HttpOpenRequest brings up error 122: ERROR_INSUFFICIENT_BUFFER (no url limit problems, just default params)

[Daniel Kondermann]

Hi there!

According to the Platform SDK these calls shouldn't do any harm:

HINTERNET m_hInternet = InternetOpen(Agent.c_str(),
PRE_CONFIG_INTERNET_ACCESS, NULL, 0, 0);

HINTERNET m_hConnection =InternetConnect(
m_hInternet, Server.c_str(), Port, NULL /*username*/, NULL
/*password*/,
INTERNET_SERVICE_HTTP, 0, 0);

DWORD err =GetLastError(); //returns "no error"

HINTERNET m_hRequest =HttpOpenRequest(m_hConnection, NULL,
"/guard/guard.php\0",
NULL, "192.168.0.1\0", NULL, INTERNET_FLAG_RELOAD, 0);

err =GetLastError(); //returns Error 122: ERROR_INSUFFICIENT_BUFFER

Unfortunately I have no clue why the call to HttpOpenRequest returns
that error since I don't use any buffers. And m_hRequest is not NULL,
so it should be a correct handle. Anyway all subsequent calls will
fail with an "invalid handle" error.
Anyway the Platform SDK doesn't mention that this error can occur :(

I'd very much appreciate your help!
...theres not much info about this stuff in the web...
Daniel

[Stephen Sulzer]

In Win32 API programming, you don't check GetLastError unless the Win32 API
that you called indicated that it failed (usually by returning FALSE or a
NULL handle). So if HttpOpenRequest is returning a non-NULL request handle
then HttpOpenRequest succeeded and GetLastError is irrelevant.

- Stephen

Post by Daniel Kondermann
Hi there!
HINTERNET m_hInternet = InternetOpen(Agent.c_str(),
PRE_CONFIG_INTERNET_ACCESS, NULL, 0, 0);
HINTERNET m_hConnection =InternetConnect(
m_hInternet, Server.c_str(), Port, NULL /*username*/, NULL
/*password*/,
INTERNET_SERVICE_HTTP, 0, 0);
DWORD err =GetLastError(); //returns "no error"
HINTERNET m_hRequest =HttpOpenRequest(m_hConnection, NULL,
"/guard/guard.php\0",
NULL, "192.168.0.1\0", NULL, INTERNET_FLAG_RELOAD, 0);
err =GetLastError(); //returns Error 122: ERROR_INSUFFICIENT_BUFFER
Unfortunately I have no clue why the call to HttpOpenRequest returns
that error since I don't use any buffers. And m_hRequest is not NULL,
so it should be a correct handle. Anyway all subsequent calls will
fail with an "invalid handle" error.
Anyway the Platform SDK doesn't mention that this error can occur :(
I'd very much appreciate your help!
...theres not much info about this stuff in the web...
Daniel

[Daniel Kondermann]

Thanks for your fast reply!
The reason for my question is that in the following line of code:

if(!HttpSendRequest(m_hRequest, NULL, 0, NULL, 0)) {
err =GetLastError(); //returns 6: "Invalid Handle"
}

I get an "Invalid Handle" error. Thus it seems like the first call
failed even though it returned a handle different from NULL.
What am I doing wrong?

Thanks again,
Daniel

Post by Daniel Kondermann
HINTERNET m_hInternet = InternetOpen(Agent.c_str(),
PRE_CONFIG_INTERNET_ACCESS, NULL, 0, 0);
HINTERNET m_hConnection =InternetConnect(
m_hInternet, Server.c_str(), Port, NULL /*username*/, NULL
/*password*/,
INTERNET_SERVICE_HTTP, 0, 0);
DWORD err =GetLastError(); //returns "no error"
HINTERNET m_hRequest =HttpOpenRequest(m_hConnection, NULL,
"/guard/guard.php\0",
NULL, "192.168.0.1\0", NULL, INTERNET_FLAG_RELOAD, 0);
err =GetLastError(); //returns Error 122: ERROR_INSUFFICIENT_BUFFER