C / C++ / MFC Discussion Boards

neha.agarwal274-Dec-07 21:27

4-Dec-07 21:27

Hi all,

I want to convert my LPCSTR value to char* how to do so.

Can anybody please help me in this.

Thanks in advance

Re: converting LPCSTR to char*

Cedric Moonen4-Dec-07 21:30

Cedric Moonen

4-Dec-07 21:30

LPCSTR is a const char pointer. Why do you want to remove the const ?
When asking a question, please be specific and tell exactly what you are trying to do. So, in which context do you want this conversion ?

Cédric Moonen
Software developer

Charting control [v1.2]

Re: converting LPCSTR to char*

CPallini4-Dec-07 21:44

CPallini

4-Dec-07 21:44

if (and only if) you have this requirement because of a bad designed function prototype (and you cannot change it, e.g. you have a third party DLL), i.e. a function that in fact doesn't change input buffer but accepts char * as argument, then you can simply cast the pointer.
Smile | :)

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-- Alfonso the Wise, 13th Century King of Castile.

Re: converting LPCSTR to char*

Don Box4-Dec-07 21:47

Don Box

4-Dec-07 21:47

Use const_cast<char*> (variable).

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Re: converting LPCSTR to char*

ThatsAlok4-Dec-07 22:16

ThatsAlok

4-Dec-07 22:16

neha.agarwal27 wrote:
I want to convert my LPCSTR value to char* how to do so.

will strcpy help?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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Re: converting LPCSTR to char*

jhwurmbach4-Dec-07 22:31

jhwurmbach

4-Dec-07 22:31

Thats wrote:
I want to convert my LPCSTR value to char* how to do so.

will strcpy help?

How could he know? Without seeing his problem clearly?
Big Grin | :-D

Let's think the unthinkable, let's do the undoable, let's prepare to grapple with the ineffable itself, and see if we may not eff it after all.
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Re: converting LPCSTR to char*

ThatsAlok4-Dec-07 23:32

ThatsAlok

4-Dec-07 23:32

Offcourse

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

Re: converting LPCSTR to char*

sarat4-Dec-07 23:19

sarat

4-Dec-07 23:19

HI...

you using unicode or muli-byte characters??

Best Regards

Re: converting LPCSTR to char*

sarat4-Dec-07 23:20

sarat

4-Dec-07 23:20

If u have compiled your program with UNICODE and _UNICODE defined, then LPTSTR will automatically become LPWSTR (Long pointer to a wide string) u cant assign this to char* but u can assign this to a variable of type wchar_t*.

after using wchar_t* use swprintf() to get proper output.

Re: converting LPCSTR to char*

Cedric Moonen4-Dec-07 23:33

Cedric Moonen

4-Dec-07 23:33

Did you read his message ? He was talking about LPCSTR and not LPTSTR.

Cédric Moonen
Software developer

Charting control [v1.2]

Re: converting LPCSTR to char*

ThatsAlok4-Dec-07 23:34

ThatsAlok

4-Dec-07 23:34

Cedric Moonen wrote:
LPTSTR.

you forget to bold T i.e. LPTSTR

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

Re: converting LPCSTR to char*

sarat4-Dec-07 23:40

sarat

4-Dec-07 23:40

ohh sorry then If you use T2A macro, it will work in UNICODE and MBCS.
please go through T2A macro

Re: converting LPCSTR to char*

Cedric Moonen5-Dec-07 0:09

Cedric Moonen

5-Dec-07 0:09

Why would it be usefull to use the T2A macro ? A LPCSTR is a const char*.
I think you should read some documentation about the different string types to better understand the different namings.

Cédric Moonen
Software developer

Charting control [v1.2]

Re: converting LPCSTR to char*

sarat5-Dec-07 0:21

sarat

5-Dec-07 0:21

correct
then why she wants to do that?

Re: converting LPCSTR to char*

Cedric Moonen5-Dec-07 0:52

Cedric Moonen

5-Dec-07 0:52

Probably because the compiler complains about the constness.

Cédric Moonen
Software developer

Charting control [v1.2]

Re: converting LPCSTR to char*

sarat5-Dec-07 1:58

sarat

5-Dec-07 1:58

neha
can u mention what exactly u wanna do and where u r facing problem
eplain the scenario

how to set transparent color for a perticular color

sarat4-Dec-07 21:01

sarat

4-Dec-07 21:01

hi i need to set transparent color for a perticular color so that when i load bit map the color will be transparent...

i am working with mfc tool bar controls

how to set default transparent color for a perticular color
please let me know

thanks in advance

Re: how to set transparent color for a perticular color

Cedric Moonen4-Dec-07 21:13

Cedric Moonen

4-Dec-07 21:13

What are you doing exactly ? Where are you using that bitmap and how do you 'display' it ?

Cédric Moonen
Software developer

Charting control [v1.2]

Re: how to set transparent color for a perticular color

sarat4-Dec-07 21:42

sarat

4-Dec-07 21:42

thanx for the reply

i have a bit map lets say smily having red color arrond the smily
i wanna put that bit map on the tool bar button
but i dont wanna disply the red color
i know we can make that red color as transparent color so that it wont be displyed ... but how to set red color as transparent color

Re: how to set transparent color for a perticular color

GauranG Shah5-Dec-07 0:43

GauranG Shah

5-Dec-07 0:43

use SetlayeredWindowAttributes() API to set the red color transparent.

might be below link will help you.
http://www.codeproject.com/KB/cpp/Greetings.aspx[^]

[ Screen Capture ][ Tool Tip ][ Muliple Desktops ][Greeting Card ]

Re: how to set transparent color for a perticular color

Mark Salsbery5-Dec-07 5:57

Mark Salsbery

5-Dec-07 5:57

For button bitmaps in an MFC toolbar, you can use a masked
imagelist to hold the bitmaps.

    // in constructor
    // transparent color is bright green
    m_ToolBarImageList.Create(IDB_BITMAP1, 16, 1, RGB(0x00,0xFF,0x00));
...
    // some time after m_ToolBar's is created
    m_ToolBar.GetToolBarCtrl().SetImageList(&m_ToolBarImageList);

Mark Salsbery
Microsoft MVP - Visual C++

Java | [Coffee]

Re: how to set transparent color for a perticular color

sarat5-Dec-07 19:59

sarat

5-Dec-07 19:59

Thanx a lot it works fine

Message Mapping Problem

Md. Mazharul Islam Khan4-Dec-07 20:57

Md. Mazharul Islam Khan

4-Dec-07 20:57

I wrote a class CCamCtrl. I use a Custom message WM_CAPTURE_IMAGE and used message mapping. A dll is to post message. I think dll does not post messsage, sothat OnCaptureData(WPARAM wParam, LPARAM lParam ) event can't be called.

Are there any problem in my code or in dll.

here i mention that dll works well for dialog based application.
Can anyone help me?

Thanks in Advance
Mazhar

header file
class CCamCtrl : public COleControl
{
//some code
///
///

// Message maps
//{{AFX_MSG(CCamCtrl)
afx_msg void OnCaptureData(WPARAM wParam, LPARAM lParam );
afx_msg void OnShowWindow(BOOL bShow, UINT nStatus);
afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
afx_msg void OnTimer(UINT nIDEvent);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

in cpp i wrote
BEGIN_MESSAGE_MAP(CCamCtrl, COleControl)
//{{AFX_MSG_MAP(CCamCtrl)
ON_MESSAGE(WM_CAPTURE_IMAGE,OnCaptureData)
ON_WM_SHOWWINDOW()
ON_WM_LBUTTONDOWN()
ON_WM_TIMER()
//}}AFX_MSG_MAP

ON_MESSAGE(OCM_COMMAND, OnOcmCommand)
ON_OLEVERB(AFX_IDS_VERB_PROPERTIES, OnProperties)

END_MESSAGE_MAP()

VM Size

Programm3r4-Dec-07 20:23

Programm3r

4-Dec-07 20:23

Hi all,

I would like to know in general what causes a large amount of virtual memory to be used when creating an application. I.E What within the application causes a large amount of virtual memory to be used.

Thanks in advance
Regards,

The only programmers that are better that C programmers are those who code in 1's and 0's Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: VM Size

baerten4-Dec-07 21:11

baerten

4-Dec-07 21:11

If you create a lot of classes with'in huge memory allocation. And you don't release it.
Or if bitmaps are loaded.

I sawed already that the visual studio debugger don't frees the memory at realtime.
If you create a view, close it, create, close, ...
then you get not the initial memory size of your application

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