Windows Forms

24-Sep-09 14:40

I'm developing a program that acts like file manager. Obviously it has to be able to cut/copy/paste files.
When i cut and later paste within my application, I can set a flag that it was a >cut< operation and the files after being copied to destination should be removed from source location.

However, if I am to cut/paste between my app and some external file manager (e.g. Windows Explorer) how can I (my program) tell whether it was >cut< selected, (not a >copy< operation) in the other application ? (also, what to put into clipboard when selecting cut from menu, so that the other application that will paste, would remove files after copying them to destination) ?

Currently I'm using FileDrop type with String array of paths. But how can be encoded >cut< operation ? (some additional format, marker,..?)

Thanks for help,
Michal

Luc Pattyn24-Sep-09 15:04

24-Sep-09 15:04

Most programs work like this:

Cut/Copy/Delete is what happens on the source side; the steps are:
1. if not delete: copy selection to Clipboard
2. if not copy: delete selection

THEN, on the destination side, a potential Paste pastes what is on the Clipboard to the current position, replacing/deleting whatever was selected there if anything.

Now Windows Explorer acts differently: Cut dims the selection but does not delete it until it has been copied somewhere in some Explorer window, and I don't know how they do that. I can come up with ways to achieve that, within a single program, however I don't know which way MS has chosen. I expect there must be a message going back from destination to source to confirm the pasting is done, so the cutting should now be finalized.

Smile | :)

Luc Pattyn

Local announcement (Antwerp region): Lange Wapper? Neen!

michalJ24-Sep-09 15:10

24-Sep-09 15:10

I'm trying to achive the same thing as explorer does and I think that there must be something else placed in clipboard (upon cuting, which results in imediate dimming items) that tells how pasting application should tread source files (leave intact or delete) upon completing paste operation.

Thanks,
Michal

michalJ24-Sep-09 15:30

24-Sep-09 15:30

I guess I know now. It is a memory stream that is placed in Clipboard that tell whether to cut or copy only

const String PREFFERED_DROP_EFFECT_SHELL_CONSTANT = "Preferred DropEffect";
private bool IsItCutOperation(IDataObject dataObject)
        {
            Object isCutOperationMS = dataObject.GetData(PREFFERED_DROP_EFFECT_SHELL_CONSTANT) as MemoryStream;
            if (isCutOperationMS == null)
                return false;

            MemoryStream ms = isCutOperationMS as MemoryStream;

            byte[] array = new byte[ms.Length];
            ms.Read(array, 0, (int)ms.Length);
            
            if(array[0] == (byte)(2))   // 5 copy, 2 cut 
            {
                return true;
            }

            return false;
        }

Thanks,
Michal

Luc Pattyn24-Sep-09 17:02

24-Sep-09 17:02

do you have any link or reference to such wisdom. You did not invent this yourself, did you?

TIA

Luc Pattyn

Local announcement (Antwerp region): Lange Wapper? Neen!

michalJ25-Sep-09 0:51

25-Sep-09 0:51

Drag and drop, cut/copy and paste files with Windows Explorer[^]

I've found a code snippet in this article, and changed it a little to fit my needs.

Regards,
Michal

Luc Pattyn25-Sep-09 4:00

Re: FillByCountry From MSSQL

25-Sep-09 4:00

Thanks,

Luc Pattyn

Local announcement (Antwerp region): Lange Wapper? Neen!

FillByCountry From MSSQL

Sider8924-Sep-09 10:40

Sider89

24-Sep-09 10:40

I want to do this:
When I'll click at the CountryName column(England), I want redirect it to me in the new form where will be corresponding CityNames(London, Birmingem,Liverpool and etc)

in countryForms I have:

<pre> private void dataGridView1_DoubleClick(object sender, EventArgs e)
            {
// here when I call Citys
new City("I want Parameter here").showdialog();
//I am trying to find this parameter like this
foreach (DataRows item in storeHouseDataSet.Countries.Rows)
                  {
                     int b = (int)item["ID"];

                  }
            } </pre>
but it is not what I want Frown | :(

In CityForms:

<pre> private int CountryID;
            //Form1 f;

            public Cities(int countryID)
            {
                  InitializeComponent();
                  CountryID = countryID;
                  //f = new Form1();
            }

            public void Cities_Load(object sender, EventArgs e)
            {
                  this.citiesTableAdapter.Fill(storeHouseDataSet.Cities);
                  this.citiesTableAdapter.FillByCountry(storeHouseDataSet.Cities, CountryID);

            } </pre>

C# Developer

Richard MacCutchan24-Sep-09 23:26

Richard MacCutchan

24-Sep-09 23:26

West1989 wrote:
//I am trying to find this parameter like this
foreach (DataRows item in storeHouseDataSet.Countries.Rows)
{
int b = (int)item["ID"];

}
}
but it is not what I want

1. What is it that you do want?
2. Assuming you want 'b' to have some usable value, then you need to define b in the outer scope, and also break out of the loop when you hit the right value.

Perhaps you could clarify your question?

textBox focus on form Closing

Ali el24-Sep-09 0:21

Ali el

24-Sep-09 0:21

Hi all,
i have a problem with a numeric usercontrol, the problem that i have to validate the value of the textbox to contain only numeric values and number of digits before / after decimal point(i used regular expression to do the validation ). i have the validation on textChange, keyPress and leave, when i leave the textbox i validate it if its not valid i keep the textbox focused. but when i enter a wrong value and directly click save button(which will close the form). the form is closed even i set the focus in the textbox.

any idea to prevent continue in Save_click if the textbox contains wrong value ???!!!
sorry if my description is not clear.

Re: textBox focus on form Closing

Luc Pattyn24-Sep-09 2:01