Re: set bits on binary images - C / C++ / MFC Discussion Boards

maycockt2-Dec-09 2:59

2-Dec-09 2:59

Hi,

Is it possible to set the size of the tab spaces on a CListBox? e.g. in Visual Studio you can configure the number of spaces that a Tab simulates - can this be done within a CListBox?

TIA

Tony

Re: CListBox Tab Spacing

Rajesh R Subramanian2-Dec-09 3:02

Rajesh R Subramanian

2-Dec-09 3:02

You cannot type within a CListBox, can you? So what sense does it make to have the number of spaces tab would simulate within a CListBox?! Confused | :confused:

Pressing tab would take the focus to next control in the tab order by default. I'm not sure I understand your query well...

“Follow your bliss.” – Joseph Campbell

Re: CListBox Tab Spacing

maycockt2-Dec-09 3:07

maycockt

2-Dec-09 3:07

Hi,

I probably didn't explain it well enough.

You can add strings to a List Box that contain \t to represent tabs. Currently the \t symbol translates to about 8 spaces, whereas I could do with it being about 4 spaces.

As an example, I am currently displaying something similar to this

Header
            Data1
            Data2

BUT I really would prefer something like this

Header
      Data1
      Data2

Any ideas?

Tony

Re: CListBox Tab Spacing

maycockt2-Dec-09 3:19

maycockt

2-Dec-09 3:19

Problem Solved,

I missed SetTabStops when looking at the ListBox members...

Thanks for focussing my thoughts

Tony

set bits on binary images

franckesh2-Dec-09 2:24

franckesh

2-Dec-09 2:24

Hi,
I want to transform a black&white image into a binary image. I would like the background (black)to have 0 and the foreground(white) to have 1. I do not know how to proceed. I am implementing in C++ (QT).

Thanks in advance,
franckesh

Re: set bits on binary images

Richard MacCutchan2-Dec-09 2:36

Richard MacCutchan

2-Dec-09 2:36

franckesh wrote:
I want to transform a black&white image into a binary image.

I am not sure what you are trying to achieve here, can you clarify your question?

Re: set bits on binary images

franckesh2-Dec-09 2:50

franckesh

2-Dec-09 2:50

Actually I have 2 images with black background and the object on the images are white. What I am trying to do is to compare them with an XOR. In order to do that I need to have them in a binary form(Black = 0 and White = 1). With The XOR operation the results will be "1" where the pixels do not match (1 XOR 0 = 1).

So now I want to figure out with QT how to have these images in a binary form and to perform XOR afterwards.

Thanks for the reply,
Franckesh

Re: set bits on binary images

Richard MacCutchan2-Dec-09 3:21

Richard MacCutchan

2-Dec-09 3:21

franckesh wrote:
So now I want to figure out with QT how to have these images in a binary form and to perform XOR afterwards.

I don't know what QT stands for so I cannot comment on that. However, assuming both images are in the same format you just need to go through them pixel by pixel and compare the colour values. From this comparison you can build the binary array showing where the images are different.

Re: set bits on binary images

CPallini2-Dec-09 8:10

CPallini

2-Dec-09 8:10

Monochrome images already had black and white represented by the pair {0,1} (or viceversa).
Smile | :)

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]

static library dependency walker available?

Chesnokov Yuriy2-Dec-09 1:11

Chesnokov Yuriy

2-Dec-09 1:11

Is there a tool to look into static libraries dependencies (.lib files)?
There are dll dependency walkers available but I could not find the one to dump .lib files contents.

I've got multiple .lib files where I need to discover the dependencies between them without looking into the actual source codes

Чесноков

Re: static library dependency walker available?

Adam Roderick J2-Dec-09 2:02

Adam Roderick J

2-Dec-09 2:02

Take the lib file and check the corresponding DLL with dependency walker and find the dependency, say [^]

Величие не Бога может быть недооценена.

Re: static library dependency walker available?

Chesnokov Yuriy2-Dec-09 2:10

Chesnokov Yuriy

2-Dec-09 2:10

These are not DLL projects!
There are no DLLs in static library projects. Only .lib files are generated, much larger the .lib files supporting DLL modules from DLL libraries projects.

I need dependency walker that works only with .lib files from static library projects

Чесноков

Re: static library dependency walker available?

Saurabh.Garg2-Dec-09 2:08

Saurabh.Garg

2-Dec-09 2:08

As far as I know, in general, this is not possible. Since static libraries do not resolve where a symbols is coming from. So all dependent static libraries must be present when linking a static library.

-Saurabh

Re: static library dependency walker available?

Richard MacCutchan2-Dec-09 2:40

Richard MacCutchan

2-Dec-09 2:40

I don't know of a DW but you might find that the LIB Command[^] will offer some information that may help.

using com

prithaa2-Dec-09 0:49

prithaa

2-Dec-09 0:49

Hello,

I have read about COM programming and now want to use it in VC++ . Which dlls or libraries will i need to use COM.I have done automation and used automation classes to open word excel . Is it very similar to that ? I am confused.

Thank you

Pritha

Re: using com

Richard MacCutchan2-Dec-09 1:35

Richard MacCutchan

2-Dec-09 1:35

prithaa wrote:
Which dlls or libraries will i need to use COM.

It depends what you are trying to do. What functions are you trying to use in your program?

Re: using com

Maximilien2-Dec-09 2:21

Maximilien

2-Dec-09 2:21

prithaa wrote:
I have read about COM programming and now want to use it in VC++

Why do you _need_ to use it ? Is there a particular problem that absolutly have to use COM that cannot be done otherwise ?

Office Automation classes are COM objects (AFAIRemember); so there's a link there.

This signature was proudly tested on animals.

Re: using com

David Crow2-Dec-09 2:56

David Crow

2-Dec-09 2:56

prithaa wrote:
I have done automation and used automation classes to open word excel . Is it very similar to that ?

Yes, that's exactly what COM is. Automation is an IPC mechanism that is based on COM.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: using com

KarstenK2-Dec-09 2:57

KarstenK

2-Dec-09 2:57

But remember the best control you get with C++, so check BEFORE CODING whether all needed features are supported.

This looks like a great article for that stuff:

Accessing Excel Spreadsheets via C++[^]

Press F1 for help or google it.
Greetings from Germany

SetItemText in CListCtrl can't change the first column.

Code-o-mat1-Dec-09 23:13

Code-o-mat

1-Dec-09 23:13

Hey folks!

I have a CListCtrl which is filled with several calls to InsertItem and then later updated by using CListCtrl::SetItemText[^]. This works fine except for the first column, if i do this:

list.SetItemText(rowIndex, 0, "Hello World");

nothing happens, the method returns with nonzero indicating success, GetLastError is zero, but the text is not changed. It works for any other column, so e.g:

list.SetItemText(rowIndex, 1, "Hello World");

works fine. I would like to avoid having to insert new items and deleting old ones when there's an update just because the first column needs updating too. Any ideas why this is happening? I googled some and found similar things but nothing exactly the same or really helpfull.

Thanks for any help in advance.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Re: SetItemText in CListCtrl can't change the first column.

Adam Roderick J1-Dec-09 23:22

Adam Roderick J

1-Dec-09 23:22

I hope u called the InsertItem.

Величие не Бога может быть недооценена.

Re: SetItemText in CListCtrl can't change the first column.

Code-o-mat1-Dec-09 23:34

Code-o-mat

1-Dec-09 23:34

As said, yes. This is a stripped, simplified version what i do:

list.InsertColumn(0, "One");
list.InsertColumn(1, "Two");

list.InsertItem(0, "Hi");

list.SetItemText(0, 0, "Hello");
list.SetItemText(0, 1, "World");

After InsertItem the column "One" contains "Hi" and the column "Two" is empty.
After the first SetItemText the column "One" still contains "Hi" (this is what i don't understand) and the column "Two" is empty
After the second SetItemText column "One" contains "Hi" and column "Two" contains "World".

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Re: SetItemText in CListCtrl can't change the first column.

vasu_sri2-Dec-09 0:19

vasu_sri

2-Dec-09 0:19

if you want set the text of first item, you should call InsertItem().
and if you want set the first column, you call
SetColumn();

Regards,
Srinivas

Convert pointer to zlib stream to string?

o m n i1-Dec-09 23:03

o m n i

1-Dec-09 23:03

I have a z_streamp, which is a pointer to a z_stream_s. z_stream_s is defined as follows:

typedef struct z_stream_s {
    Bytef    *next_in;  /* next input byte */
    uInt     avail_in;  /* number of bytes available at next_in */
    uLong    total_in;  /* total nb of input bytes read so far */

    Bytef    *next_out; /* next output byte should be put there */
    uInt     avail_out; /* remaining free space at next_out */
    uLong    total_out; /* total nb of bytes output so far */

    char     *msg;      /* last error message, NULL if no error */
    struct internal_state FAR *state; /* not visible by applications */

    alloc_func zalloc;  /* used to allocate the internal state */
    free_func  zfree;   /* used to free the internal state */
    voidpf     opaque;  /* private data object passed to zalloc and zfree */

    int     data_type;  /* best guess about the data type: binary or text */
    uLong   adler;      /* adler32 value of the uncompressed data */
    uLong   reserved;   /* reserved for future use */
} z_stream;

I am trying to convery the next_in Byte to a string but I get a c2059 error that doesn't make any sense (it complains about a parenthesis: error C2059: syntax error : ')')

Here is my code:

z_stream_s zs;
zs = *z_stream_in;
  
char dest(StackSizeOf(char));
strcpy(dest,zs.next_in*);

(the *z_stream_in it uses is passed to it by the caller)

I think I may be defining the char wrong but I don't think that's whats causing the error.

Can anyone help please?

Re: Convert pointer to zlib stream to string?

Adam Roderick J1-Dec-09 23:10

Adam Roderick J

1-Dec-09 23:10

I have few doubts

1. What is the type of z_stream_in?
2. Whether StackSizeOf class is defined by you?
3. In
strcpy(dest,zs.next_in*);,
Here what zs.next_in* means?

Величие не Бога может быть недооценена.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.