase db;

sDsn.Format("ODBC;DRIVER={%s};DSN='MyDsnName';DBQ=%s",sDriver,sFile);

db.Open(NULL,false,false,sDsn);

CRecordset recset( &db);

------------
>>I want flexible code ,which works fine for all machines.,

Praveen Chowdam Kumar

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