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v/vlib/os/os_win.v

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module os
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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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// 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.fopen(path.cstr(), mode.cstr())
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 {
mut sz := int(1024) // Optimized length
mut buf := [byte(0); sz] // Not work for GetModuleFileNameW :(
for {
status := C.GetModuleFileName(handle, &buf, sz)
switch status {
case SUCCESS:
_filename := tos(buf.data, sz)
return _filename
case ERROR_INSUFFICIENT_BUFFER:
sz += 1024 // increment buffer cluster by 1024
buf = [byte(0); sz] // clear buffer
default:
// Must handled with GetLastError and converted by FormatMessage
return error('Cannot get file name from handle.')
}
}
}
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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)
)
fn ptr_get_error_message(code u32) voidptr {
mut buf := voidptr(0)
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
}
pub fn get_error_msg(code u32) string {
_ptrdata := ptr_get_error_message(code)
return tos(_ptrdata, C.strlen(_ptrdata))
}