Re: How to reuse the WebBrower control in my c# windows application - C# Discussion Boards

Re: Testing for whole number

9-Feb-03 11:30

How would I find out if the following was a whole number?

As floats

10/6 = 1.666666666666667
10/2 = 2.0

Jon Sagara9-Feb-03 11:40

Jon Sagara

9-Feb-03 11:40

You can do a modulus operation to find out if the remainder is 0:

10%2 = 0 (10/2 = 5 r 0)
10%6 = 4 (10/6 = 1 r 4) <-- not a whole number

Jon Sagara

Hi! I'm Melanoma, Moley Russell's wart.
-- Uncle Buck

Re: Testing for whole number

draco_iii9-Feb-03 13:51

9-Feb-03 13:51

Thanks that will work great.

TreeView selection

Mr BallyDaHob9-Feb-03 4:59

Mr BallyDaHob

9-Feb-03 4:59

Hi All,
How do I enable multiple selection in a TreeView?
cheers,
Donal

Re: TreeView selection

Stephane Rodriguez.9-Feb-03 5:37

TrackpopupMenu(Ex) problem

9-Feb-03 5:37

<shameless plug>
multiselection tv[^]
</shameless plug>

Thomas Caudal9-Feb-03 2:32

Thomas Caudal

9-Feb-03 2:32

I try to display the shell context menu of a file. When I get the
IContextMenu, I want to track the selected menuitem with the
TrackPopupMenu API call.

Here's the call :

int num = TrackPopupMenu(<br />
    menuHandle, // Handle of the menu<br />
    TPM.TPM_RETURNCMD | TPM.tpm,<br />
    pos.X, pos.Y,<br />
    handle, // Handle of my form<br />
    IntPtr.Zero);

The declarations :

public enum TPM :long<br />
{<br />
    TPM_LEFTBUTTON     = 0x0000L,<br />
    TPM_RIGHTBUTTON    = 0x0002L,<br />
    TPM_LEFTALIGN      = 0x0000L,<br />
    TPM_CENTERALIGN    = 0x0004L,<br />
    TPM_RIGHTALIGN     = 0x0008L,<br />
    TPM_TOPALIGN       = 0x0000L,<br />
    TPM_VCENTERALIGN   = 0x0010L,<br />
    TPM_BOTTOMALIGN    = 0x0020L,<br />
    TPM_HORIZONTAL     = 0x0000L,<br />
    TPM_VERTICAL       = 0x0040L,<br />
    TPM_NONOTIFY       = 0x0080L,<br />
    TPM_RETURNCMD      = 0x0100L,<br />
    TPM_RECURSE        = 0x0001L,<br />
    TPM_HORPOSANIMATION = 0x0400L,<br />
    TPM_HORNEGANIMATION = 0x0800L,<br />
    TPM_VERPOSANIMATION = 0x1000L,<br />
    TPM_VERNEGANIMATION = 0x2000L,<br />
    TPM_NOANIMATION     = 0x4000L,<br />
    TPM_LAYOUTRTL       = 0x8000L,<br />
}<br />
[DllImport("user32.dll", SetLastError=true)]<br />
public static extern int TrackPopupMenu(<br />
    IntPtr hmenu,<br />
    TPM fuFlags,<br />
    int x,<br />
    int y,<br />
    IntPtr hwnd,<br />
    IntPtr rect);

The menu is always displayed on the left side only even if the x value
is greater than 0...

Note that I know that the declaration of the API call is false :
normally, there is a "int res" between the y and the hwnd parameters.
But when I add "int res", the menu is no more displayed.

I also tried to use TrackPopupMenuEx but the menu is also not showed...

I have Windows XP Pro SP1.

Thank you

How to reuse the WebBrower control in my c# windows application

ybw9-Feb-03 0:54

ybw

9-Feb-03 0:54

Who can tell me how to reuse the Microsoft WebBrower control in C#?
I reference the method Navigate2,but the webpage opened didn't display images.
Below show my codes:
Object objUrl="http://www.yahoo.com";
Object obj=null;
axWebBrower1.Navigate2(ref objUrl,ref obj,ref obj,ref obj,ref obj);

Please help me!

Re: How to reuse the WebBrower control in my c# windows application

PianoJazz10-Feb-03 4:42

PianoJazz

10-Feb-03 4:42

Rather than setting the obect to null, consider using the System.Reflection.Missing value. Also, I use the Navigigate
method rather than Navigate2. Someone might tell us the
difference other than how the URL is passed?

object missingVal = System.Reflection.Missing.Value;
string address = "http://www.yahoo.com";
axWebBrowser1.Navigate(address, ref missingVal, ref missingVal,
   ref missingVal, ref missingVal);

Microsoft Windows Installer

Jassim Rahma9-Feb-03 0:05

Jassim Rahma

9-Feb-03 0:05

Can I get the Microsoft Windows Installer packaged separately if I don't have the visual studio.NET?

Jassim Rahma

Fast ListView

eytan levit8-Feb-03 23:03

eytan levit

8-Feb-03 23:03

Hi,

I've got a huge log-file, i'm intrested in displaying it with a ListView style control, the problem is that these controls can't handle alot of data.

My thoughts were:
1. Find a ListView control that knows to handle alot of rows.
problem: can't find one.
2. Create a "Virtual ListView", meaning, the ListView contains only a specific subset of the data, when the user scrolls, i read for the new data.
problem: not only that I don't have a clue how to do that, but i think it will be problematic when the user scrolls alot(it means i have to read fast).

Anyone's got an idea?

Thanks in advance,

Eytan

Stephane Rodriguez.8-Feb-03 23:54

8-Feb-03 23:54

Answer 2 is the right one. You'll have to manage the scrolling itself, reflected by the WM_VSCROLL and WM_HSCROLL messages (along with combination of codes LINE, PAGE, ...). My recommendation is to download a Petzold sample called GDIDEMO2 (google!). That's old stuff from a MFC programming book, however that's the simplest and most reusable thing I can think of.

eytan levit8-Feb-03 23:57

eytan levit

8-Feb-03 23:57

Didn't understand from your post:
Is the message loop and message handling exposed by .net, or are you suggesting i Write it with MFC?

Thanks,

Eytan

Stephane Rodriguez.9-Feb-03 0:03

9-Feb-03 0:03

Any .NET winform control exposes a WndProc method and heavily relies on it. Override it and process the mentioned messages. Since scroll messages passing through .NET controls are exactly those from WIN32 controls, you can rely on ready-to-use code. Now, that's up to you...

eytan levit9-Feb-03 2:25

eytan levit

9-Feb-03 2:25

Thanks alot,

I'd like to use your advice in another thing related to this application.
Again, this application is pretty simple,
There is a Log-file which is written in very high-rates.
My application(called LogMon) reads the Log-file when it changes and saves in its memory only the last 600 or so records.
When the user scrolls up and back down, i calculate the records that should be loaded and load them before he scrools up to them.

Anyway,
I thought that maybe the whole idea of reading from a file is pretty slow,and came up with the following idea.
I split the LogMon to 2 apps:
* LogMon File2DB
* LogMon Gui

LogMon File2DB:
---------
Reads lines appended to file, and inserts them into a local\remote DB.

LogMon Gui:
---------
Reads the DB and updates when DB has new records.
This makes the GUI much faster and much easier to implement the "virtual ListView".

Quetsions:
1. Will this be faster?
2. regarding the LogMon File2DB, say the parsed log-file has a changing format, meaning there can be some log-files, each one with different format, is there any way, maybe with XML of defining dynamically the structure of the log-file?

Thanks ,

Eytan

Stephane Rodriguez.9-Feb-03 2:50

Adding the contents of a Graphics class to another Graphics Class.....

9-Feb-03 2:50

eytan levit wrote:
Will this be faster?

Depending on whether the begin or the end of the logfile is mostly interesting, I would seek to either the begin or the end of the file, and only load a chunk, then build the list view out of it.

eytan levit wrote:
regarding the LogMon File2DB, say the parsed log-file has a changing format, meaning there can be some log-files, each one with different format, is there any way, maybe with XML of defining dynamically the structure of the log-file?

I don't think the structure of a log file changes much, regardless of the application it is used for. A log file has several common fields including "date, user, log class family, severity, description". If that's a log of c++ code, then you add custom records like module name, filename, line. But that's pretty much all about it.
Even though I believe that's would be too much efforts here, your code could read the log structure out of a config file (ini, csv, xml). I believe there are a few ready-to-use log managers here in Cp.

Jon Newman8-Feb-03 6:34

Jon Newman

8-Feb-03 6:34

I'm trying to get the contents of the AxWebBrowser.CreateGraphics(); to a PrintEventArgs.Graphics object. The desired effect is to be able to have the contents of a web page displayed on a printed page with my own graphics printed too. Like a nice title or a surrounding box for the page.

Any ideas?

"Where would you rather be today?"

zeroing a byte array

monrobot137-Feb-03 11:30

monrobot13

7-Feb-03 11:30

I'm new to .NET so perhaps I'm missing something obvious, but is there a simple way to zero a byte array. I have this code:

byte[] byteArray = new byte[some size];

now is there a way to zero that array so that I can use it again?

Also another quick question. Is there a way to set the default button in the form designer? I know there's an IsDefault property but I can't find a way to set it in the designer.

Thanks in advance.

- monrobot13

Re: zeroing a byte array

Nnamdi Onyeyiri7-Feb-03 11:54

Nnamdi Onyeyiri

7-Feb-03 11:54

im not 100% what you mean, but if you want to reuse byteArray, you can just do this.

byte[] byteArray = new byte[10];
 
// do something with it here.
 
byteArray = new byte[255];
 
// do something else with it here.

1001111111011101111100111100101011110011110100101110010011010010
Sonork | 100.21142 | TheEclypse

Re: zeroing a byte array

monrobot137-Feb-03 12:37

monrobot13

7-Feb-03 12:37

that's sort of what I'm looking for, here's my code:

byte[] readBytes = new byte[tcpPop3.ReceiveBufferSize];

// Here is there any way to just zero the array instead of using
// new again?  The buffer is always the same size so it seems
// like using new is overhead that isn't needed.
readBytes = new byte[tcpPop3.ReceiveBufferSize];

Perhaps I'm wrong but any help is appreciated.

Thanks Again

- monrobot13

Re: zeroing a byte array

David Stone7-Feb-03 18:45

David Stone

7-Feb-03 18:45

Nope. That looks as if that's how you're gonna have to do it. There is no instruction in IL for redimensioning an array...so it looks as if you're gonna have to do this. Even the Applied Microsoft .NET Framework Programmg book says that you're gonna have to do this or use the Array.CreateInstance static method to do that.

Hey, what can I say? I'm a chick magnet...a babe conductor...a logarithm for the ladies.
-Strong Bad from HomeStarRunner.com

Essential Tips for Web Developers

The correct way

leppie7-Feb-03 21:51

leppie

7-Feb-03 21:51

From MSDN:

Array.Clear Method [C#]

Sets a range of elements in the Array to zero, to false, or to a null reference (Nothing in Visual Basic), depending on the element type.

public static void Clear(
Array array,
int index,
int length
);

Parameters
array
The Array whose elements need to be cleared.
index
The starting index of the range of elements to clear.
length
The number of elements to clear.

Also from MSDN:
Form.AcceptButton Property [C#]

Gets or sets the button on the form that is clicked when the user presses the ENTER key.

public IButtonControl AcceptButton {get; set;}

Property Value
An IButtonControl that represents the button to use as the accept button for the form.

Remarks
This property allows you to designate a default action to occur when the user presses the ENTER key in your application. The button assigned to this property must be an IButtonControl that is on the current form or located within a container on the current form.

You can use this property to allow the user to quickly navigate a simple form by allowing them to simply press the ENTER key when they are finished instead of manually clicking the accept button with their mouse.

The accept button may not be activated if the currently selected control on the form intercepts the ENTER key and processes it. For example, a multiline text box control allows the ENTER key to be pressed when it is selected to insert a new line character in the control.

MyDUMeter: a .NET DUMeter clone

Re: The correct way

monrobot138-Feb-03 10:21

monrobot13

8-Feb-03 10:21

THANK YOU VERY MUCH!

Your help is as always very much appreciated!

Changing the Cursor hotspot at run-time

draco_iii7-Feb-03 7:28

Re: Changing the Cursor hotspot at run-time

7-Feb-03 7:28

Does anyone know how to change the cursor's hotspot at run-time?

Jeff J7-Feb-03 8:58

Jeff J

7-Feb-03 8:58

Hotspots are specified within cursors themselves, so you need to dynamically change the cursor to one that has the particular hotspot coordinates you desire. So you will need to create your own cursor(s). Then you can just do:

Cursor.Current = new Cursor("C:\\MyAppDir\\MyCursor.cur");

Cheers

Re: Changing the Cursor hotspot at run-time

draco_iii9-Feb-03 11:39