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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: =o dkz}bU  
  >O`l8tM  
  一、实现方法 0Dv JZ|e  
#} ,x @]p  
  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: =J'P.  
Qu*1g(el!o  
#pragma data_seg("shareddata") _cI_#  
HHOOK hHook =NULL; //钩子句柄 FY0%XW  
UINT nHookCount =0; //挂接的程序数目 $r.U  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 [2Mbk~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 1hQN8!:<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey "l~Ci7& !a  
static int KeyCount =0; T`YwJ6N  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ]Tp U"JD  
#pragma data_seg() 0NE{8O0;Fr  
~9o6 W",  
  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。 _ *(bmJM  
oY9FK{  
  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: $Rtgr{ {;"  
o=+Z.-q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR {+T/GBF-K=  
cKey,UCHAR cMask) EYzg%\HH  
{ t=wXTK5"  
 BOOL bAdded=FALSE; D> ef  
 for(int index=0;index<MAX_KEY;index++){ 2OBfHO~D  
  if(hCallWnd[index]==0){ m9$:9yRm  
   hCallWnd[index]=hWnd; D9ufoa&ua  
   HotKey[index]=cKey; cSD{$B:  
   HotKeyMask[index]=cMask; 93%{scrm  
   bAdded=TRUE; <-C!;Ce{  
   KeyCount++; BNm4k7 ]M  
   break; 7ET jn)%bs  
  } GuQRn  
 } %uDG75KP{  
 return bAdded; Gm8E<iTP  
} pK_?}~  
//删除热键 9(1rh9`=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #*$p-I=  
{ D@54QJ<  
 BOOL bRemoved=FALSE; J\co1kO9/  
 for(int index=0;index<MAX_KEY;index++){ n@>wwp  
  if(hCallWnd[index]==hWnd){ $^%N U  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0%C^8%(x  
    hCallWnd[index]=NULL; C 0C0GqN,  
    HotKey[index]=0; H'g?llh1J  
    HotKeyMask[index]=0; 4cgIEw[6  
    bRemoved=TRUE; 0irr7Y  
    KeyCount--; ROAI9sW0  
    break; v|t{1[C  
   } ?m%h`<wgMc  
  } %e%7oqR?  
 } _^!vCa7f  
 return bRemoved; Opg#*w%-  
} [ = M%  
|7F*MP  
K'b*A$5o  
  DLL中的钩子函数如下: L4' [XcY  
L10IF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %_)zWlN  
{ |"7Pv skT  
 BOOL bProcessed=FALSE; S3 \jcgrS  
 if(HC_ACTION==nCode) E,"&-`/2v  
 { JSVeU54T^<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ^$?qT60%d|  
   switch(wParam) APBK9ky  
   {  :h5J r8  
    case VK_MENU: pA4 ,@O  
     MaskBits&=~ALTBIT; Q+[ .Y&  
     break; &y. dmW  
    case VK_CONTROL: 8e:vWgQpL  
     MaskBits&=~CTRLBIT; %vqT#+x  
     break; [1Dm<G u@  
    case VK_SHIFT: MWwJzVL8  
     MaskBits&=~SHIFTBIT; 3(_!`0#F%  
     break; )iE"Tl  
    default: //judge the key and send message BSUPS+@+  
     break; T_hV%   
   } !C&%T]  
   for(int index=0;index<MAX_KEY;index++){ Z5)eREi=  
    if(hCallWnd[index]==NULL) ]|oJ)5P  
     continue; .[pUuVq]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F'W> 8  
    { Hcv u7uD  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4br6$  
     bProcessed=TRUE; U6j/BJT"  
    } ^X1wI9V  
   } &d^=s iL  
  } %$X\"  
  else if((lParam&0xc000ffff)==1){ //有键按下 Xa,&ef&q  
   switch(wParam) ^X? D#\  
   { Ie_I7YJ  
    case VK_MENU: 3:`XG2'  
     MaskBits|=ALTBIT; *8A6Q9YT  
     break; /^<en(0=P  
    case VK_CONTROL: BQrL7y  
     MaskBits|=CTRLBIT; F @SG((`  
     break; *@M3p}',M  
    case VK_SHIFT: %J P!{mqj  
     MaskBits|=SHIFTBIT; Da,Tav%b  
     break; "kSwa16O  
    default: //judge the key and send message d<T%`:s<  
     break; B@cz ?%]  
   } 2i:zz? 'p`  
   for(int index=0;index<MAX_KEY;index++){ h7W}OF_=y  
    if(hCallWnd[index]==NULL) 3E|;r _; 8  
     continue; ejcwg*i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  rz  
    { &?<AwtNN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _Z#eS/,O@  
     bProcessed=TRUE; 8&(-8  
    } 4XG]z_+I  
   } VXC4%  
  } )/Y~6A9>  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 X>3^a'2,E  
   for(int index=0;index<MAX_KEY;index++){ iJnh$jo  
    if(hCallWnd[index]==NULL) h|W%4|]R)  
     continue; TVkcDS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $I8[BYblB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &9P<qU^N)  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 a@ W7<9fY;  
   } OlGR<X  
  } r%-n*_?.s  
 } TA;,>f*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); uBeNXOre  
} n t HT  
" i`8l.Lc  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: <94WZ?{p  
|5ONFd e"0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); FdxsU DL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [x_s/"Md;  
rm|7 [mK  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: %V_eJC""?  
mw+j|{[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) h$&rE@N|  
{ 0xP:9rm  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) {hd-w4"115  
 { OmNn,PCl8  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 # "r kuDO  
  SaveBmp(); `ue?Z%p|  
  return FALSE; ,+-h7^{`  
 } G8P+A1 f/>  
 …… //其它处理及默认处理 SCq3Ds^  
} /djACA  
7^wE$7hS  
cjY@Ot*i$  
  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。 4A  o{M  
ND,`QjmZ  
  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。 _LLshV3  
4x]NUt  
  二、编程步骤 Czh8zB+r  
Mjw[:70  
  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"; {PmzkT}LF  
B\zoJg&7(  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; @_O3&ZK  
.zwVCW,u  
  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+> V|zKuk  
B1,?{Ur  
  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; ?N _)>&b  
 T{Hf P  
  5、 添加代码,编译运行程序。 |Gc&1*$  
88YC0!Ni  
三、程序代码 /j %_t  
L9J;8+ge  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL gvr]]}h:O  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) .+uVgSN  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ am (#Fa  
#if _MSC_VER > 1000 J/[7d?hI/  
#pragma once \E&thp  
#endif // _MSC_VER > 1000 I+~\ w N  
#ifndef __AFXWIN_H__ k(9s+0qe  
#error include 'stdafx.h' before including this file for PCH kaC+I"4c  
#endif B[7A  
#include "resource.h" // main symbols FvA|1c  
class CHookApp : public CWinApp @7X\tV.Z  
{ QX+Y(P`vMK  
 public: 'A1E^rl]=  
  CHookApp(); _Q^y_f  
  // Overrides W U0UG$o`  
  // ClassWizard generated virtual function overrides 0#]!#1utg  
  //{{AFX_VIRTUAL(CHookApp) 0STk)> 3$-  
 public: i6A$1(:h  
  virtual BOOL InitInstance(); oVreP  
  virtual int ExitInstance(); e sGlMq  
  //}}AFX_VIRTUAL oFn4%S:  
  //{{AFX_MSG(CHookApp) T7s+9CE  
  // NOTE - the ClassWizard will add and remove member functions here.  %|bN@@  
  // DO NOT EDIT what you see in these blocks of generated code ! 8_Jj+  
  //}}AFX_MSG 30BR 0C  
  DECLARE_MESSAGE_MAP() 2X^iV09  
}; w4aiI2KFq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Pgx+\;w"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 13\Sh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a YR\<02  
BOOL InitHotkey(); 9M nem*  
BOOL UnInit(); CP@o,v-  
#endif epYj+T  
^X$ I=ro  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. T 77)Np  
#include "stdafx.h" [e1\A&T  
#include "hook.h" g\qX7nIH?  
#include <windowsx.h> jigbeHRy  
#ifdef _DEBUG y]MWd#U  
#define new DEBUG_NEW O2$!'!hz  
#undef THIS_FILE _3I3AG0e  
static char THIS_FILE[] = __FILE__; @X|ok*v`  
#endif ^`/V i  
#define MAX_KEY 100 (+@faP   
#define CTRLBIT 0x04 Lq%[A*`^  
#define ALTBIT 0x02 c.\:peDk  
#define SHIFTBIT 0x01 svF*@(- P#  
#pragma data_seg("shareddata") [KD}U-(Wg  
HHOOK hHook =NULL; M Ey1~h/  
UINT nHookCount =0; @H3|u`6V  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey D`8E-Bq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;g6 nHek  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey V02309Y  
static int KeyCount =0; & 8zk3  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift RlPjki"Mg  
#pragma data_seg() l(.7t'  
HINSTANCE hins; :S#eg1y.w]  
void VerifyWindow(); vW9^hbdx  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) {~":;  
//{{AFX_MSG_MAP(CHookApp) @f-0X1C."N  
// NOTE - the ClassWizard will add and remove mapping macros here. y B1W>s8&  
// DO NOT EDIT what you see in these blocks of generated code! Cx$9#3\  
//}}AFX_MSG_MAP BzN/6VEw  
END_MESSAGE_MAP()  h=:*7>}  
;U8dm"  
CHookApp::CHookApp() YHJ'  
{ 7eTA`@v5A  
 // TODO: add construction code here, ;.L!%$0i#  
 // Place all significant initialization in InitInstance T..-)kL+p  
} 69N1 mP  
)0'Y et}  
CHookApp theApp; >h|UCJ1 `  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) HE9. k.sS  
{ "MW55OWYU  
 BOOL bProcessed=FALSE; 1LV|t+Sex  
 if(HC_ACTION==nCode) >>/nuWdpO  
 { "sC$%D<oc  
  if((lParam&0xc0000000)==0xc0000000){// Key up \? J=mE@;1  
   switch(wParam) _CHKh*KHML  
   { 6ch@Be5*  
    case VK_MENU: VOD1xWrb  
     MaskBits&=~ALTBIT; qdKh6{  
     break; 7&#'c8]/qh  
    case VK_CONTROL: Ty)gPh6O  
     MaskBits&=~CTRLBIT; ]eY Qio!  
     break; 5L/Yi  
    case VK_SHIFT: Q,ZkeWQ7%  
     MaskBits&=~SHIFTBIT; v\J!yz  
     break; =#7s+d-  
    default: //judge the key and send message D-;J;m \  
     break; AviT+^7E  
   } Kv(Y }  
   for(int index=0;index<MAX_KEY;index++){ M|5^':Y  
    if(hCallWnd[index]==NULL) ^w.k^U=B  
     continue; VG? yL2y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ER0TY,  
    { }Ox2olUX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Z`e$~n(Bh  
     bProcessed=TRUE; ':5U&  
    } tW'qO:y+  
   } ZKVp[A  
  } [I#Q  
  else if((lParam&0xc000ffff)==1){ //Key down b=6ZdN1  
   switch(wParam) = .fc"R|<K  
   { 8f5%xY$  
    case VK_MENU: 5;r({ J  
     MaskBits|=ALTBIT; `PXoJl  
     break; !.x=r  
    case VK_CONTROL: Y;~EcM  
     MaskBits|=CTRLBIT; rCV$N&rK  
     break; LX&=uv%-^  
    case VK_SHIFT: Ly@U\%.  
     MaskBits|=SHIFTBIT; MZgmv  
     break; &Z#Vw.7U  
    default: //judge the key and send message Yqq$kln  
     break; zW|$x<M^  
   } pP=_@ 3 D  
   for(int index=0;index<MAX_KEY;index++) M)bC%(xJ  
   { Zb5T90s%  
    if(hCallWnd[index]==NULL) p]atH<^;K  
     continue; 1aXIhk4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DR#3njjEC  
    {  M}_M_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0nF>zOmc  
     bProcessed=TRUE; )AZ`R8-A  
    } Ip1QVND  
   } 2}W6{T'  
  } ^/4 {\3  
  if(!bProcessed){ ?,A8  fR  
   for(int index=0;index<MAX_KEY;index++){ n=<q3}1Jej  
    if(hCallWnd[index]==NULL) J-HabHv  
     continue; G5C#i7cpm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) oW` *FD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #CBo  
   } #RsIxpc  
  } PDa06(t7  
 } ^^W`Lh%9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); dW] Ej"W  
} "'LOaf$X  
qX}dbuDE"P  
BOOL InitHotkey() `0/gs  
{ k;9#4^4(  
 if(hHook!=NULL){ O;.d4pO(tC  
  nHookCount++; I+-Rs2wb  
  return TRUE; 4.$hHFqS^5  
 } |G5=>W  
 else ?L.p9o-S0  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #oS  
  if(hHook!=NULL) -F~9f>  
   nHookCount++; Xqq?S  
  return (hHook!=NULL); 2n\i0?RD  
} J@&$U7t  
BOOL UnInit() ** "s~  
{ s`dkEaS  
 if(nHookCount>1){ w^vK7Z 1$  
  nHookCount--; *8(t y%5F0  
  return TRUE; TO8\4p*tE  
 } P7^TRrMF  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }pU!1GsO  
 if(unhooked==TRUE){ `^@g2c+d  
  nHookCount=0; 6 I>xd  
  hHook=NULL; h_}BmJh_  
 } ?7uStqa  
 return unhooked; KH CdO  
} M 2U@gC|{  
IT{.^rP  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z2Y583D  
{ wLg:YM"  
 BOOL bAdded=FALSE; V%Z[,C u+  
 for(int index=0;index<MAX_KEY;index++){ h3vm< R;  
  if(hCallWnd[index]==0){ 0L 4]z'5  
   hCallWnd[index]=hWnd; cUX]tiC0  
   HotKey[index]=cKey; =&<$I  
   HotKeyMask[index]=cMask; 1Rb<(%   
   bAdded=TRUE; N NXwT0t  
   KeyCount++; pu m9x)y1  
   break;  s`{#[&[  
  } {mq$W  
 } jTxChR  
 return bAdded; A/W7 ;D  
} J0Rz.=Y  
ps4Wwk(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B[k+#YYY  
{ AF{7<v>/P  
 BOOL bRemoved=FALSE; DdA}A>47  
 for(int index=0;index<MAX_KEY;index++){ q=L* 99S  
  if(hCallWnd[index]==hWnd){ \q)1 TTnHS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ znDtM1sLeV  
    hCallWnd[index]=NULL; rSFXchD/  
    HotKey[index]=0; ~dX@5+Gd  
    HotKeyMask[index]=0; NU 6Kh7  
    bRemoved=TRUE; 4N^Qd3[d  
    KeyCount--; :j50]zLy{  
    break; x%Y a*T  
   } DqC}f#  
  } `W;cft4  
 } \/e*quxx  
 return bRemoved; I@3c QxI  
} mk3e^,[A  
!n?*vN=S  
void VerifyWindow() 77[;J  
{ .]d tRH<  
 for(int i=0;i<MAX_KEY;i++){ y{},{~FA"  
  if(hCallWnd!=NULL){ I}CA-8  
   if(!IsWindow(hCallWnd)){ %0M^  
    hCallWnd=NULL; 5In8VE !P  
    HotKey=0; <38@b ]+  
    HotKeyMask=0; 7ump:|  
    KeyCount--; #j ~FA3O  
   } ]> "/<"  
  } R5~vmT5W  
 } ;ZW}47:BS6  
} >[3,qP]E  
88L bO(q\d  
BOOL CHookApp::InitInstance() OgpH{"  
{ zk_hDhg&'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~k< 31 ez  
 hins=AfxGetInstanceHandle(); E)Epr&9S  
 InitHotkey(); WoT z'  
 return CWinApp::InitInstance(); g5YsV p  
} _WkcJe`  
# ;KG6IE  
int CHookApp::ExitInstance() Nb, H8;  
{ &_x/Dzu!z  
 VerifyWindow(); !/lY q;$R  
 UnInit(); o_^d>Klb8  
 return CWinApp::ExitInstance(); af5`ktx  
} _=M'KCL*)  
*Zo o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 8$xKg3-3M  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) HC`3AQ12!&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,(Hmk(,  
#if _MSC_VER > 1000 !`Yi{}1_  
#pragma once 9Q5P7}%p  
#endif // _MSC_VER > 1000 Nk~dfY<s  
~;4k UJD  
class CCaptureDlg : public CDialog +W3>Yg%)X  
{ 5x'y{S<  
 // Construction 9%k.GE  
 public: OU5|m%CmO  
  BOOL bTray; P!&CH4+  
  BOOL bRegistered; .F$AmVTN  
  BOOL RegisterHotkey(); xW ZcSIH!  
  UCHAR cKey; 80" =Qu{s  
  UCHAR cMask; Br$PL&e~  
  void DeleteIcon(); u! FSXX<  
  void AddIcon(); )h!l%72  
  UINT nCount; Yt<PKs#E  
  void SaveBmp(); QKkr~?sTO  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor p?NjxQLA  
  // Dialog Data L/+J|_J)  
  //{{AFX_DATA(CCaptureDlg) ,^Srd20  
  enum { IDD = IDD_CAPTURE_DIALOG }; %H~gN9Vn#@  
  CComboBox m_Key; #.t{g8W\C  
  BOOL m_bControl; Y,"MQFr(o  
  BOOL m_bAlt; *U^hwL  
  BOOL m_bShift; *M<=K.*\G  
  CString m_Path; ]<?)(xz  
  CString m_Number; 1KR|i"  
  //}}AFX_DATA NS~knR\&  
  // ClassWizard generated virtual function overrides .qPfi] ty  
  //{{AFX_VIRTUAL(CCaptureDlg) nAC#_\  
 public: )GKgK;=~  
  virtual BOOL PreTranslateMessage(MSG* pMsg); s;M*5|-  
 protected: {mitF  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BfLZ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); j7 3@Yi%  
  //}}AFX_VIRTUAL PGhZ`nl  
  // Implementation !27]1%Aw  
 protected: U: jf9L2  
  HICON m_hIcon; h4i $z-!  
  // Generated message map functions ;i?!qB>baX  
  //{{AFX_MSG(CCaptureDlg) ?a9k5@s  
  virtual BOOL OnInitDialog(); D8{HOv;d^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); vaZZzv{H  
  afx_msg void OnPaint(); m =F@CA~C  
  afx_msg HCURSOR OnQueryDragIcon(); =eLb"7C#0  
  virtual void OnCancel(); OYy !4Fp  
  afx_msg void OnAbout(); 9o'6es..@Z  
  afx_msg void OnBrowse(); F7l:*r,O  
  afx_msg void OnChange(); .*7UT~o=CS  
 //}}AFX_MSG OIT;fKl9  
 DECLARE_MESSAGE_MAP() wdV?& W+  
}; B\&Ka<r  
#endif jch8d(`?d  
ay|{!MkQ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .4(f0RG  
#include "stdafx.h" *03/ :q^(  
#include "Capture.h" v('d H"Y  
#include "CaptureDlg.h" rB?cm]G=  
#include <windowsx.h> :vT%5CQ  
#pragma comment(lib,"hook.lib") 3) 0~:  
#ifdef _DEBUG D.!7jA#  
#define new DEBUG_NEW 04d$_1:}a  
#undef THIS_FILE EC&,0i4n:  
static char THIS_FILE[] = __FILE__; ;O11)u?/s|  
#endif u.FDe2|[)  
#define IDM_SHELL WM_USER+1 3:#rFb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mnj A8@1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); eF1%5;" W  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; XOU$3+8q5  
class CAboutDlg : public CDialog ]w_)Spo.  
{ =lD]sk  
 public: 34:EpZO@  
  CAboutDlg(); 0M98y!A 5^  
  // Dialog Data +eXfT*=u5  
  //{{AFX_DATA(CAboutDlg) 0Wm-` ZA  
  enum { IDD = IDD_ABOUTBOX }; S$WM&9U   
  //}}AFX_DATA gXJ^o;R>M  
  // ClassWizard generated virtual function overrides *b_54X%3  
  //{{AFX_VIRTUAL(CAboutDlg) ~`H<sJ?9  
 protected: &2igX?60  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9-6_:N>  
  //}}AFX_VIRTUAL -"H4brj;G  
  // Implementation  O+j:L  
 protected: :n9^:srGZH  
  //{{AFX_MSG(CAboutDlg) H\bIO!vb  
  //}}AFX_MSG ~ }22Dvo  
  DECLARE_MESSAGE_MAP() wm71,R1  
}; f|0QN#$  
4pT|r6!<  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nWu4HFi  
{ elgQcJ99  
 //{{AFX_DATA_INIT(CAboutDlg) `p|vutk)U  
 //}}AFX_DATA_INIT >#|Yoc  
} vDvGT<d  
^W'[l al.  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) j}l8k@f  
{ 3>Snd9Q  
 CDialog::DoDataExchange(pDX); %/zZ~WIf  
 //{{AFX_DATA_MAP(CAboutDlg) xvl  
 //}}AFX_DATA_MAP N@)~j+Pz  
} 2N 4>  
:5J6rj;_  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) E ET 2|*}  
 //{{AFX_MSG_MAP(CAboutDlg) V p{5Kxq  
 // No message handlers Y_sVe  
 //}}AFX_MSG_MAP ] '/]j  
END_MESSAGE_MAP() T_T{c+,Zd$  
zmRK%a(  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Am4(WXVQ  
: CDialog(CCaptureDlg::IDD, pParent) 2,0F8=L  
{ (=rv `1  
 //{{AFX_DATA_INIT(CCaptureDlg) x~eEaD5m%J  
  m_bControl = FALSE; $uhDBmb  
  m_bAlt = FALSE; YYW70k:  
  m_bShift = FALSE; aM!#  
  m_Path = _T("c:\\"); G - WJlu  
  m_Number = _T("0 picture captured."); I_7EfAqg(  
  nCount=0; It-*CD9  
  bRegistered=FALSE; LP /4e`  
  bTray=FALSE; fM.|#eLi  
 //}}AFX_DATA_INIT A!yLwkc:5  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ze)K-6SKH  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); IOl"Xgn5  
} Al}PJz\  
ze N!*VG  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) O]eJQ4XN<  
{ Mk?I}  
 CDialog::DoDataExchange(pDX); Lm#d.AD)  
 //{{AFX_DATA_MAP(CCaptureDlg) kELyD(^P`  
  DDX_Control(pDX, IDC_KEY, m_Key); or`stBx  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |'_<(z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); [rU8 #4.  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 89mre;v`  
  DDX_Text(pDX, IDC_PATH, m_Path); )n@3@NV  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @un }&URp  
 //}}AFX_DATA_MAP 2"mj=}y6  
} Ms)zEy>[Ql  
F9r*ZyNlx  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vy2aNUmt  
//{{AFX_MSG_MAP(CCaptureDlg) ZQA C &:  
 ON_WM_SYSCOMMAND() 5&= n  
 ON_WM_PAINT() m28w4   
 ON_WM_QUERYDRAGICON() p>3'77 V  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) mC(t;{  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) U:hC! t:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) " SqKS,J  
//}}AFX_MSG_MAP }j*/>m  
END_MESSAGE_MAP() :j4 [_9\  
p5VSSvV\K  
BOOL CCaptureDlg::OnInitDialog() u_=y,~s  
{ kZ%W?#  
 CDialog::OnInitDialog(); %tQ{Hf~  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ZH_4'm!^g|  
 ASSERT(IDM_ABOUTBOX < 0xF000); f om"8iL1  
 CMenu* pSysMenu = GetSystemMenu(FALSE); mXj Ljgc}  
 if (pSysMenu != NULL) ;NeEgqW "  
 { !5!$h` g  
  CString strAboutMenu; t'x:fO?cp  
  strAboutMenu.LoadString(IDS_ABOUTBOX);  o f  
  if (!strAboutMenu.IsEmpty()) DNBpIC5&6  
  { 'PYqp&gJ  
   pSysMenu->AppendMenu(MF_SEPARATOR); w8I&:"^7<  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); |9Ks13?Ck  
  } dvF48,kr  
 } n ]}2O 4j  
 SetIcon(m_hIcon, TRUE); // Set big icon ?<^AXLiKV  
 SetIcon(m_hIcon, FALSE); // Set small icon ?I#hrv@  
 m_Key.SetCurSel(0);  WPKTX,k  
 RegisterHotkey(); @6'E8NFl  
 CMenu* pMenu=GetSystemMenu(FALSE);  j)6B^!  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); n3j h\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *r$.1nke  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); +Z2<spqG  
 return TRUE; // return TRUE unless you set the focus to a control KXCmCn  
} Q9tE^d+%  
qFbUM;  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;o459L>sW  
{ w1(06A}/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) v} ;qMceJ  
 { X$Vz  
  CAboutDlg dlgAbout; Go7hDmu  
  dlgAbout.DoModal(); 5?0gC&WfN  
 } aZGDtzNG5h  
 else ) '`AX\  
 { f<p4Pkv  
  CDialog::OnSysCommand(nID, lParam); <>Ddxmw  
 } `h5eej&s(  
} L#q9_-(#  
x`vs-Y:P  
void CCaptureDlg::OnPaint() : ";D.{||  
{ ~7WXjVZ  
 if (IsIconic()) #ic 2ofI  
 { g~:(EO(w  
  CPaintDC dc(this); // device context for painting e4%*I8 ^e  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); e`M]ZG rr  
  // Center icon in client rectangle 9Ru%E>el-  
  int cxIcon = GetSystemMetrics(SM_CXICON); 9|A-oS  
  int cyIcon = GetSystemMetrics(SM_CYICON); &ntP~!w  
  CRect rect; 13_~)V  
  GetClientRect(&rect); bRz^=  
  int x = (rect.Width() - cxIcon + 1) / 2; RXS|-_$  
  int y = (rect.Height() - cyIcon + 1) / 2; sxwW9_C  
  // Draw the icon _Ge^ -7  
  dc.DrawIcon(x, y, m_hIcon); (,c?}TP  
 } Q1\k`J  
 else )-:eQ{st`  
 { ;VlZd*M?  
  CDialog::OnPaint(); lc?mKW9  
 } pQ^,.[[  
} vcJb\LW  
'EET3R K-S  
HCURSOR CCaptureDlg::OnQueryDragIcon() PeUd  
{ 39aCwhh7v  
 return (HCURSOR) m_hIcon; C2=iZ`Z>T  
} rspoSPnY1  
3kqV_Pjg  
void CCaptureDlg::OnCancel() <*Kh=v  
{ t^_{5  
 if(bTray) \i;&@Kp.N  
  DeleteIcon(); 6`baQ!xc.  
  CDialog::OnCancel(); 6Vbv$ AU  
} >{qK ]xj  
0 ij~e<  
void CCaptureDlg::OnAbout() V*7Z,nA  
{ rjAkpAT  
 CAboutDlg dlg; Xm=^\K3  
 dlg.DoModal(); ngY+Ym  
} &*]{"^  
cov#Z ux  
void CCaptureDlg::OnBrowse() >yA,@%X  
{ Ie&b <k  
 CString str; +fP/|A8P  
 BROWSEINFO bi; v;bP8)mI  
 char name[MAX_PATH]; 3ES[ N.V#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); jo;uRl  
 bi.hwndOwner=GetSafeHwnd(); ZG/8Ds  
 bi.pszDisplayName=name; ]%<Q:+38  
 bi.lpszTitle="Select folder"; &e]]F#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2~&hstd%  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); /q"d`!h)w  
 if(idl==NULL) sE%<"h\_0  
  return; }L$Xb2^l  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 0fPHh>u  
 str.ReleaseBuffer(); ,8=`*  
 m_Path=str; yw* mA1v  
 if(str.GetAt(str.GetLength()-1)!='\\') &<w[4z\  
  m_Path+="\\"; f*T)*R_  
 UpdateData(FALSE); Y( $Ji12  
} Y!= k  
29iIG 'N  
void CCaptureDlg::SaveBmp() gF,[u  
{ !&a;P,_Fb  
 CDC dc; yXTK(<'  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); -q&7J' N  
 CBitmap bm; "0H56#eW  
 int Width=GetSystemMetrics(SM_CXSCREEN); oWx_O-_._  
 int Height=GetSystemMetrics(SM_CYSCREEN); R7B,Q(q2-  
 bm.CreateCompatibleBitmap(&dc,Width,Height); bQdSX8: !R  
 CDC tdc; 5Q$r@&qp  
 tdc.CreateCompatibleDC(&dc); KM6N'x^z  
 CBitmap*pOld=tdc.SelectObject(&bm); Y1fy2\<'  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); @ k+%y'Y?  
 tdc.SelectObject(pOld); q M_/  
 BITMAP btm; .A*VLF*m  
 bm.GetBitmap(&btm); oGJ*Rn)Z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; W%>i$:Qq  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,5\2C{  
 BITMAPINFOHEADER bih; eg2U+g4  
 bih.biBitCount=btm.bmBitsPixel; +=6RmId+X  
 bih.biClrImportant=0; 4z9#M;q T  
 bih.biClrUsed=0; c:llOHA  
 bih.biCompression=0; =CjNtD2]  
 bih.biHeight=btm.bmHeight; &}nBenYp  
 bih.biPlanes=1; YXX36  
 bih.biSize=sizeof(BITMAPINFOHEADER); J+71FP`ZH  
 bih.biSizeImage=size; &SjHrOG?  
 bih.biWidth=btm.bmWidth; .|-l+   
 bih.biXPelsPerMeter=0; hg?j)jl|  
 bih.biYPelsPerMeter=0; <}EV*`w4  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); B?;' lDz*  
 static int filecount=0; -Wlp=#9  
 CString name; ]>)u+|  
 name.Format("pict%04d.bmp",filecount++); C(V[wvL  
 name=m_Path+name; ~[| V3h4v  
 BITMAPFILEHEADER bfh; Xq,UV  
 bfh.bfReserved1=bfh.bfReserved2=0; BKC7kDK3H  
 bfh.bfType=((WORD)('M'<< 8)|'B'); <?LfOSdMs^  
 bfh.bfSize=54+size; 4fw1_pv_D  
 bfh.bfOffBits=54; @e! Zc3  
 CFile bf; xb9Pc.A[  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ &o*s !u  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); &c!j`86y*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @K$VV^wp  
  bf.WriteHuge(lpData,size); %@lV-(5q  
  bf.Close(); Lj&1K~U  
  nCount++; n5Nan  
 } :!JpP R5  
 GlobalFreePtr(lpData); ]6t]m2~\  
 if(nCount==1) k_D4'(V:b  
  m_Number.Format("%d picture captured.",nCount); 4<G?  
 else 7Wwp )D  
  m_Number.Format("%d pictures captured.",nCount); ~A`&/U  
  UpdateData(FALSE); HzRX$IKB3(  
} O{k89{  
[=F>#8=  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) W.,% 0cZ  
{ R^J.?>0  
 if(pMsg -> message == WM_KEYDOWN) t&GA6ML#s  
 { 9VoDhsKk  
  if(pMsg -> wParam == VK_ESCAPE) YgE]d?_h  
   return TRUE; 4M @ oj  
  if(pMsg -> wParam == VK_RETURN) ]d@^i)2LF  
   return TRUE; V_&GYXx(J  
 } Zm%VG(l  
 return CDialog::PreTranslateMessage(pMsg); kmm  
} E rop9T1  
I1Hw"G"&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) FI]P<)*r  
{ 1~}m.ER  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _:35d1[  
  SaveBmp(); 1)TK01R8  
  return FALSE; x9&-(kBU  
} ]\ CU9J|H8  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ T4OguP=  
 CMenu pop; )Y3EQxXa  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ([:]T$0 #  
 CMenu*pMenu=pop.GetSubMenu(0); t"<s}~  
 pMenu->SetDefaultItem(ID_EXITICON); I jZ]_*^!  
 CPoint pt; $_Y/'IN`k  
 GetCursorPos(&pt); J=I:T2bV&s  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); WnD^F>  
 if(id==ID_EXITICON) @S`$C  
  DeleteIcon(); m7$8k@r  
 else if(id==ID_EXIT) A2m_q>> !  
  OnCancel(); ^"3\iA:  
 return FALSE; wL4Z W8_  
} 2R^O,Vu*W  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); s %eyW _  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0B=[80K;8  
 AddIcon(); aSc{Ft/O  
 return res; 9YR]+*  
} P DRnW  
T}C2e! _O  
void CCaptureDlg::AddIcon() 7#QLtU  
{ OnZF6yfN=3  
 NOTIFYICONDATA data; LmP qLH'(Q  
 data.cbSize=sizeof(NOTIFYICONDATA); q5Fs)B  
 CString tip; YiD-F7hf.*  
 tip.LoadString(IDS_ICONTIP); ]JOephX2R  
 data.hIcon=GetIcon(0); k*5'L<&  
 data.hWnd=GetSafeHwnd(); "mP&8y 9F  
 strcpy(data.szTip,tip); h}<0/  
 data.uCallbackMessage=IDM_SHELL; Aj [?aL  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; sU\c#|BSC"  
 data.uID=98; x&'o ]Y  
 Shell_NotifyIcon(NIM_ADD,&data); M'kVL0p?vN  
 ShowWindow(SW_HIDE); b9!.-^<8y  
 bTray=TRUE; <3d;1o   
} Mr-DGLJ  
6yY.!HRkr  
void CCaptureDlg::DeleteIcon() BR+nL6sU  
{ i=YXKe6fD  
 NOTIFYICONDATA data; Bd{4Ae\_+g  
 data.cbSize=sizeof(NOTIFYICONDATA); ]1m"V;vZ  
 data.hWnd=GetSafeHwnd(); ).LTts7c  
 data.uID=98; lWW+5  
 Shell_NotifyIcon(NIM_DELETE,&data); CJJD@=  
 ShowWindow(SW_SHOW); wMGk!N  
 SetForegroundWindow(); O7%2v@j|8  
 ShowWindow(SW_SHOWNORMAL); >*IN  
 bTray=FALSE; rah,dVE]  
} }.p<wCPy6  
+ :Vrip  
void CCaptureDlg::OnChange()  >1A*MP4  
{ OA[&Za#w  
 RegisterHotkey(); P}0*{%jB  
} F*M|<E=  
moMYdArj  
BOOL CCaptureDlg::RegisterHotkey() L'l F/qe^  
{ #/|75 4]]  
 UpdateData(); zrs<#8!Y_!  
 UCHAR mask=0; d{f@K71*  
 UCHAR key=0; -T7%dLHY  
 if(m_bControl) [QT 1Ju64  
  mask|=4; Wt^|BjbB4  
 if(m_bAlt) -_NC%iN#C  
  mask|=2; =VNSi K>F  
 if(m_bShift) l[ne/O JJ  
  mask|=1; Ir5WN_EaS  
  key=Key_Table[m_Key.GetCurSel()]; %JtbRs(~q  
 if(bRegistered){ mLwoi!]m  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Z?oG*G:  
  bRegistered=FALSE; TI=h_%mO  
 } QYQtMb,  
 cMask=mask; #O~XVuvF0  
 cKey=key; yPV' pT)  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); P-CB;\  
 return bRegistered; . V$ps-t  
} ~]BMrgn  
ZsZcQj6G,  
  四、小结 BYi)j6"  
UNDi_6Dy   
  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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