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curl -Os https://raw.githubusercontent.com/vlang/vc/master/v.c cc -std=gnu11 -w -o v v.c -lm ccK5ic4o.o:v.c:(.text+0x6f62): undefined reference to `__imp_gethostname' collect2.exe: error: ld returned 1 exit status
91 lines
2.8 KiB
Go
91 lines
2.8 KiB
Go
module os
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#flag -lws2_32
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#include <winsock2.h>
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const (
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PathSeparator = '\\'
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)
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// Ref - https://docs.microsoft.com/en-us/windows/desktop/winprog/windows-data-types
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// 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
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// get_file_handle retrieves the operating-system file handle that is associated with the specified file descriptor.
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pub fn get_file_handle(path string) HANDLE {
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mode := 'rb'
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_fd := C.fopen(path.cstr(), mode.cstr())
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if _fd == 0 {
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return HANDLE(INVALID_HANDLE_VALUE)
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}
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_handle := C._get_osfhandle(C._fileno(_fd)) // CreateFile? - hah, no -_-
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return _handle
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}
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// Ref - https://docs.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-getmodulefilenamea
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// get_module_filename retrieves the fully qualified path for the file that contains the specified module.
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// The module must have been loaded by the current process.
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pub fn get_module_filename(handle HANDLE) ?string {
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mut sz := int(1024) // Optimized length
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mut buf := [byte(0); sz] // Not work for GetModuleFileNameW :(
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for {
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status := C.GetModuleFileName(handle, &buf, sz)
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switch status {
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case SUCCESS:
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_filename := tos(buf.data, sz)
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return _filename
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case ERROR_INSUFFICIENT_BUFFER:
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sz += 1024 // increment buffer cluster by 1024
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buf = [byte(0); sz] // clear buffer
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default:
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// Must handled with GetLastError and converted by FormatMessage
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return error('Cannot get file name from handle.')
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}
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}
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}
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// Ref - https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-formatmessagea#parameters
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const (
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FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100
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FORMAT_MESSAGE_ARGUMENT_ARRAY = 0x00002000
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FORMAT_MESSAGE_FROM_HMODULE = 0x00000800
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FORMAT_MESSAGE_FROM_STRING = 0x00000400
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FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000
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FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200
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)
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// Ref - winnt.h
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const (
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SUBLANG_NEUTRAL = 0x00
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SUBLANG_DEFAULT = 0x01
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LANG_NEUTRAL = (SUBLANG_NEUTRAL)
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)
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// Ref - https://docs.microsoft.com/en-us/windows/win32/debug/system-error-codes--12000-15999-
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const (
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MAX_ERROR_CODE = 15841 // ERROR_API_UNAVAILABLE
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)
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fn ptr_get_error_message(code u32) voidptr {
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mut buf := voidptr(0)
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// Check for code overflow
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if code > u32(MAX_ERROR_CODE) {
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return buf
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}
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C.FormatMessage(
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FORMAT_MESSAGE_ALLOCATE_BUFFER
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| FORMAT_MESSAGE_FROM_SYSTEM
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| FORMAT_MESSAGE_IGNORE_INSERTS,
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0, code, C.MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), &buf, 0, 0)
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return buf
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}
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pub fn get_error_msg(code u32) string {
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_ptrdata := ptr_get_error_message(code)
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if _ptrdata == voidptr(0) {
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return ''
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}
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return tos(_ptrdata, C.strlen(_ptrdata))
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}
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