window之 WM_COPYDATA

wchar_t winCaption[_MAX_PATH] = { 0 };

        caption.toWCharArray(winCaption);

        HWND receiveWindow = ::FindWindow(NULL, winCaption);

        if (receiveWindow == NULL)

            break;

        wchar_t data[_MAX_PATH] = { 0 };

        int length = filePath.toWCharArray(data);

        COPYDATASTRUCT copyData = { 0 };

        copyData.lpData = data;

        copyData.cbData = (length + 1) * sizeof(wchar_t);
        ::SendMessage(receiveWindow, WM_COPYDATA, (WPARAM)winId(), (LPARAM)©Data);

注意在vista,win7不同进程中，需要过滤消息。