C / C++ / MFC Discussion Boards

Re: how to capture the screen efficiently?

Paul M Watt6-Jun-02 17:45

6-Jun-02 17:45

Most likely you will have to resort to a virtual video driver the same way that netmeeting does. There is a function called GetBoundsRect that will accumulate changes to a DC, but I have not been able to get it to work with a WindowsDC only memory DCs. So if you can get that to work more poer to you (and I would also like to know what you did to get it to work).

Besides that I have done quite a bit of work to capture the screen and the fastest that I could get my utility was about 800ms on a 1000Mhz machine. The bottleneck is sending the data from the video card memory to system memory.

Once again, look at how netmeeting accomplishes this, they incorporate a virtual video driver so all new screen updates are written to their buffer as well as the screen buffer.

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Re: how to capture the screen efficiently?

Mike Nordell7-Jun-02 1:54

Mike Nordell

7-Jun-02 1:54

You might want to have a look at the VNC source code. It's somewhere at AT&T research IIRC, but Google is your friend.

How do i convert char * to LPOLESTR?

redeemer6-Jun-02 11:27

redeemer

6-Jun-02 11:27

thanks

Re: How do i convert char * to LPOLESTR?

Christian Graus6-Jun-02 11:40

Christian Graus

6-Jun-02 11:40

Try wrapping your string in a _bstr_t by including comutils.h. It converts between wide and narrow strings internally.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Re: How do i convert char * to LPOLESTR?

redeemer6-Jun-02 12:52

redeemer

6-Jun-02 12:52

is this correct usage?:

_bstr_t test;
test = szCompletePath;

szCompletePath is a null terminated string (char szCompletePath[MAX_PATH]) and then pass test in a function that takes an LPOLESTR parameter?

thanks

Re: How do i convert char * to LPOLESTR?

Christian Graus6-Jun-02 12:59

Christian Graus

6-Jun-02 12:59

That's fine, but

_bstr_t test(szCompletePath);

is better, because it is more efficient Smile | :)

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Re: How do i convert char * to LPOLESTR?

redeemer6-Jun-02 13:01

redeemer

6-Jun-02 13:01

But when i pass the test variable in the IShellFolder::ParseDisplayName function, it returns the error code -2147024809 which, accoring to the Error Lookup means "The parameter is incorrect.". Any ideas?

Re: How do i convert char * to LPOLESTR?

Christian Graus6-Jun-02 13:18

Christian Graus

6-Jun-02 13:18

Dunno - it looks like it should be OK to me.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Re: How do i convert char * to LPOLESTR?

Ernest Laurentin6-Jun-02 19:26

Ernest Laurentin

6-Jun-02 19:26

Try casting again the string to const WCHAR* (or const wchar_t*)
when calling ParseDisplayName, since that function need an OLE String.
Good luck!

One good thing about getting older, you don't lose the ages you've been!

Drawing tool

Haakon S.6-Jun-02 10:28

Haakon S.

6-Jun-02 10:28

Does anybody know of any articles describing the basics behind drawing lines between nodes. It would be a simple, general CAD tool which could be expanded to make programs for drawing flowcharts, electric circuitry diagrams, etc.

Haakon S.

Re: Drawing tool

Paul M Watt6-Jun-02 17:48

Paul M Watt

6-Jun-02 17:48

are you talking about path-finding techniques to find the shortest path without crossing over your other components in your diagram?

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Re: Drawing tool

Haakon S.6-Jun-02 18:54

Haakon S.

6-Jun-02 18:54

Yes, that is one essential feature.

Haakon S.

Re: Drawing tool

Paul M Watt6-Jun-02 19:45

Paul M Watt

6-Jun-02 19:45

I found a book called game programming gems that contains a whole set of AI to find those paths.

You may be able to find something on the internet or one of the game programming sites that has a code sample that will do this for you.

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Release mode TRACE?

clintsinger6-Jun-02 10:16

clintsinger

6-Jun-02 10:16

Is there a way to get the same effect as TRACE in debug mode but in release mode. I have a program that can trap the messages, I just need to know how to send those messages. It seems that AfxTrace and AtlTrace both disapear in release build.

Thanks,
Clint

Re: Release mode TRACE?

John M. Drescher6-Jun-02 10:15

John M. Drescher

6-Jun-02 10:15

clintsinger wrote:
AfxTrace and AtlTrace both disapear in release build

This is by design. Use OutputDebugString()

John

Re: Release mode TRACE?

clintsinger6-Jun-02 10:26

clintsinger

6-Jun-02 10:26

Thanks

Re: Release mode TRACE?

PJ Arends6-Jun-02 19:18

PJ Arends

6-Jun-02 19:18

http://codeguru.earthweb.com/debug/trace_to_file.shtml

---
CPUA 0x5041

Sonork 100.11743 Chicken Little

Within you lies the power for good - Use it!

custom control - how can you get mouse messages?

Cathy6-Jun-02 9:29

Cathy

6-Jun-02 9:29

I have a custom control but it doesn't get any mouse messages. I had the same problem with a static control and someone told me to check Notify and that fixed it.

Cathy

Life's uncertain, have dessert first!

Re: custom control - how can you get mouse messages?

Daniel Ferguson6-Jun-02 11:51

Daniel Ferguson

6-Jun-02 11:51

Have you subclassed a static control to make your custom control? If so, then the following code (I copied it out of MSDN) may help:

DWORD dwStyle = ::SetWindowLong(m_hWnd, GWL_STYLE);
if (!(dwStyle & SS_NOTIFY)) {
    // Turn on notify flag to get mouse messages and STN_CLICKED.
    // Otherwise, I'll never get any mouse clicks!
    ::SetWindowLong(m_hWnd, GWL_STYLE, dwStyle | SS_NOTIFY);
}

"The laws of nature, the laws of man
This volatile paradox will never stand"
-Plasticity, Front Line Assembly

Re: custom control - how can you get mouse messages?

Cathy6-Jun-02 11:59

Cathy

6-Jun-02 11:59

The SS_NOFIFY is a static control style. This one is just derived from CWnd. Any other ideas?

Cathy

Life's uncertain, have dessert first!

Re: custom control - how can you get mouse messages?

Daniel Ferguson6-Jun-02 15:10

Daniel Ferguson

6-Jun-02 15:10

If you use spy++ on your control window does it receive mouse messages?

"The laws of nature, the laws of man
This volatile paradox will never stand"
-Plasticity, Front Line Assembly

Re: custom control - how can you get mouse messages?

Cathy6-Jun-02 19:56

Cathy

6-Jun-02 19:56

Cathy

Life's uncertain, have dessert first!

Re: custom control - how can you get mouse messages?

aldeba8-Jun-02 21:55

aldeba

8-Jun-02 21:55

UINT CClass::OnNcHitTest(CPoint point)
{
return HTCLIENT;
//return CClass::OnNcHitTest(point);
}

i used this in a CStatic subclass, now u can just keep a look out for those mouse messages

hope this works.

Re: custom control - how can you get mouse messages?

Cathy9-Jun-02 6:35

Cathy

9-Jun-02 6:35

Thanks!

Cathy

Life's uncertain, have dessert first!

Multimap Error

Sidney6-Jun-02 9:11

Sidney

6-Jun-02 9:11

Hi everyone,

i tried to use the multimap(STL) but I got an error "fatal error: Cannot open include file: 'multimap' C++" I already installed the all the files that I got from sgi... STL Version 3.3, I installed it in "C:\Program Files\Microsoft Visual Studio\VC98\Include"

Here's my code:

#include <string>
#include <iostream>
#include <multimap>
using namespace std;

struct ltstr
{
bool operator()(const char* s1, const char* s2) const
{
return strcmp(s1, s2) < 0;
}
};

int main()
{
multimap<const char*,="" int,="" ltstr=""> m;

m.insert(pair<const char*="" const,="" int="">("a", 1));
m.insert(pair<const char*="" const,="" int="">("c", 2));
m.insert(pair<const char*="" const,="" int="">("b", 3));
m.insert(pair<const char*="" const,="" int="">("b", 4));
m.insert(pair<const char*="" const,="" int="">("a", 5));
m.insert(pair<const char*="" const,="" int="">("b", 6));

cout << "Number of elements with key a: " << m.count("a") << endl;
cout << "Number of elements with key b: " << m.count("b") << endl;
cout << "Number of elements with key c: " << m.count("c") << endl;

cout << "Elements in m: " << endl;
for (multimap<const char*,="" int,="" ltstr="">::iterator it = m.begin();
it != m.end();
++it)
cout << " [" << (*it).first << ", " << (*it).second << "]" << endl;
}

What could be the problem?

Thanks/Regards
Sidney

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