void hexdump(void* ptr, const int buflen)
{
unsigned char* buf = (unsigned char*)ptr;
int i, j, d, hex = 0;
short* ins;
string op;
for (i = 0; i < buflen; i += 16) {
    for (j = 0; j < 16; j += 4) { 
        if (i + j < buflen) {
            cout << buflen << endl;
            cout << "inst " << (i+j) / 4 << ": ";

我使用的是linux ubuntu服务器。我编程的目的是读取机器代码二进制文件，得到汇编代码并打印出来。然而，上面的代码是打印故障的地方。直到cout<<“inst”<<(i+j)/4<<“：”；它工作，并打印bufen(24)，但在此之后**分段错误(核心转储)**出现，我的执行停止。这些是代码的其余部分。(查找，尚未创建或使用功函数)

# include <fstream>

# include <vector>

# include <iostream>

# include <algorithm>

using namespace std;

string find(char op[7]);
void work(string inst, short* ins);

void hexdump(void* ptr, const int buflen)
{
unsigned char* buf = (unsigned char*)ptr;
int i, j, d, hex = 0;
short* ins;
string op;
for (i = 0; i < buflen; i += 16) {
    for (j = 0; j < 16; j += 4) { 
        if (i + j < buflen) {
            cout << buflen << endl;
            cout << "inst " << (i+j) / 4 << ": ";
            for (int a = 0; a < 32; a += 8) {
                d = buf[i + j + a / 8];

                for (int k = 0; k < 8; k++) {
                    if (d % 2 != 0) {
                        ins[k + a] = 1;
                    }
                    else {
                        ins[k + a] = 0;
                    }

                    d = d / 2;
                }
            }
            for (int i = 31; i >= 0; i -= 4) {
                hex = hex + ins[i] * 8;
                hex = hex + ins[i - 1] * 4;
                hex = hex + ins[i - 2] * 2;
                hex = hex + ins[i - 3] * 1;
                if (hex == 10)
                    printf("a");
                else if (hex == 11)
                    printf("b");
                else if (hex == 12)
                    printf("c");
                else if (hex == 13)
                    printf("d");
                else if (hex == 14)
                    printf("e");
                else if (hex == 15)
                    printf("f");
                else
                    printf("%d", hex);
                hex = 0;
            }
            for (int i = 6; i >=0; i--) {
                if (ins[i] == 1)
                    op.append("1");
                else if (ins[i] == 0)
                    op.append("0");
            }
            cout << endl << op << endl;
            //work(find(op), ins);
            printf("n");
        }
    }
}
}

int main(int argc, char* argv[])
{
ifstream in;

in.open(argv[1], ios::in | ios::binary);
if (in.is_open())
{
    // get the starting position
    streampos start = in.tellg();

    // go to the end
    in.seekg(0, std::ios::end);

    // get the ending position
    streampos end = in.tellg();

    // go back to the start
    in.seekg(0, std::ios::beg);

    // create a vector to hold the data that
    // is resized to the total size of the file    
    std::vector<char> contents;
    contents.resize(static_cast<size_t>(end - start));

    // read it in
    in.read(&contents[0], contents.size());

    // print it out (for clarity)
    hexdump(contents.data(), contents.size());
}
in.close();
return 0;
}
string find(char op[7]) {
   string inst("unknown instruction");
   if(op=="")
   return inst;
}
void work(string inst, short* ins);