Re: Threading safety with windows form - C# Discussion Boards

how to retrieve the version of ms word installed?

khchan5-Oct-04 19:07

5-Oct-04 19:07

Hi,

How do I check whether the user has M$ Word installed, and how do I check which version of Word that the user has installed?

thanks Smile | :)

Re: how to retrieve the version of ms word installed?

Anonymous5-Oct-04 22:12

Anonymous

5-Oct-04 22:12

What I do is call Registry.LocalMachine.OpenSubKey to read the registry at:
"Software\Microsoft\Windows\CurrentVersion\App Paths\Winword.exe" and use regKey.GetValue to get the value of the key "Path"

If it returns null then word is not installed.
Otherwise it gives you the path to winword.exe and then you can call FileVersionInfo.GetVersionInfo to get the version number.

plot 2d Line Graph Using GDI+

xiaowenjie5-Oct-04 18:58

xiaowenjie

5-Oct-04 18:58

How do i plot 2D LineGraph using GDI+ on Windows Form?

Chris

Re: plot 2d Line Graph Using GDI+

Robert Rohde5-Oct-04 19:10

Robert Rohde

5-Oct-04 19:10

You could search CodeProject for controls made by others. Some of those look really cool.
If you want to make it yourself:
Override the OnPaint method in your Control or Form class, get the Graphics object from the event arguments and play around with the DrawLine method.

Change the color of a selected date in DataTimePicker

xiaowenjie5-Oct-04 18:01

xiaowenjie

5-Oct-04 18:01

how do i change just the selected date in dateTimePicker to a different color based on a certain condition?

Chris

Threading safety with windows form

mitreviper5-Oct-04 17:23

mitreviper

5-Oct-04 17:23

Hi all,

I read some books that manipulating the window form components using a thread other than a main thread can cause bugs that are not repeatable. Is there any example code of how to get around this ?

And next, the documentation in MSDN often have the following statement. Its confusing for me. So when is a member public static and when is it an instance member? Confused | :confused:

Thread Safety
Any public static (Shared in Visual Basic) members of this type are safe for multithreaded operations. Any instance members are not guaranteed to be thread safe

Re: Threading safety with windows form

Alex Korchemniy5-Oct-04 17:45

Alex Korchemniy

5-Oct-04 17:45

You can use the Invoke method of the Control class to safely call a piece of code that does a UI task.

There's a lot of other things to learn about thread safety. Have fun

Re: Threading safety with windows form

Stefan Troschuetz5-Oct-04 20:58

Stefan Troschuetz

5-Oct-04 20:58

A member is public static when it is declared public static and therefor can be accessed without an instance of the class. An instance member on the other side can only be accessed by using an object of the class. A short example:

public class Test
{
// No instance needed to access this member
public static int StaticMember;
// Need an instance to access this member
public int InstanceMember;
}

Test.StaticMember = 5;
Test obj = new Test;
obj.InstanceMember = 5;

www.troschuetz.de

Can I pass an arrayList as arguments to MFC dll and return an CArray object from MFC dll to c# as arrayList using P/Invoke?

ting6685-Oct-04 16:17

ting668

5-Oct-04 16:17

As title
If yes, when is the data type in mfc dll?

Thanks

TextBox w/ transparent bg

Anonymous5-Oct-04 14:48

Anonymous

5-Oct-04 14:48

I'm trying to find a subclasses Textbox with transparent background or a replacement for the textbox that supports transparent bg. I don't know win api well enough so I'm looking for some clean code.

I've searched and keep running into an article on CP on AlphaBlendTextBox. BUT, that article is P.O.S. I've tried using it and it doesn't work properly. The author made a hell of a messy implementation. He tried to give the user the ability to set background images for the textbox. I do not want to have a mess implementation that requires a PictureBox docked inside the TextBox control. I just need to have a transparent bg.

bitmaps

cmarmr5-Oct-04 14:43

cmarmr

5-Oct-04 14:43

i have documents scaned as bitmaps and they are scaned as legal documents but not all of them are legal is there a way i can read the bottom of the bitmap and see if the last 3 in are white cut off the last 3 in and print on letter papper instead of legal

thanks
chad

One Program Controls Another?

BonJoviJones5-Oct-04 12:40

BonJoviJones

5-Oct-04 12:40

I have a legacy windows application that needs to automated. I have no access to the source code.

I would like to write a seperate (new) C# application to interact with the legacy app.

Basically the legacy app presents graphical data to the user and the user classifies the data. Classifaction is done by clicking one of a couple of buttons.

When the legacy app was written there was, apparently, no widely known/good method to classify this data, though humans (once trained) are able to do it quickly.

I've come up with and algorithm that should make the job easier, as it can classify maybe 70% of all cases automatically. The other 30% still require human intervention, but that's still a big improvement.

The goal then, is to have both apps running, both minimized and out-of-sight _unless_ the algorithm is unable to correctly classify the data (in which case it can just um-minimize the legacy app and make the user deal with it)

Basically, there are a two things I need help getting started with:

1. Getting graphical data from a minimized window 2. Programatically clicking buttons on a minimized window

Could anyone provide pointers to APIs or techniques I might look in to? I'm not asking for a solution (though I'd take them if you've got them Wink | ;)

), but more along general pointers.

Thanks

Re: One Program Controls Another?

Alex Korchemniy5-Oct-04 17:54

Alex Korchemniy

5-Oct-04 17:54

Poor you. I really hate the way you're going be using automation, but I guess ur kinda stuck. The ultimate solution is to rewrite the program but that obviously is not feasible.

You're going to have to do some stuff with win32 api. Look into MSDN... you need to know how to

- get a handle to a window (this is used to "identify" what you are sending a message to)
- use SendMessage() - this is used to send a message to the windows/control u want to send a message to
- know what messages to send - there are a lot of messages you can play around with

A good tool to use for messing around is Micorosft Spy++. Also, google is your friend. You can search for "programatically click button" and u will find it in a snap.

Progress Bar

Lash205-Oct-04 11:56

Lash20

5-Oct-04 11:56

I recently just started working with C# and really haven't quite figured out how to put a "handle" on a process to update a progress bar.

I would really appreciate it if someone can show me how to show the progress of a query being run on a database... on a progressbar.

Thanks in advance.

Lash

Re: Progress Bar

Alex Korchemniy5-Oct-04 12:53

Alex Korchemniy

5-Oct-04 12:53

You mentioned query being run on a database...

You can't really get a "handle" for that. Roll eyes | :rolleyes:

What you can do is if you have a batch of queries that you are executing and you know how many you can obviously keep track of how far you got.

Re: Progress Bar

Dave Kreskowiak5-Oct-04 17:13

Dave Kreskowiak

5-Oct-04 17:13

Unless the database your using can provide you with some kind of progress "heart beat" while executing a single query, like a SELECT query, there is no way to do this. No RDBMS I know of will do this simply because it's impossible for the engine to predict how many records are going to be affected by the query that its executing. If you don't know where your destination is, it's impossible to track your progess to it, isn't it?

As mentioned in the other post, the closest your going to get is if you are executing multiple requests. You can execute those requests one at a time and update the ProgressBar between requests.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Progress Bar

Lash206-Oct-04 4:02

Lash20

6-Oct-04 4:02

Thanks guys for your response, Is there a "work around" to at least show the user some type of progress while executing....say... a single select statement ?

Re: Progress Bar

Dave Kreskowiak6-Oct-04 13:06

Dave Kreskowiak

6-Oct-04 13:06

You can't show actual "progress" because there isn't any until the SELECT statement returns. But you can show a activity bar resembling the one the you see when installing Windows XP.

Building a Progress Bar that Doesn't Progress[^]

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

"NO Such interface supported" C# to Excel

Ruchi Gupta5-Oct-04 11:20

Ruchi Gupta

5-Oct-04 11:20

Hi All,

I am getting this error "NO Such interface supported" when from my C# application I am trying to export rows to Excel.

This is a problem only on certain user machines and they are running same vesion of Excel (i.e. 2000)

In refernce to Microsoft article http://support.microsoft.com/default.aspx?scid=kb;EN-US;316653[^]
I did ILDASM on Interop.Excel.dll in my program files and found that classes with suffix _SinkHelper are all Public. But on that users machine it is private. I am wondering why such inconsistency with the same setup project.

Any help and pointers are appreciated.

Thanks
Ruchi

Log to Access database from C#

hans175-Oct-04 10:15

hans17

5-Oct-04 10:15

I am working on a Visual Studio C# data acquisition application. I need to log acquired data to an Access data base.
I have the acquired data stored in my application in a DataTable. I want to append all columns of the DataTable to an Access table.

Since my application will be acquiring data over long periods of time, I don't want to keep all the rows of acquired data in a DataSet - once I write them to the database, I don't want to keep them an every growing DataTable in my application.

The only way I've been able to get this working is to use ExcuteNonQuery with
DbCmd.CommandText="INSERT INTO " + DestTableName + " (" + fields + ") VALUES (" + values + ")";

That's OK, except that I have to build up the INSERT INTO field names and values by iterating thru the table's columns and creating field text from the column names and value text from the column values.

Is there a way to simplify this by using * or some other means to select all the columns of the data row for insertion ito the data base table, so I don't have to build up the field and value strings every time I write to the database? (I suppose I could just build the fields text once since it won't be dynamic.)

Here's my code to insert one row of data into the Access database:

public static int RecordData(DataRow SourceRow, string DestTableName)
{
int NumRecordsAdded = 0;

string fields = "";
string values = "";

foreach (DataColumn col in SourceRow.Table.Columns)
{
//Don't record Key - it creates an SQL syntax error, must be a reserved word
if ( col.ColumnName.ToUpper() != "KEY")
{

if (SourceRow[col.ColumnName] == DBNull.Value)
{
//TODO Flag something if data column not filled
string ErrorMsg = "Data Recording Error - Data Column: " + col.ColumnName + "has no data";
SourceRow[col.ColumnName] = 0;
}

if (fields != "")
fields = fields + ", ";
fields = fields + col.ColumnName;

if (values != "")
values = values + ", ";

System.TypeCode ColTypeCode = System.Type.GetTypeCode(col.DataType);

switch (ColTypeCode)
{
//TODO Handle other data types?

case System.TypeCode.Int32:
values = values + ((Int32)SourceRow[col.ToString()]).ToString();
break;
case System.TypeCode.Double:
values = values + ((double)SourceRow[col.ToString()]).ToString();
break;
case System.TypeCode.String:
values = values + "'" + (string)SourceRow[col.ToString()] + "'";
break;
default:
values = values + "'" + SourceRow[col.ToString()].ToString() + "'";
break;
}
}
}

try
{
LogDB_Connection.Open();

OleDbCommand DbCmd= new OleDbCommand();
DbCmd.Connection = LogDB_Connection;

DbCmd.CommandText="INSERT INTO " + DestTableName + " (" + fields + ") VALUES (" + values + ")";
//MessageBox.Show(DbCmd.CommandText);
NumRecordsAdded = DbCmd.ExecuteNonQuery();

}
catch(Exception e)
{
MessageBox.Show("DB Command Exception '" + e.ToString() + "'");
}

LogDB_Connection.Close();

return NumRecordsAdded;
}

Hans

printing with c#

Member 12961365-Oct-04 9:01

Member 1296136

5-Oct-04 9:01

Hi,
I need to print text using a printer which is not capable of printing graphics, hterefore Graphics.DrawString fails.

Is there any alternative way to print avoiding DrawString method?

Thanks

Sirwan

Re: printing with c#

Anonymous5-Oct-04 14:28

Anonymous

5-Oct-04 14:28

Printing Directly to the Printer

http://www.c-sharpcorner.com/Code/2002/Oct/PrintDirect.asp

Re: printing with c#

Member 12961367-Oct-04 7:06

Member 1296136

7-Oct-04 7:06

Thanks for the help, it didn't work with the printer star sp200, not hp as it said, there is no response whatsoever.

i use windows app not console and need to print few word not a document.
Are you aware of any other way?

Cheers
Hussein

Sirwan

Using ArrayList in C sharp

aussi5-Oct-04 8:59

aussi

5-Oct-04 8:59

Hi I need to make use a data structure to save a 2D data, let say node_id and node_status and later on I need to manipulate the node_status as necessary. Then I need to count down the nodes as per their staus. Let say the number of nodes whose shatus are 'off', and the rest, whose status are 'on' Should I use an ArrayList ? or an array ? In each case, how do I store, manipulate and search thorugh...and the problem is I am having trouble where/how to collect data into the ArrayList or array.

Thanks. here goes the part of code where I am having problem to implement the data sturcture:

  int i;<br />
int num;<br />
int numsect;<br />
			<br />
	num = NUM_NODES;<br />
	ArrayList nbuffer = new ArrayList();<br />
	for(i=0; i < num; i++) <br />
	{ // for each node<br />
	  int j;<br />
	  numsect = nodes[i].sector_info.numsect;<br />
	  for(j=0; j < num; j++) <br />
	  { // for each node<br />
	     double distance, angle, covrdArea;<br />
	     distance = caldist(nodes[i].lctn, nodes[j].lctn);<br />
									<br />
	     if(distance <= (2*((double)nodes[i].radius)) && distance > 0.0) <br />
	     {// the node is in transmission range<br />
	     angle = getangle(nodes[i].lctn, nodes[j].lctn, distance);<br />
	     //sector_id = nodes[i].neiglist.ngsectlist[j].sectorid;<br />
						<br />
	     covrdArea = getArea(nodes[i].id, nodes[j].id, distance, angle);<br />
						<br />
	     tw.WriteLine("Distance form Node_" + nodes[i].id + " to Neighbour Node_" + nodes[j].id + " is " + distance);<br />
	     tw.WriteLine("Angle btw Node_" + nodes[i].id + " in sect " + numsect + " to Neighbour Node_" + <br />
                              nodes[j].id + " is " + angle);<br />
	      tw.WriteLine("Neighbouring Node_" + nodes[j].id + " is covering " + covrdArea + " percent of Node_" +<br />
                              nodes[i].id + "'s sensing area");<br />
								<br />
<br />
	    }//if (distance..<br />
	  }//for (j...<br />
	tw.WriteLine("----------------- END OF NEIGHBOUR_LIST OF NODE_" + nodes[i].id +" --------------------------");<br />
	tw.WriteLine("");<br />
	nbuffer.Add(nodes[i].id);<br />
     }//for (i...<br />
     nbuffer.Clear();<br />
				<br />
     tw.Close();<br />
}//end of method getsimInfo

Thanks

aussi

Re: Using ArrayList in C sharp

Christian Graus5-Oct-04 11:48

Christian Graus

5-Oct-04 11:48

If you're storing a pair, is one of the values unique ? Perhaps a hashtable is a better choice.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Last Visit: 31-Dec-99 18:00 Last Update: 2-Jul-24 0:14

Refresh

ᐊ Prev 1...13420 13421 13422 134231342413425 13426 13427 13428 13429 Next ᐅ

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.