C / C++ / MFC

.vssscc file and Visual Source Safe

7-Jan-09 5:33

DirectSound has audio capture capabilities[^]. That page also mentions waveInOpen[^], which looks like it does audio capture.

The main trick then is identifying how to specify the line-in port!

Like2Byte7-Jan-09 4:23

Like2Byte

7-Jan-09 4:23

Hello,

I've got a few projects I'm attempting to cleanup. They are all in VSS and in the parent directory for a few projects reside a file with the '.vssscc' extension.

Should they be removed? I thought they were a local repository for what files have been added to VSS. Doing some reading I understand that the information contained in the files is supposed to represent which files to exclude from the project's source tree in VSS.

Upon inspection in find:

""<br />
{<br />
"FILE_VERSION" = "9237"<br />
"ENLISTMENT_CHOICE" = "NEVER"<br />
"PROJECT_FILE_RELATIVE_PATH" = ""<br />
"NUMBER_OF_EXCLUDED_FILES" = "0"<br />
"ORIGINAL_PROJECT_FILE_PATH" = ""<br />
"NUMBER_OF_NESTED_PROJECTS" = "0"<br />
"SOURCE_CONTROL_SETTINGS_PROVIDER" = "PROJECT"<br />
}<br />

which seems to contradict file exclusion.

Is it safe to remove these files from source control?

Need help for numericupdown

sai567-Jan-09 4:18

sai56

7-Jan-09 4:18

Hi~I am working a window form , with a picture box,label and numericUpDown
the picture box's image is like a compass ,when I change the value in numericUpDown->value, it is from 180 to -180, left is +ve and right side is -ve.

The label will show the corresponding value like north,N30E....
but when I work in the from 90 to 180,
what I decide is an eqatuion like numericUpDown->value - 2*n,where n is from 1 to 89.
There is no problem when I increase it from 91 to 179,it will shw the correct value from N89E to N1E, but when from 179 to 91,there will be problem. Moreover, if the numericUpDown->value is just change up and down, bb will also accumulate..so the value display in the label will be wrong...I really don't know how to write...

if(numericUpDown2->Value > 90 && numericUpDown2->Value < 180)
{ //a= numericUpDown2->Value;
cc = Convert::ToDouble(numericUpDown2->Value);
cc=cc-(2*bb);
aa=Convert::ToString(cc);
if(bb<89)
{bb=bb+1;}
else
{bb=1;}
label12->Text="N"+aa+"E";

}

Re: Need help for numericupdown

Iain Clarke, Warrior Programmer7-Jan-09 22:59

Iain Clarke, Warrior Programmer

7-Jan-09 22:59

OK, I am very confused by this. You seem to have 3 things going on, and I'm not sure where the problem actually is. It doesn't help that your code is looking very un-MCF/C++ like. Maybe you should be in the Managed C++/CLI forum?

1/ You have an Up-Down control (which I think of as a spinner, but you're actually correct). I'm confused what you're setting the range to. I think it's from -180 to +180

2/ You handle either the WM_NOTIFY/UDN_DELTAPOS or WM_HSCROLL/WM_VSCROLL messages sent from the up/down control. Do you get the correct values?

3/ Then you have to translate the -180 to +180 bearing value into a nice text representation. You can probably be hyper clever, but I'd suggest you do something like:

if (bearing >= 0 && bearing <= 45)
{
   // set text with WxxxN whatever your format is
} else if (bearing >= 45 && bearing <= 90)
...

As I suspect you're posting in the wrong forum, I'll stop now. But the idea is to just break your problem down into ever smaller bits, and see where you fail.

Iain.

Codeproject MVP for C++, I can't believe it's for my lounge posts...

Concept/example for virtual list

nobaq7-Jan-09 4:10

7-Jan-09 4:10

Hi,

I need to display ~ 100000 entries in a windows list which are stored in an SQL database (queried by a SELECT query with a few JOINs).

1st question: In only need to display a simple list. I would really like to use a Listbox Control for the sake of simplicity. Do I really need to choose a (complex) List Control?

2nd question: I tried a virtual list with a simple SQL query:

OnInitDialog()
...
// SELECT COUNT(*) FROM...
m_ctrlWords.SetItemCountEx(count);
....


OnLvnGetdispinfoWords(...)
...
sql.Format("SELECT keywordID, keyword FROM keywords ORDER BY keyword LIMIT %d, 1", index);
// query
const char *res = query.getStringField("keyword");
lstrcpy(pItem->pszText, res);

but this is really too slow.

I think I need OnLvnOdcachehintWords but it's somehow complicated. I could not find any concepts (which data structure to choose??) or examples concerning this Frown | :-(

The problem is that I have to remove old entried in cache (or my app's memory consumption would explode).

Does anyone have implemented such a virtual list (with data in SQL) already?

Are there some examples or concepts available?

Thank you very much,
Niki

Stuart Dootson7-Jan-09 4:34

7-Jan-09 4:34

You'll probably be better off executing something like "SELECT keywordID, keyword FROM keywords ORDER BY keyword" within OnInitDialog and caching the results in a resultset or whatever equivalent your database interface technology offers. Then you can interrogate the cache within OnLvnGetdispinfoWords and don't need to bother with OnLvnOdcachehintWords.

nobaq7-Jan-09 5:35

7-Jan-09 5:35

Hello,

I have to correct: The entries are much more than 100000...it's a fulltext recherche of a huge database system.

So it's definitifely too large to just read out all entries and cache them.

Regards,
Niki

nobaq7-Jan-09 6:04

7-Jan-09 6:04

I have tried it using caching and virtual list controls. Even if I read only the elements from LVN_ODCACHEHINT and cache them into a map, the list is really, really tooo slow.

What could be the solution? I just want to have the same as WinHelp32's keyword (or topic) search. For some reason, this list is very very fast since over 10 years (with slow computers).

Regards,
Niki

Stuart Dootson7-Jan-09 8:44

7-Jan-09 8:44

nobaq wrote:
I have tried it using caching and virtual list controls. Even if I read only the elements from LVN_ODCACHEHINT and cache them into a map, the list is really, really tooo slow.

I'm surprised - I've implemented virtual lists that provide views over 10s of thousands of rows (and 10s of columns) of data - they've been as quick as you could want.

I feel sure you're using the right technology (virtual list controls) but there's something not quite right about your implementation?

Stuart Dootson7-Jan-09 8:49

7-Jan-09 8:49

One other thing - have you profiled the code to see what is slowing it down?

I'd suggest implementing a virtual list control that just displays the numeric index of the list rows, to convince yourself that you've got the virtual list control set up correctly. Then work out how much of the SQL query you can do without taking too much time, and you can try to merge that into the list control implementation?

Stuart Dootson7-Jan-09 8:40

7-Jan-09 8:40

OK - in that case, you want to cache maybe a couple of hundred rows starting at the row that's at the top of the list control. Then, as users move down the list, you can retrieve a few hundred rows at intervals, when required?

David Crow7-Jan-09 5:33

David Crow

7-Jan-09 5:33

nobaq wrote:
I need to display ~ 100000 entries in a windows list...

Why? Who would want to navigate through such a list?

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

nobaq7-Jan-09 6:00

7-Jan-09 6:00

Just look at winhelp32 fulltext- or keyword search.

This is exactly what I want to implement.

Regards,
Niki

Maximilien7-Jan-09 5:42

Maximilien

7-Jan-09 5:42

Use a CListBox,in virtual mode.

If I remember correctly, You will need to manually draw and manage the data, but it will make the CListBox
very fast; once you know how to do it, you will use it everywhere.

You will need to override the CListBox::DrawItem (and maybe the CListBox::MeasureItem )

nobaq7-Jan-09 7:17