Thread: Asyncronous WinHttp

Hi all.

I'm not used with windows programming at all to begin with. I'm more used with curl. However. I got to use Windows API this time, and I'm trying to get a hang of WinHttp but obviously get something wrong.

I wrote a little piece of code to go through the logic I need, but it segfaults. Can someone be so nice and point out where I'm going wrong?

Code:

#include <stdio.h>
#include <assert.h>
#include <stdlib.h>

#include <windows.h>
#include <winhttp.h>

void http_callback(HINTERNET sess, DWORD_PTR ctx, DWORD sts, LPVOID info, DWORD infosz) {

	printf("Status: 0x%08x\n", sts);
	fflush(stdout);

}
int main(int argc, char **argv) {

	int r;
	HINTERNET sess;
	HINTERNET conn;
	HINTERNET requ;
	
	sess = WinHttpOpen(
		L"winhttp-test",
		WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
		WINHTTP_NO_PROXY_NAME,
		WINHTTP_NO_PROXY_BYPASS,
		WINHTTP_FLAG_ASYNC);
	assert(sess);

	r = (int) WinHttpSetStatusCallback(
		sess,
		(WINHTTP_STATUS_CALLBACK) http_callback,
		WINHTTP_CALLBACK_FLAG_ALL_NOTIFICATIONS,
		0);
	assert(r != -1);

	conn = WinHttpConnect(
		sess,
		L"www.google.com",
		INTERNET_DEFAULT_HTTPS_PORT,
		0);
	assert(conn);

	requ = WinHttpOpenRequest(
		conn,
		L"GET",
		L"/index.html",
		NULL,
		WINHTTP_NO_REFERER,
		WINHTTP_DEFAULT_ACCEPT_TYPES,
		WINHTTP_FLAG_SECURE);
	assert(requ);
	
	r = WinHttpSendRequest(
		requ,
		WINHTTP_NO_ADDITIONAL_HEADERS,
		0,
		NULL,
		0,
		0,
		0);

	assert(r);

	printf("Request sent!\n");

	Sleep(10000);

	return EXIT_SUCCESS;

}

The output of this program simply gets...

Code:

Status: 0x00000400

...and then it crashes.

Thanks.