func getWindowText(hwnd C.HWND) string {
// WM_GETTEXTLENGTH and WM_GETTEXT return the count /without/ the terminating null character
// but WM_GETTEXT expects the buffer size handed to it to /include/ the terminating null character
n := C.getWindowTextLen(hwnd)
buf := make([]uint16, int(n+1))
C.getWindowText(hwnd, C.WPARAM(n),
C.LPWSTR(unsafe.Pointer(&buf[0])))
return syscall.UTF16ToString(buf)
}
func (*keychainWindows) AddPassword(service, account, password string) error {
// Validate input
serviceValid := isValidNonNullUTF8(service)
accountValid := isValidNonNullUTF8(account)
passwordValid := isValidNonNullUTF8(password)
if !(serviceValid && accountValid && passwordValid) {
return ErrInvalidValue
}
// Compute target item name
target := targetFormat(service, account)
// Convert the target name. We require that inputs be in UTF-8, but even
// then we can't use these using the Windows ANSI (A) APIs, so we have to
// use the Unicode (W) APIs, but these all use UTF-16, we we need to
// generate UTF-16 views of our strings. Fortunately, the Windows syscall
// package has a nice API for doing this.
targetUTF16Ptr, err := syscall.UTF16PtrFromString(target)
if err != nil {
return ErrInvalidValue
}
targetUTF16 := C.LPWSTR(unsafe.Pointer(targetUTF16Ptr))
// Convert the password blob. This is just stored as a raw array of bytes,
// so we can store it UTF-8 encoded.
passwordBlobSize := C.DWORD(len(password))
passwordVoidBlob := unsafe.Pointer(C.CString(password))
defer C.free(passwordVoidBlob)
passwordBlob := C.LPBYTE(passwordVoidBlob)
// Set up the credential
var credential C.CREDENTIALW
credential.Type = C.CRED_TYPE_GENERIC
credential.TargetName = targetUTF16
credential.CredentialBlobSize = passwordBlobSize
credential.CredentialBlob = passwordBlob
credential.Persist = C.CRED_PERSIST_LOCAL_MACHINE
// Store the credential
if C.CredWriteW(&credential, 0) != C.TRUE {
return ErrUnknown
}
// All done
return nil
}
func toUTF16(s string) C.LPWSTR {
return C.LPWSTR(unsafe.Pointer(syscall.StringToUTF16Ptr(s)))
}