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我被这个 EXC_BAD_ACCESS 错误难住了。我正在使用 zlib 将数组 ch 中的一些数据压缩并保存在函数 deflateReadOut 中,该函数从函数 generate 中调用。程序在标记行的 fwrite 处失败。

class WSUMap {
public:


vector<vector <unsigned char> > chunk;
int xComp[4];
int yComp[4];
vector<int> priority;
Hash hashChunk;

WSUMap()
{
    chunk.resize(4);
    chunk[0] = vector<unsigned char>(CHUNK);
    chunk[1] = vector<unsigned char>(CHUNK);
    chunk[2] = vector<unsigned char>(CHUNK);
    chunk[3] = vector<unsigned char>(CHUNK);
    priority.push_back(0);
    priority.push_back(1);
    priority.push_back(2);
    priority.push_back(3);
    xComp[0] = -1;
    xComp[1] = -1;
    xComp[2] = -1;
    xComp[3] = -1;
    yComp[0] = -1;
    yComp[1] = -1;
    yComp[2] = -1;
    yComp[3] = -1;
}

void generate() {
    for (int i = 0; i<CHUNK; i++) {
        chunk[0][i]=100;
    }
    for (int i = 0; i < 16; i++) {
        for (int j = 0; j < 16; j++) {
            cout << chunk[0][0] << endl;
            unsigned char* ch = &chunk[0][0];
            cout << ch[0] << endl;
            deflateReadOut(i, j, &chunk[0][0]);
        }
    }
}

void deflateReadOut(int x, int y, unsigned char* ch) {
    int ret, flush;
    unsigned have;
    z_stream strm;
    vector<unsigned char> out = vector<unsigned char>(CHUNK);
    out.resize(CHUNK);

    /* allocate deflate state */
    strm.zalloc = Z_NULL;
    strm.zfree = Z_NULL;
    strm.opaque = Z_NULL;
    ret = deflateInit(&strm, Z_DEFAULT_COMPRESSION);
    if (ret != Z_OK) assert(true);
    //return ret;

    ostringstream oss;
    oss << "map/" << x << "x" << y;
    string str = oss.str();
    cout << str << endl;
    FILE* dest = fopen(str.c_str(), "w");

    /* run deflate() on input until output buffer not full, finish
       compression if all of source has been read in */
    do {
        strm.avail_out = CHUNK;
        strm.avail_in = CHUNK;
        strm.next_in = ch;
        strm.next_out = &out[0];

        ret = deflate(&strm, Z_FINISH); /* no bad return value */
        assert(ret != Z_STREAM_ERROR); /* state not clobbered */

        have = CHUNK - strm.avail_out;
        if (fwrite(&out[0], 1, have, dest) != have || ferror(dest)) {//ERROR HERE
            (void) deflateEnd(&strm);
            //return Z_ERRNO;
        }

    } while (strm.avail_out == 0);
    assert(strm.avail_in == 0); /* all input will be used */

    /* clean up and return */
    (void) deflateEnd(&strm);
}

感谢您提供任何帮助。

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1 回答 1

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我想到了。我试图写入一个不存在的目录,我认为如果它不存在它会自动创建它。

于 2013-04-10T23:38:39.167 回答