C / C++ / MFC

C^hris L^osinger27-Apr-05 1:29

27-Apr-05 1:29

if you need quick access to all pixels, you'll need to use GetDIBits . that will give you a DIB, which is a BITMAPINFOHEADER struct followed by the pixel data - vertically flipped, probably stored in BGR order (maybe BGRA depending on your video driver), with pixel rows padded to multiples of four bytes.

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ThatsAlok27-Apr-05 2:16

ThatsAlok

27-Apr-05 2:16

Look for [GetDIBits] api!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Roger Allen27-Apr-05 5:51

Roger Allen

27-Apr-05 5:51

ANother way would be to select the bitmap into a DC and use GetPixel()

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ThatsAlok27-Apr-05 23:26

ThatsAlok

27-Apr-05 23:26

Roger Allen wrote:
DC and use GetPixel()

How?? I believe we first have to paint the Bitmap into Window then we can use GetPixel() method!

is there is any direct method to do so!if yes please tell!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Roger Allen28-Apr-05 2:48

Roger Allen

28-Apr-05 2:48

A bitmap only needs to be selected into a DC for you to access it. Here is some example code extracted from my OD menu class:

COLORREF backgroundColour = 0;
{
    CDC dcCopy;
    dcCopy.CreateCompatibleDC(NULL);
    dcCopy.SaveDC();
    dcCopy.SelectObject(&toolbarBitmap);
    backgroundColour = dcCopy.GetPixel(0, 0);               // toolbars use pixel 0,0 of image 0 as the background colour
    dcCopy.RestoreDC(-1);
    dcCopy.DeleteDC();
}

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ThatsAlok28-Apr-05 2:55

ThatsAlok

28-Apr-05 2:55

thanks i am looking for it quite long time!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

WIndows XP

densitet27-Apr-05 0:44

densitet

27-Apr-05 0:44

Hello everybody, i have a simple questions i think, but i don't know the answers:
Before all, i have to say that i have create a andministrator and an limited user account.
But my questions are:

1) If we add a shortcut to the Start Menu | Programs | Start Up of our application but in the administrator account. It will starts to work if for example we log in in the WXP with the limited account. And if it starts to run, we can prohibite to the limitate account to don't stop the application?

2) If we add a entry in the registry to start our application, how we can stop to the user to don't delete this entry in the registry?

Thank u for the possible help.

Why OpenDocument Failed

zahid_ash27-Apr-05 0:15

27-Apr-05 0:15

Hi,

My SDI program was opening all saved files , that was saved by it ( in its Extension).

Error Message displayed by program is "Unexpected file format"

I made a Change in Serialize variables ( i added one more)
Now the Program is not opeing old Saved Files.
But it can open Newly made and saved files after changing.

Any suggestion?

Regards.

C^hris L^osinger27-Apr-05 1:37

27-Apr-05 1:37

you need to find a way to distinguish old-format files from new-format files.

one way is to use the version info in the Serialization object:

// replace XXXXX with your current object version ID number
IMPLEMENT_SERIAL (CFoo, CObject,VERSIONABLE_SCHEMA|XXXXX)
 
void CFoo::Serialize( CArchive& ar )
{
   CObject::Serialize( ar );
 
   if ( ar.IsStoring() )
   {
      ...
   }
   else
   {
      int nVersion = ar.GetObjectSchema();
 
      switch(nVersion)
      {
         case 2: // newest version
           read new version data
           break;
         case 1: // next-to-newest version
           read data for that version    
           break;
         case 0: // etc...
      }
}

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zahid_ash27-Apr-05 2:10

27-Apr-05 2:10

But i have the following

IMPLEMENT_SERIAL (CFoo, CObject, 1)

For both Old one and for new one that has the add one more serialize vriable.

Will not it return same for

int nVersion = ar.GetObjectSchema();

If it will , then how can i handle it.

thanx

Regards.

C^hris L^osinger27-Apr-05 2:13

27-Apr-05 2:13

zahid_ash wrote:
For both Old one and for new one that has the add one more serialize vriable

you have to change the version number when you change the schema.

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zahid_ash27-Apr-05 2:28

27-Apr-05 2:28

thanx i understand it. i will try on it

one more thing In

IMPLEMENT_SERIAL (CFoo, CObject,VERSIONABLE_SCHEMA|XXXXX)

is it neccesry to write VERSIONABLE_SCHEMA or only an integer is enough
as i did

IMPLEMENT_SERIAL (CFoo, CObject, 1)

thanx

Regards.

C^hris L^osinger27-Apr-05 3:15

27-Apr-05 3:15

according to the MSDN on GetObjectSchema:

A CObject-derived class may use VERSIONABLE_SCHEMA combined (using bitwise OR) with the schema version itself (in the IMPLEMENT_SERIAL macro) to create a “versionable object,” that is, an object whose Serialize member function can read multiple versions. The default framework functionality (without VERSIONABLE_SCHEMA) is to throw an exception when the version is mismatched.

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zahid_ash27-Apr-05 19:42

27-Apr-05 19:42

HI

In my IMPLEMENT_SERIAL is as follows for both old and new versions:

IMPLEMENT_SERIAL (CFoo, CObject, 1)
then

int nVersion = ar.GetObjectSchema();

is returning -1 that means version is unknown .

now how can i distinguish the versions..

thanks

Regards.

C^hris L^osinger28-Apr-05 1:31

28-Apr-05 1:31

use VERSIONABLE_SCHEMA

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