Re: Switching Views in SDI - C / C++ / MFC Discussion Boards

Re: WaitForMultipleObjects always returns WAIT_FAILED

Kelly Herald4-Dec-03 17:52

4-Dec-03 17:52

I was getting this problem a couple of years ago. It was very frustrating until I read the chapter on threading in Jeff Prosise's book Programming Windows with MFC.

If the threads were created using AfxBeginThread which returns a CWinThread* then what is happening is that when at least one thread finishes the CWinThread is automatically deleting the thread handle which will cause WaitForMultipleObjects to return failed because at least one handle is invalid (closed). One way to resolve this is to create the thread suspended, duplicate the handle, and finally resume the thread. This means that the duplicate handle will be valid until YOU close it. Here is a simple code snippet:

CWinThread* pThread = AfxBeginThread(ThreadFunc, lpData, THREAD_PRIORITY_NORMAL, 0, CREATE_SUSPENDED);
::DuplicateHandle(AfxGetProcess(), pThread->m_hThread, AfxGetProcess(), &hThread, 0, FALSE, DUPLICATE_SAME_ACCESS);
pThread->ResumeThread();

...
...

::WaitForMultipleObjects...
::CloseHandle(hThread); // <-- remember to close the handles that you duplicated

This is VERY abbreviated code but it should give you the general idea.

Kelly Herald
Software Developer
MPC

Re: WaitForMultipleObjects always returns WAIT_FAILED

Kuniva5-Dec-03 0:19

Kuniva

5-Dec-03 0:19

Hi! Thanks for replying Smile | :)

I think you may have a point here, even though i'm not working in MFC, but i think there might be the possibility that the thread handle is closed before i call WaitForMultipleObjects() so i'll now try DuplicateHandle() and see if that works. Thanks!

Kuniva
--------------------------------------------

Re: WaitForMultipleObjects always returns WAIT_FAILED

Kuniva5-Dec-03 0:30

Kuniva

5-Dec-03 0:30

Yes! this fixed it, thanks!

Kuniva
--------------------------------------------

Re: WaitForMultipleObjects always returns WAIT_FAILED

Mike Dimmick5-Dec-03 0:02

Mike Dimmick

5-Dec-03 0:02

I hope HL is a typedef for vector< HANDLE >. Only vector among the STL containers guarantees that all contained items are contiguous (i.e. at adjacent memory locations), which is what WaitForMultipleObjects requires.

Re: WaitForMultipleObjects always returns WAIT_FAILED

Kuniva5-Dec-03 0:18

Kuniva

5-Dec-03 0:18

Yea, it is, thanks for replying Smile | :)

Kuniva
--------------------------------------------

Button in windows forms..c++

mitil203904823044-Dec-03 10:36

mitil20390482304

4-Dec-03 10:36

Hi
I am not using mfc or any kind of complex thing
I just work with windows forms using c++.
My question is how can I have a have the following.
by clicking the fist Button. user starsts a while loop. In the loop a series of events take place, and then we ask the user to input something to textBox. user enters the data and,clicks the 2nd Button. the program gets the data and goes back to the loop continueing its job.

what i have so far is :

private: System::Void 1stbtn_Click(System::Object * sender, System::EventArgs * e)
{
while (mycondition is true)
{
...do the job
wait for 2ndbtn to be pressed;
...do the job
}

}
private: System::Void 2ndbtn_Click(System::Object * sender, System::EventArgs * e)
{
lol = textBox->Text;
}

Switching Views in SDI

swerajan4-Dec-03 9:52

swerajan

4-Dec-03 9:52

I have a IDR_MAINFRAME with a menu called Lab6. Under it i have two menu's Lab4 and Relationship. I have two Dialog IDD_FAMAPP_FORM and IDD_FAMAPP_RELATION. when i run the application the default view is the IDD_FAMAPP_FORM. I am trying to write a code that switches the view when i click the menu item. I have this following code:
void CMainFrame::SelectView(UINT ViewID)
{
CFrameWnd* pMainWnd = (CFrameWnd*)AfxGetMainWnd();
CView* pOldActiveView = pMainWnd->GetActiveView(); // Get current view

// Get pointer to new view if it exists
// if it doesn't the pointer will be null
CView* pNewActiveView = (CView*)GetDlgItem(ViewID); - It is blowing right on this code, not going beyond this.
Please can someone let me know how to switch views with the scenario i have.

Re: Switching Views in SDI

Peter Molnar4-Dec-03 13:38

Peter Molnar

4-Dec-03 13:38

this should solve the problem:

http://www.codeproject.com/docview/switchingviews.asp

Peter Molnar

Problem with lpdirect3ddevice9

Simon Booth4-Dec-03 9:26

Simon Booth

4-Dec-03 9:26

I have started writing a class to create a d3d window, but every time i make a call to BeginScene,EndScene or Present my computer restarts. The following is my d3d initiation code which i run after creating a window, and then i try to run the functions from my main message loop. Could anyone please help, I'm having trouble debugging soon as my computer reboots everytime it doesnt work.

if((procIdle==NULL)||(procRender==NULL)||(procPreRender==NULL))return 1;
if(FAILED(lpD3D = Direct3DCreate9(D3D_SDK_VERSION)))return 2;
if(FAILED(lpD3D->CreateDevice
(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,hWnd
,D3DCREATE_SOFTWARE_VERTEXPROCESSING,&prm,&lpDevice)))return 3;
for(int i = 0;i < 209; i++)
if(render_states[i]!=NULL)
if(FAILED(lpDevice->SetRenderState
((D3DRENDERSTATETYPE)i,render_states[i])))return 4;;;
initiated = true;
return 0;

Re: Problem with lpdirect3ddevice9

ZoogieZork4-Dec-03 18:17

ZoogieZork

4-Dec-03 18:17

The computer restarting points to a driver bug.

Are you using the latest drivers for your video card?
Are you testing with the debug D3D runtime?

- Mike

PostMessage() problems

Sid_smily4-Dec-03 9:18

Sid_smily

4-Dec-03 9:18

Hi,

i have inherited a class from CEdit, and want to send my application a user defined message from this class. i have used PostMessage function for that reason from my class's LBUTTONDOWN message.

The message is captured by my window (a dialog box that has an edit box linked by a variable of my class) and works well while i work in Debug configuration, but causes an unhandled exception in Release Configuration Confused | :confused:

.

I would be obliged if any one can help me..
--------
THE CODE SAMPLE:
--------
Dev. Platform : VC++ 6.0
OS: Windows 2000 Professional

//class definition
class CMyClass : public CEdit
{
...
}

Void CMyClass::OnLButtonDown(UINT nFlags, CPoint point)
{
// my code...
....

CEdit::OnLButtonDown(nFlags, point);

//m_hParWnd is the handle of parent dialog claas
::PostMessage(m_hParWnd, TOGGLE, 0, 0);
}

/*My applications main dialog with a member variable of CMyClass associated with an edit box*/
..
ON_MESSAGE(TOGGLE, OnToggle)
...

CMyAppDlg::OnToggle()
{
....
}

Kind Regards

Siddique Ahmed
Senior Software Engineer
Telelogix Software
(www.telelogix.com)

Re: PostMessage() problems

David Crow4-Dec-03 9:24

David Crow

4-Dec-03 9:24

Sid_smily wrote:
::PostMessage(m_hParWnd, TOGGLE, 0, 0);

Is m_hParWnd non-NULL? If you comment out this statement, does the UE still occur? Does anything special happen within the OnToggle() method?

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

The right way

Abin4-Dec-03 13:27

Abin

4-Dec-03 13:27

You are defining an incorrect handling function in your CMyAppDlg, the right way to do so is:

// in MyAppDlg.h
class CMyAppDlg : public CDialog
{
    // ... ...
    afx_msg LRESULT OnToggle(WPARAM wParam, LPARAM lParam);
    // ... ...
}
  
// in MyAppDlg.cpp
ON_MESSAGE(TOGGLE, OnToggle)
  
LRESULT CMyAppDlg::OnToggle(WPARAM wParam, LPARAM lParam)
{
    // ... ...
    return (LRESULT)0;
}

This will work fine.

UpdateLayeredWindow() Help !!!

4-Dec-03 8:50

I do not understand how to use this API. Like I need a little bit more information then what MSDN has to offer and some of the sample code on CP. This is what I am trying to do. I am trying to make it so that when I send a WM_CLOSE message the window fades slowly away. But if I use SetLayeredWindowAttributes(), works no problem. But I want to use UpdateLayeredWindow(). I have tried everything to get it to render the window. Sometimes just the copy of my IDE shows up. Now How do I set this function up??? I am coding in win32 C/C++ -> No MFC. Any help would be great. I have spent 2 days trying to figure this crap out. With no help from anywhere except u guys. But I dont understand all the MFC code to dissect it.

Thank You
Gino

Lastest beta of Visual Studio .NET

Robert Buldoc4-Dec-03 7:54

Robert Buldoc

4-Dec-03 7:54

Hi fellow programmers!
I was wondering what is the latest beta of Visual Studio .NET that can compile AMD64 code for Windows XP 64-bit?

Thanks for your answers!
Rob

Re: Lastest beta of Visual Studio .NET

Mike Dimmick5-Dec-03 0:23

Mike Dimmick

5-Dec-03 0:23

Currently the only shipping AMD64 compiler from Microsoft is in the Driver Developers' Kit[^]. The same is also true for the Itanium compiler.

These are only command-line compilers, so you should consider using a separate build tool, such as the DDK's BUILD.EXE, NMAKE.EXE or NAnt[^].

The x86 compiler is basically the same one that VS.NET uses (VS.NET compiles by running the cl.exe program).

I'd be impressed if you'd managed to get hold of an AMD64 system running Windows XP 64-bit, because that hasn't been released yet, IIRC. If you've only installed the regular version of Windows XP, you won't be able to run native 64-bit programs. The compilers in the DDK are cross-compilers - they are actually 32-bit x86 programs, but they build for the appropriate platform (although MS does supply an Itanium-native Itanium compiler).

Re: Lastest beta of Visual Studio .NET

Robert Buldoc5-Dec-03 21:05

Robert Buldoc

5-Dec-03 21:05

Thanks for your reply.
I am an independant developer, developing a software for AMD. I have their fullsuppot and will be getting the latest build of Windows XP 64-bit next week. I am not at liberty to say more about the project or I would have.

I know I read somewhere that there is a beta of Visual Studio.NET with AMD64 available in the IDE. I already asked my contact in AMD for that. And will post the answer here if possible.

VS .NET window type

rpadrela4-Dec-03 7:29

rpadrela

4-Dec-03 7:29

Anyone knows what kind of window is the one that holds our files in Visual Studio .NET ? The Window as a nice property that i would like to use that is, auto-hide. The window shows up when we pass the mouse cursor over it and automatically gets hidden when the mouse cursor isn't on top of it. Anyone ?

Thanks.

Re: VS .NET window type

Christian Graus4-Dec-03 10:17

Christian Graus

4-Dec-03 10:17

This is custom implimented behaviour, not behaviour you can get from deriving from an existing class in the framework.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Re: VS .NET window type

rpadrela5-Dec-03 3:18

rpadrela

5-Dec-03 3:18

what's the name of that window ?

Re: VS .NET window type

Christian Graus7-Dec-03 8:28

Christian Graus

7-Dec-03 8:28

Fred.

Seriously, what are you trying to do ?

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Layout controlbars?

Zizilamoroso4-Dec-03 7:20

Zizilamoroso

4-Dec-03 7:20

I have several CControlBar derived bars attached to a CFrameWnd.

It seems the horizontal bars always have stretch priority over the vertical ones (more or less like borderlayout in java).

example: the bottom bar is always stretched from left to right first, so the right bar cannot stretch to the bottom anymore.

But I would like the right bar stretched to the bottom, before the bottom bar is streched.

How can I change this?

using: [VISUAL STUDIO 6.0 sp5] [WIN98/2]

how do i create a resource assembly?

godzooky4-Dec-03 6:48

godzooky

4-Dec-03 6:48

i need to create a resource assembly that contains a bunch of gifs. the gifs need to be displayed dynamically. how would i accomplish this? i added an assembly resource file to my project, then used resgen to create the .resource file, but i can't figure out how to add gifs to it. i feel like i am missing something obvious.

thanks.

Replace MFC with Web Browser

sweep1234-Dec-03 6:41

sweep123

4-Dec-03 6:41

I have been writing software for the Windows environment using Visual Studio .Net (C++).
However as some groups have been using VME PowerPC h/w with VxWorks operating system. Now with the need to re-use software and develop 'common' s/w items between the two platforms. The idear to use a Web Browser to provide the common GUI was suggested.

Could use complier switches to cope with the different platforms, but need to separate out the GUI and make it identical on the platforms.

Question is, can the elements of MFC be replaced by a Browser?

i.e. the Browser communicate with the C++ task (C++ task with no Windows input/output), using TCP/IP?

Regards,

enable profiling in .net 2003

Jon Winkel4-Dec-03 6:38

Jon Winkel

4-Dec-03 6:38

Dear All,

In Visual C++ 6.0 there used to be this very useful thing called a profiler. In the settings you could enable profiling and when the program was started the profiler spat out all kinds of useful information (what functions were called, how often and how long it took.)

Now I'm using .Net 2003 and I don't really know why... VC++ 6.0 was and still is really good...

My question: Is there a profiler in .net 2003 (I couldn't find it) and if so, how do I enable it?

Best regards,

Jon

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