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who can help me reading the header of an avi-file from my C# application?
i want to get some informations like width, height rate/sec. etc.
do i have to use unmanaged code and call API functions?
i am a beginner so maybe someone could send me sample code
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I tried to find or create a c# component to create a query by drag and drop tables and fields (something like Access Query design). Any idea, please help me.
regards.
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There's one in VS.NET....other than that Im not sure.
Who is this miscrosoft, and what devilish plans have they for us?
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www.devcity.com where working on one a while back! Don't know whats happened to it though!
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I tried to integrate a flex program with C# the way I used to integrate with VB6 but nothing is happening.
I want to know the correct way to do it. Is there any DLLs I have to attach?
Pls help me.
Thanks.
kind rgds,
Anjana Aluthwala
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I'm new in working with exe files so i wanna know..
How i can get the size of the header of an exe file. or read data from it.
i read about exe file format and i knew that header size is stored @ 08H. is that true?
if it's true then i tried to read the 8th byte but it contains zero!!
if not then what's true.
thanks 4 All
plextoR
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If you're refering to the PE/COFF header, a lot more is typically involved. Take a look at Shell Extensions for .NET Assemblies[^]. I read the header to accomplish something else but a simple branch in code would get you what you want. There's also an article in MSDN Magazine (you can see it online from MSDN[^]) that contains more in-depth analysis of the header. Either should be a good place to start.
"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons
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Thanks Alot but sorry i can't understand what do you mean with PE/COFF  . As i told you i'm new with this operations.
i'll read the article .. thanks alot
plextoR
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If you're going to work with executable headers (which aren't just .exe's BTW), you have to know what PE/COFF headers are. The Common Object File Format actually started back on VAX/VMS. Microsoft modified it with a Portable Executable header which contains a sort of bootstrapper that is actually a small DOS executable (yes, even in NT). The PE header is just a bunch of structures with pointers to other structures and a lot of flags. For instance, the difference in the headers for a .exe and a .dll is a single bit.
You can find a couple really great articles about reading PE/COFF headers written by Matt Pietrek for MSDN Magazine at the following locations:
Inside Windows: An In-Depth Look into the Win32 Portable Executable File Format[^]
Inside Windows: An In-Depth Look into the Win32 Portable Executable File Format, Part 2[^]
You may be interested in a utility he wrote called DUMPBIN. Microsoft distributes it with developers studios, so it's probably already on your system.
"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons
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Hi,
I am writing a program with a database ( xxxx.mdb), and the data set is displayed on a DataGrid.
I've implemented an Add function to add new record and it's ok.
But I can't delete an existing record. The following code is what I've used.
this.BindingContext[dbProductSet1, "Products"].RemoveAt(this.BindingContext[dbProductSet1, "Products"].Position);
It runs ok, but the record can't be deleted. And, when I later execute:
oleDbDataAdapter1.Update(dbProductSet1);
An error occurs saying: "Update requires a valid DeleteCommand when passed DataRow collection with deleted rows."
Afterward, I added this line and tried again:
dbProductSet1.Products.AcceptChanges();
The error message is gone and it seems ok, but in fact the "deleted" record isn't deleted!!
Can anyone please give me comments?? Thank you!!!
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Once you do DataSet.AcceptChanges() or DataTable.AcceptChanges(), a DataAdapter no longer sees your changes and therefore doesn't call the required command. DataAdapter() uses DataSet or DataTable.GetChanges() to get a DataSet or DataTable with just the changes and it knows (based on state) which rows have been deleted, inserted, or updated. So, as the error states, you need to assign an OleDbCommand to the DeleteCommand property of the OleDbDataAdapter. That way, when it runs across a record that has been marked for deletion, it'll call the appropriate SQL statement to delete the record.
"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons
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how can i hide the console in my exe program until i call apon it too be opened (in this case a -console commandline paremeter)
jesse m
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Just shooting from the hip here.
If there isn't any solution buried in the MSDN docs, or some bizarre method lurking on some System object, why not make your program a WinForm that hosts your program and mimics a console instead. That would give you a *much* higher degree of control than you would need (room to grow even).
If you absolutely need to use the Console.Readline/Writeline for i/o, I suppose you could try "hijacking" the streams already supplied by the class for display. The Console class supplies methods for opening and setting the Input/Output streams and TextReaders (respectively).
.. anyway, give it a shot, and good luck. 
- Eric
Calling a function is like tying your shoe. Remoting a function is like tying someone else's shoe... while they're running around... in China.
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yeah i think ill just make my own kinda console on a seperate class / dll (ill have more room to grow and do other stuff with it like you said..besides games like tfc definitly dont use a standard C++ console lol)
thanks alot eric for the info..
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How do you cast the object ? I keep getting the error "Can't implicitly cast ..."
ResultClass 1Result = new ResultClass()<br />
<br />
IEnumerate resultsEnum;<br />
resultsEnum = Results.GetEnumerator();<br />
<br />
while(resultsEnum.moveNext()){<br />
1Result = (ResultClass)resultsEnum.Current<br />
<br />
}<br />
I have a class full of results (Lets call it results) and each index contains a result object(or 1 result).
Problem is when I enumerate the class "results" I can't cast into the 1Result class .. Anyone ?
Ex.
By the way the references are COM objects and the 1Result is a variant.
Thks in advance !!!
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First you can't / shouldn't start variables with a number. Second, GetEnumerator() returns an IEnumerator, not IEnumerate. That's why it can't cast. Your last line of code is correct.
"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons
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I am facing some difficulties with the licensing scheme in .NET.
I have created a solution with 2 projects:
- a licensed windows form .NET control (written in C#)
- a small application hosting the control (written in VB)
Currently, I just try a basic licensing using the .NET LicFileLicenseProvider.
I am quite sure to have written the code as indicated in the .NET doc.
However it does not work. The license exception is raised except is the license file is placed in the application exe directory. It seems that no license key has been embed in the .exe.
Does anybody has faced such a problem? How to solve it? (I use .NET v1)
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yes i had the same problem first.
but i think it will be solved if you simply compile your control first (in a separate solution)
then open your host app .
add the control to the toolbox , and place it on a form in the host app.
(your license file should be located in the same dir as the .dll)
now vs.net should generate a "licenses.licx" in your host app..
(you will only see this if you show all files in the project explorer)
if you open the "licenses.licx" it should contain something like:
"MyControlProject.MyControl is a licensed component"
and the "licenses.licx" should be an "embeded resource".
if all this apply , your licensing should work...
//Roger
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Thanks very much.
I have followed your advices and have finally been able to solve my problem!
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Something else to think about:
Since you are licensing your controls I assume that you probably
want to keep people from recreating your "source" code via the .NET
disassemblers/decompilers that are already out there.
For a scary example of one see: http://remotesoft.com/salamander/index.html
(You can test their disassembler on your own code on this site)
This tool will recreate your original source code minus some comments.
I have a question: Has anybody found a way (e.g., a build flag)
to make decompiling of .NET assemblies more difficult besides paying
a $1K for an MSIL obfuscator?
TonyJ
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I have purchased an obfuscator (from Preemptive Solutions).
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I'm hoping not to pay twice for something:
#1, Pay MS so I can COMPILE programs/libraries
#2, Pay someother company so $$ so someone else can't DECOMPILE
the code I COMPILED
Thanks anyhow. I'll take a look at the company if I can't find a
free alternative.
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Ok, here's the deal - I have two assemblies in a project along with a tester application. The tester application is dependant on (and references) both assemblies, but neither of the assemblies reference each other. I have set up the dependancies and references for the tester app in VS.NET (including setting the references to the assemblies to copy the referenced assemblies local). When i launch the tester application, i get a IO SystemException saying that one of the dll's or its dependancies can't be found, yet if i open explorer and look in the bin\debug folder, i can see both of the assembly dll's along with the tester executable.
Any help? This is very frustrating.
Thanks!
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the_grip wrote:
When i launch the tester application, i get a IO SystemException saying that one of the dll's or its dependancies can't be found, yet if i open explorer and look in the bin\debug folder, i can see both of the assembly dll's along with the tester executable.
One or both of the assemblies probably has a dependancy on another assembly that is not in the progrm directory or the GAC.
Who is this miscrosoft, and what devilish plans have they for us?
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That's what i initially thought, however, they only reference the base assemblies (System, etc.). There are no custom references defined that these are dependant on. Surely I don't have to copy these dlls... that should be in the environment path... or do i need to set these to copy local?
i should note that i had this problem once before... i had to strong name my assemblies and add them to the GAC before it would work. This was a few weeks ago, and i dumped that solution. Every time i rebuilt the assemblies i would have to reregister them in the GAC. Surely there is a better solution (i can't imagine having to do this just to test assemblies)?
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