stringByReplacingOccurrencesOfString 中的随机 malloc 崩溃

Question

我在 stringByReplacingOccurrencesOfString 中遇到随机 malloc 崩溃。我注意到它在较长的字符串上崩溃，但我似乎找不到原因。可能是什么问题？

错误：

CashTrader(53448,0xb0103000) malloc: *** error for object 0x5c5eca0: incorrect checksum for freed object - object was probably modified after being freed.

输入 cryptoparams

raStwjnw9uiOEHzF00UazOUp879zUuLwJ6J300BH2DMH29Pww/4mOR3oHXv4F/CL

示例代码：

-(NSURL *)createReqUrl:(NSString *)hostString secure:(BOOL)usessl urlRoot:(NSString*)urlRoot encryptedParam:(NSString *)encryptedparams{
    NSString *encryptString;
    encryptString = nil;



    encryptString = [encryptedparams stringByReplacingOccurrencesOfString:@"+" withString:@"%%2b"];
    encryptString = [encryptString  stringByReplacingOccurrencesOfString:@"/" withString:@"%%2f"];
    encryptString = [encryptString stringByReplacingOccurrencesOfString:@"=" withString:@"%%3d"];
    encryptString = [encryptString stringByReplacingOccurrencesOfString:@"@" withString:@"%%40"];

    NSString *answer = [[NSString alloc] initWithString:urlRoot];
    answer = [[answer stringByAppendingString:encryptString] stringByReplacingOccurrencesOfString:@"%%" withString:@"%"];

    NSString *scheme = nil;
    if (usessl)
        scheme = @"https://";
    else
        scheme = @"http://";

    return [[NSURL alloc] initWithString:[[scheme stringByAppendingString:hostString] stringByAppendingString:answer]];;
}

Answer 1

我确实相信你的 encryptString 应该是 NSMutableString。