Re: DoModal in DropFiles Error ?! - C / C++ / MFC Discussion Boards

GrumbleWeedster18-Apr-06 7:12

18-Apr-06 7:12

At this moment it isn't returning a value because of the current problem, it's still a plain dialog box with an OnOK() to close.

Re: DoModal in DropFiles Error ?!

David Crow18-Apr-06 7:35

David Crow

18-Apr-06 7:35

Ok, so what happens in CFileReplace::OnInitDialog()?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: DoModal in DropFiles Error ?!

GrumbleWeedster18-Apr-06 7:37

GrumbleWeedster

18-Apr-06 7:37

Nothing.
At the moment CFileReplace is an empty default dialog with and OK and Cancel button.
There are no custom functions in place yet because I need to get around the initial error.

Re: DoModal in DropFiles Error ?!

David Crow18-Apr-06 7:53

David Crow

18-Apr-06 7:53

GrumbleWeedster wrote:
At the moment CFileReplace is an empty default dialog with and OK and Cancel button.
There are no custom functions in place...

Based on that, can we then assume that it has no bearing on the problem?

Also, answering this question will go a long way towards the solution.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: DoModal in DropFiles Error ?!

GrumbleWeedster18-Apr-06 11:21

GrumbleWeedster

18-Apr-06 11:21

I may have found a solution but can anyone tell me if it could cause a problem?
Changing the code in PreTranslateMessage(MSG* pMsg) stopped the error from occuring:

Original Code: (Not Working)

<br />
if( pMsg->message == WM_DROPFILES) OnDropFiles(pMsg->wParam,pMsg->lParam);<br />
return CDialog::PreTranslateMessage(pMsg);<br />

Modified Code: (Working)

<br />
if( pMsg->message == WM_DROPFILES)<br />
{<br />
  OnDropFiles(pMsg->wParam,pMsg->lParam);<br />
  ::TranslateMessage(pMsg);<br />
  ::DispatchMessage(pMsg);<br />
  return TRUE;<br />
}<br />
else return CDialog::PreTranslateMessage(pMsg);<br />

As I said, this does make the function work correctly, but is it a solution or is it just diverting from the error?

Re: DoModal in DropFiles Error ?!

David Crow19-Apr-06 2:27

David Crow

19-Apr-06 2:27

GrumbleWeedster wrote:
if( pMsg->message == WM_DROPFILES)

What's this? Why are you looking for this message in the PreTranslateMessage() method? You should be handling the WM_DROPFILES message via the message map:

BEGIN_MESSAGE_MAP(CMyDlg, CDialog)
  //{{AFX_MSG_MAP(CMyDlg)
  ON_MESSAGE(WM_DROPFILES, OnDropFiles)
  //}}AFX_MSG_MAP
END_MESSAGE_MAP()

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: DoModal in DropFiles Error ?!

GrumbleWeedster19-Apr-06 2:45

GrumbleWeedster

19-Apr-06 2:45

Dialog based applications can't seem to handle drop files that way.
Nothing is ever added to the list when items are dropped. The only way I've found to enable drag and drop in a dialog based app is intercept the message in PreTranslateMessage()

Re: DoModal in DropFiles Error ?!

David Crow18-Apr-06 4:45

David Crow

18-Apr-06 4:45

GrumbleWeedster wrote:
My problem is, everything works fine until the end of the DropFiles function is reached..when it returns the program crashes from the following Assert:
ASSERT(::IsWindow(m_hWnd));

Anyone know how to fix this?

So what is happening within the DropFiles() function?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: DoModal in DropFiles Error ?!

Russell^'18-Apr-06 5:08

Russell^'

18-Apr-06 5:08

This error can occours if you destroyed that CWnd object into the DropFiles function.

else, be more clear to understand how the error comes, or how work the function.

Have a nice code day Wink | ;)

loadlibrary failed

yongwpi18-Apr-06 4:26

yongwpi

18-Apr-06 4:26

I am building a directshow source filter, but I received the error message "LoadLibrary("xxx.ax") failed - The specified module could not be found." when I registered the filter. I used some DLL to build the filter. Thanks for any information about the error message.

Re: loadlibrary failed

Cedric Moonen18-Apr-06 4:30

Cedric Moonen

18-Apr-06 4:30

I think the error message is pretty clear no ? There is a missing library. Add this missing file in the proper folder (probably the working directory) to solve the problem.

Otherwise give more information about the problem.

Re: loadlibrary failed

yongwpi18-Apr-06 7:11

yongwpi

18-Apr-06 7:11

Thanks. You are right. I used dependencywalker to find out what dlls are missing, and added those dlls in the same directory. Problem was solved.

how to invert single bit in 32bit integer?

9ine18-Apr-06 4:07

9ine

18-Apr-06 4:07

how to having some 32 bit number invert only a single bit in it
some clever stuff of ~&| ops is needed

0100101010011[1]001001010100111001 to invert 1 value bit
0100101010011[0]001001010100111001

or

01001010100111[0]01001010100111001 to invert 0 value bit
01001010100111[1]01001010100111001

9ine

Re: how to invert single bit in 32bit integer?

toxcct18-Apr-06 4:14

toxcct

18-Apr-06 4:14

DWORD dw = 0xFC246A09;    //or whatever else...
DWORD mask = 0x00008000;  //32th bit from right
 
if ((dw & mask) == mask) {
    //the bit is set, then we unset it
    dw &= ~mask;
}
else {
    //the bit equals 0, then we set it to 1
    dw |= mask;
}

Re: how to invert single bit in 32bit integer?

BadKarma18-Apr-06 4:22

BadKarma

18-Apr-06 4:22

If you just want to toggle you could use xor

dw ^= mask;

codito ergo sum

Re: how to invert single bit in 32bit integer?

9ine18-Apr-06 4:32

9ine

18-Apr-06 4:32

oh yes just to toggle

9ine

Re: how to invert single bit in 32bit integer?

toxcct18-Apr-06 4:49

toxcct

18-Apr-06 4:49

thanks BadKarma, i was actually wondering about it (didn't forget it), but it's ok.

i also updated my article on bitwise flags[^]... Wink | ;)

Re: how to invert single bit in 32bit integer?

9ine18-Apr-06 4:23

9ine

18-Apr-06 4:23

oh I remembered this is one proper op

dw &= ~mask;

probably something more brief

if(dw & mask) //bit=0
dw |= mask;
else //bit=1
dw &= ~mask;

9ine

Re: how to invert single bit in 32bit integer?

toxcct18-Apr-06 4:32

toxcct

18-Apr-06 4:32

i don't like removing the curved braces, because they can end in heavy problems (especially when using macros...
i disadvise you to do so ; moreover, it won't produce lighter code after the compilation, so why writing less readable code ?! Wink | ;)

but as badkarma suggested, you can also use the ^ XOR operator. but be careful !!! the mask variable must have only one bit set at a time, otherwise you could have several bits switching...

Re: how to invert single bit in 32bit integer?

9ine18-Apr-06 4:51

9ine

18-Apr-06 4:51

the fewer the code the better, so it is quite normal to use if(!a) instead of if(a==0)

9ine

Re: how to invert single bit in 32bit integer?

toxcct18-Apr-06 4:54

toxcct

18-Apr-06 4:54

9ine wrote:
the fewer the code the better

false.
the explicit cast you don't do, the compiler will do them implicitely itself.
so don't loose the readability point Wink | ;)

moreover, read this[^]

Re: how to invert single bit in 32bit integer?

David Crow18-Apr-06 5:14

David Crow

18-Apr-06 5:14

9ine wrote:
...it is quite normal to use if(!a) instead of if(a==0)

I don't consider that to be normal at all.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: how to invert single bit in 32bit integer?

David Crow18-Apr-06 4:34

David Crow

18-Apr-06 4:34

9ine wrote:

0100101010011[1]001001010100111001 to invert 1 value bit
0100101010011[0]001001010100111001

Try:

unsigned int x = 0x4A9C9539; // 1001010100111001001010100111001
x &= ~0x40000;               // 0000000000001000000000000000000

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: how to invert single bit in 32bit integer?

9ine18-Apr-06 4:49

9ine

18-Apr-06 4:49

I need to toggle it simultaniously 1to0 or if 0to1
xor is good

9ine

Re: how to invert single bit in 32bit integer?

David Crow18-Apr-06 5:06

David Crow

18-Apr-06 5:06

Right. You'll need the XOR operator to do both. My suggestion was just for one (i.e., 1 to 0). To go the other way (i.e., 0 to 1), use the OR operator.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

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