fprintf: Print formatted strings to a connection

In ctypesio: Read and Write Standard 'C' Types from Files, Connections and Raw Vectors

Print formatted strings to a connection

Description

fprintf_raw() writes the text without a nul-terminator. fprintf() writes a nul-terminator

Usage

fprintf(con, fmt, ..., sep = "\n", useBytes = FALSE)

fprintf_raw(con, fmt, ..., sep = "\n", useBytes = FALSE)

Arguments

con	Connection object or raw vector. When con is a raw vector, new data will be appended to the vector and returned. Connection objects can be created with file(), url(), rawConnection() or any of the other many connection creation functions.
fmt	a character vector of format strings. See sprintf()
...	values to be passed in to fmt. See sprintf()
sep	If there are multiple strings to be printed, this separated will be written after each one.
useBytes	See writeLines()

Value

If con is a connection then this connection is returned invisibly. If con is a raw vector then new data is appended to this vector

See Also

Other data output functions: write_f64(), write_hex(), write_raw(), write_uint8(), write_utf8()

Examples

con <- rawConnection(raw(), "wb")
fprintf(con, "%i,%6.2f", 1, 3.14159)
close(con)

ctypesio documentation built on April 3, 2025, 7:28 p.m.