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Hello All,
I need help for the following subject:
I will insert a HW into usb port of my PC, and I want my program to automatically detect the HW and give me the Port Name (or number) and some inforrmation about the inserted HW?
Thanks,
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Hi,
Write WndProc in the code and check for device attached/detached event.(There is one event for this. Try to search on net.)
After getting event write a code to read registry for com port information.
When an device is plugged to USB port an entry is made in the registry.
HKEY_LOCAL_MACHINE/DEVICEMAP/SERIALCOMM
So, you can listen for the changes in this key. And will get to know com port at which device is attached.
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as i said i have a form and textbox. in the textbox i write greek characters and i want to write this textbox into a file.txt
if a save a greek word in the file.text it writes question marks(???????)
please help me. what i have to configure?
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You need to encode your text file as ISO-8859-7.
I think StreamWriter takes encoding as its parameter.
When you're alone in the Dark, Fear will protect you...
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i just use
bt is a byte border which i encoded it
bt = System.Text.Encoding.ASCII.GetBytes(s);
s is the textbox for example
filestream.Write(bt, 0, bt.Length);
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I don't know a lot about Encoding but I think ISO-8859-7 and ASCII are not the same. Try this:
StreamWriter sw = new StreamWriter(@"C:\GreekTest.txt", flase, Encoding.GetEncoding("ISO-8859-7"));
sw.WriteLine("αβγδε");
sw.Close();
StreamReader sr = new StreamReader(@"C:\GreekTest.txt", Encoding.GetEncoding("ISO-8859-7"));
Console.WriteLine(sr.ReadLine());
sr.Close();
It worked for me. Hope help you.
Life is 5: 3 me, 1 you.
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Hi
is it posible to make longer timeout connection ?
i'll try to wright: conn.ConnectionTimeout = 30;
buy it "Read Only" and send me an Error
how can i do it ?
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E_Gold wrote: is it posible to make longer timeout connection ?
Connection timeout is part of the connection string. Try defining "...Connection Timeout = 60..." (60 seconds) in the connection string.
The need to optimize rises from a bad design.
My articles[ ^]
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I am filling dataset from excel. But all rows are not appearing in dataset. Because I am having Numbers and characters in same column in Excel.
But In dataset I am getting only numbers in that column. So please help how can I have All rows in dataset.
Snapshot is attached with code: http://i33.tinypic.com/294nrew.jpg
Thanks.
Manoj
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I recall there is some setting in the connection string that helps with this issue.
It is the IMEX=1 setting. Not sure if 1 was the correct value, but a few searches should present the correct answer.
http://www.connectionstrings.com/?carrier=excel[^]
xacc.ide - now with TabsToSpaces support IronScheme - 1.0 beta 1 - out now! ((lambda (x) `((lambda (x) ,x) ',x)) '`((lambda (x) ,x) ',x))
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Thanks it is working.
strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;" +
"Data Source=" + txtUrl.Text + ";" +
"Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'";
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I used several forms in my project.
I have one big problem: when I want to click the button on the non-activated form (i.e., non-current form), then I have to click two times (first time just activate the form and it works only for the second click). Actually, for most softeares we use everyday, we only need to click once even the button on the form is not activated or not current form.
I have tried several functions, but non works. I think most people will meet this problem. I really don't know how do you solve this?
thanks.
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You can activate the form on hover.
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Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway
Most of this sig is for Google, not ego.
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Which is faster? I have a class that loops through consitantly monitoring input and filters down tot he correct path based off multiple factors, I noticed now that my paths that are down the nested if by 7 or 8 layers take as long as 2 seconds to execute.
Will porting over my code to select / case statements increase efficiency?
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I prefer if statements for non-numeric comparisons and case statements for integral comparisons of large sets. Likely the code slowness is due to algorithm inefficiency than control-flow structure as .NET uses a nifty cheat to make cases work fast on strings. Post some code.
Need software developed? Offering C# development all over the United States, ERL GLOBAL, Inc is the only call you will have to make.
Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway
Most of this sig is for Google, not ego.
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For me, it's a matter of readability, and then suitability of purpose. Heavily nested if statements are generally harder to read than a switch statement. Unless I feel a crying need to use if (less than three nested if's), I'll use a switch statement.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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So there is no actual efficiency when using a select case over a bunch of if statements?
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I don't know if you'd notice an efficiency using either one unless you were going to have more a handful of cases. Most of my switch statements never exceed more than a dozen cases.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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EliottA wrote: So there is no actual efficiency when using a select case over a bunch of if statements?
In your situation, there is no "actual efficiency" in terms of performance using if statements vs using switch statements. If your deepest loops are taking 2 seconds to execute, switching from if to switch may improve your execution time by the tiniest fraction of a millisecond.
But that's besides the point. Unless you absolutely need to shave milliseconds off your code, decisions about how your code is organized should be about readability and communicating your intent to future readers of the code. Don't prematurely optimize.
That aside, there is more opportunity for a compiler to optimize long switch statements than with a series of if statements. The compiler will typically convert if statements into a series of compare-and-jump operations. Switch statements (in C#) can be implemented using techniques like jump tables (when comparing ints) or hash tables (when comparing strings) to increase code efficiency. But we're talking about real low-level, behind-the-scenes stuff that the average developer will likely never have to consider in real-world applications.
Enjoy,
Robert C. Cartaino
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A switch is implemented differently depending on how many labels there are in it. If there are more than five (IIRC) labels, it's implemented using a hash table. If there are fewer labels it's implemented using if/else tests, so the earlier labels are the fastest to reach, but when it's implemented using a hash table it takes the same time to reach any of the labels.
So, if you have more than five if/else checks on the same value, you should definitely replace it with a switch.
Despite everything, the person most likely to be fooling you next is yourself.
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It also means that if you want a fast switch statement, and you have less than five cases, pad the switch statement with do-nothing cases to get the speed gain over the if/else nest.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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No, the if/else implementation is still faster for a switch with very few items.
Despite everything, the person most likely to be fooling you next is yourself.
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Hi,
for or readability/maintainability the switch is best.
for performance it very much depends on the probability distribution. If one or a few cases are much more likely than all the others, use chained if/else for these cases (ordered by descending probability), then handle the remaining stuff with a switch; that way you avoid the switch overhead most of the time.
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