CONTROL
- Introduction to CTRL
- CONTROL Classes
- Types of Control Functions
- CONTROL graphics
- CONTROL Functions
  - Funtions A
  - Funtions B
    - base64Decode()
      Decodes base64 encoded data.
    - base64Encode()
      Encodes data in the base64 encoding.
    - baseName()
      The function returns the last part of a file path.
    - beep()
      Issues a beep.
    - bitmapEditor() - obsolete
      This function opens the bitmap editor. To be able to use the function, the PVSSBitmapEditor.dll has to exist in the directory <version_path>/bin (obsolete from version 3.5 up).
    - blobAppendValue()
      Works like blobSetValue(), but the value is appended to the blob.
    - blobGetValue()
      Reads "value" from byte offset "offset" with "len" bytes from blob.
    - bloblen()
      The function returns the length of a blob in bytes.
    - blobRead()
      The function blobRead() reads the content of a file into a blob variable.
    - blobSetValue()
      Writes "value" from byte position "offset" with "len" bytes to the blob.
    - blobWrite()
      The function blobWrite writes the content of a blob variable into a file.
    - blobZero()
      Sets blob length to len bytes and initialize the blob with "0".
    - byteSizeToString()
      Converts a filesize in bytes to a string (for example, with getFileSize()).
  - Funtions C
  - Funtions D
  - Functions E
  - Functions F
  - Functions G
  - Functions H
  - Functions I
  - Functions J
  - Functions K
  - Functions L
  - Functions M
  - Functions N
  - Functions O
  - Functions P
  - Functions Q
  - Functions R
  - Functions S
  - Functions T
  - Functions U
  - Functions V
  - Functions W
  - Functions X
  - Functions Y
  - Functions Z
- CTRL-Debugger
  Der CTRL-Debugger ermöglicht ein Debuggen der Pogrammiersprache Control.

blobZero()

Sets blob length to len bytes and initialize the blob with "0".

Synopsis

int blobZero(blob &target, int len);

Parameters


Parameter	Description
&target	The Blob
len	Length of the blob

Return Value

With an error -1, otherwise the length of the blob.

Errors

Missing or wrong arguments

Descriptions

If data are sent in a blob, then the data have to be treated with CTRL functions for using the data in CTRL. The function blobZero() sets the blob length to len an initialize the blob with "0".

Example

main()
{
  blob target;
  int len;
  string s;
  s = "FFAB003A";
  target = s;
  DebugN(target);
  len = 30;
  DebugN("Blob Zero : " + blobZero(target, len ));
}

Assignment

Blob functions

Availability

CTRL