int（long） 类型转换为char

#include <stdio.h>

int IntToChar(int tmp, char  buffer[4])
{
    buffer[0] = (char)tmp;
    buffer[1] = (char)(tmp >> 8);
    buffer[2] = (char)(tmp >> 16);
    buffer[3] = (char)(tmp >> 24);

    return 0;
}

int main()
{
    unsigned int tmp = 0x18345679;
    char buffer[4] = {0};
    int  i = 0;

    IntToChar(tmp, buffer);

    for(i = 0; i < 4;i++)
    {
        printf("buffer[%d] = %02x\n",i, buffer[i]);
    }
    getchar();
    return 0;
}