Code :
hHCDev = CreateFileA(completeDeviceName,
//"F:\\test.txt",
GENERIC_WRITE|GENERIC_READ,
FILE_SHARE_WRITE|FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL);
if (hHCDev == INVALID_HANDLE_VALUE)
{
CloseHandle(hHCDev);
}
else
{
char bufRead[256] = {0};
DWORD countRead = 0;
BOOL result ;
result = ReadFile(hHCDev, bufRead, 5, &countRead, NULL) ;
if(!result)
{
printf("Reading file error %d\n", GetLastError());
}
char bufWrite[] = {'7', '8', '9', ' '};
DWORD countWritten = 0;
result = WriteFile(hHCDev, bufWrite, 3, &countWritten, NULL) ;
if(!result)
{
printf("Writing file error %d\n", GetLastError());
}
else
{
printf("sucess");
}
CloseHandle(hHCDev);
}
memset(completeDeviceName,0,256) ;
Description:
We tried to open the USB device connected using createfile(). Using Readfile and Writefile() calls we tried to communicate with the device. But these calls returned with error code 1. What might be the reason??
Your Help would be highly appreciated.
Best Regards
Suren
Try to run your application with administrator rights.
Related
I'm trying to use a PS3eye camera on Windows 10 with DirectShow sdk.
I've installed the driver and tested in AMCap that the PS3eye is working.
When in VS 2015, I defined a CCameraDS class with a function called CameraCount(), but when I call this function it always returns me 1 which represents the EasyCamera of my laptop. Am I missing something?
int CCameraDS::CameraCount()
{
int count = 0;
CoInitialize(NULL);
// enumerate all video capture devices
ICreateDevEnum *pCreateDevEnum = 0;
HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
IID_ICreateDevEnum, (void**)&pCreateDevEnum);
IEnumMoniker *pEm = 0;
hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEm, 0);
if (hr != NOERROR)
{
return count;
}
pEm->Reset();
ULONG cFetched;
IMoniker *pM;
while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK)
{
count++;
}
pCreateDevEnum = NULL;
pEm = NULL;
return count;
}
To verify, I have another method called CameraName(),
int CCameraDS::CameraName(int nCamID, char* sName, int nBufferSize)
{
int count = 0;
CoInitialize(NULL);
// enumerate all video capture devices
ICreateDevEnum *pCreateDevEnum = 0;
HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void**)&pCreateDevEnum);
IEnumMoniker *pEm = 0;
hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEm, 0);
if (hr != NOERROR) return 0;
pEm->Reset();
ULONG cFetched;
IMoniker *pM;
while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK)
{
if (count == nCamID)
{
IPropertyBag *pBag=0;
hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag);
if(SUCCEEDED(hr))
{
VARIANT var;
var.vt = VT_BSTR;
hr = pBag->Read(L"FriendlyName", &var, NULL);
if(hr == NOERROR)
{
WideCharToMultiByte(CP_ACP,0,var.bstrVal,-1,sName, nBufferSize ,"",NULL);
SysFreeString(var.bstrVal);
}
pBag->Release();
}
pM->Release();
break;
}
count++;
}
pCreateDevEnum = NULL;
pEm = NULL;
return 1;
}
When I input 0, I have EasyCamera returned, but input 1 with nothing output. Where is the problem?
Problem solved.
In fact, the PS3eye driver as well as AMCap software are both compiled under x86 environment, since I used x64 environment, the driver wasn't working I think.
I didn't expect this to be the solution but it does solve the problem.
I am getting status code 404 for the below code snippet.
Note: please add <HOSTNAME> when you are trying to figure out the issue.
HINTERNET m_hConnect;
HINTERNET m_hSession;
HINTERNET m_hRequest;
m_hSession = WinHttpOpen(userAgent,
WINHTTP_ACCESS_TYPE_NO_PROXY,
WINHTTP_NO_PROXY_NAME,
WINHTTP_NO_PROXY_BYPASS, 0);
if (!m_hSession) {
printf("WinHttpOpen:Error %d has occurred.",GetLastError());
return 0;
}
// connect to the IPP server on the given port
m_hConnect = WinHttpConnect( m_hSession, <HOSTNAME>, 443, 0);
if (!m_hConnect) {
printf("WinHttpConnect: Error %d has occurred.",GetLastError());
return 0;
}
// Create an HTTP Request handle.
m_hRequest = WinHttpOpenRequest(m_hConnect, L"POST" ,L"/ipp",
L"HTTP/1.1", WINHTTP_NO_REFERER,
WINHTTP_DEFAULT_ACCEPT_TYPES,WINHTTP_FLAG_SECURE);
if (!m_hRequest) {
printf("WinHttpOpenRequest:Error %d has occurred.",GetLastError());
return 0;
}
DWORD secureflags = SECURITY_FLAG_IGNORE_UNKNOWN_CA | SECURITY_FLAG_IGNORE_CERT_CN_INVALID |SECURITY_FLAG_IGNORE_CERT_WRONG_USAGE | SECURITY_FLAG_IGNORE_CERT_DATE_INVALID;
BOOL bResult= WinHttpSetOption(m_hRequest, WINHTTP_OPTION_SECURITY_FLAGS, (LPVOID)&secureflags, sizeof(secureflags));
if (!bResult) {
printf("WinHttpSetOption:Error %d has occurred.",GetLastError());
return 0;
}
bResult = WinHttpSendRequest(m_hRequest, WINHTTP_NO_ADDITIONAL_HEADERS,0,WINHTTP_NO_REQUEST_DATA,0,0,0);
if (!bResult) {
printf("WinHttpSendRequest:Error %d has occurred.",GetLastError());
return 0;
}
if( !WinHttpReceiveResponse( m_hRequest, NULL ) )
{
if( GetLastError( ) == ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED )
{
HCERTSTORE hMyStore = 0;
PCCERT_CONTEXT pCertContext = 0;
WCHAR szCertName[256]={0};
//MY is the store the certificate is in.
hMyStore = CertOpenSystemStore( 0, TEXT("MY") );
if( hMyStore )
{
pCertContext = CertFindCertificateInStore( hMyStore,
X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
0,
CERT_FIND_SUBJECT_STR,
(LPVOID) szCertName, //Subject string in the certificate.
NULL );
if( pCertContext )
{
WinHttpSetOption( m_hRequest,
WINHTTP_OPTION_CLIENT_CERT_CONTEXT,
(LPVOID) pCertContext,
sizeof(CERT_CONTEXT) );
CertFreeCertificateContext( pCertContext );
}
CertCloseStore( hMyStore, 0 );
// NOTE: Application should now resend the request.
bResult = WinHttpSendRequest(m_hRequest, WINHTTP_NO_ADDITIONAL_HEADERS,0,WINHTTP_NO_REQUEST_DATA,0,0,0);
if (!bResult) {
printf("WinHttpSendRequest:Error %d has occurred.",GetLastError());
return 0;
}
}
}
}
DWORD dwStatusCode = 0;
DWORD dwSize = sizeof(DWORD);
BOOL bResults = true;
bResults = WinHttpQueryHeaders( m_hRequest, WINHTTP_QUERY_STATUS_CODE | WINHTTP_QUERY_FLAG_NUMBER, NULL, &dwStatusCode, &dwSize, NULL );
Result: I am getting status code of 404. I am not able to figure out why it is happening.
Using WinINet, I have followed the same procedure, I am getting status code of 200, which is success. But my requirement is to use only WinHttp.
This is not a mystery. It is happening because the resource you request was not found.
Either:
The URL you used was incorrect, or
The mapping of URLs to resources at the server isn't correct.
EDIT:
Here's the complete code. modified the code to work with a router but the use case is same. Once i issue the password using libssh2_channel_write() subsequent libssh2_channel_read() fails with LIBSSH2_ERROR_SOCKET_RECV. Not sure why. I am unable to send subsequent commands to the remote device and get their output.
Logic was to execute a command on the remote device ( libssh2_channel_exec ). This command execution would throw a password to be entered by the client. Now read the stream via libssh2_channel_read() and ensure that the password is being asked and write the password to the channel via libssh2_channel_write(). Ensure the password is accepted on the remote device by doing subsequent reads [ THIS IS WHERE THE LIB IS FAILING WITH ERROR_SOCKET_RECV ] and then send the command to be executed via libssh2_channel_write() and read the command output. Am i missing something ?
for( ;; )
{
/* loop until we block */
int rc;
do
{
char buffer[0x4000];
rc = libssh2_channel_read( channel, buffer, sizeof(buffer) );
if( rc > 0 )
{
int i;
char *enable = "check-password\n";
int ret;
bytecount += rc;
fprintf(stderr, "We read [%d] bytes:\n", bytecount);
fputc('[', stderr);
for( i=0; i < rc; ++i )
fputc( buffer[i], stderr);
fputc(']', stderr);
if ( strstr(buffer, "Password:") != NULL ){
fprintf(stderr, "Sending the password now\n");
while((ret = libssh2_channel_write(channel, enable, strlen(enable))) == LIBSSH2_ERROR_EAGAIN) {
printf("ERROR_EAGAIN - sending password again\n");
}
fprintf(stderr, "Wrote [%d] bytes: \n", ret);
flag = 1;
continue;
}
if (!flag){ // start
char *cmd = "show clock\n";
int ret;
fprintf(stderr, "THIS Fetching show clock command now\n");
while((ret = libssh2_channel_write(channel, cmd, strlen(cmd))) == LIBSSH2_ERROR_EAGAIN) {
printf("ERROR_EAGAIN - sending show clock again\n");
}
flag = 1;
} // end
}
else {
if(rc != LIBSSH2_ERROR_EAGAIN)
fprintf(stderr, "libssh2_channel_read returned [%d]:\n ", rc);
}
}
while( rc > 0 );
/* this is due to blocking that would occur otherwise so we loop on
this condition */
if( rc == LIBSSH2_ERROR_EAGAIN )
{
int check;
check = waitsocket(sock, session);
}
else
break;
}
Here's my simple openssl client test case trying to connect to google.com:443.
According to the manual, BIO_do_connect should return 1, 0 or -1.
Google didn't find me anyone for whom it returns 0, which it does for me.
#include <stdio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
int main()
{
SSL_load_error_strings();
SSL_library_init();
ERR_load_BIO_strings();
OpenSSL_add_all_algorithms();
SSL_CTX *p_ssl_ctx = NULL;
SSL *p_ssl = NULL;
BIO * bio = NULL;
int r = 0;
// init ssl context
p_ssl_ctx = SSL_CTX_new(SSLv2_client_method()); /* Create new context */
if (p_ssl_ctx == NULL)
{
ERR_print_errors_fp(stderr);
return 3;
}
const char *store_path = "/etc/ssl/certs/ca-certificates.crt";
r = SSL_CTX_load_verify_locations(p_ssl_ctx, store_path, NULL);
if (r == 0) {
fprintf(stderr, "Unable to load the trust store from %s.\n", store_path);
return 4;
}
bio = BIO_new_ssl_connect(p_ssl_ctx);
if (!bio) {
fprintf(stderr, "no bio \n");
return 5;
}
BIO_get_ssl(bio, &p_ssl);
if (!(p_ssl)) {
fprintf(stderr, "no ssl\n");
return 6;
}
SSL_set_mode(p_ssl, SSL_MODE_AUTO_RETRY);
BIO_set_conn_hostname(bio, "www.google.com:443");
r = BIO_do_connect(bio);
if (r < 1) {
fprintf(stderr, "BIO_new_ssl_connect failed: %lu (0x%lx)\n", r, r);
fprintf(stderr, "Error: %s\n", ERR_reason_error_string(ERR_get_error()));
fprintf(stderr, "%s\n", ERR_error_string(ERR_get_error(), NULL));
ERR_print_errors_fp(stderr);
perror("bio");
return 7;
}
if (SSL_get_verify_result(p_ssl) != X509_V_OK) {
fprintf(stderr, "Unable to verify connection result.\n");
return 8;
}
return 0;
}
returns:
BIO_new_ssl_connect failed: 0 (0x0)
Error: (null)
error:00000000:lib(0):func(0):reason(0)
bio: Success
so how do i get the actual error out of this?
For getting the last state of your SSL connection in your code you can add something like fprintf(stderr,"p_ssl state: %s\n",SSL_state_string_long(p_ssl));.
More generally I suggest you to add an info callback like this : http://www.openssl.org/docs/ssl/SSL_CTX_set_info_callback.html
For your case, you must replace SSLv2_client_method() by something like TLSv1_client_method().
I just cann't seem to get the FFMpeg working with using the library. Everytime I try to convert asf file to wmv. I get the following issue on run time:
[wmv1 # 0x81ee000]error, slice code was 2
[wmv1 # 0x81ee000]header damaged
This my code:
static void audio_decode_example(const char *outfilename, const char *filename)
{
AVCodec *codec;
AVCodecContext *c= NULL;
int out_size, len, in_size;
FILE *f, *outfile;
uint8_t *outbuf;
uint8_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
AVPacket avpkt;
av_init_packet(&avpkt);
printf("Audio decoding\n");
/* find the mpeg audio decoder */
codec = avcodec_find_decoder(CODEC_ID_WMV1);
if (!codec) {
fprintf(stderr, "codec not found\n");
return;
}
c= avcodec_alloc_context2(CODEC_TYPE_AUDIO);
/* open it */
if (avcodec_open(c, codec) < 0) {
fprintf(stderr, "could not open codec\n");
return;
}
outbuf = malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE);
f = fopen(filename, "rb");
if (!f) {
fprintf(stderr, "could not open %s\n", filename);
return;
}
outfile = fopen(outfilename, "wb");
if (!outfile) {
av_free(c);
return;
}
/* decode until eof */
avpkt.data = inbuf;
len = avpkt.size = fread(inbuf, 1, INBUF_SIZE, f);
NSLog(#"%d", avpkt.size);
while (avpkt.size > 0) {
out_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
len = avcodec_decode_audio2(c, (short *)outbuf, &out_size, inbuf,len);// avpkt.size);
NSLog(#"%d", len);
if (len < 0) {
fprintf(stderr, "Error while decoding\n");
fclose(outfile);
return;
}
if (out_size > 0) {
/* if a frame has been decoded, output it */
fwrite(outbuf, 1, out_size, outfile);
}
avpkt.size -= len;
avpkt.data += len;
if (avpkt.size < AUDIO_REFILL_THRESH) {
/* Refill the input buffer, to avoid trying to decode
* incomplete frames. Instead of this, one could also use
* a parser, or use a proper container format through
* libavformat. */
memmove(inbuf, avpkt.data, avpkt.size);
avpkt.data = inbuf;
len = fread(avpkt.data + avpkt.size, 1,
INBUF_SIZE - avpkt.size, f);
if (len > 0)
avpkt.size += len;
}
}
fclose(outfile);
fclose(f);
free(outbuf);
avcodec_close(c);
av_free(c);
}
I have try the command line utilities and it successfully convert the file. Any help would be helpfully. thanks
Make the mistake of opening the wrong file