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hello everyone..
i have a little problem with loading wmf file (wmf is richtext format)
if loads from file everithing works
Dim i As Image = Image.FromFile("c:\1.wmf")
but if loads from memory array nothing happen
Dim s1 As New MemoryStream()
Dim a() As Byte
Dim i As Image
a = My.Computer.FileSystem.ReadAllBytes("c:\1.wmf")
s1.Write(a, 0, a.Length)
i = Image.FromStream(s1, True, True)
if i switch file to bmp or jpg everythings fine
please help
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Hi,
a stream has some kind of pointer inside of it, telling it where the next
read or write is going to happen. Where do you think it points after
you did s1.Write(a, 0, a.Length) ? Read up on MemoryStream to find the cure !
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
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thank you.. everything is OK now
but i dont understand why jpg works fine?!
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Spejlo wrote: but i dont understand why jpg works fine?!
with exactly the same code ???
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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yes.. only file change to jpg
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Hi,
MSDN on Image.FromStream() states: The stream is reset to zero if this method is
called successively with the same stream.
I did test this on a stream containing two JPEG; and later two GIF; it always
reads the first image twice, i.e. I can't read the second image !!
I don't have WMF in stock.
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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A WMF is not an image, it's vector information. The Metafile class is what he needs to use.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Hi Christian,
I was not aware of the Metafile class, but it seems to inherit from Image.
And Wmf is just one of the ImageFormat members. So I would expect it to behave
like Jpeg and Gif as far as FromFile and FromStream go, but that is not what
the original poster was saying.
I'll try with some WMF files soon.
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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So, I'd expect an Image instance can be a Metafile, but you probably need to call the Metafile constructor, or FromFile method, to load a metafile.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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To load an image, set the PictureBox's Image property to a new Bitmap object initialized by the image file's name.
' Load a file.
Private Sub mnuFileOpen_Click(ByVal sender As _
System.Object, ByVal e As System.EventArgs) Handles _
mnuFileOpen.Click
If dlgOpen.ShowDialog() = DialogResult.OK Then
picImage.Image = New Bitmap(dlgOpen.FileName)
Me.Width = picImage.Width + Me.Width - _
Me.ClientSize.Width
Me.Height = picImage.Height + Me.Height - _
Me.ClientSize.Height
Dim file_name As String = dlgOpen.FileName
file_name = _
file_name.Substring(file_name.LastIndexOf("\") _
+ 1)
Me.Text = "[" & file_name & "]"
dlgSave.FileName = dlgOpen.FileName
End If
End Sub
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modified on Wednesday, May 6, 2009 6:16 AM
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Hi John,
The OP has a problem with Image.FromStream not being consistent, and not conforming
to its documentation.
We all know how to read an image file and how to display it, that was not the issue.
BTW: some of us don't like a PictureBox much.
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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A windows metafile is not a raster image, I'd be surprised that you could load it into an Image object. It contains vector information, not a picture.
http://msdn2.microsoft.com/en-us/library/wb42xhfh.aspx[^] shows how to work with a metafile.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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I have been experimenting with the following C# code:
ADDED
remark: the wmf files are derived from the gif files (with Image.FromFile
and Image.Save); the jpg files are unrelated.
/ADDED
public void test() {
testImageStream("image1.gif", "image2.gif");
testImageStream("image1.jpg", "image2.jpg");
testImageStream("image1.wmf", "image2.wmf");
}
public void testImageStream(string file1, string file2) {
log(new string('-', 80));
log("First create one stream containing two images");
MemoryStream ms=new MemoryStream();
byte[] bytes1=File.ReadAllBytes(file1);
int len1=bytes1.Length;
log("file1="+file1+", len="+len1+", size="+Image.FromFile(file1).Size);
ms.Write(bytes1, 0, len1);
byte[] bytes2=File.ReadAllBytes(file2);
int len2=bytes2.Length;
log("file2="+file2+", len="+len2+", size="+Image.FromFile(file2).Size);
ms.Write(bytes2, 0, len2);
try {
log("trying without rewind, should fail");
Image img1=Image.FromStream(ms);
log(" img1="+img1.Size);
} catch(Exception exc) {
log(exc);
}
try {
log("with explicit positioning");
ms.Seek(0, SeekOrigin.Begin);
Image img1=Image.FromStream(ms);
ms.Seek(len1, SeekOrigin.Begin);
Image img2=Image.FromStream(ms);
log(" img1="+img1.Size+" img2="+img2.Size);
} catch(Exception exc) {
log(exc);
}
try {
log("with only one rewind");
ms.Seek(0, SeekOrigin.Begin);
Image img1=Image.FromStream(ms);
Image img2=Image.FromStream(ms);
log(" img1="+img1.Size+" img2="+img2.Size);
} catch(Exception exc) {
log(exc);
}
}
and this is the output it generates on VS2005 or .NET 2.0:
23:46:13.437 --------------------------------------------------------------------------------
23:46:13.453 First create one stream containing two images
23:46:13.468 file1=image1.gif, len=4315, size={Width=64, Height=131}
23:46:13.468 file2=image2.gif, len=1525, size={Width=40, Height=40}
23:46:13.484 trying without rewind, should fail
23:46:13.500 img1={Width=64, Height=131}
23:46:13.515 with explicit positioning
23:46:13.515 img1={Width=64, Height=131} img2={Width=64, Height=131}
23:46:13.531 with only one rewind
23:46:13.625 img1={Width=64, Height=131} img2={Width=64, Height=131}
23:46:13.640 --------------------------------------------------------------------------------
23:46:13.656 First create one stream containing two images
23:46:13.656 file1=image1.jpg, len=7766, size={Width=143, Height=176}
23:46:13.796 file2=image2.jpg, len=148762, size={Width=632, Height=868}
23:46:13.812 trying without rewind, should fail
23:46:13.828 img1={Width=143, Height=176}
23:46:13.843 with explicit positioning
23:46:13.843 img1={Width=143, Height=176} img2={Width=143, Height=176}
23:46:13.859 with only one rewind
23:46:13.875 img1={Width=143, Height=176} img2={Width=143, Height=176}
23:46:13.984 --------------------------------------------------------------------------------
23:46:14.000 First create one stream containing two images
23:46:14.015 file1=image1.wmf, len=4283, size={Width=64, Height=131}
23:46:14.031 file2=image2.wmf, len=1591, size={Width=40, Height=40}
23:46:14.125 trying without rewind, should fail
23:46:14.140 img1={Width=64, Height=131}
23:46:14.156 with explicit positioning
23:46:14.156 img1={Width=64, Height=131} img2={Width=64, Height=131}
23:46:14.359 with only one rewind
23:46:14.375 img1={Width=64, Height=131} img2={Width=64, Height=131}
so my conclusions are:
1. all image types tested behave identically
2. they all always rewind the stream, which is not how I understand the
documentation "The stream is reset to zero if this method is called successively
with the same stream."
It really seems to be "The stream is reset to zero then read".
3. I fail to see how your original post matches with my test.
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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here is my code. comments inside.
http://lamernet.no-ip.com:45173/bordel/wmf.zip
-- modified at 3:57 Sunday 19th August, 2007
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Hi,
looked at your code, it is basically the same as mine.
ran your code, it gives "paramter is not valid" (and OK with rewind).
tried my code with ,true,true added to my FromStreams: no change
Tried my code with your WMF file: no change
googled some on FromStream bug, found many
conclusions:
- same as before
- plus: there seem to be some bugs, so play it safe, do explicit rewind!
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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Mine query is I have two data bases db1 and db2. db1 contains one table name country and db2 contains one table contact.
in db1.contact table it has one field country_code and same in db2.country table country_code.
can you give me the solution for it,I want to show country name. but in contact table only it has country_code.
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I Added a TextBox Column and Then a ComboBox at The Right Side of That Column to My DataGridView 2.0
The Problem is That The CellValueChanged Event Does Not Raise For ComboBox Cells.
WHAT SHOULD I DO?
Thanks
A.E.K
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Hi
i have small pieces of rtf data (gathered using RichText controls). now i want to combine this all data into a word document. assigning numbers to all every piece of rtf data.
Can anybody let me know the way to it. i am very new to office automation
Salman Sheikh
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Have you looked at using the Office Interop classes?
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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thanx dear. it will definately work but the scenario is a bit problematic
I have a form on which a richtextbox is placed user inputs the data and save it into database. hundreds of records have been saved in this way. now i have to combine these all into a single document. (for each record user is free to use fonts, colors and other rtf formating). now when i joined them all the richtextbox displayed only one record.
now i removed the closing bracket from every record instead of last. it worked but all text is now in black color. i dont know how to preserve the colors in concatenated rtf
Salman Sheikh
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Dear Salman Sheikh,
Try using IO.Stream and get the whole document ni a stream, do what ever you want in the stream and save it as rtf.
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Dear friends,
I wish to add file path what I get on execution of each for loop with the help of code in it. I wish to add those path (one path at one time) to some kind of array which can store strings and after the whole execution, I want to process the array.
But not able to find any insert method on string arrray or array, it's there with arraylist but not able to put string in its items.
thanks,
Jwalant Soneji (BE IT)
Mobile: +91 9969059127
http://jnsoneji.spaces.live.com
http://jnsoneji.blogspot.com
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you can use an ArrayList or a List<string> to hold strings.
myArrayList.Add(myString)
and
string myString=(string)myArrayList[myIndex]
or
foreach(string str in myArrayList) (doh, that's C# syntax !)
-- modified at 6:51 Saturday 18th August, 2007
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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Luc Pattyn wrote: myArrayList.Add(myString);
i get error on this.... as its a string and not an object.
Jwalant Soneji (BE IT)
Mobile: +91 9969059127
http://jnsoneji.spaces.live.com
http://jnsoneji.blogspot.com
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