摘自移动开发精英群 ，一般可用来判断未知类型的文件类型
#import "ParseFile.h"
#include <stdio.h>
#include <iostream>
using namespace std;
@implementation ParseFile
/**
* 读取文件的头8字节和尾8字节的十六进制
*/
+ (NSString *)getStringWithEight:(NSString *)imagePath
{
// 2. OC字符串对象转C语言字符串
NSString *stringOBJ = imagePath;
const char *resultCString = NULL;
if ([stringOBJ canBeConvertedToEncoding:NSUTF8StringEncoding]) {
resultCString = [stringOBJ cStringUsingEncoding:NSUTF8StringEncoding];
}
//char const *resultCString = [imagePath UTF8String];
string str_ab;
getFileAbstract(str_ab, resultCString);
NSLog(@"%s", str_ab.c_str());
NSString *str = [NSString stringWithFormat:@"%s",str_ab.c_str()];
NSLog(@"%@", str);
return str;
}
/**
* 取一个文件的前8个字节的16位和8个字节的16位
*/
void getFileAbstract(string &str_abstract, string filepath)
{
FILE* pFile = fopen(filepath.c_str(), "rb");
if (pFile == 0) return;
char buf[16] = {0};
fread(buf, 1, 8, pFile);
fseek(pFile, -8, SEEK_END);
fread(buf+8, 1, 8, pFile);
int i = 0;
while (i<16) {
char temp[3] = {0};
sprintf(temp, "%.2x", 0xff&buf[i]);
str_abstract += temp;
NSLog(@"%s", __func__);
i = i + 1;
NSLog(@"i = %d", i);
}
}
@end
-------调用分割线----
- (void)testParseFile{
NSString *path = [[NSBundle mainBundle] pathForResource:@"kkk" ofType:@"jpg"];
NSString *outString = [ParseFile getStringWithEight:path];
NSLog(@"OutString--- %@",outString);
}
