1.
c代码中通过lua_push 把数据压入堆栈,lua调用c函数得到数据。luaL_check是对lua_to的封装，从堆栈中获取lua代码中函数调用的数据。
static int
lread(lua_State *L) {
struct socket * s = lua_touserdata(L,1);
if (s == NULL || s->listen_fd < 0) {
return luaL_error(L, "start socket first");
}
size_t sz = 0;
const char * welcome = luaL_checklstring(L,2,&sz);
int fd = test(s, welcome,sz);
if (fd >= 0) {
char buffer[BUFFER_SIZE];
int rd = recv(fd, buffer, BUFFER_SIZE, 0);
if (rd <= 0) {
s->closed = 1;
lua_pushboolean(L, 0);
return 1;
}
lua_pushlstring(L, buffer, rd);
return 1;
}
return 0;
}
static int
lstart(lua_State *L) {
const char * addr = luaL_checkstring(L,1);
int port = luaL_checkinteger(L,2);
struct socket * s = lua_newuserdata(L, sizeof(*s));
s->listen_fd = -1;
s->fd = -1;
s->closed = 0;
int lfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
int reuse = 1;
setsockopt(s->listen_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&reuse, sizeof(int));
struct sockaddr_in service;
service.sin_family = AF_INET;
service.sin_addr.s_addr = inet_addr(addr);
service.sin_port = htons(port);
if (bind(lfd, (const struct sockaddr *)&service, sizeof(service)) < 0) {
closesocket(lfd);
printf("bind() failed");
exit(1);
}
if (listen(lfd, 1) < 0) {
printf("listen(): Error");
exit(1);
}
s->listen_fd = lfd;
return 1;
}
function ldebug.start(host)
local ip = (host and host.ip) or "127.0.0.1"
local port = (host and host.port) or 6789
socks_fd = csock.start(ip , port)
end
function readline()
local ret = split()
if ret then
return ret
end
local data = csock.read(socks_fd, socks_prompt)
if data then
socks_buffer = socks_buffer .. data
return split()
end
return data
end
2.stack
lua_pushnumber( L, 211 );
lua_pushnumber( L, 2222 );
lua_newtable( L );
执行代码,跟踪L的top，发现top的地址是增加的。
(StkId) top = 0x00007f9c63d01730
(StkId) top = 0x00007f9c63d01740
(StkId) top = 0x00007f9c63d01750
(StkId) top = 0x00007f9c63d01760
所以
那么当执行完lua_newtable之后栈上有三个元素，大致就是这样：
table
222
211
现在211是第一个元素，index为1，不过LUA也可以用负数来表示，那么现在他是多少？
index -index value
3 -1 table
2 -2 222
1 -3 211
3.quick
17 ls /Users/temp/Downloads/quick-cocos2d-x
18 export
19 export QUICK_COCOS2DX_ROOT=/Users/temp/Downloads/quick-cocos2d-x
20 echo $(QUICK_COCOS2DX_ROOT)
21 $(QUICK_COCOS2DX_ROOT)
22 echo $(QUICK_COCOS2DX_ROOT)
23 cd /Users/temp/Downloads/quick-cocos2d-x/bin
24 ./create_project.sh -o landscape com.Reventon.Game.testGame
25 ./create_project.sh
26 ./create_project.sh -h
27 ./create_project.sh -r landscape com.Reventon.Game.testGame
28 ./create_project.sh -r landscape -p com.Reventon.Game.testGame
29 ls
30 testgame/run-mac.sh
31 testgame/run-mac.sh
32 testgame/run-mac.sh
33 testgame/run-mac.sh
ui.newTTFLabelMenuItem
lua调用c/c++时，c/c++语言的函数参数一般只有char *,float,int等基础类型，没有字典类型。
lua代码的函数参数可以是table,function,所以一般会封装一个函数调用c/c++，这样lua代码调用lua函数传递table,lua函数内部调用c/c++。
function ldebug.start(host)
local ip = (host and host.ip) or "127.0.0.1"
local port = (host and host.port) or 6789
socks_fd = csock.start(ip , port)
end
ldebug.start { ip = "127.0.0.1", port = 6789 }
static int
lstart(lua_State *L) {
const char * addr = luaL_checkstring(L,1);
int port = luaL_checkinteger(L,2);
struct socket * s = lua_newuserdata(L, sizeof(*s));
s->listen_fd = -1;
s->fd = -1;
s->closed = 0;
int lfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
int reuse = 1;
setsockopt(s->listen_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&reuse, sizeof(int));
struct sockaddr_in service;
service.sin_family = AF_INET;
service.sin_addr.s_addr = inet_addr(addr);
service.sin_port = htons(port);
if (bind(lfd, (const struct sockaddr *)&service, sizeof(service)) < 0) {
closesocket(lfd);
printf("bind() failed");
exit(1);
}
if (listen(lfd, 1) < 0) {
printf("listen(): Error");
exit(1);
}
s->listen_fd = lfd;
return 1;
}
--[[--
使用 TTF 字体创建文字显示对象，并返回 CCLabelTTF 对象。
可用参数：
- text: 要显示的文本
- font: 字体名，如果是非系统自带的 TTF 字体，那么指定为字体文件名
- size: 文字尺寸，因为是 TTF 字体，所以可以任意指定尺寸
- color: 文字颜色（可选），用 ccc3() 指定，默认为白色
- align: 文字的水平对齐方式（可选）
- valign: 文字的垂直对齐方式（可选），仅在指定了 dimensions 参数时有效
- dimensions: 文字显示对象的尺寸（可选），使用 CCSize() 指定
- x, y: 坐标（可选）
align 和 valign 参数可用的值：
- ui.TEXT_ALIGN_LEFT 左对齐
- ui.TEXT_ALIGN_CENTER 水平居中对齐
- ui.TEXT_ALIGN_RIGHT 右对齐
- ui.TEXT_VALIGN_TOP 垂直顶部对齐
- ui.TEXT_VALIGN_CENTER 垂直居中对齐
- ui.TEXT_VALIGN_BOTTOM 垂直底部对齐
~~~ lua
-- 创建一个居中对齐的文字显示对象
local label = ui.newTTFLabel({
text = "Hello, World",
font = "Marker Felt",
size = 64,
align = ui.TEXT_ALIGN_CENTER -- 文字内部居中对齐
})
-- 左对齐，并且多行文字顶部对齐
local label = ui.newTTFLabel({
text = "Hello, World\n您好，世界",
font = "Arial",
size = 64,
color = ccc3(255, 0, 0), -- 使用纯红色
align = ui.TEXT_ALIGN_LEFT,
valign = ui.TEXT_VALIGN_TOP,
dimensions = CCSize(400, 200)
})
~~~
@param table params 参数表格对象
@return CCLabelTTF CCLabelTTF对象
]]
function ui.newTTFLabel(params)
assert(type(params) == "table",
"[framework.ui] newTTFLabel() invalid params")
local text = tostring(params.text)
local font = params.font or ui.DEFAULT_TTF_FONT
local size = params.size or ui.DEFAULT_TTF_FONT_SIZE
local color = params.color or display.COLOR_WHITE
local textAlign = params.align or ui.TEXT_ALIGN_LEFT
local textValign = params.valign or ui.TEXT_VALIGN_CENTER
local x, y = params.x, params.y
local dimensions = params.dimensions
assert(type(size) == "number",
"[framework.ui] newTTFLabel() invalid params.size")
local label
if dimensions then
label = CCLabelTTF:create(text, font, size, dimensions, textAlign, textValign)
else
label = CCLabelTTF:create(text, font, size)
end
if label then
label:setColor(color)
function label:realign(x, y)
if textAlign == ui.TEXT_ALIGN_LEFT then
label:setPosition(math.round(x + label:getContentSize().width / 2), y)
elseif textAlign == ui.TEXT_ALIGN_RIGHT then
label:setPosition(x - math.round(label:getContentSize().width / 2), y)
else
label:setPosition(x, y)
end
end
if x and y then label:realign(x, y) end
end
return label
end
