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Could you give me the best books in that ?
Thank you very much 
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Just about anything by Sells, Richter, Box, and Griffiths should suffice. I'd recommend Ian Griffith's .NET Windows Forms in a Nutshell, but that's just my opinion.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: How 'bout a little guitar now?
The apostle Paul, modernly speaking: Epistles of Paul
Judah Himango
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I have Use a Win32-API in a C# project.
I want to use P/Invoke to call the functions from the dll, in my WinForm.
Question 1
Is it possible to define the signature of all the methods I need in a seperate class, create the object of that class in my Form and use it to access the methods I need.
Questions 2
Do I have define the other stucts and variables or the methods alone.
Can any1 plz help me out
-- modified at 9:04 Thursday 6th April, 2006
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1. You wouldn't create an object of that class to access the methods since all of these methods are static. You would need a separate class like this:
public class Win32
{
[DllImport("user32.dll")]
public static extern int SendMessage( IntPtr hwnd, uint uMsg, IntPtr wParam, IntPtr lParam);
}
2. I am not sure what you mean, but if there are some Win32 calls that use structures then you would have to define those in your code.
I hope this helps.
Deus caritas est
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1. I want to keep the api reference calls separete from the winform in my winform, thats why i wanted to call the api methods indirectly
Method call Method Call
My WinForm ------------------> My Class --------------->API
So I would call the methods of MyCalss through its object created in My WinForm. Which inturn calls the appropriate methods from the API.
Tell me If I am heading in the wrong direction.
2. I mean that If the methods of api has params (defined in structs in api).
o O º(`'·.,(`'·., ☆,.·''),.·'')º O o°
»·'"`»* *☆ t4ure4n ☆* *«·'"`«
°o O º(,.·''(,.·'' ☆`'·.,)`'·.,)º O o°
-- modified at 6:20 Friday 7th April, 2006
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Here is what it will look like:
class MyForm : Form
{
protected override void OnLoad()
{
Win32.MessageBox( this.Handle, "Text here", "Caption", 0 );
}
}
class Win32
{
[DllImport("user32.dll")]
public static extern int MessageBox(IntPtr hwnd, [MarshalAs(UnmanagedType.LPTStr)] string msg, [MarsalAs(UnmanagedType.LPTStr)] string caption, int flags);
}
I hope this helps.
Deus caritas est
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so... any particuliar question to ask ??
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Hi All !
I want to use maskedTextBox Control that the user only put date format in it ( in .NET 2005). for this in Mask Property , I selected ShortDate Format(0000/00/00). Now I want if the user typed "13" for month part or "32" for date , show an Error to the USER . how can I do it ?
thanks a lot .
Regards ,
s_mostafa_h
-- modified at 8:27 Thursday 6th April, 2006
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write a short validation function which will do that for you  . it's just a few lines of code...
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if it possible ... , give a little hint or ... ,
Yours ,
s_mostafa_h
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i'm at work now and i have only VC++ here  ... at home i'll write some snippet .
anyway, use a function that extracts day number/month number from that date format and then just validate those values... if there's no such function (i just don't remember), just take the value from text box and convert it to string, tokenize it using slashes, convert tokens into integers and you're there. that's my hint for now. if it doesn't help, i'll write some more later, or someone else helps you before .
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Try handling the Validating Event and use Datetime.Tryparse() to see if it is a valid date.
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hi,
but the problem is that the maskedTextBox format (datetime) based on JC(Julian calendar ) and its format is mm/dd/yyyy , but the format I want is yyyy/mm/dd based on Persian Calendar .
thanks for ur guide ,
s_mostafa_h
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Author: hema
hello,
i have developed an application thats a BHO.The setsite method of IObjectWithSite installs keyboard hooks. though the hook is getting installed, its not executing the expected work. i am attaching the code below. please tell me wats wrong in this.
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Web.Services;
using Microsoft.Win32;
using SHDocVw;
namespace KeyboardHooks_BHO
{
[ComVisible(true)]
[Guid("20C718C8-0D8C-42dc-B0CD-C7C53A23F116")]
public class BHO : IObjectWithSite
{
#region Member Variables
protected SHDocVw.IWebBrowser2 m_pIWebBrowser2;
protected SHDocVw.DWebBrowserEvents2_Event m_pDWebBrowserEvents2;
#endregion
#region Hook Variables
public struct KeyboardHookStruct
{
public long vkCode;
public long scanCode;
public int flags;
public long time;
public long dwExtraInfo;
};
private const int HC_ACTION = 0;
private const int LLKHF_EXTENDED = 0x01;
private const int LLKHF_ALTDOWN = 0x20;
private const long VK_T = 0x54;
private const long VK_P = 0x50;
private const long VK_S = 0x53;
private const int WH_KEYBOARD_LL=13;
protected IntPtr KeyboardHandle = IntPtr.Zero;
private static int mHook;
#endregion
public BHO()
{
MessageBox.Show("inside BHO's constructor");
}
#region COM interfaces
#region IObjectWithSite Members
public void SetSite(object newSite)
{
MessageBox.Show("inside SetSite");
object site=newSite;
string explorer= null;
if (m_pIWebBrowser2!=null)
Release();
if( site != null )
Marshal.ReleaseComObject( site );
site = newSite;
if( site != null )
{
MessageBox.Show("inside if site!=null");
IServiceProvider sp = site as IServiceProvider;
m_pIWebBrowser2 = site as SHDocVw.IWebBrowser2;
Guid guid = ExplorerGUIDs.IID_IWebBrowserApp;
Guid riid = ExplorerGUIDs.IID_IUnknown;
object wba;
sp.QueryService(ref guid,ref riid,out wba );
explorer=m_pIWebBrowser2.FullName.ToUpper();
if(explorer.EndsWith("IEXPLORE.EXE"))
{
MessageBox.Show("inside the IEXPLORE.EXE");
Install();
MessageBox.Show("hooking");
}
}
else
{
if ( explorer != null )
{
IServiceProvider sp = site as IServiceProvider;
m_pIWebBrowser2 = site as SHDocVw.IWebBrowser2;
Guid guid = ExplorerGUIDs.IID_IWebBrowserApp;
Guid riid = ExplorerGUIDs.IID_IUnknown;
object wba;
sp.QueryService(ref guid,ref riid,out wba );
explorer=m_pIWebBrowser2.FullName.ToUpper();
if(explorer.EndsWith("IEXPLORE.EXE"))
{
UnInstall();
MessageBox.Show("UnHookMe");
}
explorer = null;
}
MessageBox.Show("end of setsite");
return;
}
}
public int GetSite(ref Guid guid, out IntPtr ppvSite)
{
MessageBox.Show("inside getsite");
ppvSite = new IntPtr ();
return 0;
}
#endregion
protected void Release()
{
if (m_pDWebBrowserEvents2!=null)
{
Marshal.ReleaseComObject(m_pDWebBrowserEvents2);
m_pDWebBrowserEvents2=null;
}
if (m_pIWebBrowser2 != null)
{
Marshal.ReleaseComObject(m_pIWebBrowser2);
m_pIWebBrowser2 = null;
}
}
#endregion
#region Hook Functions
private delegate int KeyboardHookProcDelegate(int nCode, int wParam, int lParam);
public void Install()
{
MessageBox.Show("inside Install");
mHook=SetWindowsHookEx(WH_KEYBOARD_LL,new KeyboardHookProcDelegate(KeyboardHookProc),IntPtr.Zero,0);
if(mHook!=0)
{
MessageBox.Show("unable to install");
}
else
MessageBox.Show("Success in Installing!");
}
public static int KeyboardHookProc(int nCode, int wParam, int lParam)
{
KeyboardHookStruct HookStruct;
int ret = 0;
MessageBox.Show("inside HookProc");
HookStruct = (KeyboardHookStruct) Marshal.PtrToStructure(new IntPtr(lParam), typeof(KeyboardHookStruct));
long vkCode= HookStruct.vkCode;
int flag = HookStruct.flags;
if(nCode==HC_ACTION)
{
MessageBox.Show("inside nCode==HC_ACTION");
if(vkCode == VK_T )
{
if(flag==LLKHF_EXTENDED)
{
MessageBox.Show("Play");
ret=1;
}
else if((flag & LLKHF_ALTDOWN)!=0)
{
MessageBox.Show("Stop");
ret=1;
}
}
else if((vkCode == VK_P)&&((flag & LLKHF_EXTENDED)!=0))
{
MessageBox.Show("pause");
ret = 1 ;
}
else if((vkCode == VK_S) && ((flag & LLKHF_ALTDOWN)!=0))
{
MessageBox.Show("Save");
ret = 1 ;
}
}
if( ret == 0 )
{
ret = CallNextHookEx(mHook,nCode,wParam,lParam);
}
return ret;
}
public void UnInstall()
{
MessageBox.Show("inside UnInstall");
if(mHook!=0)
{
MessageBox.Show("inside mHook!=0 ");
UnhookWindowsHookEx(KeyboardHandle);
}
}
#endregion
#region Hook Win32Imports
[DllImport("user32.dll")]
private static extern int SetWindowsHookEx(int code,
KeyboardHookProcDelegate func,
IntPtr hInstance,
int threadID);
[DllImport("user32.dll")]
protected static extern int UnhookWindowsHookEx(IntPtr hhook);
[DllImport("user32.dll")]
protected static extern int CallNextHookEx(int hhook,
int code, int wParam, int lParam);
#endregion
}
}
My questions are:
1.why is the hooks not working?
2.is there any issues related to the virtual key values and extended flags?
3.the hook procedure is not getting called. Is the definition correct?
hoping this is clear.
thanks and regards,
hema
hema
-- modified at 0:51 Friday 7th April, 2006
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You're probably not going to get an answer since you
1. Didn't ask a specific question
2. Didn't post what specific problem was occurring.
3. Posted a huge code snippet without any formatting. (you should only post relevant, concise code snippets, surrounded with the <pre> tag)
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First, I'd try placing this code outside of a BHO, in a standard .NET Windows Forms application, so that you can verify that it's not Internet Explorer interfering.
Once you've done that, come back and tell us if it's still not working. There are several examples of installing hooks in C# on this website and around the web, so you should be able to get it working outside of the BHO.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: How 'bout a little guitar now?
The apostle Paul, modernly speaking: Epistles of Paul
Judah Himango
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I am googling around for a day, every site has method to deactivate screen saver, i dont want to deactivate screen saver i want to let it run and when my event triggers, i want to stop it from my program. my event is triggered by timer, so there is no interaction with keyboard or mouse. i did try this
SendMessage(GetDesktopWindow(),WM_SYSCOMMAND,SC_SCREENSAVE,1);
but it doesnt work.
Shajeel
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Shajeel wrote: i dont want to deactivate screen saver i want to let it run and when my event triggers, i want to stop it from my program.
Couldn't you be a little more clear about what you're trying to do? I don't understand when you say you want to deactivate the screen saver, yet you don't want to stop it.
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deactivating means to set either set screen saver to none from windows or from programming, this is easy and can be done by SendMessage from programming. whereas stopping means to stop screen saver from programming with out clicking a mouse or pressing keyboard.
Shajeel
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hello everybody in this forum.
Iam creating a usercontrol that runs as an embedded object inside the html code page in internet explorer that uses system.Net.Sockets to connect to a server i ran it on my localhost . It connects successfully , But after halt time . The explorer at first it hangs on for some seconds (lot of seconds) then it connects successfully.
Iam asking why the explorer doesn't respond during this time till it connects ? is there anyway for me to overcome this problem of halting the explorer?
I don't need it to halt ? i need it to work immediately.
Thanks everybody in this forum.
Any help will be greatly appreciated.
Human knowledge belongs to the world.
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Use a new thread to do the socket communication. If you're using the UI thread, it will lock up explorer while the connection is made. If you use a second thread, it shouldn't lock up explorer.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: How 'bout a little guitar now?
The apostle Paul, modernly speaking: Epistles of Paul
Judah Himango
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