C# Discussion Boards - CodeProject

Re: object to intialize and some function call question

20-Dec-11 10:19

Blubbo wrote:
Anyone have any thoughts?

Yes. A head full.

1. What you probably want is called an interface. Have all these MethodX classes implement a common interface which is a promise to implement whatever you like, such as a void SolveThis(ref int) method.

2. Please use PRE tags when posting code (or tabular data). It improved readability.

3. Your choice of names is horrible. A method is a method, a class is a class; don't define a class called MethodX. SolveThis is another poor choice, "this" has a special meaning in object-oriented languages such as C#.

4. Why is it your SolveThis method using a ref parameter, and apparently not using any return value?

5. If you're new to C# (or to programming in whatever language) I strongly recommend you choose, buy and study a book (a real book, one you own) and acquire good practices from day one; it is the easiest and fastest way to make real progress.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Blubbo21-Dec-11 2:30

Blubbo

21-Dec-11 2:30

1) I haven't used interface in my code before... the next responder by RobCroll has suggested a good solution for my question.

2) Yes, I am aware of PRE tags but apparently forgot to include that in my initial posting. My bad!

3) I was having hard time on what to say to give the reader the example without revealing important codes in my source (its work related).

4) I use int return value to provide the error code in case the function call failed to process. that's why I use ref parameter.

5) I am not new to C#. I have few books here and also online resources to help me out... I am still working on improving the efficiency of my codes.

Re: object to intialize and some function call question

Luc Pattyn21-Dec-11 2:55

Re: object to intialize and some function call question

21-Dec-11 2:55

Blubbo wrote:
I have few books here

Every book on C# is bound to discuss interfaces, so my best advice is to read one of those books you have from cover to cover and you will learn some of the basics you seem to be lacking right now. Browsing some on-line material is no substitute, it is a handy addition.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

RobCroll20-Dec-11 10:30

RobCroll

20-Dec-11 10:30

Create an interface get the other classes to implement that interface

interface ISolution
{
    int SolveThis(int question);
}

public class SolutionClass1 : ISolution
{
   ...

    public int SolveThis(int question)
    {
        //Do stuff

        return result;
    }
}

ISolution solution;
int method = 3;
int result;
 

switch (method)
{
   case 1: solution = new SolutionClass1; break;
   case 2: solution = new SolutionClass2; break;
   case 3: solution = new SolutionClass3; break;
   case 4: solution = new SolutionClass4; break;
   case 5: solution = new SolutionClass5; break;
}
 
result = solution.SolveThis(result);

"You get that on the big jobs."

Re: object to intialize and some function call question

Blubbo21-Dec-11 2:12

Blubbo

21-Dec-11 2:12

hmm... this might be the solution to my question. I'll give this a shot. Thanks!

Re: object to intialize and some function call question

SilimSayo20-Dec-11 15:06

SilimSayo

20-Dec-11 15:06

If the methods are different, then why not create one static class with several methods with different names or overloaded methods(assuming the signatures are different)?Do you have a particular need for naming all the methods the same in the different classes?

Re: object to intialize and some function call question

BillWoodruff21-Dec-11 18:21

BillWoodruff

21-Dec-11 18:21

Is this a case where you can assume that every Method you will call has the same signature, and returns the same type of result ?

If that's the case, there's an interesting solution, I'll post here.

best, Bill

When I consider the brief span of my life, swallowed up in the eternity before and after, the little space which I fill, and even can see, engulfed in the infinite immensity of spaces of which I am ignorant, and which knows me not, I am frightened, and am astonished at being here rather than there; for there is no reason why here rather than there, now rather than then.

Blaise Pascal

Problem withhalo effect using .MakeTransparent and .AntiAlias in GDI+ C#

jerute20-Dec-11 7:01

jerute

20-Dec-11 7:01

I have a user drawn form with rounded corners. I have set the .TransparencyKey of the form to the background color but when I set the SmoothingMode to .AntiAlias I get a halo effect on the corners when the form is displayed against a light background, as the background color is black. If I change the background color to SystemColors.Control I get the halo when the form is displayed against my dark desktop.

Is there a quick fix to this problem or do I have to (painfully) sample all of the colours used in the anti-alias effect and make them all transparent (if this is indeed possible) to get rid of this halo?

protected override void OnPaint(PaintEventArgs e)
{
	Graphics gr = e.Graphics;
	LinearGradientBrush GrBrush;
	GraphicsPath gPath;
	int w;
	int h;

	w = this.Width;
	h = this.Height;
	gr.SmoothingMode = SmoothingMode.HighQuality;

	GrBrush = new LinearGradientBrush(new Point(0, 0), new Point(0, 75), Color.FromArgb(255, 51, 51, 51), Color.FromArgb(255, 0, 0, 0));
	gPath = new GraphicsPath();
	gPath.AddArc(new Rectangle(0, 0, 15, 15), 180, 90);
	gPath.AddArc(new Rectangle(w-16, 0, 15, 15), 270, 90);
	gPath.AddLine(new Point(w-1, 75), new Point(0, 75));
	gPath.CloseAllFigures();
	gr.FillPath(GrBrush, gPath);
	gr.DrawPath(new Pen(GrBrush), gPath);

	GrBrush = new LinearGradientBrush(new Point(0, 14), new Point(0, h-1), Color.FromArgb(255, 1, 1, 1), Color.FromArgb(255, 0, 0, 80));
	gPath = new GraphicsPath();
	gPath.AddArc(new Rectangle(-10, 15, 400, 50), 180, 45);
	gPath.AddLine(new Point(w-1, 15), new Point(w-1, 75));
	gPath.AddArc(new Rectangle(w-16, h-21, 15, 15), 0, 90);
	gPath.AddArc(new Rectangle(0, h-21, 15, 15), 90, 90);
	gPath.CloseAllFigures();
	gr.FillPath(GrBrush, gPath);
	gr.DrawPath(new Pen(GrBrush), gPath);

	GrBrush = new LinearGradientBrush(new Point(5, 80), new Point(5, h-6), Color.FromArgb(255, 245, 245, 255), Color.FromArgb(255, 150, 150, 160));
	gPath = new GraphicsPath();
	gPath.StartFigure();
	gPath.AddArc(new Rectangle(5, 80, 10, 10), 180, 90);
	gPath.AddArc(new Rectangle(w-16, 80, 10, 10), 270, 90);
	gPath.AddArc(new Rectangle(w-16, h-21, 10, 10), 0, 90);
	gPath.AddArc(new Rectangle(5, h-21, 10, 10), 90, 90);
	gPath.CloseAllFigures();
	gr.FillPath(GrBrush, gPath);
	gr.DrawPath(new Pen(GrBrush), gPath);
}

Any help would be appreciated. Thx.

MarshalDirectiveException

korrea8020-Dec-11 4:13

korrea80

20-Dec-11 4:13

Hi all!.

I would like use unmanaged code from C in C#.

I built a DLL with C code with this functions:

<pre lang="c++">
struct GetPluginData
{
 int data[22];
};

DLLEXPORT extern "C" __declspec (dllexport) GetPluginData GetDataArray(int number);

In C# I've got this code:

[StructLayoutAttribute(LayoutKind.Sequential, Pack=1)]
        public unsafe struct GetPluginData
        {
            /// int[22]
            [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 22, ArraySubType = UnmanagedType.I4)]
            public int[] data;
        }

[DllImport("RBRPlugin.dll", CallingConvention = CallingConvention.StdCall, EntryPoint = "GetDataArray")]
        [return: MarshalAs(UnmanagedType.Struct)]
        public static extern GetPluginData GetDataArray(int number);

In button event or othe place code, I wrote this:

GetPluginData tes = GetDataArray(1);

And I'm getting the error: The type signature of this method is not PInvoke compatible.

I'm looking for information throught google, but no result found...

Thanks in advance!

Re: MarshalDirectiveException

Richard Andrew x6420-Dec-11 6:39

Richard Andrew x64

20-Dec-11 6:39

There is another way you can marshal the return type from that function.

First, declare the return type from the C function to be a pointer to the GetPluginData structure instead of the structure itself.

Declare the return type as an IntPtr in C#, and then use the functions in the Marshal class to read the structure from unmanaged memory into a managed structure.

The difficult we do right away...
...the impossible takes slightly longer.

Re: MarshalDirectiveException

korrea8021-Dec-11 0:48

korrea80

21-Dec-11 0:48

Hi!

Thanks for the info Richard. The solution was write for Hans Passans in StackOverflow:

[DllImport("RBRPlugin.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "GetDataArray")]
public static extern GetPluginData GetDataArray(int number);

[StructLayoutAttribute(LayoutKind.Sequential)]
public struct GetPluginData
{
    public unsafe fixed int data[22];
}

public GetPluginData temp1 = new GetPluginData();

private void button1_Click(object sender, EventArgs e)
{
    GetPluginData test = GetDataArray(1);
    temp1 = test;
    unsafe
    {
        fixed (GetPluginData* p = &temp1)
        {
            p->data[0] = 1;
        }
    }
}

Like you read, the principal problem was the array in GetPluginData struct, it must be fixed.

Thaks!

XML Serialization

rk288120-Dec-11 2:42

rk2881

20-Dec-11 2:42

Hi,
i am developing WCF application using MVC3.
I m using xmlserialization to serialize data.
Here is the sample code:

namespace A{
[serializable]
[DataContract(Name="User")]
[XmlAttribute("User")]
Public class User {

[DataMember(Name="ID"]
[XmlAttribute("ID"),IsRequired=false]
public void ID {get; set;}

[DataMember(Name="ID"]
[XmlAttribute("IDSpecified"),IsRequired=false]
public void IDSpecified{get; set;}

}
}

Now i am assigning values to this properties and trying to serialize xml.
User.ID=1;
User.IDSpecified=2;

It is giving error because property names are starting with same string "ID". If i change "Specified" instead of "IDSpecified" then it is serialize fine because property name is different.

So is there any rule that property name should not start wth same characters

Pls help me ASAP.

Thank you.

modified 20-Dec-11 8:49am.

Subin Mavunkal20-Dec-11 4:39

Subin Mavunkal

20-Dec-11 4:39

Why cant you use

[DataMember(Name="ID"]
[XmlAttribute("ID"),IsRequired=false]
public void ID {get; set;}

[DataMember(Name="SpecifiedID"]
[XmlAttribute("SpecifiedID"),IsRequired=false]
public void SpecifiedID{get; set;}

instead of

[DataMember(Name="ID"] ***
[XmlAttribute("ID"),IsRequired=false]
public void ID {get; set;}

[DataMember(Name="ID"] ***
[XmlAttribute("IDSpecified"),IsRequired=false]
public void IDSpecified{get; set;}

Is it permitted to use same Id for two different data members ?

rk288120-Dec-11 19:35

rk2881

20-Dec-11 19:35

hI,

Sorry for the mistake in question. Datamember names are different only.

[DataMember(Name="ID"]
[XmlAttribute("ID"),IsRequired=false]
public void ID {get; set;}

[DataMember(Name="SpecifiedID"]
[XmlAttribute("SpecifiedID"),IsRequired=false]
public void SpecifiedID{get; set;}

Still i m getting same error.

Eddy Vluggen20-Dec-11 6:30

Eddy Vluggen

20-Dec-11 6:30

rk2881 wrote:
It is giving error because property names are starting with same string "ID".

I bet that it's due to the datamember; it's no problem to have identifiers that start with the same prefix.

rk2881 wrote:
Pls help me ASAP.

We're volunteers, and your question is just as important as all the others here.

Bastard Programmer from Hell Suspicious | :suss:

SledgeHammer0120-Dec-11 6:37

SledgeHammer01

20-Dec-11 6:37

Did you notice that you have duplicate DataMember names? Thats not allowed. Also, how do you have get/set on a void method?

DatagridView Adds Extra Empty Row

rk288120-Dec-11 19:54

rk2881

20-Dec-11 19:54

Thanks for the reply.

I found the solution. Here is the link:
http://msdn.microsoft.com/en-us/library/system.xml.serialization.xmlserializer.aspx

AmbiguousName20-Dec-11 1:07

AmbiguousName

20-Dec-11 1:07

hello guys... i have this datagridview inwhich I add some data using DataTable. Now If I add more than one rows in my grid, it adds two empty rows at the bottom while it should add just one. Here is the code

private void CellDblClick(object sender, DataGridViewCellEventArgs e)
{
    int colPartNum = 1;
    string colPartDetails = "Keyboard";
    int colQty = 5;
    double colPartCost = 15;

    //This is just a DataTable declared at the TOP
    AllItemsDT.Rows.Add(colPartNum, colPartDetails, colQty, colPartCost); 

    AddRowsToGrid(AllItemsDT);
}

private void AddRowsToGrid(DataTable dt)
{
  dgItemDetails.AutoGenerateColumns = false;
  dgItemDetails.Columns[0].DataPropertyName = dt.Columns[0].ColumnName;
  dgItemDetails.Columns[1].DataPropertyName = dt.Columns[1].ColumnName;
  dgItemDetails.Columns[2].DataPropertyName = dt.Columns[2].ColumnName;
  dgItemDetails.DataSource = dt;
  dgItemDetails.Rows[0].Selected = true;
}

So why it is adding two empty rows at the bottom if I add more than one rows, while it should add just one? thnx

Re: DatagridView Adds Extra Empty Row

PIEBALDconsult20-Dec-11 4:27

PIEBALDconsult

20-Dec-11 4:27

You may need to call AllItemsDT.AcceptChanges()

And I'm unsure you need most of what's in AddRowsToGrid

app working in window Xp but not in window 7

Hum Dum19-Dec-11 22:44

Hum Dum

19-Dec-11 22:44

It's 32 bit Window application using kernel32.dll for serial port communication.
(I know about System.IO.Ports.SerialPort class existence, but application run fine in XP.)

In window 7 its not working as expected.
I disabled UAC, run as administrator. This started application but some function are not executing properly.

Like for GSM modem interface,
Modem response for AT command is OK, but in window 7 its not responding for app.

But if i use hyper-terminal in win7, its responding for AT.

What needs to be done to able to run the app?
I tried Google before posting here, but not much help.

I think, its kernel32.dll which the app unable to access or window 7 is restricting some function/feature of it?
Can any one please guide/help me?

regards

OriginalGriff19-Dec-11 23:03

OriginalGriff

19-Dec-11 23:03

Windows 7 is a lot stricter about hardware access than XP, and this is probably your problem. Have you tried running your app in Compatibility Mode?[^]

Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water

Hum Dum19-Dec-11 23:37

Hum Dum

19-Dec-11 23:37

yes i tried that also.

but application not working as excepted. After compatibility mode setting, application able to read and write on serial port but unable to access modem status (GSM modem status, its capturing in XP like ring, busy etc).

[DllImport("kernel32.dll")]
public static extern Boolean GetCommModemStatus(IntPtr hFile, out UInt32 lpModemStat);

Also for GSM if i use ATZ command its responding, but not for AT.

It has to be with security, access control setting.

any other idea.

regards

Luc Pattyn20-Dec-11 7:03

20-Dec-11 7:03

Having code execute well on one operating system does not imply the code is correct or good enough.

When inexplicable things happen, that tells me you are ignoring success/failure results somewhere. Make sure you look at every return value for system calls (such as the ones you're calling in kernel32.dll), call GetLastError correctly when such a function signals an error, and do not swallow exceptions, always report something is wrong, with the necessary details.

And be careful how you handle GetLastError, as the P/Invoke layer interferes with it; I explained it in here[^].

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Hum Dum8-Jan-12 22:43

Hum Dum

8-Jan-12 22:43

WRT to you link, i tried but no luck.
then i replace hardware card/modem with another one.

And on this everything worked as excepted, without any code modification.
But same old card is working on XP, also responding to hyper-terminal in win 7.

Then i tried SerialPort class of .Net framework 2.0 wrt to this Article and old modem/card responded as excepted in win 7.

I am using this article for PI invoke.

My question is why its not working in win 7 with PI invoke code.
but responding with SerialPort class of .Net 2.0, also to hyper-terminal.
Old modem is PCI card, while new is PCI express.
Any light/idea you shed highly appreciated.

below are query modem log of both old(not working) and new(working)
Not Working Query Modem log

01-06-2012 20:48:20.029 - File: C:\Windows\system32\tapisrv.dll, Version 6.1.7600   
01-06-2012 20:48:20.045 - File: C:\Windows\system32\unimdm.tsp, Version 6.1.7600   
01-06-2012 20:48:20.045 - File: C:\Windows\system32\unimdmat.dll, Version 6.1.7600   
01-06-2012 20:48:20.045 - File: C:\Windows\system32\uniplat.dll, Version 6.1.7600   
01-06-2012 20:48:20.060 - File: C:\Windows\system32\drivers\modem.sys, Version 6.1.7600   
01-06-2012 20:48:20.060 - File: C:\Windows\system32\modemui.dll, Version 6.1.7600   
01-06-2012 20:48:20.060 - File: C:\Windows\system32\mdminst.dll, Version 6.1.7600   
01-06-2012 20:48:20.060 - Modem type: Conexant 56K Voice Modem
01-06-2012 20:48:20.060 - Modem inf path: oem15.inf
01-06-2012 20:48:20.060 - Modem inf section: Modem1
01-06-2012 20:48:20.060 - Matching hardware ID: pci\ven_2003&dev_8800&subsys_280016ef
01-06-2012 20:48:20.060 - Opening the modem device failed with error 00000020
ATQ0V1E0 - OK
AT+GMM - Conexant 56K Voice Modem
       Ver4.20.01AG11
AT+FCLASS=? - 0,1,2.0,8
AT#CLS=? - 0,1,2.0,8
AT+GCI? - +GCI:B5
AT+GCI=? - +GCI:(B5)
ATI1 - Conexant 56K Voice Modem
       Conexant
       Ver4.20.01AG11
       Rev
ATI2 - Conexant 
       Ver4.20.01AG11
       Rev
       MV (CID\SPK)
ATI3 - Conexant
       SL8800 PCI
ATI4 - Active Profile:
       S00=000 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002 S07=060
       S08=002 S09=006 S10=128 S11=100 S12=050 S13=000 S14=000 S15=001
       S16=001 S17=000 S18=000 S19=000 S20=000 S21=000 S22=000 S23=000
       S24=050 S25=000 S26=000 S27=008 S28=000 S29=001 S30=002 S31=001
       S32=092 S33=009 S34=034 S35=000 S36=000 S37=001 S38=000 S39=002
       S40=000 S41=000 S42=000 S43=000 S44=000 S45=250 S46=017 S47=000
       S48=000 S49=000 S50=000 S51=000 S52=000 S53=000 S54=000 S55=000
       S56=004 S57=000 S58=000 S59=000 S60=001 S61=000 S62=001 S63=000
       S64=000 S65=000 S66=000 S67=000 S68=000 S69=000 S70=000 S71=000
       S72=019 S73=003 S74=153 S75=000 S76=004 S77=001 S78=000 S79=070
       S80=070 S81=000 S82=002 S83=055 S84=000 S85=000 S86=000 S87=000
       S88=001 
ATI5 - Stored Profile 0:
       Not defined
ATI6 - Stored Profile 1:
       Not defined
ATI7 - Country: USA
       Serial Number: 0
       Protocol Factor: 0

Working Query Modem log

ATQ0V1E0 - OK
AT+GMM - +GMM: PCIe CX95610 Soft Modem
AT+FCLASS=? - 0,1
AT#CLS=? - COMMAND NOT SUPPORTED
AT+GCI? - +GCI: 53
AT+GCI=? - +GCI: (00,01,02,03,04,05,06,07,09,0A,0B,0C,0D,0E,0F,10,11,12,13,14,15,16,19,1A,1B,1C,1D,1E,1F,20,21,22,
23,24,25,26,27,28,29,2A,2B,2C,2D,2E,2F,30,31,32,33,34,35,36,37,38,39,3A,3B,3C,3D,3E,40,41,42,43,44,45,46,47,48,49,
4B,4C,4D,4E,4F,50,51,52,53,54,55,56,57,58,59,5A,5B,5C,5E,5F,60,61,62,63,64,65,66,67,68,69,6A,6B,6C,6D,6E,6F,70,71,
72,73,74,75,76,77,78,79,7A,7B,7C,7D,7E,7F,80,81,82,83,84,85,86,87,88,89,8A,8B,8C,8D,8E,8F,90,92,93,94,96,97,98,99,
9A,9B,9C,9D,9E,9F,A0,A1,A2,A3,A4,A5,A6,A7,A8,A9,AA,AB,AC,AD,AE,AF,B0,B1,B2,B3,B4,B5,B6,B7,B8,B9,BA,BB,BC,BD,BE,BF,
C1,C2,C3,C4,C5,C7,C8,C9,CA,CB,CC,CD,CE,CF,D0,D1,D2,D3,D4,D5,D6,D7,D8,D9,DA,DB,DC,DD,DE,DF,E0,E1,E2,E3,E4,E5,E6,E7,
E8,EA,EB,EC,ED,EE,EF,F0,F1,F2,F3,F4,F5,F7,F8,F9,FA,FB,FC,FE)
ATI1 - 255
ATI2 - OK
ATI3 - HSF_V7.80.2.51
ATI4 - PCIe CX95610 Soft Modem
ATI5 - 083
ATI6 - SoftK56 
       CModem Version 12
       Rksample Version 342
ATI7 - 255
ATQ0V1E0 - OK
AT+GMM - +GMM: PCIe CX95610 Soft Modem
AT+FCLASS=? - 0,1
AT#CLS=? - COMMAND NOT SUPPORTED
AT+GCI? - +GCI: 53
AT+GCI=? - +GCI: (00,01,02,03,04,05,06,07,09,0A,0B,0C,0D,0E,0F,10,11,12,13,14,15,16,19,1A,1B,1C,1D,1E,1F,20,21,22,
23,24,25,26,27,28,29,2A,2B,2C,2D,2E,2F,30,31,32,33,34,35,36,37,38,39,3A,3B,3C,3D,3E,40,41,42,43,44,45,46,47,48,49,
4B,4C,4D,4E,4F,50,51,52,53,54,55,56,57,58,59,5A,5B,5C,5E,5F,60,61,62,63,64,65,66,67,68,69,6A,6B,6C,6D,6E,6F,70,71,
72,73,74,75,76,77,78,79,7A,7B,7C,7D,7E,7F,80,81,82,83,84,85,86,87,88,89,8A,8B,8C,8D,8E,8F,90,92,93,94,96,97,98,99,
9A,9B,9C,9D,9E,9F,A0,A1,A2,A3,A4,A5,A6,A7,A8,A9,AA,AB,AC,AD,AE,AF,B0,B1,B2,B3,B4,B5,B6,B7,B8,B9,BA,BB,BC,BD,BE,BF,
C1,C2,C3,C4,C5,C7,C8,C9,CA,CB,CC,CD,CE,CF,D0,D1,D2,D3,D4,D5,D6,D7,D8,D9,DA,DB,DC,DD,DE,DF,E0,E1,E2,E3,E4,E5,E6,E7,
E8,EA,EB,EC,ED,EE,EF,F0,F1,F2,F3,F4,F5,F7,F8,F9,FA,FB,FC,FE)
ATI1 - 255
ATI2 - OK
ATI3 - HSF_V7.80.2.51
ATI4 - PCIe CX95610 Soft Modem
ATI5 - 083
ATI6 - SoftK56 
       CModem Version 12
       Rksample Version 342
ATI7 - 255

Luc Pattyn9-Jan-12 5:17