converter | 易学教程

Xamarin form: IValueConverter receive null value in Convert method

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问题 I have a list view set with item source as child. I want to bind a child object to a view which will set the color through the converter. The converter method got called but the value i passed in was null . Apart from dot, I also use Path=/ but the value passed to the converter still null . If i bind the property, it's fine but not the current item. <ListView x:Name="childListView" VerticalOptions="FillAndExpand" HasUnevenRows="true" ItemSelected="OnItemSelected" ItemTapped="OnItemTapped">

convert base64 to base62 (without special characters)

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问题 I want to pass a blowfish encrypted string in a URL, and want to encode it like base64, but without any special character, something like base62 would be great (0-9a-zA-Z). So what I'm trying to do is converting the blowfish encrypted string using base64_encode, and convert base64 to base62. I know about solutions how to make base64 url-safe, but I really don't want any special character in the string. convert_base() only works with base up to 36, the math extensions can convert up to base 62

Spring mvc 自定义时间转换器

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<bean id="conversionService" class="org.springframework.format.support.DefaultFormattingConversionService"> <property name="converters"> <list> <bean class="org.converter.DateConverter"></bean> </list> </property> </bean>  <mvc:annotation-driven conversion-service="conversionService" /> 注意：class 也可以为： org.springframework.context.support.ConversionServiceFactoryBean package org.converter; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import org.springframework.core.convert

How do I convert microseconds into a timestamp?

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问题 I took this piece from an unencrypted .DAT file: Code: 00 e1 27 17 6f e6 69 c0 Which translates to 63,374,851,375,000,000 in decimal. The units for the number are microseconds. And this huge number cannot bypass the 1st January 1970 00:00:00 format; such a format that most converters use today. So, yes. Is there such a converter that uses the 1st January of the year 1 format? Or how shall I make one? And by the way, a timestamp is both date and time. Thanks in advance! 回答1: You do not say

What are the best Spring converter strategies in the case of a String to convert to a set of object?

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来源： https://stackoverflow.com/questions/3095146/what-are-the-best-spring-converter-strategies-in-the-case-of-a-string-to-convert

Convert from JSON object to expando object in c#

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来源： https://stackoverflow.com/questions/29074434/convert-from-json-object-to-expando-object-in-c-sharp

What's the difference between dtype and converters in pandas.read_csv?

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来源： https://stackoverflow.com/questions/34139102/whats-the-difference-between-dtype-and-converters-in-pandas-read-csv

Convert multiple character columns to as.Date and time in R

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来源： https://stackoverflow.com/questions/48908466/convert-multiple-character-columns-to-as-date-and-time-in-r

Convert multiple character columns to as.Date and time in R

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来源： https://stackoverflow.com/questions/48908466/convert-multiple-character-columns-to-as-date-and-time-in-r

ffmpeg : how to determine frame rate automatically?

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问题 I use this simple script to convert video to images using ffmpeg , but frame rate is fixed, how can I determine it automatically? FRAME_RATE="30" SEPARATOR='/' VIDEO_PATH=$1 VIDEO_BASE_DIR=`dirname $1` FRAMES_DIR=$VIDEO_BASE_DIR$SEPARATOR"Frames" rm -rf $FRAMES_DIR mkdir $FRAMES_DIR #Convert video to images ./ffmpeg -r $FRAME_RATE -i $VIDEO_PATH $FRAMES_DIR$SEPARATOR"image%d.png" UPDATE: By ffprobe I checked that my 1st video frame rate is 30. Also results are the same (339 frames are