Magic Numbers - File Header And Footer
Feb 12, 2011
For my project, I need to develop an app, which will have MS-SQL db with 4 tables
a>FileHeader
b>FileFooter
c>Extension
d>Detail about the file.
This is all to do with the Magic Numbers, or File header and footer, found in all files. The first 4-byte and last 4-bytes.
Example:
Suppose a word DOC file when read using this app should return and match the values
D0 CF 11 E0
So, how can I read the files using vb.net, fileIO, FileStream/StreamClass/FileReader? I just need to open the file and read the first 4 and last 4 bytes of any given file. And then it should connect back to the SQL database and lookup for the matching values from the tables as I had mentioned. And return a match found or not found.
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Apr 20, 2011
With all the smarts of actually loading images being done by the .net framework, seems like I shouldn't have to repeat it all in my code by checking for magic numbers, or using a hack like this:[code]Am I missing something obvious, like System.Drawing.IsImage(stream)?
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Oct 5, 2009
I need to make a difficult makro.When the makro has been activated (will happen via a button), it has to add a header and a footer to the document.Also page1/frontpage needs a different header and footer than all the other potential pages.So far, I have accomplished making page1/frontpage to work - somewhat.I did this by recording a makro, where I'd enable headers and footers, write the needed data and then stop recording.Afterwards I edited the coding so it would fit a little better. Mostly it was junk-code cleanup.
[Code]...
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Jun 25, 2009
I have a global header and footer that has a Database connection and a disconnection in the header and footer and need to convert this to ASP.NET - this needs to be done before any HTML is output and after any HTML is output for the footer.I cannot seem to find any easy way to do this, like in Classic ASP - if possible post an example or link to one instead of stating a given technique.
A bit more detail is that I have an SQL Connection string then a single SQL object I want to use throughout all the pages on the website - with the connection string and declarations in the header, and the disconnection in the footer.
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Oct 27, 2010
using asp.net/sqldatasource/vb
Is there a way to place the insert row below the header in a gridview instead of in the footer?
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Mar 9, 2009
I am using RDLC and i want to add dynamic text in header as well as in footer and some images in to the header but i cant understand how to add it in same rdlc. i can add static text in header as well as footer and when i add dynamic text in header it will be displayed in the first page only(after saving report in PDF format) but i cant get same text in next continuing pages
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May 28, 2012
I created a program with visual studio 2012. And I used skybound.gecko component that version is 1.9.0.1.When I print something everythings okay but i don't want the header and footer infos in the page.I want to remove header and footer when printing. how can i do that?
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Jun 2, 2009
I realise there is a solution for this but I am struggling to get it to convert to VB correctly.I have managed to get a cascading set of dropdowns with data based upon each others results which I was really pleased with.However due to the post back the grid will disappear until the second value is selected and looks awful.Is there anyway within VB to allow the header to stick around if there is no data within the grid view?
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Apr 4, 2011
I have an application which exports data from an Access 2007 database to an Excel 2007 worksheet automatically draws some graphs. I don't have any problems with generating the excel sheet and the graph, but i would like to also add the Date as a footer and a user name which will depend on a Login Form used to login to the application.
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Sep 2, 2011
I have htmltable which dynamically generated. I want to print this table. which consist lot of pages. when I used window.print() its printing into 7, 8 pages. but my problem is I need Header and footer on each page (A4 size). how can Set header and footer to each page.I am using asp.net with C#.I put header and footer on .aspx page but problem is that data is binding dynamic when I print then print goes multiple pages (ie 4 or 5 pages depend on data). So header come on first page and footer on last page I need header and footer on each page
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Jul 26, 2009
I am creating an application using VB 2005. I am using richtextbox control to get some text and do some text formating like bold, italics and font like stuff.
Now i want to save the richtext (formated) text to a word file with specific page margins, header and footer texts. And also to save the file with a supplied password.
I have tried the simplest method of rtf
[Code]...
I have spent hours to get my requirements to work. AS this is my first of this kind, i cannot firureout how to add header , footer, set margins and save file to specific location WITH password., Simply Need to know basic vb2005/vba options.
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Nov 29, 2010
I want to change the default context menu with my own.That will only have a print option, I don't need any of the others.How do I go about doing that?Also, how do I change the header/footer?
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Apr 26, 2010
How I can show header/footer of Asp.Net Gridview with empty data source?
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Apr 24, 2010
How do I reference the Header and Footer in a RichTextBox? And if I can't how do I access it in a file in RTF?
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Apr 16, 2009
i'm making a small word processor program using vb 2008 and i need the codes for the following commands: creating table adding and removing rows and columns header and footer
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Feb 26, 2012
"First of all please TURN OPTION STRICT ON.I make no apology for the capitals - I consider it that important.When you do you will see that you are still using HorizontalAlignment instead of ContentAlignment.VB is converting from one to the other for you.Although that works fine here there are many cases when it will not be what you intended and can cause some very hard to find bugs.Under Tools | Options | Projects and Solutions | VB Defaults Set: Option Strict ON, Option Explicit ON, Option Infer OFF".I did do this but it showed no errors, so I placed 'Option Strict On' at the start of the code, it then showed HorizontalAlignment with the squiggly line. I did edit my code to show this but I think you must have read it before I did. All other suggestions I will note and from now try to implement.Using "magic numbers" in the code is not good practice and makes maintenance difficult.Declare all such numbers at the top and use the names in the code.Is this what you mean? Const SpinTime As Integer = 500
Now when ever I refer in code to SpinTime it will always be 500..Change the NumberOfBoxes to 10 and run the app.In mine, to change boxes to 10 I needed to alter the code in 5 places, in yours 1 place! Talk about proof of the pudding etc.Now to my question, in the program when the start button is clicked and the five random numbers are displayed I have to stop and restart the program to generate five more. So I thought I would create another button 'Reset' this I did and all worked but it seemed a waste so I then just kept the start button in place and changed the text to Reset eg [code] This is fine the one thing I can't figure is how to replace the five numbers that were removed so that it is picking 5 from 500 every time. Now I'm at the end of all this writing I have it! just comment out the line 'Numbers.Remove(Number).
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Mar 9, 2012
I am trying to add page numbers to the footer of my report.
I want for it to appear as:
[Code].....
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Jul 9, 2009
unzipping file using GZipStream.Heres the solution but i hope that i don't need to imports another dlls [URL] the zip files i compressed with 7z. and here the code...
[Code]...
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Jan 26, 2012
This is my part of code for the grid view
<asp:GridView ID="gridViewCourse"
runat="server"
AutoGenerateColumns="False"
onrowcancelingedit="gridViewCourse_RowCancelingEdit"
onrowdeleting="gridViewCourse_RowDeleting" onrowediting="gridViewCourse_RowEditing"
onrowupdating="gridViewCourse_RowUpdating"
[Code]...
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Mar 11, 2010
A datagridview is sorting numerical values (when clicking the datagridview column header text) in the wrong order based on the initial digit:
[Code]....
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Feb 13, 2012
It seems that on clicking datagridview column header, the column will be automatically sorted based on the column type. I have a column showing some numbers. If column type is string, it sorts "1","20","3" into "1","20","3". If column type is double, it sorts into "1","3","20" which is the result that I want. However, there might be some erros in the numbers and error messages(text) will show in the cell instead of numbers. So I cannot set the column type as double. I want to ignore these error messages and sort all the numbers. How can I do this?
Also, I need to add some background colors to different rows in datagridview. So in the column header click event, I call the bkgColor Sub to achieve this. My question is that how can I override the sorting method in this event?
Private Sub DataGridView1_ColumnHeaderMouseClick(sender As Object, e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles DataGridView1.ColumnHeaderMouseClick
Try
[code]....
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Sep 24, 2009
Is there a way to access the field header name of a databound repeater within the header template. So insted of this....
<HeaderTemplate>
<table >
<th ></th>
<th >Forename</th>
[code]....
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Mar 11, 2011
I'm going through All-In-One Code Framework Coding Standards document and one of the recommendations is to add a file header comment at the start of every human-created code file. This is the first time I've seen such a recommendation and to me it's just an unnecessary and ugly clutter but I'm wondering if someone could explain why M$ recommends this?
[Code]...
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Oct 21, 2009
I'm using the following code to populate a DataGridView with a worksheet. This is working fine, however, I'm unsure how I can get the Text from the page header. (not to be confused with the column header). Later in my code when I am exporting into an existing workbook with a new worksheet, I'm wanting to use the header text as the tab name. The header text being "September 2009" so that when I import/manipulate/export october, the new tab will be "October 2009" etc. [Code]
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Oct 23, 2011
however, I am stuck at BinaryReader.actually this is what i am trying to acheive through VB.NET.say for the following file type :
JPG file = FF D8 FF E0
BMP file = 42 4D BE 4E
PNG file = 89 50 4E 47
GIF file = 47 49 46 38
the above are the 4-byte headers in Hex(raw) I need to read these headers of any given file using OpenFileDialog using Button1_click event,on selection of any given file(*.* filters ON)it should use the BinaryReader and look for only 4-bytes starting from offset 0, and it should not go to EOF marker (-1).and have a variable to hold this 4-byte header value, to run this in a database table which will check the same header value in the table and would display the corresponding extension of the file. from the table.
I can do this using case, if then...etc.however, I have to do it using Database and also i need to check for testing purpose to use MsgBox() to display this variable which is holding the 4-byte header.however, the MsgBox doesnt allow anything other than String.
PS: I tried studying the methods like:
FileOpen/Seek/Peek/ReadBytes().
but still not sure how to get them work.
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May 11, 2012
I save a lot of settings in an INI file as 1 (enabled) and 0 (disabled), all around the project's module i have this check If setting = 1 then ' do somethingEnd If ' OR If setting = 0 then ' do somethingEnd If
My question, is it good for performance to declare public constants to hold 1 & 0 and use them in such above checks instead of using real number?
In general, if i use value like 8, 9, "", "$", etc... in just two different places, should i declare constant for it?
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May 3, 2012
in my application i created table called houseloading which has field called housename.which is inserted into the sqlserver database. my table will look like this
///column name house
values red
green
what i want now is i want to display the values red green as column header in datagridview
which will look exactly like this
red green
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Nov 22, 2011
I should convert some code from VB to C#. Given following lines of VB work (I think only because option is not set to strict):
Dim someProp As SomeType
Try
someProp = CType(SomeInstance, Object).SomeProp
' ...
Due to late binding, this code is possible under VB. Of course, following won't work under C#:
SomeType someProp;
try
{
someProp = ((object)SomeInstance).SomeProp;
// ...
How could I formulate something similar under C#?
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Dec 27, 2009
What is the simplest way to use a C++ header file in a VB.NET application?I need to access an API defined via the header file for a custom VB.NET windows app.
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Mar 7, 2010
I use the Magic Mouse, it's fantastic in OSX but more so because of MagicPrefs which extends the multi-touch gestures its capable of. I'd like to know if its possible for me to write drivers for the Magic Mouse in VB? to extend it's functionality. Or would this be better suited for C++? I don't even know where to start.
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