用qt的知道，qt有方便简单的信号槽机制，但需要专门的qt工具处理。
如果想直接使信号槽就可以使用sigslot库，或者sigc++库，或者boost中的signals，这里介绍sigslot和sigc++库。
sigslot.h：只有一个头文件，使用简单方便。
sigc++：包含文件多，但功能更强大。
sigslot库
官方地址
http://sigslot.sourceforge.net/
在vs2013中使用
- 包含头文件
#include "sigslot.h"- 1
- 1
- 改动：
//在sigslot.h的420,将：
typedef sender_set::const_iterator const_iterator;
//改为：
typedef typename sender_set::const_iterator const_iterator;- 1
- 2
- 3
- 4
- 1
- 2
- 3
- 4
基本使用：
- signal0~signal8：信号类：作为类成员
class mySg
{
sigc::signal0<> sg1; // 无参数 sigc::signal2<char*, double> sg2; // 2个参数 }- 1
- 2
- 3
- 4
- 5
- 1
- 2
- 3
- 4
- 5
- connection
槽函数：作为类成员，类需要继承has_slots<>，且槽函数的返回值必须是void类型
class mySlot: public : has_slots<>
{
public:
void on_func1(){} // 无参数，与信号对应 void on_func2(char*, double)(){} // 2个参数 }; mySg sig; mySlot slt; sig.sg1.conncent(&slt,&mySlot::on_func1); sig.sg2.conncent(&slt,&mySlot::on_func2);- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- disconnection
解除连接：可以使用disconnect()和disconnect_all()
sig.sg1.disconnect(&slt);
sig.sg1.disconnect_all();- 1
- 2
- 1
- 2
- emiting
发送信号：可以直接使用()运算符，也可以调用signal的emit函数
sig.sg1.emit();
sig.sg2("str",0.1);- 1
- 2
- 1
- 2
实例：
#include <stdio.h>
#include <conio.h>
#include <cstdlib>
#include <iostream>
using namespace std; #include "sigslot.h" using namespace sigslot; #define pause_wait() {std::cout << "\nPlease press any key to continue.\n";_getch();} // class enum ObjState{Normal = 0, Hidden = 1}; class ObjectBase : public has_slots<> { public: ObjectBase(){ px = 0; py = 0; state = Normal; } ObjectBase(const int &x, const int &y):px(x), py(y){ state = Normal; } ~ObjectBase(){}; void onMoveBy(const int &x, const int &y){px += x; py += y;} void onResize(const int &x, const int &y){px = x; py = y;} void onSetState(ObjState s){this->state = s;} void onPrintState() { if(state == Normal) std::cout << "Normal" << std::endl; else if(state == Hidden) std::cout << "Hidden" << std::endl; else std::cout << "Error: error state value" << std::endl; } const int& getX(){return px;} const int& getY(){return py;} const char* getState() { if(state == Normal) return "Normal"; else if(state == Hidden) return "Hidden"; else return nullptr; } private: ObjState state; int px; int py; }; class Control { public: signal2<const int&, const int&> moveBy; signal2<const int&, const int&> resize; signal1<ObjState> setState; signal0<> printState;; }; int main(int argc, char* argv[]) { ObjectBase obj(10,10); Control ctrl; #if(1) ctrl.moveBy.connect(&obj, &ObjectBase::onMoveBy); ctrl.resize.connect(&obj, &ObjectBase::onResize); ctrl.setState.connect(&obj, &ObjectBase::onSetState); ctrl.printState.connect(&obj, &ObjectBase::onPrintState); //ctrl.moveBy.disconnect(&obj); //ctrl.moveBy.disconnect_all(); // start pro loop PRO_Start: while(true) { system("cls"); cout << "Object Information" << endl; cout << "\t Position_x: " << obj.getX() << endl; cout << "\t Position_y: " << obj.getY() << endl; cout << "\t State: " << obj.getState() << endl; cout << "\n"; cout << "\t m: move object \n" "\t r: resize object \n" "\t s: set object state \n" "\t p: print object state \n" << endl; cout << "Input:"; char ch = getchar(); switch(ch) { case 'm': // move ctrl.moveBy(10,10); break; case 'M': ctrl.moveBy.emit(-20,-20); break; case 'R': case 'r': // resize ctrl.resize.emit(0, 0); break; case 'P': case 'p': // printState goto PRO_PrintState; break; case 's': // setState ctrl.setState(Normal); break; case 'S': ctrl.setState.emit(Hidden); break; case 'Q': case 'q': // exit goto PRO_Exit; break; default: break; } } PRO_PrintState: ctrl.printState.emit(); pause_wait(); goto PRO_Start; #endif pause_wait(); PRO_Exit: return 0; }- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81
- 82
- 83
- 84
- 85
- 86
- 87
- 88
- 89
- 90
- 91
- 92
- 93
- 94
- 95
- 96
- 97
- 98
- 99
- 100
- 101
- 102
- 103
- 104
- 105
- 106
- 107
- 108
- 109
- 110
- 111
- 112
- 113
- 114
- 115
- 116
- 117
- 118
- 119
- 120
- 121
- 122
- 123
- 124
- 125
- 126
- 127
- 128
- 129
- 130
- 131
- 132
- 133
- 134
- 135
- 136
- 137
- 138
- 139
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81
- 82
- 83
- 84
- 85
- 86
- 87
- 88
- 89
- 90
- 91
- 92
- 93
- 94
- 95
- 96
- 97
- 98
- 99
- 100
- 101
- 102
- 103
- 104
- 105
- 106
- 107
- 108
- 109
- 110
- 111
- 112
- 113
- 114
- 115
- 116
- 117
- 118
- 119
- 120
- 121
- 122
- 123
- 124
- 125
- 126
- 127
- 128
- 129
- 130
- 131
- 132
- 133
- 134
- 135
- 136
- 137
- 138
- 139
sigc++库
官方地址
http://libsigc.sourceforge.net/
编译
可以在http://download.csdn.net/detail/yehuohan/9600368下载已经编好的库文件，2.8.0版
注意1：在用高版本编译时，如2.8.0，可能会提示找不到msvc_recommended_pragmas.h，可以在vs的
属性 -> C/C -> 高级 -> 强制包含文件- 1
- 1
去掉msvc_recommended_pragmas.h，或者添加一个msvc_recommended_pragmas.h文件，在http://download.csdn.net/detail/yehuohan/9600369的源代码时已经放入了该文件。
注意2：在使用高版本(如2.9.7)编译时，若提示找不到slot.cc等文件，可以使用低版本中的放入相应位置即可。
在vs中使用
* 项目 -> VC++目录 -> 包含目录： 添加 sigc++所在的目录
* 添加下列代码：
#include <sigc++/sigc++.h>
#ifdef _DEBUG
#pragma comment(lib,"sigcd.lib")
#else #pragma comment(lib,"sigc.lib") #endif- 1
- 2
- 3
- 4
- 5
- 6
- 1
- 2
- 3
- 4
- 5
- 6
基本使用：
- signal
信号类：可以作为其它类成员，也可直接定义
//返回值: int，2个参数:char*, double，参数个数可以直接指定
sigc::signal<int, char*, double> sg1; sigc::signal2<int, char*, double> sg2; class mySg { sigc::signal2<int, char*, double> sg3; }- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- connection
连接槽函数，作为类成员时，要继承sigc::trackable；
ptr_fun, ptr_fun0~7 : 连接全局函数；
mem_fun, mem_fun0~7 : 连接类成员函数；
ptr_fun,mem_fun与signal之间只要参数类型对应就可连接， 并非一定要数字对应（如：ptr_fun3并非一定要与signal3对应连接）
sigc::connection ccSg1 = sg1.connect(sigc::ptr_fun(&func1));
class mySlot: public : sigc::trackable
{
public:
int func2(char*, double)(){} } obj; sigc::connection ccSg2 = sg2.connect(sigc::mem_fun2(obj,&mySlot::func)); class mySg: public : sigc::trackable { mySg(){auto ccIter_Sg3 = sg3.connect(sigc::mem_fun(*this,&mySg::on_func));} sigc::signal2<int, char*, double> sg3; int on_func(char*, double)(){} }- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- disconnection
如果不需要解连接，可以不用定义sigc::connection
ccSg1.disconnect();
ccSg2.disconnect();- 1
- 2
- 1
- 2
- emiting
// 发送信号：调用signal的emit函数
sg1.emit("str",0.1);
sg2.emit("str",0.1);- 1
- 2
- 1
- 2
实例：
#include <stdio.h>
#include <conio.h>
#include <cstdlib>
#include <iostream>
using namespace std; #include <sigc++/sigc++.h> #ifdef _DEBUG #pragma comment(lib,"sigc280d.lib") #else #pragma comment(lib,"sigc280.lib") #endif // _DEBUG #define pause_wait() {std::cout << "\nPlease press any key to continue.\n";_getch();} // class enum ObjState{Normal = 0, Hidden = 1}; class ObjectBase : public sigc::trackable { public: ObjectBase(){ px = 0; py = 0; state = Normal; setConnection(); } ObjectBase(const int &x, const int &y) :px(x), py(y){ state = Normal; setConnection(); } ~ObjectBase(){}; sigc::signal<void,const char*> putMsg; void onMoveBy(const int &x, const int &y){px += x; py += y;} void onResize(const int &x, const int &y){px = x; py = y;} void onSetState(ObjState s){this->state = s;} void onPrintState() { if(state == Normal) std::cout << "Normal" << std::endl; else if(state == Hidden) std::cout << "Hidden" << std::endl; else std::cout << "Error: error state value" << std::endl; } const int& getX(){return px;} const int& getY(){return py;} const char* getState() { if(state == Normal) return "Normal"; else if(state == Hidden) return "Hidden"; else return nullptr; } private: ObjState state; int px; int py; void printMsg(const char* str){std::cout << str << std::endl; } void setConnection() { putMsg.connect(sigc::mem_fun(*this, &ObjectBase::printMsg)); } }; class Control { public: Control(){} sigc::signal<void, const int&, const int&> moveBy; sigc::signal2<void, const int&, const int&> resize; // return void type, and 2 parameters sigc::signal<void, ObjState> setState; private: }; // print word steped by space int printSpaceStr(const char* str) { int cnt = 0; const char* p = str; char ch; std::cout << endl; do { ch = *p; cout << ch << ' '; cnt++; } while (*++p != '\0'); std::cout << endl; return cnt; } int main(int argc, char* argv[]) { ObjectBase obj(0, 0); Control ctrl; sigc::signal1<int, const char*> printSS; sigc::connection ccPrintSS = printSS.connect(sigc::ptr_fun1(&printSpaceStr)); //ccPrintSS.disconnect(); sigc::signal0<void> printState; printState.connect(sigc::mem_fun(obj, &ObjectBase::onPrintState)); ctrl.moveBy.connect(sigc::mem_fun(obj, &ObjectBase::onMoveBy)); ctrl.resize.connect(sigc::mem_fun(obj, &ObjectBase::onResize)); auto ccIter_SetState = ctrl.setState.connect(sigc::mem_fun(obj, &ObjectBase::onSetState)); //ccIter_SetState->disconnect(); // start pro loop PRO_Start: while(true) { system("cls"); obj.putMsg.emit("Object Information"); cout << "\t Position_x: " << obj.getX() << endl; cout << "\t Position_y: " << obj.getY() << endl; cout << "\t State: " << obj.getState() << endl; cout << "\n"; cout << "\t m: move object \n" "\t r: resize object \n" "\t s: set object state \n" "\t p: print object state \n" "\t a: print space word \n" << endl; cout << "Input:"; char ch = getchar(); switch(ch) { case 'm': // move ctrl.moveBy.emit(10,10); break; case 'M': ctrl.moveBy.emit(-20,-20); break; case 'R': case 'r': // resize ctrl.resize.emit(0, 0); break; case 'P': case 'p': // printState goto PRO_PrintState; break; case 's': // setState ctrl.setState.emit(Normal); break; case 'S': ctrl.setState.emit(Hidden); break; case 'A': case 'a': goto RPO_PrintSpaceStr; break; case 'Q': case 'q': // exit goto PRO_Exit; break; default: break; } } PRO_PrintState: printState.emit(); pause_wait(); goto PRO_Start; RPO_PrintSpaceStr: printSS.emit("Sigc_Demo"); pause_wait(); goto PRO_Start; PRO_Exit: return 0; }