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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: 1wU=WE(kKZ  
   }Olr  
  一、实现方法 qYDj*wqf  
hq]xmM?&  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: EK:Y2WZ  
4*YOFU}l  
#pragma data_seg("shareddata") '?z9,oW{  
HHOOK hHook =NULL; //钩子句柄 =]WW'~  
UINT nHookCount =0; //挂接的程序数目 e2q pJ4i  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ,uKs>T^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 - a   
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Ny]'RS-  
static int KeyCount =0; J.*[gt%O|  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3^j~~ "2,w  
#pragma data_seg() %GNUnr$  
'E@2I9Kj  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 /0Rt+`  
8x!+tw7  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: :h^O{"au^  
d'x<- l9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR uDpf2(>s  
cKey,UCHAR cMask) xI-=t ib  
{ Xs{:[vRW  
 BOOL bAdded=FALSE; kQqBHA  
 for(int index=0;index<MAX_KEY;index++){ MT;SRAmUr  
  if(hCallWnd[index]==0){ y21)~  
   hCallWnd[index]=hWnd; *(@L+D0N  
   HotKey[index]=cKey; Q x9>,e6+  
   HotKeyMask[index]=cMask; N8Rm})  
   bAdded=TRUE; |LXrGyk^  
   KeyCount++; oV%( 37W9=  
   break; Y\+(rC27  
  } :;" aUHU'  
 } '*o7_Ez-{  
 return bAdded; I rtF4ia.  
} /%N31   
//删除热键 EX+={U|ua$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |V5$'/Y  
{ [[";1l  
 BOOL bRemoved=FALSE; d,h~u{  
 for(int index=0;index<MAX_KEY;index++){ 2LhfXBWf  
  if(hCallWnd[index]==hWnd){ 5`1(}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Verbmeg&n  
    hCallWnd[index]=NULL; [u`17hyX  
    HotKey[index]=0; FYx `o\  
    HotKeyMask[index]=0; hLDch5J5~  
    bRemoved=TRUE; 7yq7a[Ra  
    KeyCount--; &=+cov(3  
    break; WH pUjyBP  
   } )OW(T^>_'I  
  } 4yJ*85e]  
 } v^0*{7N'  
 return bRemoved; NpPuh9e{  
} I,8f{T!O@"  
Bz+zEXBC  
@'AjEl:&-_  
  DLL中的钩子函数如下: =Ts5\1sc>  
ko-,l6E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4it^-M  
{ [aS<u`/g|  
 BOOL bProcessed=FALSE; K HO@"+  
 if(HC_ACTION==nCode) z?3t^UPW  
 { D\H;_k8  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Y?'Krw `  
   switch(wParam) x$L(!ZDh  
   {  -s6k't  
    case VK_MENU: >.=v*\P  
     MaskBits&=~ALTBIT; p[^a4E_v  
     break; UFSbu5 j  
    case VK_CONTROL: h<0&|s*a)  
     MaskBits&=~CTRLBIT; &# < M o  
     break; ABaK60.O[O  
    case VK_SHIFT: A||,|He~  
     MaskBits&=~SHIFTBIT; '#eY4d<i]n  
     break; QWQJSz5  
    default: //judge the key and send message V1-URC24vd  
     break; '>:c:Tewy  
   } V] 0T P#  
   for(int index=0;index<MAX_KEY;index++){ JYw_Z*L=m  
    if(hCallWnd[index]==NULL) E#zLm  
     continue; nRHxbE}::  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <y2HzBC  
    { Fm#`}K_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); YwizA}a#  
     bProcessed=TRUE; dTrz7ayH  
    } e2_p7   
   } MXa(Oi2Gg  
  } ss0`9:z  
  else if((lParam&0xc000ffff)==1){ //有键按下 \=&F\EV  
   switch(wParam) |>zYUT[V  
   { IQ\5!e  
    case VK_MENU: or qL0i  
     MaskBits|=ALTBIT; w.o>G2u  
     break; >[0t@Tu,D  
    case VK_CONTROL: 5HC5   
     MaskBits|=CTRLBIT; s1>d)2lX  
     break; [[7=rn}@<  
    case VK_SHIFT: -T=sY/O  
     MaskBits|=SHIFTBIT; ^61;0   
     break; Whl^~$+f  
    default: //judge the key and send message -{z<+(K!$  
     break; %7hf6Xo=  
   } ],-(YPiAD  
   for(int index=0;index<MAX_KEY;index++){ >&YUV.mLY  
    if(hCallWnd[index]==NULL) gp<XTLJ@>  
     continue; T f40lv+{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QAzwNXE+  
    { EC/=JlL`5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); uGpLh0  
     bProcessed=TRUE; :*eJ*(M  
    } ,ygDNF  
   } ];\XA;aOl}  
  } GB}!7W"  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 -V=,x3Zew  
   for(int index=0;index<MAX_KEY;index++){ 6yd?xeD  
    if(hCallWnd[index]==NULL) afd.v$63  
     continue; ;nKhmcQ4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) uLrZl0%HT~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); U+:Mu]97  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 t""d^a#Dp  
   } [@/s! i @  
  } lF~!F<^9  
 } rs,:pU  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7E;`1lh7  
} :"`1}Q  
C;oO=R3r  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: n7hjYNJ  
 jRhRw;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `: 9n ]xP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Gk!CU"`sP  
&_,.*tha  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 5EL&?\e  
3 ]w a8|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /@0  
{ <=@6UPsn2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) HjZf3VwI  
 { w$ jq2?l  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Wt!8.d} =  
  SaveBmp(); v-}B T+  
  return FALSE; 6o~g3{Ow  
 } g|5cO3m0'  
 …… //其它处理及默认处理 ~{q; - &  
} U[6 ~ad a  
yH]w(z5Z  
.B{:<;sa  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ##'uekSJ  
UDV6 ##$  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 )zu m.6pT  
+HoCG;C{  
  二、编程步骤 DiSU\?N2'  
 4q\gFFV4  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; nk2H^RM^  
nBzju?X)I  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 'S 6JpWG1  
#ib?6=sPC  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; oPrK{flm  
G<`6S5J>hr  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; _A6e|(.ll  
{r:5\  
  5、 添加代码,编译运行程序。 S&MF; E6  
T.q7~ba*  
三、程序代码 EgTj   
lD,;xuQ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL p`}G" DM  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) E<77Tj  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ YeB)]$'?u`  
#if _MSC_VER > 1000 ZP&iy$<L  
#pragma once '?fGI3b~/  
#endif // _MSC_VER > 1000 'WBhW5@  
#ifndef __AFXWIN_H__ RzFxO  
#error include 'stdafx.h' before including this file for PCH +^J;ic  
#endif ,OP\^  
#include "resource.h" // main symbols 5~(nHCf>  
class CHookApp : public CWinApp $(08!U  
{ F[0~{*/|G  
 public: /^I!)|At  
  CHookApp(); bxBndxl  
  // Overrides HqV4!o9'  
  // ClassWizard generated virtual function overrides H`Zg-j`  
  //{{AFX_VIRTUAL(CHookApp) xon^=Wo;  
 public: No+BS%F5  
  virtual BOOL InitInstance(); qzLD  
  virtual int ExitInstance(); *A")A.R  
  //}}AFX_VIRTUAL De>,i%`Q,D  
  //{{AFX_MSG(CHookApp) r?^L/HGc  
  // NOTE - the ClassWizard will add and remove member functions here. ymnK`/J!Q  
  // DO NOT EDIT what you see in these blocks of generated code ! 9y} J|z  
  //}}AFX_MSG *KU:D Y{  
  DECLARE_MESSAGE_MAP() osLEH?iKW  
}; CDr0QM4k:.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); eu$"GbqY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Nd@/U c  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {!wd5C@  
BOOL InitHotkey(); 1:./f|m  
BOOL UnInit(); -*-"kzgd  
#endif u09D`QPP]  
62G %.'7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Q7UQwAN'  
#include "stdafx.h" Gf9O\wrs  
#include "hook.h" -$@'@U  
#include <windowsx.h> ou]jm=4[  
#ifdef _DEBUG &Wk:>9]Jrb  
#define new DEBUG_NEW ORXH<;^0y  
#undef THIS_FILE pE0@m-p  
static char THIS_FILE[] = __FILE__; }/IP\1bG  
#endif ~*~aFf5  
#define MAX_KEY 100 sqRvnCD!  
#define CTRLBIT 0x04 ^?A>)?Sq  
#define ALTBIT 0x02 hQvI}  
#define SHIFTBIT 0x01 ltkA7dUbu  
#pragma data_seg("shareddata") .R@XstQ  
HHOOK hHook =NULL; i~5'bSq c  
UINT nHookCount =0; GW7+#  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  qzSm]l?z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT hVJ}EF 0  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (&_^1  
static int KeyCount =0; B&EUvY '  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift UjyrmQf  
#pragma data_seg() @B?'Mu*  
HINSTANCE hins; fN9uSnu  
void VerifyWindow(); Fa{[kJ8z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 0a,B&o1  
//{{AFX_MSG_MAP(CHookApp) yD0DPtti  
// NOTE - the ClassWizard will add and remove mapping macros here. y`7b3*P  
// DO NOT EDIT what you see in these blocks of generated code! x4(8 =&Z  
//}}AFX_MSG_MAP B3pjli  
END_MESSAGE_MAP() CI-1>= "OE  
%'X~9Pvi  
CHookApp::CHookApp() ~FQHT?DAo  
{ mkhWbzD'S  
 // TODO: add construction code here, q!W=U8`  
 // Place all significant initialization in InitInstance -2(?O`tZ  
} '1(6@5tyWk  
JPHM+3v  
CHookApp theApp; L|L|liWd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) z~==7:Os  
{ SUv'cld  
 BOOL bProcessed=FALSE; C"$~w3A k  
 if(HC_ACTION==nCode) BzS\p3&  
 { $ 7W5smW/  
  if((lParam&0xc0000000)==0xc0000000){// Key up uE<8L(*B  
   switch(wParam) cGR)$:  
   { "LJV}L  
    case VK_MENU: {bR2S&=OmK  
     MaskBits&=~ALTBIT; KVr9kcs  
     break; ^*.+4iHx  
    case VK_CONTROL: ~#i2reG5  
     MaskBits&=~CTRLBIT; :U *8S\$  
     break; \I-e{'h  
    case VK_SHIFT: a+\<2NXYD  
     MaskBits&=~SHIFTBIT; R\XS5HOE(  
     break; mRm}7p  
    default: //judge the key and send message e&*b{>1*  
     break; 7qZC+x6_L  
   } ^< ;C IXo  
   for(int index=0;index<MAX_KEY;index++){ xm1'  
    if(hCallWnd[index]==NULL) $(+xhn(O  
     continue; #oFyi @U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 93:oXyFjD  
    { D[?;+g/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); lM}-'8tt?  
     bProcessed=TRUE; v|\#wrCT?  
    } )Tp"l"(G  
   } l qwy5#  
  } bJ 2>@|3*  
  else if((lParam&0xc000ffff)==1){ //Key down %p$XK(6  
   switch(wParam) sW'_K.z  
   { >j3':>\U  
    case VK_MENU: 9<&M~(dwT4  
     MaskBits|=ALTBIT; K;WQV,  
     break; iETUBZ  
    case VK_CONTROL: cm_5,wB(w  
     MaskBits|=CTRLBIT; 4L ]4WVc  
     break; F[SZwMf29  
    case VK_SHIFT: c*.  
     MaskBits|=SHIFTBIT; Y]KHCY  
     break; > Xh=P%  
    default: //judge the key and send message `2LmLFkb  
     break; '*65j  
   } s~2o<#  
   for(int index=0;index<MAX_KEY;index++) /RMtCa~  
   { .r{t&HO;Y  
    if(hCallWnd[index]==NULL) &fW;;>  
     continue; `P'{HT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nwz}&nR  
    { 'c#ZW| A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); F*WW v&\X  
     bProcessed=TRUE; l\8 l.xP  
    } ye U4,K o  
   } !Xt=+aKN  
  } +nKxSjqI  
  if(!bProcessed){ NJ-cP m  
   for(int index=0;index<MAX_KEY;index++){ fT.5@RR7^  
    if(hCallWnd[index]==NULL) =dbLA ,z9  
     continue; rn1FCJ<;H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -0| '{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m{gK<T  
   } 'Mjbvh4  
  } :SSlUl4sU$  
 } :xd&V%u`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); >gDsjHQ6;  
} x@ bZ((w  
zk]6|i$!I  
BOOL InitHotkey() ~..h=  
{ Z2 B59,I  
 if(hHook!=NULL){ .a:Oj3=0  
  nHookCount++; <wTkPErUG  
  return TRUE; ,)+O.Lf7&.  
 } 7<{Zq8)  
 else & Qghm o  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); hD\C[C,  
  if(hHook!=NULL) nM8aC&Rd\  
   nHookCount++; GpF,=:  
  return (hHook!=NULL); NW=j>7  
} ;D]TPBE  
BOOL UnInit() B dm<<<  
{  ]\P  
 if(nHookCount>1){ `A80""y:M  
  nHookCount--; K@*m6)  
  return TRUE; _*Vq1D]C  
 } -tx)7KV-  
 BOOL unhooked = UnhookWindowsHookEx(hHook); fE)+9!  
 if(unhooked==TRUE){ UR-e'Z&]  
  nHookCount=0; #.}Su+XF  
  hHook=NULL; I}Q3B3Byg  
 } c#9 zw[y-L  
 return unhooked; KnZm(c9+  
} !0`ZK-nA6  
ak7kb75o  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2]1u0-M5L  
{ #l ZK_N|1x  
 BOOL bAdded=FALSE; V(_1q  
 for(int index=0;index<MAX_KEY;index++){ >!6|yk`GJ  
  if(hCallWnd[index]==0){ [% C,&h5  
   hCallWnd[index]=hWnd; < Hkq  
   HotKey[index]=cKey; Nai5!_'  
   HotKeyMask[index]=cMask; tLBtE!J$[  
   bAdded=TRUE; HcgvlFb  
   KeyCount++; XEgJ7h_  
   break; MfP)Pk5  
  } z@yTkH_  
 } `PC9t)%.pV  
 return bAdded; *!%lBt{2  
} |@vkQ  
_p^ "l2%D/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Zge(UhZ  
{ H/c (m|KK  
 BOOL bRemoved=FALSE; X_]rtG  
 for(int index=0;index<MAX_KEY;index++){ yd).}@  
  if(hCallWnd[index]==hWnd){ nN\H'{Wzd  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ D7;9D*o\  
    hCallWnd[index]=NULL; <7M-?g:vj  
    HotKey[index]=0; <eoie6@3  
    HotKeyMask[index]=0; a YWWln  
    bRemoved=TRUE; [ QiG0D_'=  
    KeyCount--; z3Q&O$5\  
    break; )h8}{*  
   } }d<R 5  
  } )S caT1I  
 } ]mTBD<3\  
 return bRemoved; 0f^{Rp6  
} fSkDD>&  
=V[uXm  
void VerifyWindow() [={mCGU  
{ rO'DT{Yt  
 for(int i=0;i<MAX_KEY;i++){ !sb r!Qt  
  if(hCallWnd!=NULL){ \84t\jKR  
   if(!IsWindow(hCallWnd)){ <kak9 6A  
    hCallWnd=NULL; kAki 9a(=!  
    HotKey=0; 1~5DIU^  
    HotKeyMask=0; n0xGIq  
    KeyCount--; qCV<-o  
   } ,`@pi@<"#  
  } 'X^auyL  
 } 04X/(74  
} SrdCLT8  
9-=kVmT&g  
BOOL CHookApp::InitInstance() C91'dM  
{ +q432ZG  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); rUB67ok*  
 hins=AfxGetInstanceHandle(); >I/~)B`jhE  
 InitHotkey(); #zn`)n  
 return CWinApp::InitInstance(); Y$hLsM\%  
} <HW2W"Go\  
=p8iYtI  
int CHookApp::ExitInstance() cn_KHz=  
{ YMwL(m1  
 VerifyWindow(); #@M'*X_%}K  
 UnInit(); Es:oXA  
 return CWinApp::ExitInstance(); |JUAR{  
} G>2: WQ/  
SzjylUYV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,f~8:LHq  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) cbx( L8  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ fdKTj =4  
#if _MSC_VER > 1000 eGrxS;NY  
#pragma once p!LaR.8]  
#endif // _MSC_VER > 1000 bXWodOSN  
7TGLt z  
class CCaptureDlg : public CDialog ]bb`6 \h  
{ -D30(g{O  
 // Construction !T8h+3 I  
 public: D4CiB"g3*  
  BOOL bTray; "': u#UdS  
  BOOL bRegistered; 9"mcN3x:\e  
  BOOL RegisterHotkey(); "G @(AE(  
  UCHAR cKey; Lr`G. e  
  UCHAR cMask; \HZ]=B#0  
  void DeleteIcon(); h; 8^vB y  
  void AddIcon(); JRl`evTS  
  UINT nCount; 75t5:>"[  
  void SaveBmp(); ZAcW@xfb  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor X` FFI6pb  
  // Dialog Data ")ZsY9-P  
  //{{AFX_DATA(CCaptureDlg) 00)=3@D  
  enum { IDD = IDD_CAPTURE_DIALOG }; F`\7&'I  
  CComboBox m_Key; aI0}E O  
  BOOL m_bControl; D%k]D/  
  BOOL m_bAlt; w st)O{4  
  BOOL m_bShift; 9&uWj'%ia  
  CString m_Path; 6S2v3  
  CString m_Number; .TTXg,8#D  
  //}}AFX_DATA AmmUoS\  
  // ClassWizard generated virtual function overrides 27!9LU  
  //{{AFX_VIRTUAL(CCaptureDlg) O*7Gl G  
 public: L=wg"$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ? 3 l4U  
 protected: 5+[`x ']l  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support GGR hM1II  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); tu6Q7CjW8  
  //}}AFX_VIRTUAL 'YcoF;&[C  
  // Implementation +u:Q+PkM  
 protected: {|~22UkF[V  
  HICON m_hIcon; <U ?_-0  
  // Generated message map functions i; 3^vhbQ  
  //{{AFX_MSG(CCaptureDlg) g :me:M  
  virtual BOOL OnInitDialog(); -gpF%g`H  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?u9JRXj%  
  afx_msg void OnPaint(); naT;K0T=  
  afx_msg HCURSOR OnQueryDragIcon(); W6m oFn  
  virtual void OnCancel(); Ux Yb[Nbc  
  afx_msg void OnAbout(); u~9gR@e2{  
  afx_msg void OnBrowse(); ag$mc8-p[  
  afx_msg void OnChange(); 7EKQE>xj  
 //}}AFX_MSG ~#b&UR  
 DECLARE_MESSAGE_MAP() P'4jz&4  
}; )NwIEk>Tf  
#endif J\@yP  
'}D$"2I*  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~fE6g3  
#include "stdafx.h" j'V# =vH  
#include "Capture.h" V.RG= TVS  
#include "CaptureDlg.h" C>vp oCA  
#include <windowsx.h> + W ? / A]  
#pragma comment(lib,"hook.lib") JZ5N Q)sX  
#ifdef _DEBUG _[,oP s:+  
#define new DEBUG_NEW 8yH*  
#undef THIS_FILE 'ju{j`b  
static char THIS_FILE[] = __FILE__; S;vE %  
#endif :Qg3B ';  
#define IDM_SHELL WM_USER+1 5 ap~;t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /(?s\}O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nFWiS~(#sW  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; IyM:9=}5  
class CAboutDlg : public CDialog 2XEE/]^  
{ qj4jM7  
 public: Ug384RzHN  
  CAboutDlg(); `2]TPaWGh  
  // Dialog Data R7KV @n  
  //{{AFX_DATA(CAboutDlg) ]]e>Jym  
  enum { IDD = IDD_ABOUTBOX }; skU }BUK6  
  //}}AFX_DATA 4dm0:, G  
  // ClassWizard generated virtual function overrides [KCR@__  
  //{{AFX_VIRTUAL(CAboutDlg) ^Pah\p4bj  
 protected: m/;fY>}3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V(g5Gn?  
  //}}AFX_VIRTUAL 3E0C$v KM  
  // Implementation nB 0KDt_  
 protected: l%p,m [  
  //{{AFX_MSG(CAboutDlg) H7k@Br  
  //}}AFX_MSG RS#C4NG  
  DECLARE_MESSAGE_MAP() > 6=3y4tP  
}; 0{XT#H  
6!N2B[9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) sXNb  
{ =LgMG^@mu  
 //{{AFX_DATA_INIT(CAboutDlg) mD|Q+~=|e  
 //}}AFX_DATA_INIT OJhMM-  
}  ;]bW  
BR_fOIDc  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <_]W1V:0  
{ $My~sN8  
 CDialog::DoDataExchange(pDX); n&DBMU  
 //{{AFX_DATA_MAP(CAboutDlg) 6L)7Q0Z  
 //}}AFX_DATA_MAP E}THG=6  
} YK5(oKFN  
jc\y{I\  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g++-v HD  
 //{{AFX_MSG_MAP(CAboutDlg) {wgq>cb  
 // No message handlers VvT7v]  
 //}}AFX_MSG_MAP IYHNN  
END_MESSAGE_MAP() Z[B:6\oQ  
>_G'o  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) a*:GCGe  
: CDialog(CCaptureDlg::IDD, pParent) e,Y<$kPV  
{ ?RW1%+[  
 //{{AFX_DATA_INIT(CCaptureDlg) C\vOxBAB  
  m_bControl = FALSE; u^#e7u  
  m_bAlt = FALSE; T LF'7ufq  
  m_bShift = FALSE; B(5>H2  
  m_Path = _T("c:\\"); z-:>[Sn  
  m_Number = _T("0 picture captured."); 2@@evQ  
  nCount=0; FjLMN{eH/  
  bRegistered=FALSE; BjA$^i|8  
  bTray=FALSE; wh2E$b(-  
 //}}AFX_DATA_INIT |`s:&<W+kp  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4tx6h<L#s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); z.?slYe[  
} 2 )3oX  
1kR. .p<"  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) '?g&);4)k-  
{ uh\Tf5  
 CDialog::DoDataExchange(pDX); iyXd"O  
 //{{AFX_DATA_MAP(CCaptureDlg) ^7Z;=]8J  
  DDX_Control(pDX, IDC_KEY, m_Key); w0vsdM;G  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); o[i*i<jv-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); L 4Z+8*  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 5UG9&:zu'V  
  DDX_Text(pDX, IDC_PATH, m_Path); ,KU%"{6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 'GiN^Y9dcc  
 //}}AFX_DATA_MAP jzBW'8  
} t1yOAbI  
KWAd~8,mk  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lnm@DWhf  
//{{AFX_MSG_MAP(CCaptureDlg) }^j8<  
 ON_WM_SYSCOMMAND() 99CK [G  
 ON_WM_PAINT() 'cQ,;y  
 ON_WM_QUERYDRAGICON() ?mSZQF:d@  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) foL4s;2  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }pnp._j  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _VTpfeL@n  
//}}AFX_MSG_MAP } #L_R  
END_MESSAGE_MAP() 5X>~39(r  
kqxq'Aq)d  
BOOL CCaptureDlg::OnInitDialog() B& R?{y*  
{ UUb0[oy  
 CDialog::OnInitDialog(); CDsl)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); I,HtW),  
 ASSERT(IDM_ABOUTBOX < 0xF000); !$>b}w'  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @!O(%0 =  
 if (pSysMenu != NULL) X(rXRP#  
 { * fj`+J  
  CString strAboutMenu; ~TeOl|!lE+  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 5MD'AP:  
  if (!strAboutMenu.IsEmpty()) -.ZP<,?@F  
  { b18f=<#  
   pSysMenu->AppendMenu(MF_SEPARATOR); /!A"[Tyt  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); r<Cr)%z!  
  } 4cM0f,nc+  
 } a?8)47)  
 SetIcon(m_hIcon, TRUE); // Set big icon l^B4.1rT  
 SetIcon(m_hIcon, FALSE); // Set small icon z,7;+6*=L  
 m_Key.SetCurSel(0); 0Q?%B6g$m[  
 RegisterHotkey(); ZH8w^}  
 CMenu* pMenu=GetSystemMenu(FALSE); zUZET'Bm9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); b4bd^nrqV  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); b6sf1E  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _~ei1 G.R  
 return TRUE; // return TRUE unless you set the focus to a control W*#5Sk  
} ~gGkw#  
q(^iT~}  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) o$Nhx_F  
{ 9p3~WA/M@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) VwZ~ntk  
 { K[0z$T\  
  CAboutDlg dlgAbout; U;t1 K  
  dlgAbout.DoModal(); -lm)xpp1  
 } rG3?Z^&R+  
 else vL8Rg} Jh4  
 { 3? F~ H  
  CDialog::OnSysCommand(nID, lParam); DcN!u6sJ  
 } c/E'GG%Q%  
} k5)a|  
yX/{eX5dr  
void CCaptureDlg::OnPaint() 3!vnSX(iv  
{ *auT_*  
 if (IsIconic()) fGoJP[ae  
 { 0[E \h   
  CPaintDC dc(this); // device context for painting Q hdG(`PY~  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {@hJPK8  
  // Center icon in client rectangle m"!Q5[  
  int cxIcon = GetSystemMetrics(SM_CXICON); h.q9p!  
  int cyIcon = GetSystemMetrics(SM_CYICON); aNP\Q23D  
  CRect rect; l2ie\4dK@  
  GetClientRect(&rect); /}9)ZY Mx  
  int x = (rect.Width() - cxIcon + 1) / 2; D>0(*O  
  int y = (rect.Height() - cyIcon + 1) / 2; tXcZl!3x  
  // Draw the icon AkCy C1  
  dc.DrawIcon(x, y, m_hIcon); AG><5 }  
 } 6sG5 n7E-A  
 else 5+yy:#J]  
 { pog   
  CDialog::OnPaint(); WtO@Kf:3GH  
 } ~O|~M_Z  
} #x`K4f)  
kU,g=+ 2J  
HCURSOR CCaptureDlg::OnQueryDragIcon() vo(:g6$  
{ _}F _Q5)  
 return (HCURSOR) m_hIcon; f3S 8~!  
} bo1J'pU  
-[}Aka,f!  
void CCaptureDlg::OnCancel() ESUO I  
{ 31UxYBY  
 if(bTray) yzZzaYv "/  
  DeleteIcon(); hV:++g  
  CDialog::OnCancel(); AN3oh1xe:  
} R+z'6&/ =I  
O p1TsRm5L  
void CCaptureDlg::OnAbout() m#[9F']Z`  
{ P^!g0K  
 CAboutDlg dlg; ~!=Am:-wr  
 dlg.DoModal(); ~f"3Wa*\B  
} r+h%a~A#>  
N;,zPWa  
void CCaptureDlg::OnBrowse() EIfqRRTA  
{ N"1o> !  
 CString str; PTrKnuM\J_  
 BROWSEINFO bi; ZxLdh8v.  
 char name[MAX_PATH]; Z:9xf:g *  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); >zFk}/  
 bi.hwndOwner=GetSafeHwnd(); u0 myB/`  
 bi.pszDisplayName=name; .\XFhOsa  
 bi.lpszTitle="Select folder"; m/@ ;N,K  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; jYDpJ##Zb  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); $p:RnH\H1  
 if(idl==NULL) "159Q  
  return; L/\s~*:M  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 4eH:eCZze  
 str.ReleaseBuffer(); .8Eh[yiln  
 m_Path=str; vZMb/}-o  
 if(str.GetAt(str.GetLength()-1)!='\\') pGz 5!d  
  m_Path+="\\"; {Tx"G9  
 UpdateData(FALSE); prtNfwJz1j  
} #&0G$~  
NULew]:5  
void CCaptureDlg::SaveBmp() 1eHU!{<fqm  
{ kjAARW  
 CDC dc; uCkXzb9_z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); s0r::yO  
 CBitmap bm; DO*rVs3'p[  
 int Width=GetSystemMetrics(SM_CXSCREEN); %Q,6sH#  
 int Height=GetSystemMetrics(SM_CYSCREEN); `CpfQP&^  
 bm.CreateCompatibleBitmap(&dc,Width,Height); atr 0hmQ  
 CDC tdc; 7v'aw"~  
 tdc.CreateCompatibleDC(&dc); #aI(fQZe  
 CBitmap*pOld=tdc.SelectObject(&bm); 7R5m|h`M  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X~UrAG}_  
 tdc.SelectObject(pOld); ~mBY_[_s=  
 BITMAP btm; X$r5KJU  
 bm.GetBitmap(&btm); ~jz!jF~I  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; R+sv?4k  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,9,cN-/a  
 BITMAPINFOHEADER bih; z }3` 9  
 bih.biBitCount=btm.bmBitsPixel; <JUumrEo  
 bih.biClrImportant=0; ;Mw<{X-  
 bih.biClrUsed=0; %CoO-1@C  
 bih.biCompression=0; ._%8H  
 bih.biHeight=btm.bmHeight; +{~ cX] |  
 bih.biPlanes=1; "+XF'ZO  
 bih.biSize=sizeof(BITMAPINFOHEADER); w{8O$4 w  
 bih.biSizeImage=size; y^0 mf|  
 bih.biWidth=btm.bmWidth; ^O0trM>h-  
 bih.biXPelsPerMeter=0; ?,}:)oA_  
 bih.biYPelsPerMeter=0; [n]C  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8u%rh[g'  
 static int filecount=0; P*|qbY  
 CString name; t $m:  
 name.Format("pict%04d.bmp",filecount++); q}P UwN6  
 name=m_Path+name; w`GjQIA  
 BITMAPFILEHEADER bfh; *epK17i=  
 bfh.bfReserved1=bfh.bfReserved2=0; Tuz~T _M  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Y sDai<  
 bfh.bfSize=54+size; %9!, PeRe  
 bfh.bfOffBits=54; L:ox$RU  
 CFile bf; R>iRnrn:-  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ |KHaL?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -<[MM2Y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));  M[^  
  bf.WriteHuge(lpData,size); ,u1Yn}  
  bf.Close(); ;p !|E3o.  
  nCount++; J .r^"K\  
 } gxIGL-1M  
 GlobalFreePtr(lpData); b V5{  
 if(nCount==1) LK}Ih@ f  
  m_Number.Format("%d picture captured.",nCount); XvU^DEfW  
 else Stkyz:,(  
  m_Number.Format("%d pictures captured.",nCount); K\7\  
  UpdateData(FALSE); .K=r.tf~  
} L"|~,SVF  
&p)]Cl/`  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =r3%jWH6  
{ a5/6DK>  
 if(pMsg -> message == WM_KEYDOWN) OO Hw-MW  
 { mIK-a{?G  
  if(pMsg -> wParam == VK_ESCAPE) F%t_9S,)O  
   return TRUE; Df\~ ZWs!  
  if(pMsg -> wParam == VK_RETURN) J|9kWjOf+i  
   return TRUE; }9k/Y/.  
 } M7O5uW`  
 return CDialog::PreTranslateMessage(pMsg); eF[CiO8F2  
} yMU>vr  
rqp]{?33  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 21Dc.t{  
{ w-R.)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _OjZ>j<B.  
  SaveBmp(); nhMxw @Z\  
  return FALSE; co\Il]`R/  
} ' =5B   
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !&b| [b  
 CMenu pop; 8!.V`|@lt  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); djnES,^%9  
 CMenu*pMenu=pop.GetSubMenu(0); #C.  
 pMenu->SetDefaultItem(ID_EXITICON); .hG*mXw>  
 CPoint pt; sG_/E-%5'  
 GetCursorPos(&pt); XC;Icr)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {Ak 4GL  
 if(id==ID_EXITICON) 'oY#a9~Z{  
  DeleteIcon(); KiI+ V;o  
 else if(id==ID_EXIT) ORF:~5[YS`  
  OnCancel(); @.i#uMWF`  
 return FALSE; vR!g1gI23  
} 45wtl/^9  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); L~;(M6Jp  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) h/|p`MP\1  
 AddIcon(); Z|x|8 !D  
 return res; z7AWWr=H  
} eZU9L/w:  
>O24#!9XW  
void CCaptureDlg::AddIcon() /; Bmh=  
{ D@68_sn  
 NOTIFYICONDATA data; h ':ZF  
 data.cbSize=sizeof(NOTIFYICONDATA); |]@Pq[Hn|  
 CString tip; 4L8hn4F  
 tip.LoadString(IDS_ICONTIP); r)}U 'iv*%  
 data.hIcon=GetIcon(0); HBOyiIm Q  
 data.hWnd=GetSafeHwnd(); xIa7F$R 0  
 strcpy(data.szTip,tip); kO3\v)B;  
 data.uCallbackMessage=IDM_SHELL; lcm [l  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; PgK7CG7G  
 data.uID=98; W +ER'lX  
 Shell_NotifyIcon(NIM_ADD,&data); ; iia?f1  
 ShowWindow(SW_HIDE); }}tbOD)t  
 bTray=TRUE; 7LVG0A2>7  
} xH*X5?  
lh"*$.j-  
void CCaptureDlg::DeleteIcon() \_8wU' 7  
{ I6f/+;E  
 NOTIFYICONDATA data; 2NMs-Zs  
 data.cbSize=sizeof(NOTIFYICONDATA); iI IXv  
 data.hWnd=GetSafeHwnd(); 6ABK)m-y  
 data.uID=98; _#:/ ~Jp  
 Shell_NotifyIcon(NIM_DELETE,&data); MHK|\Z&e7  
 ShowWindow(SW_SHOW); XhM!pSl\  
 SetForegroundWindow(); ,?|$DY+=  
 ShowWindow(SW_SHOWNORMAL); -<6?ISF2  
 bTray=FALSE; <R /\nYXz  
} ;cI*"-I:F  
[ncK+rGAc  
void CCaptureDlg::OnChange() , [|aWT%9  
{ be,Rj,-  
 RegisterHotkey(); O[C4xq  
} >SK:b/i  
9dhEQ=K{3  
BOOL CCaptureDlg::RegisterHotkey() Q# B0JT1  
{ rKrHd  
 UpdateData(); e(? w h   
 UCHAR mask=0; 8#7qHT;cx  
 UCHAR key=0; ",$_\l  
 if(m_bControl) :D)(3U5  
  mask|=4; V]p{jLG  
 if(m_bAlt) fgdR:@]-  
  mask|=2; aaR& -M@  
 if(m_bShift)  -BSdrP|  
  mask|=1; =n5'~1?X?  
  key=Key_Table[m_Key.GetCurSel()]; pUXoSnIq:  
 if(bRegistered){ Cd}^&z  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); RXWdqaENx  
  bRegistered=FALSE; E9.1~ )  
 } 0|\JbM  
 cMask=mask; a[=B?Bd  
 cKey=key; >FFp"%%  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |c$*Fa"A  
 return bRegistered; z`J-J*R>d  
} )C$Ij9<A  
&` "uKO]  
  四、小结 Y}\3PaUa  
> JTf0/  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
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