C / C++ / MFC Discussion Boards

Re: Which API can set a image file as wallpaper?

kindows9-Jun-03 4:44

kindows

9-Jun-03 4:44

Try SystemParametersInfo

Re: Which API can set a image file as wallpaper?

Sardaukar9-Jun-03 22:02

Sardaukar

9-Jun-03 22:02

[MSDN October 2001]

IActiveDesktop::SetWallpaper
Sets the wallpaper for the Active Desktop.

HRESULT SetWallpaper(
LPCWSTR pwszWallpaper,
DWORD dwReserved
);

Parameters
pwszWallpaper
String value containing the file name of the wallpaper to be set.
dwReserved
Reserved. Must be set to zero.
Return Values
Returns S_OK if successful, or an OLE error code otherwise.

See Also
IActiveDesktop

Requirements
Version 4.71 and later of Shell32.dll

Windows NT/2000: Requires Windows 2000 (or Windows NT 4.0 with Internet Explorer 4.0 or later).
Windows 95/98/Me: Requires Windows 98 (or Windows 95 with Internet Explorer 4.0 or later).
Header: Declared in Shlobj.h.

So it should work from IE 4.0+. Hope it helps.

For a lower version, try SystemParametersInfo:

BOOL SystemParametersInfo(
UINT uiAction, // system parameter to retrieve or set
UINT uiParam, // depends on action to be taken
PVOID pvParam, // depends on action to be taken
UINT fWinIni // user profile update option
);

SPI_SETDESKWALLPAPER
Sets the desktop wallpaper.

The value of the pvParam parameter determines the new wallpaper.
To specify a wallpaper bitmap, set pvParam to point to a null-terminated string containing the name of a bitmap file.

Setting pvParam to "" removes the wallpaper.
Setting pvParam to SETWALLPAPER_DEFAULT or NULL reverts to the default wallpaper.

Basic understanding question...

CherezZaboro9-Jun-03 4:32

CherezZaboro

9-Jun-03 4:32

Using WSAEvents winsock notifications... Under what circumstances would a client get FD_WRITE and FD_CONNECT at the same time? I mean WSAEnumNetworkEvents gives me 0x12(18) in WSANETWORKEVENTS::lNetworkEvents which to me looks like FD_CONNECT|FD_WRITE.
Confused | :confused:

That throws me off pretty bad.

Re: Basic understanding question...

valikac9-Jun-03 6:35

valikac

9-Jun-03 6:35

Upon an initial connection, the server will trigger both FD_CONNECT and FD_WRITE events.

Kuphryn

Re: Basic understanding question...

CherezZaboro9-Jun-03 7:02

CherezZaboro

9-Jun-03 7:02

Thanks! OK I get it. Now is there any chance or a situation when I will NOT recv the FD_CONNECT notification. May be when ::connect returns success right away - without WSAWOULDBLOCK?
MSDN help is vague on this.

Re: Basic understanding question...

valikac9-Jun-03 7:22

valikac

9-Jun-03 7:22

connect() is a blocking winsock API. If it returns immediately, then yes there is a possibility the process will not receive FD_CONNECT.

Kuphryn

Re: Basic understanding question...

CherezZaboro9-Jun-03 7:36

CherezZaboro

9-Jun-03 7:36

That's strange..
My MSDN in connect() article says:

<br />
For connection-oriented, nonblocking sockets, it is often not possible to complete the connection immediately. In such a case, this function returns the error WSAEWOULDBLOCK. However, the operation proceeds.<br />
<br />
When the success or failure outcome becomes known, it may be reported in one of two ways, depending on how the client registers for notification.<br />
<br />
If the client uses the select function, success is reported in the writefds set and failure is reported in the exceptfds set.<br />
If the client uses the functions WSAAsyncSelect or WSAEventSelect, the notification is announced with FD_CONNECT and the error code associated with the FD_CONNECT indicates either success or a specific reason for failure.<br />

It actualy feels just like WSAConnect and I get notification most of the time but not always.
Should I switch to WSAConnect or what?

Re: Basic understanding question...

valikac9-Jun-03 7:39

valikac

9-Jun-03 7:39

Yes, I highly recommend WSAConnect(). I am not familiar with connect() because I always use WSAConnect() under non-blocking I/O model.

Kuphryn

Layered window problem

Bedas9-Jun-03 4:21

Bedas

9-Jun-03 4:21

Hello,
I'm using the SetLayeredWindowAttributes() function for
setting transparency of a frame window. It works fine but
all window childs (edit boxes, combo boxes ...) are
transparent too. Is it possible to make childs opaque but
with preserving parent transparency ?

Thank you.

Bedas

Re: Layered window problem

Ryan Binns9-Jun-03 4:37

Ryan Binns

9-Jun-03 4:37

You could try calling SetLayeredWindowAttributes() for each child window, but I don't think it would work. I may be wrong though.

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Re: Layered window problem

Bedas10-Jun-03 0:31

Bedas

10-Jun-03 0:31

Thank you, but unfortunately it doesn't work.

Re: Layered window problem

Ryan Binns10-Jun-03 0:51

Ryan Binns

10-Jun-03 0:51

I didn't think it would. I think you're attempting something that Windows does not support. You might have to implement the transparency yourself if you really need this feature. It's not standard and may very well confuse some users.

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

List Control

User 98859-Jun-03 3:49

User 9885

9-Jun-03 3:49

I have a list control with LVS_OWNERDATA style set. This creates one problem for me. When an item is inserted or deleted, the selected index remains the same, but the item at the index may have changed due to the change in the underlying list.

I wanted to know whether anyone else faced this problem, and what was done to rectify it.

My article on a reference-counted smart pointer that supports polymorphic objects and raw pointers

modified 29-Aug-18 21:01pm.

Re: List Control

valikac9-Jun-03 6:37

valikac

9-Jun-03 6:37

How does the program determine which items are selected? One solution is to determine the selected items in the on item change handler. Thus, item insertion will cause windows to send an item change message.

Kuphryn

Re: List Control

User 98859-Jun-03 6:56

User 9885

9-Jun-03 6:56

I use

int index = GetNextItem(previous_index, LVNI_SELECTED);

to get the selected item.

With the OWNERDATA style, I don't have to insert items into the list view control using InsertItem. Rather, I just add items in the underlying container and call SetItemCount() on the control with the number of items.

Say, I was at index 0, and a new item was added at the top of the container. Now the selected index is still 0, but the item that is at that index is the new item. The same problem occurs when the container is sorted.

The only option I can think of now, is to get the object that is in the container at the index before changing it, and then find the index of same object in the modified container, and selecting that item from the code, and then make sure that the item is visible.

I was looking for an easier solution to this Big Grin | :-D

My article on a reference-counted smart pointer that supports polymorphic objects and raw pointers

modified 29-Aug-18 21:01pm.

Re: List Control

valikac9-Jun-03 7:26

valikac

9-Jun-03 7:26

One solution is to update the index database that holds the selected items. Here is one example.

Selected indices:
2
3
5
8
10
13
15

- insert new item at index 0

Now using STL, one solution is to determine where the item was inserted and update the index database.

Updated selected indices:
3
4
6
9
11
12
16

Kuphryn

Getting text into Word

Martyn Pearson9-Jun-03 3:32

Martyn Pearson

9-Jun-03 3:32

I am trying to get RTF text into an MS Word document, using automation. I have a method which works fine, whereby I write the rtf to the file, then call the Range object's InsertFile() method. However, this is a little slow, to say the least.

Any ideas on how I could transfer my text quicker?

Thanks in advance!

Re: Getting text into Word

Ryan Binns9-Jun-03 4:24

Ryan Binns

9-Jun-03 4:24

Word's automation is extremely slow for anything Frown | :(

You can get a bit of a speedup by preventing the changes to be shown by setting Application.ScreenUpdating to false while you insert the file, but this only really works when you're performing more than one operation. Other than this, there's not much you can do.

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Printing

si_699-Jun-03 2:59

si_69

9-Jun-03 2:59

Hi All

i have a CListView project, i would like to capture whats in my list
view and output if for printing, i know i need some kind of pointer to
my list view but im a bit stuck, on what to put in my OnDraw(CDC* pDC)
function to capture whats there

please help

thakns in advance

si

void CCallParentsView::OnDraw(CDC* pDC)
{

}

Re: Printing

Roger Allen10-Jun-03 0:45

Roger Allen

10-Jun-03 0:45

Your OnDraw(0 procedure is part of the window which contains the control, so yuo shoul dbe able to do either of the following:

CListCtrl *pCOntrol = static_cast < CListCtrl* > (GetDlgItem(ID_OF_CONTROL));

or just use the control that was mapped with DDX_Control() call.

You can then loop round using the item count etc. Take a look at some of my printing articles for some tips on printing.

Roger Allen
Sonork 100.10016

Were you different as a kid? Did you ever say "Ooohhh, shiny red" even once? - Paul Watson 11-February-2003

where we used the static functions

Rajesh match9-Jun-03 2:59

Rajesh match

9-Jun-03 2:59

hello bies
I heard lot more about static functions that it access only static variable
it count the number of objects created... and so on

But still i a am unable to known in which condn it shpild be used can any one give me details with small code would apprecitaed

Re: where we used the static functions

David Crow9-Jun-03 5:42

David Crow

9-Jun-03 5:42

They are used whenever you have multiple instances of an object, but only want one instance of a particular function. Callback functions are another example.

Re: where we used the static functions

Rajesh match9-Jun-03 21:21

Rajesh match

9-Jun-03 21:21

Well,
Dear DavidCrow
u say Callback is the example of Static function
callback fuctions r genrally used for repeated works in which we stored the address of the origin and get back after doing some manupulation..
How u relate all these to static functions.
pls explain...

Re: where we used the static functions

David Crow10-Jun-03 2:11

David Crow

10-Jun-03 2:11

class A
{
static int compare( const void *arg1, const void *arg2 );
void SortEm( void );
};

void A::SortEm( void )
{
qsort(..., compare);
}

window focusing problem in a multithreaded service application

sreela9-Jun-03 2:16

sreela

9-Jun-03 2:16

I have a Windows Service created with ATL ComAppWizard.It supports multi-threaded paartments(Run() function of the service has called CoInitializeEx(NULL

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