Objective c 目标C按字节比较2个文件

这段代码应该加载2个文件，并按字节比较它们并输出差异，但出于某种原因，即使使用了相同的文件并且似乎忽略了我的格式，它也会输出差异

任何帮助都将不胜感激

谢谢

int main(int argc, const char * argv[])
{
    @autoreleasepool {
    NSString *pathA = [[NSBundle mainBundle] pathForResource:@"original/testfile" ofType:@""];
    NSFileHandle *fileA = [NSFileHandle fileHandleForReadingAtPath:pathA];
    NSString *pathB = [[NSBundle mainBundle] pathForResource:@"updated/testfile" ofType:@""];
    NSFileHandle *fileB = [NSFileHandle fileHandleForReadingAtPath:pathB];
    unsigned long long sizeofFile = [fileA seekToEndOfFile];
    [fileA seekToFileOffset:0];
    [fileB seekToFileOffset:0];
    unsigned int fileaValue;
    unsigned int filebValue;
    for (int i = 0; i <= sizeofFile; i++) {
        [[fileA readDataOfLength:1] getBytes:&fileaValue];
        [[fileB readDataOfLength:1] getBytes:&filebValue];
        if (fileaValue != filebValue)
            NSLog(@"File A %02x File B %02x at offset %u:",fileaValue,filebValue,i);
    }
    [fileA closeFile];
    [fileB closeFile];
    }
return 0;
}

---

我认为问题可能在于您选择的数据类型（如果您想要一个字节，则使用

uint8_t

），并且几乎可以肯定您使用

，正如特洛伊木马用户在下面的回答中所指出的，请注意for循环的条件<代码>
 2013-03-13 13:50:50.580 compareFile[12055:303] File A 7fce File B 5fbff9ce at offset 0:
 2013-03-13 13:50:50.581 compareFile[12055:303] File A 7ffa File B 5fbff9fa at offset 1:

uint8_t fileaValue;
uint8_t filebValue;
for (unsigned i = 0; i < sizeofFile; i++) {   // NOT <=
    [[fileA readDataOfLength:1] getBytes:&fileaValue];
    [[fileB readDataOfLength:1] getBytes:&filebValue];
    if (fileaValue != filebValue)
        NSLog(@"File A %02x File B %02x at offset %u:", (unsigned)fileaValue, (unsigned)filebValue,i);
}