stdout flushing - C / C++ / MFC Discussion Boards

Stephen Caldwell15-Aug-01 16:54

15-Aug-01 16:54

I've never programmed for NT/2000 before, and I kinda don't have an NT/2000 box at my immediate disposal. Can someone tell me if FindWindow works the same on both 98 and NT/2000? My app is giving me grief when i try to run on win2k.

Thanx,
Stephen Caldwell

Re: 98 NT compatibility

Tomasz Sowinski16-Aug-01 1:02

Tomasz Sowinski

16-Aug-01 1:02

Sorry, I'm not a native English speaker; what do you mean by "giving grief"?

Tomasz Sowinski -- http://www.shooltz.com

Re: 98 NT compatibility

Stephen Caldwell16-Aug-01 4:56

Stephen Caldwell

16-Aug-01 4:56

It means that it's really getting on my nerves.

Stephen Caldwell

Re: 98 NT compatibility

Tomasz Sowinski16-Aug-01 5:38

Tomasz Sowinski

16-Aug-01 5:38

Cool. Now post some code related to the problem.

Tomasz Sowinski -- http://www.shooltz.com

Re: 98 NT compatibility

Ray Kinsella16-Aug-01 5:44

Ray Kinsella

16-Aug-01 5:44

Stephen Caldwell,

don't you mean that it is 'upsetting you' ?

Regards

Ray

"Je Suis Mort De Rire"

Re: 98 NT compatibility

Ray Kinsella16-Aug-01 5:54

Ray Kinsella

16-Aug-01 5:54

As I remember the only difference is that Win98 version uses ASCII and WinNT version uses Unicode.

Regards

Ray

"Je Suis Mort De Rire"

Re: 98 NT compatibility

Tomasz Sowinski16-Aug-01 6:16

Tomasz Sowinski

16-Aug-01 6:16

In fact, NT has two versions of FindWindow (as well as other API functions). FindWindowW uses Unicode, FindWindowA uses ASCII.

Tomasz Sowinski -- http://www.shooltz.com

stdout flushing

15-Aug-01 14:12

I've been having a problem recently that has really been bugging me; for some reason, when I use printf or cout, the output will not appear on the console - I assume this is because stdout is not being flushed. Any idea why this is? I don't want to have to call fflush(stdout) after every printf!

Re: stdout flushing

Michael Dunn15-Aug-01 17:56

Michael Dunn

15-Aug-01 17:56

Stdout is normally line-buffered, so end your printfs with \n. When printing to cout, add a "cout << endl" to get a newline.

--Mike--
http://home.inreach.com/mdunn/
A recent survey reports that 1/4 of all internet users in England surf for porn.
The other 3/4 just didn't want to admit it.

Re: stdout flushing

Langweilig16-Aug-01 5:36

Langweilig

16-Aug-01 5:36

I was already doing this - it's not working.

CListBox

John Uhlenbrock15-Aug-01 14:12

John Uhlenbrock

15-Aug-01 14:12

I am using CListBox::SetTopIndex() to make sure I can view the last entry in a list box. I would like the view to adjust so the last entry is shown about half way between the top of the bottom of the list box control. I created a quick formula to do this, however, I found that using SetTopIndex() will make the last entry visible, but no matter what I put as the index for SetTopIndex(), it always puts the last entry at the bottom of the list box control. Visible yes, what I want, no.

Any ideas?

Thanks
John

Re: CListBox

Not Active15-Aug-01 16:27

Not Active

15-Aug-01 16:27

Do I understand correctly, you want the last item entered into a list box to be displayed centered vertically? There are no other entries in the list box below this one?

If this is what I understand then you can't. What you may have to do is add empty strings to pad the listbox and move the item up.

Sending info between Dialogs

RobJones15-Aug-01 13:05

RobJones

15-Aug-01 13:05

Dumb question.. If I have a dialog type application called "A".. and I create dialog box "B" within the same app. I then create a member variable for "B" in "A"s Class how can I update a control on "A" from "B".. for example lets say I have a listbox on dialog "A" and I input a string into an edit box on dialog "B" from "B" I want to add the item to the listbox on "A" with out actually pulling the string from "A" and inserting it.. can this done or do I have to update the variable and add it while in "A"?

Any help would be greatly appreciated.

Rob Jones

Re: Sending info between Dialogs

16-Aug-01 9:53

You could do that with ::SetDlgItemText(..)
Or eaven send a window message to a control

How do I select a peice of a bmp to another file?

Craig Miller15-Aug-01 12:47

Craig Miller

15-Aug-01 12:47

Hi,

I currently have a bitmap that is being held in a CDC and I would like to get a peice of that bitmap and save it to another bitmap. For instance, let's say that I have a bitmap that is 100 x 100 pixels. I want to select region 25, 25, 50, 50 copy it to another DC I guess? and then save it out to another .bmp file.

Does anyone know how to do this? I have the coordinates of what I want to copy to the new bitmap but don't know how to do it.

Thanks for any help you can provide,

Craig

Re: How do I select a peice of a bmp to another file?

Christian Graus15-Aug-01 13:26

Christian Graus

15-Aug-01 13:26

Create a new CBitmap of the size you want, a new CDC to hold the CBitmap, and then use BitBlt to copy across the section you want.

Christian

Secrets of a happy marriage #27:

Never go to bed if you are mad at each other. It's more fun to stay up and fight.

Re: How do I select a peice of a bmp to another file?

Craig Miller15-Aug-01 13:36

Craig Miller

15-Aug-01 13:36

Hi Christian,

Here is what I've got so far:

CDC dcMemory;
dcMemory.CreateCompatibleDC(&dc);
				
// Select the bitmap into the in-memory device context.
COXDIB imagePiece;
imagePiece.CreateEmptyDIB(1, 55, 50);
CBitmap* pOldBitmap = imagePiece.MakeBitmap(&imagePiece, &dcMemory, CSize(55, 50));

//dc is a previously loaded bitmap (the full size bitmap)		
dc.BitBlt(0, 0, 55, 50, &dcMemory, x, y, SRCCOPY);

CFile imageFile("c:\\temp\\imageManip\\testResult.bmp", CFile::modeCreate|CFile::modeWrite);

imagePiece.Write(&imageFile);
				
dcMemory.SelectObject(pOldBitmap);

When I look at the image that I created it is just all black, nothing else.

Am I on the right track?

Thanks,

Craig

Re: How do I select a peice of a bmp to another file?

Christian Graus15-Aug-01 13:45

Christian Graus

15-Aug-01 13:45

What is a C0XDIB ? I assume a DIBSection wrapper ? x and y are valid values ? I can't comment on what you're doing wrong, but as therest looks fine I'd assume it's in the section:

// Select the bitmap into the in-memory device context.
COXDIB imagePiece;
imagePiece.CreateEmptyDIB(1, 55, 50);
CBitmap* pOldBitmap = imagePiece.MakeBitmap(&imagePiece, &dcMemory, CSize(55, 50));

if x and y are good values, because I have no idea what the syntax for this class you're using is. I'd bet on the last line if I had to make a guess, but only because CreateEmtyDIB is obviously working ;0

Christian

Secrets of a happy marriage #27:

Never go to bed if you are mad at each other. It's more fun to stay up and fight.

Re: How do I select a peice of a bmp to another file?

Craig Miller15-Aug-01 13:58

Craig Miller

15-Aug-01 13:58

ok, so let's say I try something like this:

CDC dcMemory;
dcMemory.CreateCompatibleDC(&dc);

dc.BitBlt(0, 0, 55, 50, &dcMemory, x, y, SRCCOPY);

CBitmap bitmap;

CFile imageFile("c:\\temp\\imageManip\\testResult.bmp", CFile::modeCreate|CFile::modeWrite);

imageFile.Close();

Given that, how would I copy the dcMemory into the new CBitmap? After that, how do I write out the CBitmap to a file?

Sorry for such basic questions,

Craig

Re: How do I select a peice of a bmp to another file?

Christian Graus15-Aug-01 14:08

Christian Graus

15-Aug-01 14:08

The way you were trying - by calling CreateBitmap on the bitmap, with the bits per pixel of the old bitmap and the size you want. Select it into a new DC and call BitBlt, just like you were doing.

For saving, if you don't want to use GDI+, there is a recent submission to this site that saves bitmaps in multiple formats.

Christian

Secrets of a happy marriage #27:

Never go to bed if you are mad at each other. It's more fun to stay up and fight.

Re: How do I select a peice of a bmp to another file?

Craig Miller15-Aug-01 16:17

Craig Miller

15-Aug-01 16:17

Thanks Christian, I'll give it a try.

header files

15-Aug-01 12:08

Hi, in my program I have two classes, say A and B. In class A I need to use B's functions, while in B I need to use A's. If in A I include B.h and in B I include A.h the compiler will complain. How can I make it work?

Re: header files

Christian Graus15-Aug-01 12:13

Christian Graus

15-Aug-01 12:13

Include the files in the .cpp file. Or, if you need to declare an instance of A in B and B in A, then in one of them include in the .cpp file and in the header just put a dummy declaration, for example in B.h you might put

class A();

A m_MyA;

and include the *real* A.h in B.cpp.

Christian

Secrets of a happy marriage #27:

Never go to bed if you are mad at each other. It's more fun to stay up and fight.

How to get Folder where the application is installed

Francis B.15-Aug-01 11:43

Francis B.

15-Aug-01 11:43

I would like to know, how to get the directory where the application is installed.

I tried to use _getcmd but this doesn't works correctly.

Thanks for your help!

Re: How to get Folder where the application is installed

Matt Gullett15-Aug-01 11:55

Matt Gullett

15-Aug-01 11:55

char szAppName[2000];
char szDrive[200];
char szDir[200];

memset(szAppName, 0, 2000);
memset(szDrive, 0, 200);
memset(szDir, 0, 200);

::GetModuleFileName(AfxGetInstanceHandle(), szAppName, 2000);

_splitpath(szAppName, szDrive, szDir, NULL, NULL);

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