相关疑难解决方法(0)

我正在寻找解决上述问题的解决方案.

这是我的"不工作代码".charsInCurrentBuffer总是返回-1!

#define BUFSIZE 512

char *bufferA = new char[BUFSIZE];
char *bufferB = new char[BUFSIZE];

const char *inputFile = "in.txt";

if ( (fdInputFile = open(inputFile, O_DIRECT) ) != -1) {
    cout << "input opened!" << endl;
} else {
    cout << "can't open input file!";
}

int charsInCurrentBuffer = read(fdInputFile, currBuffer, BUFSIZE);
cout << charsInCurrentBuffer << endl;