編程key
① maprece編程模型鍵值對的key必須實現哪個介面
writablecomparable介面。
MapRece中的key類散好陵型必須實現WritableComparable介面,為了方便用戶襪旅使用,Hadoop提供有一些內置的沖戚key類型。
常見的key類型有IntWritable、LongWritable、Text、FloatWritable等。
② c語言中是什麼意思,Key
key 英[ki:] 美[ki]
n. 鑰匙; (打字機等的) 鍵; 關鍵,線索,秘訣; (音樂的) 調;
vt. 鍵入; 鎖上; 調節…的音調; 提供線索;
vi. 使用鑰匙;
[例句]They put the key in the door and entered
他們用鑰匙打開門進去了。
[其他] 第三人稱單數:keys 復數:keys 現在分詞:keying 過去式:keyed過去分詞:keyed
③ 在c語言中 這一句 key ( ) 是什麼意思
在數據結構里倒是經常接觸key,例如keytype
key,表示的是用戶自己定義的變數類型,不過你這個key()可以是你自己定義的一個什麼函數吧,如果是一個無參數返回的函數應該是void
key();哎,同感,問的太「簡潔」了
④ C51編程,key=P0&0X0f是什麼意思
&按位與
P0&0x0f,這樣只要看P0低4位肆猛塌雀,只裂衫橋要低4為是1111,那麼結果key就是0x0f。
⑤ 編程注冊快捷鍵 鍵盤鍵值對照表
public enum Keys
{
KeyCode = 65535, // 0x0000FFFF
Modifiers = -65536, // -0x00010000
None = 0,
LButton = 1,
RButton = 2,
Cancel = RButton | LButton, // 0x00000003
MButton = 4,
XButton1 = MButton | LButton, // 0x00000005
XButton2 = MButton | RButton, // 0x00000006
Back = 8,
Tab = Back | LButton, // 0x00000009
LineFeed = Back | RButton, // 0x0000000A
Clear = Back | MButton, // 0x0000000C
Return = Clear | LButton, // 0x0000000D
Enter = Return, // 0x0000000D
ShiftKey = 16, // 0x00000010
ControlKey = ShiftKey | LButton, // 0x00000011
Menu = ShiftKey | RButton, // 0x00000012
Pause = Menu | LButton, // 0x00000013
Capital = ShiftKey | MButton, // 0x00000014
CapsLock = Capital, // 0x00000014
KanaMode = CapsLock | LButton, // 0x00000015
HanguelMode = KanaMode, // 0x00000015
HangulMode = HanguelMode, // 0x00000015
JunjaMode = HangulMode | RButton, // 0x00000017
FinalMode = ShiftKey | Back, // 0x00000018
HanjaMode = FinalMode | LButton, // 0x00000019
KanjiMode = HanjaMode, // 0x00000019
Escape = KanjiMode | RButton, // 0x0000001B
IMEConvert = FinalMode | MButton, // 0x0000001C
IMENonconvert = IMEConvert | LButton, // 0x0000001D
IMEAccept = IMEConvert | RButton, // 0x0000001E
IMEAceept = IMEAccept, // 0x0000001E
IMEModeChange = IMEAceept | LButton, // 0x0000001F
Space = 32, // 0x00000020
Prior = Space | LButton, // 0x00000021
PageUp = Prior, // 0x00000021
Next = Space | RButton, // 0x00000022
PageDown = Next, // 0x00000022
End = PageDown | LButton, // 0x00000023
Home = Space | MButton, // 0x00000024
Left = Home | LButton, // 0x00000025
Up = Home | RButton, // 0x00000026
Right = Up | LButton, // 0x00000027
Down = Space | Back, // 0x00000028
Select = Down | LButton, // 0x00000029
Print = Down | RButton, // 0x0000002A
Execute = Print | LButton, // 0x0000002B
Snapshot = Down | MButton, // 0x0000002C
PrintScreen = Snapshot, // 0x0000002C
Insert = PrintScreen | LButton, // 0x0000002D
Delete = PrintScreen | RButton, // 0x0000002E
Help = Delete | LButton, // 0x0000002F
D0 = Space | ShiftKey, // 0x00000030
D1 = D0 | LButton, // 0x00000031
D2 = D0 | RButton, // 0x00000032
D3 = D2 | LButton, // 0x00000033
D4 = D0 | MButton, // 0x00000034
D5 = D4 | LButton, // 0x00000035
D6 = D4 | RButton, // 0x00000036
D7 = D6 | LButton, // 0x00000037
D8 = D0 | Back, // 0x00000038
D9 = D8 | LButton, // 0x00000039
A = 65, // 0x00000041
B = 66, // 0x00000042
C = B | LButton, // 0x00000043
D = 68, // 0x00000044
E = D | LButton, // 0x00000045
F = D | RButton, // 0x00000046
G = F | LButton, // 0x00000047
H = 72, // 0x00000048
I = H | LButton, // 0x00000049
J = H | RButton, // 0x0000004A
K = J | LButton, // 0x0000004B
L = H | MButton, // 0x0000004C
M = L | LButton, // 0x0000004D
N = L | RButton, // 0x0000004E
O = N | LButton, // 0x0000004F
P = 80, // 0x00000050
Q = P | LButton, // 0x00000051
R = P | RButton, // 0x00000052
S = R | LButton, // 0x00000053
T = P | MButton, // 0x00000054
U = T | LButton, // 0x00000055
V = T | RButton, // 0x00000056
W = V | LButton, // 0x00000057
X = P | Back, // 0x00000058
Y = X | LButton, // 0x00000059
Z = X | RButton, // 0x0000005A
LWin = Z | LButton, // 0x0000005B
RWin = X | MButton, // 0x0000005C
Apps = RWin | LButton, // 0x0000005D
Sleep = Apps | RButton, // 0x0000005F
NumPad0 = 96, // 0x00000060
NumPad1 = NumPad0 | LButton, // 0x00000061
NumPad2 = NumPad0 | RButton, // 0x00000062
NumPad3 = NumPad2 | LButton, // 0x00000063
NumPad4 = NumPad0 | MButton, // 0x00000064
NumPad5 = NumPad4 | LButton, // 0x00000065
NumPad6 = NumPad4 | RButton, // 0x00000066
NumPad7 = NumPad6 | LButton, // 0x00000067
NumPad8 = NumPad0 | Back, // 0x00000068
NumPad9 = NumPad8 | LButton, // 0x00000069
Multiply = NumPad8 | RButton, // 0x0000006A
Add = Multiply | LButton, // 0x0000006B
Separator = NumPad8 | MButton, // 0x0000006C
Subtract = Separator | LButton, // 0x0000006D
Decimal = Separator | RButton, // 0x0000006E
Divide = Decimal | LButton, // 0x0000006F
F1 = NumPad0 | ShiftKey, // 0x00000070
F2 = F1 | LButton, // 0x00000071
F3 = F1 | RButton, // 0x00000072
F4 = F3 | LButton, // 0x00000073
F5 = F1 | MButton, // 0x00000074
F6 = F5 | LButton, // 0x00000075
F7 = F5 | RButton, // 0x00000076
F8 = F7 | LButton, // 0x00000077
F9 = F1 | Back, // 0x00000078
F10 = F9 | LButton, // 0x00000079
F11 = F9 | RButton, // 0x0000007A
F12 = F11 | LButton, // 0x0000007B
F13 = F9 | MButton, // 0x0000007C
F14 = F13 | LButton, // 0x0000007D
F15 = F13 | RButton, // 0x0000007E
F16 = F15 | LButton, // 0x0000007F
F17 = 128, // 0x00000080
F18 = F17 | LButton, // 0x00000081
F19 = F17 | RButton, // 0x00000082
F20 = F19 | LButton, // 0x00000083
F21 = F17 | MButton, // 0x00000084
F22 = F21 | LButton, // 0x00000085
F23 = F21 | RButton, // 0x00000086
F24 = F23 | LButton, // 0x00000087
NumLock = F17 | ShiftKey, // 0x00000090
Scroll = NumLock | LButton, // 0x00000091
LShiftKey = F17 | Space, // 0x000000A0
RShiftKey = LShiftKey | LButton, // 0x000000A1
LControlKey = LShiftKey | RButton, // 0x000000A2
RControlKey = LControlKey | LButton, // 0x000000A3
LMenu = LShiftKey | MButton, // 0x000000A4
RMenu = LMenu | LButton, // 0x000000A5
BrowserBack = LMenu | RButton, // 0x000000A6
BrowserForward = BrowserBack | LButton, // 0x000000A7
BrowserRefresh = LShiftKey | Back, // 0x000000A8
BrowserStop = BrowserRefresh | LButton, // 0x000000A9
BrowserSearch = BrowserRefresh | RButton, // 0x000000AA
BrowserFavorites = BrowserSearch | LButton, // 0x000000AB
BrowserHome = BrowserRefresh | MButton, // 0x000000AC
VolumeMute = BrowserHome | LButton, // 0x000000AD
VolumeDown = BrowserHome | RButton, // 0x000000AE
VolumeUp = VolumeDown | LButton, // 0x000000AF
MediaNextTrack = LShiftKey | ShiftKey, // 0x000000B0
MediaPreviousTrack = MediaNextTrack | LButton, // 0x000000B1
MediaStop = MediaNextTrack | RButton, // 0x000000B2
MediaPlayPause = MediaStop | LButton, // 0x000000B3
LaunchMail = MediaNextTrack | MButton, // 0x000000B4
SelectMedia = LaunchMail | LButton, // 0x000000B5
LaunchApplication1 = LaunchMail | RButton, // 0x000000B6
LaunchApplication2 = LaunchApplication1 | LButton, // 0x000000B7
OemSemicolon = MediaStop | Back, // 0x000000BA
Oem1 = OemSemicolon, // 0x000000BA
Oemplus = Oem1 | LButton, // 0x000000BB
Oemcomma = LaunchMail | Back, // 0x000000BC
OemMinus = Oemcomma | LButton, // 0x000000BD
OemPeriod = Oemcomma | RButton, // 0x000000BE
OemQuestion = OemPeriod | LButton, // 0x000000BF
Oem2 = OemQuestion, // 0x000000BF
Oemtilde = 192, // 0x000000C0
Oem3 = Oemtilde, // 0x000000C0
OemOpenBrackets = Oem3 | Escape, // 0x000000DB
Oem4 = OemOpenBrackets, // 0x000000DB
OemPipe = Oem3 | IMEConvert, // 0x000000DC
Oem5 = OemPipe, // 0x000000DC
OemCloseBrackets = Oem5 | LButton, // 0x000000DD
Oem6 = OemCloseBrackets, // 0x000000DD
OemQuotes = Oem5 | RButton, // 0x000000DE
Oem7 = OemQuotes, // 0x000000DE
Oem8 = Oem7 | LButton, // 0x000000DF
OemBackslash = Oem3 | PageDown, // 0x000000E2
Oem102 = OemBackslash, // 0x000000E2
ProcessKey = Oem3 | Left, // 0x000000E5
Packet = ProcessKey | RButton, // 0x000000E7
Attn = Oem102 | CapsLock, // 0x000000F6
Crsel = Attn | LButton, // 0x000000F7
Exsel = Oem3 | D8, // 0x000000F8
EraseEof = Exsel | LButton, // 0x000000F9
Play = Exsel | RButton, // 0x000000FA
Zoom = Play | LButton, // 0x000000FB
NoName = Exsel | MButton, // 0x000000FC
Pa1 = NoName | LButton, // 0x000000FD
OemClear = NoName | RButton, // 0x000000FE
Shift = 65536, // 0x00010000
Control = 131072, // 0x00020000
Alt = 262144, // 0x00040000
}
https://blog.csdn.net/u012391923/article/details/52920316
⑥ 求助 51單片機編程,按一下KEY1,LED常亮,按一下KEY2,LED滅
P1.0 接KEY1 到地 ,P1.1接KEY2到地,P0.0接LED到高電平洞叢核納掘。
我還附帶給你加了按鍵防抖,程序鄭空如下:
#include<reg51.h>
sbit key1=P1^0;
sbit key2=P1^1;
sbit led=P0^0;
void delay(m)
{
int i,j;
for(i=0;i<m;i++)
{
for(j=0;j<125;j++)
{
}
}
}
void main()
{
while(1)
{
P1=0xff;
if (key1==0)
{
delay(20);
if(key1==0)
{
while(!key1);
led=0;
}
}
if (key2==0)
{
delay(20);
if(key2==0)
{
while(!key2);
led=1;
}
}
}
}
⑦ 單片機編程中key=~key什麼意思
~是按升鋒培位吵唯取反
比如基局 key = 0x55; // 01010101
key = ~key; // key = 0xaa; // 10101010
⑧ appkey是什麼意思
應用程序編程介面鍵,英文:Application programming interface key(API密鑰)是用於認證用戶,開發余念者或調用程序提供給一個唯一的標識符的API。
但是,它們通常用於通過 API 而不是人類用戶對項目進行身份驗證。不同的平台可能以不同的方式實現和使用 API 密鑰。
API 密鑰用於項目,而身份驗證是為豎辯困用戶指定的。在許多情況下,Cloud Endpoints 將處理身份驗證程序和 API 密鑰。兩者之間的區別因素是:
1、身份驗證令牌用於識別用戶,即使用該特定網站或應用程序的人。
2、API 密鑰用於識別進行調用的項目。這可以是網站或正在調用應用程序編程介面的應用程序。
API 密鑰通常不被認為是安全的;客戶通常可以訪問它們,從而使某人很容易竊取 API 密鑰。密鑰一旦被盜,就沒有有效期,因此可以無限期使用灶州,除非項目所有者撤銷或重新生成密鑰。如果 API 密鑰旨在供客戶端訪問,則只有與其他安全機制(例如 HTTPS/SSL)一起使用時,才會認為它是安全的。
獲取 API 密鑰:
1、 登錄或注冊 RapidAPI 帳戶。
2、 通過從主頁搜索或單擊其中一個集合,導航到任何 API 文檔頁面。
3、 向下滾動到 API 控制台的「Header Parameters」部分。
4、 API 密鑰應該在「X-RapidAPI-Key」欄位中可見。