blobRead()

First the file pvss_scripts.lst is opened in the binary mode (rb). The content of the pvss_scripts.lst file is read and saved in the variable "cont". The second example creates the file pvss_scriptsCopy.lst and writes the content of the blob variable "cont2" into the file "pvss_scriptsCopy.lst". Create two buttons ("Read" and "Write") using the graphics editor and use the first code (see below) for the "Read" button and the second code for the "Write" button.

main()
{
  file f;
  blob cont;
  int read;
  f = fopen("C:/Siemens/Automation/WinCC_OA/3.15/scripts/pvss_scripts.lst", "rb");

//opens a file for reading in the binary mode rb
  read = blobRead(cont, 80000, f);
//the file is read and the content is written into the variable "cont"
  fclose(f);
  DebugN("file","C:/Siemens/Automation/WinCC_OA/3.15/scripts/pvss_scripts.lst", "was read", "Amount of data read:",read);

/* shows that the file was read as well as the amount of data that was read */
}

main()
{
  file f, f2;
  int read;
  blob cont, cont2;
  int write;
  f2 = fopen("C:/Siemens/Automation/WinCC_OA/3.15/scripts/pvss_scripts.lst", "rb");

//opens a file for reading in the binary mode rb
  read = blobRead(cont2, 80000, f2);
  //the file is read and the content is written into the variable "cont2"

  f = fopen("C:/Temp/pvss_scriptsCopy.lst", "wb");

/* creates the file the content is written to. The file is opened in the binary mode */

  write = blobWrite(cont2, f);

/* writes the content of the variable "cont2" into the file pvss_scriptsCopy.lst */
  DebugN("file","C:/Temp/pvss_scriptsCopy.lst", "was written", "Amount of data written:", write);
  fclose(f);
  fclose(f2);
}