C# Discussion Boards - CodeProject

Re: Check if user can write and delete from a directory

PIEBALDconsult26-Jul-10 3:02

26-Jul-10 3:02

Sure, so just before you start, begin writing the log file -- "Processing begun by <user> at <date time> ... Reading file <filename> ... "

RCoate wrote:
Life would be so much easier without users.

Yes, yes it is. I write mostly Windows Services and batch processing.

Capture streaming video - (create bitmap)

Mark H Bishop25-Jul-10 11:41

Mark H Bishop

25-Jul-10 11:41

Our watershed group has an IP camera that serves a video stream via a java applet. When we navigate to the camera's web page we see the video streem. The front end of thecode behind the camera's serving page is Is included below.

I am writing a C# Windows Application that has a webbrowser control that navigates to the page. I want to capture still images with a timer tick event. Right now, I have an hack that does a copy from screen on the webbrowser control:

Bitmap BMP_now = new Bitmap(webBrowser1.ClientSize.Width, webBrowser1.ClientSize.Height);
Graphics g = Graphics.FromImage(BMP_now);
g.CopyFromScreen(this.PointToScreen(webBrowser1.Location), new Point(0, 0), webBrowser1.ClientSize);
g.Dispose();

This cumbersome approach has the major drawback that the windows form must always be topmost. There's gotta be a better way.

Here's the source behing the IP Camera's page:

lt;html>
<head>
<TITLE>TRENDnet | CS-7835E0(TV-IP100)</TITLE>
<META http-equiv=Content-Type content="text/html; charset=windows-1252">
<link rel="stylesheet" href="style.css" type="text/css">
<script language="JavaScript"> 
<!--
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
 
function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}
 
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
 
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
 
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->
</script>
<style type=text/css> 
A:link {FONT-WEIGHT: bold; FONT-SIZE: 14px; COLOR: ff6600; FONT-FAMILY: arial,geneva,sans-serif}
A:visited {FONT-WEIGHT: bold; FONT-SIZE: 14px; COLOR: ff6600; FONT-FAMILY: arial,geneva,sans-serif}
.org-news {FONT-WEIGHT: bold; FONT-SIZE: 12px; COLOR: ff6600; FONT-FAMILY: arial,geneva,sans-serif}
</style>
</head>
 
<script language="JavaScript"> 
function Init() {
    if ((navigator.appName != "Netscape") &&
        (navigator.userAgent.indexOf('Opera') == "-1"))
    {
       window.setInterval("ShowFrameRate()", 1000);
    }
}
 
function ShowFrameRate() {
    if (1)
    {
       var fFrameRate = cvcs.GetFrameRate();
       window.status = "Frame:" + fFrameRate.toString() + " fps";
    }
    cvcs.GetRealTimeData() ;
    CurrentTime.innerHTML = cvcs.GetTimeString();
    GetTrigger();
}
 
function GetTrigger() {
    if (cvcs.GetImageUpload() == 1) {
       ImageUpload.innerHTML = "[ON]";
    }
    else {
       ImageUpload.innerHTML = "[OFF]";
    }
    if (cvcs.GetImageEmail() == 1) {
       EmailImage.innerHTML = "[ON]";
    }
    else {
       EmailImage.innerHTML = "[OFF]";
    }
}
</script>

Re: Capture streaming video - (create bitmap)

Mark H Bishop26-Jul-10 12:31

Mark H Bishop

26-Jul-10 12:31

OK, so I discovered the mshtml namespace.

There is a tutorial at http://www.developerfusion.com/code/4712/generate-an-image-of-a-web-page/[^]

The example uses an interface (IHTMLDocument2) and creates an instance of another interface (IHTMLElement) from the document's body. From here it is a render and draw operation. Trouble is, the procedure does not render the applet's stream to the page. Rather, it shows the (blank) html target page that the applet streams into.

However, the mshtml namespace appears to be rich in interfaces, none of which are well documented. It appears that IHTMLElement can be instantiated with other document properties (besides “body) such as “applet” which in turn has an items collection. I have had no luck on this glory path yet. Any ideas?

convert an array of string

mrkeivan25-Jul-10 10:59

mrkeivan

25-Jul-10 10:59

Hey guys, I ve got this question, I tried to look for it online but haven't been lucky!
I've got this:

string[] names = new string[] { "Alan Smith", "Anne Dodsworth", "Boyan Mastoni", "Richard Duncan"};

Now I want to fill it from database, so I used a generic list

public List<string> ClassroomList = new List<string>();

then fill it with data from database,
but when I want to assign it to my string I get an error and can't convert it ....

string[] names = new string[10];
foreach (var item in ClassroomList)
{
    for (int i = 0; i < names.Length; i++)
    {
        names[i] = item;
    }
}

please help me out.

thanx

Re: convert an array of string

harold aptroot25-Jul-10 11:05

harold aptroot

25-Jul-10 11:05

What you are doing there is very odd, filling the array first with the first item, then with the second item, etc.. Eventually you'd have an array with 10 times the same string (the last one in ClassroomList), not a very useful way to spend CPU cycles.

What is your intent? What is the error?

Re: convert an array of string

Luc Pattyn25-Jul-10 11:20

Luc Pattyn

25-Jul-10 11:20

public List<string> ClassroomList = new List<string>();
...
string[] names=ClassroomList.ToArray();

would probably do it (and it takes care of the array dimension as well, without imposing an artificial limit such as the 10 you had).

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

Re: convert an array of string

PIEBALDconsult25-Jul-10 12:10

PIEBALDconsult

25-Jul-10 12:10

0) Don't use var

1) Don't use foreach in this case

2) Why copy a perfectly good List to an array?
3) If you need an array, why use the List?

Re: convert an array of string

Luc Pattyn25-Jul-10 12:55

Luc Pattyn

25-Jul-10 12:55

there's more questions than answers here.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

Re: convert an array of string

PIEBALDconsult25-Jul-10 13:02

PIEBALDconsult

25-Jul-10 13:02

It's a reply.

Secure storage

L Viljoen25-Jul-10 9:02

L Viljoen

25-Jul-10 9:02

Hi

I have an application that uses a 3rd party API that saves a fingerprint image to file,I cannot retrieve the image in any way to a image object in the programming code so I need to save it to disk before i can load it into an Image object to convert the minutiae template between different vendor types. Now due to information law I need to protect that saved fingerprint image, even for the split second it is on the drive before i delete it

So I need to know is there a way I can either
Create a folder, storage space I can save to that only my Assembly can access.
or
Create a virtual drive that encrypts data that gets written into it.
or
Create a folder that requires a password to access it (which I can parse through my program).

Primarily i am using C# to code this application but any C++ console wrapped app that can be of use to me would also help.

Any advice or help will be appreciated.
Hitting my head against the wall on this one

Chona1171
Web Developer (C#), Silverlight