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CString—Wolfram Documentation

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"CString"

represents a string compatible with C.

• "CString" can be used in Typed and related constructs to specify a type.
• Objects with type "CString" are not automatically memory managed and must be manually freed.
• "CString" is a macro for "CArray"::["CChar"].
• "CString" is equivalent to char* or unsigned char* in C.

Arrays
• Array types can be Cast to managed C strings. Supported array types include "ListVector", "NumericArray" and "PackedArray".
"String"
• Cast can be used to convert "String" objects to managed C strings.
"RawPointer" and "OpaqueRawPointer"
• Cast can be used to bitcast C strings to and from raw pointers.

Compile a function that creates a managed C string and passes it to the C standard library function strlen to get its length:

Evaluate the compiled function on a string:

Compile a function that parses a C string to a number using the atof library function from the C standard:

Evaluate the compiled function:

Convert a "CInt" to a string and store it in a managed C string of size 512:

C strings created outside of a "Managed" object are not automatically memory managed, and must be freed manually. Compile a function that creates unmanaged C strings:

The function leaks memory:

Use DeleteObject to manually free the C strings:

The resulting function does not leak memory:

Introduced in 2022 (13.1)

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