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Function Details : catopen

nl_catdcatopen(const char * name,int oflag) ;

Return Type : nl_catd

A data type representing a message catalog descriptor, used to identify and access message catalogs in functions like `catopen`, `catgets`, and `catclose`.
Read about return values of catopen function .

1st Parameter Type : const char *

Pointer to read-only string

1st Parameter

The name of the message catalog to be opened

2nd Parameter Type : int

Integer type (typically 4 bytes, -2,147,483,648 to 2,147,483,647)

2nd Parameter

Flag specifying how the catalog should be opened (e.g., `NL_CAT_LOCALE`)

Read more about parameters of catopen in parameters section
The catopenfunction in C language Opens a message catalog.
The catopen function opens a message catalog and returns a catalog descriptor. This descriptor can be used with subsequent calls to catgets to retrieve messages from the catalog. The function uses the NLSPATH environment variable to find the message catalog unless a full pathname is given. The oflag parameter is used to specify the type of access, usually set to 0 for default behavior.
The catopenfunction takes 2 parameters:
  • •
    const char * `name`: The name of the message catalog to be opened
  • •
    int `oflag`: Flag specifying how the catalog should be opened (e.g., `NL_CAT_LOCALE`)
Opens a message catalog for reading, returning a catalog descriptor of type `nl_catd` to be used with other message catalog functions.
The catopen function return value :
  • Returns a catalog descriptor if successful, or (nl_catd) -1 if an error occurred (in which case, errno is set to indicate the error)

Output

This example demonstrates the basic usage of `catopen` to open a message catalog named 'messages'. It also shows proper error checking and closing of the catalog.