Is there any example that shows how to use FPDF_SaveAsCopy() function for saving PDF document ?
I can't find any examples anywhere !
I'm not familiarized with c++. But I can give you a C# example. So you can get an idea and convert it to c++.
string test_doc = "myTest.pdf";
FPDF_DOCUMENT doc = FPDF_LoadDocument(test_doc, NULL);
var stream = new FileStream(filename, FileMode.Create);
FPDF_SaveAsCopy(doc, stream, 0, 0);
public static bool FPDF_SaveAsCopy(FPDF_DOCUMENT document, Stream stream, SaveFlags flags, int version = 0)
{
byte[] buffer = null;
FPDF_FILEWRITE fileWrite = new FPDF_FILEWRITE((ignore, data, size) =>
{
if (buffer == null || buffer.Length < size)
buffer = new byte[size];
Marshal.Copy(data, buffer, 0, size);
stream.Write(buffer, 0, size);
return true;
});
if (version >= 10)
return FPDF_SaveWithVersion(document, fileWrite, flags, version);
else
return FPDF_SaveAsCopy(document, fileWrite, flags);
}
I hope this will help you any way.
Related
i using this code to encode video stream using vp8 and i decided to give vp9 a try so i changed every thing with starts with vp_* from 8 to 9.
but the vp9 encoder always return a null packet although the encoder doesn't return any error.
here is the code i'am using for configuring.
vpx_codec_err_t error = vpx_codec_enc_config_default(vpx_codec_vp9_cx(), &enc_cfg, 0);
if(error != VPX_CODEC_OK)
return error;
enc_cfg.g_timebase.den = fps;
enc_cfg.rc_undershoot_pct = 95;
enc_cfg.rc_target_bitrate = bitrate;
enc_cfg.g_error_resilient = 1;
enc_cfg.kf_max_dist = 999999;
enc_cfg.rc_buf_initial_sz = 4000;
enc_cfg.rc_buf_sz = 6000;
enc_cfg.rc_buf_optimal_sz = 5000;
enc_cfg.rc_end_usage = VPX_CBR;
enc_cfg.g_h = height;
enc_cfg.g_w = width;
enc_cfg.rc_min_quantizer = 4;
enc_cfg.rc_max_quantizer = 56;
enc_cfg.g_threads = 4;
enc_cfg.g_pass = VPX_RC_ONE_PASS;
error = vpx_codec_enc_init(&codec, vpx_codec_vp9_cx(), &enc_cfg, 0);
if(error != VPX_CODEC_OK)
return error;
vpx_img_alloc(&vpx_image,VPX_IMG_FMT_I420 , width, height, 1);
configured = true;
return VPX_CODEC_OK;
and the code for the encoding
libyuv::RAWToI420(frame, vpx_image.d_w * 3, vpx_image.planes[VPX_PLANE_Y],vpx_image.stride[VPX_PLANE_Y],
vpx_image.planes[VPX_PLANE_U], vpx_image.stride[VPX_PLANE_U], vpx_image.planes[VPX_PLANE_V],
vpx_image.stride[VPX_PLANE_V], vpx_image.d_w, vpx_image.d_h);
const vpx_codec_cx_pkt_t *pkt;
vpx_codec_err_t error = vpx_codec_encode(&codec, &vpx_image, 0, 1, 0, VPX_DL_GOOD_QUALITY);
if(error != VPX_CODEC_OK)
return vector<byte>();
vpx_codec_iter_t iter = NULL;
if((pkt = vpx_codec_get_cx_data(&codec, &iter)))//always return null ?
{
if(pkt->kind == VPX_CODEC_CX_FRAME_PKT)
{
int length = pkt->data.frame.sz;
byte* buf = (byte*) pkt->data.frame.buf;
vector<byte> data(buf, buf + length);
return data;
}
return vector<byte>();
}
return vector<byte>();
the code is fully working if i'am using vp8 instead of 9, any help is welcomed
Just came across this post because I faced the same problem. Just for other to know: I solved it with setting
enc_cfg.g_lag_in_frames = 0;
This basically disallows the encoder to consume up to default 25 frames until it produces any output.
I have an application that tries to verify the mmc.exe (services) signature. (the context of the application I think is irrelevant) I am trying with winapi function which both fails with
WinVerifyTrust. I get TRUST_E_BAD_DIGEST when I am trying with verification from catalog, and
TRUST_E_NOSIGNATURE when trying from file info. it is very important to mention that my function succeeds on win7, XP but fails on win8.
this is the code snippet for the function
CATALOG_INFO InfoStruct = {0};
InfoStruct.cbStruct = sizeof(CATALOG_INFO);
WINTRUST_CATALOG_INFO WintrustCatalogStructure = {0};
WintrustCatalogStructure.cbStruct = sizeof(WINTRUST_CATALOG_INFO);
WINTRUST_FILE_INFO WintrustFileStructure = {0};
WintrustFileStructure.cbStruct = sizeof(WINTRUST_FILE_INFO);
GUID ActionGuid = WINTRUST_ACTION_GENERIC_VERIFY_V2;
//Get a context for signature verification.
HCATADMIN Context = NULL;
if(!::CryptCATAdminAcquireContext(&Context, NULL, 0) ){
return false;
}
//Open file.
cx_handle hFile(::CreateFileW(filename_.c_str(), GENERIC_READ, 7, NULL, OPEN_EXISTING, 0, NULL));
if( INVALID_HANDLE_VALUE == (HANDLE)hFile )
{
CryptCATAdminReleaseContext(Context, 0);
return false;
}
//Get the size we need for our hash.
DWORD HashSize = 0;
::CryptCATAdminCalcHashFromFileHandle(hFile, &HashSize, NULL, 0);
if( HashSize == 0 )
{
//0-sized has means error!
::CryptCATAdminReleaseContext(Context, 0);
return false;
}
//Allocate memory.
buffer hashbuf(HashSize);
//Actually calculate the hash
if( !CryptCATAdminCalcHashFromFileHandle(hFile, &HashSize, hashbuf.data, 0) )
{
CryptCATAdminReleaseContext(Context, 0);
return false;
}
//Convert the hash to a string.
buffer MemberTag(((HashSize * 2) + 1) * sizeof(wchar_t));
for( unsigned int i = 0; i < HashSize; i++ ){
swprintf(&((PWCHAR)MemberTag.data)[i * 2], L"%02X", hashbuf.data[i ]);
}
//Get catalog for our context.
HCATINFO CatalogContext = CryptCATAdminEnumCatalogFromHash(Context, hashbuf, HashSize, 0, NULL);
if ( CatalogContext )
{
//If we couldn't get information
if ( !CryptCATCatalogInfoFromContext(CatalogContext, &InfoStruct, 0) )
{
//Release the context and set the context to null so it gets picked up below.
CryptCATAdminReleaseCatalogContext(Context, CatalogContext, 0);
CatalogContext = NULL;
}
}
//If we have a valid context, we got our info.
//Otherwise, we attempt to verify the internal signature.
WINTRUST_DATA WintrustStructure = {0};
WintrustStructure.cbStruct = sizeof(WINTRUST_DATA);
if( !CatalogContext )
{
load_signature_verification_from_file_info(WintrustFileStructure, WintrustStructure);
}
else
{
load_signature_verification_from_catalog(WintrustStructure, WintrustCatalogStructure, InfoStruct, MemberTag);
}
//Call our verification function.
long verification_res = ::WinVerifyTrust(0, &ActionGuid, &WintrustStructure);
//Check return.
bool is_success = SUCCEEDED(verification_res) ? true : false;
// if failed with CatalogContext, try with FILE_INFO
if(!is_success && CatalogContext && verification_res != TRUST_E_NOSIGNATURE)
{
//warning2(L"Failed verification with Catalog Context: 0x%x %s ; Retrying with FILE_INFO.", verification_res, (const wchar_t*)format_last_error(verification_res));
load_signature_verification_from_file_info(WintrustFileStructure, WintrustStructure);
verification_res = ::WinVerifyTrust(0, &ActionGuid, &WintrustStructure);
is_success = SUCCEEDED(verification_res) ? true : false;
}
if(perr && !is_success && verification_res != TRUST_E_NOSIGNATURE)
{
perr->code = verification_res;
perr->description = format_last_error(verification_res);
}
//Free context.
if( CatalogContext ){
::CryptCATAdminReleaseCatalogContext(Context, CatalogContext, 0);
}
//If we successfully verified, we need to free.
if( is_success )
{
WintrustStructure.dwStateAction = WTD_STATEACTION_CLOSE;
::WinVerifyTrust(0, &ActionGuid, &WintrustStructure);
}
::CryptCATAdminReleaseContext(Context, 0);
return is_success;
I don't think any thing had changed in this function from win7 to win 8 so what could possibly go wrong?
UPDATE
I did notice that my function does work for task manager at win 8.
but again for the mmc it does not work.
It appears that your general approach is correct and the functions themselves haven't changed. However there are subtle changes; namely the data on which they operate has changed. The hashes stored for files on Windows 8, according to comments on CryptCATAdminCalcHashFromFileHandle, are calculated using SHA-256 hashes.
The SHA-256 hashing algorithm is not supported by CryptCATAdminCalcHashFromFileHandle, so you must update the code to use CryptCATAdminAcquireContext2 and CryptCATAdminCalcHashFromFileHandle2 on Windows 8; the former allows you to acquire a HCATADMIN with a specified hash algorithm, and the latter allows using that HCATADMIN.
(Interestingly, WINTRUST_CATALOG_INFO also points this direction with its HCATADMIN hCatAdmin member, documented as "Windows 8 and Windows Server 2012: Support for this member begins.")
Does anyone know how can I hash the user's password using the salt key provided by the ASP .NET Membership?
I'm developing a C++ Linux application and I have only access to the SQL Server.
Thanks,
Here is the encoding algorithm used by ASP.Net Membership which is written in C#.
It uses System.Security, so you might want to look at MONO if you want to run on Lunix.
Note: I'm not familiar with MONO.
private string EncodePassword(string pass, int passwordFormat, string salt)
{
if (passwordFormat == 0) // MembershipPasswordFormat.Clear
return pass;
byte[] bIn = Encoding.Unicode.GetBytes(pass);
byte[] bSalt = Convert.FromBase64String(salt);
byte[] bRet = null;
if (passwordFormat == 1)
{ // MembershipPasswordFormat.Hashed
HashAlgorithm hm = GetHashAlgorithm();
if (hm is KeyedHashAlgorithm)
{
KeyedHashAlgorithm kha = (KeyedHashAlgorithm)hm;
if (kha.Key.Length == bSalt.Length)
{
kha.Key = bSalt;
}
else if (kha.Key.Length < bSalt.Length)
{
byte[] bKey = new byte[kha.Key.Length];
Buffer.BlockCopy(bSalt, 0, bKey, 0, bKey.Length);
kha.Key = bKey;
}
else
{
byte[] bKey = new byte[kha.Key.Length];
for (int iter = 0; iter < bKey.Length; )
{
int len = Math.Min(bSalt.Length, bKey.Length - iter);
Buffer.BlockCopy(bSalt, 0, bKey, iter, len);
iter += len;
}
kha.Key = bKey;
}
bRet = kha.ComputeHash(bIn);
}
else
{
byte[] bAll = new byte[bSalt.Length + bIn.Length];
Buffer.BlockCopy(bSalt, 0, bAll, 0, bSalt.Length);
Buffer.BlockCopy(bIn, 0, bAll, bSalt.Length, bIn.Length);
bRet = hm.ComputeHash(bAll);
}
}
else
{
byte[] bAll = new byte[bSalt.Length + bIn.Length];
Buffer.BlockCopy(bSalt, 0, bAll, 0, bSalt.Length);
Buffer.BlockCopy(bIn, 0, bAll, bSalt.Length, bIn.Length);
bRet = EncryptPassword(bAll, _LegacyPasswordCompatibilityMode);
}
return Convert.ToBase64String(bRet);
}
private string GenerateSalt()
{
byte[] buf = new byte[SALT_SIZE];
(new RNGCryptoServiceProvider()).GetBytes(buf);
return Convert.ToBase64String(buf);
}
I've been trying to write a class that derives from FramedSource in Live555 that will allow me to stream live data from my D3D9 application to an MP4 or similar.
What I do each frame is grab the backbuffer into system memory as a texture, then convert it from RGB -> YUV420P, then encode it using x264, then ideally pass the NAL packets on to Live555. I made a class called H264FramedSource that derived from FramedSource basically by copying the DeviceSource file. Instead of the input being an input file, I've made it a NAL packet which I update each frame.
I'm quite new to codecs and streaming, so I could be doing everything completely wrong. In each doGetNextFrame() should I be grabbing the NAL packet and doing something like
memcpy(fTo, nal->p_payload, nal->i_payload)
I assume that the payload is my frame data in bytes? If anybody has an example of a class they derived from FramedSource that might at least be close to what I'm trying to do I would love to see it, this is all new to me and a little tricky to figure out what's happening. Live555's documentation is pretty much the code itself which doesn't exactly make it easy for me to figure out.
Ok, I finally got some time to spend on this and got it working! I'm sure there are others who will be begging to know how to do it so here it is.
You will need your own FramedSource to take each frame, encode, and prepare it for streaming, I will provide some of the source code for this soon.
Essentially throw your FramedSource into the H264VideoStreamDiscreteFramer, then throw this into the H264RTPSink. Something like this
scheduler = BasicTaskScheduler::createNew();
env = BasicUsageEnvironment::createNew(*scheduler);
framedSource = H264FramedSource::createNew(*env, 0,0);
h264VideoStreamDiscreteFramer
= H264VideoStreamDiscreteFramer::createNew(*env, framedSource);
// initialise the RTP Sink stuff here, look at
// testH264VideoStreamer.cpp to find out how
videoSink->startPlaying(*h264VideoStreamDiscreteFramer, NULL, videoSink);
env->taskScheduler().doEventLoop();
Now in your main render loop, throw over your backbuffer which you've saved to system memory to your FramedSource so it can be encoded etc. For more info on how to setup the encoding stuff check out this answer How does one encode a series of images into H264 using the x264 C API?
My implementation is very much in a hacky state and is yet to be optimised at all, my d3d application runs at around 15fps due to the encoding, ouch, so I will have to look into this. But for all intents and purposes this StackOverflow question is answered because I was mostly after how to stream it. I hope this helps other people.
As for my FramedSource it looks a little something like this
concurrent_queue<x264_nal_t> m_queue;
SwsContext* convertCtx;
x264_param_t param;
x264_t* encoder;
x264_picture_t pic_in, pic_out;
EventTriggerId H264FramedSource::eventTriggerId = 0;
unsigned H264FramedSource::FrameSize = 0;
unsigned H264FramedSource::referenceCount = 0;
int W = 720;
int H = 960;
H264FramedSource* H264FramedSource::createNew(UsageEnvironment& env,
unsigned preferredFrameSize,
unsigned playTimePerFrame)
{
return new H264FramedSource(env, preferredFrameSize, playTimePerFrame);
}
H264FramedSource::H264FramedSource(UsageEnvironment& env,
unsigned preferredFrameSize,
unsigned playTimePerFrame)
: FramedSource(env),
fPreferredFrameSize(fMaxSize),
fPlayTimePerFrame(playTimePerFrame),
fLastPlayTime(0),
fCurIndex(0)
{
if (referenceCount == 0)
{
}
++referenceCount;
x264_param_default_preset(¶m, "veryfast", "zerolatency");
param.i_threads = 1;
param.i_width = 720;
param.i_height = 960;
param.i_fps_num = 60;
param.i_fps_den = 1;
// Intra refres:
param.i_keyint_max = 60;
param.b_intra_refresh = 1;
//Rate control:
param.rc.i_rc_method = X264_RC_CRF;
param.rc.f_rf_constant = 25;
param.rc.f_rf_constant_max = 35;
param.i_sps_id = 7;
//For streaming:
param.b_repeat_headers = 1;
param.b_annexb = 1;
x264_param_apply_profile(¶m, "baseline");
encoder = x264_encoder_open(¶m);
pic_in.i_type = X264_TYPE_AUTO;
pic_in.i_qpplus1 = 0;
pic_in.img.i_csp = X264_CSP_I420;
pic_in.img.i_plane = 3;
x264_picture_alloc(&pic_in, X264_CSP_I420, 720, 920);
convertCtx = sws_getContext(720, 960, PIX_FMT_RGB24, 720, 760, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
if (eventTriggerId == 0)
{
eventTriggerId = envir().taskScheduler().createEventTrigger(deliverFrame0);
}
}
H264FramedSource::~H264FramedSource()
{
--referenceCount;
if (referenceCount == 0)
{
// Reclaim our 'event trigger'
envir().taskScheduler().deleteEventTrigger(eventTriggerId);
eventTriggerId = 0;
}
}
void H264FramedSource::AddToBuffer(uint8_t* buf, int surfaceSizeInBytes)
{
uint8_t* surfaceData = (new uint8_t[surfaceSizeInBytes]);
memcpy(surfaceData, buf, surfaceSizeInBytes);
int srcstride = W*3;
sws_scale(convertCtx, &surfaceData, &srcstride,0, H, pic_in.img.plane, pic_in.img.i_stride);
x264_nal_t* nals = NULL;
int i_nals = 0;
int frame_size = -1;
frame_size = x264_encoder_encode(encoder, &nals, &i_nals, &pic_in, &pic_out);
static bool finished = false;
if (frame_size >= 0)
{
static bool alreadydone = false;
if(!alreadydone)
{
x264_encoder_headers(encoder, &nals, &i_nals);
alreadydone = true;
}
for(int i = 0; i < i_nals; ++i)
{
m_queue.push(nals[i]);
}
}
delete [] surfaceData;
surfaceData = NULL;
envir().taskScheduler().triggerEvent(eventTriggerId, this);
}
void H264FramedSource::doGetNextFrame()
{
deliverFrame();
}
void H264FramedSource::deliverFrame0(void* clientData)
{
((H264FramedSource*)clientData)->deliverFrame();
}
void H264FramedSource::deliverFrame()
{
x264_nal_t nalToDeliver;
if (fPlayTimePerFrame > 0 && fPreferredFrameSize > 0) {
if (fPresentationTime.tv_sec == 0 && fPresentationTime.tv_usec == 0) {
// This is the first frame, so use the current time:
gettimeofday(&fPresentationTime, NULL);
} else {
// Increment by the play time of the previous data:
unsigned uSeconds = fPresentationTime.tv_usec + fLastPlayTime;
fPresentationTime.tv_sec += uSeconds/1000000;
fPresentationTime.tv_usec = uSeconds%1000000;
}
// Remember the play time of this data:
fLastPlayTime = (fPlayTimePerFrame*fFrameSize)/fPreferredFrameSize;
fDurationInMicroseconds = fLastPlayTime;
} else {
// We don't know a specific play time duration for this data,
// so just record the current time as being the 'presentation time':
gettimeofday(&fPresentationTime, NULL);
}
if(!m_queue.empty())
{
m_queue.wait_and_pop(nalToDeliver);
uint8_t* newFrameDataStart = (uint8_t*)0xD15EA5E;
newFrameDataStart = (uint8_t*)(nalToDeliver.p_payload);
unsigned newFrameSize = nalToDeliver.i_payload;
// Deliver the data here:
if (newFrameSize > fMaxSize) {
fFrameSize = fMaxSize;
fNumTruncatedBytes = newFrameSize - fMaxSize;
}
else {
fFrameSize = newFrameSize;
}
memcpy(fTo, nalToDeliver.p_payload, nalToDeliver.i_payload);
FramedSource::afterGetting(this);
}
}
Oh and for those who want to know what my concurrent queue is, here it is, and it works brilliantly http://www.justsoftwaresolutions.co.uk/threading/implementing-a-thread-safe-queue-using-condition-variables.html
Enjoy and good luck!
The deliverFrame method lacks the following check at its start:
if (!isCurrentlyAwaitingData()) return;
see DeviceSource.cpp in LIVE
I am using Silverlight4 with java webervices in jsp page. I want to save an image to the server so trying to do this with java webservice. I am using below lines of code but output is damaged. I dont understand why. Please help me. This is really important for me. When i try to open 3mb jpeg file contains "Windows Photo Viewer cant open this picture because file appears to be damaged, corrupted or is too large."
Client Side COde
WriteableBitmap wb = new WriteableBitmap(bitmapImage);
byte[] bb = ToByteArray(wb);
public byte[] ToByteArray(WriteableBitmap bmp)
{
int[] p = bmp.Pixels;
int len = p.Length * 4;
byte[] result = new byte[len]; // ARGB
Buffer.BlockCopy(p, 0, result, 0, len);
return result;
}
WebService Code
#WebMethod(operationName = "saveImage")
public Boolean saveImage(#WebParam(name = "img")
byte[] img, #WebParam(name = "path")
String path) {
try{
FileOutputStream fos = new FileOutputStream("C:\\Users\\TheIntersect\\Desktop\\sharp_serializer_dll\\saved.jpg");
fos.write(img);
fos.close();
return true;
}
catch(Exception e){
return false;
}
}
I found my answer on forums.silverlight.net
It is very interesting when i try to call ReadFully(Stream) just after the Stream definition it works but when i call 10 lines of code later it returns all 0.
FUnction
public static byte[] ReadFully(Stream input)
{
byte[] buffer = new byte[input.Length];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms.ToArray();
}
}
Fail Code
using (Stream str = opd.File.OpenRead())
{
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.SetSource(str);
image.Tag = bitmapImage.UriSource.ToString();
image.Source = bitmapImage;
image.Width = width;
image.Height = height;
image.Stretch = Stretch.Uniform;
container.Child = image;
rtb.Selection.Insert(container);
ServiceReference1.webWordWebServiceClient s = new ServiceReference1.webWordWebServiceClient();
byte[] bb = ReadFully(str);
s.saveImageCompleted += new EventHandler<ServiceReference1.saveImageCompletedEventArgs>(s_saveImageCompleted);
s.saveImageAsync(bb, "gungorrrr");
}
Successfull Code
using (Stream str = opd.File.OpenRead())
{
byte[] bb = ReadFully(str);
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.SetSource(str);
image.Tag = bitmapImage.UriSource.ToString();
image.Source = bitmapImage;
image.Width = width;
image.Height = height;
image.Stretch = Stretch.Uniform;
container.Child = image;
rtb.Selection.Insert(container);
ServiceReference1.webWordWebServiceClient s = new ServiceReference1.webWordWebServiceClient();
(bitmapImage);
s.saveImageCompleted += new EventHandler<ServiceReference1.saveImageCompletedEventArgs>(s_saveImageCompleted);
s.saveImageAsync(bb, "gungorrrr");
}
Link: http://forums.silverlight.net/forums/p/234126/576070.aspx#576070