C / C++ / MFC Discussion Boards

BlackDice25-Aug-04 7:43

25-Aug-04 7:43

i don't know if this is it, but does your application need to call AfxOleInit()?

[insert witty comment here]

bdiamond Sleepy | :zzz:

Re: Problem using RichTextBox

David Crow25-Aug-04 10:21

David Crow

25-Aug-04 10:21

SuperTank wrote:
Anyone got any idea whats wrong?

How about calling GetLastError()?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Problem using RichTextBox

SuperTank25-Aug-04 10:40

SuperTank

25-Aug-04 10:40

I acctualy got it working. All I had to do was to add LoadLibrary("Riched20.DLL");

It seams to be very common fault.

humpa humpa

Deriving from a CStatic

act_x25-Aug-04 6:01

act_x

25-Aug-04 6:01

I am deriving from CStatic class to create a CStatic with customized font and coloration .

But my problem is that during creation how do I and where do specify the Font to be used ?

Re: Deriving from a CStatic

Michael P Butler25-Aug-04 6:28

Michael P Butler

25-Aug-04 6:28

Have a look at CLabel - An extended use of CStatic[^]

Michael

CP Blog [^]

Re: Deriving from a CStatic

Maximilien25-Aug-04 6:33

Maximilien

25-Aug-04 6:33

you can create the font in the constructor; you might need to override the Paint method.

Maximilien Lincourt
Your Head A Splode - Strong Bad

General Pointer to Variables

sweep12325-Aug-04 5:49

sweep123

25-Aug-04 5:49

Is it possible to declare a series of variables and then assign a pointer to the start (i.e. the first variable).
I wish to use a user defined database which will hold the display format, type and an offset into the variables location in memory.

Basically I will fill an array of item details and declare the items;

e.g.

static ITEM_DETAILS items[NO_ITEMS] = {<br />
   "%0.2f",   display format<br />
   "float"  // type<br />
   "£",   // Units<br />
  "Current Cost"   // Title of the item<br />
  , "0000"   // Memory offset<br />
<br />
   "%d",   display format<br />
   "unsigned short"  // type<br />
   "N/A",   // Units<br />
  "Number of Units",   // Title of the item<br />
  "0004"   // Memory offset 4 as its a float' 2 for short etc<br />
<br />
  etc<br />
 };

Now the items will be declared as follows:-

float cost;   // Item cost<br />
unsigned short noOfItems;   // No off<br />
CString itemName;   // Name<br />
etc

Now my question is how do I go about declaring a pointer to the first variable (start of the memory that the variables are held) and is it OK to add offsets to this pointer, i.e. to obtain data item2 (noOfItems which has the offset 0004)

e.g.
LPVOID ptr = &cost; // Pointer to the start of the memory location

so to access the item noOfItems I would do the following:-

int offset = atoi(items[1].offset);  // 2nd item<br />
data = *(ptr + offset);   // i.e. *(ptr + 0004);

I need the variables in contagious memory and is a LPVOID the right choice.

I was thinking of shared memory, but I have always used a structure to access items and not a general pointer.

Any help please.

Re: General Pointer to Variables

jmkhael25-Aug-04 5:56

jmkhael

25-Aug-04 5:56

Check the macro offsetof, it would be what you need

It is used along with a structure.

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: General Pointer to Variables

sweep12326-Aug-04 2:17

sweep123

26-Aug-04 2:17

Thanks for the info, however I have a problem with the bit fields (I know that you cant use the macro with these fields) but its the extra byte thats the problem, as I could just manage the field fileds aa a 2 byte hex item.

#pragma pack(1)<br />
typedef struct<br />
{<br />
     unsigned short  i;  <br />
     float  f;  <br />
     char  c; <br />
	 unsigned short bit41 : 4;<br />
	 unsigned short bit42 : 2;<br />
	 unsigned short bit43 : 1;<br />
	 char s;<br />
	 unsigned short x;<br />
	 double y;<br />
	 double z;<br />
} SFOO;<br />
<br />
union<br />
{<br />
	SFOO				fields;<br />
	unsigned short		buffer[32];<br />
}test_data;<br />
<br />
#pragma pack()<br />
<br />
void main(void)<br />
{<br />
  printf("Offset of 'c' is %u  ", offsetof(SFOO, c));<br />
  printf("Offset of 's' is %u  ", offsetof(SFOO, s));

This gives Offset of 'c' is 6 Offset of 's' is 9; I was expecting 8, see below:-

f f i i
Bits c f f
x x s
y y y y
y y y y
z z z z
z z z z

Re: General Pointer to Variables

sweep12326-Aug-04 5:35

sweep123

26-Aug-04 5:35

The bit fields gave me a problem with the offsetof.

See new post

http://www.codeproject.com/script/comments/forums.asp?forumid=1647&select=908749

Re: CRecordset Record Updating(Debug Assertion Failure) problem

David Crow25-Aug-04 5:47

David Crow

25-Aug-04 5:47

raed wrote:
BOOL b = dbRecord.CanUpdate();//here Debug assertion failure rasied ,WHY?

I don't know, you tell us. You should have been presented with a message box containing the file name and line number of the failed assertion. Given those two, we might be of more help.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: CRecordset Record Updating(Debug Assertion Failure) problem

raed25-Aug-04 5:55

raed

25-Aug-04 5:55

Dear:
the message box information that appear will assertion failure occured

Debug Assertion failure
....
File: f:\vs70builds\9466\vc\MFCATL\ship\atlmfc\include\afxdb.inl
Line: 58
....
....

thats all

Regards

Re: CRecordset Record Updating(Debug Assertion Failure) problem

jmkhael25-Aug-04 5:59

jmkhael

25-Aug-04 5:59

The CRecordset::CanUpdate asserts on this and If the recordset is open, and since u didnt open it it gave u the assertion, thus my suggestion to Check CRecordset::Open

afxdb.inl:
----------
ASSERT_VALID(this);
ASSERT(IsOpen());

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: CRecordset Record Updating(Debug Assertion Failure) problem

raed25-Aug-04 20:38

raed

25-Aug-04 20:38

ok,i check IsOpen() for recordset and return that the recordset is not Open , but when i open the record set like this:

CDatabase database;
database.OpenEx("DSN=HomeDSN;uid=sa;pwd=");
CRecordset record(&database);
record.Open(AFX_DB_USE_DEFAULT_TYPE,"SELECT * FROM Clients",CRecordset::none);

...
..
it works fine

but when do this:-

record.Open(AFX_DB_USE_DEFAULT_TYPE,"UPDATE Clients SET ClientName = 'Sam' WHERE ClientID ='00014'",CRecordset::none);//Assertion occured

WHY?

Thanks

how to move the event handler from main view

hyling25-Aug-04 5:43

hyling

25-Aug-04 5:43

Hi,

I've got a single document application that has a CFormView for the main window, then inside the CFormView I have a CTabControl that uses a custom CDialog class for each tab. I would like to move the event handling from the main CFormView class to the CDialog class for each tab. When I add a event handler to the dialog class it never gets called. Is this how you would code a tab control and why doesn't this work?

Thanks
Hua-Ying

INI Files

si_6925-Aug-04 5:30

si_69

25-Aug-04 5:30

Hi All

i have an application in which i use a ini file to store settings,
the user reads and writes to it

i use WritePrivateProfileString to write to the ini file
and GetPrivateProfileString to read from it

my problem is, is a lot of people who use my application do not
have admin rights..so cant write back to to the ini file

does anyone know a way round this ??

ive thought about using the registry, HKEY LOCAL MACHINE you need admin
rights for
I cant use HKEY CURRENT USER as there may be many users using my app
all who share the same settings,

Any one any ideas ???? Confused | :confused:

ta

si

Re: INI Files

David Crow25-Aug-04 5:45

David Crow

25-Aug-04 5:45

si_69 wrote:
a lot of people who use my application do not
have admin rights..so cant write back to to the ini file

In what folder does the .ini file reside?

si_69 wrote:
I cant use HKEY CURRENT USER as there may be many users using my app
all who share the same settings,

That's what that hive is for. If three people use the same machine, they each need their own settings saved to the HKCU hive. If there are settings that need to be in effect regardless of who is using the machine, then those go in the HKLM hive.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: INI Files

si_6925-Aug-04 22:40

si_69

25-Aug-04 22:40

DavidCrow wrote:
In what folder does the .ini file reside?

its stored in the application folder off program files

c:\program files\myapp

does that make a difference ?

DavidCrow wrote:
If there are settings that need to be in effect regardless of who is using the machine, then those go in the HKLM hive

the problem with that is you cant write back to HKLM in non administative mode and the
user doesnt have adminostrator rights

Re: INI Files

David Crow26-Aug-04 3:01

David Crow

26-Aug-04 3:01

si_69 wrote:
its stored in the application folder off program files

c:\program files\myapp

does that make a difference ?

Only if the user of the application does not have 'write' access to that folder, which they probably shouldn't. In reality, the INI file(s) should be stored in the C:\Documents and Settings\<username> folder, or a subfolder thereof. This is a folder that users will have 'write' access to.

si_69 wrote:
the problem with that is you cant write back to HKLM in non administative mode and the
user doesnt have adminostrator rights

Normally there's no need. When I install the software on a PC, I do so as the domain administrator so that application-wide settings are stored in the HKLM hive of the registry. When I configure the software, I do so as the person that will eventually be using it so that user-specific settings are stored in the HKCU hive. Make sense?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

WinSock2

Micie25-Aug-04 5:20

Micie

25-Aug-04 5:20

I need a VERY GOOD tutorial with many examples of ws2 use.
Post links here, plz. Roll eyes | :rolleyes:

I read several, but most of them sux. Authors only showing struct and use of the functions. I know what is doing accept() func, but I don't know why should I use it =\ the same is with bind() etc.
My problem is: I have a client of the game. I want to connect my application with this - send and recv packets.
Does any one of you know how to help me?

_________<br />
I'm made in C++... and I'm proud of it!

Re: WinSock2

Tom Wright25-Aug-04 5:33

Tom Wright

25-Aug-04 5:33

There's a really good book called "Network Programming with Windows Sockets" that taught me everything. Also with the help from tutorials on codeproject.

Tom Wright
tawright915@yahoo.com

Re: WinSock2

Micie25-Aug-04 5:36

Micie

25-Aug-04 5:36

Do u have a link to it?

_________<br />
I'm made in C++... and I'm proud of it!

Re: WinSock2

Tom Wright25-Aug-04 5:46

Tom Wright

25-Aug-04 5:46

Look on Amazon. Also take a look at Win32 Network Programming. Very good book. Can find this on Amazon.com too.

Tom Wright
tawright915@yahoo.com

Re: WinSock2

palbano25-Aug-04 19:32

palbano

25-Aug-04 19:32

http://Sockets.com[^]

Watch out! I'm a CPian on the edge!
I have a new Gold rating and I'm not afraid to use it!

-pete

AT command? ===> read sms method

Adrian Soon25-Aug-04 5:11

Adrian Soon

25-Aug-04 5:11

halo...
do anyone know wat does the it return U when U wan to use the read sms AT COMMAND?

I have no idea wat to send so I send this... to the mobile phone..
p->Send("AT+CMGL=4");

wat will I have in return.....?

wat Command should I send if I wan to know the amount of read and unread msg I have?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.