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v/vlib/os/os_win.v

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module os
#flag -lws2_32
#include <winsock2.h>
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const (
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PathSeparator = '\\'
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)
// Ref - https://docs.microsoft.com/en-us/windows/desktop/winprog/windows-data-types
// A handle to an object.
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type HANDLE voidptr
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pub fn ls(path string) []string {
mut find_file_data := win32finddata{}
mut dir_files := []string
// We can also check if the handle is valid. but using dir_exists instead
// h_find_dir := C.FindFirstFile(path.str, &find_file_data)
// if (INVALID_HANDLE_VALUE == h_find_dir) {
// return dir_files
// }
// C.FindClose(h_find_dir)
if !dir_exists(path) {
println('ls() couldnt open dir "$path" (does not exist).')
return dir_files
}
// NOTE: Should eventually have path struct & os dependant path seperator (eg os.PATH_SEPERATOR)
// we need to add files to path eg. c:\windows\*.dll or :\windows\*
path_files := '$path\\*'
// NOTE:TODO: once we have a way to convert utf16 wide character to utf8
// we should use FindFirstFileW and FindNextFileW
h_find_files := C.FindFirstFile(path_files.to_wide(), &find_file_data)
first_filename := string_from_wide(&u16(find_file_data.cFileName))
if first_filename != '.' && first_filename != '..' {
dir_files << first_filename
}
for C.FindNextFile(h_find_files, &find_file_data) {
filename := string_from_wide(&u16(find_file_data.cFileName))
if filename != '.' && filename != '..' {
dir_files << filename.clone()
}
}
C.FindClose(h_find_files)
return dir_files
}
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// Ref - https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/get-osfhandle?view=vs-2019
// get_file_handle retrieves the operating-system file handle that is associated with the specified file descriptor.
pub fn get_file_handle(path string) HANDLE {
mode := 'rb'
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_fd := C._wfopen(path.to_wide(), mode.to_wide())
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if _fd == 0 {
return HANDLE(INVALID_HANDLE_VALUE)
}
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_handle := C._get_osfhandle(C._fileno(_fd)) // CreateFile? - hah, no -_-
return _handle
}
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// Ref - https://docs.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-getmodulefilenamea
// get_module_filename retrieves the fully qualified path for the file that contains the specified module.
// The module must have been loaded by the current process.
pub fn get_module_filename(handle HANDLE) ?string {
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mut sz := int(4096) // Optimized length
mut buf := &u16(malloc(4096))
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for {
status := C.GetModuleFileName(handle, &buf, sz)
switch status {
case SUCCESS:
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_filename := string_from_wide2(buf, sz)
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return _filename
default:
// Must handled with GetLastError and converted by FormatMessage
return error('Cannot get file name from handle.')
}
}
panic('this should be unreachable') // TODO remove unreachable after loop
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}
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// Ref - https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-formatmessagea#parameters
const (
FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100
FORMAT_MESSAGE_ARGUMENT_ARRAY = 0x00002000
FORMAT_MESSAGE_FROM_HMODULE = 0x00000800
FORMAT_MESSAGE_FROM_STRING = 0x00000400
FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000
FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200
)
// Ref - winnt.h
const (
SUBLANG_NEUTRAL = 0x00
SUBLANG_DEFAULT = 0x01
LANG_NEUTRAL = (SUBLANG_NEUTRAL)
)
// Ref - https://docs.microsoft.com/en-us/windows/win32/debug/system-error-codes--12000-15999-
const (
MAX_ERROR_CODE = 15841 // ERROR_API_UNAVAILABLE
)
// ptr_win_get_error_msg return string (voidptr)
// representation of error, only for windows.
fn ptr_win_get_error_msg(code u32) voidptr {
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mut buf := voidptr(0)
// Check for code overflow
if code > u32(MAX_ERROR_CODE) {
return buf
}
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C.FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER
| FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_IGNORE_INSERTS,
0, code, C.MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), &buf, 0, 0)
return buf
}
// get_error_msg return error code representation in string.
pub fn get_error_msg(code int) string {
if code < 0 { // skip negative
return ''
}
_ptr_text := ptr_win_get_error_msg(u32(code))
if _ptr_text == 0 { // compare with null
return ''
}
return tos(_ptr_text, C.strlen(_ptr_text))
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}