I want to store videos and images in c++ files. Can we store data other than text in c++ files. Like images, and videos.
Yes. If you install any picture onto your computer, you can just change the file extension to cpp. The file type is a C++ file, however, if you attempt to read the file it will of course be corrupted and not really make sense.
Changing the extension back to .png or .jpg will restore the image file back to its former glory.
Related
Sorry for making such an unclear title
I have a disk image disk.raw from which I carved deleted files using Sleuth Kit and its command blkls disk.raw 1-8000 > carved which put into a file the data in the unallocated blocks from 1 to 8000 (where I know my deleted files are)
So my output is a file containing some data and many empty spaces in between. For example, if I open it on a notepad, I get texts like these :
1 4 µ½;ÓóÆJv4éA°¿S*îÔy÷è„¡d:ÄÕԈȤÒX2ÛK]8øâ†+[ÛÖ7jiº;Îàdƒ”ÜRÒ€
¥¾‘…λ5y)‹F¹ž8rÀÉø±9ŸÎ:ÿf¤$cªW›
jȉ…j,ܬ3®°d¥²¥®:Þ FhãŽß[ÔÀZ
÷·Îâ#§B¢† Uƒ†=qÁ[е#Sy(JØš#œKÊÏ9êþáð0•›nÊÑ=q¡ŽšOk'ë#ëÚšÚjN1V&l?Hù´m,0㼕(nôTúèªÎb4z
„áñP$¼YèÐ%É‚YSÄÔΔú%ió΃P¥ð"÷…ž8«¾oÀE‚f¤X§üS(‘Àº.8H§÷ëü1¥ãùBÁ
ÏÉε”˜Ê<wªf”œàºš¯+kô¨§
÷*ÎÛMøÈ”Âqú2>XME[9¿
[æÀ‹dJ¹—×™
#¦e³ž‹
&ýãY
™qA›¥ì„5šI‰h{?–hZ%"?mÓ{ƒÌ‡5mf
R‹sàì‰;½˜\E€Îñ$‡jYÀK%ØnDwí[=û Ú‘;1„LQP!ðè.¦(w
‘ªb,†ä‚ž8®©8¢BMMã×›Œx
£®‘ÚFëÖбgi·ÖŠ.O&ÂëR¹5–{íy˜÷æ¡žÜç¦^ñbj˜1Úî5G)©Äš¸#¡
? qâ1q[µ£É>½¥f–#žÞPžR›#T3lÂ.DcSÚ˥ѹ‹e¬·!$ù“àYž{¨Ü˜ÉbJ…8¬‘#"b 3Ø„¤Í
qµ~#©Á42û,èLE²‰Iv+Áƒ™MšÅÄ
$Bn×ÖXya1£²ŒJçj-Õ7 :AÚ0è#eP#sef}#NÈè?¸¯ãß8µ#Q?ÒY͆ۡ)†ë3F›Œ[ŽF®8©!PóÚª]p [íˆyÊn;ãÕ§rBvÏŸ`‚ȨŠöMë÷S¸50¦è€\¾i'7ÒÚTT•vˆ›™¸ë‹ƒÞS>ðºjû&]WÆ–˜ÚÔG•5ÚÑÎ¥Vñ`;´0æ6\wuo«íîÕµ¬t–‚Âþ‘)ü¨Òíi¼_¡•o_iùab›,âezkM#Þæ]–h6Š¨+S$"4”4^ÞóD*í£0Ìmk¼#G•¨pG‡Ï{∉ŒB™ƒ)1Y¸E1<1¼
S’5éà‚z[A¬TD‰·Ý¾é m2ËTÍÌšÛrvF€Â«j¤ô?ÿþ¢Zh4œ6<劕n´öñ>ï9Ì}
I know that those bunch of data represents a compressed file. Is there a way for me to decode these and read the files inside ? Is there a tool that does that given this previous input ?
I'm really new to this and have basic knowledge :)
Thank you kindly in advance,
Sometimes carved files lose their headers format, repairing it might lead to the file being accessible again. As mentioned by Mark Setchell using a hex editor is better than a notepad. Make sure also to look for the correct header and save the file again with the correct format. Hopefully this is helpful.
I am creating a pdf using libharu in C++ (compiled as a .cgi) that features .png images.
The code is fine, but my pdf's are ridiculously oversized.
Each page features one image of around 30kb and around 4 text characters in libharu's system font. If I open a 20 page output file of 25mb and "print" it to a file in my operating system it becomes 256kb or so with no visible change to the images.
I think the issue is related to libharu because this guy see's it too, here. He is using php so, libharu as a compiled .cgi. (my C++ code is also compiled .cgi, linked to libharu).
Another guy here on stack overflow has also seen size issues with libharu, but his problem does not mention anything to do with .png so it may be unrelated.
Code for reference:
WorkingGraphic = HPDF_LoadPngImageFromMem ( *gPdfPtr,
PngAssets[AssetIndex], //Image data ptr
PngSizes[AssetIndex]); //data length
//Render Appropriate
HPDF_Page_DrawImage (*BlitParams->page,
WorkingGraphic,
BlitParams->OutputRect->X,
BlitParams->OutputRect->Y,
BlitParams->OutputRect->Width,
BlitParams->OutputRect->Height);
Does anyone know how to drive libharu so it creates sensible sized pdf's when you use .png images?
Right I don't know how to remove a question but maybe this info will be useful to others anyway.
I may have had the same issue as this fellow here where I have duplicated this answer.
What I needed to do was enable compression of the .pdf, which I had not done.
Documentation link
C Code:
HPDF_SetCompressionMode (pdf, HPDF_COMP_ALL);
It's because I didn't do enough research to know that .pdf format does not natively support .png, or if it has been updated to do so, libharu still doesn't. So, this option tells libharu to use zlib to zip compress everything it can, including your images.
The implementation is not perfect (you will still see a size difference if you zip your output .pdf) but it is acceptable for my use case.
If you don't need the full-size image in the PDF, you can reduce the image to a thumbnail using GDI+ APIs, equal in size to however big you want the image to appear in the PDF.
Save the scaled PNG to a temporary file, and pass the thumbnail PNG to Haru PDF. This will reduce the size of the PDF file.
The image will be pixellated when the viewer zooms in.
I have a PDF file with tables, images and so on. I want to translate text of this PDF file into another language and create a PDF file that is similar to the first file but contains translated text (it should have images, tables, ... like first file).
How can I write a program in C++ that does this work?
I have a program that extracts text from PDF file and converts text but I can't create output PDF file with tables and images in special positions. How can I create a PDF file that has the layout as the original file?
Your program should read the PDF in a memory structure (like a tree of objects) then translate the text leafs in memory, then dump the memory structure back to PDF.
To do so, you need a pdf parsing library which allows you to manipulate the object representation.
I am not a C++ dev, so I don't know the C++ library universe; but from a quick search on google, it looks like PoDoFo can do this job.
I have a JPEG file on disk which is not quite normal - this JPEG file has additional rubbish data appended behind End Of Image (FFD9). This JPEG file can still be opened by JPEG viewers though.
I wish to remove those additional information behind End Of Image (FFD9). The constraints are:
Must be done programatically
Must be lossless
Must use native code, e.g. C++
One way I've found out is to re-save the file using IrfanView command-line tool, using lossless JPG_TRANSFORM's command: /jpg_rotate. The additional data behind are automatically stripped off.
However, is there another way in which I can do it in C++ code, If possible, I do not wish to use exes like IrfanView to do it. I wish to do everything in code to keep things lean.
I am thinking of detecting the End Of File (FFD9), then save the buffer before EOF into another JPEG. But, how can I save the buffer losslessly?
I guess this is a file handling question and NOT an Image Processing related.
All you need to do write all data till EOF in your Image file into the resultant Image file.
Greetings all,
I am currently a rising Sophomore (CS major), and this summer, I'm trying to teach myself C++ (my school codes mainly in Java).
I have read many guides on C++ and gotten to the part with ofstream, saving and editing .txt files.
Now, I am interested in simply importing an image (jpeg, bitmap, not really important) and renaming the aforementioned image.
I have googled, asked around but to no avail.
Is this process possible without the download of external libraries (I dled CImg)?
Any hints or tips on how to expedite my goal would be much appreciated
Renaming an image is typically about the same as renaming any other file.
If you want to do more than that, you can also change the data in the Title field of the IPTC metadata. This does not require JPEG decoding, or anything like that -- you need to know the file format well enough to be able to find the IPTC metadata, and study the IPTC format well enough to find the Title field, but that's about all. Exactly how you'll get to the IPTC metadata will vary -- navigating a TIFF (for one example) takes a fair amount of code all by itself.
When you say "renaming the aforementioned image," do you mean changing metadata in the image file, or just changing the file name? If you are referring to metadata, then you need to either understand the file format or use a library that understands the file format. It's going to be different for each type of image file. If you basically just want to copy a file, you can either stream the contents from one file stream to another, or use a file system API.
std::ifstream infs("input.txt", std::ios::binary);
std::ofstream outfs("output.txt", std::ios::binary);
outfs << insfs.rdbuf();
An example of a file system API is CopyFile on Win32.
It's possible without libraries - you just need the image specs and 'C', the question is why?
Targa or bmp are probably the easiest, it's just a header and the image data as a binary block of values.
Gif, jpeg and png are more complex - the data is compressed