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Hi everybody
I´m trying to do my own Custom Control, and I followed this helpfull tutorial
Writing your Custom Control: step by step[^]
But I have a problem, I can´t see the properties that I have created.
This is my code
Imports System.Windows.Forms
Imports System.Drawing
Imports System.ComponentModel
Imports Microsoft.VisualBasic.PowerPacks
Public Class ClaseTarjeta
Inherits RectangleShape
Private Bit As Boolean
'<Browsable(True)>
<Description("Estado del Bit")>
<Category("BITS")>
Public Property EstadoBit() As Boolean
Get
Return Bit
End Get
Set(ByVal Value As Boolean)
Bit = Value
End Set
End Property
Sub New()
End Sub
And I have in the user control that
Imports ClassTarjeta
Public Class Tarjeta
Dim bit_0 As ClaseTarjeta
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
If bit_0.EstadoBit = False Then
rBit0.FillColor = Drawing.Color.Gray
Else
rBit0.FillColor = Drawing.Color.Green
End If
End Sub
Private Sub Tarjeta_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Timer1.Enabled = False
Timer1.Interval = 500
End Sub
End Class
any help will be gratefull, because I don´t know what I have made wrong
Sorry for my poor english 
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Why do you have two classes and what's with the timer? This stuff doesn't make a lot of sense as written.
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You are right!!! Sorry. I´m writing again...
Edit:
Solved, I have made only one Class, and now works!!!
modified 8-Feb-14 10:34am.
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Hello
I need a Help on toolstrip
I have to add 1000 button contol in toolstrip. the button are added successfully but if control (item) are over flow in toolstip then the some of the control are not visible. they get hide
So I request to give some help
Thanks
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Adding 1000 buttons to a tool strip is just plain stupid. There is no good reason to do that. As a user, I wouldn't want to go through that list of buttons.
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hi in web application I have saved one bitmap image to serverpath and once again if i try to save another image with the same name to the same server path i am getting follwing error
'System.Runtime.InteropServices.ExternalException' occurred in System.Drawing.dll but was not handled in user code
Additional information: A generic error occurred in GDI+.
and also if i try to delete that image file with the same path using below code
if (System.IO.File.Exists(serpath))
{
System.IO.File.Delete(serpath);
}
it is giving The process cannot access the file serpath because it is being used by another process.
How to resolve this.i need to overwrite the image with the same name and to the same location and also delete.
how to resolve this.
if anybody knows,Please Reply me. thanks in advance.
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I have tried like this copying to new bitmap then disposing old bitmap and then saving new bitmap using below code
if (System.IO.File.Exists(serpath))
{
System.Drawing.Image myimage1;
myimage1 = System.Drawing.Image.FromFile(serpath);
System.Drawing.Bitmap source_bitmap = new System.Drawing.Bitmap(myimage1);
myimage1.Dispose();
int thumb_width = 400, thumb_height = 100;
System.Drawing.Bitmap thumb_bitmap = new System.Drawing.Bitmap(thumb_width, thumb_height);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(thumb_bitmap);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.FillRectangle(System.Drawing.Brushes.White, 0, 0, thumb_width, thumb_height);
g.DrawImage(source_bitmap, 0, 0, thumb_width, thumb_height);
g.Dispose();
System.Drawing.Imaging.ImageCodecInfo[] Info = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();
System.Drawing.Imaging.EncoderParameters Params = new System.Drawing.Imaging.EncoderParameters(1);
Params.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
thumb_bitmap.Save(serpath, Info[1], Params);
}
else
{
signatureImage.Save(serpath, ImageFormat.Jpeg);
}
but then also it is giving error 'System.Runtime.InteropServices.ExternalException' occurred in System.Drawing.dll but was not handled in user code Additional information: A generic error occurred in GDI+ and not able to delete that file also.
how to do this. Please reply me, thanks in advance.
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Now for your issue. Give this a try. I rewrote the logic to get the JPEG encoder assuming that is the one you wanted. If not, it is easy to change and understand now. There should really be some handling in there in the unlikely event that the encoder does not exist. But you can add that easily enough.
if (System.IO.File.Exists(serpath))
{
System.Drawing.Image myimage1 = System.Drawing.Image.FromFile(serpath);
int thumb_width = 400, thumb_height = 100;
using (System.Drawing.Bitmap thumb_bitmap = new System.Drawing.Bitmap(thumb_width, thumb_height))
{
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(thumb_bitmap))
{
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.Clear(Color.White);
g.DrawImage(myimage1, 0, 0, thumb_width, thumb_height);
}
myimage1.Dispose();
System.Drawing.Imaging.ImageCodecInfo jpeg = default(System.Drawing.Imaging.ImageCodecInfo);
jpeg = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders().
Where((System.Drawing.Imaging.ImageCodecInfo enc) =>
enc.FormatID == System.Drawing.Imaging.ImageFormat.Jpeg.Guid)
.FirstOrDefault();
System.Drawing.Imaging.EncoderParameters Params = new System.Drawing.Imaging.EncoderParameters(1);
Params.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
thumb_bitmap.Save(serpath, jpeg, Params);
}
}
else
{
signatureImage.Save(serpath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
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Actually using this code the blank image is coming. Using my previous code only i am getting updated image to the same location with the same name. Only problem is after sending mail with this image iinked to the html and after html mail delivery, i am not able to again save new updated image with same name and to the same location.
How to resolve this. Please reply me. Thanks in advance.
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hello
Please share us complete details i.e how you are displaying an images on site.
as this is due to image object is not getting null after rendring images and it is till in use at server.
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Hello guys i have a problem. i have a datagridview with textboxes. i insert-update-delete records from database. Everything works fine. when i click on a cell in the grid. the information about this person are populated into the textboxes. but when i click on the newly inserted record it won't display the informations into texboxes. here is my code. What could the problem be?
Private Sub DataGridView1_RowEnter(sender As Object, e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.RowEnter
Try
If e.RowIndex < 0 Then Exit Sub
txtserial.Text = DataGridView1.Rows(e.RowIndex).Cells(0).Value
lblcustomer.Text = "Member: " & DataGridView1.Rows(e.RowIndex).Cells("Name").Value & " " & DataGridView1.Rows(e.RowIndex).Cells("familyName").Value
Dim cmd As SqlCommand
Dim myDA As SqlDataAdapter
Dim myDataSet As DataSet
Dim strsql As String
Dim i As Integer = 0
strsql = "select * from membersvw where serial = " & Val(txtserial.Text)
cmd = New SqlCommand(strsql, mcon)
If mcon.State = ConnectionState.Closed Then mcon.Open()
myDA = New SqlDataAdapter(cmd)
myDataSet = New DataSet()
myDA.Fill(myDataSet, "membersvw")
If myDataSet.Tables("membersvw").Rows.Count > 0 Then
txtserial.Text = myDataSet.Tables("membersvw").Rows(0).Item("serial").ToString
txtname.Text = myDataSet.Tables("membersvw").Rows(0).Item("name").ToString
txtfamilyname.Text = myDataSet.Tables("membersvw").Rows(0).Item("familyname").ToString
txtphone.Text = myDataSet.Tables("membersvw").Rows(0).Item("phone").ToString
txtmobile.Text = myDataSet.Tables("membersvw").Rows(0).Item("mobile").ToString
txtfax.Text = myDataSet.Tables("membersvw").Rows(0).Item("fax").ToString
txtemail.Text = myDataSet.Tables("membersvw").Rows(0).Item("email").ToString
txtwebsite.Text = myDataSet.Tables("membersvw").Rows(0).Item("website").ToString
txtaddress.Text = myDataSet.Tables("membersvw").Rows(0).Item("address").ToString
txtspace.Text = myDataSet.Tables("membersvw").Rows(0).Item("space").ToString
cmbtimezone.Text = myDataSet.Tables("membersvw").Rows(0).Item("timezonename").ToString
End If
If TabControl1.SelectedTab.Name = "TabPage2" Then
clearcars()
fillcargrid()
ElseIf TabControl1.SelectedTab.Name = "TabPage3" Then
clearpayments()
fillpaymentgrid()
End If
myDA.Dispose()
myDataSet.Dispose()
mcon.Close()
Catch ex As Exception
MsgBox(ex.ToString)
End Try
End Sub
Thank you for your help.
modified 7-Feb-14 7:28am.
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Did you update the database with your modified DataSet, before clicking the row that might be in your clients local cache, but not yet on the server?
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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Hello ,
I was using a windows project developed in vb.net2003 with crystal report 9. Earlier every thing was running fine now i decided to upgrade it to vb.net2010(framework 4.0) . i convert/ upgraded the project using vs2010 after conversion every thing is running fine but i started giving me error as follows :-
""""DLL 'C:\WINDOWS\assembly\GAC\CrystalDecisions.CrystalReports.Engine\9.1.5000.0__692fbea5521e1304\CrystalDecisions.CrystalReports.Engine.dll' is attempting managed execution inside OS Loader lock. Do not attempt to run managed code inside a DllMain or image initialization function since doing so can cause the application to hang.". Please help i will like to tell you that my users for this application varies from win98 to win 7 so i think keeping crystal report 9 is mandatory.
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hi
I am using json signature and trying deserialize but i am not able to deserialize. below is my json string
{"lines":[[[156.44,96.44],[156.44,95.33],[155.33,94.22],[154.22,93.11],[154.22,90.89],[153.11,89.78],[150.89,87.56],[150.89,84.22],[148.67,83.11],[147.56,80.89],[146.44,78.67],[144.22,76.44],[142,74.22],[139.78,70.89],[136.44,67.56],[134.22,65.33],[130.89,63.11],[128.67,60.89],[126.44,59.78],[124.22,57.56],[123.11,57.56],[122,56.44],[118.67,56.44],[116.44,56.44],[114.22,56.44],[112,56.44],[108.67,56.44],[105.33,56.44],[99.78,56.44],[96.44,57.56],[93.11,59.78],[89.78,60.89],[87.56,62],[86.44,64.22],[84.22,66.44],[83.11,67.56],[80.89,69.78],[79.78,70.89],[78.67,74.22],[77.56,75.33],[77.56,77.56],[77.56,79.78],[77.56,82],[77.56,84.22],[77.56,86.44],[77.56,88.67],[78.67,90.89],[78.67,93.11],[80.89,95.33],[82,97.56],[85.33,98.67],[87.56,99.78],[89.78,102],[93.11,102],[96.44,104.22],[100.89,105.33],[107.56,107.56],[114.22,108.67],[120.89,109.78],[125.33,110.89],[130.89,110.89],[134.22,112],[137.56,113.11],[139.78,114.22],[142,115.33],[143.11,115.33],[144.22,116.44],[145.33,116.44],[147.56,117.56],[147.56,118.67],[148.67,119.78],[149.78,122],[150.89,122],[150.89,124.22],[150.89,126.44],[150.89,127.56],[150.89,129.78],[150.89,132],[150.89,134.22],[149.78,135.33],[148.67,137.56],[147.56,139.78],[145.33,142],[144.22,144.22],[143.11,145.33],[139.78,146.44],[137.56,147.56],[135.33,147.56],[133.11,147.56],[129.78,147.56],[126.44,148.67],[124.22,148.67],[120.89,148.67],[118.67,148.67],[114.22,148.67],[109.78,148.67],[105.33,148.67],[102,148.67],[99.78,148.67],[97.56,148.67],[94.22,148.67],[92,148.67],[88.67,148.67],[86.44,148.67],[84.22,148.67],[83.11,148.67],[82,148.67],[79.78,148.67],[79.78,147.56],[77.56,147.56],[76.44,146.44],[75.33,146.44],[75.33,146.44],[75.33,146.44],[75.33,145.33],[74.22,145.33],[74.22,143.11],[73.11,140.89],[70.89,138.67],[70.89,137.56],[69.78,135.33],[69.78,135.33],[69.78,135.33],[69.78,133.11],[69.78,133.11],[69.78,133.11],[69.78,133.11],[69.78,132]]]}
i used code like below to deserialize
public Bitmap SigJsonToImage(string json)
{
var signatureImage = GetBlankCanvas();
if (!string.IsNullOrEmpty(json))
{
using (var signatureGraphic = Graphics.FromImage(signatureImage))
{
signatureGraphic.SmoothingMode = SmoothingMode.AntiAlias;
var pen = new Pen(PenColor, PenWidth);
var serializer = new JavaScriptSerializer();
var lines = serializer.Deserialize<list<signatureline>>(json);
foreach (var line in lines)
{
signatureGraphic.DrawLine(pen, line.lx, line.ly, line.mx, line.my);
}
}
}
return signatureImage;
}
here i am getting lines count 0 and it is not coming inside codesignatureGraphic.DrawLine
private class SignatureLine
{
public int lx { get; set; }
public int ly { get; set; }
public int mx { get; set; }
public int my { get; set; }
}
private Bitmap GetBlankCanvas()
{
var blankImage = new Bitmap(CanvasWidth, CanvasHeight);
blankImage.MakeTransparent();
using (var signatureGraphic = Graphics.FromImage(blankImage))
{
signatureGraphic.Clear(BackgroundColor);
}
return blankImage;
}
how to achieve this. anybody knows please reply me.
thanks in advance
modified 5-Feb-14 4:35am.
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The JSON you're trying to deserialize doesn't match the structure of the class you're trying to deserialize it to.
You can deserialize it to the following class:
private class Signature
{
public List<List<List<double>>> lines { get; set; }
}
var signature = serializer.Deserialize<Signature>(json);
This will give you a single object with a single property called lines. This property is a list containing a single element. That element is a list containing a sequence of lists, each of which contains a pair of numbers.
{
lines: [
[
[156.44, 96.44],
[156.44, 95.33],
[155.33, 94.22],
[154.22, 93.11],
[154.22, 90.89],
[153.11, 89.78],
...
]
]
}
How you map that data to your expected list of SignatureLine objects is unclear, since you haven't provided an example of how you expect to get four integers from two floating point numbers.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thank you very much for replying. How you said like that i got one object with a single property called lines. Now i need to implement by taking into forloop but i am not able to. below is the code.
foreach (var line in signature)
{
signatureGraphic.DrawLine(pen, line.lx, line.ly, line.mx, line.my);
}
to get into for loop we have to add below code or not please specify
private class SignatureLine
{
public int lx { get; set; }
public int ly { get; set; }
public int mx { get; set; }
public int my { get; set; }
}
after this it will return
return signatureImage;
again it will come to default page as shown in below code as a bitmap
var signatureImage = sigToImg.SigJsonToImage(json);
then this signatureImage is system.drawing.bitmap and i need to save as image as follows
Bitmap bmp = new Bitmap(signatureImage);
bmp.Save(Server.MapPath("images\\s1.jpg"), ImageFormat.Jpeg);
bmp.Dispose();
but i am not able to get into for loop.
How to achieve this. Please reply me.
Thanks in advance
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Nope, that still doesn't make any sense to me. Your list contains pairs of floating point numbers; how do you intend to get four integer values from that?
For example, the first value in your list is: [156.44, 96.44]
Given those two numbers, what values are you expecting in the lx, ly, mx and my properties of the SignatureLine class?
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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I dont know i got code while searching, i think we are at end stage and can we change so that it has to work by changing signatureGraphic.DrawLine parameter
signatureGraphic.SmoothingMode = SmoothingMode.AntiAlias;
foreach (var lines in signature)
{
signatureGraphic.DrawLine(pen, lines.lx, line.ly, line.mx, line.my);
}
so that signatureGraphic can draw line.
Please reply.
thanks in advance
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You still haven't explained how you are expecting to get four integers out of each pair of floating-point numbers. Without that information, it is impossible to convert your source data to a series of calls to the DrawLine method.
If you don't know what the data means, then you can't do anything with it!
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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actually that is (lx, ly) is the start point of the line, and (mx, my) is the end point of the line.
i think that it is clear. but i dont know how to achieve this. Reply me thanks in advance
modified 5-Feb-14 13:31pm.
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OK, that makes more sense. There's still the slight issue that the JSON is using floating-point numbers but the DrawLine method expects integers, but you can probably ignore that for now.
You'll still need to deserialize to the class I posted previously, but you can use an iterator method to construct the sequence of SignatureLine objects from the data:
private sealed class SignatureLine
{
public int lx { get; set; }
public int ly { get; set; }
public int mx { get; set; }
public int my { get; set; }
}
private class Signature
{
public List<List<List<double>>> lines { get; set; }
public IEnumerable<SignatureLine> SignatureLines
{
get
{
foreach (List<List<double>> stroke in lines)
{
if (stroke.Count == 1) continue;
List<double> lastPoint = stroke[0];
Debug.Assert(lastPoint.Count == 2);
foreach (List<double> point in stroke.Skip(1))
{
Debug.Assert(point.Count == 2);
yield return new SignatureLine
{
lx = (int)Math.Round(lastPoint[0]),
ly = (int)Math.Round(lastPoint[1]),
mx = (int)Math.Round(point[0]),
my = (int)Math.Round(point[1])
};
lastPoint = point;
}
}
}
}
}
...
var serializer = new JavaScriptSerializer();
var signature = serializer.Deserialize<Signature>(json);
foreach (SignatureLine line in signature.SignatureLines)
{
signatureGraphic.DrawLine(pen, line.lx, line.ly, line.mx, line.my);
}
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Now it is looping inside and also values are getting
public Bitmap SigJsonToImage(string json)
{
var signatureImage = GetBlankCanvas();
if (!string.IsNullOrEmpty(json))
{
using (var signatureGraphic = Graphics.FromImage(signatureImage))
{
signatureGraphic.SmoothingMode = SmoothingMode.AntiAlias;
var pen = new Pen(PenColor, PenWidth);
var serializer = new JavaScriptSerializer();
var signature = serializer.Deserialize<signature>(json);
foreach (SignatureLine line in signature.SignatureLines)
{
signatureGraphic.DrawLine(pen, line.lx, line.ly, line.mx, line.my);
}
}
}
return signatureImage;
}
private Bitmap GetBlankCanvas()
{
var blankImage = new Bitmap(CanvasWidth, CanvasHeight);
blankImage.MakeTransparent();
using (var signatureGraphic = Graphics.FromImage(blankImage))
{
signatureGraphic.Clear(BackgroundColor);
}
return blankImage;
}
private sealed class SignatureLine
{
public int lx { get; set; }
public int ly { get; set; }
public int mx { get; set; }
public int my { get; set; }
}
private class Signature
{
public List<list<list<double>>> lines { get; set; }
public IEnumerable<signatureline> SignatureLines
{
get
{
foreach (List<list<double>> stroke in lines)
{
if (stroke.Count == 1) continue;
List<double> lastPoint = stroke[0];
Debug.Assert(lastPoint.Count == 2);
foreach (List<double> point in stroke.Skip(1))
{
Debug.Assert(point.Count == 2);
// For now, just round the floating point values to the nearest integer:
yield return new SignatureLine
{
lx = (int)Math.Round(lastPoint[0]),
ly = (int)Math.Round(lastPoint[1]),
mx = (int)Math.Round(point[0]),
my = (int)Math.Round(point[1])
};
lastPoint = point;
}
}
}
}
}
now after returning return signatureImage; to default page, am i doing correctly to save as image because i am getting blank image the code used is as follows
var signatureImage = sigToImg.SigJsonToImage(json);
Bitmap bmp = new Bitmap(signatureImage);
bmp.Save(Server.MapPath("images\\s1.jpg"), ImageFormat.Jpeg);
bmp.Dispose();
i am getting blank image. how to achieve this. Reply me thanks in advance
modified 6-Feb-14 1:50am.
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Since the signatureImage is already a Bitmap, I'm not sure why you're creating a new Bitmap to save it; you should be able to use:
signatureImage.Save(Server.MapPath("~/images/s1.jpg"), ImageFormat.Jpeg);
Other than that, there's no obvious problem with the code that's saving the image. You'll need to step through your code to check that you're getting the values out of the JSON, that the pen you're using has a suitable colour and width, and that the lines you're drawing are within the bounds of the picture.
The last point is particularly important; if all the lines you're drawing are outside the bounds of the picture, then you won't be able to see them.
I've just run your code to a 200 x 200 pixel canvas, using a 1 pixel black pen on a white background, and I get an image with a hand-drawn "S" on it.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
modified 6-Feb-14 7:48am.
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