C / C++ / MFC Discussion Boards

Member 7383649-Jan-04 18:54

9-Jan-04 18:54

I have created a program in VC++(MFC programming) using ListCtrl and MSFlexGrid control(This both have pasted in separate Views). I want to move the focus from ListCtrl to MSFlexGrid control and vice versa. Will anyone help me how to set the focus from List control to MSFlexGrid control.

Ramanan.

Re: Setting focus on the control

Prakash Nadar10-Jan-04 1:06

Prakash Nadar

10-Jan-04 1:06

You need the a handle to both the items in one place and them simply say SetFocus.

I Touched Osama Bin Ladens Bushy Beard

Re: Setting focus on the control

Ernesto D.10-Jan-04 15:01

Ernesto D.

10-Jan-04 15:01

Have you tried the SetFocus() member functions for their respective CWnd-derived control wrappers?
i dont think MsFlexGrid has a CWnd derived wrapper, so you could simply send it a WM_SETFOCUS msg.

HTH

File Size

picasso29-Jan-04 18:01

picasso2

9-Jan-04 18:01

How can I read the file size and based on the size an action will be triggered?
C++/VC++
Any help will be greatly appreciated

Re: File Size

Jijo.Raj9-Jan-04 18:44

Jijo.Raj

9-Jan-04 18:44

Getting file length:-

DWORD length;
CFile file;

file.Open ("c:\\myfile.dat", CFile::modeRead | CFile::shareDenyNone );
length = file.GetLength (); // Will give you the file length.

Simple... isn't it ? Wink | ;)

Regards,
Jijo.

Yesterday is history,
Tomorrow is a mystery,
But today is a present.

Re: File Size

2249179-Jan-04 21:15

224917

9-Jan-04 21:15

Are you looking to execute your code if file size is changed by some other user or application ??

greatest thing is to do wot others think you cant Smile | :)

suhredayan@omniquad.com

Re: File Size

Anonymous11-Jan-04 18:57

Anonymous

11-Jan-04 18:57

When the file gets to certain size I will run another application

Re: File Size

Amit Dey10-Jan-04 5:51

Amit Dey

10-Jan-04 5:51

GetFileSize() OMG | :OMG:

Hush,hush...
thought I heard you call my name now.

Kula Shaker.

Amit Dey
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Windows Messages and Pixel colors..

__Cerb9-Jan-04 17:32

__Cerb

9-Jan-04 17:32

Is it possible to grab a certain pixel's color using WM messages?

If so, which WM should I send and what kind of wParam and lParam would I need to send?

Thanks,

~Mike

Re: Windows Messages and Pixel colors..

Hesham Amin10-Jan-04 1:00

Hesham Amin

10-Jan-04 1:00

you can use GetPixel

COLORREF GetPixel(<br />
  HDC hdc,    // handle to DC<br />
  int nXPos,  // x-coordinate of pixel<br />
  int nYPos   // y-coordinate of pixel<br />
);

why do you need SendMessage ?

Re: Windows Messages and Pixel colors..

__Cerb10-Jan-04 3:10

__Cerb

10-Jan-04 3:10

Because I need to retrieve pixel colors from an inactive window..

Is it possible?

Thanks
~Mike

Re: Windows Messages and Pixel colors..

Hesham Amin10-Jan-04 4:34

Hesham Amin

10-Jan-04 4:34

__Cerb wrote:
Is it possible?

not sure...
an inactive window isn't drawn!! .. needs to get the wm_paint to be redrawn..

Re: Windows Messages and Pixel colors..

__Cerb10-Jan-04 5:33

__Cerb

10-Jan-04 5:33

What about ::GetDC(HWND hwnd) and ::ScreenToClient(HWND hwnd, LPPOINT lpPoint)

???

is there a way I could use those to get a pixel color?

Re: Windows Messages and Pixel colors..

__Cerb10-Jan-04 7:05

__Cerb

10-Jan-04 7:05

Do I need to use ::GetDC, ::GetWindowDC, ::ScreenToClient, ::BitBlt, I really need to figure out how can I retrieve a pixel color from an inactive window.

Thanks a lot, any help greatly appreciated

~Cerb

Re: Windows Messages and Pixel colors..

Hesham Amin10-Jan-04 7:57

Hesham Amin

10-Jan-04 7:57

if you have the window handle then use GetWindowDC to get the HDC (device context)
then use GetPixel directly...
but the problem is when the window needs repaint.. in this case it amy give you another color,,,
try this first and let us know the results Smile | :)

Re: Windows Messages and Pixel colors..

__Cerb10-Jan-04 8:33

__Cerb

10-Jan-04 8:33

Damn, it still won't work.

	CString szWndName,szWndClass;<br />
<br />
	szWndName = "My window";<br />
	szWndClass = "My window's class";<br />
<br />
	HWND hwnd = ::FindWindow(szWndName,szWndClass);<br />
<br />
	::PostMessage(hwnd,WM_PAINT,0,0);<br />
	HDC hDC = ::GetWindowDC(hwnd);<br />
<br />
	CString str;<br />
	int iPixel;<br />
<br />
	iPixel = ::GetPixel(hDC,50,75);<br />
<br />
	str.Format("%d",iPixel);<br />
	AfxMessageBox(str);

It keeps returning -1, and it should return 263172

Any ideas?

Re: Windows Messages and Pixel colors..

__Cerb10-Jan-04 10:22

__Cerb

10-Jan-04 10:22

Help please?

Re: Windows Messages and Pixel colors..

Hesham Amin10-Jan-04 21:01

Hesham Amin

10-Jan-04 21:01

can you tell me what is the purpose of this operation ?
maybe wecan find a way around it...
why do you need to get the color of an in-active window ?

Flexgrid

Rane9-Jan-04 17:30

Rane

9-Jan-04 17:30

I created a program using vc to display the Records in the
console.Now I wanted to display the records in windows.

I am using only Win32Api,not MFC's CRecordset...
Will anyone say how to include the flexgrid control in my
Program by using only Win32 API(plz write 1 or 2 lines
of sample code)

map<string,string> just won't work

luddet9-Jan-04 16:47

luddet

9-Jan-04 16:47

Hi,

I've banged my forehead against this problem for several hours now and I cant' for the life of me figure out why this doesn't work.

All I'm trying to do is use a std::map as a dictionary, like: map<string,string>

Here's the very simple code that just won't work:

#include <map>
using namespace std;

int main(int argc, char* argv[]) {

map<string, string> m;
m["a"] = "b";

return 0;
}

I'm getting these error messages:
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'const std::string'
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2676: binary '<' : 'const std::string' does not define this operator or a conversion to a type acceptable to the predefined operator
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::_Ptrit<_Ty,_Diff,_Pointer2,_Reference2,_Pointer2,_Reference2> &,const std::_Ptrit<_Ty,_Diff,_Pointer,_Reference,_Pointer2,_Reference2> &)' : could not deduce template argument for 'const std::_Ptrit<_Ty,_Diff,_Pointer2,_Reference2,_Pointer2,_Reference2> &' from 'const std::string'
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::_Ptrit<_Ty,_Diff,_Pointer2,_Reference2,_Pointer2,_Reference2> &,const std::_Ptrit<_Ty,_Diff,_Pointer,_Reference,_Pointer2,_Reference2> &)' : could not deduce template argument for 'const std::_Ptrit<_Ty,_Diff,_Pointer2,_Reference2,_Pointer2,_Reference2> &' from 'const std::string'
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::_Ptrit<_Ty,_Diff,_Pointer2,_Reference2,_Pointer2,_Reference2> &,const std::_Ptrit<_Ty,_Diff,_Pointer,_Reference,_Pointer2,_Reference2> &)' : could not deduce template argument for 'const std::_Ptrit<_Ty,_Diff,_Pointer2,_Reference2,_Pointer2,_Reference2> &' from 'const std::string'
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const std::string'
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const std::string'
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const std::string'
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'const std::string'
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'const std::string'
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'const std::string'
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'const std::string'
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'const std::string'

If I change the key to int, like this:
map<int,string> m;
there's no problem doing this:
m[6] = "ashahshd";

But the map<string,string> just won't work.

Please help me, I'm getting desperate!

thanks
Ludde

Re: map<string,string> just won't work

ZoogieZork9-Jan-04 17:14

ZoogieZork

9-Jan-04 17:14

luddet wrote:
c:\Program\Microsoft Visual Studio .NET\Vc7\include\functional(139): error C2676: binary '<' : 'const std::string' does not define this operator or a conversion to a type acceptable to the predefined operator

This is the key part. There's no operator< defined for std::string. You can either define an operator for it yourself, or (better for strings) use a hash_map instead of a map (in this case you may have to define a hash function for std::string).

- Mike

Re: map<string,string> just won't work

luddet9-Jan-04 17:17

luddet

9-Jan-04 17:17

Hi,

Are you absolutely sure that there is no operator

Re: map<string,string> just won't work

ZoogieZork9-Jan-04 17:50

ZoogieZork

9-Jan-04 17:50

Oops, yeah, I missed that. No more trying to answer questions when I'm dead tired Smile | :)

- Mike

Re: map<string,string> just won't work

luddet9-Jan-04 17:53

luddet

9-Jan-04 17:53

And I missed to include <string>. No more trying to program when I'm dead tired Smile | :)

/Ludde

Re: map<string,string> just won't work

Garth J Lancaster9-Jan-04 17:18

Garth J Lancaster

9-Jan-04 17:18

I'm not near a compiler at the moment (sigh, Its Saturday here in Aus and Im in the computer-room), but I think you have to declare the map elements ...

try :-

// Declare A Map Of string->string
map<string, const string> m;

(The 'const' may/may not be required).... I've never had much luck doing an insert like you've tried - I always use 'make_pair' (usually becuase I have an object pointer on the right hand side) as in :-

m.insert ( make_pair ( "Tom", "Jerry" ) );

'G'

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