objective c - How to append the bytes of a bit-field to NSMutableData -

-

मेरे पास एक स्ट्रक्चर 

  typedef struct {int8_t foo: 1; } बार;   
 मैंने बाइट्स को एक NSMutableData ऑब्जेक्ट के समान जोड़ने की कोशिश की है:  
  NSMutableData * data = [[NSMutableData alloc] init]; बार अस्थायी; Temp.foo = 1; [डेटा संलग्नक: & amp; temp.foo लंबाई: sizeof (int8_t)];   
 लेकिन मुझे बिट-फील्ड का पता करने का एक त्रुटि प्राप्त हुई। मैं बाइट को कैसे जोड़ सकता हूं?   
 
 
 बाइट को इंगित करें, आवश्यक बिट को मुखौटा दें, और चर संलग्न करें एक बाइट के रूप में:  
  टाइपिंगफ़ाइल संरचना {int8_t foo: 1; } बार; NSMutableData * डेटा = [[NSMutableData alloc] init]; बार अस्थायी; Temp.foo = 1; Int8_t * p = (int8_t *) (और अस्थायी + 0); // बाइट को शिफ्ट करें आपको int8_t pureByte = * p & amp; 0x01; // मास्क को आप की ज़रूरत होती है [डेटा एपेंडबिट्स: & amp; शुद्धबैटे लंबाई: आकारफ (int8_t)];

Comments

Post a Comment

Popular posts from this blog

mysql - BLOB/TEXT column 'value' used in key specification without a key length -

-
I have developed an extension which works up to 1.6 on Magren (I'm trying Enterprise Edition, And I think the community is the same problem, because it is the same code). In my install script, I see the $ installer-> gt; CreateEntityTables ($ this- & gt; getTable ('alphanum / info')); The installation is done until it is not in the _text unit table. It crashed there! It turns out that when I log in to SQL and run it via PHPmyadmin, then this error is: Blob / Text column 'value' is used without the key 'key' . I saw the code there, and this is what is trying to create an index on the value column: -> addIndex ($ this- & gt; getIdxName ($ eavTableName, array ( 'attribute_id array (' attribute_id ',' value ')) - & gt; addIndex ($ this- & gt; getIdxName ($ eavTableName, array (' entity_type_id ' , 'Value')), array ('entity_type_id', 'value')) If there is no if statement is n...
Read more

memcached - Django cache performance -

-
We are now using Redis for in-memory cache for our Django application (we used the first memcatch The difference in performance is no big, and we're using Redis because the disc dump feature). The problem is that Django cache's performance in my view - terrible, we have a view with 102 cache hits (no miss), and it has 81 ms (only the cash part, which is with the DJBugBug toolbar Is measured). In my opinion - this is a very long time, I know, asking for a question for DB can be 10x more (or 100x) time, but that is also not good with cash performance of that fact. We are running radis (and the first memacatch) on different hosts, connected to the local network with other servers. Is there a way to maximize cache performance in Django? Instead of displaying problem cache, there is a possibility of the number of items to be received for each page 102 Cash calls mean long time lost due to network latency. With full control of the code, you may be able to fix it with m...
Read more

java : convert string value to int -

-
to JTable , I follow the row for [row 1] and calculate the values Do: Last Array List & lt; String & gt; Value = new array list & lt; String & gt; (); End end nb = myTable.getRowCount (); Int sum = 0; (Int i = 1; i & lt; nb; i ++) for {string column = value = myTable.getColumnValue (i, columnName); Yoga = Yoga + Integer.parseInt (columnValue); Value list Add (column value); } But I found: java.lang.NumberFormatException: for input string: "java.lang.NumberFormatException.forInputString (unknown source) Java.lang.Integer.parseInt (unknown source) at Java.lang.Integer.parseInt (unknown source) Your table contains at least one empty cell. Here's a suggestion: Try {sum + = integer.parseont (columnValue) );} Hold (Number Format Expection NFE) {// Cell is either empty or not an integer number // Note, method getColumnValue (int i, string name) javax.swing. JTable is not defined for . If you use the subclass of JTable , then there ...
Read more