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I wrote a program using an article from Code project as a reference in order to communicate with PIC16F877A using RS232.
I cannot receive any data from the PIC. I tried by sending many data types as, decimal, hex, ASCII eyc... but nothing worked. Plz help me with this, any help would be really appreciated.
THANK YOU
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You want to post this at the bottom of the article- the author should respond.
Also, Hello is not a good subject title.
"More functions should disregard input values and just return 12. It would make life easier." - comment posted on WTF
"This time yesterday, I still had 24 hours to meet the deadline I've just missed today."
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Hi, lacking a lot of essential information, here are just some ideas:
1.
Sending/receiving text is easier to debug than sending/receiving binary data, so if you
have a choice, start experimenting with text. There are many reasons for this: the serial
driver may react on special characters such as CR, LF, ENQ, ACK, CTRL/S, CTRL/Q, etc, which
are not present in normal text, but obviously can appear in arbitrary binary data.
2.
check connection hardware:
use a terminal emulator such as HyperTerminal to check whether anything comes in. Try a
couple of baud rates. If data is not text and/or baud rate is wrong, you probably will
get strange characters; they would prove connection is present.
3.
check transmission first: sending is much less critical than receiving, so try, if you can,
if things you send actually arrive (maybe there is a command available to toggle a LED
or so).
4.
hardware handshake
if you don't get anything, maybe the sender needs some control lines set before it feels
a need to send something; look for the RTS signal ("Request To Send"), or send a software
dataflow character (try sending a CTRL/Q).
5.
port settings
if you do get something, but it does not look right, try different port settings (baud
rate, parity, ...). Choosing "no parity" gives best chances.
6.
if HyperTerminal works, but your app does not, it still may be a port setting/handshake
problem, or a conceptual mistake in your code. Try the others first and let us know.
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google
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Like Malcolm said, you might be better off leaving a message in the discussion forum at the bottom of the article for the author.
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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Hi all,
i have some user controls on the form which fetch data from webservice and display them.
the problem is when the form loads it flickers for some time and then all the control are displayed.
Is there any standard solution for this.
Thanks & Regards,
Pramod
"Everyone is a genius at least once a year"
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Disable control painting until you fetch data from ws
Visit my blog at http://dotnetforeveryone.blogspot.com
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If you do this you will get an ugly effect if you drag another window over your form. I think it would be better to try double buffering, or making the control threaded so that it will be able to repaint itself while loading data.
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Hi guys,
I am having a problem in my application..the prob is that i wanna get the list
of controls on the other form...so what i have done is that
1> I have instantiate the form of which i wanna get the Control list
2> Recurse through a foreach loop and get each control and put the details in a XML file..
Now the main prob that is arising is that the controls are comin i the form in any order(ie textbox,button,textbox etc) and i want to recurse in the order of top to bottom and left to right(ie first label then textbox then again a label and then textbox and so on).
the i have implemented is
Code: ( text )
Form2 frm = new Form2();
foreach (System.Windows.Forms.Control ctr in frm.Controls)
{
.....
}
if anyone can help plz reply and for further clarification do reply....
.Net Developer
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You're using the easy way. If you want to recurse and order it from location you have to check every control position and begin to order it.
The order of controls maintains the jerarchy (containers jerarchy) but real order is the order in whic you have inserted controls(see designer file).
Visit my blog at http://dotnetforeveryone.blogspot.com
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il_masacratore wrote: The order of controls maintains the jerarchy (containers jerarchy)
You mean hierarchy?
Paul Marfleet
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hey the blog for which you have created a link is in some other language then english...plz tell how to convert it in english otherwise please explain in detail as to how get the location of the controls and then add them in the xml file...Please help!!!!!!
.Net Developer
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You cannot get them in any particular order from the controls collection. You will need to loop through the controls collection several times, finding out which control to fetch for every loop.
It should also be possible to add all the controls to a SortedList and write a custom comparer that can determine if one control should be sorted before another depending on Left and Top properties if that is what you want.
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i dont think thats possible...as for me i am creatin an application where i want to convert the whole form presented to me into an XML file and this is dynamically so i dnt knw which controls are there and in which order i just want to fetch those controls on the form in the order in which we usually put the controls ie top to bottom and left to right..
the form may have 10controls also and 50 controls also...
.Net Developer
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I don't see a contradiction there. You just need to define rules to determine how to sort the controls. You will need the rules anyway you turn, because there is no such sorting built in.
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how to manage profile object on shared shared. when i try to run application, server raise permission error.
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I want to display a string instead of number in a DataGridView.
I have a column "Status" in a DataSet which DataType in SQl is int, but when displaying the data in the DataGridView I want to display the meaning for that int.
How i can do that ?
I write function, but it seem doesn't work and it give me an error message:
"private void StatusClarification()
{
for (int i = 0; i < this.dtgCreditInfo.Rows.Count; i++)
{
if (int.Parse(this.dtgCreditInfo.Rows[i].Cells["Status"].Value.ToString()) <= -1)
this.dtgCreditInfo.Rows[i].Cells["status"].Value = "Modified";
if (this.dtgCreditInfo.Rows[i].Cells["Status"].Value.ToString() == "1")
this.dtgCreditInfo.Rows[i].Cells["status"].Value = "New";
if (this.dtgCreditInfo.Rows[i].Cells["Status"].Value.ToString() == "0")
this.dtgCreditInfo.Rows[i].Cells["status"].Value = "Deleted"; }
}"
Assaf
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You haven't explained what error message you get.
Paul Marfleet
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the error is appear in a messagebox:
"The following exception occurred in the DataGridView:
System.Exception:Deleted is not a valid value for int32,--> System.formatException:Input string was not in a correct formt.
at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
at System.number.parseint32(string s, numberStyles style, numberformatinfo info)
at system.componentModel.int32converter.fromstring(string value,numberformatinfo format info)
at System.componentModel.basenumberconverter.convertfrom(itypedescriptorcontext, cultureinfo culture, object value)
---End pf inner execption stack trace---
at system.componentModel.basenumberconverter.convertform(itypedescriptorcontext, cultureinfo culture, object value)
at system.componentModel.typeconverter.convertfrom(object value)
at system.windows.forms.datagridviewdataconnection.pushvalue(int32 boundcolumnindex, int32columnindex, int32 rowindex, object value)
to replace this default dialog please handle the dataerror event.
"
Sorry i typed the message because i don't know how to use the dataerror event.
Thank you in advance
Assaf
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int.Parse fails when the value you are trying to parse is the literal string "Deleted". Obviously, this string value cannot be converted to a number. You should only use int.Parse when you know that the value you are trying to parse can be converted to a number. Otherwise, use int.TryParse.
Paul Marfleet
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(int.Parse(this.dtgCreditInfo.Rows[i].Cells["Status"].Value.ToString())
<= "-1"):
even if i put int.TryPrse i can't run there will be an error:
"No overload for method 'TryParse' takes '1' arguments"
and if i put it like this:
if (this.dtgCreditInfo.Rows[i].Cells["Status"].Value.ToString() <= "-1") because th value of dtgCreditInfo.Rows[i].Cells["Status"].Value is of type int also there will bw an error:
"Operator '<=' cannot be applied to operands of type 'string' and 'string'"
Assaf
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Assaf82 wrote: even if i put int.TryPrse i can't run there will be an error:
"No overload for method 'TryParse' takes '1' arguments"
int.TryParse takes 2 arguments. If you had read the documentation you would know this.
Assaf82 wrote: if (this.dtgCreditInfo.Rows[i].Cells["Status"].Value.ToString() <= "-1") because th value of dtgCreditInfo.Rows[i].Cells["Status"].Value is of type int also there will bw an error:
"Operator '<=' cannot be applied to operands of type 'string' and 'string'"
Use String.Compare to compare 2 strings. However this isn't appropriate in this case and you should cast your first value to an int and do a numeric comparison.
Your questions indicate that you lack basic understanding of the .NET framework. I suggest that you master the language fundamentals before attempting anything more complicated.
Paul Marfleet
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<br />
<br />
foreach (GridViewRow row in dtgCreditInfo.Rows)<br />
{<br />
switch (row.Cells["status"].Text)<br />
{<br />
case "1": row.Cells["status"].Text = "New"; break;<br />
case "0": row.Cells["status"].Text = "Deleted;" break;<br />
default: row.Cells["status"].Text = "Modified"; break;<br />
} <br />
}
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GridViewRow is not a namespace and if i put DataRow instead
the error will be: "System.Data.DataRow does not contain a definition for cells"
Assaf
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Which control are u using to display the data?
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