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v/vlib/os/os_win.v

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module os
// 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.')
}
}
}