Re: CString to char - C / C++ / MFC Discussion Boards

David Crow17-Jul-06 2:48

17-Jul-06 2:48

One of the major selling points of using CString is so that new and delete won't have to be used. Some folks still continue to use/suggest them, however. Roll eyes | :rolleyes:

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Re: CString to char

Parthi_Appu17-Jul-06 3:42

Parthi_Appu

17-Jul-06 3:42

i mentioned it for char*, not for CString..
and personally i have bad experience while using CString..
so i'm avoiding CString class nowdays

Do your Duty and Don't expect the Result

Re: CString to char

David Crow17-Jul-06 4:00

David Crow

17-Jul-06 4:00

Parthi_appu wrote:
i mentioned it for char*, not for CString..

But it was in response to a post that was using CString. I was merely pointing out that new and delete are not necessary in that context.

Parthi_appu wrote:
and personally i have bad experience while using CString..
so i'm avoiding CString class nowdays

Such as? I've been using it for 13+ years and have had no complaints with it. If used incorrectly, it could very well misbehave.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Re: CString to char

Parthi_Appu17-Jul-06 16:43

Parthi_Appu

17-Jul-06 16:43

that post contains the code..
char *test;
...
test = new char[String.GetLength()+1];
....

see the post which i replied for...

CString class works badly in some times, say GetLength() returns 0 if it has some string and IsEmpty() return TRUE if it has some string..
and using CString class is not that much difficult to misuse it...

Do your Duty and Don't expect the Result

Re: CString to char

David Crow18-Jul-06 2:42

David Crow

18-Jul-06 2:42

Parthi_appu wrote:
GetLength() returns 0 if it has some string and IsEmpty() return TRUE if it has some string..

I've never seen CString::GetLength() return 0 or CString::IsEmpty() return TRUE if the object was indeed non-empty. I just don't see it happening.

Parthi_appu wrote:
CString class is not that much difficult to misuse it...

Anything for which you are not familar can be misused. With the exposure that CString has received since its incepton, to say it doesn't work in such trivial scenarios is just silly thinking.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Re: CString to char

Parthi_Appu18-Jul-06 3:14

Parthi_Appu

18-Jul-06 3:14

so u accept that i was not ask to delete the CString object..

surely CString will give problem while it was used in global thread methods...
i faced the above mentioned problems...
and also MSDN suggest to use ReleaseBuffer() after the use of GetBuffer(), i faced some memory problem when i tried to release the buffer..

and don't reply that i have to use the methods properly.. if u never face the problem then fine but i faced this problem.. for this particular reason i replaced all the CString to string in my application... and the problem is intermitent so their will be no chance of error in the code...

Do your Duty and Don't expect the Result

Re: CString to char

David Crow18-Jul-06 3:38

David Crow

18-Jul-06 3:38

Parthi_appu wrote:
so u accept that i was not ask to delete the CString object..

How would I know whether or not you were asked to delete a CString object? I'm not a mind reader.

Parthi_appu wrote:
surely CString will give problem while it was used in global thread methods...

CString does not advertise as being thread safe. To use it under that presumption is just asking for trouble.

Parthi_appu wrote:
MSDN suggest to use ReleaseBuffer() after the use of GetBuffer(), i faced some memory problem when i tried to release the buffer..

Something else was surely awry (e.g., some other method used before ReleaseBuffer() was called).

Parthi_appu wrote:
and don't reply that i have to use the methods properly..

Why would you think it is ok to use the class improperly?

Parthi_appu wrote:
...the problem is intermitent...

That alone should throw up all sorts of red flags.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Re: CString to char

Parthi_Appu25-Jul-06 1:57

Parthi_Appu

25-Jul-06 1:57

Hi David,
i was in vacation...so i didn't reply to ur post..
You mentioned that CString selling point is, it doesn't need new or delete..
and still some folks are insisting to use delete....

for this post only i replied... you didn't see the previous post that has char*... ok lets leave that...

and i didn't know CString will give problems while using thread context... i have no memory of reading this in MSDN... so if you have any link related to this, please suggest me..

Do your Duty and Don't expect the Result

Unzip.exe

see me16-Jul-06 23:36

see me

16-Jul-06 23:36

i need to run unzip command.

If there is any parameter for unzip, so that the specified folder( which doesnot existing ) for extracting the zip file is created while running the command???

Dream bigger... Do bigger...Expect smaller
aji

Re: Unzip.exe

see me17-Jul-06 1:58

see me

17-Jul-06 1:58

Hi,
Any body knows some thing about unzip command????????

Dream bigger... Do bigger...Expect smaller
aji

Re: Unzip.exe

David Crow17-Jul-06 2:50

David Crow

17-Jul-06 2:50

Read up on it:

http://www.google.com/search?hl=en&q=%22unzip.exe%22[^]

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Global hooks

Vissu8916-Jul-06 23:24

Vissu89

16-Jul-06 23:24

Hi,

I am trying to implement global hooks(as a DLL) to capture the Mouse and Windows related events happening on the desktop. I created a window and then set global hooks with the help of the following

SetWindowsHookEx( WH_CALLWNDPROC, (HOOKPROC) CallWndProc, hInst, 0);

SetWindowsHookEx( WH_GETMESSAGE, (HOOKPROC) GetMessageProc, hInst, 0);

I could Only get the Events associated with the window i created, but not the events associated with other Windows on the Desktop.

Am i missing something?
Please help me in fixing this.

Thanks,
Vissu.

Re: Global hooks

Naveen17-Jul-06 0:31

Naveen

17-Jul-06 0:31

Vissu89 wrote:
SetWindowsHookEx( WH_CALLWNDPROC, (HOOKPROC) CallWndProc, hInst, 0);

can u show me how u took the hInst in the above call?

nave

Re: Global hooks

Vissu8917-Jul-06 7:32

Vissu89

17-Jul-06 7:32

The hInstance HANDLE from DLLMAIN is stored in hinst, which is used in setting system hook

BOOL WINAPI DllMain (HANDLE hInstance, ULONG ul_reason_for_call, LPVOID lpReserved)
{
// Save the instance handle
hInst = (HINSTANCE)hInstance;
}

Thanks,
Vissu

edit box width

Ram Murali16-Jul-06 23:17

Ram Murali

16-Jul-06 23:17

hi all,
I would like to set the width of an edit box according to the no of char allowed chars.
means-> user can only enter 5 char in the edit box. So i would like to set the width of an edit box which exactly holds 5 chars(no blank space).

So how can i draw edit box which holds exactly a specified no of chars?

can anyone help in this probs?

Thanks in advance.

Regards,
Ram

Re: edit box width

see me16-Jul-06 23:32

see me

16-Jul-06 23:32

Try
BOOL MoveWindow( int x, int y, int nWidth, int nHeight, BOOL bRepaint = TRUE )
Smile | :)

Dream bigger... Do bigger...Expect smaller
aji

Re: edit box width

Parthi_Appu16-Jul-06 23:42

Parthi_Appu

16-Jul-06 23:42

You can use SetWindowPos(..),
if the editbox can have random string lengths then you have to calculate the size depending on the text selected.
if its going to be constant length then decide the size in design time itself.

An edit box can have more value than its width, if you want to restrict the string length to some constant value then setting the width won't work out

Do your Duty and Don't expect the Result

Re: edit box width

Naveen17-Jul-06 0:38

Naveen

17-Jul-06 0:38

Ram Murali wrote:
So i would like to set the width of an edit box which exactly holds 5

to calculate the rectangle required for a string to fit,use DrawText funtion with the DT_CALCRECT flag. this function will return the rectangle required by the string(Before calling this funtion don't forget to select the current edit box font to the DC). After u got the rectangle call the MoveWindow function to size the edit box.

nave

Related to edit boxes

Taruni16-Jul-06 22:41

Taruni

16-Jul-06 22:41

Hi,

I am working with edit boxes.I have declared a member variable for it with data type as "CString" .Is there any event which rises at the time when the edit box looses the focuses(for eg stating that the range is not between 100 and -100) or alternatively
I need some means to set the range for that edit box for which I have declared a variable of type "CString" . I will enter only numbers and not character type data.I will convert the entered data into integers later on.For the entered data I need to find whether it is in the range or not.

Thanks in advance

Taruni

Re: Related to edit boxes

Abhi Lahare16-Jul-06 22:55

Abhi Lahare

16-Jul-06 22:55

SubClass your Edit control.
This may help
http://www.codeproject.com/dialog/MessageHandling4.asp[^]

Regards
Abhishake Lahare

Re: Related to edit boxes

see me16-Jul-06 22:56

see me

16-Jul-06 22:56

I thing it is better to add control variable for Edit box
Instead of using CString as datatype, use CEdit.
Smile | :)

Dream bigger... Do bigger...Expect smaller
aji

Re: Related to edit boxes

Hamid_RT16-Jul-06 22:56

Hamid_RT

16-Jul-06 22:56

You can set Min value and Max value for your control(editbox)

whitesky

Re: Related to edit boxes

*Dreamz16-Jul-06 23:10

*Dreamz

16-Jul-06 23:10

Taruni wrote:
I will enter only numbers and not character type data.

Then why CString? Wink | ;)

Re: Related to edit boxes

see me16-Jul-06 23:04

see me

16-Jul-06 23:04

For that i think he need to add Control variable for the edit box instead of CString

Dream bigger... Do bigger...Expect smaller
aji

Re: Related to edit boxes

_AnsHUMAN_ 16-Jul-06 23:17

_AnsHUMAN_

16-Jul-06 23:17

The EN_CHANGE notification message is sent when the user has taken an action that may have altered text in an edit control.
Then you override the EN_CHANGE Event and write this code
// where m_editbox is a variable associated to the edit window

char *myValue=new char[m_editbox.GetWindowTextLength ()];
m_editbox.GetWindowText(myValue,strlen(myValue));
int i=0;
i=atoi(myValue);
if(i>=100 || i<=-100)
{
	AfxMessageBox("Invalid value:");
}

I hope that I understood your query correctly

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

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