將const char *轉換爲NSString *並轉換回來_NSAutoreleaseNoPool（）

Question

我試圖將常量char *轉換爲NSString *，然後將其轉換回來。它的工作原理，但我得到：

__NSAutoreleaseNoPool(): Object 0x100550a40 of class NSCFArray autoreleased with no pool in place - just leaking 
__NSAutoreleaseNoPool(): Object 0x100551730 of class NSCFString autoreleased with no pool in place - just leaking 
__NSAutoreleaseNoPool(): Object 0x100551f10 of class NSCFData autoreleased with no pool in place - just leaking 

的代碼是：

const char* convert = "hello remove this: *"; 

NSString *input = [[NSString alloc] initWithUTF8String:convert];// convert 

//remove * FROM THE STRING   
NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@"*"]; 

// REPLACE * WITH NOTHING     
input = [[input componentsSeparatedByCharactersInSet: doNotWant] componentsJoinedByString: @""]; 

// CONVERT BACK   
const char *converted_back = [input UTF8String]; 

我迷路了，請幫我出。

Answer 1

如果您在後臺線程中執行此操作，請添加一個NSAutoReleasePool。

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; 
const char* convert = "hello remove this: *"; 
NSString *input = [[[NSString alloc] initWithUTF8String:convert] autorelease];// convert 
//remove * FROM THE STRING   
NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@"*"]; 
// REPLACE * WITH NOTHING     
input = [[input componentsSeparatedByCharactersInSet: doNotWant] componentsJoinedByString: @""]; 
// CONVERT BACK   
const char *converted_back = [input UTF8String]; 
[pool drain]; 

此外，您還需要釋放input你用它做後，或使其自動釋放。