i would like to convert an image to Base64-encoded in esp32 cam . already i used method under detail like this :
ConvertBase64("D:/ok.jpg","D:/edcodedFolder");
but not working (edcodedFolder is empty)
maybe another/right way is using method under detail :
static String encode(const uint8_t * data, size_t length, bool doNewLines = true);
but i dont know how to use above method .
would you please help me?
finaly i found solution under detail that works fine
String encrypt = base64::encode(fb->buf, fb->len);
Related
I am trying to lock a file with the flock function but I am not able to do it. I work with Laravel 8 and Storage Class.
The code is as follows:
$disk = Storage::disk('communication');
$file_name = 'received.json';
$file_exists = $disk->exists($file_name);
if($file_exists){
flock($disk->get($file_name), LOCK_EX);
...
}
The problem I'm having is that when I invoke the get() function on the file path, it returns the contents of the file (a string), which causes the following error:
flock() expects parameter 1 to be resource, string given
I need to know how to get file as a resource and not the content of the file.
Could someone help me and tell me how to do it?
Thank you very much in advance.
You can use Storage::readStream() method
if($file_exists){
$stream=Storage::disk('communication')->readStream($file_name);
flock($stream, LOCK_EX);
}
As per php doc
flock(resource $stream, int $operation, int &$would_block = null): bool
First param needed stream.flock() allows you to perform a simple
reader/writer model which can be used on virtually every platform
(including most Unix derivatives and even Windows).
Ref:https://www.php.net/manual/en/function.flock.php
I am trying to read different tag values (like tags 259 (Compression), 33432 (Copyright), 306 (DateTime), 315 (Artist) etc.) from a TIFF image in Java. Can anyone suggest what is best way to get those values in Java 11 ?
i tried to get those values using tiffinfo commands (like "tiffinfo -c myfile.tif"). But i did not find any specific command in tiffinfo (libtiff) or any Java library which will give me the specific tag values (e.g. DateTime) of a TIFF image.
Update:
As haraldK suggested, i tried with ImageIO like following
try (ImageInputStream input = ImageIO.createImageInputStream(tiffFile)) {
ImageReader reader = ImageIO.getImageReaders(input).next(); // TODO: Handle reader not found
reader.setInput(input);
IIOMetadata metadata = reader.getImageMetadata(0);
TIFFDirectory ifd = TIFFDirectory.createFromMetadata(metadata);
TIFFField dateTime = ifd.getTIFFField(306);
String dateString = dateTime.getAsString(0);
}
But it does not give exact value of the tag. In case of non-ASCII value (ö, ü, ä etc), question marks replace the real values.
Can anyone tell me how to get the exact value (including non-ASCII) of the tag from TIFFField ?
You can use standard ImageIO, read the TIFF image metadata and get the requested values from it, like this by using some extra support classes in the JDK, starting from Java 9:
try (ImageInputStream input = ImageIO.createImageInputStream(tiffFile)) {
ImageReader reader = ImageIO.getImageReaders(input).next(); // TODO: Handle reader not found
reader.setInput(input);
IIOMetadata metadata = reader.getImageMetadata(0); // 0 is the index of first image
TIFFDirectory ifd = TIFFDirectory.createFromMetadata(metadata);
TIFFField dateTime = ifd.getTIFFField(306); // Yes, that's 3 F's...
String dateString = dateTime.getAsString(0); // TIFF dates are strings...
}
tiffFile must be a valid (existing, readable) java.io.File, java.io.RandomAccessFile or java.io.InputStream (or other supported input, this is plugin-based, really). If not, input will be null, and the code will fail.
You can use similar, but a lot more verbose version, that will work in older versions of Java, as long as you have a TIFF plugin:
try (ImageInputStream input = ImageIO.createImageInputStream(tiffFile)) {
ImageReader reader = ImageIO.getImageReaders(input).next(); // TODO: Handle reader not found
reader.setInput(input);
IIOMetadata metadata = reader.getImageMetadata(0); // 0 is the index of first image
// Get "native" TIFF metadata for first IFD
IIOMetadataNode root = metadata.getAsTree("com_sun_media_imageio_plugins_tiff_image_1.0");
Node ifd = root.getFirstChild();
NodeList fields = ifd.getElementsByTagName("TIFFField"); // Yes, that's 3 F's...
for (int i = 0; i < fields.getLength(); i++) {
Element field = (Element) fields.item(i);
if ("306".equals(field.getAttribute("number"))) {
// This is your DateTime (306) tag,
// now do something with it 😀
// ...
}
}
}
Hardly elegant code, though... The Java 9+ approach is much cleaner and easier to reason about.
Previously, i was able to store a base64 image using GridFsTemplate as below.
val imageBytes = javax.xml.bind.DatatypeConverter.parseBase64Binary("base64 image string")
gridFsTemplate.store(ByteArrayInputStream(imageBytes), "imagename")
However the store() function of ReactiveGridFsTemplate takes in a parameter which is of type Flux<DataBuffer>. How can i convert a base64 image to that type?
I believe you can use AsyncStreamHelper.toAsyncInputStream with the base64 as a byte array.
I'm on my phone right now so I can't write an example, but you can check the second last method of the class here: https://github.com/BayviewComputerClub/smoothie-web/blob/master/src/main/java/club/bayview/smoothieweb/repositories/TestDataRepository.java
I have a json string to build a query, and I need to convert this to QueryBuilder. (ES Ver. 6.3.0)
I found that I can use wrapperQuery method, so I wrote this code:
String str = cond.getFilter().toString();
QueryBuilder filter = QueryBuilders.boolQuery().must(QueryBuilders.wrapperQuery(str));
And these are result of variables in debug mode:
This method is working right, as the decription in the Docs(https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-wrapper-query.html)
The problem is, that this query just not working.
What is wrong and what should I do?
Any comments would be appreciated. Thanks.
Your JSON format seems to be wrong. Since your ASSET_IP is not a number, it must be string in JSON representation. Hence you need to put it as below in your JSON.
{ "ASSET_IP" : "xx.xxx.xxx.xx" }
Update your JSON with the above and try again.
I have encrypted email Address like
$this->load->library('encrypt');
$encoded = $this->encrypt->encode('user_email_address');
In codeigniter Model.
And after that when I tried to decode, it does not show the correct data.
$this->encrypt->decode('user_email_address');
It shows like
Jts¹+…Ru\¼A·¾Àp¤c’áµSîÆKÆ—l¿Ýƒ>ü«%c‚µ~SÔNÏŠÖä3; ñÑ
Please help me to solve this issue
Thanks in advance.
You can't use directly email to decode
Use it as
$this->load->library('encrypt');
$encodedEmail = $this->encrypt->encode('user_email_address');
$myEmail = $this->encrypt->decode($encodedEmail);
set encryption_key based on the algorithm used for encryption.
eg. for AES-128, encryption key must be 128 bits or 16 bytes (characters) long.
Or you can create key in your function itself before calling encode() function like:
$key = $this->encryption->create_key(16);
for more details : refer https://www.codeigniter.com/user_guide/libraries/encryption.html