map<string,string> just won't work - C / C++ / MFC Discussion Boards

__Cerb10-Jan-04 5:33

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'

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

luddet9-Jan-04 17:19

luddet

9-Jan-04 17:19

Hmmm...
I've tried the make_pair too, and it doesn't work either Frown | :(

thanks
Ludde

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

Jörgen Sigvardsson10-Jan-04 7:20

Jörgen Sigvardsson

10-Jan-04 7:20

If you make the mapped_type const, then the map is rather unusable. Nor should you make the key_type const either, since std::map will make the key const where appropriate.

--
If there was a problem, Yo, I'll solve it!
Check out the hook while my DJ revolves it.

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

Garth J Lancaster11-Jan-04 16:00

Garth J Lancaster

11-Jan-04 16:00

yeah, I was having a brain-fart at the time I wrote that ... it was so bloody cold in the computer room I was surprised I could type at all !!

Jörgen Sigvardsson wrote:
Nor should you make the key_type const either, since std::map will make the key const where appropriate.

hmmm - but wouldnt you keep it const ?? - I thought it would be appropriate all the time ... I always thought of the key being const

map<string, string> m;
m["Fred"] = "Nurk";

I can understand changing "Nurk" to "Scumbag".. Im not sure on the implications of changing the "Fred" Key ..

I must still be in "mode=dense"
'G'

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

Jörgen Sigvardsson11-Jan-04 23:29

Jörgen Sigvardsson

11-Jan-04 23:29

Garth J Lancaster wrote:
hmmm - but wouldnt you keep it const ?? - I thought it would be appropriate all the time ... I always thought of the key being const

Yes, but std::map does that for you. If you look at all interface points of the map container, it'll make sure no keys are mutated. Check out map::value_type and you'll see.

--
I am perpetual, I keep the country clean.

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

Michael Dunn9-Jan-04 17:20

Michael Dunn

9-Jan-04 17:20

You need to #include <string> for the compiler to know the contents of the string class.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0! | RightClick-Encrypt
There is a saying in statistics that a million monkeys pounding on typewriters would eventually create a work of Shakespeare. Thanks to the Internet, we now know that this is not true.

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

Garth J Lancaster9-Jan-04 17:24

Garth J Lancaster

9-Jan-04 17:24

nice one Mike - I missed the bleeding obvious !
sigh .. wish this server would hurry up so I can get outta here - it s f_ing freezing !!

'G'

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

luddet9-Jan-04 17:24

luddet

9-Jan-04 17:24

hmmm...

this is most humiliating... Wink | ;)

so simple

I could have sworn I had included it!

dang!

*bangs his head against the wall*

Thank you very much!!

regards
/Ludde

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

Prakash Nadar10-Jan-04 1:02

Prakash Nadar

10-Jan-04 1:02

Hi,
I saw a long list of answers to this query and one from micheal dunn, when i read the question i knew and was obvious that you have missed to include the string, and for some reason before reading all the answers i knew the rite one will come from Mike, and so it was Smile | :)

I Touched Osama Bin Ladens Bushy Beard

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

Jörgen Sigvardsson10-Jan-04 7:30

Jörgen Sigvardsson

10-Jan-04 7:30

But how could he create a std::map<int, std::string>..? Confused | :confused:

--
If there was a problem, Yo, I'll solve it!
Check out the hook while my DJ revolves it.

shortcut using installshield

Anonymous9-Jan-04 12:56

Anonymous

9-Jan-04 12:56

i have packaged an VC++ created EXE and created a shortcut for it using InstallShield . Now when i launch the shortcut from the start menu , the application comes up but gives a message saying it cannot find an INI file which is located in the same folder as the EXE .

Now if i run the EXE directly from the folder it works fine .

In my code the reference to the INI file is a "./MyInIFile.ini !

How do i resolve this ?

Re: shortcut using installshield

Stefan Pedersen9-Jan-04 13:53

Stefan Pedersen

9-Jan-04 13:53

Set the "Start in" property of the shortcut.
Or:
Save a INSTALLDIR key to the registry and load the ini relative to that instead of current dir.

(I would prefer method 2, it's not as sensitive to "users" as method 1)

And if the paths that I have followed/have tread against the flow/there is no need for sorrow
I am coming home
Return, Crüxshadows

CATEGORYINFO & ICatRegister

suiram409-Jan-04 11:25

suiram40

9-Jan-04 11:25

I try to register a categoty using ATL/COM
After registering the registry looks pretty OK.
OleView diaplays the categoty
In Left Tree Pane: Grouped by Ccategory (child tree list)
I cannot se muy category, but in detailed right pane list-view
I can see my category beeing there.
The bad thing is when I enumerate the category info
I cannot find it.
All COM calls returrn S_OK;

// here Is the registration code
--------------------------------------------------
USES_CONVERSION;

CComPtr<icatregister> catInfo;
HRESULT hr = catInfo.CoCreateInstance(CLSID_StdComponentCategoriesMgr);
if(FAILED(hr))return hr;

// ensure the category registration
CATEGORYINFO catinfo;
catinfo.catid = MY_CATID;
catinfo.lcid = 0x0409 ;
::wcscpy(catinfo.szDescription, T2W (catDescription));
catInfo->RegisterCategories(1, &catinfo);

CComPtr<icatregister> catInfo;
HRESULT hr = catInfo.CoCreateInstance(CLSID_StdComponentCategoriesMgr);
if(FAILED(hr))return hr;

CATID catid = catidIn;
catInfo->RegisterClassImplCategories(CLSID_MyDLL,1,&catid);

// here is the enumaration code
--------------------------------------------------
CComPtr<icatinformation> ci;
HRESULT hr = ci.CoCreateInstance(CLSID_StdComponentCategoriesMgr);
if(FAILED(hr)) return;
CComPtr<ienumcategoryinfo> spEci;

if(SUCCEEDED(ci->EnumCategories(GetUserDefaultLCID(), &spEci)))
{
ULONG nRet = 0;
CATEGORYINFO cif;

while(SUCCEEDED(spEci->Next(1,&cif,&nRet)) && nRet==1)
{
if (cif.catid == NY_CATID)
{
TRACE("found \r\n");
}
}
}

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