이진 데이터를 읽고 unsigned char (C++)로 캐스팅하는 방법

Question

이진 데이터 (인코딩 없음)로 저장된 원시 이미지 파일이 있습니다. 파일을 읽고 값을 부호없는 char로 캐스팅하고 싶습니다. 하지만이 일을 시작하는 방법을 잘 모르겠습니다. 각 파일에는 640x480 바이트가 들어 있습니다. 각 픽셀은 8 비트입니다.

여기에 C++ 도움말 페이지를 사용했습니다 : http://www.cplusplus.com/doc/tutorial/files/, 그러나 내가 데이터를 요구할 때 동일한 바이너리/사람이 읽을 수없는 문자가 표시되는 것 같습니다. 누군가 조언 해 줄 수 있습니까? 여기

#include <iostream> 
    #include <fstream> 
    using namespace std; 

ifstream::pos_type size; 
char * memblock; 

int main() { 
    ifstream file ("imageData.raw", ios::in|ios::binary|ios::ate); 
    if (file.is_open()) 
    { 
    size = file.tellg(); 
    memblock = new char [size]; 
    file.seekg (0, ios::beg); 
    file.read (memblock, size); 

    cout << "the complete file content is in memory"; 

    for (int l=0; l<size; l++){ 
    cout << " memblock[] is = " << (unsigned char)memblock[l] << " index was l = " << l << endl; 
    } 

    file.close(); 


    delete[] memblock; 
    } 
    else cout << "Unable to open file"; 
    return 0; 
} 

샘플 출력 캡처됩니다 :

memblock[] is = ▀ index was l = 2937 
memblock[] is = E index was l = 2938 
memblock[] is = τ index was l = 2939 
memblock[] is = C index was l = 2940 
memblock[] is = ┘ index was l = 2941 
memblock[] is = B index was l = 2942 
memblock[] is = ╬ index was l = 2943 
memblock[] is = D index was l = 2944 
memblock[] is = ┼ index was l = 2945 
memblock[] is = C index was l = 2946 
memblock[] is = ╝ index was l = 2947 
memblock[] is = B index was l = 2948 
memblock[] is = ┤ index was l = 2949 
memblock[] is = B index was l = 2950 
memblock[] is = ¿ index was l = 2951 
memblock[] is = > index was l = 2952 
memblock[] is = í index was l = 2953 
memblock[] is = ; index was l = 2954 
memblock[] is = £ index was l = 2955 
memblock[] is = 6 index was l = 2956 
memblock[] is = á index was l = 2957 
memblock[] is = 4 index was l = 2958 
memblock[] is = Ñ index was l = 2959 
memblock[] is = 7 index was l = 2960 
memblock[] is = ╡ index was l = 2961 

Answer 1

unsigned char* memblock; // change declaration of memblock 

... 

memblock = new unsigned char[size]; // change to unsigned char 
file.seekg (0, ios::beg); 
file.read ((char*)memblock, size); // cast to a char* to give to file.read 

인쇄하기 전에 int 캐스트 대신 문자의 숫자 값을 인쇄하려면 여기에 지금까지 내 코드입니다.

(int) memblock[l]