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Hi,
I have a very strange problem which i hope someone can help shed light on.
I have a Windows Forms application which provides data-entry UI. Data
inputted is then stored into a DataSet which will be persisted into a XML
file using the WriteXML method.
The Dataset which contains a Filename data column (type = string); A user
selects a file using the OpenFileDialog component. The file name is
displayed in a textbox until the user clicks on the Save button.
PROBLEM:
If the file is selected using the OpenFileDialog.ShowDialog() method, the
file name is added to the dataset, but it is not written to the XML file.
However, if the filename is manually typed into the textbox, saving to XML
file succeeds.
This is a very strange problem, any help will be very much appreciated!
Thanks.
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I can guarantee that the problem is in your code and not the OpenFileDialog. It looks liek you're putting the filename into the TextBox, but your not updating the dataset with the new name.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi,
I'm trying to read the input of my IR Controller by raw input. I managed to get lParam (pointer) and some other variables out of it, and now I want to extract it to useable data.
I'm now able to make a difference between WM_INPUT of some other type, but there are like 10 keys on the remote using WM_INPUT. lParam seems the only parameter containing the info I need...
Thanks in advance.
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It sounds like you'll need to use some of the P/Invoke techniques. Look in the System.Runtime.InteropServices.Marshal class for some methods that you might need for handling the memory. Also, you will probably need to create a struct (marked with StructLayout(LayoutKind.Sequential)) that exactly matches the structure which your lParam is pointing to.
Read up on the P/Invoke stuff (Platform Invoke), and you'll probably fill in the important gaps in your understanding.
John
"You said a whole sentence with no words in it, and I understood you!" -- my wife as she cries about slowly becoming a geek.
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MSDN is your best friend in this case. According to MSDN, lparam is a "Handle to the RAWINPUT structure that contains the raw input from the device". Dig deeper here is the article on the structure: MSDN: RAWINPUT structure[^]
Alex Korchemniy
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Found a nice sample code: http://blogs.simplifi.com/brucet/downloads/remotecontrolsample.zip
It may help some others as well.
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Hi,
I have a System.Drawing.Bitmap of a screen capture that I want to convert to a byte array. Any ideas on how to do this? I expected the bitmap object to have some sort of ToArray method, but it hasn't.
I'm rather stumped.
TIA
Dr Herbie
Remember, half the people out there have below average IQs.
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You can save the image to a System.IO.MemoryStream, which does have the elusive ToArray method.
Charlie
if(!curlies){ return; }
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This should do the trick 
public static byte[] GenerateImageBytes(Bitmap bm)
{
byte[] bytes = null;
System.IO.MemoryStream ms = new System.IO.MemoryStream();
bm.Save(ms, ImageFormat.Gif);
bytes = ms.ToArray();
ms.Close();
return bytes;
}
Thomas
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Or, with slightly more pleasant syntax, with better resource management:
public static byte[] GenerateImageBytes(Bitmap bm)
{
using(MemoryStream ms = new MemoryStream())
{
bm.Save(ms, ImageFormat.Gif);
return ms.ToArray();
}
}
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Cops & Robbers
Judah Himango
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Yes, this looks greate
But, will the MemoryStream be closed (ms.Close())?
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That's what the using statement is for. The using clause automatically disposes of any IDisposable objects, including MemoryStream, thus it will call the appropriate close method when the scope leaves the using clause.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Cops & Robbers
Judah Himango
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Hi folks!
I'm being bugged by a very nasty problem and don't know how to proceed any further, perhaps someone can enlighten me.
In my programs I need an RSACryptoServiceProvider to encrypt and decrypt stuff. In order to check whether this is possible during startup, I simply try instantiating the CSP. If this blows, the user is told to install the latest service packs, IE5.5+ or anything that usually includes the strong encryption CSPs.
The code to do this is
CspParameters param = new CspParameters();
param.Flags = CspProviderFlags.UseMachineKeyStore;
RSACryptoServiceProvider csp = new RSACryptoServiceProvider(param); so I'm already using the Machine Key Store.
This throws an exception (CryptographicException: CryptoAPI cryptographic service provider (CSP) for this implementation could not be acquired), if the application was installed by an administrator on a Win2K SP4 machine and is then run by a user with restricted rights (belonging to group "Users").
When the admin is running the application, the code above executes flawlessly AND afterwards, the restricted user also can run the program!
I've been searching for this problem for quite some time and only found reports where this exception is thrown in an ASP.NET context, but my applications are Windows Forms applications, not ASP.NET ones.
I can't find which additional rights the user has to have for the code to work before the administrator has at least run it once.
Giving full access to C:\documents and settings\all users\application data\microsoft\crypto\* didn't help.
I'm completely at a loss on what to do next.
Can anyone help?
TIA,
mav
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You may try to set the RSACryptoServiceProvider.UseMachineKeyStore Property to false so that the key could be persisted in the user profile store instead of the computer's key store. Try if it can work while not defeating the purpose of your application.
Regards,
Ashok Dhamija
_____________________________
Padam Technologies
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Hi Ashok!
Thanks for your suggestion, but I had this configuration before switching to MachineKeyStore and it didn't work either.
Thanks nevertheless,
mav
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In one of my projects, I had used the following flag:
param.Flags = CspProviderFlags.UseDefaultKeyContainer;
instead of using the
param.Flags = CspProviderFlags.UseMachineKeyStore;
Thereafter, instead of storing the key in the Machine Key Store, I had hard-coded the key in my code. Of course, in the version released for outside world, I did not store my private key in the code. But, in a separate version meant for me only, I used the private key (which I used to pre-encrypt certain strings).
For storing the key in the hard-coded form, I used format like this (key not shown here):
string publicKeyXML = @" -------- ";
rsa.FromXmlString(publicKeyXML);
Thereafter, I could easily access the key for any user (whether administrator or otherwise).
I wonder whether a scheme like this could fit in your requirements.
Regards,
Ashok Dhamija
_____________________________
Padam Technologies
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Thanks again for your suggestion.
But meanwhile I found the reason: In addition to what the documentation says (users must have access to %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA to be able to create the MachineKeys directory), the very first time the additional directory MachineKeys has to be created in %SystemRoot%\System32\Microsoft\Crypto\RSA as well!
Once this directory exists, everything works as expected, but a regular user isn't allowed to modify System32 and because the CSP seems to be depending on the existence of the directory it rolls over and dies with a meaningless error message! 
I found this out with the help of RegMon and FileMon by Sysinternals, after running through hundreds (literally hundreds!) of file and registry access events.
Nevertheless, the problem seems to be solved.
Thanks for your support,
mav
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Hello all,
I am currently trying to convert a batch (CSC) compiled project into a VS 2003 solution, and I seem to be having a small problem with embedded resources.
This particular project uses the following batch arguments to compile (which works fine btw)
@echo off
if not exist lib md lib
if not exist doc md doc
if exist lib\Novell.Directory.Ldap.dll del lib\Novell.Directory.Ldap.dll
echo "Building resources..."
resgen Novell.Directory.Ldap\Novell.Directory.Ldap.UtilClass\ResultCodeMessages.txt lib\ResultCodeMessages.resources
resgen Novell.Directory.Ldap\Novell.Directory.Ldap.UtilClass\ExceptionMessages.txt lib\ExceptionMessages.resources
echo "Generating lib\Novell.Directory.Ldap.dll.."
csc /noconfig /w:1 /r:System.dll /target:library /resource:lib\ResultCodeMessages.resources
-> /resource:lib\ExceptionMessages.resources /doc:doc\comments.xml
-> /out:lib\Novell.Directory.Ldap.dll /recurse:Novell.Directory.Ldap\*.cs
del lib\ResultCodeMessages.resources
del lib\ExceptionMessages.resources
The problem I have is with the two resources generated above using the resgen tool. In my VS solution I have set both these files to be "embedded resources" but I get the following exception
{"Could not find any resources appropriate for the specified culture (or the neutral culture)
in the given assembly. Make sure \"ResultCodeMessages.resources\" was correctly embedded or
linked into assembly \"LibLdap\".\r\nbaseName: ResultCodeMessages locationInfo: <null>
resource file name: ResultCodeMessages.resources assembly: LibLdap, Version=2.1.3.0,
culture=neutral, PublicKeyToken=null" }
When the following code is executed:
defaultResultCodes = new ResourceManager("ResultCodeMessages", Assembly.GetExecutingAssembly());
result = defaultResultCodes.GetString(Convert.ToString(code), defaultLocale);
A similar exception occurs when attempting to access the other resource.
I know this is simply that the code cannot find the resource, can anybody tell me how to embed it correctly?
post.mode = postmodes.signature;
SELECT everything FROM everywhere WHERE something = something_else;
> 1 Row Returned
> 42
-- modified at 8:19 Thursday 8th September, 2005
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How to do it that include a exe file In a project? I have some method in a exe file.but I want to use them in another project.Can do ti? How to do it?
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hi there,
u cannot include an exe file as reference an dll. But u can reuse methods in exe file by executing it from ur application
<< >>
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In .NET, you can reference .exe files just like you do with .dll files.
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But you have to note that you can't add the reference with VS.NET, as only DLLs are selectable as assembly references.
But if you simply rename the EXE to DLL, it can be referenced without problems.
Regards,
mav
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Hi
I want to make a windows application conditional in following way:
If I start the application without parameters, then it should start as a windows application
If I start it with parameters, it should run as a console application.
Currently I solved it by creating a console application and check the input parameters. If no parameters are given, it starts a windows.forms class. This works perfectly - almost.
The problem is, that if it runs as a windows application, it starts also a dos box, which I would like to have prevented. Now the question is: How can I start the windows application conditional without the dos box?
Thanks Fredy
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One simple solution may be like this:
1. Make a skelton wrapper application (which should preferrably be a console application), which should have a very simple main method to call or execute the relevant application.
2. So, in the wrapper application's main method, check for parameters and start the windows application or the console application, as the case may be.
3. Immediately after the second step, the skelton wrapper application may exit.
Although there may be some better methods, but this simple solution may work too.
Regards,
Ashok Dhamija
_____________________________
Padam Technologies
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