Using VC7.1 compiler under VC6 IDE.... woes.... :S - C / C++ / MFC Discussion Boards

Re: Finding number of bits set in a given number

Gary R. Wheeler7-Mar-06 2:51

7-Mar-06 2:51

unsigned int sample; // value to count bits in
unsigned int count = ((sample >> 31) & 0x00000001) +
                     ((sample >> 30) & 0x00000001) +
                     ((sample >> 29) & 0x00000001) +
                     ((sample >> 28) & 0x00000001) +
                     ((sample >> 27) & 0x00000001) +
                     ((sample >> 26) & 0x00000001) +
                     ((sample >> 25) & 0x00000001) +
                     ((sample >> 24) & 0x00000001) +
                     ((sample >> 23) & 0x00000001) +
                     ((sample >> 22) & 0x00000001) +
                     ((sample >> 21) & 0x00000001) +
                     ((sample >> 20) & 0x00000001) +
                     ((sample >> 19) & 0x00000001) +
                     ((sample >> 18) & 0x00000001) +
                     ((sample >> 17) & 0x00000001) +
                     ((sample >> 16) & 0x00000001) +
                     ((sample >> 15) & 0x00000001) +
                     ((sample >> 14) & 0x00000001) +
                     ((sample >> 13) & 0x00000001) +
                     ((sample >> 12) & 0x00000001) +
                     ((sample >> 11) & 0x00000001) +
                     ((sample >> 10) & 0x00000001) +
                     ((sample >>  9) & 0x00000001) +
                     ((sample >>  8) & 0x00000001) +
                     ((sample >>  7) & 0x00000001) +
                     ((sample >>  6) & 0x00000001) +
                     ((sample >>  5) & 0x00000001) +
                     ((sample >>  4) & 0x00000001) +
                     ((sample >>  3) & 0x00000001) +
                     ((sample >>  2) & 0x00000001) +
                     ((sample >>  1) & 0x00000001) +
                     (sample         & 0x00000001);

Of course, this assumes that you know that an unsigned int occupies 32 bits.

Software Zen: delete this;

Fold With Us![^]

Re: Finding number of bits set in a given number

toxcct7-Mar-06 2:53

toxcct

7-Mar-06 2:53

is it the "longest/hugest/slowest" contest ? lol

Gary R. Wheeler wrote:
this assumes that you know that an unsigned int occupies 32 bits.

you mean, on a 32 bits systems of course...

Re: Finding number of bits set in a given number

Gary R. Wheeler7-Mar-06 2:59

Gary R. Wheeler

7-Mar-06 2:59

Actually, this is probably a reasonably fast solution, at least on Intel hardware. Bit shifts are done with a barrel shifter, which means all of the >> operations are done only in a 4-10 clock cycles IIRC. The & operations are similar. This means the entire expression could be evaluated in a few hundred clocks.

Yes, it's verbose. It has the advantage of simplicity, doesn't require a global table, and could be inlined if necessary.

Software Zen: delete this;

Fold With Us![^]

Re: Finding number of bits set in a given number

BadKarma7-Mar-06 6:03

BadKarma

7-Mar-06 6:03

This works also, and its pretty fast Poke tongue | ;-P

int A = 0xAA000000;
int B;
__asm
{
  mov eax, dword ptr [A] ;
  mov ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  SHL eax,1 ;
  ADC ebx,0 ;
  MOV dword ptr [B],ebx ;
}

I know the following is better but he said no loops

int A = 0xAA000000;
int B;

__asm
{
  mov eax, dword ptr [A] ;
  mov ebx,0 ;
  here:
  SHL eax,1 ;
  ADC ebx,0 ;
  CMP eax, 0
  JNE here
  MOV dword ptr [B],ebx ;
}

codito ergo sum

DirectShow SDK download

Storm-blade7-Mar-06 0:03

Storm-blade

7-Mar-06 0:03

Hi,
Does anyone know where I can download the Latest DirectShow SDK?
It seems Microsoft is trying to discourage people from using directshow by hiding the SDK. its been removed from the DirectX SDK, and I can't find a download link for it with either Google or MSDN searches...

I need to render video to a Direct3D9 texture, the samples for doing this were in the directshow section of the directX SDK, which has been removed.

Thanks...

Re: DirectShow SDK download

Justin Tay7-Mar-06 5:26

Justin Tay

7-Mar-06 5:26

DirectShow has been moved into the Platform SDK but all the project files have been stripped out. I think the best one to get is the DirectX SDK February 2005 Extras.

Re: question

toxcct7-Mar-06 0:01

toxcct

7-Mar-06 0:01

::ShellExecute(NULL, "open", "the_file_to_open_htm", NULL, NULL, SW_SHOWNORMAL);[^]

Using VC7.1 compiler under VC6 IDE.... woes.... :S

kevingpo6-Mar-06 23:52

kevingpo

6-Mar-06 23:52

Has anyone tried compiling a VC6 MFC application using the VC7.1 compiler?

I followed this simple article on making VC6 to use the VC7.1 compiler.
http://pixwiki.bafsoft.com/wiki/index.php/Using_the_Optimizing_VC7_Compiler_with_the_VC6_IDE

Then all the errors I've been getting have been from the actual C:\Program
Files\Microsoft Visual Studio\VC98\MFC\Include\ folder (loads of template
syntax errors).

Surely Microsoft must've made a portability/conversion for VC6 MFC to be
used under VC7.1?

Re: Using VC7.1 compiler under VC6 IDE.... woes.... :S

toxcct6-Mar-06 23:59

toxcct

6-Mar-06 23:59

the VC6 compiler wasn't standard compliant...

so it is totally normal to get errors when migrating VC6 projects to VC7.1...

even if the errors come from the compiler's include\ folder, the problem comes from your code...

Re: Using VC7.1 compiler under VC6 IDE.... woes.... :S

kevingpo7-Mar-06 0:03

kevingpo

7-Mar-06 0:03

But it was saying specific things about MFC source files... eg. missing ;, type not found. It's probably namespaces, and maybe a little syntax change. I do not know the inner workings of MFC nor the difference between the VC6 & VC7.1 template syntax.

Currently am looking for a nice script/conversion tool to convert VC6 source files into VC7.1 compliant.

What happened to MFC/ATL in VS.NET2003? Does MFC/ATL still exist in VS.NET2003 or have they been replaced with STL?

Re: Using VC7.1 compiler under VC6 IDE.... woes.... :S

mkuhac7-Mar-06 2:01

mkuhac

7-Mar-06 2:01

kevingpo wrote:
Does MFC/ATL still exist in VS.NET2003 or have they been replaced with STL?

This is illogical question because STL is collection oriented, while MFC and/or ATL/WTL are GUI oriented. Can you build Windows application with just collections (no menus, windows, buttons...)??

Re: Using VC7.1 compiler under VC6 IDE.... woes.... :S

Gary R. Wheeler7-Mar-06 2:55

Gary R. Wheeler

7-Mar-06 2:55

It sounds like you are trying to use the 7.1 compiler and the VC6 MFC headers. You would be better off to use the 7.1 headers. Check the include file paths in your 7.1 settings, and make sure the 7.1 include paths come first.

Software Zen: delete this;

Fold With Us![^]

List View Multiple Selection

Anil_vvs6-Mar-06 23:39

Anil_vvs

6-Mar-06 23:39

Hi All,

Can anyone tell me how to enable multiple selection in a List View?

Thanks and Regards,
Anil

Re: List View Multiple Selection

Nibu babu thomas6-Mar-06 23:47

Nibu babu thomas

6-Mar-06 23:47

It's enabled by default.

Nibu thomas
Software Developer

Re: List View Multiple Selection

Xing Chen7-Mar-06 16:14

Xing Chen

7-Mar-06 16:14

Remove List View 's LVS_EX_SIMPLESELECT style.

read from physical memory

ss20066-Mar-06 23:38

ss2006

6-Mar-06 23:38

read from physical memory

am

Re: read from physical memory

fisp6-Mar-06 23:51

fisp

6-Mar-06 23:51

ss2006 wrote:
read from physical memory

Yeah! Good point, but can you outbid this:
write to physical memory

:->

Re: read from physical memory

David Crow7-Mar-06 3:49

David Crow

7-Mar-06 3:49

Do you have a question?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

read from physical memory

ss20066-Mar-06 23:37

ss2006

6-Mar-06 23:37

how i can raed from ram loaded

am

Re: read from physical memory

toxcct6-Mar-06 23:41

toxcct

6-Mar-06 23:41

continue repost and repost and starting new threads is the better way to get flamed Frown | :(

consider this as an advice...

can you use the [Reply] link like everybody here ?

Workspace problem

romuzu6-Mar-06 23:35

romuzu

6-Mar-06 23:35

Hi!

My workspace cant open all the classes of my project then the workspace window is all black out. What seems to be a problem and how can i solve this problem?

Re: Workspace problem

toxcct6-Mar-06 23:37

toxcct

6-Mar-06 23:37

close the solution/workspace, then delete the .ncb file, then reopen the workspace...

Re: Workspace problem

romuzu7-Mar-06 16:09

romuzu

7-Mar-06 16:09

thanks! it helped a lot.

CDocument::UpdateAllViews MFC

P e t e r6-Mar-06 23:28

P e t e r

6-Mar-06 23:28

When sending GetDocument()->UpdateAllViews alle views are flickering once. Can anybody tell me how to disable that flickering? Do I have to modify OnUpdate? I tried to do something with InvalidateRect but it does not solve my problem.

Best regards,

Peter

Confused | :confused:

Re: CDocument::UpdateAllViews MFC

Arman S.6-Mar-06 23:38

Arman S.

6-Mar-06 23:38

HI,

A view flickers because of the stuff it draws. So, try to optimize what they drawing.

--
======
Arman

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.