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使用App Inventor扩展实现多点触控：Rotation Detector 旋转检测 · App Inventor 2 中文网
...ION_MOVE:
Log.i("Rotate","Action Move");
if(ptrID1 != INVALID_POINTER_ID && ptrID2 != INVALID_POINTER_ID){
float nfX, nfY, nsX, nsY;
nsX = event.getX(event.findPointerIndex(ptrID1));
nsY = event.getY(eve...
How to create a new file together with missing parent directories?
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This only works if the file was created with a path string which contains a parent directory, i.e. new File("file.txt").getParentFile() returns null, new File("dir/file.txt").getParentFile() returns the same as new File("dir")
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Remove all but numbers from NSString
...g:@"0123456789"];
while ([scanner isAtEnd] == NO) {
NSString *buffer;
if ([scanner scanCharactersFromSet:numbers intoString:&buffer]) {
[strippedString appendString:buffer];
} else {
[scanner setScanLocation:([scanner scanLocation] + 1)];
}
}
NSLog(@"%@", strippedString); // "...
django template display item value or empty string
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You want the default_if_none template filter, (doc).
default_if_none will display the given string if the variable is 'None'.
default will display the string if the variable evaluates to False, ie empty strings, empty lists etc
{{ item.somefie...
Difference between Ctrl+Shift+F and Ctrl+I in Eclipse
I have been used Ctrl + Shift + F to correct indentation but I heard there is another shortcut to do that: Ctrl + I
4 An...
GIT commit as different user without email / or only email
I'm trying to commit some changes as a different user, but i do not have a valid email address, following command is not working for me:
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How do I force Sublime Text to indent two spaces per tab?
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If you want it for all files, go to Preferences -> Settings - Default/User. But as several comments below indicate, Syntax Specific settings can limit it to just the languages you choose.
To limit this configuration to ...
ios app maximum memory budget
...want to limit them with a budget. I guess we'll just have to test on many different devices in different settings to find a reasonable maximum memory footprint to use.
– frilla
May 5 '11 at 0:42
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switch() statement usage
...Well, timing to the rescue again. It seems switch is generally faster than if statements.
So that, and the fact that the code is shorter/neater with a switch statement leans in favor of switch:
# Simplified to only measure the overhead of switch vs if
test1 <- function(type) {
switch(type,
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How to redirect single url in nginx?
...ss of reorganizing url structure.
I need to setup redirect rules for specific urls - I'm using NGINX.
3 Answers
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