Passing Multiple params HttpPostRequest c++ - c++

Question

I have this function to send HTTP POST requests in C++, but i am having a little problem passing multiple strings arguments to it. Here's my code so far:
#include <Windows.h>
int doHttpPost(char *szDomain, char *szPage, char *szPost)
{
int iReturn = 1;
HINTERNET hSession = NULL;
HINTERNET hConnect = NULL;
HINTERNET hRequest = NULL;
static TCHAR hdrs[] = "Content-Type: application/x-www-form-urlencoded";
const char *accept[2]={"*/*", NULL};
TCHAR *frmdata = szPost;
hSession = InternetOpen("AGENT", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
if(hSession)
{
hConnect = InternetConnect(hSession, szDomain, INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1);
if(hConnect)
{
hRequest = HttpOpenRequest(hConnect, "POST", szPage, NULL, NULL, accept, INTERNET_FLAG_NO_CACHE_WRITE | INTERNET_FLAG_NO_COOKIES | INTERNET_FLAG_NO_UI | INTERNET_FLAG_RELOAD, 0);
if(hRequest)
{
if(HttpSendRequest(hRequest, hdrs, strlen(hdrs), frmdata, strlen(frmdata)))
iReturn = 0;
else
iReturn = 5;
}
else //HttpOpenRequest
iReturn = 3;
}
else //InternetConnect
iReturn = 2;
}
else //InternetOpen
iReturn = 1;
//Cleanup
InternetCloseHandle(hSession);
InternetCloseHandle(hConnect);
InternetCloseHandle(hRequest);
return iReturn;
}
I call the function this way:
doHttpPost((char*)"127.0.0.1",(char*)"/test/post.php",(char*)postreq);
Is there a way I can add multiple requests in the post field, such as:
value1=id&value2=password&value3=details
where id, password and details will be variables containing data.

Answer 1

You can build a string from parts using sprintf and friends.
The simplest code snippet, which however ignores escaping you need to do on the values, is as follows:
CHAR pszRequest[1024] = { 0 };
CHAR* pszValue1 = "id";
CHAR* pszValue2 = "password";
CHAR* pszValue3 = "details";
sprintf(pszRequest, "value1=%s&value2=%s&value3=%s",
pszValue1, pszValue2, pszValue3);
doHttpPost((char*) "127.0.0.1", (char*) "/test/post.php", pszRequest);
For a robust solution you need to read up on basic string manipulation functions, and check RFC that defines body format for "application/x-www-form-urlencoded" MIME type.