C / C++ / MFC

Re: Trying to port libcddb to MSVC, having issues...

19-Nov-15 21:05

Xor with a constant that has all bits set:

C++

int n1 = ~a; 
int n2 = a ^ UINT_MAX;

But I can't believe that it is not implemented. MSDN says it is: https://msdn.microsoft.com/en-us/library/dxt4z71k.aspx[^].

CPallini19-Nov-15 21:24

CPallini

19-Nov-15 21:24

Brisingr Aerowing wrote:
WHY ON EARTH IS IT MISSING IN THE FIRST PLACE?!?

That is the proper question.
Could you please report the exact error message (and any accessory, useful info)?

Re: Trying to port libcddb to MSVC, having issues...

Richard MacCutchan19-Nov-15 23:13

Re: Trying to port libcddb to MSVC, having issues...

19-Nov-15 23:13

Brisingr Aerowing wrote:
the ~ operator (bitwise not) not being implemented

That would break a lot of software, I suspect something else is the actual issue. A sample of the code and the error details would help.

[edit]
Are you sure this is MSVC 14? no such version referenced on MSDN[^] as far as I can see.
[/edit]

Jochen Arndt20-Nov-15 0:14

Re: Trying to port libcddb to MSVC, having issues...

20-Nov-15 0:14

Richard MacCutchan wrote:
Are you sure this is MSVC 14?

That is the compiler version: Microsoft Visual C/C++ Compiler version 14. That version is part of Visual Studio 2015.

Richard MacCutchan20-Nov-15 0:23

Re: Trying to port libcddb to MSVC, having issues...

20-Nov-15 0:23

MSVC is the IDE not the compiler.

Jochen Arndt20-Nov-15 0:53

Re: Trying to port libcddb to MSVC, having issues...

20-Nov-15 0:53

You are right, it is not only the compiler but the complete C/C++ development environment.

But version 14 is those from VS 2015. See for example the Wikipedia[^].

Richard MacCutchan20-Nov-15 3:02

Re: Trying to port libcddb to MSVC, having issues...

20-Nov-15 3:02

I have VS 2013 express and the C compiler is:

C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC>cl -v
Microsoft (R) C/C++ Optimizing Compiler Version 18.00.21005.1 for x86
Copyright (C) Microsoft Corporation.  All rights reserved.

Jochen Arndt20-Nov-15 3:06

Re: Trying to port libcddb to MSVC, having issues...

20-Nov-15 3:06

The 18 is the RTM number from my above link.
What a mess with all these different numbers for a single product Mad | :mad:

Richard MacCutchan20-Nov-15 3:03

STL list member function(S)

20-Nov-15 3:03

OP deleted his question; I can guess why.

Amr.Mohammad8719-Nov-15 7:05

Amr.Mohammad87

19-Nov-15 7:05

void assign(size_type n, el const T& el = T())

This function is a member function of the STL list class and I do not understand the bolded part. I understand the const T& el is a reference to a constant parameter which means I cannot change the value/content of the passed argument + I understand that el = T() means a default parameter so if there is no argument passed in the calling function the el will use the no-argument constructor of the T() type OK. But what make me confused the el at the beginning before the const?!!! so if someone can fill the blank gaps for me I will be grateful Smile | :)

. Thanks in advance.

Re: STL list member function(S)

C^hris L^osinger19-Nov-15 7:41

C^hris L^osinger

19-Nov-15 7:41

which compiler are you using?

i haven't been able to find any std::list::assign definitions that look like that.

http://www.cplusplus.com/reference/list/list/assign/[^], for both C++98 and C++11, has

C++

void assign (size_type n, const value_type& val);

MSVC 8.0 has the same. so does the current MSDN (https://msdn.microsoft.com/en-us/library/w3eba3dd.aspx?f=255&MSPPError=-2147217396[^])

image processing toolkits | batch image processing

Re: STL list member function(S)

Amr.Mohammad8719-Nov-15 12:47

Amr.Mohammad87

19-Nov-15 12:47

I read it in a book called "Data Structures and Algorithms in C++, 4th Edition by Adam Drozdek" it was in chapter 3 "Linked Lists" at the beginning of page 110 Smile | :)

. It made me had the feeling of this WTF | :WTF:

when read it, and after searching and find nothing I become like this Poke tongue | ;-P

;P;P (i.e., psycho). Thanks by the way for reply Smile | :)

Re: STL list member function(S)

CPallini19-Nov-15 21:26

CPallini

19-Nov-15 21:26

Looks like a typo, to me.

Returning CBitmap* pointer

_Flaviu18-Nov-15 20:15

_Flaviu

18-Nov-15 20:15

I have wrote a method that load and rescale a CBitmap:

C++

CBitmap* CMyDlg::LoadPicture(CString strFile)
{
	int m_nPictureSize = 170;
	CBitmap* pBitmap = NULL;
	HBITMAP hBitmap = (HBITMAP)::LoadImage(NULL, strFile, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
	if(NULL != hBitmap)
	{
		CBitmap Bitmap, MemBitmap;
		Bitmap.Attach((HBITMAP)hBitmap);
		// rescale CBItmap ....
		// retrieve the final bitmap
		CBitmap* pFinalBitmap = MemDC.SelectObject(pOldBitmap);
		SourceDC.SelectObject(pOldBmp);
		pBitmap = new CBitmap;
		pBitmap->Attach((HBITMAP)pFinalBitmap->GetSafeHandle());
BITMAP bm3;
pBitmap->GetBitmap(&bm3);
TRACE("Width and height INSIDE if condition: %d|%d\n", bm3.bmWidth, bm3.bmHeight);
	}
BITMAP bm4;
pBitmap->GetBitmap(&bm4);
TRACE("Width and height OUTSIDE if condition: %d|%d\n", bm4.bmWidth, bm4.bmHeight);
	return pBitmap;
}

I want to use this method in order to add this created CBitmap pointer to add them into CTypedCBitmapList:

C++

CBitmap* pImage = LoadPicture(strPath);
if(NULL == pImage->GetSafeHandle())
    return 0;
m_PtrArrayBitmap.Add(pImage);

Ok, but the strange thing is that pBitmap from inside of LoadPicture method has correct size inside of 'if' condition, and wrong size outside of 'if' condition:

C++

Width and height INSIDE if condition: 170|170
Width and height OUTSIDE if condition: -858993460|-858993460

Why ? It is not the same pBitmap object ? Could you help me ? Kindly thank for any further help !

Re: Returning CBitmap* pointer

Richard MacCutchan18-Nov-15 21:40

Re: Returning CBitmap* pointer

18-Nov-15 21:40

It appears that the bitmap you are pointing to is a temporary object whose scope is only within the if block. In the following block of code where do pOldBitmap and pOldBmp come from?

C++

CBitmap* pFinalBitmap = MemDC.SelectObject(pOldBitmap);
SourceDC.SelectObject(pOldBmp);
pBitmap = new CBitmap;
pBitmap->Attach((HBITMAP)pFinalBitmap->GetSafeHandle());

_Flaviu19-Nov-15 0:20

_Flaviu

19-Nov-15 0:20

I think I figure out why it doesn't work ... pOldBitmap and pOldBmp are decalred inside of 'if' statement:

C++

	if(NULL != hBitmap)
	{
		//// ......
		// select memory bitmap into memory dc
		CBitmap* pOldBitmap = MemDC.SelectObject(&MemBitmap);
		// create a source dc
		CDC SourceDC;
		SourceDC.CreateCompatibleDC(&cdc);
		// select into source dc the source bitmap
		CBitmap* pOldBmp = SourceDC.SelectObject(&Bitmap);
		//// ......
		// retrieve the final bitmap
		CBitmap* pFinalBitmap = MemDC.SelectObject(pOldBitmap);
		SourceDC.SelectObject(pOldBmp);
		pBitmap = new CBitmap;
		pBitmap->Attach((HBITMAP)pFinalBitmap->GetSafeHandle());
BITMAP bm3;
pBitmap->GetBitmap(&bm3);
TRACE("Width and height INSIDE if condition: %d|%d\n", bm3.bmWidth, bm3.bmHeight);
	}
BITMAP bm4;
pBitmap->GetBitmap(&bm4);
TRACE("Width and height OUTSIDE if condition: %d|%d\n", bm4.bmWidth, bm4.bmHeight);
	return pBitmap;

Re: Returning CBitmap* pointer

Richard MacCutchan19-Nov-15 1:43

19-Nov-15 1:43

Well, that is quite different from the code in your original question.

C++

Member 1215089418-Nov-15 11:38

Member 12150894

18-Nov-15 11:38

If a, b and c are variable of type int. without changing the types write a program to display
C = 1.5 if a is 3 and b is 2

Richard Andrew x6418-Nov-15 12:00

Richard Andrew x64

18-Nov-15 12:00

We don't do your homework. Thumbs Down | :thumbsdown:

The difficult we do right away...
...the impossible takes slightly longer.

Member 1215089418-Nov-15 12:06

Member 12150894

18-Nov-15 12:06

sorry...didnt mean to be rude its just a test i saw somewhere and i dont know how to do it...all i want is for you guys to tell me what its under or explain what im supposed to do not to write the program. I'm a beginner in C++...Pls guys

CPallini18-Nov-15 21:52

CPallini

18-Nov-15 21:52

#include <stdio.h>
int main()
{
  int a,b,c;
  if (a==3 && b==2) printf("C=1.5\n");
  return 0;
}

Jochen Arndt18-Nov-15 22:54

18-Nov-15 22:54

For a precision of one-tenth:

C++

printf("C = %d.%d\n", a / b, abs(((10 * a) / b) % 10));