Test UNC

gistfile1.txt

#include <iostream>
#include <io.h>
#include <fcntl.h>
#include <Windows.h>

void print_last_error()
{
    LPVOID lpMsgBuf;
    DWORD dw = GetLastError();

    FormatMessage(
        FORMAT_MESSAGE_ALLOCATE_BUFFER |
        FORMAT_MESSAGE_FROM_SYSTEM |
        FORMAT_MESSAGE_IGNORE_INSERTS,
        NULL,
        dw,
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
        (LPTSTR)&lpMsgBuf,
        0, NULL);

    std::cout << "code: " << dw << ", msg: " << (LPTSTR)lpMsgBuf;
}

int main()
{
    const char* file_path = "Z:\\Temp\\Test.txt";
    HANDLE handle = CreateFile(file_path, FILE_APPEND_DATA,
        FILE_SHARE_WRITE | FILE_SHARE_READ,
        NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if (handle == INVALID_HANDLE_VALUE)
    {
        print_last_error();
        exit(-1);
    }
    char buf[64] = "test";
    int fd = _open_osfhandle((intptr_t)handle, O_BINARY);
    int ret = _write(fd, buf, strlen(buf));
    if (ret <= 0)
    {
        print_last_error();
        exit(-1);
    }
}