C / C++ / MFC

Re: how to delete specific elements in a char pointer

11-Oct-07 4:01

sorry for the delayed post.
i was actually in a meeting.
to your problem,

Priya_Sundar wrote:
However, here i am not able to store it back to 'String'. i am getting various compiler errors like

the quickest solution is ,
for(int i=0;i less than n;i++)

{
String[i]=cString.Getat(i);//or cString[i] must also should work.
}

gud luck.

-- modified at 10:08 Thursday 11th October, 2007

Suggestion to the members:
prefix your main thread subject with [SOLVED] if it is solved.
chandu.

chandu00411-Oct-07 4:05

Re: how to delete specific elements in a char pointer

11-Oct-07 4:05

i think the topic got far diverted here.

Matthew Faithfull10-Oct-07 23:23

Matthew Faithfull

10-Oct-07 23:23

OK firstly we need to establish the meaning of 'delete' in this context. In C++ delete tends to means 'free the memory'. You certainly can't 'free the memory' currently being used by the '{' and the '}' so in C++ terms you can't 'delete' the first and last characters.
What you want is to end up with String pointing at "abcdef". You could do this with 2 lines

<br />
String++;<br />
String[6] = '\0';<br />

This will make the charatcer pointer point at the next character and then 'blank out' the end '}' (which is 6 characters on from the 'a' that String now points at) by replacing it with a NULL

There is one problem with this of course. You now have no way to free the string memory as the original value of String is lost. If your string is on the heap you will need to solve this. Enjoy.

Nothing is exactly what it seems but everything with seems can be unpicked.

Re: how to delete specific elements in a char pointer

toxcct10-Oct-07 23:33

toxcct

10-Oct-07 23:33

use a temporary buffer and use the CRT function strcpy() to copy what you want in the origin string

or if you use C++, you'd better look into the std::string STL class

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Re: how to delete specific elements in a char pointer

Priya_Sundar10-Oct-07 23:48

Priya_Sundar

10-Oct-07 23:48

i tried something like this

<br />
    ::string gidstring = String;<br />
    gidstring = gidstring.substr(1, gidstring.length() - 2);<br />

But ended up with compiler error:

"error C2039: 'string' : is not a member of '`global namespace''"

inspite of including the <string.h> header file.

how to proceed??

Priya Sundar

Re: how to delete specific elements in a char pointer

jhwurmbach11-Oct-07 0:48

jhwurmbach

11-Oct-07 0:48

why did you write ::string, thereby explicitly requesting string in the global namespace?
You probably wanted to write std::string.

Though I speak with the tongues of men and of angels, and have not money, I am become as a sounding brass, or a tinkling cymbal.
George Orwell, "Keep the Aspidistra Flying", Opening words

Re: how to delete specific elements in a char pointer [modified]

Nelek11-Oct-07 0:15

Nelek

11-Oct-07 0:15

What about...

unsigned char *srcString = "{abcdef}";
unsigned char *dstString = "";


memcpy (srcString+1, dstString, (srcString.length () - 2));

If it works you can still free the memory and delete the pointer avoiding the problem that Matthew said.
Up to that point you can work with *dstString as it was your original one.

Hope it helps

P.S. Im not sure if it works, I just asked about buffers and how to get parts of the memory two/three days ago, and this is something that I get from the answers I received.

-- modified at 6:29 Thursday 11th October, 2007

I forgot...

with the srcString + X you specify the first character you want without changing the "value" of where the pointer points.

at dsstString you can make the same leaving some intial chars unmodified adding X to his base adress

the last is the number of chars of the first string you wanna copy in the second

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Help me to understand what I'm saying, and I'll explain it better to you

Wink | ;)

How to use InvokeHelper function in C++?

PhanMinhDuy10-Oct-07 22:37

PhanMinhDuy

10-Oct-07 22:37

I want to use this function to get close event from WORD(like DoModal() in Dialog). My code like this:

---------------------------------------------------------------------------------------------
COleDispatchDriver DocProperties(pDispatch, FALSE);
_variant_t Property((long)Word::wdPropertyPages);
_variant_t Result;

DocProperties.InvokeHelper(DISPID_....,
DISPATCH_...,
VT_BSTRT,
(void*)&Result,
(BYTE*)VTS_VARIANT,
&Property);
---------------------------------------------------------------------------------------------
Is it correct idea? And what I have to input for 3 first parameters? Thank you.

[SOLVED]type specifier for UINT64

chandu00410-Oct-07 22:36

Re: type specifier for UINT64

10-Oct-07 22:36

hai,
iam using a 64 bit integer in my application.
now my problem is if i want to print its hexa value into a string, like
str.Format("%x",value);
it is printing only lsb 32 bits.
how can i achieve this using a single type specifier like %x.
how ever,
i got it solved with the following technique.
UINT64 value=0xabcdefef;
CString str;
unsigned long value1,value2;
value1=value>>32;
value2=value;
str.Format("%x%x",value1,value2);

can any body please suggest me what is the type specifier for unsigned int 64.
thanks in advance.

-- modified at 4:59 Thursday 11th October, 2007

Nelek10-Oct-07 22:51

Nelek

10-Oct-07 22:51

I am not sure about but... can it help casting the value to (_UINT64)? I mean

str.Format (_T("%x"), (UINT64) value);

Re: type specifier for UINT64

Nibu babu thomas10-Oct-07 22:52

Nibu babu thomas

10-Oct-07 22:52

It's %I64d for signed __int64 and %I64u for unsigned __int64.

See http://nibuthomas.wordpress.com/2007/06/08/print-__int64-values-using-printf/[^].

Nibu thomas
MVP For VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

[SOLVED] thanks

chandu00410-Oct-07 22:59

10-Oct-07 22:59

thanks nibu,
what i was looking for was exctly that.

hdc to Bitmap

GauranG Shah10-Oct-07 22:11

10-Oct-07 22:11

Hello friends,

I require to show the dc into the Picture Control as a bitmap.
For that I am using the code like below, but only shows blank bitmap in the Picture control.

HDC DeskDC = GetDC(NULL);
HDC hdcStatic = GetDC(hWndStatic);
HBITMAP hb = CreateCompatibleBitmap(hdcStatic,200,200);
SelectObject(hdcStatic,hb);
SetWindowLong(hWndStatic,GWL_STYLE,(GetWindowLong(hWndStatic,GWL_STYLE) & ~SS_TYPEMASK) | SS_BITMAP) ;	
BitBlt(hdcStatic,0,0,200,200,DeskDC,0,0,SRCCOPY);
SendMessage(hWndStatic, STM_SETIMAGE , IMAGE_BITMAP,(LPARAM)hb);

Please tell me if you know what is going wrong.

Mark Salsbery11-Oct-07 12:50

Re: hdc to Bitmap [modified]

11-Oct-07 12:50

What are you trying to do???

You want the bitmap to be a copy of a a 200x200 rect of the screen?
That's fine.

You should select the hb bitmap back out of the memory DC before you
hand it off to the static (picture) control.

<font color="Red">HGDIOBJ hOldBM = </font>SelectObject(hdcStatic,hb);
SetWindowLong(hWndStatic,GWL_STYLE,(GetWindowLong(hWndStatic,GWL_STYLE) & ~SS_TYPEMASK) | SS_BITMAP) ;	
BitBlt(hdcStatic,0,0,200,200,DeskDC,0,0,SRCCOPY);
<font color="Red">SelectObject(hdcStatic, hOldBM);</font>

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

GauranG Shah11-Oct-07 18:59

11-Oct-07 18:59

Thnk you vary much for you help. But still I am not able to perform the thing.
I am doing something like this as you have told me to do.

But getting NULL in hOLdBM. and So getting BLANK Image (black Image)

HDC DeskDC = GetDC(NULL);
HDC hdcStatic = GetDC(hWndStatic);
HBITMAP hb = CreateCompatibleBitmap(hdcStatic,200,200);
 //Getting NULL(0x000000) in hOldBM. When I check The error Code it Show 0x00000005. Means "ACCESS DENIED"
HGDIOBJ hOldBM = SelectObject(hdcStatic,hb);   
SelectObject(hdcStatic, hOldBM);

SetWindowLong(hWndStatic,GWL_STYLE,(GetWindowLong(hWndStatic,GWL_STYLE) & ~SS_TYPEMASK) | SS_BITMAP) ;
BitBlt(hdcStatic,0,0,200,200,DeskDC,0,0,SRCCOPY);
SelectObject(hdcStatic, hOldBM);
 
//Gettting noting in the Picture Control         
SendMessage(hWndStatic, STM_SETIMAGE, IMAGE_BITMAP, (LPARAM)hOldBM); 

//Blank Image (Black Colored)
SendMessage(hWndStatic, STM_SETIMAGE, IMAGE_BITMAP, (LPARAM)hb);

-- modified at 2:00 Friday 12th October, 2007

Mark Salsbery11-Oct-07 20:56

11-Oct-07 20:56

Try this

HDC DeskDC = GetDC(NULL);
HDC hdcMem = CreateCompatibleDC(0);
HBITMAP hb = CreateCompatibleBitmap(<font color="Red">DeskDC</font>,200,200); <font color="Red">//<-- Fixed</font>

HGDIOBJ hOldBM = SelectObject(hdcMem,hb);   

BitBlt(hdcMem,0,0,200,200,DeskDC,0,0,SRCCOPY);

SelectObject(hdcMem, hOldBM);
 
SetWindowLong(hWndStatic,GWL_STYLE,(GetWindowLong(hWndStatic,GWL_STYLE) & ~SS_TYPEMASK) | SS_BITMAP) ;

SendMessage(hWndStatic, STM_SETIMAGE, IMAGE_BITMAP, (LPARAM)hb);

*edit* Fixed my bug

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

GauranG Shah11-Oct-07 22:58

11-Oct-07 22:58

Hi Thnx a lot.

It works. But it displays only monochrome bitmap. I.e. the image I m gettting in static control is Blak and white image.

Mark Salsbery12-Oct-07 4:57

Re: hdc to Bitmap [SOLVED]

12-Oct-07 4:57

I screwed up - see my modified post. Sorry about that Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

GauranG Shah11-Oct-07 23:51

11-Oct-07 23:51

Thnx a lot for you help
I just made the little change and its working.................. Smile | :)

HDC DeskDC = GetDC(NULL);
HDC hdcMem = CreateCompatibleDC(DeskDC);
HBITMAP hb = CreateCompatibleBitmap(DeskDC,200,200);
HGDIOBJ hOldBM = SelectObject(hdcMem,hb);
BitBlt(hdcMem,0,0,200,200,DeskDC,0,0,SRCCOPY);
SelectObject(hdcMem, hOldBM);
SetWindowLong(hWndStatic,GWL_STYLE,(GetWindowLong(hWndStatic,GWL_STYLE) & ~SS_TYPEMASK) | SS_BITMAP) ;
SendMessage(hWndStatic, STM_SETIMAGE, IMAGE_BITMAP, (LPARAM)hb);

Re: hdc to Bitmap [SOLVED]

Mark Salsbery12-Oct-07 4:58

12-Oct-07 4:58

You found it....good Smile | :)

Cheers!

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

GauranG Shah10-Oct-07 23:24

10-Oct-07 23:24

Thnx,

but I am not getting what you mean by attaching the bitmap.

Is that mean to create a new bitmap in resource and use that with SelectObject(). If I use this I am getting only that bitmap in the Static control and Not the Image of BitBlt.

GauranG Shah11-Oct-07 0:46

11-Oct-07 0:46

Thnx again.

But I think your code will display the (device Contex) on the Dialog or window you want. That will be cleared when window will be refreshed.

What I want is to display the DC (Device Context ) permanently
i.e. taking it first in bitmap file and then displaying that in Static Picture control.

But I am not able do with the code i have posted. It show only Black Screen (i.e. There is noting in the bitmap).

I dont know how do show the DC permanent. If there is any other simple way please tell me

GauranG Shah11-Oct-07 2:00

11-Oct-07 2:00

Again thnx for your help. but I am not able to unnderstand the code or to implement it. As I am using Win32 dialog based Application and not the MFC application.

And so I am using something like this.

HBITMAP hb = CreateCompatibleBitmap(hdcStatic,200,200);
hb = LoadBitmap(hInst,MAKEINTRESOURCE(IDB_BITMAP1));
HBITMAP hb1;
GetObject(hb,sizeof(hb),&hb1);
SelectObject(hdc,hb1);

//If I use getting nothing in the Static picture control
SendMessage(hWndStatic, STM_SETIMAGE , IMAGE_BITMAP,(LPARAM) hb);
//If I use this instead of above it shows the bitmap in the Static picture control
//bitmap means blank image (white image only)
SendMessage(hWndStatic, STM_SETIMAGE , IMAGE_BITMAP,(LPARAM) hb1);

Nelek11-Oct-07 2:39

Nelek

11-Oct-07 2:39

First, sorry.

I thought Dialog based App using win32 was not Doc/View architechture, but yes MFC. As all what I posted is completelly useless I have deleted the messages. I'm going to explain where I did not understand you, if you clarificate a bit, maybe others can help you better.

quote:
"I require to show the dc into the Picture Control as a bitmap"

As I understand it the DC is the intermediate tool to display bitmap or work with the GUI/Printer. So you load a bitmap in it and you put it in somewhere. But the DC itself can not be shown anywhere as a bitmap, and a bitmap selected in it is already a bitmap, so is only a question of load the resource and place it.

quote:
"If I use this I am getting only that bitmap in the Static control and Not the Image of BitBlt."
Which image of the BitBlt? The BitBlt places the Bitmap selected by the DC where you want to place it, copying from the resources, masking or doing whatever you say in its flags. But if you don't have any image in your resources... what is supposed to be copied?...

So... What do you exactly want to be displayed at your picture control?

quote:
"What I want is to display the DC (Device Context ) permanently"
What do u mean with this? If you reload the same resource when the Dialog is being repainted... is not enough permanent?
If the image has to be so permanent... why don't include it in the picture control at design time?

quote:
"I dont know how do show the DC permanent"
???

quote:
"
//If I use getting nothing in the Static picture control
SendMessage(hWndStatic, STM_SETIMAGE , IMAGE_BITMAP,(LPARAM) hb);
//If I use this instead of above it shows the bitmap in the Static picture control
//bitmap means blank image (white image only)
SendMessage(hWndStatic, STM_SETIMAGE , IMAGE_BITMAP,(LPARAM) hb1);
"

is the blank IDB_BITMAP1 not the blank image you are loading?
And if that is not what you want... what do you want to get?

GauranG Shah11-Oct-07 2:53

11-Oct-07 2:53

Sorry for the Confusion.

I need to perform the simple thing. I want to show the Captured desktop in the Static Picture Control. And want that it doesn't get erased when Dialod get refereshed.

I know how to capture the Desktop using BitBlt. But don't know how to display it show it doesn't get erased.