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mxGetString (C and Fortran) - Copy string mxArray to C-style string

C Syntax

#include "matrix.h"
int mxGetString(const mxArray *pm, char *str, mwSize strlen);

Fortran Syntax

integer*4 mxGetString(pm, str, strlen)
mwPointer pm
character*(*) str
mwSize strlen

Arguments

pm

Pointer to a string mxArray; that is, a pointer to an mxArray having the mxCHAR_CLASS class.

str

Starting location for the string. mxGetString writes the character data into str and then, in C, terminates the string with a NULL character (in the manner of C strings). str can point to either dynamic or static memory.

strlen

Maximum number of characters to read into str. Typically, in C, you set strlen to 1 plus the number of elements in the string mxArray to which pm points. See the mxGetM and mxGetN reference pages to find out how to get the number of elements.

Returns

0 on success, and 1 on failure. Possible reasons for failure include

• mxArray is not a string array.

• strlen is not large enough to store the entire mxArray. If so, the function returns 1 and truncates the string.

Description

Call mxGetString to copy the character data of a string mxArray into a C-style string in C or a character array in Fortran. The copied string starts at str and contains no more than strlen-1 characters in C (no more than strlen characters in Fortran). In C, the C-style string is always terminated with a NULL character.

If the string array contains several rows, the function copies them into one long string array, one column at a time.

Multibyte Character Sets

Use this function only with strings that represent single-byte character sets. For strings that represent multibyte character sets, use the C function mxArrayToString. Fortran users must allocate sufficient space for the return string to avoid possible truncation.

C Examples

Examples:

• explore.c in the matlabroot/extern/examples/mex folder

• mxmalloc.c in the matlabroot/extern/examples/mx folder

See Also

mxArrayToString, mxCreateCharArray, mxCreateCharMatrixFromStrings, mxCreateString

mxGetScalar (C and Fortran)

mxIsCell (C and Fortran)

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