基本上,我需要幫助解決堆棧溢出錯誤我一直在我的ipad/iphone應用程序。我一直在試圖修復它在過去的10天,但沒有用。沒有遞歸,因爲堆棧溢出錯誤,無遞歸
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
無論何時在UITextField中更改字符/字符串時都會被調用一次。
基本上這裏就是我有一個問題的一部分:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if(textField == m_curValueField)
{
if([string rangeOfCharacterFromSet:[[NSCharacterSet characterSetWithCharactersInString:@"ABCDEFabcdef"] invertedSet]].location != NSNotFound)
{
return NO;
}
NSString *addedString = m_curValueField.text;
addedString = [addedString stringByReplacingCharactersInRange:range withString:string];
if(m_instructionType == TYPE_1)
{
if(addedString.length > 4)
return NO;
}
else if(m_instructionType == TYPE_2)
{
if(addedString.length > 8)
return NO;
}
NSString *result = @"UNDEFINED";
if([m_curValueField.text isEqualToString:addedString])
{
return NO;
}
if(m_instructionType == TYPE_THUMB)
{
if(addedString.length == 4)
{
NSString *temp = @"";
temp = [temp stringByAppendingString:m_curValueField.text];
temp = [temp stringByAppendingString:string];
NSString *firstByte = [temp substringWithRange:NSMakeRange(0, 2)];
NSString *secondByte = [temp substringWithRange:NSMakeRange(2, 2)];
temp = [NSString stringWithFormat:@"%@%@",secondByte,firstByte];
uint16_t bytes;
memcpy(&bytes, [temp cStringUsingEncoding:NSASCIIStringEncoding], sizeof(uint16_t));
char bits [16];
sprintf (bits,BYTETOBINARYPATTERN,BYTETOBINARY(bytes));
result = [m_thumbconverter HexToThumb:bits];
}
}
else if(m_instructionType == TYPE_2)
{
if(addedString.length == 8)
{
NSString *temp = @"";
temp = [temp stringByAppendingString:m_curValueField.text];
temp = [temp stringByAppendingString:string];
NSString *firstByte = [temp substringWithRange:NSMakeRange(0, 2)];
NSString *secondByte = [temp substringWithRange:NSMakeRange(2, 2)];
NSString *thirdByte = [temp substringWithRange:NSMakeRange(4, 2)];
NSString *fourthByte = [temp substringWithRange:NSMakeRange(6, 2)];
temp = [NSString stringWithFormat:@"%@%@%@%@",fourthByte,thirdByte,secondByte,firstByte];
uint32_t bytes;
memcpy(&bytes, [temp cStringUsingEncoding:NSASCIIStringEncoding], sizeof(uint32_t));
char bits[32];
sprintf (bits,BYTETOBINARYPATTERN,BYTETOBINARY(bytes));
result = [m_armconverter HexToARM:bits];
}
}
m_curNewValueField.text = [result copy];
}
return YES;
}
它基本上轉換十六進制的ARM/Thumb。 HexToThumb/HexToARM函數可以工作,並返回一個值。基本上問題是,當m_instructionType等於TYPE_1時,應用程序崩潰,堆棧溢出。但是,當它等於TYPE_2時,新字段的值會相應更改。當我NSLog代碼在不同的位置,看起來代碼運行良好,HexToThumb函數返回一個正確的值。它甚至繼續,並在m_curNewValueField = [結果副本]後的日誌;實際上顯示在系統日誌中。 順便說一句,這裏是BYTETOBITPATTERN和BYTETOBINARY的定義:
#define BYTETOBINARYPATTERN "%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d"
#define BYTETOBINARY(bytes) \
(bytes & 0x80000000 ? 1 : 0), \
(bytes & 0x40000000 ? 1 : 0), \
(bytes & 0x20000000 ? 1 : 0), \
(bytes & 0x10000000 ? 1 : 0), \
(bytes & 0x8000000 ? 1 : 0), \
(bytes & 0x4000000 ? 1 : 0), \
(bytes & 0x2000000 ? 1 : 0), \
(bytes & 0x1000000 ? 1 : 0), \
(bytes & 0x800000 ? 1 : 0), \
(bytes & 0x400000 ? 1 : 0), \
(bytes & 0x200000 ? 1 : 0), \
(bytes & 0x100000 ? 1 : 0), \
(bytes & 0x80000 ? 1 : 0), \
(bytes & 0x40000 ? 1 : 0), \
(bytes & 0x20000 ? 1 : 0), \
(bytes & 0x10000 ? 1 : 0), \
(bytes & 0x8000 ? 1 : 0), \
(bytes & 0x4000 ? 1 : 0), \
(bytes & 0x2000 ? 1 : 0), \
(bytes & 0x1000 ? 1 : 0), \
(bytes & 0x800 ? 1 : 0), \
(bytes & 0x400 ? 1 : 0), \
(bytes & 0x200 ? 1 : 0), \
(bytes & 0x100 ? 1 : 0), \
(bytes & 0x80 ? 1 : 0), \
(bytes & 0x40 ? 1 : 0), \
(bytes & 0x20 ? 1 : 0), \
(bytes & 0x10 ? 1 : 0), \
(bytes & 0x08 ? 1 : 0), \
(bytes & 0x04 ? 1 : 0), \
(bytes & 0x02 ? 1 : 0), \
(bytes & 0x01 ? 1 : 0)
非常感謝你。
任何人都可以幫我嗎? –