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added read callback function in order to prevent crashs on Win32 when linked against DLL:

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This commit is contained in:
Gunter Knauf 2008-02-20 12:33:45 +00:00
parent e6170eb20d
commit d208e56b16
1 changed files with 19 additions and 6 deletions
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25
docs/examples/ftpupload.c
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@ -32,6 +32,22 @@
#define REMOTE_URL "ftp://localhost/" UPLOAD_FILE_AS
#define RENAME_FILE_TO "renamed-and-fine.txt"
/* NOTE: if you want this example to work on Windows with libcurl as a
DLL, you MUST also provide a read callback with
CURLOPT_READFUNCTION. Failing to do so will give you a crash since a
DLL may not use the variable's memory when passed in to it from an app
like this. */
static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
{
/* in real-world cases, this would probably get this data differently
as this fread() stuff is exactly what the library already would do
by default internally */
size_t retcode = fread(ptr, size, nmemb, stream);
fprintf(stderr, "*** We read %d bytes from file\n", retcode);
return retcode;
}
int main(int argc, char **argv)
{
CURL *curl;
@ -63,6 +79,9 @@ int main(int argc, char **argv)
headerlist = curl_slist_append(headerlist, buf_1);
headerlist = curl_slist_append(headerlist, buf_2);
/* we want to use our own read function */
curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
/* enable uploading */
curl_easy_setopt(curl, CURLOPT_UPLOAD, 1) ;
@ -75,12 +94,6 @@ int main(int argc, char **argv)
/* now specify which file to upload */
curl_easy_setopt(curl, CURLOPT_READDATA, hd_src);
/* NOTE: if you want this example to work on Windows with libcurl as a
DLL, you MUST also provide a read callback with
CURLOPT_READFUNCTION. Failing to do so will give you a crash since a
DLL may not use the variable's memory when passed in to it from an app
like this. */
/* Set the size of the file to upload (optional). If you give a *_LARGE
option you MUST make sure that the type of the passed-in argument is a
curl_off_t. If you use CURLOPT_INFILESIZE (without _LARGE) you must