#pragma mark 字符串转长度
- (int)convertToInt:(NSString*)str
{
int length = 0;
char* p = (char*)[str cStringUsingEncoding:NSUnicodeStringEncoding];
for (int i=0 ; i<[str lengthOfBytesUsingEncoding:NSUnicodeStringEncoding] ;i++)
{
if (*p)
{
p++;
length++;
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}
else {
p++;
}
}
int realLength = length/2+length%2;
return realLength;
}