文件存在,但打开的文件始终返回-1 [英] File exists, but open file still always returns -1
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问题描述
文件〜/ workspace / Test.txt确实存在,但fd总是返回-1。有人可以提供一个提示,什么是错误的代码?感谢。
File "~/workspace/Test.txt" does exist, but fd always returns -1. Can somebody please give a hint as to what is wrong with the code? Thanks.
int fd = open("~/workspace/Test.txt", O_RDONLY);
cout << "fd is "<<fd<<endl;
if (fd < 0) {
cout << "did not find file"<<endl;
return false;
}
推荐答案
Posix like Linux)
(Assuming your OS is some Posix like Linux)
应该扩展〜
。通常壳膨胀它。但打开
需要一个真实的文件路径。
The ~
should be expanded. Usually the shell expands it. But open
wants a real file path.
您可以尝试:
std::string fname (getenv("HOME"));
fname += "/workspace/Test.txt";
int fd = open(fname.c_str(), O_RDONLY);
if (fd<0) {
std::cerr << "failed to open " << fname
<< " : " << strerror(errno) << std::endl;
return false;
}
请参阅 glob(7), wordexp(3), getenv(3), strerror(3),打开(2), environ(7)
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