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當我使用MD5加密str
,我得到警告:當我加密我得到隱式轉換字符串失去整數精度:「無符號長」到「CC_LONG」(又名「無符號整型」)
隱式轉換失去了整數精度:'unsigned long'到'CC_LONG'(又名'unsigned int')。
+ (NSString *)md5To32bit:(NSString *)str {
const char *cStr = [str UTF8String];
unsigned char digest[CC_MD5_DIGEST_LENGTH];
CC_MD5(cStr, strlen(cStr),digest); // here I get the warning.
NSMutableString *result = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
[result appendFormat:@"%02x", digest[i]];
return result;
}