Window Handle from CreateWindow will colse itself when thread exit? - C / C++ / MFC Discussion Boards

RaymondM25-Jan-09 21:52

25-Jan-09 21:52

I am trying to include AddFontResourceEx(Fontname,FR_PRIVATE,0); but get the error message that the function and FR_PRIVATE are undefined. Of course I have wingdi.h in the opening lines :

#define UNICODE // Save as Unicode -Codepage 1200
#include <windows.h>;
#include <wingdi.h>;

The error is produced when I try to compile.

I have added gdi32.lib to the command line.
What am I supposed to do about gdi32.dll ?

Thanks for any help

Raymond Mercier

Re: AddFontResourceEx

RaymondM25-Jan-09 21:53

RaymondM

25-Jan-09 21:53

Sorry, this failed to appear !

#define UNICODE // Save as Unicode -Codepage 1200
#include <windows.h>
#include <Winbase.h>
#include <WinGDI.h>

Re: AddFontResourceEx

Randor 26-Jan-09 17:22

Randor

26-Jan-09 17:22

You need to install the Platform SDK[^] or Windows SDK[^].

Which SDK is Right for Me?[^]

Best Wishes,
-David Delaune

Re: AddFontResourceEx

RaymondM26-Jan-09 19:13

RaymondM

26-Jan-09 19:13

Thanks for the tip, but I should have mentioned that I have been compiling with VS 6 with Net Framework 1.1.
Meanwhile I have managed (sort of) with these lines, which do allow me to get the function.
I still fail to see why I have to go through all this, but not for AddFontResource,
and I still have to put 0x10, since FR_PRIVATE is not recognized.

static FARPROC fpAddFontRes,fpRemoveFontRes;
HMODULE hLibrary;

hLibrary=LoadLibraryW(L"gdi32.dll");
fpAddFontRes=GetProcAddress(hLibrary,(LPCSTR)"AddFontResourceExW");
fpRemoveFontRes=GetProcAddress(hLibrary,(LPCSTR)"RemoveFontResourceExW");
.....
nFontLoad=(*fpAddFontRes)(Bact,0x10,0);

At least this works fine !

Raymond Mercier

Re: AddFontResourceEx [modified]

Randor 26-Jan-09 21:09

Randor

26-Jan-09 21:09

RaymondM wrote:
Thanks for the tip, but I should have mentioned that I have been compiling with VS 6 with Net Framework 1.1.

My recommendation remains the same. The updated headers are included with the Platform SDK. You can use the Platform SDK with VC6. I have a copy of VC6 installed along-side several versions of the Platform SDK. I can't believe that you went this many years without it.

The LoadLibrary/GetProcAddress technique will also work if you choose to do it that way. But the next time you try to use a new GDI enum/constant or data type you might be back in the same boat.

RaymondM wrote:
I still fail to see why I have to go through all this, but not for AddFontResource

AddFontResource[^] was included in the VC6 header distribution. AddFontResourceEx [^]is available in Windows 2000 and above and the header file was updated in the Platform SDK.

The declaration for AddFontResourceEx [^]is preceeded by:

#if (_WIN32_WINNT >= _WIN32_WINNT_WIN2K)

So you would need:

1.) A header file with the AddFontResourceEx declaration.
2.) Declare a windows version greater or equal to _WIN32_WINNT_WIN2K.

Best Wishes,
-David Delaune

modified on Tuesday, January 27, 2009 3:19 AM

Re: AddFontResourceEx

RaymondM27-Jan-09 4:47

RaymondM

27-Jan-09 4:47

>>"I can't believe that you went this many years without it" (PlatformSDK).

I don't know why you think that I do not already have the headers, since they come with the full installation of Microsoft Visual Studio .NET 2003, including its PlatformSDK.

In wingdi.h I find the condition
_WIN32_WINNT >= 0x0500, which is obviously satisfied in the XP that I am using.

From
I see that for XP _WIN32_WINNT = 501

So I only need to add #define _WIN32_WINNT 501 before windows.h, and then I can call the function I need. That is of course the only point that I had overlooked.

Raymond Mercier

Re: AddFontResourceEx

Randor 27-Jan-09 7:52

Randor

27-Jan-09 7:52

RaymondM wrote:
I don't know why you think that I do not already have the headers

Because you told me that you were compiling the project with VC6.

RaymondM wrote:

So I only need to add #define _WIN32_WINNT 501 before windows.h, and then I can call the function I need. That is of course the only point that I had overlooked.

Exactly what I stated in my last response. I am happy to hear that you have corrected the problem.

Best Wishes,
-David Delaune

Window Handle from CreateWindow will colse itself when thread exit?

fitatc25-Jan-09 21:33

fitatc

25-Jan-09 21:33

first, the MSDN about CreateWindow() not mention of close the handle of window it returns.
Confused | :confused:

is it means that we donnot need to care about it?(Sorry about the title if it is true)

second, I test of this in the code like this

HWND hWnd;
unsigned __stdcall SecondThreadFunc( void* pArguments )
{
hWnd = CreateWindow(
			 L"BUTTON"
			,L"dmyWnd"
			,WS_DISABLED
			,CW_USEDEFAULT
			,CW_USEDEFAULT
			,0
			,0
			,NULL
			,NULL
			,::AfxGetInstanceHandle()
			,NULL
			);
        while( (bRet = GetMessage( &msg, NULL, 0, 0 )) != 0)
	{ 
		if (bRet == -1)
		{
			// handle the error and possibly exit
			TRACE(L"[Thread] ERROR\n");
		}
		else
		{
			TranslateMessage(&msg); 
			DispatchMessage(&msg); 
		}
	}
	return 0;
} 

_beginthreadex( NULL, 0, &SecondThreadFunc, NULL, 0, &threadID ); // called by MainThread

I try to call

int nRt = ::GetWindowText(hWnd, cs, 256);

before and after I

::PostThreadMessage(threadID, WM_QUIT, 0, 0);

to end the thread.
The result is sccess when thread alive and invalid handle when thread exit.

Confused | :confused:

I am not sure if this can prove that window handle is be safely closed.Could any one tell me
that is it true "Window Handle from CreateWindow will colse itself when thread exit"

Re: Window Handle from CreateWindow will colse itself when thread exit?

Stuart Dootson25-Jan-09 21:55

Stuart Dootson

25-Jan-09 21:55

fitatc wrote:
Could any one tell me
that is it true "Window Handle from CreateWindow will colse itself when thread exit"

No, not necessarily - it'll be because the thread's has gone. GetWindowText performs a SendMessage of WM_GETTEXT to the window you want. SendMessage to a window owned by another thread means switching to the thread and calling the window's WndProc. If the thread no longer exists, that's not possible, so the function returns an error.

Re: Window Handle from CreateWindow will colse itself when thread exit?

Stephen Hewitt26-Jan-09 0:33

Stephen Hewitt

26-Jan-09 0:33

To a certain extent windows (HWNDs) belong to the thread that created them. For example, the thread that created the window is the thread that pumps its messages. See Thread affinity of user interface objects, part 1: Window handles[^] for deatils. It doesn't make sense to create a window with a thread and then let it outlive its parent thread.

Steve

Re: Window Handle from CreateWindow will colse itself when thread exit?

Randor 26-Jan-09 13:27

Randor

26-Jan-09 13:27

Hi,

fitatc wrote:

I am not sure if this can prove that window handle is be safely closed.Could any one tell me

User applications do not manage window handles. To be more specific your application does not create/destroy or manage windows directly. The windows kernel does all of this for you when you request it.

There is a device driver named 'Win32k.sys' which through ntdll.dll creates and manages the window for you. when you make a call to CreateWindow it ultimately passes through VerNtUserCreateWindowEx then ZwUserCreateWindowEx and your window is created. Event messages are then placed in the message que associated with the window. At this point your application can retrieve these messages and react to them.

If you don't understand anything I just said... just remember that you do not need to close window handles.

Best Wishes,
-David Delaune

Re: Window Handle from CreateWindow will colse itself when thread exit?

fitatc26-Jan-09 13:46

fitatc

26-Jan-09 13:46

Thank you very much, that just the answer what I need!!! Big Grin | :-D

Show/Hide part of a CView / CFormView

swarnalucky25-Jan-09 20:17

swarnalucky

25-Jan-09 20:17

HI,

I am having a CView which has some controls, i would like my top part(1/3rd portion) of the view to be hidden dynamically when ever i press some button.
How do i go about.

Re: Show/Hide part of a CView / CFormView

SutterA25-Jan-09 22:05

SutterA

25-Jan-09 22:05

Hi,

well, I would write a function with

GetDlgItem(IDC_MYCONTROL)->ShowWindow(SW_HIDE);

for each of your controls.

That should do what you want.

Re: Show/Hide part of a CView / CFormView

swarnalucky26-Jan-09 3:49

swarnalucky

26-Jan-09 3:49

HI, thanks for the reply...this would actually just hide the controls, but i would like my bottom part of the view to be shifted to top.....

Re: Show/Hide part of a CView / CFormView

SelvaKr26-Jan-09 14:34

SelvaKr

26-Jan-09 14:34

Try Splitter windows.. You can get lot of articles in CP..

Selva

Re: Show/Hide part of a CView / CFormView

SutterA2-Feb-09 23:15

SutterA

2-Feb-09 23:15

Hi, if your problem is not solved yet have a look at this article[^]

If you combine this with moving your controls with

GetDlgItem(IDC_MYCTRL)->SetWindowPos();

you should be fine.

Design Data structure.

mikert_200825-Jan-09 20:10

mikert_2008

25-Jan-09 20:10

Hi,
I want to constuct a data structure with following condition-

The first structure is having 3 element e.g Name1 ,age1 ,roll no1.
The second structure contain the 3 element i.e roll no 1, subject 1
roll no 1, subject 2
roll no 1, subject 3

i.e Roll no may have one or more than one subject associated with it. I want to write a program which will take input as Name,Age, Roll No ,subject(no.of subjects may very).
Then I will take Input from user As Roll No, Query the structure and display name,age and subject/s.
Can you please suggest which data structure (CMAp,CList... etc.) is suatiable for such condition?

Thanks:-
Mike

Re: Design Data structure.

David Crow26-Jan-09 2:52

David Crow

26-Jan-09 2:52

Something like:

struct
{
    string name;
    int age;
    int roll;
    vector<string> subjects;
};

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: Design Data structure.

mikert_200826-Jan-09 16:59

mikert_2008

26-Jan-09 16:59

hi,

Thanks.

-Mike

Displaying Symbol issue.........

shaina223125-Jan-09 18:52

shaina2231

25-Jan-09 18:52

need some help to use Ω (ohm Symbol) for display
i-e
CString str="Ω";
MessageBox(str);
but VisualStdio editor Doesnt support to Paste this smybol that is copied from Word file. so how can i use it.

Re: Displaying Symbol issue.........

Rajesh R Subramanian25-Jan-09 19:47

Rajesh R Subramanian

25-Jan-09 19:47

Try to load the string at runtime, set appropriate font and display it.

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Displaying Symbol issue.........

CPallini25-Jan-09 22:24

CPallini

25-Jan-09 22:24

You may write, for instance:

CString str = L"\x03A9";
MessageBox(str);

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Displaying Symbol issue.........

toxcct26-Jan-09 1:56

toxcct

26-Jan-09 1:56

CPallini wrote:
CString str = L"\x03A9";
MessageBox(str);

Wrong.
should be (if you want the code to compile regardless of the compilation mode) :

CStringW str = L"\x03A9";
MessageBoxW(str);

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Re: Displaying Symbol issue.........

CPallini26-Jan-09 2:28

CPallini

26-Jan-09 2:28

I was aware he had UNICODE defined. Poke tongue | ;-P

It's not wrong, given the context.
Smile | :)

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