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How to retrieve a RGB value of Bitmap directly in memory without use GetPixel of the CDC with logical coordinate of the point to be examined?
thx
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You can do that only if you have so-called DIBSection. DIBSection is a bitmap that application can read and write to directly.
Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **
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First you will have to get a pointer to the buffer with a DIB section.
Then you can use LPtoDP to convert the logical coordinate to the device coordinate in the bitmap.
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see GetDIBits, if you want to do it yourself. or, look for one of the many DIB wrapper classes available on this site.
(or try http://www.smalleranimals.com/isource.htm) 
-c
Smaller Animals Software, Inc.
Few things are harder to put up with than the annoyance of a good example.
Mark Twain
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hello everybody
forgive my poor english, it's not my native language.
i have vc++6.0 and i have installed it on win XP home edition.
All seems to work fine, but i wonder:
-which are the 'limitations' or 'pitfalls' of applications developed in this platform? I mean: can they run fine also in win95/98/ME?
-is there a list of functions etc. to not use and that we have to know in order to avoid any 'compatibility trouble'?
any suggestion will be greatly appreciated
thanks in advance
Joe
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Joe IT wrote:
I mean: can they run fine also in win95/98/ME?
Of course.
Joe IT wrote:
is there a list of functions etc. to not use and that we have to know in order to avoid any 'compatibility trouble'?
The reverse is true - you can't write W98/ME/2000/XP specific code without installing the platform SDK. Try TransparentBlt - the compiler won't know what it is ( it's been there since W98 ). You need a PSDK to provide the lib and header files for the compiler to call these functions, even though they are present in the OS.
Christian
The tragedy of cyberspace - that so much can travel so far, and yet mean so little.
"I'm somewhat suspicious of STL though. My (test,experimental) program worked first time. Whats that all about??!?!
- Jon Hulatt, 22/3/2002
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hello Christian
thank you for your reply
so, just to summarize, if i work with vc++6.0 / win XP (as i like to do) i can be sure that my MFC applications will run properly also in the previous platforms. this is my concern
>The reverse is true - you can't write W98/ME/2000/XP >specific code without installing the platform SDK
do you mean of course the case of working inside win xp?
by the way, are the platform SDKs downloadable from msn?
sorry but my knowledge of the vc++6.0 is little and related to MFC only
thanks again
Joe IT
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Hi,
I've found this equation in here:
#define Randomize(min, max) ((rand() % (int)(((max) + 1) - (min))) + (min)) //get a random number between min and max
and I realized that the result generated are the same each time, so I've added this before calling the above equation:
srand((UINT)time(NULL));
But then, when I use multithread, (e.g. 2 threads), they call the Randomize function and the one above, and generate the exact same result.
So, my question is:
How can I get two different results when 2 threads are created at the same time??
(By the way, I've also tried Sleep(Randomize(....)) to let them start at different time...)
PLEASE HELP!!! THANKS!!!
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Try with srand(((unsigned)time(NULL))^GetCurrentThreadId()).
PS: I substituted ^ for |. XOR is better suited for this purpose.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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FINALLY!!! I got stuck for so long!!
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Hi,
I use the following code:
if ( svrSocket.Accept(socket))
AfxMessageBox("Socket is created Succesfully");
flag = socket.Receive(buff,sizeof(buff));
....
Is it true that everytime "socket.Receive(..)" must wait until it actually receives something?? What if I want it to pause the receiving for a small period?? Because it would be simply dead if it never receive anything.
Can anyone please give me advance??
Thank you
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Use asynchronous sockets (CAsyncSocket, if you're doing it the MFC way).
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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Thank you for your reply!!
Yes, I am doing the MFC way. But the socket cannot receive correctly if I use CAsyncSocket instead of CSocket.
Is there a problem of my program?? Or is there another way to do it??
Thanks!
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The mode of use of CAsyncSocket is different than CSocket. Put briefly, with asynchronous sockets you've got to wait for the socket to tell you that reading/writing is permissible. Check the docs for this class.
So I'm afraid you'll have to rewrite portions of your code to change to asynchronous.
An alternative ad hoc solution I just ran into is using Tim Kosse's CSocket-Derived Class that Checks for Timeouts, which hopefully can be plugged into your program with minimum effort.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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Great! Thank you!! Let me try that!!
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Hi,
Can anyone tell me why I got the error?? And what I can do??
"error C2039: 'AfxBeginThread' : is not a member of 'CWinThread'"
CWinThread* pthread;
pthread = AfxBeginThread (Check, this);
UINT CMyClass::Check(LPVOID p)
{
CMyClass * me = (CMyClass *)p;
me->Check();
return 0;
}
void CMyClass::Check()
{...}
Please give advance!! Thank you!!!
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You may try to these:
define the Check() to static,not a member function.
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Thanks!!! But too bad, it doesn't work.
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That compiler error will have displayed a line number. Post the code from that line so we can have a look.
Sorry to dissapoint you all with my lack of a witty or poignant signature.
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hi i've been looking for an example of a menu bar, but really it have a lot of controls, and i need to know what are the basic controls to make, this, what do i need to make a menubar derived from a toolbar?
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check menu control in CP.
http://www.codeproject.com/menu/
Mazy
"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975
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Hello All,
I am trying to locate some VC++ 6.0 example that would show me how to read & write these shortcut LNK files.
In particular I am looking at how to read/write these application ICON files that can be seen on the Windows 95/98/2000 desktop and that are stored the users desktop directory.
These files, I think, are similar to the old PIF files but are now written in binary format and hold the particulars of an application or URL link.
Can anyone please assist?
Thanks,
Lonnie
--
Lonnie Cumberland
OutStep Technologies Incorporated
EMAIL: Lonnie@OutStep.com
: Lonnie_Cumberland@yahoo.com
The Basis Express Virtual Office
&
Data Backup and Recovery Services
URL: http://www.basis-express.com
"The Virtual Office without boundaries!!!"
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The explorer shell functions probably provide you with more than you could ask for. However i'm not 100% sure...Mike Dunn has some cool tut's on Shell extensions so maybe read up on them.
If you wanted to read and write them using CFile or something similar then you'll probably have pretty good luck locating the file structure Here
This is a list of just about every file structure known to man.
Cheers!
"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr
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Look up IShellLink interface in MSDN, also check out Mike Dunn's excellent article at http://www.codeproject.com/com/comintro.asp
---
CPUA 0x5041
Sonork 100.11743 Chicken Little
It may be that your sole purpose in life is simply to serve as a warning to others.
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I have for the last 2-3 days tried to figure out the CControlBar in hopes of designing a custom toolbar, however I have decided time is running out and I must move on, but still refuse to use the standard MFC/common control toolbars.
I figure I will derive my class from CWnd instead of CCOntrolBar, docking isn't really required, I just thought it'd be neat. If neat gives me heart aches, forget about it, i'll dumb it down a little.
For any controlbar it's absolutely essential that if it doesn't dock it alteast re-adjusts itself and the Frame windows client area IMO anyway. While exploring the CControlBar and MFC specific messages I ran across WM_SIZEPARENT which is sent by the parent(Frame) to all child windows within target ID range. Does this mean I could derive from Cwnd (Save myself some brain cells) and as long as my ID was withint range I can receive this message...?
I'm pretty sure this is how this works.
What I really wanna know is...When I have 2 or 3 other control bars (Status, Toolbar and custom dialogbar) when they are all positioned or docked they update the FrameWnd Client area (grow/shrink). It is this rect that is passed in as lParam in WM_SIZEPARENT...?
I tried this earlier and I kept getting the rect for the entire client area, so my custom bar would overlap the others...not a very desiarble effect. Does the frameWnd call RepositionBars each WM_SIZE it receives...? RecalcLayout adjusts the client area...?
Anybody have any ideas or suggestions...? Except Why don't I use CToolBarEx2 or something
Thanx in advance
Have a day!
"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr
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