[英]c++ How do I find length of buffer in non-windows platforms using fread()
I have a function using ReadFile() where I append a '\0' at the end of the buffer:我有一个 function 使用 ReadFile() 其中我 append 在缓冲区的末尾有一个 '\0' :
HANDLE InFile;
FILE* InputFile;
DWRD len = ftell(InputFile);
buffer = new BYTE[len + 1];
if (ReadFile(InFile, buffer , len, &len2, NULL))
{
...
buffer [len2] = 0;
}
Now I want to adapt this function for use with non-windows platforms.现在我想调整这个 function 以用于非 Windows 平台。 I already changed ReadFile() and use fread() now.我已经更改了 ReadFile() 并现在使用 fread()。 But then I do not have len2 available which I would like to use for appending the '\0':但是我没有 len2 可用,我想用它来附加“\ 0”:
FILE* InputFile;
DWRD len = ftell(InputFile);
buffer = new BYTE[len + 1];
if (fread(buffer ,1,len,InputFile))
{
// how can I find the length of the buffer (len2) now ?
buffer [len2] = 0; // Does not work !
...
}
How can I get the position of the end of my buffer?如何获得缓冲区末尾的 position?
fread()
returns the numbers of items actually read, eg: fread()
返回实际读取的项目数,例如:
FILE* InputFile;
...
DWORD len = ftell(InputFile);
buffer = new BYTE[len + 1];
size_t len2;
if ((len2 = fread(buffer, 1, len, InputFile)) > 0)
{
buffer [len2] = 0;
...
}
else
{
// use feof() and ferror() to check for errors...
}
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