not sure if it will help, but your program and libcurl need to match for
some compilation settings.

#1 - you need to use the same CLR (runtime). If you use "multithreaded
debug dll" in your program, but libcurl is compiled with "multithreaded
debug" for instance, that will cause problems.

#2 - make sure that your exceptions and rtti settings in your program match
the settings you built libcurl with (although i think this will may cause
linker errors if this is wrong)

On Mon, Oct 10, 2011 at 5:12 PM, guillaume opalach <
guillaume_opalach_at_hotmail.com> wrote:

> Hello,
>
> I have a bug when I try to execute this code :
>
> ----------------------------------------------------
> #include <stdio.h>
> #include <curl/curl.h>
>
> int main(void)
> {
> CURL *curl;
> CURLcode res;
>
> curl_global_init(CURL_GLOBAL_ALL);
> curl = curl_easy_init();
> if(curl)
> {
> curl_easy_setopt(curl, CURLOPT_URL, "http://www.google.com/");
> res = curl_easy_perform(curl); // error is here
>
> /* always cleanup */
> curl_easy_cleanup(curl);
> }
> return 0;
> }
> ----------------------------------------------------
>
> The error message is the following :
>
> ----------------------------------------------------
> *Debug Assertion Failed !
> C:\...\testCurl.exe
> File: f\dd\vctools\crt_bld\self_x86\crt\dbgheap.c
> Line: 1322
>
> Expression: _CrtIsValidHeapPointer(pUserData)*
> ----------------------------------------------------
>
> I'm using Visual C++ 2010 on Windows 7. and I have curl-7.22.0
> I use my "own version" of the curl library, I follow a tutorial found
> somewhere on your website (I can't find the url again ><)
> I've open vc6curl.dsw and I build the LIB-RELEASE and the DLL-RELEASE.
> I copy the libcurl.dll and the libcurl.lib created into my project's
> directory.
> After that, on Visual I've done the following action (my visual is in
> french so I'll try to translate)
> 1 --
> - Right click on the project name
> - Properties
> - Configuration Properties
> - C/C++ (General)
> - Added the path to an include repertory with the curl header file.
> 2 --
> - Right click on the project name
> - Properties
> - Configuration Properties
> - C/C++
> - Preprocessor
> - Add the BUILDING_LIBCURL and HTTP_ONLY define
> (without this define, I can't make the .exe)
> 3 --
> - Right click on the project name
> - Properties
> - Configuration Properties
> - Linker (General)
> - In "repertory for additionnal library", I've add a path to the
> libcurl.lib
> 4 --
> - Right click on the project name
> - Properties
> - Configuration Properties
> - Linker
> - Entry (? maybe this traduction is wrong, it's the second menu, just under
> General)
> - Additionnal dependency -> I add libcurl.lib; ws2_32.lib; wldap32.lib
>
> That's all. I don't know what to do with the libcurl.dll, I've put it in
> the same directory than libcurl.lib.
> I can compile the project without any error, but when I run the executable,
> an error message (Debug insertion failed)
> I tried to compile the project in Release and not Debug, but I get another
> error message.
>
> So, when I execute this code in step by step, the error appear in this line
> :
> -- res = curl_easy_perform(curl);
> I've get in the cURL code to see what where the error happen :
>
> easy.c - function curl_easy_perform(CURL * curl) - Line 537 - return
> Curl_perform(data);
>
> transfer.c - function Curl_perform(struct SessionHandle *data) - Line 2261
> - return Curl_do_perform(data);
>
> transfer.c - function Curl_do_perform(struct SessionHandle *data) - Line
> 2115 - res = connect_host(data, &conn);
>
> transfer.c - static function connect_host(struct SessionHandle *data,
> struct connectdata **conn) - Line 1982 - res =
> Curl_resolver_wait_resolv(*conn, NULL);
>
> asyn-thread.c - function Curl_resolver_wait_resolv(struct connectdata
> *conn, struct Curl_dns_entry **entry) - Line 509 -
> destroy_async_data(&conn->async);
>
> asyn-thread.c - static function destroy_async_data (struct Curl_async
> *async) - Line 327 - free(async->hostname);
>
> I don't get deeper, because it's the function free, it's a system function
> and not a curl function.
> I really don't know why my code is not working but I think that, if the
> problem don't came from my code, there's only 3 option:
> - A problem with the libcurl.lib (wrong compilation?)
> - A problem with my Visual configuration (maybe I forget something?)
> - A bug in the curl code o_O ?
>
> I hope that someone can help me to solve this problem because I've really
> tried everything that I can.
>
> Best regard,
> --
> Guillaume
>
>
>
>
>
>
>
>
>
>
>
>
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Received on 2011-10-11