C / C++ / MFC

Re: why can't we declare data member of class auto register or extern

8-Jul-08 6:53

Because none of those make sense used on a class member.

Mark

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

rajneshmalik8-Jul-08 18:27

rajneshmalik

8-Jul-08 18:27

but when we write like
class a
{
int i;
};
then obviously by default data type of i is auto int
my question is why compiler don't accept this,and why none of those make sense as you wrote.
if u have any link related to this question please send me

thank u in advance

Re: why can't we declare data member of class auto register or extern

Mark Salsbery9-Jul-08 5:43

Re: Compare two XML Files

9-Jul-08 5:43

rajneshmalik wrote:
then obviously by default data type of i is auto int

No, it isn't. i is a class member.

auto variables have a local lifetime - the lifetime of i is determined by the
lifetime of the object it is in.

register - same thing. You've only declared i. Until there's an instance of an "a" object,
i doesn't exist. How, then, can you give i a storage specifier?

extern? Makes NO sense. How can a member of an object be somewhere else - some external location?

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

Compare two XML Files

manju#1237-Jul-08 19:29

manju#123

7-Jul-08 19:29

Hi all..
I want to compare two xml files using vc++ and store the output in the xml format...
When i searched in MSDN .I got the tool..i.e XML Diff and Patch GUI Tool...
Can i use the tool in my program..I am using Visual Studio 6.0...or it supports only .net framework
If yes means how can i use it..
should i install anything or
i should include anu dlls or
include any .h files.
I went through msdn..but i got confused a bit..please can anyone brief me how to use it..
If i got some example..it will well and good....
else brief about so that i can understand and use it..

thank you
manju

Hi..
I am Mnaju.I have Completed my B.E Computers Science.Lokking for a job.I am interested in VC++
manju

Sarath C7-Jul-08 19:56

Sarath C

7-Jul-08 19:56

The code is written in C# so it's better to use Managed code itself to get teh required functionality from this library. Otherwise you will have to port the code to C++.

There are some tweaks to call C# code from native C++.

Exposing .NET Components to COM[^]
Calling C# code from C++[^]
.NET COM IOP[^]

Anyway I've never tried this out. Please check it.

-Sarath.
"Great hopes make everything great possible" - Benjamin Franklin

My blog - Sharing My Thoughts, An Article - Understanding Statepattern

Re: Compare two XML Files

manju#1237-Jul-08 20:31

manju#123

7-Jul-08 20:31

Hi..
Thanks for your reply..
Is there any tool to compare two xml files using vc++...
or else can u provide me a any links where i can get some vc++ code examples to compare two xml files

thank you
manju

Hi..
I am Mnaju.I have Completed my B.E Computers Science.Lokking for a job.I am interested in VC++
manju

help in vc++(files)

projectip7-Jul-08 19:04

7-Jul-08 19:04

I have a dialog based application.I use a text box in it.what i want is write the details from that text box into a text file.
when i wrote the code ,the data written into the file was as follows..??a??????ý????ý
My code is,

CString str;<br />
GetDlgItemText(IDC_EDIT1,str);<br />
fstream f;<br />
f.open("C:\\myfile.txt",ios::app);<br />
f.write((LPCTSTR)str,10);<br />
f.close();<br />

_AnsHUMAN_ 7-Jul-08 19:22

_AnsHUMAN_

7-Jul-08 19:22

str is uninitialized and therefore the value displayed in the edit box is a garbage value.
Initialize the str to something meaningful.

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

_AnShUmAn_

projectip7-Jul-08 19:27

7-Jul-08 19:27

initialized it to spaces.-> CStraing str="";
But it still doesn't work.

_AnsHUMAN_ 7-Jul-08 20:04

_AnsHUMAN_

7-Jul-08 20:04

CString str="";
	GetDlgItemText(IDC_EDIT1,str);
	fstream f;
	f.open("C:\\myfile.txt",ios::out|ios::app);
	f.write((LPCTSTR)str,str.GetLength ());
	f.close();

This will help

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

_AnShUmAn_

projectip7-Jul-08 20:23

7-Jul-08 20:23

yes,now that works.
what if i want to write the new value in the edit box in newline.now all the data are written in single line.

_AnsHUMAN_ 7-Jul-08 20:31

_AnsHUMAN_

7-Jul-08 20:31

Append \r\n in the string where you want a line break

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

_AnShUmAn_

projectip7-Jul-08 20:50

7-Jul-08 20:50

i tried f<<endl.that worked.Thanks...

Sarath C7-Jul-08 19:39

Sarath C

7-Jul-08 19:39

projectip wrote:
f.write((LPCTSTR)str,10);

I think this statement makes the problem. give proper length of the source buffer. If the string length less than 10, this problem may occur.

Please try with this.

f.write((LPCTSTR)str,str.GetLength());

-Sarath.
"Great hopes make everything great possible" - Benjamin Franklin

My blog - Sharing My Thoughts, An Article - Understanding Statepattern

Not able to see RT_MANIFEST in the exe

David Crow8-Jul-08 3:20

David Crow

8-Jul-08 3:20

projectip wrote:
f.write((LPCTSTR)str,10);

Why the unnecessary cast?

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

subramanyeswari7-Jul-08 18:55

subramanyeswari

7-Jul-08 18:55

Hi,

I followed this link for embedding manifest in the exe.

http://msdn.microsoft.com/en-us/library/bb756929.aspx

I could see RT_MANIFEST markup in the exe(using resourcehacker).

But yesterday when i rebuilt my application (both in vista and windows 2003 server) i am not able to see RT_MANIFEST markup in the exe. Instead i saw a number 24 under that my manifest file is there.

Are some settings changed? I am not able to figure it out. Can any one help me?

Regards

Re: Not able to see RT_MANIFEST in the exe

Sarath C7-Jul-08 19:43

Sarath C

7-Jul-08 19:43

Did you change the build order from Unicode?

-Sarath.
"Great hopes make everything great possible" - Benjamin Franklin

My blog - Sharing My Thoughts, An Article - Understanding Statepattern

Re: Not able to see RT_MANIFEST in the exe

subramanyeswari8-Jul-08 1:37

subramanyeswari

8-Jul-08 1:37

where to look for that?

[GDI+] alpha determined by gray value

followait7-Jul-08 17:20

followait

7-Jul-08 17:20

When drawing a bitmap, I want to draw it with a new alpha value as below. Do I have to clone a bitmap and make changes pixel by pixel?

DWORD Gray1000=pClr->GetRed()*299+pClr->GetGreen()*587+pClr->GetBlue()*114;
BYTE newAlpha=BYTE(Gray1000/1000);

system

Re: [GDI+] alpha determined by gray value

pallaka7-Jul-08 20:30

pallaka

7-Jul-08 20:30

If it is a replace a single color .You can do raster operations.
else create a platte and store the color reference tables.And update the color by pixcel wise.

Help:
HBITMAP GlobalBlitReplaceColor (HBITMAP hBmp,COLORREF cOldColor,COLORREF cNewColor,HDC hBmpDC)
{
HBITMAP RetBmp=NULL;
if (hBmp)
{
HDC BufferDC = CreateCompatibleDC(NULL); // DC for Source Bitmap
if (BufferDC)
{
HBITMAP hTmpBitmap = (HBITMAP) NULL;
if (hBmpDC)
{
if (hBmp == (HBITMAP)GetCurrentObject(hBmpDC, OBJ_BITMAP))
{
hTmpBitmap = CreateBitmap(1, 1, 1, 1, NULL);
SelectObject(hBmpDC, hTmpBitmap);
}
}
// here BufferDC contains the bitmap
HGDIOBJ PreviousBufferObject = SelectObject(BufferDC,hBmp);
HDC DirectDC=CreateCompatibleDC(NULL); // DC for working
if (DirectDC)
{
HDC MaskDC=CreateCompatibleDC(NULL); // DC for mask
if (MaskDC)
{
// Get bitmap size
BITMAP bm;
GetObject(hBmp, sizeof(bm), &bm);

// create a BITMAPINFO with minimal initilisation for the CreateDIBSection
BITMAPINFO RGB32BitsBITMAPINFO;
ZeroMemory(&RGB32BitsBITMAPINFO,sizeof(BITMAPINFO));
RGB32BitsBITMAPINFO.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
RGB32BitsBITMAPINFO.bmiHeader.biWidth = bm.bmWidth;
RGB32BitsBITMAPINFO.bmiHeader.biHeight = bm.bmHeight;
RGB32BitsBITMAPINFO.bmiHeader.biPlanes = 1;
RGB32BitsBITMAPINFO.bmiHeader.biBitCount = 32;
RECT tmprect = {0,0,bm.bmWidth,bm.bmHeight};
// creating the Monochrom bitmap with existing bitmap dimmensions
HBITMAP bitmapTrans = CreateBitmap(bm.bmWidth,bm.bmHeight,1,1,NULL);
DeleteObject(SelectObject (MaskDC,bitmapTrans));

SetBkColor(BufferDC,cOldColor);
RetBmp = CreateBitmap(bm.bmWidth,bm.bmHeight,1,32,NULL);
HGDIOBJ PreviousObject = SelectObject (DirectDC,RetBmp);
HBRUSH sb = CreateSolidBrush(cNewColor);
FillRect(DirectDC,&tmprect,sb);
DeleteObject(sb);
//Computing the raster operations on Bitmap to load the colors dynamically into bitmap
BitBlt(MaskDC, 0, 0, bm.bmWidth, bm.bmHeight, BufferDC, 0, 0, SRCCOPY);
BitBlt(DirectDC, 0, 0, bm.bmWidth, bm.bmHeight, BufferDC, 0, 0, SRCINVERT);
BitBlt(DirectDC, 0, 0, bm.bmWidth, bm.bmHeight, MaskDC, 0, 0, SRCAND);
BitBlt(DirectDC, 0, 0, bm.bmWidth, bm.bmHeight, BufferDC, 0, 0, SRCINVERT);
// releasing the memory
DeleteObject(PreviousObject);
DeleteObject(bitmapTrans);
DeleteDC(MaskDC);
}
// clean up
DeleteDC(DirectDC);
}
// BufferDC is now useless
if (hTmpBitmap)
{
SelectObject(hBmpDC, hBmp);
DeleteObject(hTmpBitmap);
}
SelectObject(BufferDC,PreviousBufferObject);
DeleteDC(BufferDC);
}
}
return RetBmp;
}

Re: [GDI+] alpha determined by gray value

Mark Salsbery8-Jul-08 6:55

8-Jul-08 6:55

followait wrote:
Do I have to clone a bitmap and make changes pixel by pixel?

You do if you don't wan't to change the original bitmap.

Mark

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

CHAT PROGRAMME

bodhi20167-Jul-08 7:37

bodhi2016

7-Jul-08 7:37

Hi Guys i have just made a winsock programme(console mode).
It is a simple programme in which the client software
displays the text inputted in the server programme
using the function cin.getline().Now i want to make a chat programme
conlose mode.But i tried to use the send() function in the
client software but it is not working,so how can the two programme
chat wuth each other.My main point is that i am trying to maje chat
programme can anybody tell me some god tutirial or give me some guideline

Re: CHAT PROGRAMME

Mark Salsbery7-Jul-08 7:46