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[C# HELP] Sendmessage FAIL.

 
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Fuzz
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PostPosted: Fri Jul 25, 2008 2:55 pm    Post subject: [C# HELP] Sendmessage FAIL. Reply with quote
Ok, well, sendmessage isnt working. I get like 2 errors, which i cannot fix. So maybe someone here can help.

Here's my SendMessage code:

Code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;


namespace WindowsFormsApplication1
{
     
             
[DllImport("user32.dll")]
public static extern int FindWindow(
string lpClassName, // class name
string lpWindowName // window name
);
   
[DllImport("user32.dll")]
public static extern int SendMessage(
        int hWnd, // handle to destination window
        uint Msg, // message
        int wParam, // first message parameter
        int lParam // second message parameter
);
        }


Now, my problem, is, it underlines "int" before FindWindow, and after Extern, sane with SendMessage. It highlights "int" and says:

Expected class, delegate, enum, interface, or struct.
I get that twice.
And i also get Another error twice:
The modifier 'extern' is not valid for this item

Anyone had this problem and solved, or can someone help -.-. Thanks.

Last edited by Fuzz on Fri Jul 25, 2008 10:48 pm; edited 1 time in total
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oib111
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PostPosted: Fri Jul 25, 2008 3:15 pm    Post subject: Reply with quote
Well first off it returns LRESULT not int, and second of its HWND hWnd, not int hWnd.
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samuri25404
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PostPosted: Fri Jul 25, 2008 3:53 pm    Post subject: Reply with quote
First, you should use the .NET variant of FindWindow() (use Process.GetProcessesByName() with the process name as the parameter, then get the hWnd from the property similar to that (I can't remember the exact name)).

I don't know if this is your problem, but it's probably going to show up later on.

Change the decl to this:

Code:

[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr SendMessage(
    IntPtr hWnd,
    uint Msg,
    IntPtr wParam,
    IntPtr lParam);


After you call the method, for debugging, you should do something like

Code:

//... after call...
int Error = Marshal.GetLastWin32Error();
if (Error != 0)
{
    MessageBox.Show ("There was an error calling the method!, error code " + Error.ToString());
    return;
}


The error code will be a number, and you can look that up on the internet (or if you have professional Visual Studio, Tools -> Error Lookup).

~~

Maybe add

Code:

using System.Interop.RuntimeServices;


to the top of your code?
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Fuzz
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PostPosted: Fri Jul 25, 2008 5:34 pm    Post subject: Reply with quote
I'll give it a shot, thanks samuri.

EDIT:

Still errors. Here's SS:


If you cant see: Code:
Code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Interop.RuntimeServices;


namespace WindowsFormsApplication1
{

[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr SendMessage(
    IntPtr hWnd,
    uint Msg,
    IntPtr wParam,
    IntPtr lParam);
        }


That code is in a class. Class1.cs is that the right spot for it?
Also, errors:
Code:
Error   1   The modifier 'extern' is not valid for this item   C:\Documents and Settings\Administrator\Local Settings\Application Data\Temporary Projects\WindowsFormsApplication1\Class1.cs   11   25   WindowsFormsApplication1

Code:
Error   1   The modifier 'extern' is not valid for this item   C:\Documents and Settings\Administrator\Local Settings\Application Data\Temporary Projects\WindowsFormsApplication1\Class1.cs   11   25   WindowsFormsApplication1



Error 3 Expected class, delegate, enum, interface, or struct C:\Documents and Settings\Administrator\Local Settings\Application Data\Temporary Projects\WindowsFormsApplication1\Class1.cs 12 22 WindowsFormsApplication1
Code:
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Odecey
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PostPosted: Sat Jul 26, 2008 7:05 pm    Post subject: Reply with quote
Uhm, isnt this
samuri25404 wrote:

Maybe add

Code:

using System.Interop.RuntimeServices;


to the top of your code?

supposed to be
Code:

using System.Runtime.InteropServices;
?
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AngelSl
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PostPosted: Sun Jul 27, 2008 8:10 am    Post subject: Reply with quote
I can't believe you guys didn't notice this.

Code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Interop.RuntimeServices;


namespace WindowsFormsApplication1 // Namespace, OK
{

class Main
{
[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr SendMessage( // Cannot have a function in namespace - must be in CLASS
    IntPtr hWnd,
    uint Msg,
    IntPtr wParam,
    IntPtr lParam);
        }
}

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Symbol
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PostPosted: Sun Jul 27, 2008 8:27 am    Post subject: Reply with quote
It's not "System.Interop.RuntimeServices", like Odecey said, it's "System.Runtime.InteropServices".
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samuri25404
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PostPosted: Tue Jul 29, 2008 12:11 pm    Post subject: Reply with quote
Symbol wrote:
It's not "System.Interop.RuntimeServices", like Odecey said, it's "System.Runtime.InteropServices".


Right, my bad, really rusty.

Edit:

AngelSl wrote:
I can't believe you guys didn't notice this.

Code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Interop.RuntimeServices;


namespace WindowsFormsApplication1 // Namespace, OK
{

class Main
{
[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr SendMessage( // Cannot have a function in namespace - must be in CLASS
    IntPtr hWnd,
    uint Msg,
    IntPtr wParam,
    IntPtr lParam);
        }
}


I noticed it in the picture, I was just scanning the code
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