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How about delayed rendering in clipbord. I guess you can reuse same mechanizm?
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Thanks for that information! That was just what I needed. ![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
Found this useful article on CodeGuru:
http://www.codeguru.com/Cpp/W-P/clipboard/article.php/c3015/
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Hello and thanks for looking at my problem,
I want to both select some text and set the caret postion in a edit control as if the user clicked the mouse at the end of the text and then draws the mouse pointer towards the beginning of the text. When doing so, the caret position is somewhere in the middle of the text and everything behind it is selected, like this:
this is |some text
where the bold stuff is selected and the caret is the "|".
EM_SETSEL always results in selected text with the caret at its end, like this:
this is some text|
but I need the caret at the beginning. Does anyone know how to do?
Thanks a lot...
Martin Hoppe
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Reverse the starting and ending position arguments:
pCtrl->SendMessage(
EM_SETSEL, // message to send
(WPARAM) 10, // starting position
(LPARAM) 5 // ending position (caret postion)
);
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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Thanks a lot for your answer, Andrew!
Unfortunately I already tried that, but does NOT work. But maybe this is because I am on Embedded C++ 4.0? At least I am sure it does NOT work in Embedded C++ 4.0, but I will have a look in C++ 6.0 too.
Do you or anyone have a solution for eMbedded C++, too?.
Thank you very much...
Martin
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What about using EM_SETSEL with the beginning and the end at the same position?
Don't try it, just do it! 
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I am trying to use regular expressions in my application but I get these errors that I don't seem to be able to solve.
In the properties page of the Solution I have provided links to the Regex++ libraries and includes. My code is as follows (basically a copy of what is given as examples in the Regex documentation)
#include <boost/regex.hpp> <br />
<br />
using namespace boost; <br />
<br />
bool grep_callback(const match_results<wstring::const_iterator, regex::alloc_type>& result) <br />
{ <br />
return true;<br />
}
....
{ ...
wstring str_exp = L"[^\\\"]";
wstring expression = str_exp + *searchword + str_exp;
wregex e(expression);
wstring::const_iterator start = text.begin();
wstring::const_iterator end = text.end();
regex_grep(grep_callback, start, end, e, match_default);
}
Can anybody help me?
These are the errors I get:
c : \ B o o s t \ i n c l u d e \ b o o s t \ r e g e x \ v 4 \ r e g e x _ g r e p . h p p ( 5 2 ) : e r r o r C 2 6 6 4 : ' b o o l ( c o n s t b o o s t : : m a t c h _ r e s u l t s < B i d i I t e r a t o r , A l l o c a t o r > & ) ' : c a n n o t c o n v e r t p a r a m e t e r 1 f r o m ' b o o s t : : m a t c h _ r e s u l t s < B i d i I t e r a t o r > ' t o ' c o n s t b o o s t : : m a t c h _ r e s u l t s < B i d i I t e r a t o r , A l l o c a t o r > & '
w i t h
[
B i d i I t e r a t o r = s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r ,
A l l o c a t o r = b o o s t : : r e g _ e x p r e s s i o n < c h a r > : : a l l o c _ t y p e
]
a n d
[
B i d i I t e r a t o r = s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r
]
a n d
[
B i d i I t e r a t o r = s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r ,
A l l o c a t o r = b o o s t : : r e g _ e x p r e s s i o n < c h a r > : : a l l o c _ t y p e
]
R e a s o n : c a n n o t c o n v e r t f r o m ' b o o s t : : m a t c h _ r e s u l t s < B i d i I t e r a t o r > ' t o ' c o n s t b o o s t : : m a t c h _ r e s u l t s < B i d i I t e r a t o r , A l l o c a t o r > '
w i t h
[
B i d i I t e r a t o r = s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r
]
a n d
[
B i d i I t e r a t o r = s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r,
A l l o c a t o r = b o o s t : : r e g _ e x p r e s s i o n < c h a r > : : a l l o c _ t y p e
]
N o c o n s t r u c t o r c o u l d t a k e t h e s o u r c e t y p e , o r c o n s t r u c t o r o v e r l o a d r e s o l u t i o n w a s a m b i g u o u s
c : \ C + + P r o g r a m s \ C C M e t r i c V i e w e r \ W o r d S e a r c h e r . c p p ( 1 0 8 ) : s e e r e f e r e n c e t o f u n c t i o n t e m p l a t e i n s t a n t i a t i o n ' u n s i g n e d i n t b o o s t : : r e g e x _ g r e p < b o o l ( _ _ c d e c l * ) ( c o n s t b o o s t : : m a t c h _ r e s u l t s < B i d i I t e r a t o r , A l l o c a t o r > & ) , s t d : : b a s i c _ s t r i n g < _ E l e m , _ T r a i t s , _ A x > : : c o n s t _ i t e r a t o r , c h a r T , t r a i t s , s t d : : a l l o c a t o r < _ T y > > ( P r e d i c a t e , B i d i I t e r a t o r , B i d i I t e r a t o r , c o n s t b o o s t : : r e g _ e x p r e s s i o n < c h a r T , t r a i t s , s t d : : a l l o c a t o r < _ T y > > & , b o o s t : : r e g e x _ c o n s t a n t s : : m a t c h _ f l a g _ t y p e ) ' b e i n g c o m p i l e d
w i t h
[
B i d i I t e r a t o r = s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r ,
A l l o c a t o r = b o o s t : : r e g _ e x p r e s s i o n < c h a r > : : a l l o c _ t y p e ,
_ E l e m = w c h a r _ t ,
_ T r a i t s = s t d : : c h a r _ t r a i t s < w c h a r _ t > ,
_ A x = s t d : : a l l o c a t o r < w c h a r _ t >,
c h a r T = w c h a r _ t ,
t r a i t s = b o o s t : : r e g e x _ t r a i t s < w c h a r _ t > ,
_ T y = w c h a r _ t ,
P r e d i c a t e = b o o l ( _ _ c d e c l * ) ( c o n s t b o o s t : : m a t c h _ r e s u l t s < s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r , b o o s t : : r e g _ e x p r e s s i o n < c h a r > : : a l l o c _ t y p e > & )
]
c : \ B o o s t \ i n c l u d e \ b o o s t \ r e g e x \ v 4 \ r e g e x _ g r e p . h p p ( 6 7 ) : e r r o r C 2 6 6 4 : ' b o o l ( c o n s t b o o s t : : m a t c h _ r e s u l t s < B i d i I t e r a t o r , A l l o c a t o r > & ) ' : c a n n o t c o n v e r t p a r a m e t e r 1 f r o m ' b o o s t : : m a t c h _ r e s u l t s < B i d i I t e r a t o r > ' t o ' c o n s t b o o s t : : m a t c h _ r e s u l t s < B i d i I t e r a t o r , A l l o c a t o r > & '
w i t h
[
B i d i I t e r a t o r = s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r ,
A l l o c a t o r = b o o s t : : r e g _ e x p r e s s i o n < c h a r > : : a l l o c _ t y p e
]
a n d
[
B i d i I t e r a t o r = s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r
]
a n d
[
B i d i I t e r a t o r = s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r ,
A l l o c a t o r = b o o s t : : r e g _ e x p r e s s i o n < c h a r > : : a l l o c _ t y p e
]
R e a s o n : c a n n o t c o n v e r t f r o m ' b o o s t : : m a t c h _ r e s u l t s < B i d i I t e r a t o r > ' t o ' c o n s t b o o s t : : m a t c h _ r e s u l t s < B i d i I t e r a t o r , A l l o c a t o r > '
w i t h
[
B i d i I t e r a t o r = s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r
]
a n d
[
B i d i I t e r a t o r = s t d : : b a s i c _ s t r i n g < w c h a r _ t , s t d : : c h a r _ t r a i t s < w c h a r _ t > , s t d : : a l l o c a t o r < w c h a r _ t > > : : c o n s t _ i t e r a t o r ,
A l l o c a t o r = b o o s t : : r e g _ e x p r e s s i o n < c h a r > : : a l l o c _ t y p e
]
N o c o n s t r u c t o r c o u l d t a k e t h e s o u r c e t y p e , o r c o n s t r u c t o r o v e r l o a d r e s o l u t i o n w a s a m b i g u o u s
I am the handsome one in the crowd.
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My application is based on the SDI with the splitter view.The left view is derived of a common class CView which is used to show the vector graphics and the right view is derived of a class CFormview.Now ,I want to show the full vector graphics in the left view but the full vector graphics is so large that canot be showed .So I think it may called "zoom the graphics". How can I do?
Also I donot plan to use the HScroll and VScroll th show the graphics.
Thank you.
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Use StretchBlt() or use GDI mapping functions like SetViewportExt() and ScaleViewportExt().
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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Hi there
I'm getting loads of link errors when trying to run this OpenGl with Glui program on Visual C++ .net 2003, but not in Visual Studio C++ 6.
error LNK2001: unresolved external symbol "__declspec(dllimport) bool __cdecl std::operator==(class std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> > const &,char const *)" (__imp_??8std@@YA_NABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@PBD@Z)
I've included all the necessary .lib files in the Linker tab of Project properties, opengl32.lib, glut32.lib, glu32.lib and glui32.lib. Also I've ticked include MFC in shared dll. My glut.h, glu.h and glui.h header files are in the PlatformSDK/include/gl directory and glut32.dll is in c:/Windows/system directroy so I don't know what the problem is. Can anyone help me?
Thanks
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I have an app with a CFrameWnd (SDI), a CPropertySheet with several CPropertyPages in it. Any time the user switches to another app on the computer and returns to my app the focus, which was in a control on the proppage, is lost.
If using a CDialog as the parent of the sheet and props anything is fine only the main frame seems to cause the problem.
Has anyone any suggestions how the problem can be solved?
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Why on in CFrameWnd you wouldn't rout fosus to the view/CPropertySheet/CPropertyPage (ActivePage)
You can get view from frame and set on view focus to any control.
I guess when frame gets focus back it don't remembers what control on the view was active.
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Thanks for your help, but I guess I havn't got it right.
How do I know after returning which control has had the focus before? Is this stored somewhere in a CWnd object?
Do I have to call OnSetFocus() ( via SetFocus()) for all the windows ( CFrameWnd -> CView -> CPropertySheet -> CPropertyPage )? This is what I have done but that hasn't worked right. The only positive effect was that I coould set the focus on the first control on the page.
Some further help would be appreciated.
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If you not keep information where focus was, nobody will do it for you. You can keep information obdatined from OnKillFocus(...) Why is so important to have focus on particar control. Why not set focus on View or PropSheet if you want. Unless while you was in other app, programmaticaly PropPage switched to another page and you want switch it back when focus will be set to your app. Other than that I don't know.
Anyway you as the developer need to deside preserve focus or not.
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Hi everybody!
Im trying to develop an application to control my webcam using DirectShow instead of Video for Windows. Everything works ok, I mean, I connect the driver of the camera and I can see the image of the webcam. But what I haven´t been able to do is capturing a still image. The problem is the following instruction:
IPin *pPin = 0;
hr = pBuild->FindPin(pCap, PINDIR_OUTPUT, &PIN_CATEGORY_STILL, 0,
FALSE, 0, &pPin);
Where "pCap" is a IBaseFilter intarface, and it controls the capture, and "pBuild" is a "ICaptureGraphBuilder2" interface. With this instruction, I get this error: "E_FAIL".
Ive been reading the specifications of my webcam (Creative NX PRO) and it has support for DirectShow. It also has a button that allows to take photos using hardware trigger (thats why I suppouse that it has a "Pin_Category_Still").
If anybody knows any other way to take a photo, please tell me.
I appreciate any idea you can tell me about it.
Thank you very much for your help!
PerroFlaco
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Have you been able to get it to work in GraphEdit? Play around with it there and see what pins go where and then you can easily translate it into code.
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I don't even know that GraphEdit exits!  . Ill take a look and see what happens. By the way, can you see what PIN are available using GraphEdit? I hope this help me to solve this problem.
Thanks Mark!
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GraphEdit comes with the DirectX SDK, so you should already have it. It will show all filters and all pins, you drag connections between then and then play it. It's very helpful for trying out things out quickly in DirectX. If you can get it to work in GraphEdit that's a big step, then you just get your code to look like the graph.
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The filter graph itself does not provide a still capture pin. The FindPin method does search the filter graph for any still capture pin (in this case), but if there is none, it will return E_FAIL.
Try to connect a filter that does have a still capture pin.
Don't try it, just do it!
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Ok, but, how can I find a filter that have a still capture pin? I dont know how to do it. I have been looking for it in the "msdn" help, but I have not found anything at all 
Please help! .
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hiho@ll
first i have to say i need to solve this problem using linux, but i think it's a more c++ related question than linux
what i need:
explanation: i know that templates can generalize the datatype used for a class
so the class can work with an int, string, char, pointers
simply with different data types
my problem is something similar
i need a template for instaniating a class
this means, i want a configuration file, which says which class i need to use for the job i have to do
something like a string to object converter
i thought about make a abstract class and inherit from this and instantiate the needed class using the string
but the point is, i don't know how (or if this is possible) instantiate a object where the only knowledge of which object type to use is my configuration string
i hope it's understandable
greet@ll
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ThinkingPrometheus wrote:
first i have to say i need to solve this problem using linux, but i think it's a more c++ related question than linux
...
the point is, i don't know how (or if this is possible) instantiate a object where the only knowledge of which object type to use is my configuration string
It's not a C++ related question. You need to use C# or Java (Class.forName(..)) to do that. 
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The typical C++ approach to this would be like so:
1. Create an abstract base class that defined the interface common to all classes that might be instantiated with this mechanism. Assuming the popular musical example, make this base class an "Instrument" and give it virtual methods like "Play", "Tune", "ThrowAway", etc.
2. Create all classes that need instantiating so, and make sure they all derive from this base class: Flute, Piano, Viola, etc.
3. Read your configuration file, and evaluate it using a simple (or powerful) parser, like so:
<br />
Instrument* parse(const char* word) {<br />
Instrument* result = NULL;<br />
if (!strcmp(word, "Flute")) {<br />
Instrument = new Flute();<br />
} else if (!strcmp(word, "Viola")) {<br />
Instrument = new Viola();<br />
} else ...<br />
...<br />
}<br />
return Instrument;<br />
}<br />
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Hello,
Since you mention templates, I have to say the following. Templates take advantage of the symantics between objects. For example, all the operations they perform on the objects, is the same for every valid type that you can pass in the template specification.
You canno't do something like this at runtime like you can do with templates. You can mimic this behaviour by creating a "typeless" variable type like class CVar{/*...*/}; This type can be any type you want, like the VARIANT type used in scripting.
If the class that you need to create is always the same, but with other variable types, you can do something like the typeless variable above. I think that you need that, since you mentioned templates.
If you need to construct different classes with different behaviour, the inheritance / interface solution, that an other CPian already posted, is the way to go.
Behind every great black man...
... is the police. - Conspiracy brother
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