How to remove the first or last space from a string

yanbin

For example, I have a string str= ' this is a string ', there are spaces at the beginning and the end of this string, how can I remove it in Netlinx studio?

Thanks

Auser

Depending on your application, here's something I just cranked out (untested). You'll need to define MAX_WIDTH_STRING.

DEFINE_CONSTANT
#IF_NOT_DEFINED HT
  HT = $09
#END_IF

// Name   : ==== Trim Left ====
// Purpose: Trim leading spaces from a string
// Params : (1) IN/OUT  - char inputdata[]/char formatteddata[]
// Returns: Char array representing the input string with leading spaces removed
// Notes  :
//
define_function char[MAX_WIDTH_STRING] TrimLeft(char _cInputString[])
{
  stack_var integer  _nResultStartPos
  
  _nResultStartPos = 1
  while
  (
    (_nResultStartPos <= length_array(_cInputString)) &&
    (
      (_cInputString[_nResultStartPos] = ' ') ||
      (_cInputString[_nResultStartPos] = "HT")
    )
  )
  {
    _nResultStartPos++
  }
  if(_nResultStartPos <= length_array(_cInputString))
    return right_string(_cInputString, length_array(_cInputString) - _nResultStartPos + 1)
  else
    return ''
}

// Name   : ==== Trim Right ====
// Purpose: Trim trailing spaces from a string
// Params : (1) IN/OUT  - char inputdata[]/char formatteddata[]
// Returns: Char array representing the input string with leading spaces removed
// Notes  :
//

define_function char[MAX_WIDTH_STRING] TrimRight(char _cInputString[])
{
  stack_var integer  _nResultStartPos
  
  _nResultStartPos = length_array(_cInputString)
  while
  (
    (_nResultStartPos) &&
    (
      (_cInputString[_nResultStartPos] == ' ') ||
      (_cInputString[_nResultStartPos] == "HT")
    )
  )
  {
    _nResultStartPos--
  }
  if(_nResultStartPos)
    return left_string(_cInputString, _nResultStartPos)
  else
    return ''
}

// Name   : ==== Trim ====
// Purpose: Trim leading and trailing spaces from a string
// Params : (1) IN/OUT  - char inputdata[]/char formatteddata[]
// Returns: Char array representing the input string with leading and trailing spaces removed
// Notes  :
//
define_function char[MAX_WIDTH_STRING] Trim(char _cInputString[])
{
  stack_var char _cResultString[MAX_WIDTH_STRING]
  // Remove leading spaces from the string
  _cResultString = TrimLeft(_cInputString)

  // Remove trailing spaces from the string
  _cResultString = TrimRight(_cResultString)

  return _cResultString
}

yanbin

Auser wrote: »

Depending on your application, here's something I just cranked out (untested). You'll need to define MAX_WIDTH_STRING.

// Name   : ==== Trim Left ====
// Purpose: Trim leading spaces from a string
// Params : (1) IN/OUT  - char inputdata[]/char formatteddata[]
// Returns: Char array representing the input string with leading spaces removed
// Notes  :
//
define_function char[MAX_WIDTH_STRING] TrimLeft(char _cInputString[])
{
  stack_var integer  _nResultStartPos
  
  _nResultStartPos = 1
  while
  (
    (_nResultStartPos <= length_array(_cInputString)) &&
    (
      (_cInputString[_nResultStartPos] = ' ') ||
      (_cInputString[_nResultStartPos] = "HT")
    )
  )
  {
    _nResultStartPos++
  }
  if(_nResultStartPos <= length_array(_cInputString))
    return right_string(_cInputString, length_array(_cInputString) - _nResultStartPos + 1)
  else
    return ''
}

// Name   : ==== Trim Right ====
// Purpose: Trim trailing spaces from a string
// Params : (1) IN/OUT  - char inputdata[]/char formatteddata[]
// Returns: Char array representing the input string with leading spaces removed
// Notes  :
//

define_function char[MAX_WIDTH_STRING] TrimRight(char _cInputString[])
{
  stack_var integer  _nResultStartPos
  
  _nResultStartPos = length_array(_cInputString)
  while
  (
    (_nResultStartPos) &&
    (
      (_cInputString[_nResultStartPos] == ' ') ||
      (_cInputString[_nResultStartPos] == "HT")
    )
  )
  {
    _nResultStartPos--
  }
  if(_nResultStartPos)
    return left_string(_cInputString, _nResultStartPos)
  else
    return ''
}

// Name   : ==== Trim ====
// Purpose: Trim leading and trailing spaces from a string
// Params : (1) IN/OUT  - char inputdata[]/char formatteddata[]
// Returns: Char array representing the input string with leading and trailing spaces removed
// Notes  :
//
define_function char[MAX_WIDTH_STRING] Trim(char _cInputString[])
{
  stack_var char _cResultString[MAX_WIDTH_STRING]
  // Remove leading spaces from the string
  _cResultString = TrimLeft(_cInputString)

  // Remove trailing spaces from the string
  _cResultString = TrimRight(_cResultString)

  return _cResultString
}

Thanks Auser!

yanbin

Also if I want to send text to multiple buttons, for example, if I want to sent text 'CD' to variable text channel 1,2,3,5 with one command, , how can I do it?

Will this command work? send_command TP,"'TEXT1,2,3,5-CD'"

Auser

yanbin wrote: »

Thanks Auser!

I've just updated that code snippet to include a definition for the horizontal tab ASCII character which I had inadvertently omitted.

vining

From PI

"'^TXT-<variable text address range>,<button states range>,<new text>'"

Assign a text string to those buttons with a defined address range.

Sets non-unicode text.



Syntax:

SEND_COMMAND <DEV>,"'^TXT-<vt addr range>,<button states range>,<new text>'"



Variables:

variable text address range = 1 - 4000.

button states range = 1 - 256 for multi-state buttons

(0 = All states, for General buttons 1 = Off state and 2 = On state).

new text = 1 - 50 ASCII characters.



Example:

SEND_COMMAND Panel,"'^TXT-500.504&510.515,1&2,Test Only'"

Sets the On and Off state text for buttons with the variable

text ranges of 500-504 & 510-515.

In the above example "Test Only" will be sent to buttons with a variable text address of 500 to 504 and to 510 through 515.

BMF can do this too (I think) but the ^TXT is a bit simpler.

yanbin

vining wrote: »

From PI

In the above example "Test Only" will be sent to buttons with a variable text address of 500 to 504 and to 510 through 515.

BMF can do this too (I think) but the ^TXT is a bit simpler.

So Send-command tp,"'^TXT-1&2&3&5,1&2,Test only'" will send text to button 1,2,3 and 5?

vining

yanbin wrote: »

So Send-command tp,"'^TXT-1&2&3&5,1&2,Test only'" will send text to button 1,2,3 and 5?

Well off the top of my head I don't how many times you can use "&" but it might work as you described.

I would write it like this:

So Send-command tp,"'^TXT-1.3&5,0,Test only'" will send text to button 1,2,3 and 5? 

I would use the . (dot) operator so 1 through 3 (1.3) and 5 (&5) and for states 0 equals states 1 & 2.

jjames

FYI

Question: Is there a way to remove the spaces before or after characters in a string?
Answer: TRIM_STRING

Question: Is there a way to search for characters in a string starting at the end?
Answer: FIND_STRING_REV

Question: Is there a way to replace specific characters, or remove specific characters, from a string?
Answer: REPLACE_STRING

Question: Is there a way to assign sub-strings separated by delimiters from a string to an array?
Answer: SPLIT_STRING

Question: Is there a way to count the number of times a pattern of characters occurs in a string?
Answer: COUNT_STRING

Auser

Huh, I never new those tech notes existed. My old implementation of trim used the while(whitespace): left_string()/right_string() construct used in the tech note. When I looked at it yesterday when replying to the OP I realised it's horribly inefficient, hence why I hammered out the version I posted. In the tech note method, for every character of whitespace you've got a string copy operation. Depending on the amount of white space and the size of the string that could be very time consuming...

PhreaK

You may also find trim(), ltrim() and rtrim() useful - they're all in the NetLinx Common Libraries string library.

yanbin

vining wrote: »

Well off the top of my head I don't how many times you can use "&" but it might work as you described.

I would write it like this:

So Send-command tp,"'^TXT-1.3&5,0,Test only'" will send text to button 1,2,3 and 5? 

I would use the . (dot) operator so 1 through 3 (1.3) and 5 (&5) and for states 0 equals states 1 & 2.

the variable text channels are random, they can be 1,3,5,7,10, how to send text to them?

vining

yanbin wrote: »

the variable text channels are random, they can be 1,3,5,7,10, how to send text to them?

Try it with the multiple "&" and see if that works, it may. I've never tried to use multiples so I can't say what will happen. If it doesn't then you're back at square one but if it does your golden. Either way let us know cuz I am curious.

yanbin

vining wrote: »

Try it with the multiple "&" and see if that works, it may. I've never tried to use multiples so I can't say what will happen. If it doesn't then you're back at square one but if it does your golden. Either way let us know cuz I am curious.

I tested it with AXD-CV6 and a MVP5200i, send_command tp,"'^TXT-1&3&5&7&10,0,Text Only'" work in MVP5200i but not AXD-CV6, I checked the AXD-CV6 manual, could not find any multiple send text command.

jjames

AXD-CV6 = G3
MVP5200i = G4

^TXT is a G4 command

Aren't the differences between G3 and G4 panels distinguished well enough in the course of AMX training? If not - it should be.

yanbin

jjames wrote: »

AXD-CV6 = G3
MVP5200i = G4

^TXT is a G4 command

Aren't the differences between G3 and G4 panels distinguished well enough in the course of AMX training? If not - it should be.

I realized the difference between G3 and G4 panels, I just want to find a command can do both G3 and G4 panels.