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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: n-2]M0 5O  
  Pjf"CW+A  
  一、实现方法 oi7@s0@  
E:_ZA  
  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: n t;m+by  
3)wN))VBX  
#pragma data_seg("shareddata") b<[Or^X ]  
HHOOK hHook =NULL; //钩子句柄 f].h^ ~.q  
UINT nHookCount =0; //挂接的程序数目 PA{PD.4Du  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 dw>C@c#"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _ gR;=~S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey KJUH(]>F  
static int KeyCount =0; (*9$`!wS  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 C\3rJy(VJ  
#pragma data_seg() FW;?s+Uyx  
'T;P;:!\  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 _IHV7*u{;  
:1Xz4wkWS*  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: >0y'Rgfe  
;3coP{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR wYXQlxdy  
cKey,UCHAR cMask) :wyno#8`-  
{ Vi$~-6n&  
 BOOL bAdded=FALSE; i$"F{|Z0  
 for(int index=0;index<MAX_KEY;index++){ UBU=9a5  
  if(hCallWnd[index]==0){ tyDU @M  
   hCallWnd[index]=hWnd; h|9L5  
   HotKey[index]=cKey;  R Z?jJm$  
   HotKeyMask[index]=cMask; \[i1JG  
   bAdded=TRUE;  `,*3[  
   KeyCount++; CT <7mi!  
   break; 8}x:`vDK  
  } WF+99?75  
 } GT.,  
 return bAdded; np^N8$i:n  
} dm0R[[7  
//删除热键 yx8z4*]kH  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wo{gG?B  
{ `:fZ)$sY  
 BOOL bRemoved=FALSE;  :A_@,Q  
 for(int index=0;index<MAX_KEY;index++){ ,Ks8*;#r  
  if(hCallWnd[index]==hWnd){ WM$ MPs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l~q\3UKlt  
    hCallWnd[index]=NULL; Y=?3 js?O  
    HotKey[index]=0; ;u ({\K  
    HotKeyMask[index]=0; ,.8KN<A2]'  
    bRemoved=TRUE; vzAaxk%  
    KeyCount--; epe)a  
    break; CI0C1/:@  
   } 9wUkh}s  
  } <?.&^|kS  
 } rl;~pO5R9  
 return bRemoved; yjX9oxhtL  
} K&]G3W%V  
A2Ed0|By  
z (wc0I  
  DLL中的钩子函数如下: 3BJ0S.TF  
Xza(k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >Eto( y"q  
{ K#d`Hyx  
 BOOL bProcessed=FALSE; ;(Or`u]Dr  
 if(HC_ACTION==nCode) CNyIQ}NJ  
 { DU'`ewLL7  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 CAWNDl4  
   switch(wParam) e{K 215  
   {  ;7V%#-  
    case VK_MENU: 7t0=[i  
     MaskBits&=~ALTBIT; bl;1i@Z*M  
     break; Z]Cq3~l  
    case VK_CONTROL: I-*S&SiXjI  
     MaskBits&=~CTRLBIT; #&aqKV Y  
     break; 3z?> j]  
    case VK_SHIFT:  skViMo  
     MaskBits&=~SHIFTBIT; D2 eckLT  
     break; D?_Zl;bQ'^  
    default: //judge the key and send message }@+0/W?\.  
     break; YnAm{YyI  
   } lvz7#f L~  
   for(int index=0;index<MAX_KEY;index++){ azp):*f("  
    if(hCallWnd[index]==NULL) P l]O\vh  
     continue; 5c0 ZRV#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \ :sUL!  
    { @o _}g !9=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *vxk@ `K~  
     bProcessed=TRUE; mxC;?s;~  
    } b5vC'B-!  
   } 1~ 3_^3OT  
  }  }q`S$P;  
  else if((lParam&0xc000ffff)==1){ //有键按下 #OD/$f_  
   switch(wParam) ,m:.-iy?  
   { WPMSm<[  
    case VK_MENU: )9`qG:b'  
     MaskBits|=ALTBIT; KL57# gV  
     break; h(_57O:  
    case VK_CONTROL: ;:g@zAV  
     MaskBits|=CTRLBIT; 'Aq{UGN  
     break; 06Sceq  
    case VK_SHIFT: v%z=ysA  
     MaskBits|=SHIFTBIT; NP3y+s  
     break; [EXs  
    default: //judge the key and send message [D4SW#  
     break; "$^ ~!1~  
   } WlC:l  
   for(int index=0;index<MAX_KEY;index++){ k"iOB-@B+  
    if(hCallWnd[index]==NULL) ?mxMk6w  
     continue; 6iE<T&$3P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )yZ^[uJ}3C  
    { X *"i6 *  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ??vLUv  
     bProcessed=TRUE; &.Qrs :U  
    } {@{']Y  
   } Vaw+.sG`AP  
  } XJ| <?   
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7WS p($  
   for(int index=0;index<MAX_KEY;index++){ %RRNJf}z  
    if(hCallWnd[index]==NULL) G@X% +$I  
     continue; 051 E6-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "_NN3lD)X  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _9Te!gJ4_#  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ,i`,Oy(BI  
   } xr Jg\to{i  
  } @,my7?::oM  
 } u^I|T.w<r6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #gs`#6 ,'  
} 29] G^f>  
08\, <9  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: "&?kC2Y|  
^A&1^B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q{LF>Wi  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G}raA%  
}V`"s^  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: sBg.u  
%pL''R9VF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0znR0%~  
{ z,p~z*4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0pd'93C  
 { 3~ {:`[0Q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 p6Gy ,C.  
  SaveBmp(); H40p86@M  
  return FALSE; *P=VFP  
 } E4/Dr}4  
 …… //其它处理及默认处理 xOmi\VbM  
} mNTzUoZF'@  
;'@9[N9  
0=1T.4+=  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 m&,(Jla  
`d`T*_  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ^Y \"}D  
d^ 8ZeC#  
  二、编程步骤 N<VJ(20y  
!z3jTv  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Cnh \%OW  
X5$Iyis  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; xY(*.T9K  
6?J i7F  
  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; @K !T,U  
Aw.qK9I  
  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; &B1WtW  
bK&+5t&  
  5、 添加代码,编译运行程序。 g:8h|w)  
HQhM'x  
三、程序代码 \Uq(Zga4)  
Ai3*QX  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL I,vJbvvl!  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) lX4 x*  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "@0]G<H  
#if _MSC_VER > 1000 +iRh  
#pragma once ENs&RZ;  
#endif // _MSC_VER > 1000 JL{VD /f  
#ifndef __AFXWIN_H__ Lk}J8 V^2  
#error include 'stdafx.h' before including this file for PCH 7~.9=I'A  
#endif V {ddr:]4  
#include "resource.h" // main symbols u\;C;I-? '  
class CHookApp : public CWinApp YUy0!`!`  
{ 8'io$ 6d=  
 public: +VOK%8,p  
  CHookApp(); BUXpC xQ  
  // Overrides KB(8f*  
  // ClassWizard generated virtual function overrides M%P:n/j  
  //{{AFX_VIRTUAL(CHookApp) )1`0PJoHE  
 public: w_K1]<Q*  
  virtual BOOL InitInstance(); .p" xVfi6  
  virtual int ExitInstance(); $DaNbLV  
  //}}AFX_VIRTUAL r52gn(,  
  //{{AFX_MSG(CHookApp) 6mxfLlZ  
  // NOTE - the ClassWizard will add and remove member functions here. -X2Buz8  
  // DO NOT EDIT what you see in these blocks of generated code ! 9EibIOD^/  
  //}}AFX_MSG I:1C8*/  
  DECLARE_MESSAGE_MAP() U8n V[  
}; M-Y_ Wb3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); !wh8'X*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =MDys b&:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ],Do6 @M-  
BOOL InitHotkey(); P{ lB50  
BOOL UnInit(); sWnLEw  
#endif ;+ hH  
v;D~Pa  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. K`fuf=  
#include "stdafx.h" M&9+6e'-F  
#include "hook.h" 60?%<oJ oH  
#include <windowsx.h> T!)(Dv8@F  
#ifdef _DEBUG PIS2Ed]  
#define new DEBUG_NEW q(W3i^778  
#undef THIS_FILE FP4P|kl/9'  
static char THIS_FILE[] = __FILE__; 5D//*}b,  
#endif 7Kxp=-k  
#define MAX_KEY 100 lZKi'vg7  
#define CTRLBIT 0x04 Q K<"2p?  
#define ALTBIT 0x02 a~y'RyA  
#define SHIFTBIT 0x01 V/9!K%y  
#pragma data_seg("shareddata") pG;U2wE  
HHOOK hHook =NULL; DT&@^$?  
UINT nHookCount =0; 8P&:_T!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 5vnrA'BhBU  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT z1X`o  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey <*cikXS  
static int KeyCount =0; 5">Z'+8  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift D_zZXbNc  
#pragma data_seg() suDQ~\ n  
HINSTANCE hins; R.yvjPwJ  
void VerifyWindow(); V+9 MoT?8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) CB}2j  
//{{AFX_MSG_MAP(CHookApp) SSMHoJGm  
// NOTE - the ClassWizard will add and remove mapping macros here. J)p l|I  
// DO NOT EDIT what you see in these blocks of generated code! @_}P-h  
//}}AFX_MSG_MAP r$s Qf&=  
END_MESSAGE_MAP() LyFN.2qw  
V1B5w_^>h'  
CHookApp::CHookApp() 1tFNM[R  
{ HY:7? <r  
 // TODO: add construction code here, tf`^v6m%]  
 // Place all significant initialization in InitInstance ds[|   
} qF;|bF  
!%%6dB@%t  
CHookApp theApp; Se =`N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) *VxgARIL  
{ %6f*{G w  
 BOOL bProcessed=FALSE; /aZ`[m2  
 if(HC_ACTION==nCode) z*% q@]ym  
 { smo~7;  
  if((lParam&0xc0000000)==0xc0000000){// Key up B \2 SH%\  
   switch(wParam) 'E""amIJ  
   { oe-\ozJ0  
    case VK_MENU: L) T (<  
     MaskBits&=~ALTBIT; 4 "'~NvO  
     break; 9InVQCf2J  
    case VK_CONTROL: 4^|3TntO  
     MaskBits&=~CTRLBIT; svH !1 b  
     break; q^<?]8  
    case VK_SHIFT: II{&{S'HU  
     MaskBits&=~SHIFTBIT; Qd3 j%(  
     break; Wg]Qlw`\|  
    default: //judge the key and send message 9CD_ os\h  
     break; H$UcF1k<  
   } ~2-1 j  
   for(int index=0;index<MAX_KEY;index++){ *VT/  
    if(hCallWnd[index]==NULL) 1/J=uH  
     continue; 9~[Y-cpoi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kMN~Y  
    { k\?Ii<m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &0JI!bR(  
     bProcessed=TRUE; k@W1-D?  
    } Lt>IX")  
   } O6^]=/wd  
  } P@c5pc#|  
  else if((lParam&0xc000ffff)==1){ //Key down r mg}N  
   switch(wParam) 7J<5f)  
   { c9h6C  
    case VK_MENU: Wvf ^N(  
     MaskBits|=ALTBIT; C1QA)E['V  
     break; 0flRh)[J  
    case VK_CONTROL: z-)O9PV  
     MaskBits|=CTRLBIT; 1yu4emye4  
     break; 7hPY_W y  
    case VK_SHIFT: 20Wg=p9L  
     MaskBits|=SHIFTBIT; ?.BC#S)q1  
     break; qY!Zt_Be6  
    default: //judge the key and send message G" "ZI$`  
     break; U-M>=3|N  
   } -nV9:opD  
   for(int index=0;index<MAX_KEY;index++) pFjK}J OF  
   { *J`O"a  
    if(hCallWnd[index]==NULL) /9fR'EO{x  
     continue; O :Tj"@h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Xc&9Glf  
    { Qzw;i8n{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); qlPT Ll  
     bProcessed=TRUE; Z(CkZll  
    } nAdf=D'P  
   } IjnU?Bf  
  } I-l_TpM)  
  if(!bProcessed){ &Au@S$ij  
   for(int index=0;index<MAX_KEY;index++){ `VguQl_,gA  
    if(hCallWnd[index]==NULL) IW] rb/H  
     continue; a9V,es"BWQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pTLCWbF?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6.yu-xm  
   } x7 ,5  
  } |P?*5xPB  
 } nAlQ7 '  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %d9uTm;  
} KoT%Mfu  
b@hqz!)l`  
BOOL InitHotkey() .HABNPNg(  
{ c@L< Z`u  
 if(hHook!=NULL){ [ub e6  
  nHookCount++; DkDmE  
  return TRUE; ,r_Gf5c  
 } I{=Qtnlb  
 else  o-B$J?  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); H3-hcx54T  
  if(hHook!=NULL) mj7#&r,1l  
   nHookCount++; 19%i mf  
  return (hHook!=NULL); c'\dFb9a  
} M/`lM$98:  
BOOL UnInit() #&e-|81H  
{ vKAN@HSYr  
 if(nHookCount>1){ IO<6  
  nHookCount--; M x" \5i  
  return TRUE; ) Hr`M B  
 } ^E>3|du]O  
 BOOL unhooked = UnhookWindowsHookEx(hHook); aV0"~5  
 if(unhooked==TRUE){ +G>\-tjSD  
  nHookCount=0; s_p!43\J  
  hHook=NULL; WcbiqxK7-  
 } &m;*<}X  
 return unhooked; o}p n0KO,  
} V0a3<6@4  
9_h[bBx-'Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +R75v)  
{ o.`5D%}i  
 BOOL bAdded=FALSE; }"%N4(Kd  
 for(int index=0;index<MAX_KEY;index++){ _Y m2/3!  
  if(hCallWnd[index]==0){ |CbikE}kL  
   hCallWnd[index]=hWnd; X1_5KH  
   HotKey[index]=cKey; \cM2k-  
   HotKeyMask[index]=cMask; k4zZ7H  
   bAdded=TRUE; VuZr:-K/  
   KeyCount++; ,|/f`Pl  
   break; yEy6]f+>+  
  } Q22 GIr  
 } +&H4m=D-#a  
 return bAdded; E' uZA  
} ;}p  
kD"{g#c  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t sRdvFFq  
{ A^SgI-y|  
 BOOL bRemoved=FALSE; <IW$m!{VG  
 for(int index=0;index<MAX_KEY;index++){ |u p  
  if(hCallWnd[index]==hWnd){ ?+8\.a!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ uCB=u[]y4  
    hCallWnd[index]=NULL; |k00Z+O(  
    HotKey[index]=0; z\4.Gm-  
    HotKeyMask[index]=0; ;q>ah!"k  
    bRemoved=TRUE; o^wqFX(Y  
    KeyCount--; tfWS)y7  
    break; %\:Wi#w>  
   } .x&%HA  
  } ML p9y#  
 } `">=  
 return bRemoved; V0Hj8}l;M  
} %B?=q@!QWn  
X"*5+* z]  
void VerifyWindow() RPbZ(.  
{ +aAc9'k   
 for(int i=0;i<MAX_KEY;i++){ 0<*<$U  
  if(hCallWnd!=NULL){ xD=csJ'(  
   if(!IsWindow(hCallWnd)){ ?Z}&EH  
    hCallWnd=NULL; EKN~H$.  
    HotKey=0; \z)%$#I  
    HotKeyMask=0; B`sAk %  
    KeyCount--; 'Z]w^<  
   } b#o|6HkW  
  } ]/{)bpu  
 } q1ma%eiN  
} PZzMHK?hP  
b\5F]r  
BOOL CHookApp::InitInstance() !bP@n  
{ {K!)Ss  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); TkF[x%o  
 hins=AfxGetInstanceHandle(); bW:!5"_{H  
 InitHotkey(); IAyp2  
 return CWinApp::InitInstance(); >@Kx>cg+  
} 5 IpDeJ$  
?&uu[y  
int CHookApp::ExitInstance() /zox$p$?h  
{ ` G kX  
 VerifyWindow(); {2gwk8  
 UnInit(); ,/U6[P_C5  
 return CWinApp::ExitInstance(); dD@(z: 5M\  
} J9 I:Q<;  
*=xr-!MEk  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file  _','9|  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) c1gQ cqF  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ hCo|HB  
#if _MSC_VER > 1000 FC4wwzb  
#pragma once f,Ghb~y  
#endif // _MSC_VER > 1000 !TcJ)0   
&,)&%Sg[  
class CCaptureDlg : public CDialog A/?7w   
{ c4zR*  
 // Construction 3r1*m  +  
 public: ,tRj4mx  
  BOOL bTray; fd9k?,zM  
  BOOL bRegistered; $NO&YLS@  
  BOOL RegisterHotkey(); [KQ6Ta.  
  UCHAR cKey; rW#T vUn  
  UCHAR cMask; lr$zHI7_`  
  void DeleteIcon(); N)Z?Z+ }h  
  void AddIcon(); L4l!96]a  
  UINT nCount; #|``ca54B  
  void SaveBmp(); /wlEe>i  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor B|X!>Q<g  
  // Dialog Data -%4,@ x`  
  //{{AFX_DATA(CCaptureDlg) {7pli{`  
  enum { IDD = IDD_CAPTURE_DIALOG }; D3K8F@d  
  CComboBox m_Key; 3 8`<:{^Y  
  BOOL m_bControl; W!(LF7_!  
  BOOL m_bAlt; "^iYLQOC  
  BOOL m_bShift; %N_%JK\{@  
  CString m_Path; {fp[BF  
  CString m_Number; uvS)8-o&F  
  //}}AFX_DATA E<*xx#p  
  // ClassWizard generated virtual function overrides C9 j|OSgk  
  //{{AFX_VIRTUAL(CCaptureDlg) YA5g';$H*  
 public: [a<SDMR  
  virtual BOOL PreTranslateMessage(MSG* pMsg); _Bj":rzY  
 protected: ijU*|8n{>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ??/ 'kmd  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); L{Vqh0QD&  
  //}}AFX_VIRTUAL -35;j'a  
  // Implementation SZCze"`[  
 protected: K"@M,8hb  
  HICON m_hIcon; Uoix  
  // Generated message map functions 28u_!f[  
  //{{AFX_MSG(CCaptureDlg) h zn6kbv  
  virtual BOOL OnInitDialog(); Ssg&QI  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); YZJyk:H\  
  afx_msg void OnPaint(); 9-m=*|p  
  afx_msg HCURSOR OnQueryDragIcon(); Qe(:|q _  
  virtual void OnCancel(); ku M$UYTTX  
  afx_msg void OnAbout(); 0Wp|1)ljA  
  afx_msg void OnBrowse(); mRK>U$v  
  afx_msg void OnChange(); @9|hMo  
 //}}AFX_MSG ] @fk] ]R  
 DECLARE_MESSAGE_MAP() |(^PS8wG  
}; f6"Z'{j  
#endif IO:G1;[/2L  
*}W_+qo"  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file bi;1s'Y<D  
#include "stdafx.h" g< .qUBPKX  
#include "Capture.h" 13/]DF,S"^  
#include "CaptureDlg.h"  "-V"=t'  
#include <windowsx.h> ?!/kZM_ts  
#pragma comment(lib,"hook.lib") %vi83%$'4  
#ifdef _DEBUG eh#(eua0/  
#define new DEBUG_NEW vs{s_T7Mz]  
#undef THIS_FILE R0-j5&^jju  
static char THIS_FILE[] = __FILE__; lU8Hd|@-  
#endif b5n'=doR/I  
#define IDM_SHELL WM_USER+1 lsNd_7k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iO; 7t@]-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,~W|]/b<q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; x'R`. !g3  
class CAboutDlg : public CDialog Od)C&N=y  
{ 9( wK@  
 public: D^;Uq8NDKq  
  CAboutDlg(); @"H >niG  
  // Dialog Data "" ZQ/t\  
  //{{AFX_DATA(CAboutDlg) Aq7osU1B  
  enum { IDD = IDD_ABOUTBOX }; @7n"yp*"  
  //}}AFX_DATA 0_t!T'jr7  
  // ClassWizard generated virtual function overrides b>JDH1)  
  //{{AFX_VIRTUAL(CAboutDlg) S ByW[JE  
 protected: XU7qd:|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;,e2egC'  
  //}}AFX_VIRTUAL K@hw.Xq"  
  // Implementation u\JNr}bL  
 protected: Nda *L|  
  //{{AFX_MSG(CAboutDlg) _zMW=nypdx  
  //}}AFX_MSG z2>lI9D4V  
  DECLARE_MESSAGE_MAP() iOO)Q\  
}; hY8reQp1  
9'q*:&qq  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) <Q?F?.^e  
{ UFuX@Lu0  
 //{{AFX_DATA_INIT(CAboutDlg) 65^9  
 //}}AFX_DATA_INIT _:27]K:  
} x-3\Ls[I  
lnR{jtWP  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #Mw8^FST  
{ #>+HlT  
 CDialog::DoDataExchange(pDX); Y:a]00&)#Y  
 //{{AFX_DATA_MAP(CAboutDlg) H7:] ]j1  
 //}}AFX_DATA_MAP ]OzUGXxo~  
} ]z9=}=If  
HyWCMK6b  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?6Y?a2 |  
 //{{AFX_MSG_MAP(CAboutDlg) D}/vLw:v  
 // No message handlers a:6m7U)P#5  
 //}}AFX_MSG_MAP Tnm.A?  
END_MESSAGE_MAP() M =r)I~  
5XB H$&Td  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) TRq6NB  
: CDialog(CCaptureDlg::IDD, pParent) yz8jw:d^-  
{ ')3 bl3:  
 //{{AFX_DATA_INIT(CCaptureDlg) gB'6`'  
  m_bControl = FALSE; Q'0d~6n&{  
  m_bAlt = FALSE; G'A R`"F  
  m_bShift = FALSE; sON|w86B  
  m_Path = _T("c:\\"); b SU~XGPB  
  m_Number = _T("0 picture captured."); =C.$ UX  
  nCount=0; 7Jho}5J  
  bRegistered=FALSE; ~Jz6O U*z  
  bTray=FALSE; [hj6N*4y  
 //}}AFX_DATA_INIT S^\Vgi(  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /t"3!Z?BOv  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); E~oOKQ5W  
} pIX`MlBdF  
?(i{y~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )Z9>$V$j  
{ ,01"SWE  
 CDialog::DoDataExchange(pDX); ?.;c$'  
 //{{AFX_DATA_MAP(CCaptureDlg) e**qF=HCw  
  DDX_Control(pDX, IDC_KEY, m_Key); [HZv8HU|  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 6,{$J  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ZzT9j~  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Y/zj[>  
  DDX_Text(pDX, IDC_PATH, m_Path); QMbOuw  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (JFWna0@  
 //}}AFX_DATA_MAP t{vJM!kdlQ  
} :Fvrs( x  
B_m8{44zM  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) OpYY{f  
//{{AFX_MSG_MAP(CCaptureDlg) I9hK} D  
 ON_WM_SYSCOMMAND() |8tilOqI  
 ON_WM_PAINT() `RL"AH:+  
 ON_WM_QUERYDRAGICON() j#q-^h3H  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .ctw2x5W  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) [3|P7?W/  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 03#lX(MB  
//}}AFX_MSG_MAP ut7zVp<"  
END_MESSAGE_MAP() [K0(RDV)%  
K(,F~ .<  
BOOL CCaptureDlg::OnInitDialog() [E juUElr  
{ I4i>+:_J  
 CDialog::OnInitDialog(); HCC#j9UN6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @r/n F5  
 ASSERT(IDM_ABOUTBOX < 0xF000); wcY? rE9  
 CMenu* pSysMenu = GetSystemMenu(FALSE); #'9HU2  
 if (pSysMenu != NULL) @i IRmQ  
 { _>X+ZlpU:  
  CString strAboutMenu; (0_2sfS  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Y glmX"fLf  
  if (!strAboutMenu.IsEmpty()) <B6H. P =  
  { dVT$VQg  
   pSysMenu->AppendMenu(MF_SEPARATOR); @QPz #-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); M:B=\&.O  
  } 338k?nHxv  
 } n8ZZ#}Nhg  
 SetIcon(m_hIcon, TRUE); // Set big icon q'Tf,a  
 SetIcon(m_hIcon, FALSE); // Set small icon %aVq+kC h  
 m_Key.SetCurSel(0); x-&@wMqkc  
 RegisterHotkey(); 'kO!^6=4M  
 CMenu* pMenu=GetSystemMenu(FALSE); lp%pbx43s  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); CN8Y\<Ar  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *mvlb (' &  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); t=W}SH  
 return TRUE; // return TRUE unless you set the focus to a control mSl.mi(JiZ  
} Trz@~d/[,n  
|imM# wF  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) hy"\RW  
{ 0[?Xxk}s0  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ?QdWrE_  
 { aQ\$A`?  
  CAboutDlg dlgAbout; 57  
  dlgAbout.DoModal(); K:# I  
 } a'yK~;+_9  
 else ML56k~"BL  
 { dk4CpN  
  CDialog::OnSysCommand(nID, lParam); x\G'kEd  
 } h^(* Tv-!  
} dn$!&  
z/2//mM  
void CCaptureDlg::OnPaint() A0 C,tVd  
{ 3eAX.z`D  
 if (IsIconic()) }Sh?S]]`  
 { mLLDE;7|}  
  CPaintDC dc(this); // device context for painting ]:k/Y$O2  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); C 7ScS"~  
  // Center icon in client rectangle 84zSK)=Y  
  int cxIcon = GetSystemMetrics(SM_CXICON); B !L{  
  int cyIcon = GetSystemMetrics(SM_CYICON); rlSeu5X6  
  CRect rect;  < !C)x  
  GetClientRect(&rect); ['tY4$L(  
  int x = (rect.Width() - cxIcon + 1) / 2; SP_75BJ  
  int y = (rect.Height() - cyIcon + 1) / 2; 6H WE~`ok6  
  // Draw the icon `% "\@<  
  dc.DrawIcon(x, y, m_hIcon); #r~# I}U  
 } ( 2E\p  
 else '/p/8V.O.  
 { .:%0E`E  
  CDialog::OnPaint(); Zaf:fsj>  
 } jZkcBIK2  
} a P@N)"  
[uN? ~lp\%  
HCURSOR CCaptureDlg::OnQueryDragIcon() 2E)-M9ds  
{ ,Np0wg0  
 return (HCURSOR) m_hIcon; k|PN0&J  
} M; tqp8  
:vQrOn18p  
void CCaptureDlg::OnCancel() :zke %Yx  
{ \aUC(K~o\;  
 if(bTray) V1 `o%;j  
  DeleteIcon(); RmeD$>7  
  CDialog::OnCancel(); SBk4_J/_  
} k:#!zK}  
[ =9T*Sp  
void CCaptureDlg::OnAbout() ep)n_!$OH"  
{ Em !/a$  
 CAboutDlg dlg; U- (01-  
 dlg.DoModal(); =M [bnq*\  
} lc1(t:"[  
qUW! G&R  
void CCaptureDlg::OnBrowse() ;LPfXpR  
{ G3vxjD<DMW  
 CString str; &P}_bx  
 BROWSEINFO bi; UapC"XYJ  
 char name[MAX_PATH]; aU "8{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); li'YDtMKCY  
 bi.hwndOwner=GetSafeHwnd();  JWhdMU  
 bi.pszDisplayName=name; RVA (Q[ ;  
 bi.lpszTitle="Select folder"; Val|n*%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :W.(S6O(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); p\tm:QWD;  
 if(idl==NULL) kY|utoAP  
  return; H.|#c^I  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (Ag1 6  
 str.ReleaseBuffer(); FF(#]vz'  
 m_Path=str; `O!X((  
 if(str.GetAt(str.GetLength()-1)!='\\') /h H  
  m_Path+="\\"; lH x^D;m6  
 UpdateData(FALSE); Kp~VS<3  
} SpLzm A  
rv^@,8vq  
void CCaptureDlg::SaveBmp() n&;85IF1  
{ TA`1U;c{n  
 CDC dc; =_ ./~  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); (ybI\UI  
 CBitmap bm; WwBOM~/`2  
 int Width=GetSystemMetrics(SM_CXSCREEN); ;!mzyb*  
 int Height=GetSystemMetrics(SM_CYSCREEN); L:pYn_  
 bm.CreateCompatibleBitmap(&dc,Width,Height); r?lf($ D*  
 CDC tdc; "fCu=@i  
 tdc.CreateCompatibleDC(&dc); p;59?  
 CBitmap*pOld=tdc.SelectObject(&bm); gx8ouOh  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); k"T}2 7  
 tdc.SelectObject(pOld); $m%f wB  
 BITMAP btm; mAj?>;R2$2  
 bm.GetBitmap(&btm); , j2Udn}  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; V6&!9b  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Yz/md1T$  
 BITMAPINFOHEADER bih; jrlVvzZ  
 bih.biBitCount=btm.bmBitsPixel; ~Ei$nV  
 bih.biClrImportant=0; RK'\C\gMDu  
 bih.biClrUsed=0; GmeQ`;9,  
 bih.biCompression=0; n.`($yR_  
 bih.biHeight=btm.bmHeight; h-#6av :  
 bih.biPlanes=1; nwB_8mN|  
 bih.biSize=sizeof(BITMAPINFOHEADER); QT< }] 0  
 bih.biSizeImage=size; 1R{!]uh  
 bih.biWidth=btm.bmWidth; Q_Q''j(r6b  
 bih.biXPelsPerMeter=0; ['X]R:3h  
 bih.biYPelsPerMeter=0; F3v !AvA|  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); x=hiQ>BIO0  
 static int filecount=0; Qcq`libK  
 CString name; nJG U-Z  
 name.Format("pict%04d.bmp",filecount++); b8`)y<7  
 name=m_Path+name; HZzDVCU  
 BITMAPFILEHEADER bfh; G_3O]BMKd)  
 bfh.bfReserved1=bfh.bfReserved2=0; iZ3IdiZ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /7nb,!~~l  
 bfh.bfSize=54+size; G~^r)fm_  
 bfh.bfOffBits=54; fo*2:?K&  
 CFile bf; H1pO!>M  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /yDz/>ID\  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); cz#rb*b  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5,Jp[bw{H{  
  bf.WriteHuge(lpData,size); c)TPM/>(p  
  bf.Close(); *v jmy/3  
  nCount++; 2\A$6N ;_  
 } Ja7R2-0ii#  
 GlobalFreePtr(lpData); dh`K`b4I  
 if(nCount==1) |"X*@s\'  
  m_Number.Format("%d picture captured.",nCount); xaq-.IQAM$  
 else t9kzw*U9  
  m_Number.Format("%d pictures captured.",nCount); ';w#w<yaI  
  UpdateData(FALSE); b,l$1{  
} 0U(@= 7V  
{3>$[bT  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Ga-k  
{ :j9l"5"  
 if(pMsg -> message == WM_KEYDOWN) <Dl*l{zba  
 { VuhGx:Xl  
  if(pMsg -> wParam == VK_ESCAPE) #l\=}#\1Wb  
   return TRUE; U2tV4_ e  
  if(pMsg -> wParam == VK_RETURN) j\[dx^\=  
   return TRUE; )0.kv2o.  
 } }>pknc?  
 return CDialog::PreTranslateMessage(pMsg); 8O5s`qKMYT  
} ]}<}lI9  
fIx+IL s  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4x=v?g&  
{ zsEc(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 9|^2",V  
  SaveBmp(); BM%e0n7  
  return FALSE; APn|\  
} m)ky*"(  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ . oF &Ff/[  
 CMenu pop; |sJ[0z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #px+;k 5  
 CMenu*pMenu=pop.GetSubMenu(0); VZp5)-!\  
 pMenu->SetDefaultItem(ID_EXITICON); !_]Y~[  
 CPoint pt; d\&U*=  
 GetCursorPos(&pt); /kZebNf6H  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Dzpq_F!;V  
 if(id==ID_EXITICON) z\\[S@>pt  
  DeleteIcon(); gD-d29pQ  
 else if(id==ID_EXIT) .9/ hHCp  
  OnCancel(); ;V:i!u u  
 return FALSE; &&5aM  
} )!th7sH  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); WrnrFz  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) g+8OekzB5  
 AddIcon(); du $:jN\}  
 return res; "(3[+W{|  
} Q,,e+exbb5  
I13y6= d  
void CCaptureDlg::AddIcon() bQzZy5,  
{ xeg/A}yE  
 NOTIFYICONDATA data; )nC]5MXU  
 data.cbSize=sizeof(NOTIFYICONDATA); @+&LYy72  
 CString tip; x 77*c._3v  
 tip.LoadString(IDS_ICONTIP); WA<v9#m  
 data.hIcon=GetIcon(0); \#8D>i?m  
 data.hWnd=GetSafeHwnd(); AVsDt2A  
 strcpy(data.szTip,tip); euK5pA>L  
 data.uCallbackMessage=IDM_SHELL; s$zLiQF;  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; lF<]8m%F  
 data.uID=98; ]{;gw<T  
 Shell_NotifyIcon(NIM_ADD,&data); KaLzg5is  
 ShowWindow(SW_HIDE); 6B8VfQ9[  
 bTray=TRUE; z 4e7PW|  
} =Pyj%4Rs  
prUN)r@U   
void CCaptureDlg::DeleteIcon() P7[h-3+^  
{ lB8-Z ow  
 NOTIFYICONDATA data; lne|5{h  
 data.cbSize=sizeof(NOTIFYICONDATA); BwN0!lsF3  
 data.hWnd=GetSafeHwnd(); E'f{i:O "~  
 data.uID=98; juP7P[d$qW  
 Shell_NotifyIcon(NIM_DELETE,&data); \ ,'m</o~,  
 ShowWindow(SW_SHOW); : p1u(hflS  
 SetForegroundWindow(); 7zl5yK N  
 ShowWindow(SW_SHOWNORMAL); ] 7[ 3>IN  
 bTray=FALSE; v8wq,CYV  
} vRYQ{:  
mtpeRVcF  
void CCaptureDlg::OnChange() .97])E[U  
{ <jBF[v9*m(  
 RegisterHotkey(); +i6GHBn~J  
} xBj 9y u  
1>.Ev,X+e  
BOOL CCaptureDlg::RegisterHotkey() \:P>le'1  
{ ?=u\n;w)  
 UpdateData(); ob!P ;]T  
 UCHAR mask=0; _f7 9wx\B  
 UCHAR key=0; mn'A9er  
 if(m_bControl) c rQ8q;:  
  mask|=4; h! ,v/7=  
 if(m_bAlt) ;gD})@  
  mask|=2; ]HbY  
 if(m_bShift) av(6wht8  
  mask|=1; 3RUy, s  
  key=Key_Table[m_Key.GetCurSel()];  > ^O7  
 if(bRegistered){ \Zb;'eDv  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ImA @}:  
  bRegistered=FALSE; x o;QCOH  
 } ; t)3F  
 cMask=mask; qfX6TV5J}!  
 cKey=key; 44J]I\+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ynp8r f  
 return bRegistered; `T1  
} ~ \r*  
HGl|-nW>  
  四、小结 TbMW|0 #w  
\a<wKTkn  
  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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