/* 17 july 2014 */ #include "winapi_windows.h" #include "_cgo_export.h" void uimsgloop(void) { MSG msg; int res; for (;;) { SetLastError(0); res = GetMessageW(&msg, NULL, 0, 0); if (res < 0) xpanic("error calling GetMessage()", GetLastError()); if (res == 0) /* WM_QUIT */ break; /* TODO IsDialogMessage() */ TranslateMessage(&msg); DispatchMessageW(&msg); } } void issue(void *request) { SetLastError(0); if (PostMessageW(msgwin, msgRequest, 0, (LPARAM) request) == 0) xpanic("error issuing request", GetLastError()); } HWND msgwin; #define msgwinclass L"gouimsgwin" static LRESULT CALLBACK msgwinproc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { switch (uMsg) { case WM_COMMAND: return forwardCommand(hwnd, uMsg, wParam, lParam); case WM_NOTIFY: return forwardNotify(hwnd, uMsg, wParam, lParam); case msgRequest: doissue((void *) lParam); return 0; default: return DefWindowProcW(hwnd, uMsg, wParam, lParam); } xmissedmsg("message-only", "msgwinproc()", uMsg); return 0; /* unreachable */ } DWORD makemsgwin(char **errmsg) { WNDCLASSW wc; HWND hwnd; ZeroMemory(&wc, sizeof (WNDCLASSW)); wc.lpfnWndProc = msgwinproc; wc.hInstance = hInstance; wc.hIcon = hDefaultIcon; wc.hCursor = hArrowCursor; wc.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1); wc.lpszClassName = msgwinclass; if (RegisterClassW(&wc) == 0) { *errmsg = "error registering message-only window classs"; return GetLastError(); } msgwin = CreateWindowExW( 0, msgwinclass, L"package ui message-only window", 0, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, HWND_MESSAGE, NULL, hInstance, NULL); if (msgwin == NULL) { *errmsg = "error creating message-only window"; return GetLastError(); } return 0; }