DllImport - C# Discussion Boards

Re: Sharepoint Development - Where to Start?

ToddHileHoffer17-Feb-09 6:26

17-Feb-09 6:26

You can use the sharepoint webservices instead of the object model, or develop on a server OS. You can't use the sp object model on XP.

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Re: Sharepoint Development - Where to Start?

rkajal17-Feb-09 6:40

rkajal

17-Feb-09 6:40

Thanks for your reply Smile | :)

I can just reference the web service on the server then?

My server is running as a VM on the same machine with a bridged network.

How can I include the following in my project then?

using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;

Re: Sharepoint Development - Where to Start?

ToddHileHoffer17-Feb-09 6:58

ToddHileHoffer

17-Feb-09 6:58

To use the above in a project you need VS 2005 installed on a win 2K3 server OS.

http://msdn.microsoft.com/en-us/sharepoint/default.aspx[^]

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Re: Sharepoint Development - Where to Start?

led mike17-Feb-09 7:08

led mike

17-Feb-09 7:08

DUDE! You can't show people where the documentation is, it's a secret! Imagine what would happen to these and other forums if developers started using Google to find and then read documentation!

Laugh | :laugh:

Re: Sharepoint Development - Where to Start?

rkajal17-Feb-09 10:11

rkajal

17-Feb-09 10:11

Shut it you! I'm gonna join your geeky club if it kills me Big Grin | :-D

Re: Sharepoint Development - Where to Start?

led mike17-Feb-09 11:04

led mike

17-Feb-09 11:04

xcvsdfsdf wrote:
I'm gonna join your geeky club if it kills me

Ok, we don't have stringent qualifications, your in! Thumbs Up | :thumbsup:

Now you have to guard the secret documentation! Laugh | :laugh:

Re: Sharepoint Development - Where to Start?

rkajal17-Feb-09 10:13

rkajal

17-Feb-09 10:13

Thanks - I'm trying to follow an example in a book and I was dreading what it meant, that I'd have to install VS2K5 on the OS VM Frown | :(

Ah well

DllImport

Alessio Granzotto17-Feb-09 5:44

Alessio Granzotto

17-Feb-09 5:44

Hi, i have two function:
long ImageFileOpen (long *hImageFile, char *szFileName, long bWrite)
Parameters:
hImageFile
Image file handle is returned here.
szFileName
File name of the image file.
bWrite
0 = open file for reading, 1 = open file for writing.
and
long ImageFileRead(long hImageFile, long *hImage)
Parameters:
hImageFile
Image file handle that was created by previous call to ImageFileOpen.
hImage
Image handle of a new image is returned here.

i have called them in this way:
[DllImport("xxx.dll")]
unsafe public static extern long ImageFileOpen(long* hImageFile, [MarshalAs(UnmanagedType.LPStr)] StringBuilder szFileName, long bWrite);

[DllImport("xxx.dll")]
unsafe public static extern long ImageFileRead(long hImageFile, long* hImage);

and then with:
long hImageFile=0;
long hImage=0;

StringBuilder fullname = new StringBuilder(@"c:\xxx.tif");
rc = ImageFileOpen(&hImageFile, fullname, 0);
rc = ImageFileRead(hImageFile, &hImage);
...but at ImageFileRead the compiler says "System.AccessViolationException".
why? thank you very much...I need help...
Alessio

Re: DllImport

Luc Pattyn17-Feb-09 6:16

Luc Pattyn

17-Feb-09 6:16

Hi,

I would try that differently:

1.
in this situation there is no need for pointers and unsafe keyword, just use the IntPtr class (it takes 4 or 8 bytes depending on Win32/Win64).

2.
read-only strings can be passed to a char* as is; a StringBuilder is required only if the native code needs to provide or modify the string value (use a StringBuilder.ToString when done).

3.
an output parameter needs the out (or ref) keyword; that basically takes care of the indirection,
i.e. the variable gets then passed by reference automatically.

4.
warning: in C# long takes 8 bytes, in the native world long usually is 4 B.

So I would try this:

[DllImport("xxx.dll")]
public static extern long ImageFileOpen(out IntPtr hImageFile, string szFileName, bool bWrite);

[DllImport("xxx.dll")]
public static extern long ImageFileRead(IntPtr hImageFile, out IntPtr hImage);

IntPtr hImageFile;
IntPtr hImage;

rc = ImageFileOpen(out hImageFile, fullname, false);
if (rc...) ...
rc = ImageFileRead(hImageFile, out hImage);

Now the tricky part could be what comes next: how will managed code access the content of the image?

Smile | :)

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modified on Sunday, June 12, 2011 8:15 AM

Re: DllImport

Alessio Granzotto17-Feb-09 6:30

Alessio Granzotto

17-Feb-09 6:30

ty very much Luc....it's work.....
so the problem was the indirection? And the out takes care of it? So i don't have to use a fixed *.

Re: DllImport

Mirko198018-Feb-09 3:32

Mirko1980

18-Feb-09 3:32

Now the tricky part could be what comes next: how will managed code access the content of the image?

:)

Can I answer?
System.Drawing.Image.FromHbitmap Smile | :)

Re: DllImport

Luc Pattyn18-Feb-09 3:45

Luc Pattyn

18-Feb-09 3:45

Mirko1980 wrote:
Image.FromHbitmap

Sure, but then why the native detour, why not just Image.FromFile(), that does accept TIFF files doesn't it?

Unless something tricky is going on in the native read function, I was expecting the OP to be interested in parts of the image file, not the entire image.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

modified on Sunday, June 12, 2011 8:15 AM

Masked Textbox Prompt

Lodeclaw17-Feb-09 5:38

Lodeclaw

17-Feb-09 5:38

Hello!

I've been having some issues with masked textboxes and have been unable to find a solution, so I hope one of you knowledgeable forumers can point me in the right direction.

Let's say for example I have a masked textbox and I want to restrict it to a 4digit numeric-only ID#. The Mask is set as "0000" and the PromptChar is "_". My problem arises when I run the project and enter the textbox. The | is placed at the end of the Prompt "____" and in order to input the data I want properly I need to backspace, key over, or click to the beginning of the string.

How can I have a masked textbox always place the data entry marker (what's it called?) at the beginning of the Prompt string when the textbox becomes the selected control?

Any help would be hugely appreciated. Thanks in advance!

Re: Masked Textbox Prompt

Nagy Vilmos17-Feb-09 5:58

Nagy Vilmos

17-Feb-09 5:58

use the SelectionStart property to set the position of the cursor (with nothing selected)

Panic, Chaos, Destruction.
My work here is done.

Re: Masked Textbox Prompt

Lodeclaw17-Feb-09 6:01

Lodeclaw

17-Feb-09 6:01

It baffles me why this property isn't actually IN the properties list for masked textboxes! Thanks william. Am I going to have to use an Enter event for every masked textbox in order to do this?

Re: Masked Textbox Prompt

Nagy Vilmos17-Feb-09 6:14

Nagy Vilmos

17-Feb-09 6:14

I don't know why the control can't have some sane behaviour.
It is rather pants, btu there you go. Try writting a single Enter event handler and using it to for all your controls.

Panic, Chaos, Destruction.
My work here is done.

Re: Masked Textbox Prompt

Lodeclaw17-Feb-09 6:29

Lodeclaw

17-Feb-09 6:29

private void txtCustID_Enter(object sender, EventArgs e)
        {
            txtCustID.SelectionStart = 0;
        }

Am I using the property incorrectly? I'm still having the same problem.

Re: Masked Textbox Prompt

Nagy Vilmos17-Feb-09 23:19

Nagy Vilmos

17-Feb-09 23:19

You are using the property well, but on checking back you have the wrong event:

private void maskedEdit_GotFocus(object sender, EventArgs e)
{
    MaskedTextBox mtb = (MaskedTextBox)sender;
    mtb.SelectionStart = 0;
}

It appears that after the Enter event, the selection is set to the previous values. But if you use GotFocus it works. Just add the event handler manually after InitializeComponent in the constructor:

InitializeComponent();
maskedTextBox1.GotFocus += new EventHandler(this.maskedEdit_GotFocus);
maskedTextBox2.GotFocus += new EventHandler(this.maskedEdit_GotFocus);

Panic, Chaos, Destruction.
My work here is done.

Thread.Sleep(0) action?

Bruce Coward17-Feb-09 5:25

Bruce Coward

17-Feb-09 5:25

Does Thread.Sleep(0) allow the time slicer to start the next thread straight away or does it just idle the cpu in the existing thread until the next thread is scheduled to start?

Thanks, Bruce Confused | :confused:

Re: Thread.Sleep(0) action?

Nuri Ismail17-Feb-09 5:31

Nuri Ismail

17-Feb-09 5:31

The answer is here[^]

" Specify zero (0) to indicate that this thread should be suspended to allow other waiting threads to execute. Specify Infinite to block the thread indefinitely. "

Re: Thread.Sleep(0) action?

Bruce Coward17-Feb-09 5:51

Bruce Coward

17-Feb-09 5:51

That is how I had interpreted the MSDN info but my hardware vendor is telling me that the balance of the thread time idles the cpu before relinquishing the thread. Does anybody know if the time slicer can detect this sleep(0) to switch the time slice early?

Re: Thread.Sleep(0) action?

Luc Pattyn17-Feb-09 6:24

Luc Pattyn

17-Feb-09 6:24

Bruce Coward wrote:
my hardware vendor is telling me that the balance of the thread time idles the cpu

that is nonsense. Every Thread.Sleep tells the scheduler to go and reschedule threads, i.e. continue working on the highest-priority ready thread; if the caller happens to be the only ready thread, it will continue working immediately. A scheduler is not supposed to idle until a tick occurs, when there is work to do (i.e. there are ready threads), then at least some of it should be taken on immediately. What would be the point to halt the CPU till the end of the current tick???

I have developed my share of embedded operating systems, and used some commercial ones, I've never seen one that deliberately did nothing for a while, not even Windows. Big Grin | :-D

Luc Pattyn [Forum Guidelines] [My Articles]

modified on Sunday, June 12, 2011 8:14 AM

Re: Thread.Sleep(0) action?

PIEBALDconsult17-Feb-09 6:33