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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: &mM0AA'\?H  
  E' uZA  
  一、实现方法 sV*H`N')S  
$<[79al#  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: <IW$m!{VG  
[()koU#w.  
#pragma data_seg("shareddata") uCB=u[]y4  
HHOOK hHook =NULL; //钩子句柄 ql~J8G9  
UINT nHookCount =0; //挂接的程序数目 b%c9oR's^  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 f* wx<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 dlnX_+((KC  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey u)Whr@m  
static int KeyCount =0; Y}KNKO;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &BSn?  
#pragma data_seg() ;mi%F3  
w&.a QGR#  
  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。 +aAc9'k   
+ >!;i6|  
  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: :Llb< MY2  
cm+P]8o%{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |k9 C/  
cKey,UCHAR cMask) #[[ en  
{ b#o|6HkW  
 BOOL bAdded=FALSE; /g.U&oI]D  
 for(int index=0;index<MAX_KEY;index++){ \GU<43J2uo  
  if(hCallWnd[index]==0){ iN.n8MN=I  
   hCallWnd[index]=hWnd; 8RHUeRX  
   HotKey[index]=cKey; )O6>*wq  
   HotKeyMask[index]=cMask; 1B\WA8  
   bAdded=TRUE; u$`a7Lp,n  
   KeyCount++; =i3n42M#  
   break; c+GG\:gM  
  } ,/U6[P_C5  
 } @E8+C8'  
 return bAdded; wKY_Bo/d  
} 4 H&#q>  
//删除热键 O33 `+UV"W  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2+WaA ,   
{ BL4-7  
 BOOL bRemoved=FALSE; 7x8  yxE  
 for(int index=0;index<MAX_KEY;index++){ 7PF%76TO  
  if(hCallWnd[index]==hWnd){ UL9n-M =  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J,6yYIq  
    hCallWnd[index]=NULL; q0 \6F^;M  
    HotKey[index]=0; 'O-"\J\  
    HotKeyMask[index]=0; EBmt9S  
    bRemoved=TRUE; yF/jFn  
    KeyCount--; 4`=m u}Y2  
    break; @[v~y"tE}  
   } U`s{Jm  
  } W!(LF7_!  
 } XB5DPx  
 return bRemoved; ( uidNq  
} 8a"%0d#  
Vf1^4 t  
[a<SDMR  
  DLL中的钩子函数如下: ?Ss!e$jf  
K~ EmD9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) pmYHUj #  
{ 7cMv/g^ h@  
 BOOL bProcessed=FALSE; Uoix  
 if(HC_ACTION==nCode) 3irl (;v  
 { Ssg&QI  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 p{dj~ &v  
   switch(wParam) Qe(:|q _  
   {  XRQ4\bMA8  
    case VK_MENU: _u9Jxw?F@Y  
     MaskBits&=~ALTBIT; kg\ >k2h  
     break; E&:,oG2M  
    case VK_CONTROL: ZSm3XXk  
     MaskBits&=~CTRLBIT; {BU;$  
     break; ~flV`wy$$1  
    case VK_SHIFT: bi;1s'Y<D  
     MaskBits&=~SHIFTBIT; Yu2Bkq+  
     break; T^]}Oy@e,J  
    default: //judge the key and send message Eu04e N  
     break; IV)j1  
   } '@P^0+B!(.  
   for(int index=0;index<MAX_KEY;index++){ K!l5coM  
    if(hCallWnd[index]==NULL) .(2ik5A%9  
     continue; ,~W|]/b<q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uWE^hz"  
    { mpJ#:}n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u\nh[1)a)  
     bProcessed=TRUE; Aq7osU1B  
    } "g8M0[7e3  
   } uY'HT|@:{  
  } NQ2E  
  else if((lParam&0xc000ffff)==1){ //有键按下 7Hu3>4<  
   switch(wParam) 4H]L~^CD  
   { 5l*&>C[(i  
    case VK_MENU: `*KHS A  
     MaskBits|=ALTBIT; jo@J}`\Zt  
     break; <Q?F?.^e  
    case VK_CONTROL: >[*qf9$  
     MaskBits|=CTRLBIT; *4Y V v  
     break; {Y9q[D'g.  
    case VK_SHIFT: |ZBI *  
     MaskBits|=SHIFTBIT; tIgN$BHR>  
     break; Y:a]00&)#Y  
    default: //judge the key and send message 1&Zj  
     break; ?FcAXA/J{  
   } ?6Y?a2 |  
   for(int index=0;index<MAX_KEY;index++){ PwLZkr@4^  
    if(hCallWnd[index]==NULL) U4B( #2'  
     continue; +K4}Dmg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n.0fVV-A  
    { ')3 bl3:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); aw42oLk  
     bProcessed=TRUE; H_Q+&9^/  
    } XOS[No~  
   } d/DB nZN  
  } ~Jz6O U*z  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 3$9W%3  
   for(int index=0;index<MAX_KEY;index++){  kPLxEwl  
    if(hCallWnd[index]==NULL) ^ r,=vO  
     continue; :20W\P<O!A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Jg| XH L)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); s-T\r"d=j  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 dlTt _.  
   } B0]~el  
  } s!7y  
 } Y/zj[>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @J`"[%U  
} ?<'}r7D   
O@C@eW#  
  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: jtc]>]6i  
AkQ ~k0i}b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >V}#[/n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _zi|  
.ctw2x5W  
  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: B ,epzI  
5"O.,H}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]3.;PWa:  
{ fS78>*K  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) OYTkV}tG  
 { o:Sa, !DK  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 JrRH\+4K  
  SaveBmp(); F@B]et7  
  return FALSE; b!5~7Ub.No  
 } + @s"zp;F  
 …… //其它处理及默认处理 @QPz #-  
} <lE <f+  
7\Y0z  
_.Uh)-yR  
  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。 Cd}<a?m,  
mSh[}%swj  
  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。 PBTnIU  
6zuTQ^pz  
  二、编程步骤 x)O!["'"  
JO6)-U$7UG  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; N~zdWnSZ@G  
UJ')I`zuI  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; @O^6&\s>  
R)s:rJQ=p  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; a'yK~;+_9  
@>Km_Ax  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Tqn@P  
dn$!&  
  5、 添加代码,编译运行程序。 5IjGm  
4yA+ h2  
三、程序代码 O)n~](sC\  
8\A#CQ5b  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL v\%HPMlh  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9w"4K.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Vd+T$uC  
#if _MSC_VER > 1000 4yr'W8X_  
#pragma once =|y9UlsD  
#endif // _MSC_VER > 1000 nBSYsp{  
#ifndef __AFXWIN_H__ 0gP}zM73  
#error include 'stdafx.h' before including this file for PCH 9W1YW9rL  
#endif Zaf:fsj>  
#include "resource.h" // main symbols 2E)-M9ds  
class CHookApp : public CWinApp h_3E)jc  
{ ]dmrkZz:  
 public: :zke %Yx  
  CHookApp(); qv KG-|j  
  // Overrides w(3G&11N?  
  // ClassWizard generated virtual function overrides o&)8o5  
  //{{AFX_VIRTUAL(CHookApp) &>W$6>@  
 public: goOCu  
  virtual BOOL InitInstance(); ;rGwc$?|  
  virtual int ExitInstance(); Q%f^)HZGR  
  //}}AFX_VIRTUAL S3*`jF>q  
  //{{AFX_MSG(CHookApp) s.QwSbw-g  
  // NOTE - the ClassWizard will add and remove member functions here. hPkWCoQpq  
  // DO NOT EDIT what you see in these blocks of generated code ! m{cGK`/\  
  //}}AFX_MSG 1N#| }ad  
  DECLARE_MESSAGE_MAP() 'ud{m[|  
}; li'YDtMKCY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); J~ zUp(>K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;oKZ!ND  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /}fHt^2H  
BOOL InitHotkey(); 03qQ'pq  
BOOL UnInit(); RYQR(v  
#endif ~IfJwBn-i  
z2_*%S@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. BxWPC#5  
#include "stdafx.h" i$:*Pb3mV  
#include "hook.h" p{ Yv3dNl  
#include <windowsx.h> qYjce]c  
#ifdef _DEBUG 2~1SQ.Q<RY  
#define new DEBUG_NEW y^,1a[U.  
#undef THIS_FILE t?x<g<PJ4  
static char THIS_FILE[] = __FILE__; F|o:W75  
#endif G%AbC"  
#define MAX_KEY 100 L_uVL#To  
#define CTRLBIT 0x04 %S@ZXf~:  
#define ALTBIT 0x02 Jr ,;>   
#define SHIFTBIT 0x01 hz;G$cuEE  
#pragma data_seg("shareddata") 7$vYo _  
HHOOK hHook =NULL; Pw7]r<Q  
UINT nHookCount =0; Yq0| J  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey hk(ZM#Bh  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 0neoE E  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 8>2.UrC  
static int KeyCount =0; 0[NZ>7wqMZ  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1MP~dRZ$  
#pragma data_seg() iZ3IdiZ  
HINSTANCE hins; hYT0l$Ng  
void VerifyWindow(); uy[At+%zg  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) SO|NaqWa  
//{{AFX_MSG_MAP(CHookApp) dh`K`b4I  
// NOTE - the ClassWizard will add and remove mapping macros here. xaq-.IQAM$  
// DO NOT EDIT what you see in these blocks of generated code! lk^Ol&6  
//}}AFX_MSG_MAP UN;H+gNnN  
END_MESSAGE_MAP() (Ft+uuG  
Xy|So|/bKd  
CHookApp::CHookApp() zH?!  
{ LvH 4{B  
 // TODO: add construction code here, M)J5;^["  
 // Place all significant initialization in InitInstance U2tV4_ e  
} b(eNmu  
:}L[sl\R  
CHookApp theApp; 8O5s`qKMYT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sQ UM~HD\a  
{ 9N#_( uwt  
 BOOL bProcessed=FALSE; $-OA'QwB]  
 if(HC_ACTION==nCode) .;y.]Z/;  
 { >Eyt17_H"n  
  if((lParam&0xc0000000)==0xc0000000){// Key up v+W&9>  
   switch(wParam) A2I9R;}  
   { !_]Y~[  
    case VK_MENU: &n}]w+w  
     MaskBits&=~ALTBIT; @ wGPqg  
     break; dc+>m,3$  
    case VK_CONTROL: ^]>O;iB?  
     MaskBits&=~CTRLBIT; j"t(0 m  
     break; vONasD9At  
    case VK_SHIFT: 'Cb6Y#6  
     MaskBits&=~SHIFTBIT; ttaM.  
     break; G)AqbY  
    default: //judge the key and send message zq 3\}9  
     break; px A?  
   } x 77*c._3v  
   for(int index=0;index<MAX_KEY;index++){ bWjc'P6rx  
    if(hCallWnd[index]==NULL) A]_7}<<N  
     continue; \0^Kram>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8 `v-<J  
    { ]{;gw<T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); po c`q5i+  
     bProcessed=TRUE; HDz5&7* .  
    } AmUr.ofu  
   } 3<e=g)F  
  } #>a\>iKQ2q  
  else if((lParam&0xc000ffff)==1){ //Key down I {SjlN}d  
   switch(wParam) XnH05LQ  
   { ^)470K`%)  
    case VK_MENU: H9Gh>u]}  
     MaskBits|=ALTBIT; 2,y|EpG#  
     break; O0*p0J  
    case VK_CONTROL: >1X|^  
     MaskBits|=CTRLBIT; <jBF[v9*m(  
     break; [>vLf2OID  
    case VK_SHIFT: 3xy<tqfr  
     MaskBits|=SHIFTBIT; 4V"E8rUL(  
     break; {Ea b j  
    default: //judge the key and send message ,=uD^n:  
     break; XMCXQs&  
   } h! ,v/7=  
   for(int index=0;index<MAX_KEY;index++) a)!o @  
   { av(6wht8  
    if(hCallWnd[index]==NULL) i:dR\|B  
     continue; eYc$ dPE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mwO6g~@ `  
    { ; t)3F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9v#CE!  
     bProcessed=TRUE; ynp8r f  
    } s `e{}\  
   } M+oHtX$  
  } .zf~.R;>  
  if(!bProcessed){ S0$8@"~=  
   for(int index=0;index<MAX_KEY;index++){ a1+oj7  
    if(hCallWnd[index]==NULL) #j;^\rSv-  
     continue; v<k?Vu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) O/^ %2mG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); V(}:=eK  
   } &.3"Uo\#  
  } pt?bWyKG  
 } @ 8(q$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {.`vs;U  
} ]IaMp788  
}f%}v  
BOOL InitHotkey() ` #0:gEo  
{ D#aDv0b  
 if(hHook!=NULL){ W@>% {eE  
  nHookCount++; xl{=Y< ;  
  return TRUE; bt SRtf  
 } KA5v+~  
 else 39c2pV[  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 'JtBZFq  
  if(hHook!=NULL) "37lx;CH  
   nHookCount++; oE @a'*.\  
  return (hHook!=NULL); Brw@g8w-X  
} SZ7:u895E  
BOOL UnInit() 6dQ-HI*Y#  
{ +:2klJ  
 if(nHookCount>1){ ';k5?^T  
  nHookCount--; E#RDqL*J  
  return TRUE; goNG' o %|  
 } $V;i '(&7  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _{ue8kGt  
 if(unhooked==TRUE){ /A\8 mL8  
  nHookCount=0; S)(.,x  
  hHook=NULL; pp?D7S  
 } uo:J\E  
 return unhooked; &$BjV{,/zc  
} XTs8s12  
j8i[ONq^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >tS'Q`R  
{ k?yoQL*  
 BOOL bAdded=FALSE; (y'hyJo  
 for(int index=0;index<MAX_KEY;index++){ 63iUi9P  
  if(hCallWnd[index]==0){ sfH_5 #w  
   hCallWnd[index]=hWnd; W.jGGt\<\  
   HotKey[index]=cKey; wVXS%4|v  
   HotKeyMask[index]=cMask; 7O2/z:$f  
   bAdded=TRUE; >~rTqtKd  
   KeyCount++; `cn#B BV  
   break; T  wB}l  
  } _%Bi: HG0  
 } CZe ]kXNv  
 return bAdded; ZgJQ?S$D  
}  'c&Ed  
}v;V=%N+v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h f)?1z4  
{ yF:1( 4  
 BOOL bRemoved=FALSE; ;a!S!% .h  
 for(int index=0;index<MAX_KEY;index++){ T"Y+m-<%  
  if(hCallWnd[index]==hWnd){ 234p9A@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  N];NAMp  
    hCallWnd[index]=NULL; ldcqe$7,  
    HotKey[index]=0; &AMl:@p9  
    HotKeyMask[index]=0; lBE= (A`  
    bRemoved=TRUE; w(Ovr`o?9t  
    KeyCount--; f)rq%N &  
    break; y1D L,%j  
   } Y Uc+0  
  } f`(UQJ  
 } q_8+HEvo  
 return bRemoved; ~At7 +F[  
} I|!OY`ko  
yzn%<H~  
void VerifyWindow() TqQB@-!  
{ /<k/7TF`  
 for(int i=0;i<MAX_KEY;i++){ ztY}5A2`  
  if(hCallWnd!=NULL){ Paq4  
   if(!IsWindow(hCallWnd)){ 7+cO_3AB  
    hCallWnd=NULL; E~T-=ocKE  
    HotKey=0; \K{ z  
    HotKeyMask=0; AN m d!  
    KeyCount--; aK~8B_5k8  
   } [aLI '  
  } ;1=1:S8  
 } }&D WaO]J7  
} := V[7n])  
8d{0rqwNE  
BOOL CHookApp::InitInstance() 3`?7 <YJ  
{ 7z,C}-q  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); { uFO/  
 hins=AfxGetInstanceHandle(); =%O6:YM   
 InitHotkey(); 'oVx#w^mf  
 return CWinApp::InitInstance(); 3M`M  
} B-Hrex]  
H41?/U,{  
int CHookApp::ExitInstance() $wa{~'  
{ (lqC[:  
 VerifyWindow(); a-tmq]]E  
 UnInit(); +=h:Vb8  
 return CWinApp::ExitInstance(); Ne!lH@ql  
} KF}hV9IU  
9=tIz  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file H8jpxzXv  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) o/)h"i0P  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >'$Mp<  
#if _MSC_VER > 1000 u#~RkY7s  
#pragma once :OZrH<SW  
#endif // _MSC_VER > 1000 pki%vRY  
.{^5X)  
class CCaptureDlg : public CDialog e9tjw[+A  
{ gJ{)-\  
 // Construction @HCVmg:  
 public: gH vZVC[b  
  BOOL bTray; C) s5D  
  BOOL bRegistered; gD?l-RT>  
  BOOL RegisterHotkey(); r6qj7}\  
  UCHAR cKey; Q&;9 x?e  
  UCHAR cMask; 00y!K m_D  
  void DeleteIcon(); "sCRdx]_  
  void AddIcon(); n>XdU%&  
  UINT nCount; =nS3p6>rZ  
  void SaveBmp(); A)!*]o>U  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 0d&6lqTo  
  // Dialog Data I236 RIq  
  //{{AFX_DATA(CCaptureDlg) G` A4|+W"  
  enum { IDD = IDD_CAPTURE_DIALOG }; BU_nh+dF  
  CComboBox m_Key; 7$=In K  
  BOOL m_bControl; niyV8v  
  BOOL m_bAlt; HV|,}Wks6s  
  BOOL m_bShift; 6{b >p+U  
  CString m_Path; >bW #Zs,6  
  CString m_Number; a=2%4Wmz  
  //}}AFX_DATA bd-L` ={j  
  // ClassWizard generated virtual function overrides Yq KCeg  
  //{{AFX_VIRTUAL(CCaptureDlg) Z9|P'R(l  
 public: 7:1Lol-V  
  virtual BOOL PreTranslateMessage(MSG* pMsg); fZF@k5*\  
 protected: 5]0 <9a  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }7Q%6&IR  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); l_p2Riv  
  //}}AFX_VIRTUAL Nf\LN$ &8  
  // Implementation K|, .C[  
 protected: l f, 5w  
  HICON m_hIcon; 02^rV*re  
  // Generated message map functions 0H:X3y+  
  //{{AFX_MSG(CCaptureDlg) ;Y, y4{H3  
  virtual BOOL OnInitDialog(); W<g1<z\f  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); M= (u]%\  
  afx_msg void OnPaint(); <P_-s*b  
  afx_msg HCURSOR OnQueryDragIcon(); Dd|VMW=  
  virtual void OnCancel(); &D<yX~  
  afx_msg void OnAbout(); x%B%f`]8  
  afx_msg void OnBrowse(); ? J0y|  
  afx_msg void OnChange(); l/5 hp.  
 //}}AFX_MSG 6gDN`e,@  
 DECLARE_MESSAGE_MAP() _[BP 0\dPW  
}; J&_n9$  
#endif FSO).=#  
He@KV=  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :ws<-Qy  
#include "stdafx.h" {.Jlbi9!  
#include "Capture.h" d=/F}yP~?s  
#include "CaptureDlg.h" %cn<ych G  
#include <windowsx.h> 8oGRLYU N  
#pragma comment(lib,"hook.lib") h(DTa  
#ifdef _DEBUG 6u6x  
#define new DEBUG_NEW [-w%/D%@  
#undef THIS_FILE o8MZiU1Xf  
static char THIS_FILE[] = __FILE__; gX@aG9  
#endif !4!~L k=  
#define IDM_SHELL WM_USER+1 \;Weizq5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |7~<Is~ *  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4+tEFxvX&  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3so %gvY.'  
class CAboutDlg : public CDialog zt%Mx>V@  
{ ;Rf'P}"]  
 public: Z_NCD`i;  
  CAboutDlg(); eMzk3eOJ  
  // Dialog Data I/N *gy?*  
  //{{AFX_DATA(CAboutDlg) 7+*WH|Z@  
  enum { IDD = IDD_ABOUTBOX }; vDvFL<`vmD  
  //}}AFX_DATA :!QAC@  
  // ClassWizard generated virtual function overrides j<$2hiI/?&  
  //{{AFX_VIRTUAL(CAboutDlg) EQ_aa@M7  
 protected: ssL\g`xe  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Wp,R ^d  
  //}}AFX_VIRTUAL *zLMpL_  
  // Implementation ~LC-[&$  
 protected: 30{ gI0jk  
  //{{AFX_MSG(CAboutDlg) FI.\%x  
  //}}AFX_MSG Hr C+Yjp  
  DECLARE_MESSAGE_MAP() H?w6C):]  
}; i/.6>4tE:  
A}!J$V:w]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &,/ S`ke=  
{ @)}L~lb[)  
 //{{AFX_DATA_INIT(CAboutDlg) Gm`8q}<I  
 //}}AFX_DATA_INIT W*G<X.Hf  
} +`15le`R  
OTv)  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) F"kAkX>3}  
{ 8EYkQ  
 CDialog::DoDataExchange(pDX); Ul# r  
 //{{AFX_DATA_MAP(CAboutDlg) /_.|E]  
 //}}AFX_DATA_MAP jWgX_//!  
} {{1G`;|v 9  
%2h>-.tY  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g2]Qv@nxw  
 //{{AFX_MSG_MAP(CAboutDlg) ykJ>*z  
 // No message handlers ]@TCk8d$0  
 //}}AFX_MSG_MAP AFn7uW!9Gw  
END_MESSAGE_MAP() wM{s|Ay  
8,|kao:  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) d_ CT $  
: CDialog(CCaptureDlg::IDD, pParent) T4F/w|Q  
{ z!\*Y =e  
 //{{AFX_DATA_INIT(CCaptureDlg) 62u4-}JzF  
  m_bControl = FALSE; 1mJ Hued=6  
  m_bAlt = FALSE; < Z$J<]I  
  m_bShift = FALSE; }2oc#0  
  m_Path = _T("c:\\"); (% 9$!v{3  
  m_Number = _T("0 picture captured."); |?9HU~B  
  nCount=0; ('~LMu_  
  bRegistered=FALSE; R#KU^]"(  
  bTray=FALSE; M%#e1"n  
 //}}AFX_DATA_INIT *ui</+  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6C)_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); h];I{crh  
} AwN!;t_0+N  
L(\cHb9`  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) kVL.PY\K  
{ P;*(hY5&  
 CDialog::DoDataExchange(pDX); w =KPT''!  
 //{{AFX_DATA_MAP(CCaptureDlg) QW"! (`K  
  DDX_Control(pDX, IDC_KEY, m_Key); Ts9uL5i  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); @ P|y{e6  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Pc9H0\+Xk  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); W!<U85-#S  
  DDX_Text(pDX, IDC_PATH, m_Path); ite~E5?#  
  DDX_Text(pDX, IDC_NUMBER, m_Number); _*zt=zn>  
 //}}AFX_DATA_MAP @ |r{;'  
} }\LQ3y"[  
<vP=zk  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) f 1d?.)  
//{{AFX_MSG_MAP(CCaptureDlg) 7o4\oRGV  
 ON_WM_SYSCOMMAND() _-\#i  
 ON_WM_PAINT() uw7zWJ n  
 ON_WM_QUERYDRAGICON() {b{s<@?  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ~5g~;f[4  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) YK\X+"lB  
 ON_BN_CLICKED(ID_CHANGE, OnChange) x"~JR\yzKJ  
//}}AFX_MSG_MAP <QvOs@i*  
END_MESSAGE_MAP() (#'>(t(4  
9B4&m|g  
BOOL CCaptureDlg::OnInitDialog() n*$ g]G$  
{ o}!PQ#`M  
 CDialog::OnInitDialog(); Lr<cMK<  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); W4N{S.#!  
 ASSERT(IDM_ABOUTBOX < 0xF000); {8aTV}Ha2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); n|;Im&,  
 if (pSysMenu != NULL)  )*[3Vq  
 { M_8{]uo  
  CString strAboutMenu; xfQ1T)F3g  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 26nx`w?j(  
  if (!strAboutMenu.IsEmpty()) v:U-6W_)|  
  { 8_8l.!~  
   pSysMenu->AppendMenu(MF_SEPARATOR); &NWEqBz*2  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `9 L>*  
  } KSvE~h[#+  
 } :r[`.`  
 SetIcon(m_hIcon, TRUE); // Set big icon ]oxZ77ciL  
 SetIcon(m_hIcon, FALSE); // Set small icon &vJH$R  
 m_Key.SetCurSel(0); pFXEu= $3  
 RegisterHotkey(); w@b)g  
 CMenu* pMenu=GetSystemMenu(FALSE); /\Ef%@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); q@qsp&0/  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); eJSxn1GW  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); +H.`MZ=  
 return TRUE; // return TRUE unless you set the focus to a control xmG<]WF>E  
} M{\I8oOg  
*Uh!>Iv;  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) /mMV{[  
{ rZF*q2?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) hc1N ~$3!G  
 { U17d>]ka  
  CAboutDlg dlgAbout; Th%zn2R B  
  dlgAbout.DoModal(); nEfK53i_  
 } ?(PKeq6  
 else :+Z%; Dc  
 { \lY_~*J  
  CDialog::OnSysCommand(nID, lParam); ebq4g387X  
 } :U\tv[  
} !W\+#ez  
DqPw#<"H  
void CCaptureDlg::OnPaint() ~?dI*BZ)]  
{ Z G:{[sT  
 if (IsIconic()) XG?8s &  
 { yX5\gO6G  
  CPaintDC dc(this); // device context for painting B[}6-2<>?C  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); B1gR5p0  
  // Center icon in client rectangle b'g )  
  int cxIcon = GetSystemMetrics(SM_CXICON); cS$_\65  
  int cyIcon = GetSystemMetrics(SM_CYICON); i1085ztN  
  CRect rect;  bLL2  
  GetClientRect(&rect); [?gP;,  
  int x = (rect.Width() - cxIcon + 1) / 2; E{\2='3\  
  int y = (rect.Height() - cyIcon + 1) / 2; >ef6{URy<  
  // Draw the icon Q/?$x*\>  
  dc.DrawIcon(x, y, m_hIcon); $j~RWfw-  
 } }b}m3i1  
 else #G3<7PK  
 { So6x"1B  
  CDialog::OnPaint(); <%^&2UMg  
 } fJ\[*5eiS  
} rjP/l6 ~'  
h;Qk @F  
HCURSOR CCaptureDlg::OnQueryDragIcon() l}h!B_P'  
{ "tZe>>I  
 return (HCURSOR) m_hIcon; maZ)cW?  
} m~|40)   
"MsIjSu  
void CCaptureDlg::OnCancel() 54,er$$V  
{ ~Ei<Z`3}7"  
 if(bTray) 5G#n"}T  
  DeleteIcon(); RCrCs  
  CDialog::OnCancel(); <b.D&  
} #4:?gfIj  
 }ZI7J  
void CCaptureDlg::OnAbout() l{9Y  
{ "Q<MS'a  
 CAboutDlg dlg; wzA$'+Mb  
 dlg.DoModal(); SM '|+ d  
} wkq 66?  
3$tdwe$S  
void CCaptureDlg::OnBrowse() b>|6t~}M  
{ (Z*!#}z`  
 CString str; |pK !S  
 BROWSEINFO bi; mw!F{pw  
 char name[MAX_PATH]; `uFdwO'DD  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /z!%d%"  
 bi.hwndOwner=GetSafeHwnd(); ^~dWU>  
 bi.pszDisplayName=name; ZNoDFf*h  
 bi.lpszTitle="Select folder"; 8}[).d160  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; !VJoM,b8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ixFi{_  
 if(idl==NULL) d$RIS+V  
  return; #R"*c hLV  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2iOV/=+  
 str.ReleaseBuffer(); UZMd~|  
 m_Path=str; F847pyOJnf  
 if(str.GetAt(str.GetLength()-1)!='\\') M7T5 ~/4  
  m_Path+="\\"; )UR7i8]!0  
 UpdateData(FALSE); DrR@n~  
} :]KAkhFkbb  
O?2DQY?jT  
void CCaptureDlg::SaveBmp() f?Lw)hMrA  
{ o4X{L`m  
 CDC dc; 2 nCA<&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Oz95  
 CBitmap bm; u[YGm:}  
 int Width=GetSystemMetrics(SM_CXSCREEN); gJXaPJA{  
 int Height=GetSystemMetrics(SM_CYSCREEN); nKY6[|!#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); wj,=$RX  
 CDC tdc; cr3^6HB  
 tdc.CreateCompatibleDC(&dc); {.yB'.k?  
 CBitmap*pOld=tdc.SelectObject(&bm); DU S6SO  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); J zl6eo[;  
 tdc.SelectObject(pOld); CrLrw T  
 BITMAP btm; }tz7b#  
 bm.GetBitmap(&btm); 0S"MC9beg  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; G[=c Ss,  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); l **X^+=$  
 BITMAPINFOHEADER bih; n S=W1zf  
 bih.biBitCount=btm.bmBitsPixel; w{KavU5W  
 bih.biClrImportant=0; ]G\}k  
 bih.biClrUsed=0; }7Uoh(d  
 bih.biCompression=0; g#bRT*,L  
 bih.biHeight=btm.bmHeight; kmW4:EA%  
 bih.biPlanes=1; GOPfXtkC  
 bih.biSize=sizeof(BITMAPINFOHEADER); hb$Ce'}N  
 bih.biSizeImage=size; ;u JMG  
 bih.biWidth=btm.bmWidth; ?4,T}@P  
 bih.biXPelsPerMeter=0; j%kncGS  
 bih.biYPelsPerMeter=0; TOt dUO  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);  ];m_4  
 static int filecount=0; Vr}'.\$  
 CString name; COlqcq'qAu  
 name.Format("pict%04d.bmp",filecount++); 'L'R9&o<X  
 name=m_Path+name; -RwE%  cr  
 BITMAPFILEHEADER bfh; sRs>"zAg  
 bfh.bfReserved1=bfh.bfReserved2=0; m0wDX*Qn  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 9{l}bu/u  
 bfh.bfSize=54+size; lxx2H1([  
 bfh.bfOffBits=54; C+$#y2"z#n  
 CFile bf; jcOcWB|  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?s01@f#  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); C dn J&N{  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); /v{I  
  bf.WriteHuge(lpData,size); [0!(xp^  
  bf.Close(); 3og.y+.=U.  
  nCount++; D*jM1w_`  
 } 04ui`-c(  
 GlobalFreePtr(lpData); ( .:e,l{U%  
 if(nCount==1) pK*TE5]  
  m_Number.Format("%d picture captured.",nCount); I7onX,U+  
 else D.:Zx  
  m_Number.Format("%d pictures captured.",nCount); ?<!|  
  UpdateData(FALSE); )lkjqFQ(  
} *4'"2"  
7CysfBF0g  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) i!Ba]n   
{ 6nn *]|7  
 if(pMsg -> message == WM_KEYDOWN) t@(HF-4~=  
 { 4#D,?eA7  
  if(pMsg -> wParam == VK_ESCAPE) }BEB1Q}L  
   return TRUE; 6ujW Nf  
  if(pMsg -> wParam == VK_RETURN) \fOEqe*5SM  
   return TRUE; Rq-ZL{LR7  
 } wYea\^co  
 return CDialog::PreTranslateMessage(pMsg); }f ?y* H  
} ).O)p9  
}e1ZbmW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?ub35NLa  
{ @7 }W=HB  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %d @z39-;  
  SaveBmp(); ?,/ }`3Vw  
  return FALSE; '/p4O2b,  
} Wwo0%<2y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ vN $s|R'@  
 CMenu pop; 6Wn1{v0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); bA 2pbjg=  
 CMenu*pMenu=pop.GetSubMenu(0); TeQV?ZQ#}  
 pMenu->SetDefaultItem(ID_EXITICON); %b0*H_ok7  
 CPoint pt; ceA9) {  
 GetCursorPos(&pt); _1^'(5f$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); /v}`l  
 if(id==ID_EXITICON) #yen8SskB  
  DeleteIcon(); )oZ dj`  
 else if(id==ID_EXIT) NK+o1   
  OnCancel(); ]:;&1h3'7  
 return FALSE; [ ~,AfY  
} x-c"%Z|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); WIOV2+  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Bvj0^fSm  
 AddIcon(); pAEx#ck  
 return res; *hrd5na  
} u2I Cl  
Ac6=(B  
void CCaptureDlg::AddIcon() 5;?yCWc  
{ 9mgIUjz  
 NOTIFYICONDATA data; <3iMRe  
 data.cbSize=sizeof(NOTIFYICONDATA); rNM;ZPF#  
 CString tip; POW>~Tof1  
 tip.LoadString(IDS_ICONTIP); GILfbNcd  
 data.hIcon=GetIcon(0); 8MBAtVmy  
 data.hWnd=GetSafeHwnd(); ;<5q]/IHK  
 strcpy(data.szTip,tip); s{++w5s  
 data.uCallbackMessage=IDM_SHELL; wr4:Go`  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; N [@?gFtT  
 data.uID=98; E]6 6]+;0_  
 Shell_NotifyIcon(NIM_ADD,&data); <#.g=ay  
 ShowWindow(SW_HIDE); b -y  
 bTray=TRUE; wBzC5T%,  
} AGno6g  
wzaV;ac4K  
void CCaptureDlg::DeleteIcon() B *vM0  
{ |%wX*zaf  
 NOTIFYICONDATA data; 8fb'yjIC  
 data.cbSize=sizeof(NOTIFYICONDATA); ^{{q V  
 data.hWnd=GetSafeHwnd(); (t.Nk[  
 data.uID=98; JRFtsio*  
 Shell_NotifyIcon(NIM_DELETE,&data); `6YN3XS  
 ShowWindow(SW_SHOW); zQA`/&=Y  
 SetForegroundWindow(); *A< 5*Db:F  
 ShowWindow(SW_SHOWNORMAL); b[yiq$K/  
 bTray=FALSE; 2tLJU  Z1  
} 5r_|yu  
:EH=_"  
void CCaptureDlg::OnChange() >+waX "e  
{ r/sNrB1U"y  
 RegisterHotkey(); X.V~SeS  
} GL JMP^p  
.2pK.$.  
BOOL CCaptureDlg::RegisterHotkey() [Yyk0Qv|4  
{ OTp]Xe/  
 UpdateData(); P$sxr  
 UCHAR mask=0; &R siVBA  
 UCHAR key=0; IAEAhqp  
 if(m_bControl) 2Hdu:"j  
  mask|=4; fLVAKn  
 if(m_bAlt) qNr} \J|  
  mask|=2; &?vgP!d&M  
 if(m_bShift) P_dJZ((X  
  mask|=1; TKjFp%  
  key=Key_Table[m_Key.GetCurSel()]; ?8 {"x8W;  
 if(bRegistered){ {|\.i  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); RL<c>PY  
  bRegistered=FALSE; ?}7p"3j'z  
 } q9NoI(]e  
 cMask=mask; lLD12d  
 cKey=key; Ewm9\qmg  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); '2O\_Uz  
 return bRegistered; >f'g0g  
} 8X0z~ &  
};g"GNy  
  四、小结  XlJZhc  
x`?3C"N:<  
  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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