59 lines
1.5 KiB
Go
59 lines
1.5 KiB
Go
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// 12 july 2014
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package ui
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import (
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"fmt"
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"reflect"
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"syscall"
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"unsafe"
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)
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// #include "winapi_windows.h"
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import "C"
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//export xpanic
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func xpanic(msg *C.char, lasterr C.DWORD) {
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panic(fmt.Errorf("%s: %s", C.GoString(msg), syscall.Errno(lasterr)))
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}
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//export xpanichresult
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func xpanichresult(msg *C.char, hresult C.HRESULT) {
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panic(fmt.Errorf("%s; HRESULT: 0x%X", C.GoString(msg), hresult))
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}
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//export xpaniccomdlg
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func xpaniccomdlg(msg *C.char, err C.DWORD) {
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panic(fmt.Errorf("%s; comdlg32.dll extended error: 0x%X", C.GoString(msg), err))
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}
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//export xmissedmsg
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func xmissedmsg(purpose *C.char, f *C.char, uMsg C.UINT) {
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panic(fmt.Errorf("%s window procedure message %d does not return a value (bug in %s)", C.GoString(purpose), uMsg, C.GoString(f)))
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}
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func toUTF16(s string) C.LPWSTR {
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return C.LPWSTR(unsafe.Pointer(syscall.StringToUTF16Ptr(s)))
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}
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func getWindowText(hwnd C.HWND) string {
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// WM_GETTEXTLENGTH and WM_GETTEXT return the count /without/ the terminating null character
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// but WM_GETTEXT expects the buffer size handed to it to /include/ the terminating null character
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n := C.getWindowTextLen(hwnd)
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buf := make([]uint16, int(n+1))
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C.getWindowText(hwnd, C.WPARAM(n),
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C.LPWSTR(unsafe.Pointer(&buf[0])))
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return syscall.UTF16ToString(buf)
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}
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func wstrToString(wstr *C.WCHAR) string {
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n := C.wcslen((*C.wchar_t)(unsafe.Pointer(wstr)))
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xbuf := &reflect.SliceHeader{
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Data: uintptr(unsafe.Pointer(wstr)),
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Len: int(n + 1),
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Cap: int(n + 1),
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}
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buf := (*[]uint16)(unsafe.Pointer(xbuf))
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return syscall.UTF16ToString(*buf)
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}
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