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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: KD'}9{F,  
  _ + >V(,{G  
  一、实现方法  xC2y/ ?  
-90X^]  
  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: K\5/||gi  
kuv+TN  
#pragma data_seg("shareddata") }jYVB|2  
HHOOK hHook =NULL; //钩子句柄 kM3#[#6$!  
UINT nHookCount =0; //挂接的程序数目 >vNE3S_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Tlk!6A:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 HyIyrUrYW  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey [\=1|t5n~  
static int KeyCount =0; e)|5 P  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 PsN_c[+  
#pragma data_seg() "1hFx=W+\  
aQ0pYk~(  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 n^/)T3mz{  
Y\E7nll:.  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: j_SUR)5  
v R ! y#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR a!, X@5  
cKey,UCHAR cMask) <,Jx3y q  
{ ;t4YI7E*  
 BOOL bAdded=FALSE; )%HIC@MM6  
 for(int index=0;index<MAX_KEY;index++){ eCG{KCM~_Z  
  if(hCallWnd[index]==0){ p+${_w>pl{  
   hCallWnd[index]=hWnd; fRp(&%8E  
   HotKey[index]=cKey; A&X XL~yH  
   HotKeyMask[index]=cMask; ]aYuBoj  
   bAdded=TRUE; FDuIm,NI  
   KeyCount++; W4)bEWO+q  
   break; )g`~,3G  
  }  J {$c|  
 } d1 lxz?r  
 return bAdded; >C`#4e?}  
} i_av_I-  
//删除热键 C4gzg  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  Au*1-  
{ T5wVJgN>  
 BOOL bRemoved=FALSE; r"dR}S.Uf  
 for(int index=0;index<MAX_KEY;index++){ ;&MnPFmq  
  if(hCallWnd[index]==hWnd){ C{,Vk/D-0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ A| y U'k  
    hCallWnd[index]=NULL; ts r{-4V  
    HotKey[index]=0; {HjJ9ZGQ  
    HotKeyMask[index]=0; xsU3c0wbr8  
    bRemoved=TRUE; p:3w8#)MZ  
    KeyCount--; R0-Y2v  
    break; 2%) ~E50U  
   } *pyC<4W  
  } JY3!jtv  
 } gZ=$bR  
 return bRemoved; QRwOv  
} 8tzL.P^  
2m9qg-W  
D[{"]=-  
  DLL中的钩子函数如下: "e/"$z'ca  
!(y(6u#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )M8@|~~  
{ y(=0  
 BOOL bProcessed=FALSE; %1)JRc  
 if(HC_ACTION==nCode) \\35} 9  
 { ed#>q;jX  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Y]i:$X]C?X  
   switch(wParam) OXZx!h  
   {  EF;B)y=  
    case VK_MENU: ?F~0\T,7  
     MaskBits&=~ALTBIT; {ea*dX872:  
     break; ^Zlbs goZ  
    case VK_CONTROL: ,<[x9 "3\  
     MaskBits&=~CTRLBIT; 2FGCf} ,  
     break; #r]GnC,  
    case VK_SHIFT: D3y4e8+Z'  
     MaskBits&=~SHIFTBIT; 6mjD@  
     break; SRrp= >w?  
    default: //judge the key and send message etk|%%J  
     break; c$_}   
   } _,w*Rv5=  
   for(int index=0;index<MAX_KEY;index++){ {fMo#`9=  
    if(hCallWnd[index]==NULL) biVsbxYurq  
     continue; Vc+~yh.)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1"T&B0G3l  
    { xFyBF[c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =UxKa`  
     bProcessed=TRUE; Kc+9n%sp  
    } ~L.5;8a3Pe  
   } $=Tq<W*c  
  } ][~rk?YY  
  else if((lParam&0xc000ffff)==1){ //有键按下 RI BB*  
   switch(wParam) P5'VLnE R{  
   { s+v$sF  
    case VK_MENU: '(8} <(%  
     MaskBits|=ALTBIT; pWKI^S  
     break; w# ;t$qz}  
    case VK_CONTROL: K:Z|# i-  
     MaskBits|=CTRLBIT; ^;@!\Rc  
     break; }mS+%w"j  
    case VK_SHIFT: KCn#*[  
     MaskBits|=SHIFTBIT; (dym*_J  
     break; &CfzhIi*!  
    default: //judge the key and send message H)K.2Q  
     break; 1c`Yn:H^  
   } w^S]HzMd  
   for(int index=0;index<MAX_KEY;index++){ r6 kQMFA  
    if(hCallWnd[index]==NULL) Dj w#{WR  
     continue; Y7`Dx'x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u<HJFGLzI  
    { RG- ,<G`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x^ sTGd  
     bProcessed=TRUE; dz?Ey~;M  
    } wT:mfS09N  
   } &>XSQB(&%  
  } 5NMju!/  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 S|_lb MZM  
   for(int index=0;index<MAX_KEY;index++){ [V;Q#r&+  
    if(hCallWnd[index]==NULL) pwV{@h!  
     continue; J#G\7'?{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3 FLht L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8 HdjZ!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 fJn4'Q*U  
   } m_UzmWF  
  } iRL|u~bj  
 } u2l`% F`x  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %UCuI9  
} 0f,Ii_k bT  
UujKgL4  
  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: </qli-fXB}  
ra{HlB{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); TzsNhrU{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); o]0\Km  
RZI4N4o  
  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: >\ PNKpn{  
AO0aOX8_+D  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .T7S1C $HP  
{ 4+a u6ABy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) FdmoR;  
 { $:*/^)L  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 )}T0SGY  
  SaveBmp(); Ndqhc  
  return FALSE; qF4pTQf  
 } @4j!M1} 4  
 …… //其它处理及默认处理 |?<r  
} %2rUJaOgy$  
qISzn04  
\oAxmvt  
  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\Qo9Il  
@m ?&7{y#?  
  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。 qvN 5[rb  
PD@@4@^  
  二、编程步骤 yI}_ U  
ScTeh  
  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"; l|~SVk|  
~er4w+"  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 6R%N jEW:  
MNsgD3  
  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; YDo,9  
\d"M&-O  
  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; ? Glkhf7(  
?h4Rh0rkX  
  5、 添加代码,编译运行程序。 A#P]|i  
EZvf\s>LT  
三、程序代码 8~")9w  
Lw!Q*3c  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL zgh~P^Z  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) O A9G] 8k  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #fR~ 7 KR  
#if _MSC_VER > 1000 ayvHS&h  
#pragma once ?H2{R:  
#endif // _MSC_VER > 1000 BCtm05  
#ifndef __AFXWIN_H__ 9 L^:N)-  
#error include 'stdafx.h' before including this file for PCH P,@ :?6  
#endif %[9d1F 3  
#include "resource.h" // main symbols Z-D4~?Tv  
class CHookApp : public CWinApp &:" [hU  
{ *?GV(/Q  
 public: M(_1'2  
  CHookApp(); oI6l`K$  
  // Overrides xJ(4RaP  
  // ClassWizard generated virtual function overrides bq<DW/  
  //{{AFX_VIRTUAL(CHookApp) |tkhsQ-;  
 public: >(aGk{e1  
  virtual BOOL InitInstance(); dLs40 -R  
  virtual int ExitInstance(); $stBB  
  //}}AFX_VIRTUAL UFox v)  
  //{{AFX_MSG(CHookApp) 9(PQ7}  
  // NOTE - the ClassWizard will add and remove member functions here. U[Pll~m2b  
  // DO NOT EDIT what you see in these blocks of generated code ! .jfkOt?2  
  //}}AFX_MSG # ~SQujgB  
  DECLARE_MESSAGE_MAP() mar BVFz~  
}; ZKv^q%92  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); _m+64qG_8'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7Q>*]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oq<n5  
BOOL InitHotkey(); *Q@%< R  
BOOL UnInit(); Q[+o\{ O  
#endif +s}"&IV%  
nzdJ*C  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. q~^qf  
#include "stdafx.h" 2^}E!(<  
#include "hook.h" F .(zS(q  
#include <windowsx.h> F|3 =Cl  
#ifdef _DEBUG Myj 68_wf  
#define new DEBUG_NEW pD+_ K  
#undef THIS_FILE Ig hd,G-  
static char THIS_FILE[] = __FILE__; ="$9 <wt  
#endif Q)7iu  
#define MAX_KEY 100 f\ wP}c'  
#define CTRLBIT 0x04 V'";u?h#S  
#define ALTBIT 0x02 , 8NY<sFh  
#define SHIFTBIT 0x01 @c<*l+Qc  
#pragma data_seg("shareddata") &gn^i!%Z)  
HHOOK hHook =NULL; }4!R2c  
UINT nHookCount =0; F9sVMV  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey kAF[K,G G  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT liW0v!jBo  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey GgoPwl#{  
static int KeyCount =0; _`/: gkZS  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift y^o*wz:D*  
#pragma data_seg() hcvWf\4'#q  
HINSTANCE hins; cax]l O  
void VerifyWindow(); ~ >af"<  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) kvzGI>H:  
//{{AFX_MSG_MAP(CHookApp) TNA?fm  
// NOTE - the ClassWizard will add and remove mapping macros here. HQ8oOn  
// DO NOT EDIT what you see in these blocks of generated code! 0]C~CvO  
//}}AFX_MSG_MAP $YM>HZe-  
END_MESSAGE_MAP() 2L#$WuM~^  
+mReWf:o  
CHookApp::CHookApp() ZSKSMI%D  
{ XY[uyR4Z  
 // TODO: add construction code here, n M +(  
 // Place all significant initialization in InitInstance J2 "n:  
} 6!|-,t><  
]]\\Y|0  
CHookApp theApp; ,k*g `OTW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) L'dR;T[;  
{ 9sQ4 $  
 BOOL bProcessed=FALSE; 2|xNT9RW  
 if(HC_ACTION==nCode) JG%y_ Qy?K  
 { G@Z,Hbgm  
  if((lParam&0xc0000000)==0xc0000000){// Key up vJ__jO"Sq  
   switch(wParam) orB8q((  
   { ?mdgY1  
    case VK_MENU: eIEr\X4\~~  
     MaskBits&=~ALTBIT; [b-wak})aD  
     break; xFU*,Y  
    case VK_CONTROL: ;naD`([  
     MaskBits&=~CTRLBIT; fVlTsc|e  
     break; >z'kCv  
    case VK_SHIFT: eyq8wQT  
     MaskBits&=~SHIFTBIT; y\]~S2}G  
     break; 39jnoT  
    default: //judge the key and send message [89qg+z  
     break; *.X!AJ;M=O  
   } otQulL)T/  
   for(int index=0;index<MAX_KEY;index++){ "PM!03rb  
    if(hCallWnd[index]==NULL) "pdq_35  
     continue; HmWU;9Vn+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Bnju_)U5)  
    { r|U'2+vn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kPt9(E]  
     bProcessed=TRUE; 1bW[RK;GE  
    } 7,.Hj&'B  
   } pBW|d\8  
  } da c?b (  
  else if((lParam&0xc000ffff)==1){ //Key down RcQo1  
   switch(wParam) )<w`E{q  
   { q8U*  
    case VK_MENU: MO7:ZYq  
     MaskBits|=ALTBIT; 5(@P1Bi  
     break; K!|%mI8gk  
    case VK_CONTROL: ?.&]4z([  
     MaskBits|=CTRLBIT; oLJP@J  
     break; 9mdp \A  
    case VK_SHIFT: ghXh nxG  
     MaskBits|=SHIFTBIT; ,uEi*s>  
     break; ^rz8c+ly  
    default: //judge the key and send message $S~e"ca1  
     break; Q fI =  
   } Q+d9D1b  
   for(int index=0;index<MAX_KEY;index++) J|k~e,C  
   { Im9^mVe  
    if(hCallWnd[index]==NULL) 7O3\  
     continue; Ol8ma`}Nq3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) . }QR~IR'  
    { yFp8 >  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X{SD3j=G#  
     bProcessed=TRUE; ~(2G7x)  
    } `WDN T0@M  
   } ^j1?LB  
  } s`2Hf&%aZJ  
  if(!bProcessed){ >L6V!  
   for(int index=0;index<MAX_KEY;index++){ &%QtUPvr9  
    if(hCallWnd[index]==NULL) ]AlRu(  
     continue; 9Ra_[1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) R:7j`gHJ|9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $7q'Be@{  
   } T\g%.  
  } mz\d>0F U.  
 } tlo"tl_]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )L?JH?$C  
} O9>& E;`5  
sWp]Zy  
BOOL InitHotkey() Gq4~9Tm)*  
{ tA?P$5?-*  
 if(hHook!=NULL){ #S+GI!  
  nHookCount++; MqXN,n+`k  
  return TRUE; [([?+Ouy  
 } 0( fN  
 else ]m0MbA  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "g7`Ytln  
  if(hHook!=NULL) *Q bPz4,"  
   nHookCount++; Ql-RbM  
  return (hHook!=NULL); !@E=\Sm8EV  
} 3RpDIl`0  
BOOL UnInit() d, j"8\@  
{ WZ}c)r*R  
 if(nHookCount>1){ 3DRXao  
  nHookCount--; 1X\dH<B}  
  return TRUE; .%>UA|[~:  
 } S[!-M\b  
 BOOL unhooked = UnhookWindowsHookEx(hHook); NNC@?A7  
 if(unhooked==TRUE){ f`@$ saFD  
  nHookCount=0; /I~iUND"G  
  hHook=NULL; 9kj71Jp&}  
 } 8 /Z  
 return unhooked; @$ E&H`da  
} ;j]0GD,c$  
Y4,~s64e  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )+2GF0%  
{ `"J=\3->  
 BOOL bAdded=FALSE; TqK`X#Zq  
 for(int index=0;index<MAX_KEY;index++){ `mV&[`NZ  
  if(hCallWnd[index]==0){ /5:C$ik  
   hCallWnd[index]=hWnd; k mjSSh/t  
   HotKey[index]=cKey; WXP=U^5Si  
   HotKeyMask[index]=cMask; Y9fktg.  
   bAdded=TRUE; r(./00a  
   KeyCount++; E/9h"zowS  
   break; uNe5Mv|}  
  } Ndq|Hkd  
 } ]Ga}+^  
 return bAdded; s-]k7a 2V  
} h?[3{Z^  
WoGK05w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -:IG{3fnu  
{ pE(\q+1<  
 BOOL bRemoved=FALSE; K 2PV^Y  
 for(int index=0;index<MAX_KEY;index++){ <I .p{Z  
  if(hCallWnd[index]==hWnd){ :Z|lGH =  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ wW s<{ T  
    hCallWnd[index]=NULL; (as'(+B  
    HotKey[index]=0; iR j/Tm*T'  
    HotKeyMask[index]=0; kgfOH.P  
    bRemoved=TRUE; UO(B>Abp  
    KeyCount--;  hM   
    break; ')_Gm{A#p  
   } PGZ.\i  
  } v#u]cmI  
 } kGhWr M  
 return bRemoved; z[:UPPbW  
} 0&$+ CWSM  
lN94 b3_W  
void VerifyWindow() @7 xb/&N  
{ P7r?rbO"  
 for(int i=0;i<MAX_KEY;i++){ !%b.k6%>w  
  if(hCallWnd!=NULL){ Gw3eO&X3i  
   if(!IsWindow(hCallWnd)){ "5Oi[w&F5  
    hCallWnd=NULL;  e;8>/G  
    HotKey=0; jG=*\lK6  
    HotKeyMask=0; |@pJ]  
    KeyCount--; .Lz\/ OS  
   } 3f9J! B`n  
  } cQDn_Sjhi  
 } rq'Cj<=Zj  
} fhqc[@Y[  
iyNyj44 H  
BOOL CHookApp::InitInstance() 6b+\2-eq  
{ -DDH)VO  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 2b+cz  
 hins=AfxGetInstanceHandle(); z:f[<`,GT  
 InitHotkey(); :@KU_U)\  
 return CWinApp::InitInstance(); CU)'x E  
} ! 7,rz1s73  
Th,15H DA  
int CHookApp::ExitInstance() v  P8.{$  
{ y05(/NH>  
 VerifyWindow(); pUby0)}t  
 UnInit(); 3DRbCKNL  
 return CWinApp::ExitInstance(); tj 6 #lM9  
} Z\8TpwD2  
7m0sF<P{g  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !` S ?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) RE/'E?G  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ eaP,MkK&  
#if _MSC_VER > 1000 ,aS6|~ac4  
#pragma once g[fCvWm#d  
#endif // _MSC_VER > 1000 v,w/g|  
NYtp&[s2-  
class CCaptureDlg : public CDialog t(/b'Peq  
{ Dg~r%F  
 // Construction HU ]Yv+3   
 public: @dE|UZ=(  
  BOOL bTray; "R@N}q<*v2  
  BOOL bRegistered; zOA{S~>  
  BOOL RegisterHotkey(); @? 4-  
  UCHAR cKey; b['Jr% "O  
  UCHAR cMask; JmB7tRM8  
  void DeleteIcon(); HFYN(nz}[  
  void AddIcon(); hnha1 f  
  UINT nCount; u'cM}y&  
  void SaveBmp(); nxH=Ut7{  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2Jo'!|]  
  // Dialog Data fiA_6  
  //{{AFX_DATA(CCaptureDlg) 6jjmrc[#}X  
  enum { IDD = IDD_CAPTURE_DIALOG }; B3[;}8u>  
  CComboBox m_Key; fR<_4L  
  BOOL m_bControl; 4:<74B  
  BOOL m_bAlt; c6gRXp'ID  
  BOOL m_bShift; B-`d7c5  
  CString m_Path; In)8AK(Hw  
  CString m_Number; wi/Fx=w  
  //}}AFX_DATA _r+2o-ZR  
  // ClassWizard generated virtual function overrides ?)<DEu:Y  
  //{{AFX_VIRTUAL(CCaptureDlg) Lqy]bnY  
 public: 2lNZwV7  
  virtual BOOL PreTranslateMessage(MSG* pMsg); d*80eB9P  
 protected: 71`)@y,Z,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Hq'mv_}qG  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); WVDkCo@  
  //}}AFX_VIRTUAL \k\ {S2SU  
  // Implementation Htd-E^/  
 protected: SYkLia(Ty  
  HICON m_hIcon; KS%LXc('  
  // Generated message map functions jA@jsv  
  //{{AFX_MSG(CCaptureDlg) }gw \w?/  
  virtual BOOL OnInitDialog(); e= $p(  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); :%ms6j/B&V  
  afx_msg void OnPaint(); fWo}gH~  
  afx_msg HCURSOR OnQueryDragIcon(); h:{rjXK  
  virtual void OnCancel(); Wj0=cIb  
  afx_msg void OnAbout(); NzB"u+jB  
  afx_msg void OnBrowse(); jG8W|\8  
  afx_msg void OnChange(); f5p>oXo4b  
 //}}AFX_MSG 5~GHAi  
 DECLARE_MESSAGE_MAP() "b)Y5[nW  
}; M*ZR+pq,  
#endif +o+e*B7Eh  
j >f  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file QN`K|,}H^  
#include "stdafx.h" v%gkQa  
#include "Capture.h" <Uj~S  
#include "CaptureDlg.h" Mrpz(})  
#include <windowsx.h> ~*aPeJ  
#pragma comment(lib,"hook.lib") V`*N2ztSL  
#ifdef _DEBUG qPle=6U[IL  
#define new DEBUG_NEW HLMcOuj  
#undef THIS_FILE d.wu   
static char THIS_FILE[] = __FILE__; Wp7lDx  
#endif xz!b@5DR'%  
#define IDM_SHELL WM_USER+1 ZBw]H'sT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -!_f-Nny  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x"/DCcZ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; p5RnFe l  
class CAboutDlg : public CDialog ]B8`b  
{ 3$<u3Zi6  
 public: ']Q4SB"q  
  CAboutDlg(); Vl"20):  
  // Dialog Data wm1`<r^M.  
  //{{AFX_DATA(CAboutDlg) T22 4L.?  
  enum { IDD = IDD_ABOUTBOX }; )\nKr;4MH  
  //}}AFX_DATA 9]u=b\fzZ  
  // ClassWizard generated virtual function overrides Ep>} S  
  //{{AFX_VIRTUAL(CAboutDlg) =|}_ASbzw  
 protected: A kMP)\Q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^,-2";2Xh  
  //}}AFX_VIRTUAL RCZ"BxleU  
  // Implementation g=G>4Ua3  
 protected: pl#2J A8  
  //{{AFX_MSG(CAboutDlg) OKW}8qM  
  //}}AFX_MSG V47z;oMXct  
  DECLARE_MESSAGE_MAP() &A/k{(.XP  
}; azK7kM~  
N.~zQVO#R  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +8xC%eE  
{ e\8|6< o[  
 //{{AFX_DATA_INIT(CAboutDlg) U# +$N3%  
 //}}AFX_DATA_INIT nYFM^56>_  
} gWK[%.Jnw  
Am'%tw ~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #gq!L  
{ }Qu kn  
 CDialog::DoDataExchange(pDX); u~pBMg ,  
 //{{AFX_DATA_MAP(CAboutDlg) 4Tdp;n\F  
 //}}AFX_DATA_MAP #fGI#]SG?  
} E4QLXx6Wa&  
,=IGqw  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 5:yRFzhqd  
 //{{AFX_MSG_MAP(CAboutDlg) 1IPRI<1U  
 // No message handlers Q "vhl2RX  
 //}}AFX_MSG_MAP YB}m1 g`  
END_MESSAGE_MAP() \[9^,Q P  
le|Rhs%Z%  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) vojXo|c  
: CDialog(CCaptureDlg::IDD, pParent) |[_%zV;p>v  
{ ,,c+R?D  
 //{{AFX_DATA_INIT(CCaptureDlg) Fks #Y1rI  
  m_bControl = FALSE; 1/ 3<u::  
  m_bAlt = FALSE; >bFrJz}  
  m_bShift = FALSE; jwL\|B oE  
  m_Path = _T("c:\\"); oTN:Q"oK7?  
  m_Number = _T("0 picture captured."); "wR1=&gk  
  nCount=0; .<zN/&MXf  
  bRegistered=FALSE; : i{tqY%  
  bTray=FALSE; Q?2Gw N  
 //}}AFX_DATA_INIT _iF*BnmN  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ()Q#@?c~  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); I {%Y0S  
} <U y $b4h  
Ay6]vU  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) E?0Vo%Vh  
{ c'INmc I|  
 CDialog::DoDataExchange(pDX); Urz9S3#\  
 //{{AFX_DATA_MAP(CCaptureDlg) jf.WmiDC  
  DDX_Control(pDX, IDC_KEY, m_Key); -asjBSo*D  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); >a;LBQ0  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9tWpxrig%  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ZPG~@lU  
  DDX_Text(pDX, IDC_PATH, m_Path); %O$=%"D6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Nwo*tb:  
 //}}AFX_DATA_MAP <@$+uZt+  
} +G6 Ge;  
B7wzF"  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =$y;0]7Lwi  
//{{AFX_MSG_MAP(CCaptureDlg) Kk,u{EA  
 ON_WM_SYSCOMMAND()  }}Zg/(  
 ON_WM_PAINT() Rk-G| 52g  
 ON_WM_QUERYDRAGICON() h$XoR0  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) h$#PboLd  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Z*b$&nM  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #uV J  
//}}AFX_MSG_MAP 0#NbAMt  
END_MESSAGE_MAP() "=ki_1/P  
Y4+ ]5;B8  
BOOL CCaptureDlg::OnInitDialog() ($Op*bR  
{ kRr/x-"  
 CDialog::OnInitDialog(); X f{9rZ+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); r0@s3/  
 ASSERT(IDM_ABOUTBOX < 0xF000); dOK]Su  
 CMenu* pSysMenu = GetSystemMenu(FALSE); +s6v!({Z  
 if (pSysMenu != NULL) !*3]PZ25a(  
 { *+k yuY J  
  CString strAboutMenu; Z^BZH/I?  
  strAboutMenu.LoadString(IDS_ABOUTBOX); nly}ly Q/  
  if (!strAboutMenu.IsEmpty()) p({Lp}'  
  { YCVT0d  
   pSysMenu->AppendMenu(MF_SEPARATOR); 0Y'ow=8M  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8;"9A  
  } K%W;-W*'  
 } /6F\]JwU  
 SetIcon(m_hIcon, TRUE); // Set big icon &'`ki0Xh;  
 SetIcon(m_hIcon, FALSE); // Set small icon Q{5.;{/eC  
 m_Key.SetCurSel(0); E,dUO;  
 RegisterHotkey(); ;<GK{8  
 CMenu* pMenu=GetSystemMenu(FALSE); $E!f@L  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); jo1z#!|Yw}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Vc6 >i|"-O  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); |#{ i7>2U  
 return TRUE; // return TRUE unless you set the focus to a control YNl".c  
} 4c qf=  
&EYoviFp  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^O =G%de  
{ >|`1aCg,  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) BR-wL3x b  
 { "',;pGg|K  
  CAboutDlg dlgAbout; E!.&y4  
  dlgAbout.DoModal(); WJ)4rQ$o  
 } sxS%1hp3  
 else "LH!Trl@k  
 { (`_fP.Ogb  
  CDialog::OnSysCommand(nID, lParam); )#1!%aQ  
 } ? HNuffk  
} %!AzFL J|Z  
KX3A|  
void CCaptureDlg::OnPaint() kma>'P`G  
{ \YFM5l;IU  
 if (IsIconic()) m>F:dI  
 { +S+=lu _  
  CPaintDC dc(this); // device context for painting ycwkF$7  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7 , _b  
  // Center icon in client rectangle ,%BDBZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); #_`q bIOAj  
  int cyIcon = GetSystemMetrics(SM_CYICON); : bi(mX7t  
  CRect rect; eX lJ=S}  
  GetClientRect(&rect); )n 1[#x^I  
  int x = (rect.Width() - cxIcon + 1) / 2; M# -E  
  int y = (rect.Height() - cyIcon + 1) / 2; }%jpqip  
  // Draw the icon C"mWO Y2]  
  dc.DrawIcon(x, y, m_hIcon); D^V)$ME  
 } >dJ~  
 else [}GK rI  
 { ;"ESN)*|i  
  CDialog::OnPaint(); ~b!la  
 } L|:CQ  
} Ctn?O~u  
5~T+d1md  
HCURSOR CCaptureDlg::OnQueryDragIcon() dFhyT.Y?  
{ HZ}Igw.Z  
 return (HCURSOR) m_hIcon; 7fO<=ei:  
} ;+|Z5+7!6  
@iXBy:@  
void CCaptureDlg::OnCancel() ;ND[+i2MN  
{ `4X.UPJ  
 if(bTray) z$}9f*W}B  
  DeleteIcon(); MEJX5qG6m  
  CDialog::OnCancel(); 98O]tL+k/u  
} guGX  G+  
/V`SJ"  
void CCaptureDlg::OnAbout() ]W4{|%@H"  
{ ;H`@x Lv*  
 CAboutDlg dlg; u0,QsD)_X0  
 dlg.DoModal(); {:VK}w  
} H_t0$x(\  
 ;Ss!OFK  
void CCaptureDlg::OnBrowse() Yt,MXm\  
{ %#~wFW|]x  
 CString str; w0Ex}  
 BROWSEINFO bi; v_pe=LC{-e  
 char name[MAX_PATH]; :@"o.8p   
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 9L3P'!Z  
 bi.hwndOwner=GetSafeHwnd(); g-_=$#&{  
 bi.pszDisplayName=name; ebNRZJ?C,  
 bi.lpszTitle="Select folder"; |2n*Ds'  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; OHj>ufwVq  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); )\VuN-d  
 if(idl==NULL) cn/&QA"  
  return; \lQI;b;$  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); j6~`C ?(  
 str.ReleaseBuffer(); =q)+_@24>d  
 m_Path=str; 77sG;8HE  
 if(str.GetAt(str.GetLength()-1)!='\\') X[H.t$w5A  
  m_Path+="\\"; =T26vu   
 UpdateData(FALSE); }vx,i99W?  
} #3LZX!  
DO-M0L  
void CCaptureDlg::SaveBmp() DNgh#!\X  
{ QRKP;aYt  
 CDC dc; GHn0(o&K  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;r~1TUKb  
 CBitmap bm; Pi |Z\j)  
 int Width=GetSystemMetrics(SM_CXSCREEN); C9MK3vtD.  
 int Height=GetSystemMetrics(SM_CYSCREEN); &Ejhw3Nw  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 7kA+F +f  
 CDC tdc; _Li.}g@Bd  
 tdc.CreateCompatibleDC(&dc); KWD{_h{R  
 CBitmap*pOld=tdc.SelectObject(&bm); zDtC]y'  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); T+EwC)Ll  
 tdc.SelectObject(pOld); &[j9Up'   
 BITMAP btm; Cg~1<J?2  
 bm.GetBitmap(&btm); 7G;1n0m-T  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Opg_-Bf  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .57F h)Y  
 BITMAPINFOHEADER bih; YT'V/8US  
 bih.biBitCount=btm.bmBitsPixel; p^q/u  
 bih.biClrImportant=0; dqQJC qc!  
 bih.biClrUsed=0; 8au Gz ,"  
 bih.biCompression=0; 3X;>cv#B  
 bih.biHeight=btm.bmHeight; YIZu{  
 bih.biPlanes=1; 2vG X\W% 3  
 bih.biSize=sizeof(BITMAPINFOHEADER); -} j(_] t  
 bih.biSizeImage=size; [.xc`CF  
 bih.biWidth=btm.bmWidth; _w %:PnO  
 bih.biXPelsPerMeter=0; |@1(^GX  
 bih.biYPelsPerMeter=0; <*^|Aj|#  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); UY({[?Se  
 static int filecount=0; !T:7xEr  
 CString name; [PiMu,O[v  
 name.Format("pict%04d.bmp",filecount++); NKB["+S<  
 name=m_Path+name; T]1.":   
 BITMAPFILEHEADER bfh; gpzFY"MS=  
 bfh.bfReserved1=bfh.bfReserved2=0; ecH7")  
 bfh.bfType=((WORD)('M'<< 8)|'B'); o+ {i26%  
 bfh.bfSize=54+size; R=, pv'  
 bfh.bfOffBits=54; ;=^J_2ls  
 CFile bf; c2 :,  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 33eOM(`D[  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +jq@!P"}d  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +Lc+"0*gV*  
  bf.WriteHuge(lpData,size); IQ~Anp^R  
  bf.Close(); AA ~7"2e  
  nCount++; sRcS-Yw[S  
 } B>d49(jy  
 GlobalFreePtr(lpData); yHs9J1S f  
 if(nCount==1) b%@9j;  
  m_Number.Format("%d picture captured.",nCount); x#5[i;-c  
 else  ('BB9#\t  
  m_Number.Format("%d pictures captured.",nCount); Lr\(7r  
  UpdateData(FALSE);  vmfFR  
} [4B (rra  
vfhoN]v  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $/JXI?K  
{ P@5-3]m=  
 if(pMsg -> message == WM_KEYDOWN) g}hNsU=$5~  
 { +gBD E :  
  if(pMsg -> wParam == VK_ESCAPE) u| "YS-dH  
   return TRUE; `O.pT{Lf  
  if(pMsg -> wParam == VK_RETURN) rij%l+%@#  
   return TRUE; ~mah.8G  
 } 'aD"v>  
 return CDialog::PreTranslateMessage(pMsg); <j#IR  
} U Lq`!1{   
QJR},nZ3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O)&ME  
{ uP8 cW([  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ k`[>B k%b  
  SaveBmp(); S}0-2T[  
  return FALSE; 9aIv|cS?  
} Q($@{[lT  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3]'h(C  
 CMenu pop; TBF{@{.d  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Y}yh6r;i  
 CMenu*pMenu=pop.GetSubMenu(0); 3w[uc~f  
 pMenu->SetDefaultItem(ID_EXITICON); |@R/JGB^  
 CPoint pt; &lzCRRnvt  
 GetCursorPos(&pt); @RoU   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); TOSk+2P  
 if(id==ID_EXITICON) f1o^:}5x  
  DeleteIcon(); SjJ$Oinc  
 else if(id==ID_EXIT) *(i%\  
  OnCancel(); r<P?F  
 return FALSE; &js$qgY  
} |6Iw\YU  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); G2c\"[N1/  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ]:?hU^H]<  
 AddIcon(); ?=kH}'igq  
 return res; 7Ot&]M  
} ?G&J_L=@Y  
Dp^=%F{t  
void CCaptureDlg::AddIcon() ~:_10g]r  
{ TDg<&ND3  
 NOTIFYICONDATA data; XC/M:2$  
 data.cbSize=sizeof(NOTIFYICONDATA); 6B>*v`T:  
 CString tip; |-GbHfz  
 tip.LoadString(IDS_ICONTIP); 0BjP|API  
 data.hIcon=GetIcon(0); duCXCX^n T  
 data.hWnd=GetSafeHwnd(); }J\7IsM&  
 strcpy(data.szTip,tip); C^U>{jf !  
 data.uCallbackMessage=IDM_SHELL; q="ymx~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; += gU`<\  
 data.uID=98; cauKG@:2F  
 Shell_NotifyIcon(NIM_ADD,&data); 7eZwpg?K  
 ShowWindow(SW_HIDE); DC$> 5FDv  
 bTray=TRUE; XwU1CejP0  
} 4}YHg&@\d%  
;1TQr3w  
void CCaptureDlg::DeleteIcon() YsTF10  
{ j zZEP4  
 NOTIFYICONDATA data;  {qH+S/  
 data.cbSize=sizeof(NOTIFYICONDATA); bD 1IY1  
 data.hWnd=GetSafeHwnd(); 8}Maj  
 data.uID=98; np7!y U  
 Shell_NotifyIcon(NIM_DELETE,&data); 5* ~E dT  
 ShowWindow(SW_SHOW); 0{Zwg0&  
 SetForegroundWindow(); = o1&.v2j  
 ShowWindow(SW_SHOWNORMAL); \ERHnh  
 bTray=FALSE; P>*`<$FR  
} hN;$'%^  
f+QDjJ?z  
void CCaptureDlg::OnChange() Jy]}'eE?pr  
{ 6a{b%e`  
 RegisterHotkey(); DwXSlsN3v  
} (xBWxeL~  
k]A$?C0Q<%  
BOOL CCaptureDlg::RegisterHotkey() {=y~O  
{ :C#(yp  
 UpdateData(); M8FC-zFs  
 UCHAR mask=0; RUV:   
 UCHAR key=0; F @Wb<+0  
 if(m_bControl) il:RE8  
  mask|=4; 3 k)P*ME#  
 if(m_bAlt) KKwJ=za  
  mask|=2; ~\7peH%  
 if(m_bShift) zids2/_*  
  mask|=1; <r8s= <:  
  key=Key_Table[m_Key.GetCurSel()]; M >s,I^  
 if(bRegistered){ /JP%gD"8  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); M/8EaQs}  
  bRegistered=FALSE; 0"c(n0L  
 } W -5wjc  
 cMask=mask; R%r<AL5kJk  
 cKey=key; L'x[wM0w;  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); vnv:YQV/ir  
 return bRegistered; 2&:w_KJ  
} E uk[ @1  
k'1i quc#u  
  四、小结 SA -r61  
Eg]tDPN1  
  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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