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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a background service which is running in kitkat always throwing Waited long enough for: ServiceRecord message in the logcat. But in the previous versions of android my app is running smoothly without any issues. also Sometimes my service is automatically killed in the Kitkat. 回答1: This is caused by "Serialize running of background services" modification for ActivityServices. Implement #10744011: Serialize running of background services Added some code to the activity manager to keep track of services that are launching and limit the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Regarding SQL Server, I understand : var means the memory is lazy allocated, meaning it fits to the data exactly (on insertion). MAX means there is no size restriction\limitation. Then, is it always preferable to use MAX when using varchar , as we don't allocate the whole size anyhow? Should we use a constant size only if there is a constraint we want to enforce on this DB column? 回答1: There is a very good article on this subject by SO User @Remus Rusanu. Here is a snippit that I've stolen but I suggest you read the whole thing: The code

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I'm using the following code for downloading file in my Android project: URL url = new URL ( fileUrl ); URLConnection conection = url . openConnection (); conection . setDoOutput ( true ); conection . connect (); int lenghtOfFile = conection . getContentLength (); If fileUrl is apk, lenghtOfFile always return -1. But if it is image, video type,... lenghtOfFile return is exactly. Why ? I'm using eclipse, Android SDK revision 23. 回答1: The content length is not always available because by default Android request a GZIP compressed

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: cv2.imread is always returning NoneType . I am using python version 2.7 and OpenCV 2.4.6 on 64 bit Windows 7. Maybe it's some kind of bug or permissions issue because the exact same installation of python and cv2 packages in another computer works correctly. Here's the code: im = cv2 . imread ( "D:\testdata\some.tif" , CV_LOAD_IMAGE_COLOR ) I downloaded OpenCV from http://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv . Any clue would be appreciated. 回答1: It might indeed be an OpenCV bug that is not resolved yet. cv2.imread is not

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: sock.setblocking(0) try: data = sock.recv(1024) except socket.error, e: if e.args[0] == errno.EWOULDBLOCK: print 'EWOULDBLOCK' else: if not data: #recv over sock.close() print 'close=================' else: print 'recv ---data---------' poem += data all above code is in a loop.using non-blocking socket (just want to test 'non-blocking socket') to get data. But always print 'EWOULDBLOCK',i don't know why? 回答1: The socket is non-blocking so recv() will raise an exception if there is no data to read. Note that errno.EWOULDBLOCK = errno.EAGAIN =

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: So, I am trying to rename a folder in my repository using git filter-branch --index-filter , but I always end up with a "fatal: bad source" error. The problem is easily demonstrated on a test repository using a file instead of a folder. Preparation: $ git init $ echo whatever >> my_file.txt $ git add . $ git commit -m "initial" $ echo whatever2 >> my_file2.txt $ git add . $ git commit -m "second" Now, I am trying to change my_file.txt to your_file.txt : $ git filter-branch --index-filter 'git mv my_file.txt your_file.txt' HEAD But it doesn't

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm slowly working through Bruce Eckel's Thinking in Java 4th edition , and the following problem has me stumped: Create a class with a finalize( ) method that prints a message. In main( ), create an object of your class. Modify the previous exercise so that your finalize( ) will always be called. This is what I have coded: public class Horse { boolean inStable; Horse(boolean in){ inStable = in; } public void finalize(){ if (!inStable) System.out.print("Error: A horse is out of its stable!"); } } public class MainWindow { public static void

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This code used to work but on Android 4.2 and OpenCV 2.4.4 it fails, but I don't know why. Can anyone shed any light on it for me? Thanks for any help. Baz public void SaveImage (Mat mat) { Mat mIntermediateMat = new Mat(); Imgproc.cvtColor(mRgba, mIntermediateMat, Imgproc.COLOR_RGBA2BGR, 3); File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES); String filename = "barry.png"; File file = new File(path, filename); Boolean bool = null; filename = file.toString(); bool = Highgui.imwrite(filename,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I'm dealing with currencies and I want to round down the number to 2 decimal places. Even if the number is 500.0, I would like it to be 500.00 to be consistent. When I do "500.00".to_d it converts it to 500.0. Whats a good way of changing this behavior? I also use this method to round down to 2 digits and make sure it always has 2 decimals. def self . round_down ( x , n = 2 ) s = x . to_s l = s . index ( '.' ) ? s . index ( '.' ) + 1 + n : s . length s = s [ 0 , l ] s = s . index ( '.' ) ? s . length - ( s . index ( '.' ) + 1 ) ==

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Must program execution start from main, or can the starting address be modified? #include void fun(); #pragma startup fun int main() { printf("in main"); return 0; } void fun() { printf("in fun"); } This program prints in fun before in main . 回答1: The '#pragma' command is specified in the ANSI standard to have an arbitrary implementation-defined effect. In the GNU C preprocessor, '#pragma' first attempts to run the game 'rogue'; if that fails, it tries to run the game 'hack'; if that fails, it tries to run GNU Emacs displaying the Tower of