curl\_mime\_data(3) Library Functions Manual curl\_mime\_data(3)

# [NAME](#NAME)

curl\_mime\_data - set a mime part's body data from memory

# [SYNOPSIS](#SYNOPSIS)

```
#include <curl/curl.h>
CURLcode curl_mime_data(curl_mimepart *part, const char *data,


                        size_t datasize);
```

# [DESCRIPTION](#DESCRIPTION)

[*curl\_mime\_data(3)*](/man/os/curl/curl_mime_data.3) sets a mime part's body content from memory data.

*part* is the mime part to assign contents to, created with [*curl\_mime\_addpart(3)*](/man/os/curl/curl_mime_addpart.3).

*data* points to the data that gets copied by this function. The storage may safely be reused after the call.

*datasize* is the number of bytes *data* points to. It can be set to *CURL\_ZERO\_TERMINATED* to indicate *data* is a null-terminated character string.

Setting a part's contents multiple times is valid: only the value set by the last call is retained. It is possible to unassign part's contents by setting *data* to NULL.

Setting large data is memory consuming: one might consider using [*curl\_mime\_data\_cb(3)*](/man/os/curl/curl_mime_data_cb.3) in such a case.

# [PROTOCOLS](#PROTOCOLS)

This functionality affects http, imap and smtp

# [EXAMPLE](#EXAMPLE)

```
int main(void)
{


  curl_mime *mime;


  curl_mimepart *part;


  CURL *curl = curl_easy_init();


  if(curl) {


    /* create a mime handle */


    mime = curl_mime_init(curl);


    /* add a part */


    part = curl_mime_addpart(mime);


    /* add data to the part */


    curl_mime_data(part, "raw contents to send", CURL_ZERO_TERMINATED);


  }
}
```

# [AVAILABILITY](#AVAILABILITY)

Added in curl 7.56.0

# [RETURN VALUE](#RETURN_VALUE)

This function returns a CURLcode indicating success or error.

CURLE\_OK (0) means everything was OK, non-zero means an error occurred, see [*libcurl-errors(3)*](/man/os/curl/libcurl-errors.3). If [*CURLOPT\_ERRORBUFFER(3)*](/man/os/curl/CURLOPT_ERRORBUFFER.3) was set with [*curl\_easy\_setopt(3)*](/man/os/curl/curl_easy_setopt.3) there can be an error message stored in the error buffer when non-zero is returned.

# [SEE ALSO](#SEE_ALSO)

[**curl\_mime\_addpart**(3)](/man/os/curl/curl_mime_addpart.3), [**curl\_mime\_data\_cb**(3)](/man/os/curl/curl_mime_data_cb.3), [**curl\_mime\_name**(3)](/man/os/curl/curl_mime_name.3), [**curl\_mime\_type**(3)](/man/os/curl/curl_mime_type.3)

2026-10-19 libcurl

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Document: curl_mime_data(3) from curl 8.23.0-r1 (Chainguard OS)
Source: https://github.com/curl/curl.git