C / C++ / MFC Discussion Boards

David Crow29-Mar-04 8:03

29-Mar-04 8:03

It's hard to say, without narrowing it down to just a few lines of code. If, in the overridden ProcessMessageFilter(), you simply called the base class implementation, does the 'ding' go away?

[edit]
I have a small application that displays a modal About box. When that dialog is up, any key press causes the 'ding' sound. I then added a few controls to the dialog. Depending on which control had focus, the 'ding' either happened or it didn't. I did not have an overridden ProcessMessageFilter() method.
[/edit]

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Re: Removing ding

Prakash Nadar29-Mar-04 8:31

Prakash Nadar

29-Mar-04 8:31

I guess if you return 0 in the WM_KEYDOWN event will probably remove the ding sound.

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Re: Removing ding

doctorpi30-Mar-04 2:29

doctorpi

30-Mar-04 2:29

Hi guys
Sorry for the delay, but the Atlantic Ocean is between us. Blush | :O

))
This is the substituted ProcessMessageFilter,sending a message to the dialog.
Previously I've fill m_hwndDialog with the handle to my dialog.

BOOL CMQWinApp::ProcessMessageFilter(int code, LPMSG lpMsg)
{
// Check to make sure CPenWidthsDlg is up
if (m_hwndDialog != NULL)
{
if ((lpMsg->hwnd == m_hwndDialog) ||
::IsChild(m_hwndDialog, lpMsg->hwnd))
// Use ::IsChild to get messages that may be going
// to the dialog's controls. In the case of
// WM_KEYDOWN this is required.
{
if (lpMsg->message == WM_KEYDOWN) {
TRACE("Got WM_KEYDOWN\n");
SendMessage(m_hwndDialog,WM_KEYDOWN,lpMsg->wParam,lpMsg->lParam);
}
}
}
// Default processing of the message.
return CWinApp::ProcessMessageFilter(code, lpMsg);
}

The ding is produced after my OnKeyDown method is processed in my dialog.
Some clue?
Doc

Limiting dekstop(maximized windows') size

clayman8729-Mar-04 5:20

clayman87

29-Mar-04 5:20

Hi!

The idea came from ICQ, where if you dock it to the sides it limits the size of the desktop the same way as i.e. the tray does.

So I'd like to know how to restrict the desktop, and therefore the size of the maximized windows', is there even any way, a func, or something...

Thx in forward

Re: Limiting dekstop(maximized windows') size

valikac29-Mar-04 6:46

valikac

29-Mar-04 6:46

One possible solution is WM_GETMINMAXINFO message in MFC.

Kuphryn

Re: Limiting dekstop(maximized windows') size

Michael Dunn29-Mar-04 8:30

Michael Dunn

29-Mar-04 8:30

Read up on application bars (app bars) in MSDN, those are the windows like the taskbar that dock to the sides of the screen.

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namespace std

BlackDice29-Mar-04 5:03

BlackDice

29-Mar-04 5:03

Is there a certain file I should include to use the namespace std? I keep trying to put in my file 'using namespace std' and keep getting an error telling me that namespace doesn't exist

If it's broken, I probably did it

bdiamond

Re: namespace std

C^hris L^osinger29-Mar-04 5:35

C^hris L^osinger

29-Mar-04 5:35

no, there's no single file to include, and if you're not using any classes that are in std, you don't need to use the namespace.

but, if you want to have "using namespace std;" for some other reason and just want to get rid of that error message, try :

#include < vector > // or any other C++ std file

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Re: namespace std

BlackDice29-Mar-04 5:40

BlackDice

29-Mar-04 5:40

thanks, I had already gotten it to do that by including <iostream>. I only wanted to use it because I thought it was possibly the cause of another error, but it wasn't, so I'll keep working!!;P

If it's broken, I probably did it

bdiamond

error C1010

dadacncn29-Mar-04 4:40

dadacncn

29-Mar-04 4:40

Hello,

I want to insert two files in a MFC workspace. Two files are readText.h and readText.cpp.
the header file is:

#ifndef _READTEXT_H_
#define _READTEXT_H_
#include "fstream.h"
void readText(char *filename, int *spalte, int *zeile);
#endif

and at the begin of the readText.cpp I write #include "readtext.h

but there is a compile error C1010. how should I write the header file?

thanks in advance
dada

Re: error C1010

ohadp29-Mar-04 4:48

ohadp

29-Mar-04 4:48

Your project uses pre-compiled headers, your .cpp file needs to #include "stdafx.h" before it includes anything else.

Re: error C1010

dadacncn29-Mar-04 4:51

dadacncn

29-Mar-04 4:51

it works! thank you very much!;)

WaitForSingleObject - Handle for ShellExecute()

ndalal29-Mar-04 4:38

ndalal

29-Mar-04 4:38

Hi,

I'm having trouble using WaitForSingleObject for the handle used in ShellExecute(). The mutex returned always has 0xffffffff, i.e. WAIT_FAILED.
Why dont I receive any of these:
WAIT_OBJECT_O, WAIT_ABANDONED or WAIT_TIMEOUT.

It seems that the handle from ShellExecute cannot be used with WaitForSingleObject. If thats the case, then what should I use to wait for the ShellExecute process to complete?

Note: ShellExecute process executes a batch file which has several commands to run on command prompt. This proocess takes several seconds to complete, which could vary though.

Any help or comments are appreciated.
Thanks,
- Nirav

===========================================
x = ShellExecute(handl, "open", "foo.bat", NULL, NULL, SW_HIDE);
mutex = WaitForSingleObject(handl,INFINITE);
do {
mutex = WaitForSingleObject(handl,INFINITE);
} while(mutex == WAIT_OBJECT_0);
if(mutex != WAIT_OBJECT_0)
return E_FAIL;

BOOL status = ReleaseMutex(handl);
if (status == 0) {
DWORD LastErr = GetLastError();
}
===========================================

Re: WaitForSingleObject - Handle for ShellExecute()

basementman29-Mar-04 4:44

basementman

29-Mar-04 4:44

Your second wait is returning the INVALID_HANDLE. If you use the INFINITE flag, then the second wait is unnecessary and invalid.

onwards and upwards...

Re: WaitForSingleObject - Handle for ShellExecute()

ndalal29-Mar-04 4:50

ndalal

29-Mar-04 4:50

OK.

If I remove the first wait, it still returns the same mutex (0xffffffff) from the second wait.

Any clue?

Thanks again.

Re: WaitForSingleObject - Handle for ShellExecute()

David Crow29-Mar-04 5:07

David Crow

29-Mar-04 5:07

The first parameter to ShellExecute() and WaitForSingleObject() are not the same thing. The former is a window handle, while the latter is a handle to an object. What you want is something like:

PROCESS_INFORMATION pi = {0};
CreateProcess(..., &pi);
WaitForSingleObject(pi.hProcess, ...);

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: WaitForSingleObject - Handle for ShellExecute()

ndalal29-Mar-04 6:09

ndalal

29-Mar-04 6:09

I'm not sure if I can execute a batch file on command line using CreateProcess.
Note that the batch file include several different commands (compile and link) which needs to execute on the "same" command line window.

CreateProcess execute an application with one command only. I'm not sure if it can execute a batch file.

If I execute the following code, I get exception handling error on CreateProcess() line.

===============================================
PROCESS_INFORMATION pi;
if(CreateProcess("foo.bat", NULL, NULL, NULL, FALSE, CREATE_DEFAULT_ERROR_MODE, NULL, NULL, NULL, &pi) == FALSE) {
return S_FALSE;
}

do {
mutex = WaitForSingleObject(pi.hProcess,INFINITE);
} while(mutex == WAIT_OBJECT_0);

Re: WaitForSingleObject - Handle for ShellExecute()

David Crow29-Mar-04 6:20

David Crow

29-Mar-04 6:20

ndalal wrote:
I'm not sure if it can execute a batch file.

Yes, it can be used with .bat files.

I do not think NULL is a valid option for the ninth parameter.

The do/while loop seems unnecessary as WaitForSingleObject() will do its own waiting without using any processor time. As you have it written, WaitForSingleObject() will wait indefinitely for the object's state to become signaled, but will then loop infinitely as the state will remain signaled.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: WaitForSingleObject - Handle for ShellExecute()

Michael Dunn29-Mar-04 8:45

Michael Dunn

29-Mar-04 8:45

ShellExecute() doesn't return a process handle even though the return type is HINSTANCE. Use ShellExecuteEx() to get a handle that you can wait on.

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Printing in a dialog based application

Member 426420329-Mar-04 4:12

Member 4264203

29-Mar-04 4:12

I am using a dialog based application.
The application will generate a report after doing a lot of testing.
I want the report to be printed whenever the user presses one button from the dialog box.
Can anyone help me.

Joesam

Re: Printing in a dialog based application

Antti Keskinen29-Mar-04 4:38

Antti Keskinen

29-Mar-04 4:38

See this article[^] by Richard Stringer. Should have everything you ever need in printing from MFC programs.

-Antti Keskinen

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Re: Printing in a dialog based application

Roger Allen30-Mar-04 0:53

Roger Allen

30-Mar-04 0:53

This article of mine MFC CDialog print/preview extension[^] will do exactly what you need.

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static array of base class pointers??

LudaLuda29-Mar-04 4:00

LudaLuda

29-Mar-04 4:00

Hey guys,

here is the problem:

I have to keep an static array of pointers of type base class , and I should be able to assign each of these pointers to any of the derived class..

here is the code...

class Base
{
public:
static Base* basePtr[10];
}

class derived1 : public Base
{ }

class derived2 : public Base
{}

now in my main.cpp I want to be able to create objects of derived1 or derived2 and assign the basePtr to point to them....

how do I do that???

.....
...
derived1 d1
Base::basePtr[1] = &d1 // I tried this approach, the problem is...does this mean I have to have 10 different classes of d1 or d2 and then assign each of their references to the basePtr ??? Is there way to do this dynamically so that I do some thing like the following

Base::basePtr[1] = new derived1;

Pls help..

thanks

Re: static array of base class pointers??

ohadp29-Mar-04 4:37

ohadp

29-Mar-04 4:37

Without arguing about the design of these classes, grin, you can do:

<br />
for (int i=0; i<5; i++)<br />
{<br />
   Base::basePtr[i] = new derived1;<br />
   Base::basePtr[5+i] = new derived2;<br />
}<br />

what could be nicer would be to have the constructor of Base store the pointers itself.

<br />
Base::Base()<br />
{<br />
   basePtr[numObjects++] = this;<br />
}<br />

You would have to add a static 'numObjects' counter for this to work, or...

<br />
Base::Base(int pos)<br />
{<br />
   basePtr[pos] = this;<br />
}<br />

As long as you don't create 'Base' objects but only derived objects, you can just go and do this :

<br />
for (int i=0; i<5; i++)<br />
{<br />
   new derived1;<br />
   new derived2;<br />
<br />

OR:

<br />
   new derived1[i];<br />
   ned derived2[5+i];<br />
}<br />

Re: static array of base class pointers??

LudaLuda29-Mar-04 4:53

LudaLuda

29-Mar-04 4:53

oh one important detail I left out is that

my base class is abstract ....

so there will be instantiation of this class inside the main program.

I tried ur method above to have new objects created dynamically and store thier pointer to the array pointer but it doenst seem to be working

I tried

Base::basePtr[1] = new derived1;

this would not work ! I get a link , unresolved external for static Base::basePtr ...etc etc..

do I have to initialize the abstract class that contains the static array somewhere in the main code ??? how do I do that? or is it even possible?

Thanks

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