Re: sending arguments to "Save As" Dialog box - C# Discussion Boards

10-Nov-10 4:31

Hello,

I have some executable code which sends a message to some process, this message opens a "save as" dialog. (regular window's dialog)
The question is how can also pass arguments (a path to save in) to the launched dialog ?

Do i need to use my application API, or there is some other way to do it by using windows messages

Thanks

musefan10-Nov-10 5:56

10-Nov-10 5:56

There is something confusing about your question but I will provide what I think is an answer.

Are you using a SaveFileDialog ? As this has a property called InitialDirectory which you can set to be the path to save the file in...

SaveFileDialog sfd = new SaveFileDialog();
sfd.InitialDirectory = @"C:\my_folders\folder_to_save_in\";
if(sfd.ShowDialog() == DialogResult.OK){
   //Do something with sfd.FileName
}

I don't think you can force the user to save in that folder only but there are a couple of options if you need that functionality?

Life goes very fast. Tomorrow, today is already yesterday.

Richard MacCutchan10-Nov-10 6:19

10-Nov-10 6:19

Depending on the message you are sending you could add the path as either the WPARAM or LPARAM of the message.

Just say 'NO' to evaluated arguments for diadic functions! Ash

igalep13210-Nov-10 10:09

10-Nov-10 10:09

that's how it works :

IntPtr QTPHandle = FindWindow(null, qtp[0].MainWindowTitle);

     SetForegroundWindow(QTPHandle);

     SendKeys.SendWait("{F4}");//stop record

Richard MacCutchan10-Nov-10 22:36

10-Nov-10 22:36

OK, obviously my suggestion will not work as you are sening a keystroke to a window, rather than invoking a function within the application. Assuming this is going to an external application then I do not think you can do what you are asking.

Just say 'NO' to evaluated arguments for diadic functions! Ash

igalep13210-Nov-10 22:49

10-Nov-10 22:49

but when i open a "save as" dialog isn't it possible to "catch it" ?

Richard MacCutchan11-Nov-10 1:19

11-Nov-10 1:19

igalep132 wrote:
but when i open a "save as" dialog isn't it possible to "catch it" ?

I suppose it is but I don't know how you would add your path into the dialog without knowing which message to send it. I'm also still unsure whether you are sending the "F4" key to an external application, or merely to a Window of your own application. Whichever you are doing will affect what you can or cannot do.

Just say 'NO' to evaluated arguments for diadic functions! Ash

igalep13211-Nov-10 4:31

11-Nov-10 4:31

the "F4" is for "my" app, and my app launch standard windows "Save as" dialog

Richard MacCutchan11-Nov-10 5:07

11-Nov-10 5:07

igalep132 wrote:
the "F4" is for "my" app, and my app launch standard windows "Save as" dialog

So you just need some pice of communication that will allow your path to be sent to your app. Take a look at Luc's answer (and link) below, it will probably help with what you need to do.

Just say 'NO' to evaluated arguments for diadic functions! Ash

C# code to encrypt color image

Luc Pattyn10-Nov-10 10:24

Luc Pattyn

10-Nov-10 10:24

more precisely, you could pass a pointer to a string through LPARAM, however that pointer must point to some valid memory in the target process; this requires some P/Invoking of kernel functions such as AllocateVirtual, ReadProcessMemory, WriteProcessMemory. I once developed a little LP_Process class that encapsulates all this, see e.g. here: LP#TrayIconBuster[^]

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

maheshwari.vetri10-Nov-10 3:19

maheshwari.vetri

10-Nov-10 3:19

i have done the encryption for black and white images but the processing time is high as the size increases.i want a help to lower the process time. i like to know how to modify for color images.i have done the encryption using the base paper"A hash based image encryption algorithm" from a journal published by Elsevier

Re: C# code to encrypt color image

musefan10-Nov-10 3:27

Re: C# code to encrypt color image

10-Nov-10 3:27

Why would a colour image be any different from black and white? (in terms of how you process it)
Also, depending on format of image color and black and white may be the same data size

More info on you code please!!!

Life goes very fast. Tomorrow, today is already yesterday.

Luc Pattyn10-Nov-10 3:33

Luc Pattyn

10-Nov-10 3:33

you should implement encryption on either a file or a data stream, that would allow you to encrypt just anything, and performance would only depend on amount of data, nothing else. Whether it is a color image, a B/W image, an EXE file, ... it does not matter.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

Re: C# code to encrypt color image

Chris Trelawny-Ross11-Nov-10 12:52

Chris Trelawny-Ross

11-Nov-10 12:52

In addition to Luc's suggestion of encrypting off a file stream, have you considered compressing before encrypting? Assuming that your images are not JPG (or some other format that is already compressed) you might get a major benefit from compression.

Create an SQL DB file on demand

musefan10-Nov-10 3:10

Re: Create an SQL DB file on demand [modified]

10-Nov-10 3:10

Hello,

What I am trying to achieve is as follows... I have a database used in an asp.net web app and one of the functions is for a user to download a copy of the database but only with data related to the user. For this I want to provide them with a .MDF file.

What is the best way to create a .MDF file on the fly? From what I understand SQL Server needs to be used but I do not want to create a database in an SQL instance and then have to work out how to detach that database. (This would also be an issue if 2 or more users try to do it at the same time as I would ideally want the database files to be named the same (I have temp folders set up for storing same name files for different users already))

Anyone have any thoughts on this?

Thanks

BTW, apologies for any who think this should go in the database forum (I don't think that quite suits)

Life goes very fast. Tomorrow, today is already yesterday.

phil.o10-Nov-10 4:24

phil.o

10-Nov-10 4:24

Hi,

Maybe you should take a look at Synchronization Framework.
AFAIK you can't use a mdf file outside a SQL Server instance. But you can get .sdf (SQL Server Ce) file from your main database to provide offline access to data.
I can't say much more about that, since I didn't implemented it yet, but I would start searching in that field if I were to deal with such a requirement.

Kind regards.

modified on Wednesday, November 10, 2010 11:04 AM

Re: Create an SQL DB file on demand

musefan10-Nov-10 4:50

Re: Create an SQL DB file on demand

10-Nov-10 4:50

Thanks for the reply, will take a look into it. Not sure it is what I am looking for but maybe it will provide a solution in one form or another.

Life goes very fast. Tomorrow, today is already yesterday.

Eddy Vluggen10-Nov-10 7:23

Eddy Vluggen

10-Nov-10 7:23

As an alternative, you could export the data as an Access database, or a zipped XML file. But do check out the sync framework - imagine the user updating his/her own local database, and having the sync framework update your master-database Smile | :)

I are Troll Suspicious | :suss:

Re: Create an SQL DB file on demand

musefan11-Nov-10 4:00