C / C++ / MFC Discussion Boards

Re: Really Urgent (Function to get the size of a file)

C^hris L^osinger11-Oct-05 7:18

C^hris L^osinger

11-Oct-05 7:18

try GetFileSize

Cleek | Image Toolkits | Thumbnail maker

Re: Really Urgent (Function to get the size of a file)

REU11-Oct-05 7:28

REU

11-Oct-05 7:28

how can I get the Handle
to the file

is the first param in the GetFileSize function

can you help me

Re: Really Urgent (Function to get the size of a file)

REU11-Oct-05 7:42

REU

11-Oct-05 7:42

Ok I did it

thanx for your help brotha

the function GetFileSize its perfect (y)

thanx
GOD BLESS YOU

SHALOM

REU

constructor : 2 step constructor ...

Maximilien11-Oct-05 6:47

Maximilien

11-Oct-05 6:47

situation : I'm converting a C struct into a C++ class.

now, I have a function AllocateC that will allocate ( malloc ) the C struct and do some initialization operations on that newly allocated struct.

MyStruct* AllocateStruct( )
{
  MyStruct* p = malloc( ... );

  // initialize struct members.
  // ...

  /// then do something ...
  DoSomething( p );
  DoSomethingElse( p );
  return p;
}

now, if I move this into a C++ class with a constructor:

MyStruct::MyStruct()
{
 // initialize the members... 
}

The problem is with the additional initialization ( DoSomething DoSomethingElse ) I think I cannot put those into the constructor because the
object is not yet finalized ( fully constructed ).

Is there a 2 step constructor "construct" that I can use, or do I have to keep using a wrapper function to do the new and the additional init.

Thanks.

Max.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: constructor : 2 step constructor ...

Prakash Nadar11-Oct-05 7:13

Prakash Nadar

11-Oct-05 7:13

Maximilien wrote:
The problem is with the additional initialization ( DoSomething DoSomethingElse ) I think I cannot put those into the constructor because the

for non-inherited class objects when the constructor is executing, the object is completely initialised, so it is safe to do the init there, but memory allocation in the constructor is really not a great way to go, what if there is an exception during memory allocation, not a pretty way to recover.

-prakash

Great News!

Al Baraki11-Oct-05 6:01

Al Baraki

11-Oct-05 6:01

A new Java-like framework has just been released by SwingC.com.

SwingC is a great UI framework that can be used in place of MFC, or any other GUI framework. It has a java-like syntax, and works flawlessly.

Re: Great News!

Prakash Nadar11-Oct-05 6:09

Prakash Nadar

11-Oct-05 6:09

java! not my cup of coffee.

-prakash

Re: Great News!

Bob Stanneveld11-Oct-05 6:28

Bob Stanneveld

11-Oct-05 6:28

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

Blog[^]

Re: Great News!

Maximilien11-Oct-05 6:13

Maximilien

11-Oct-05 6:13

good for you.

Maximilien Lincourt
Your Head A Splode - Strong Bad

String Help

Anonymous11-Oct-05 5:59

Anonymous

11-Oct-05 5:59

1. A program that uses function strcmp to compare two strings input by the user. The program should state whether the first string is less than, equal to or greater than the second string.

2. A program that uses function strncmp to compare two strings input by the user. The program should input the number of characters to compare. The program should state whether the first string is less than, equal to or greater than the second string.

3. A program that inputs a telephone number as a string in the form (555) 555-5555. The program should use function strtok to extract the area code as a token, the first three digits of the phone number as a token, and the last four digits of the phone number as a token. The seven digits of the phone number should be concatenated into one string. Both the area code and the phone number should be printed.

Get the string from the user using
cin.getline (sentence, 80);

4. A program that inputs a line of text, tokenizes the line with function strtok and outputs the tokens in reverse order.

Please help and thanks alot Smile | :)

Re: String Help

David Crow11-Oct-05 6:06

David Crow

11-Oct-05 6:06

Anonymous wrote:
Please help...

Exactly what do you want help with? "My homework" is not an acceptable answer.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: String Help

icabod11-Oct-05 6:09

icabod

11-Oct-05 6:09

Sounds a bit like programming homework to me.
As a hint, look up information on the following (google is your friend) and you should be well on your way: strcmp, strncmp, strtok.

Re: String Help

John M. Drescher11-Oct-05 6:16

John M. Drescher

11-Oct-05 6:16

If you want any help, Post your code here. Ask questions why it is not doing what you expect. We are not here to do your homework.

John

Catch program termination

status()11-Oct-05 5:56

status()

11-Oct-05 5:56

Hello,

I want to know is it possible to catch when my c++(mfc) application is terminated (by other process or by itself), and can i retrieve the name of the process who killed my app. I need this for debug reasons.
Thanks!

Connect to Registry

Mila02511-Oct-05 4:06

Mila025

11-Oct-05 4:06

Is there any way to connect to the system registry in Windows XP Home Edition ? RegConnectRegistry doesn't work because bypasses the authentication layer - so how to get around this problem ?

Mila

Re: Connect to Registry

RadioOpa11-Oct-05 4:35

RadioOpa

11-Oct-05 4:35

Have you tried something like this:

if(::RegOpenKeyEx(HKEY_LOCAL_MACHINE,
"Software\\Example Company\\Example Program\\VersionBuilt",
0, KEY_READ, &hKey) == ERROR_SUCCESS)
{ // Get version
//dwSize = sizeof(dwValue);

DWORD nType = REG_SZ;

unsigned char pRegData[256];
DWORD nBuffLen = 256;
char* pLocation = "VersionBuilt";
RegQueryValueEx(hKey, pLocation, NULL, &nType, pRegData, &nBuffLen);
::RegCloseKey(hKey);

csVersion.Format( "%s", &pRegData[ 5]);

}

Re: Connect to Registry

Roger Stoltz11-Oct-05 5:05

Roger Stoltz

11-Oct-05 5:05

Are you really trying to connect to a registry on a remote machine running WinXP Home Edition?
If 'yes' then forget about it since the function to use is the one you mentioned, ::RegConnectRegistry, and will always fail on the Home Edition.
What you perhaps can do is write an application that acts as a server that you can connect to using sockets and develop your own protocol for reading and/or writing the registry on the remote machine.

If you are trying to read and/or write the local registry you should use ::RegOpenKeyEx or ::RegCreateKeyEx instead.

However, in either case, depending on what access rights the user have running the application that desires access to the registry, the operation might fail due to lack of access rights.

--
Roger

Unicode presentation CEdit

RadioOpa11-Oct-05 2:59

RadioOpa

11-Oct-05 2:59

I need to display the corresponding characters of certain languages in a dialogue application. How can I convert and display values like 062A, 062B etc. ( UCS2, Arabic ) into the matching characters ?

Re: Unicode presentation CEdit

RadioOpa11-Oct-05 21:17

RadioOpa

11-Oct-05 21:17

?? Nobody´s able to help ?

MultiByteToWideCHar Help?

Amit j Patil11-Oct-05 2:35

Amit j Patil

11-Oct-05 2:35

hi
i am trying MultiByteToWideChar() it returns INVALID_PARAMETER error. is any one know abt it?
here is code snippet

char * chr="hello";
TCHAR str[255];
int nLen = MultiByteToWideChar(CP_ACP, 0,chr, -1, NULL, NULL);
MultiByteToWideChar(CP_ACP, 0, chr, -1, str, nLen);

(i am trying it in eVC 3.0, WCE)
Thanks in advance

Re: MultiByteToWideCHar Help?

nm_11411-Oct-05 11:30

nm_114

11-Oct-05 11:30

try something like:

char * chr="hello";
WCHAR str[255];
int nLen = MultiByteToWideChar(CP_ACP, 0,chr, -1, str, 255);

-- or --

char * chr="hello";
WCHAR * str;
int nLen = MultiByteToWideChar(CP_ACP, 0,chr, -1, NULL, 0);
str = new WCHAR[nLen];
MultiByteToWideChar(CP_ACP, 0,chr, -1, str, nLen);
//use str...
delete[] str;

Re: MultiByteToWideCHar Help?

Amit j Patil12-Oct-05 21:05

Amit j Patil

12-Oct-05 21:05

But i want o use CP_UTF8 code page as first parameter, since i want to convert my ascii string to Japnease.
Regards
Amit

Possible CDC issue

wdhough11-Oct-05 1:43

wdhough

11-Oct-05 1:43

I have an application that draws a diagram in the form of a bitmap and then displays this in a window. There are limits placed in my code that do not allow
the CSize properties cx and cy to be set to more than 32000 in 'SetViewportExt' and 'SetWindowExt'. This limits my the amount of my diagram that i can draw, and believe it or not someone has managed to make a diagram that exceeds that would exceed the cy component of this diagram. I took these limits out in order to be able to display the whole diagram and it worked well, the CSize objects passed to the 'SetWindowExt' and 'SetViewportExt' methods had cy components that exceed 32000, in fact they were in the region of 69000. However when i doubled the size of my diagram, which is draw as a bit map, it failed. Let us be clear the parameter is was now setting the CSize object to that would be passed to the two previously mentioned methods, were 140000 (cy component) and 2000 (cx) component. The failure was that i had lines running over the top of my diagram, i spoke to someone who was previously involved this project and they told me without those limits, i was "killing the DC", sadly he couldnt tell me, anymore, it seems that there is some sort of limit?

Can anyone help me with understanding this, or perhaps offer a solution

Many thanks

Will

Diff between CFile and CStdioFile

karmendra_js11-Oct-05 1:35

karmendra_js

11-Oct-05 1:35

hi,

Can you tell me what is the Diff between CFile and CStdioFile. when to use each of these.

Thanks.

Re: Diff between CFile and CStdioFile

ThatsAlok11-Oct-05 1:46

ThatsAlok

11-Oct-05 1:46

karmendra_js wrote:
Can you tell me what is the Diff between CFile and CStdioFile. when to use each of these.

CStdioFile is derived class on CFile.. so all CStdioFile has all capibility that CFile have plus It's special file reading Function like ReadString():- which read one line at a time etc.

karmendra_js wrote:
when to use each of these.

CStdioFile is benificial when you are using it with text based file.

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

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

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