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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: a,3j,(3  
  T_X6Ulp  
  一、实现方法 mK[)mC _8  
Qhs/E`k4  
  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: I6j$X6u  
,QC{3i~  
#pragma data_seg("shareddata") XGJj3-eW {  
HHOOK hHook =NULL; //钩子句柄 76wc,+  
UINT nHookCount =0; //挂接的程序数目 l_EM8pL,f  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 oHMo>*?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 qzI&<4  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey $KUo s+%  
static int KeyCount =0; qP2ekI:y  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 7a#4tqM#  
#pragma data_seg() e?`5>& Up  
N-jTc?mT~&  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 "8 ~:[G#  
Glxuz0]  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: N;Dni#tQ`  
O$D'.t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR zS\E/.X2  
cKey,UCHAR cMask) n8uv#DsdK  
{ I&MY{f  
 BOOL bAdded=FALSE; a\IP12F?  
 for(int index=0;index<MAX_KEY;index++){ *5 |)-E  
  if(hCallWnd[index]==0){ u)3 $~m~  
   hCallWnd[index]=hWnd; &=<x#h-  
   HotKey[index]=cKey; g8Q5m=O*  
   HotKeyMask[index]=cMask; !Gu%U$d  
   bAdded=TRUE; N>Eqj>G  
   KeyCount++; `(v='$6}  
   break; O=v#{ [  
  } -od!J\ KCy  
 } fbWFLS m;  
 return bAdded; L f"i !  
} y;t6sM@  
//删除热键 @[#$J0q q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s <   
{ W?0 lV5/  
 BOOL bRemoved=FALSE; YoN*:jB<M  
 for(int index=0;index<MAX_KEY;index++){ bV edFm  
  if(hCallWnd[index]==hWnd){ P~s$EJL*  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ D'L'#/hK  
    hCallWnd[index]=NULL; 4J;-Dq  
    HotKey[index]=0; -RO7 'm0  
    HotKeyMask[index]=0; r|PFw6  
    bRemoved=TRUE; /&CmO>^e  
    KeyCount--; d)@<W1;  
    break; 1z&Ly3  
   } Ubh{!Y  
  } 1QcT$8HA  
 } < 'f dkW  
 return bRemoved; &;XAuDw4+i  
} Eo\UAc  
j. *VJazb;  
KhCzD[tf  
  DLL中的钩子函数如下: TMs,j!w?I  
Mva3+T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) O(tX8P Q5N  
{ }tH[[4tw,  
 BOOL bProcessed=FALSE; nSF``pp+  
 if(HC_ACTION==nCode) uch>AuF:  
 { p8kr/uMP ;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 R)M_|ca  
   switch(wParam) f6_];]yP  
   {  /;7y{(o  
    case VK_MENU: |J+(:{ }~  
     MaskBits&=~ALTBIT; f;&]:2.j  
     break; bHht d_}  
    case VK_CONTROL: V?P,&c?84  
     MaskBits&=~CTRLBIT; ~by]xE1Eg  
     break; UOGuqV-  
    case VK_SHIFT: !ALKSiSl  
     MaskBits&=~SHIFTBIT; j4>a(  
     break; s:2|c]wQ#R  
    default: //judge the key and send message jn%!AH  
     break; ybeKiv9  
   } K,6b3kk  
   for(int index=0;index<MAX_KEY;index++){ kloR#?8A  
    if(hCallWnd[index]==NULL) :Gu+m  
     continue;  QV h4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~_9n.C  
    { EyI}{6~F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4-kZJ\]  
     bProcessed=TRUE; !IC-)C,q  
    } bae\Zk%`^  
   } &-czStQ  
  } [U@ *1  
  else if((lParam&0xc000ffff)==1){ //有键按下 "+z?x~rk  
   switch(wParam) K]qM~v<A  
   { R64!>o"nED  
    case VK_MENU: T;diNfgg  
     MaskBits|=ALTBIT; s-Aw<Q)d  
     break; :LWn<,4F&  
    case VK_CONTROL: RbGJ)K!  
     MaskBits|=CTRLBIT; 9prU+9  
     break; SFb{o <0 =  
    case VK_SHIFT: nLwiCf e  
     MaskBits|=SHIFTBIT; zW}[+el }  
     break; Io|X#\K  
    default: //judge the key and send message g ^!C  
     break; a8dXH5_  
   } rrnNn'  
   for(int index=0;index<MAX_KEY;index++){ u>Rb ?`  
    if(hCallWnd[index]==NULL) 'lo  
     continue; o7TN,([W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RQkyCAGx  
    { $55U+)C<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X; 5Jb  
     bProcessed=TRUE; k-E{d04-2  
    } F,GN[f-  
   } 4D$;KokZ  
  } yoRU_%xA  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 hH->%*  
   for(int index=0;index<MAX_KEY;index++){ >tG+?Y'{  
    if(hCallWnd[index]==NULL) ? b[n|^wS  
     continue; C{Asp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) MlJVeod  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (>=7ng^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2/36dGFH  
   } 0Rz(|jlbS  
  } j'HkBW:L  
 } 2$ !D* <  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); wNNB;n` l  
} 2b=)6H1  
B51kV0  
  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: LhzMAW<L4  
RA],lNs  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >r)X:K+I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); QC0!p"  
GIftrYr  
  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: D -IR!js ]  
~:lKS;PRuK  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) o5Y2vmz?9  
{ F52B~@ .  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) _Mc>W0'5@  
 { "BVdPSDBk  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 xM s]Hs  
  SaveBmp(); /u`3VOn  
  return FALSE; WlV z,t'if  
 } F?u^"}%Fc  
 …… //其它处理及默认处理 y^Vw`-e  
} 1ndJ+H0H  
w %c  
maSgRf[g  
  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。 J^m<*  
sT1&e5`W  
  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。 ~vgA7E/XV  
aF8k/$u  
  二、编程步骤 /}5B&TZ=(3  
 T7$S_  
  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"; V5D2\n3A  
wP"q<W g  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; K{cbn1\,H  
cPn+<M#  
  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; ,>LRa  
la$%H<,7  
  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; p" `%  
c 5`US  
  5、 添加代码,编译运行程序。 68R1AqU_  
~V)?>)T  
三、程序代码 ~S; Z\  
% *z-PT22  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL mzD^ Y<LTd  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) uXQ >WI@eF  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "DSPPE&[c  
#if _MSC_VER > 1000 5V-jMB  
#pragma once $R^AEa7  
#endif // _MSC_VER > 1000 Q;h3v1GC\P  
#ifndef __AFXWIN_H__ |@j _2Q,  
#error include 'stdafx.h' before including this file for PCH +&ZX$  
#endif .~=HgOJ  
#include "resource.h" // main symbols ,smF^l   
class CHookApp : public CWinApp Psa@@'w  
{ znZ7*S >6\  
 public: ~# 7wdP  
  CHookApp(); uCzii o`S  
  // Overrides Y:x/!-  
  // ClassWizard generated virtual function overrides V*65b(q)  
  //{{AFX_VIRTUAL(CHookApp) AxCI 0  
 public: PI|`vC|yy&  
  virtual BOOL InitInstance(); VY'Q|[  
  virtual int ExitInstance(); ; !$m1  
  //}}AFX_VIRTUAL dEp/dd~(&  
  //{{AFX_MSG(CHookApp) Jm(ixekp  
  // NOTE - the ClassWizard will add and remove member functions here. =qoRS0Qa  
  // DO NOT EDIT what you see in these blocks of generated code ! 2H[)1|]l  
  //}}AFX_MSG ~U}Mv{ y  
  DECLARE_MESSAGE_MAP() noA-)  
}; .Gb+\E{M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); *j*Du+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0jB X5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +nZRi3yu=  
BOOL InitHotkey(); $V8vrT#:  
BOOL UnInit(); *,#q'!Hq  
#endif s` >H  
"dN < i  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. K5 vNhA  
#include "stdafx.h" ,9ml>ji`=  
#include "hook.h" ValS8V*N1  
#include <windowsx.h> ]TK=>;&  
#ifdef _DEBUG \3{3ly~L  
#define new DEBUG_NEW ,5-Zb3\  
#undef THIS_FILE D6=HYqdj  
static char THIS_FILE[] = __FILE__; Etmo7 8e  
#endif dl[ob,aCK  
#define MAX_KEY 100 ` %' z  
#define CTRLBIT 0x04 Fu0.~w  
#define ALTBIT 0x02 yMIT(  
#define SHIFTBIT 0x01 4DML  
#pragma data_seg("shareddata") INLf#  N  
HHOOK hHook =NULL; ` *9EKj  
UINT nHookCount =0; 8[\ 79|  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey rycJyiw<-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &|z544  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey I #l;~a<9z  
static int KeyCount =0; nGZ \<-  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift b:x7)$(  
#pragma data_seg() |(%AM*n  
HINSTANCE hins; a"qR J-@  
void VerifyWindow(); u&3EPu  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) m'.T2e.u  
//{{AFX_MSG_MAP(CHookApp) RV]a%mVlM  
// NOTE - the ClassWizard will add and remove mapping macros here. 7x+=7,BZd  
// DO NOT EDIT what you see in these blocks of generated code! %<S7  
//}}AFX_MSG_MAP pYGYy'%A'  
END_MESSAGE_MAP() ^?Vq L\V5  
JTkCk~bX[z  
CHookApp::CHookApp() b3^R,6]x&  
{ j&llrN  
 // TODO: add construction code here, z\h, SX<U  
 // Place all significant initialization in InitInstance rIp'vy S\p  
} ;zm ks]  
^^Bm$9  
CHookApp theApp; x?>!UqgkY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) JB'qiuhab  
{ ~GYpa t  
 BOOL bProcessed=FALSE; E~69^ cd  
 if(HC_ACTION==nCode) \vs%U}IrO  
 { 1bDJ}M~]z  
  if((lParam&0xc0000000)==0xc0000000){// Key up .='3bQ(UZ4  
   switch(wParam) CMKhS,,o  
   { ) 1BiEK`v  
    case VK_MENU: J2Y 3er  
     MaskBits&=~ALTBIT; B^Bbso'{1  
     break; 7zi"caY  
    case VK_CONTROL: j`+0.Zlq  
     MaskBits&=~CTRLBIT; ^VC7C~NZ!M  
     break; Y"s )u7  
    case VK_SHIFT: 7rJ9 }/<I  
     MaskBits&=~SHIFTBIT; `L+ ~&M  
     break; +0dQORo  
    default: //judge the key and send message kkHTbn=!  
     break; 7s$6XO!  
   } `6n!$Cxo  
   for(int index=0;index<MAX_KEY;index++){ Y+OYoI  
    if(hCallWnd[index]==NULL) _u`B3iG  
     continue; 6S2r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lJ("6aT?  
    { rS=tcB O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $]Rl__;  
     bProcessed=TRUE; oMz/sL'u  
    } 5_PWGaQa  
   } s&Z35IM8|  
  } p9k4w% ~:  
  else if((lParam&0xc000ffff)==1){ //Key down e2q pJ4i  
   switch(wParam) .<0=a|IAz  
   { 9PUa?Bc`=  
    case VK_MENU: v hR twi  
     MaskBits|=ALTBIT; K`,nW6\  
     break; $dr27tse&<  
    case VK_CONTROL: V> 1D1  
     MaskBits|=CTRLBIT; y4 dp1<t%  
     break; kT>r<`rt  
    case VK_SHIFT: e!.7no  
     MaskBits|=SHIFTBIT; Y>(ZsHu  
     break; mL8A2>Gig  
    default: //judge the key and send message -qs(2^  
     break; ,*q#qW!!  
   } :,urb*  
   for(int index=0;index<MAX_KEY;index++) :~WPY9i`  
   { D$Kz9GVZq  
    if(hCallWnd[index]==NULL) y*y`t6D  
     continue; e~tr^$/(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) iLjuE)6-$  
    { d3\OHkM0^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9k(*?!\;  
     bProcessed=TRUE; rSM$E  
    } DxE^#=7iH;  
   } 2Px$0&VN  
  } Mp]yKl  
  if(!bProcessed){ m OwWg  
   for(int index=0;index<MAX_KEY;index++){ j` [#Ij  
    if(hCallWnd[index]==NULL) eL]{#WL  
     continue; RPz!UMQSD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;"d?_{>7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7Qm;g-)f  
   } =)mXCA^  
  } ({D}QEP  
 } SJ1w1^#Pz  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e6tH/`Uln  
} N*_/@qM> a  
z Y$X|= f  
BOOL InitHotkey() HA$^ *qn  
{ zz7Y/653  
 if(hHook!=NULL){ 4iYgs-,  
  nHookCount++; %RCl+hOP.h  
  return TRUE; ]+^;vc 1r  
 } s_S<gR  
 else i6meY$l  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); N#<zEAB  
  if(hHook!=NULL) O;"*_Xq(`  
   nHookCount++; ~rVKQ-+4&  
  return (hHook!=NULL); "N?%mCPI  
} #i`A4D  
BOOL UnInit() d,GtH)(s  
{ [u`17hyX  
 if(nHookCount>1){ o 2[vM$]  
  nHookCount--; z5|e\Z  
  return TRUE; hLDch5J5~  
 } c+,7Zu!  
 BOOL unhooked = UnhookWindowsHookEx(hHook); x>1iIpBv^  
 if(unhooked==TRUE){ wGov|[X  
  nHookCount=0; dv1x 78xG>  
  hHook=NULL; +cPE4(d  
 } \Owful  
 return unhooked; nG4Uk2>  
} yFPaWW  
8o8b'tW^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b7W=HR  
{ `:-@E2  
 BOOL bAdded=FALSE; Z@>=&  
 for(int index=0;index<MAX_KEY;index++){ Rye ~w6  
  if(hCallWnd[index]==0){ O<eWq]  
   hCallWnd[index]=hWnd; |Ak =-.  
   HotKey[index]=cKey; 4~m.#6MT  
   HotKeyMask[index]=cMask; cu.*4zs  
   bAdded=TRUE; 4Vb}i[</  
   KeyCount++; 6b#:H~ <  
   break; zkT`] @`J  
  } 3<e(@W}n-M  
 } p]1yd;Jt  
 return bAdded; xN{"%>Mx  
}  c{f:5 p  
v -|P_O&z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %-1BA *J`|  
{ ex@,F,u>o  
 BOOL bRemoved=FALSE; E1U4v&P  
 for(int index=0;index<MAX_KEY;index++){ A}t&-  
  if(hCallWnd[index]==hWnd){ .b_0k<M!p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %h/#^esi  
    hCallWnd[index]=NULL; ^\7 x5gO  
    HotKey[index]=0; 2$SofG6D}  
    HotKeyMask[index]=0; ]RJb;  
    bRemoved=TRUE; Oet#wp/I  
    KeyCount--; 1Rb XM n  
    break; !yV,|)y5F  
   } Th& Wq  
  } DJD]aI  
 } |%2/I>o  
 return bRemoved; =,>TpE  
} 'Ec:l(2Ec  
@~!-a s7  
void VerifyWindow() 6`s%%v  
{ v3hQv)j)  
 for(int i=0;i<MAX_KEY;i++){ St~SiTJU  
  if(hCallWnd!=NULL){ T~wZ  
   if(!IsWindow(hCallWnd)){ I\Gp9w0f  
    hCallWnd=NULL; HP4'8#3o  
    HotKey=0; 3j=%De  
    HotKeyMask=0; \CJx=[3(  
    KeyCount--; bCE7hutl  
   } M0Kh>u  
  } IQk#  
 } 8f{}ce'E*  
} 4B3irHs\Q  
dm/\uE'l  
BOOL CHookApp::InitInstance() Hl3XqR  
{ j J`Zz  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); .5KC'?  
 hins=AfxGetInstanceHandle(); guUr1Ij  
 InitHotkey(); ~J. Fl[  
 return CWinApp::InitInstance(); QNa}M{5>h  
} ${I@YSU  
aaf_3UH.B  
int CHookApp::ExitInstance() xvx\H'  
{ _;J9q}X  
 VerifyWindow(); ]"7DV3_  
 UnInit(); YPff)0Nh  
 return CWinApp::ExitInstance(); A9qO2kq7_  
}  wc+N  
rlO%%Qn`  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Dt~}9HrU  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) x@ s`;qz  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ n6!Ihip$  
#if _MSC_VER > 1000 Zs5I?R1e8  
#pragma once "$E!_  
#endif // _MSC_VER > 1000 yd2qf  
|`(?<m  
class CCaptureDlg : public CDialog evmEX<N  
{ q@M jeGs%  
 // Construction yu?s5  
 public: jC Kt;lj  
  BOOL bTray; \'LCC-  
  BOOL bRegistered; i!d7,>l+Q~  
  BOOL RegisterHotkey(); `Z7ITvF>  
  UCHAR cKey; M%5$-;6~_  
  UCHAR cMask;  4Jk}/_  
  void DeleteIcon(); @6!y(e8"J]  
  void AddIcon(); SJ[@fUxO)  
  UINT nCount; :D+ SY  
  void SaveBmp(); klC^xSx  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor h%w\O Z7  
  // Dialog Data )p^jsv.  
  //{{AFX_DATA(CCaptureDlg) pTX'5   
  enum { IDD = IDD_CAPTURE_DIALOG }; _g`0td>N  
  CComboBox m_Key; FTYLMQ i  
  BOOL m_bControl; K!: ,l  
  BOOL m_bAlt; vYt:}$AE  
  BOOL m_bShift; h'y@M+c(  
  CString m_Path; "0 PN  
  CString m_Number; iBiA0 W  
  //}}AFX_DATA ^$Io;*N4  
  // ClassWizard generated virtual function overrides /qq&'}TZP  
  //{{AFX_VIRTUAL(CCaptureDlg) ihBl",l&Hq  
 public: N evvA(M  
  virtual BOOL PreTranslateMessage(MSG* pMsg); XsN#<"f;i  
 protected: n#4J]Z@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0l1]QD+Gc5  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :*Ggz|  
  //}}AFX_VIRTUAL h7]]F{r5  
  // Implementation x5 ~E'~_  
 protected: vlN. OQ  
  HICON m_hIcon; P[P72WR  
  // Generated message map functions cf!k 9x9Z  
  //{{AFX_MSG(CCaptureDlg) B*iz+"H  
  virtual BOOL OnInitDialog(); K9M.+d4  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); XK/@!ud"`  
  afx_msg void OnPaint(); g~H? l3v  
  afx_msg HCURSOR OnQueryDragIcon(); v8k ^=A:  
  virtual void OnCancel(); U?^|>cMr  
  afx_msg void OnAbout(); taEMr> /  
  afx_msg void OnBrowse(); ;_\  
  afx_msg void OnChange(); 5)v^ cR?&  
 //}}AFX_MSG '*ICGKoT  
 DECLARE_MESSAGE_MAP() q4ko}jn  
}; >(ww6vk2  
#endif (dip Ks?K  
:*+BBC  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +2 o|#`)i  
#include "stdafx.h" >~>[}d;glw  
#include "Capture.h" l<: E+lU  
#include "CaptureDlg.h" %R"/`N9R,  
#include <windowsx.h> ~+nSI-L  
#pragma comment(lib,"hook.lib") =l'_*B8  
#ifdef _DEBUG a[cH@7W.#  
#define new DEBUG_NEW 3M*[a~  
#undef THIS_FILE 1sLfjH hv  
static char THIS_FILE[] = __FILE__; d>98 E9  
#endif RcM0VbR"EU  
#define IDM_SHELL WM_USER+1 P]x+Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 64>[pZF8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t-(7Q8(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; W}_}<rlF  
class CAboutDlg : public CDialog *dTf(J  
{ 3}1+"? s  
 public: ^JDV4>S\  
  CAboutDlg(); DmPsltpzQ  
  // Dialog Data j77}{5@p  
  //{{AFX_DATA(CAboutDlg) FOG+[v  
  enum { IDD = IDD_ABOUTBOX }; TC#B^m`'p  
  //}}AFX_DATA x2wWp-Z  
  // ClassWizard generated virtual function overrides 3 v$4LY  
  //{{AFX_VIRTUAL(CAboutDlg) Zs|sPatV<  
 protected: %9Fg1LH42r  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M%^laf  
  //}}AFX_VIRTUAL PQ1NQy8  
  // Implementation ~(]DNXB8I`  
 protected: kDa#yN\  
  //{{AFX_MSG(CAboutDlg) HKw:fGt/o^  
  //}}AFX_MSG cGp 6yf  
  DECLARE_MESSAGE_MAP() Q^w]Nj(e_  
}; S IK{GWX  
'+zsj0!A  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) P`9A?aG.Z  
{ k ,(:[3J  
 //{{AFX_DATA_INIT(CAboutDlg) <!>}t a  
 //}}AFX_DATA_INIT 8E%*o  
} (Fd4Gw<sq  
0^Cx`xdX:  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) NmF2E+'  
{ :+!b8[?Z  
 CDialog::DoDataExchange(pDX); 3U$fMLx]k  
 //{{AFX_DATA_MAP(CAboutDlg)  m:Abq`C  
 //}}AFX_DATA_MAP i=QhX CM  
} oU?X"B9  
CI'5JOqP  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) b7j#a#  
 //{{AFX_MSG_MAP(CAboutDlg) 5xUPqW%3  
 // No message handlers -h`0v  
 //}}AFX_MSG_MAP nCB3d[/B  
END_MESSAGE_MAP() )D*xOajo+l  
cEu98nP  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~A4WuA  
: CDialog(CCaptureDlg::IDD, pParent) 7S Zs/wWh%  
{ ?0Zw ^a  
 //{{AFX_DATA_INIT(CCaptureDlg) ^]gl#&"D  
  m_bControl = FALSE; tH(#nx8  
  m_bAlt = FALSE; rnE'gH(V'  
  m_bShift = FALSE; 1Tr=*b %f  
  m_Path = _T("c:\\"); L 3@wdC ~0  
  m_Number = _T("0 picture captured."); 3om-,gfZ  
  nCount=0; :tG5~sK  
  bRegistered=FALSE; g\'84:*J\  
  bTray=FALSE; pE,BE%  
 //}}AFX_DATA_INIT a@J :*W  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 WpZ^R;eK  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6suc:rp";  
} q'tT)IgD  
@("AkYPj  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $*R9LPpk+  
{ 8w' 8n  
 CDialog::DoDataExchange(pDX); g*M3;G  
 //{{AFX_DATA_MAP(CCaptureDlg) H1M>60*  
  DDX_Control(pDX, IDC_KEY, m_Key); b87o6"j  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); p?@D'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); `( Gk_VAa  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {r)M@@[  
  DDX_Text(pDX, IDC_PATH, m_Path); [f}1wZ*  
  DDX_Text(pDX, IDC_NUMBER, m_Number); m<4Lo0?nS  
 //}}AFX_DATA_MAP S\m]ze  
} /o2eKx  
\ PqV|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :e;fs.C  
//{{AFX_MSG_MAP(CCaptureDlg) IYPLitT  
 ON_WM_SYSCOMMAND() 4r*6fJ*bJ  
 ON_WM_PAINT() qxx.f5 8H  
 ON_WM_QUERYDRAGICON() , +^db)  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Jo0x/+?,+  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }1wuH  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .9ne'Ta  
//}}AFX_MSG_MAP iDsjIW\j  
END_MESSAGE_MAP() MNzq}(p  
\!3='~2:=o  
BOOL CCaptureDlg::OnInitDialog() +#no$m.bH  
{ zl5S)/A  
 CDialog::OnInitDialog(); g d-fJ._1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); mq L+W  
 ASSERT(IDM_ABOUTBOX < 0xF000); |Th{*IJ <,  
 CMenu* pSysMenu = GetSystemMenu(FALSE); uu>g(q?4II  
 if (pSysMenu != NULL) X)~-MY*p  
 { q,GL#L  
  CString strAboutMenu; .+<K-'&=  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?m6E@.{  
  if (!strAboutMenu.IsEmpty()) `t -3(>P  
  { K5$ y  
   pSysMenu->AppendMenu(MF_SEPARATOR); sAb|]Q((  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); JpDkf$kM  
  } ^RyrUb  
 } >7 |37a  
 SetIcon(m_hIcon, TRUE); // Set big icon fOJyY[  
 SetIcon(m_hIcon, FALSE); // Set small icon Q%a4g  
 m_Key.SetCurSel(0); ]:;gk&P  
 RegisterHotkey(); gS%J`X$  
 CMenu* pMenu=GetSystemMenu(FALSE); 9SPu 4i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ud](hp"  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); >nxtQ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ]q j%6tz  
 return TRUE; // return TRUE unless you set the focus to a control G4i&:0  
} 6T-(GHzfHJ  
z)26Ahm TV  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) D"MNlm  
{ 8P .! q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) pr2d}~q4{  
 { `{ /tx!  
  CAboutDlg dlgAbout; <1y%ch;  
  dlgAbout.DoModal(); ()r DM@  
 } *M="k 1P1  
 else 4&\m!s  
 { G*QQpSp  
  CDialog::OnSysCommand(nID, lParam); &~j"3G;e  
 } V{npK(  
} 9u9#&xx  
|89`O^   
void CCaptureDlg::OnPaint() 0zd1:*KR,  
{ ."R 2^`  
 if (IsIconic()) K= 69z  
 { Rk'Dd4"m ,  
  CPaintDC dc(this); // device context for painting ISl'g'o  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,Zdc  
  // Center icon in client rectangle  I{E10;  
  int cxIcon = GetSystemMetrics(SM_CXICON); kxKBI{L  
  int cyIcon = GetSystemMetrics(SM_CYICON); A >x{\  
  CRect rect; ;{>z\6N  
  GetClientRect(&rect); !u^(<.xJ   
  int x = (rect.Width() - cxIcon + 1) / 2; Q>.-u6(&  
  int y = (rect.Height() - cyIcon + 1) / 2; w,\Ua&>4  
  // Draw the icon Cc=`:ED+  
  dc.DrawIcon(x, y, m_hIcon); ]Z~H9!%t  
 } z_zr3XR9  
 else ^,?]]=mE  
 { Tj>~#~  
  CDialog::OnPaint(); /_LUys/0  
 } 0n1y$*I4  
} W nVX)o  
gSP|;Gy  
HCURSOR CCaptureDlg::OnQueryDragIcon() d=xweU<  
{ Q i?   
 return (HCURSOR) m_hIcon; n&@\[,B  
} )9Jt550(  
w7O(I"  
void CCaptureDlg::OnCancel() ><$hFrR!  
{ -tDmzuD6  
 if(bTray) ]e+S~me  
  DeleteIcon(); qgu.c`GmW  
  CDialog::OnCancel(); #MI}KmH  
} h8nJ$jg  
%GAEZH,2sG  
void CCaptureDlg::OnAbout() 1(C%/g#"  
{ pTcm2-J  
 CAboutDlg dlg; lqu1H&  
 dlg.DoModal(); w2Pkw'a{  
} ]F-{)j  
0e3 aWn  
void CCaptureDlg::OnBrowse() T#T!a0  
{ M,6m*  
 CString str; 3 bGpK9M~  
 BROWSEINFO bi; :eDwkzlHH  
 char name[MAX_PATH]; 2TY|)ltsF  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); g,9o'fs`x  
 bi.hwndOwner=GetSafeHwnd(); LR}b^QU7  
 bi.pszDisplayName=name; Uw4KdC  
 bi.lpszTitle="Select folder"; oc>,5 x  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Zs)HzOP)9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~^G k7  
 if(idl==NULL) 6f0 WN  
  return; OZ0q6"  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); /O+,vRw\A  
 str.ReleaseBuffer(); )mJl-u[0+  
 m_Path=str; YWjw`,EA(  
 if(str.GetAt(str.GetLength()-1)!='\\') W~FcU+a  
  m_Path+="\\"; <SOC  
 UpdateData(FALSE); IC37f[Q  
} z1_\P) M  
*tO7A$LDT  
void CCaptureDlg::SaveBmp() o|(-0mWBQA  
{ Il>!C\hU  
 CDC dc; Tw);`&Ulo  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); U C3?XoT\  
 CBitmap bm; {088j?[hzk  
 int Width=GetSystemMetrics(SM_CXSCREEN); zuwCN.  
 int Height=GetSystemMetrics(SM_CYSCREEN); C]p3,G,oN  
 bm.CreateCompatibleBitmap(&dc,Width,Height); SX$v&L<  
 CDC tdc; ) j_g*<  
 tdc.CreateCompatibleDC(&dc); s=#3f3  
 CBitmap*pOld=tdc.SelectObject(&bm); 9#xcp/O  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X~G!{TT_x6  
 tdc.SelectObject(pOld); vn9_tL&  
 BITMAP btm; }L3kpw  
 bm.GetBitmap(&btm); Z>{3t/`  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; DI"mi1ObE  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); inBBU[Sl  
 BITMAPINFOHEADER bih; -=_bXco}  
 bih.biBitCount=btm.bmBitsPixel; o|#Mq"od  
 bih.biClrImportant=0; j/"{tMqQp  
 bih.biClrUsed=0; GQ<]Sd}[  
 bih.biCompression=0; {B^V_TX2  
 bih.biHeight=btm.bmHeight; bH+x `]{A  
 bih.biPlanes=1; py#`  
 bih.biSize=sizeof(BITMAPINFOHEADER); Fl{:aq"3  
 bih.biSizeImage=size; <WXO].^  
 bih.biWidth=btm.bmWidth; f4.k%|]  
 bih.biXPelsPerMeter=0; }5n((7@X  
 bih.biYPelsPerMeter=0; gcImk0NIY  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); W#cr9"'Ta  
 static int filecount=0; x' Z<  
 CString name; ; n2|pC^  
 name.Format("pict%04d.bmp",filecount++); W":is"  
 name=m_Path+name; ejj|l   
 BITMAPFILEHEADER bfh; (]'Q!MjGa  
 bfh.bfReserved1=bfh.bfReserved2=0; KZ ezA4  
 bfh.bfType=((WORD)('M'<< 8)|'B'); >V~q`htth  
 bfh.bfSize=54+size; x}TDb0V  
 bfh.bfOffBits=54; AYHfe#!  
 CFile bf; B`Q.<Lqu  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ I\R5Cb<p  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ]2n&DJu  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); DM6oMT  
  bf.WriteHuge(lpData,size); Oq{&hH/'}  
  bf.Close(); TQ&%SMCn  
  nCount++; qB3{65  
 } ,x5`5mT3  
 GlobalFreePtr(lpData); &J|3uY,'j  
 if(nCount==1) R7us9qM4e  
  m_Number.Format("%d picture captured.",nCount); SdUtAC2  
 else /'1UfjW>  
  m_Number.Format("%d pictures captured.",nCount); w<_.T#  
  UpdateData(FALSE); #bPio  
} zypZ3g{vz  
sm}q&m]ad  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) W|=?-  
{ Tgp}k%R~  
 if(pMsg -> message == WM_KEYDOWN) Ygn"7  
 { Uq)|]a&e  
  if(pMsg -> wParam == VK_ESCAPE) M;W{A)0i1  
   return TRUE; !@-j!Ub  
  if(pMsg -> wParam == VK_RETURN) N s9cx  
   return TRUE; E66e4?"  
 } wP1dPl_j:0  
 return CDialog::PreTranslateMessage(pMsg); P*/px4;6  
} f(DGC2R <  
}M f}gCEW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) '9GHmtdO,  
{ HKP\`KBC j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j._9;HifZ  
  SaveBmp(); ~!]FF}6  
  return FALSE; 6KhHS@Z  
} sCaw"{5qc  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ N##T1 Qm)  
 CMenu pop; 8x'rNb  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1));  >0+m  
 CMenu*pMenu=pop.GetSubMenu(0); oypq3V=5  
 pMenu->SetDefaultItem(ID_EXITICON); .eXIbd<C  
 CPoint pt; FqsG#6|x  
 GetCursorPos(&pt); 5gI@~h S  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $$ {ebt  
 if(id==ID_EXITICON) jD_(im5  
  DeleteIcon(); H1|X0 a(j  
 else if(id==ID_EXIT) ?C.C?h6F5B  
  OnCancel(); 0"u*Kn  
 return FALSE; gU>Y  
} \UJ:PW$7  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); *~4uF  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Qo?"hgjlqm  
 AddIcon(); rf;R"Uc  
 return res; xQ1&j,R]  
} `;*=2M<c  
%Iv+Y$'3B  
void CCaptureDlg::AddIcon() L7n->8Qk  
{ 8<)[+ @$0  
 NOTIFYICONDATA data; Ca+d ?IS  
 data.cbSize=sizeof(NOTIFYICONDATA); QEUg=*3W=  
 CString tip; K"Nq_Ddwd  
 tip.LoadString(IDS_ICONTIP); }'kk}2ej`  
 data.hIcon=GetIcon(0); 8 gOK?>'9  
 data.hWnd=GetSafeHwnd(); jc;&g)Rv  
 strcpy(data.szTip,tip); !bH-(K{S6  
 data.uCallbackMessage=IDM_SHELL; 9jaYmY]~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ,PRM(n-  
 data.uID=98; ~<v`&Gm?"  
 Shell_NotifyIcon(NIM_ADD,&data); o1zc`Ibd  
 ShowWindow(SW_HIDE); K+T`'J4  
 bTray=TRUE; R(pvUm& L  
} ]}>GUXe)^  
4CX*  
void CCaptureDlg::DeleteIcon() {!^HG+  
{ .h~)|" uzW  
 NOTIFYICONDATA data; Z`b,0[rG[  
 data.cbSize=sizeof(NOTIFYICONDATA); @!%<JZEz3  
 data.hWnd=GetSafeHwnd(); 22tY%Y9  
 data.uID=98; \FVR'A1  
 Shell_NotifyIcon(NIM_DELETE,&data); Q:_pW<^  
 ShowWindow(SW_SHOW); k qwS/s  
 SetForegroundWindow(); !3yR?Xem}  
 ShowWindow(SW_SHOWNORMAL); ~Gwn||g78  
 bTray=FALSE; 4 D\_[(P  
}  PJk Mn  
T'Jw\u>"R  
void CCaptureDlg::OnChange() 1grrb&K  
{ '^Sa|WXq  
 RegisterHotkey(); "]MF =-v  
} xu+wi>Y^  
<YJU?G:@  
BOOL CCaptureDlg::RegisterHotkey() 5^* d4[&+  
{ : ] Y=  
 UpdateData(); k(VA5upCs  
 UCHAR mask=0; Fzu"&&>0$  
 UCHAR key=0; qx_+mCZ  
 if(m_bControl) /-BplU*"9  
  mask|=4; ;2dhue  
 if(m_bAlt) b GwLfU  
  mask|=2; NO* 1km[#  
 if(m_bShift) W4>8  
  mask|=1; f0wQn09  
  key=Key_Table[m_Key.GetCurSel()]; ,C=Fgxw(  
 if(bRegistered){ ]4z?sk@  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); H%faRUonz  
  bRegistered=FALSE; &lGp /m:  
 } (5G^"Srw  
 cMask=mask; |L`w4;  
 cKey=key; kv (N/G  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Q3oVl^q  
 return bRegistered; %X[|7D-  
} evszfCH'J  
W*U\79H  
  四、小结 =euoSH D}  
GhpH7% s  
  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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