C / C++ / MFC

4-Jun-06 3:08

As you know, we can lock taskbar manually, But I would like to lock taskbar by my own program. I try to do it by the following code:

DWORD style = GetWindowLong(hShellTrayWnd,GWL_STYLE);
style &= ~WS_SIZEBOX;
SetWindowLong(hShellTrayWnd, GWL_STYLE, style);

Unfortunately, it didn't work as I expected. Does anyone know how to do it?
Your help would be greatly appreciated.

Nothing impossible, Nothing sure

Nibu babu thomas4-Jun-06 18:13

4-Jun-06 18:13

I did do it sometime back but don't have the message number with me now. D'Oh! | :doh:

Maybe I can give it you tomorrow.

This requires you to send a message to the taskbar asking it to lock itself. I did have the number but don't have it now. Smile | :)

Nibu thomas
A Developer

Programming tips[^] My site[^]

NianHawk7-Jun-06 6:38

7-Jun-06 6:38

Hi Tomas,
Your help would be greatly appreciated, in fact I send WM+USER+336 to taskbar, but it didn't work, which make me feel that it can't be done by sending a message.

And then I try another way below:
CToolBar* trayWnd = (CToolBar*)FromHandle(hShellTrayWnd);
DWORD barStyle = trayWnd->GetBarStyle();
barStyle |= CBRS_SIZE_FIXED;
trayWnd->SetBarStyle(barStyle);

It also didn't work, I was really frustrated, the style of taskbar vary every time even though I remove "trayWnd->SetBarStyle(barStyle)".
For example, sometimes barStyle is 380, but sometimes it is 376, and other times, it is another value. it is very strange for me.

Nothing impossible, Nothing sure

Nibu babu thomas7-Jun-06 17:38

7-Jun-06 17:38

NianHawk wrote:
Hi Tomas,
Your help would be greatly appreciated, in fact I send WM+USER+336 to taskbar, but it didn't work, which make me feel that it can't be done by sending a message.

Thanks.

This works on both Windows XP, 2000...

//custom message
#define <code>WM_USERDEF_LOCKTASKBAR </code>424

static HWND hShellWnd = ::FindWindow(_T("Shell_TrayWnd"), NULL);
        
if(hShellWnd != NULL)
  ::PostMessage(hShellWnd, WM_COMMAND, MAKELONG(<code>WM_USERDEF_LOCKTASKBAR</code>, 0), NULL);	
else
  hShellWnd = ::FindWindow(_T("Shell_TrayWnd"), NULL);

This will work! Smile | :)

Nibu thomas
A Developer

Programming tips[^] My site[^]

NianHawk7-Jun-06 19:22

7-Jun-06 19:22

It did work well, thank a lot. I have another question if you wouldn't feel disturbed, Actually I use spy to monitor taskbar, if my program send such WM_COMMAND msg to taskbar, spy can capture it.
But if I do it manually by using winxp functionality, spy didn't show this msg, that is why I always can't get this msg. Could you be so kind to teach me something about it?

Nothing impossible, Nothing sure

Nibu babu thomas7-Jun-06 19:30

7-Jun-06 19:30

NianHawk wrote:
It did work well, thank a lot.

You are Welcome Smile | :)

NianHawk wrote:
I have another question if you wouldn't feel disturbed,

Not at all.

NianHawk wrote:
Actually I use spy to monitor taskbar, if my program send such WM_COMMAND msg to taskbar, spy can capture it.
But if I do it manually by using winxp functionality,

Which functionality! Unsure | :~

NianHawk wrote:
Could you be so kind to teach me something about it?

Can you give me your email. I can send you a sample application, which demonstrates some useful messages related to the TaskBar.

BTW here is a list if you are interested...

/*DisplayStartupMenu*/		305,
/*DisplayRunDialog*/		401,
/*DisplayLogoffDialog*/		402,
/*ArrangeCascade*/		403,
/*ArrangeTileHrz*/		404,
/*ArrangeTileVrt*/		405,
/*ShowDesktop*/			407,
/*ShowDateTimeDialog*/		408,
/*ShowTaskbarPrps*/		413,
/*MinAll*/			415,
/*MaxAll*/			416,
/*ShowDesktop2*/		419, /*Well you need to check this one. Make sure is this minimize all or show desktop.*/
/*ShowTaskMngr	*/		420,
/*TaskBrCustomizeNtfy*/		421,
/*LockTaskbar*/			424,
/*HelpAndSuppCenter*/		503,
/*ControlPanel*/		505,
/*TurnOffCompDialog*/		506,
/*PrintersAndFaxesDialog*/	510,
/*FindFilesDialog*/		41093,
/*FindComputers*/		41094

Nibu thomas
A Developer

Programming tips[^] My site[^]

NianHawk17-Jun-06 5:01

17-Jun-06 5:01

Thanks for your help.

I mis-thought there had not benn reply yet because I didn't receive the response mail as usual, maybe last time I missed to check "Notify me by e-mail if someone answers this message".

My email is : NianHawk@invalid.hotmail.com (please discard "invalid").

Which functionality!

===> I just lock the taskbar by taskbar menu.

Best regards.

Nothing impossible, Nothing sure

Nibu babu thomas18-Jun-06 17:19

18-Jun-06 17:19

NianHawk wrote:
Thanks for your help.

I mis-thought there had not benn reply yet because I didn't receive the response mail as usual, maybe last time I missed to check "Notify me by e-mail if someone answers this message".

My email is : NianHawk@invalid.hotmail.com (please discard "invalid").

Heh don't worry. I wrote an article on this subject. You can get the sample application from here[^]. Hope you will like it.

Nibu thomas
A Developer

Programming tips[^] My site[^]

NianHawk20-Jun-06 6:39

20-Jun-06 6:39

Thanks a lot

Nothing impossible, Nothing sure

Drawing to desktop

Aneurysm004-Jun-06 2:20

Aneurysm00

4-Jun-06 2:20

If I wish to draw a window, or an image onto the desktop, do I use obtain a HWND from GetDesktopWindow() and get a DC from there? I wish to draw onto the desktop , so that my image appears as though it were part of the wallpaper, e.g. all other windows sit on top of it.

Is there another HWND I should be looking for?

Re: Drawing to desktop

ThatsAlok4-Jun-06 19:11

ThatsAlok

4-Jun-06 19:11

Aneurysm00 wrote:
If I wish to draw a window, or an image onto the desktop, do I use obtain a HWND from GetDesktopWindow() and get a DC from there? I wish to draw onto the desktop , so that my image appears as though it were part of the wallpaper, e.g. all other windows sit on top of it.

Create DC by using this method
CDC myDC(NULL);

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Re: Drawing to desktop

FarPointer4-Jun-06 21:09

FarPointer

4-Jun-06 21:09

Hi ,
Do you really have to draw on the desktop ,wont overriding the
CWnd::OnEraseBkgnd of your window work .that will give the same effect as drawing on the Desktop. Please check .

Regards,
FarPointer

recordset problem

SWDevil4-Jun-06 2:04

SWDevil

4-Jun-06 2:04

Hi,

I have an application in which I display records in a grid. I populate the grid using a recordset that contains the results of a query of the database.

The problem is that if I have a large database (about 80,000 records and above..) then it takes a few minutes to load the grid with all of the records.
I need to make this faster... Any ideas?

C^hris L^osinger4-Jun-06 4:21

C^hris L^osinger

4-Jun-06 4:21

don't load all the data at once - only load the data your grid is currently showing.

Cleek | Image Toolkits | Thumbnail maker

SWDevil4-Jun-06 5:08

SWDevil

4-Jun-06 5:08

Yeah - what I thought to do is show the first 400 records (for example), while searching for the other records.
I thought to load the data page by page, and display 400 records in each page.
So, it would work this way: display 400 records, then display another 400 (800 total), then another 400 (1200 total) and so on until I reach 78000 records.
But how can I do this with the recordset object?
Do I have to fill the recordset first with 400 records, then with 800 records, then with 1200 records, and eventually with 78000?

C^hris L^osinger4-Jun-06 5:17

C^hris L^osinger

4-Jun-06 5:17

SWDevil wrote:
So, it would work this way: display 400 records, then display another 400 (800 total), then another 400 (1200 total) and so on until I reach 78000 records.

only load the ones you need to display. if they scroll, load enough new data to complete the grid, and discard the rest.

ideally, if your grid control allows, you can put it in charge of loading the data for the rows it has to display when it needs them. don't make it load data it doesn't need - just let it ask for rows X through Y when it needs to display them, and don't worry about any other rows.

Cleek | Image Toolkits | Thumbnail maker

SWDevil4-Jun-06 5:39

SWDevil

4-Jun-06 5:39

ok - I understand your idea, but I don't understand how to actually implement it...

First of all - how can I know if I can put my grid control in charge of loading the data it needs?

Second - Let's say my grid control can't be put in charge of loading the correct data, how do I implement your idea?
Do I have to perform a new query each time?
For example: "SELECT * FROM TABLE1 WHERE field BETWEEN x and y" and then display the recordset that contains the result set?

Also - won't this solution take a lot of time also? isn't the solution of loading page by page better?