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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: R-\a3q  
  W!.vP~>  
  一、实现方法 x.ZW%P1  
$lYy`OuC  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: q o^PS  
X6`F<H`  
#pragma data_seg("shareddata") /6@iRswa  
HHOOK hHook =NULL; //钩子句柄 pZUXXX  
UINT nHookCount =0; //挂接的程序数目 AIK99  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 "z/)> ?Wn  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .{}=!>U2  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey h:qt?$]J  
static int KeyCount =0; %hM8px4d  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 |2'u@<(Z/  
#pragma data_seg() q` Z_Bw  
DE659=Tq  
  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。 h|Z%b_a  
/%4wm?(eA  
  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: E!_mXjlPc  
g(`m#&P>G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Q^c)T>OAI  
cKey,UCHAR cMask) }>T$2"pf  
{ R_ |Sg  
 BOOL bAdded=FALSE; a"6AZT"8  
 for(int index=0;index<MAX_KEY;index++){ r iuG,$EX  
  if(hCallWnd[index]==0){ zJ9[),;7B  
   hCallWnd[index]=hWnd; :#I7);ol  
   HotKey[index]=cKey; kafRuO~$  
   HotKeyMask[index]=cMask; 40ZHDtIu<  
   bAdded=TRUE; QhqXd  
   KeyCount++; W7 iml|WV0  
   break; |gP9^B?3  
  } Hvj1R.I/  
 } R<-u`uX nP  
 return bAdded; pA|Z%aL  
} 45+w)Vf!  
//删除热键 #Y9'n0 AL  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ZA>p~Zt  
{ Y  c]  
 BOOL bRemoved=FALSE; n>|7 k3  
 for(int index=0;index<MAX_KEY;index++){ KOqp@K$  
  if(hCallWnd[index]==hWnd){ qC;1ND  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]u\K}n6[q  
    hCallWnd[index]=NULL; q[rBu9  
    HotKey[index]=0; `~ ,  
    HotKeyMask[index]=0; 14LOeo5O  
    bRemoved=TRUE; iJH;OV;P  
    KeyCount--; .PHz   
    break; Frxim  
   } A3jT;D9Y%  
  } BEfp3|Stb  
 } .NOh[68'  
 return bRemoved; kl&9M!;:n  
} b{WEux{)  
Gs7#W:e7  
]`S35b  
  DLL中的钩子函数如下: 7 g2@RKo  
9"%ot=)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [ S_8;j  
{ T+9#&  
 BOOL bProcessed=FALSE; `EjPy>kM  
 if(HC_ACTION==nCode) _h2s(u >\  
 { gXzp$#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 :fW\!o 8Z2  
   switch(wParam) GLIe8T*ht  
   {  N9s ,..  
    case VK_MENU: 2S`D7R#6s  
     MaskBits&=~ALTBIT; vI)-Zz[3  
     break; B)1.CHV%<  
    case VK_CONTROL: bF#1'W&  
     MaskBits&=~CTRLBIT; )X dpzWod  
     break; }>|!Mf]W?R  
    case VK_SHIFT: beN(7jo  
     MaskBits&=~SHIFTBIT; 9~FB^3Nz_  
     break; [p7cgHSMt  
    default: //judge the key and send message }RT#V8oc  
     break; .JG>/+  
   } FSp57W$  
   for(int index=0;index<MAX_KEY;index++){ x9&{@ ?o  
    if(hCallWnd[index]==NULL) :^Ouv1!e1  
     continue; TAl#V 7PF}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E$w2S Q  
    { 9iWs'M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); k&kx%skz  
     bProcessed=TRUE; uk\-"dS  
    } Gx.iZOOH/  
   } 9sR?aW^$,/  
  } mV58&SZT  
  else if((lParam&0xc000ffff)==1){ //有键按下 :Jz@`s1n  
   switch(wParam) AzwG_XgM)  
   { ML|O2e  
    case VK_MENU: pP`KI'aUN  
     MaskBits|=ALTBIT; ^9g+\W  
     break; ;g M$%!&  
    case VK_CONTROL: sdWu6?B_  
     MaskBits|=CTRLBIT; :mpR}.^hv  
     break; [nBdq"K  
    case VK_SHIFT: !x, ;&  
     MaskBits|=SHIFTBIT; /<\B8^yQ  
     break; tCw.wDq3=  
    default: //judge the key and send message 6N^sUc0s  
     break; Gxj3/&]^Y  
   } $G_,$U !  
   for(int index=0;index<MAX_KEY;index++){ HalkNR-eEm  
    if(hCallWnd[index]==NULL) IQz:D J  
     continue; +/L "A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z 5T_  
    { x-Cy,d:YX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l_Ffbs_6t  
     bProcessed=TRUE; D8b~-#  
    } DV,rh83.ip  
   } &;D(VdSr9  
  } @n-[bN  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 W)0y+H\% r  
   for(int index=0;index<MAX_KEY;index++){ ?\eq!bu  
    if(hCallWnd[index]==NULL) v@8 =u4  
     continue; n<. T6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]B;\?Tim  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `9+>2*k  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2L'vB1 `  
   } wGXnS"L!  
  } @L)=epC  
 } e>:bV7h j~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); c2,1d`  
} ^YpA@`n  
:4ndU:.L  
  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: k>N >_{\  
-]uN16\ F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?&H1C4   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); T vEN0RV2  
(Nky?*  
  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: +:s]>R eDa  
'_~X(izc  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) XuQ7nlbnq  
{ KvFGwq"X  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) UP@a ?w  
 { sw(dd01a 7  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :[#~,TW  
  SaveBmp(); }P5zf$  
  return FALSE; _>G=v!  
 } w_gPX0N}3n  
 …… //其它处理及默认处理 !_EaF`oh(  
} i&r56m<  
3E!#?N|v  
XYKWOrkQqa  
  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。 X>n\@rTo  
B"-gK20vY  
  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。 :uAW  
GS%i<HQ3  
  二、编程步骤 ,@_$acm  
L=. 4x=%%  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ?a h<Qf]  
=ZsM[wd  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; MZ(TST"  
q+MV@8w  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;  M>mk=-l  
'wo[iNy[  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; b9ON[qOMN  
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  5、 添加代码,编译运行程序。 Jl"),;Od  
blwdcdh  
三、程序代码 o8:K6y  
c !$ 8>  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL -XVC,.Ly  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) hSgfp  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ZWC-<QO"<  
#if _MSC_VER > 1000 6,"fH{Bd  
#pragma once ^lqcF.  
#endif // _MSC_VER > 1000 }`oe<|  
#ifndef __AFXWIN_H__ [TZlvX(E  
#error include 'stdafx.h' before including this file for PCH Xwg|fr+p  
#endif FkdG@7Xf  
#include "resource.h" // main symbols @quNVx(y  
class CHookApp : public CWinApp 58H[sM4>  
{ ^y?7B_%:B#  
 public: wff&ci28  
  CHookApp(); $B6"fYiDk  
  // Overrides k,L,  
  // ClassWizard generated virtual function overrides uC3o@qGW<  
  //{{AFX_VIRTUAL(CHookApp)  [69[Ct  
 public: oKIry 8'^N  
  virtual BOOL InitInstance(); ; &2J9  
  virtual int ExitInstance(); n7 RswX  
  //}}AFX_VIRTUAL `?P k~7  
  //{{AFX_MSG(CHookApp) Y$%/H"1bk  
  // NOTE - the ClassWizard will add and remove member functions here. *E<%db C2  
  // DO NOT EDIT what you see in these blocks of generated code ! Ni$WI{e9  
  //}}AFX_MSG YfC1.8  
  DECLARE_MESSAGE_MAP() xw*T? !r=V  
}; _P!J0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); `.z;.&x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rp sq.n   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8&6h()  
BOOL InitHotkey(); S~\i"A)4  
BOOL UnInit(); ."R,j|o6  
#endif $73j*@EQA  
>EFjyhVE  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. / r#.BXP  
#include "stdafx.h" sXzxEhp  
#include "hook.h" h1.]Nl C  
#include <windowsx.h> `~Eo;'(+^  
#ifdef _DEBUG Le9^,B@Pb  
#define new DEBUG_NEW m*L*# ZBS  
#undef THIS_FILE *P_ 3A:_  
static char THIS_FILE[] = __FILE__; r5qp[Ss3F  
#endif NymS8hxR  
#define MAX_KEY 100 =J0X{Ovn4z  
#define CTRLBIT 0x04 )bZS0f-  
#define ALTBIT 0x02 Y`S9mGR#  
#define SHIFTBIT 0x01 'CT 8vt;  
#pragma data_seg("shareddata") ^l#Z*0@><~  
HHOOK hHook =NULL; #vi `2F  
UINT nHookCount =0; RVv@x5  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey TIg 3'au  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT od{b]HvgS  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey LL5n{#)N  
static int KeyCount =0; X>w(^L*>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ':8yp|A|  
#pragma data_seg() ,K Ebnk|i  
HINSTANCE hins;  Z(p kj  
void VerifyWindow(); &B uO-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) SxLu<  
//{{AFX_MSG_MAP(CHookApp) gc-yUH0I  
// NOTE - the ClassWizard will add and remove mapping macros here. o5gt`H"  
// DO NOT EDIT what you see in these blocks of generated code! -W(O~AK  
//}}AFX_MSG_MAP 1 dT1DcZ  
END_MESSAGE_MAP() n?*Fr sZ  
"nX L7N0  
CHookApp::CHookApp() MXY[t  
{ d\}r.pD  
 // TODO: add construction code here, 'qS&7 W(  
 // Place all significant initialization in InitInstance 3]BK*OqJ  
} XVjs0/5b  
'~ RP+  
CHookApp theApp; DfP4 `  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) umrfA  
{ Bk&ry)`gD  
 BOOL bProcessed=FALSE; Q=lQy  
 if(HC_ACTION==nCode) w,dDA2,  
 { ^9zL[R  
  if((lParam&0xc0000000)==0xc0000000){// Key up  V3WHp'1  
   switch(wParam) 1BK-uv:  
   { ^ZX71-  
    case VK_MENU: H: Rd4dl,  
     MaskBits&=~ALTBIT; mG2*s ^$  
     break; 1.YDIB||  
    case VK_CONTROL: <zE,T@c  
     MaskBits&=~CTRLBIT; >K$9 (  
     break; won;tO]\;@  
    case VK_SHIFT: m @) ~.E  
     MaskBits&=~SHIFTBIT; s/+@o:  
     break; [(U:1&x &  
    default: //judge the key and send message X>^St&B}fC  
     break; H%`Ja('"p  
   } ;^nN!KDjR  
   for(int index=0;index<MAX_KEY;index++){ /k3v\Jq{  
    if(hCallWnd[index]==NULL) F$P8"q+  
     continue; W'w;cy:H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1w}%>e-S  
    { 5q<AMg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); a#t:+iw  
     bProcessed=TRUE; ].=&^0cg  
    } s86Ij>VLf  
   } &U%AVD[  
  } ?s[ kUv+=  
  else if((lParam&0xc000ffff)==1){ //Key down uc]]zI6  
   switch(wParam) Vo^ i7  
   { Pu dIb|V2  
    case VK_MENU: /?<o?IR~6  
     MaskBits|=ALTBIT; H'E(gc)>)  
     break; .$5QM&  
    case VK_CONTROL: Coz\fL  
     MaskBits|=CTRLBIT; s Wk92x _l  
     break; b6sj/V8  
    case VK_SHIFT: 7M*&^P\}es  
     MaskBits|=SHIFTBIT; K[JbQ30  
     break; 5 s3!{zT{  
    default: //judge the key and send message 5[3vu p?  
     break; a"gZw9m@  
   } WPT0=Hqp7  
   for(int index=0;index<MAX_KEY;index++) 'E FP/(2J  
   { . _j9^Ll  
    if(hCallWnd[index]==NULL) k@MAi*  
     continue; x"q!=&>f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z _W.iBF  
    { ^$-ID6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ` 6a  
     bProcessed=TRUE; b_2bg>|;  
    } NuZiLtC  
   } H&`0I$8m  
  } fz'@ON  
  if(!bProcessed){ cKt=_4Lf  
   for(int index=0;index<MAX_KEY;index++){ 7M;7jI/C  
    if(hCallWnd[index]==NULL) D4nYyj1O3  
     continue; 8,unq3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JB.f7-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); M?mPi 3  
   } M4[(.8iE  
  } ,@1rP55  
 } !Au'WJfE  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [?z`XY_-  
} 6U|An*  
T%|{Qo<j  
BOOL InitHotkey() IiW*'0H:/  
{ XS+2OutVo  
 if(hHook!=NULL){ E Dh$UB)  
  nHookCount++; r]JV !'R  
  return TRUE; yOHVL~F  
 } i+rh&,  
 else oPP`)b$x  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); G`1!SEae  
  if(hHook!=NULL) 66ULR&D8  
   nHookCount++; M&auA  
  return (hHook!=NULL); fCC^hB]'  
} H,8HGL[l  
BOOL UnInit() X0a)6HZ{  
{ 8SH&b8k<<  
 if(nHookCount>1){ ?r P'PUB  
  nHookCount--; +d/V^ <#  
  return TRUE; H!N`hEEj>  
 } m5i?<Ko@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 'x/pV5[hQ  
 if(unhooked==TRUE){ KV&4Ep#  
  nHookCount=0; 7dxTyn=  
  hHook=NULL; zsM3 [2E*  
 } D@.+B`bA  
 return unhooked; ;W"=s79  
} T$ w`=7  
))M!"*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8NP|>uaj  
{ i`k{}!F  
 BOOL bAdded=FALSE; E~]37!,\\9  
 for(int index=0;index<MAX_KEY;index++){ k5M3g*  
  if(hCallWnd[index]==0){ :c03"jvYE  
   hCallWnd[index]=hWnd; _=Y?' gHH  
   HotKey[index]=cKey; mf4C68DI@u  
   HotKeyMask[index]=cMask; N{kp^Byim0  
   bAdded=TRUE; jimWLF5Q5"  
   KeyCount++; &Ul8h,qw  
   break; o/dj1a~U  
  } y}5:CZ  
 } ULT,>S6r  
 return bAdded; t[=-4;  
} y6#AL<W@=  
dMw7UJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) xlKg0 &D  
{ mCb1^Y  
 BOOL bRemoved=FALSE; J_-K"T|f  
 for(int index=0;index<MAX_KEY;index++){ {KQ]"a 6  
  if(hCallWnd[index]==hWnd){ 85e!)I_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $0[t<4K`yn  
    hCallWnd[index]=NULL; #{f%b,.yxt  
    HotKey[index]=0; bX*>Zm   
    HotKeyMask[index]=0; a8w/#!^34  
    bRemoved=TRUE; PNgdWf3  
    KeyCount--; S:= _o  
    break; !_i;6UVG  
   } QZZt9rA;  
  } 5Z]]xR[  
 } 6B8g MO  
 return bRemoved; &m5FYm\  
} ^}Wk  
yiO/0nMp  
void VerifyWindow() +H**VdM6s  
{ %3kS;AaA  
 for(int i=0;i<MAX_KEY;i++){ Y[~Dj@Q<  
  if(hCallWnd!=NULL){ zm~sq_=^  
   if(!IsWindow(hCallWnd)){ %mFZ!(  
    hCallWnd=NULL; "h\ (a<  
    HotKey=0; +eUWf{(_  
    HotKeyMask=0; Bx" eX>A8  
    KeyCount--; (qyT,K8  
   } u%24% Q  
  } Rlwewxmr  
 } G2 {R5F !  
} >{1 i8 b@  
SoJ=[5W  
BOOL CHookApp::InitInstance() (8Inf_59  
{ EK 8rV  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); k1_" }B5  
 hins=AfxGetInstanceHandle(); N+nv#]{  
 InitHotkey(); VRQD  
 return CWinApp::InitInstance(); hVGK%HCz&  
} @9AK!I8f  
]1)#Y   
int CHookApp::ExitInstance() )RCva3Ul  
{ yM PZ}  
 VerifyWindow(); opIbs7k-  
 UnInit(); w l#jSj%pd  
 return CWinApp::ExitInstance(); {b,#l]v  
} (k$KUP  
Cj5=UUnO  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Qz4n%|  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {oVoN>gp  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Qj3l>O  
#if _MSC_VER > 1000 8{B]_: -:  
#pragma once U UYx-x  
#endif // _MSC_VER > 1000 f?BApm  
N= G!r  
class CCaptureDlg : public CDialog qA>C<NL  
{ ?' /#Gt`  
 // Construction M{)|9F  
 public: Dd' 4W  
  BOOL bTray; lU8X{SV!  
  BOOL bRegistered; N_o|2  
  BOOL RegisterHotkey(); u5I#5  
  UCHAR cKey; Q&`if O  
  UCHAR cMask; Vg^,Ky,  
  void DeleteIcon(); 1zGhX]z  
  void AddIcon(); m#|h22^H  
  UINT nCount; /VHQ!Wi  
  void SaveBmp(); 4NDT5sL  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor shuoEeoo  
  // Dialog Data r"$~Gg.%(  
  //{{AFX_DATA(CCaptureDlg) kJNu2S  
  enum { IDD = IDD_CAPTURE_DIALOG }; c.{t +OR  
  CComboBox m_Key; j|w_BO 9  
  BOOL m_bControl; L IN$Y  
  BOOL m_bAlt; \F8 :6-  
  BOOL m_bShift; W8N__  
  CString m_Path; :Oh*Q(>  
  CString m_Number; (X/dP ~  
  //}}AFX_DATA 2*pNIc  
  // ClassWizard generated virtual function overrides *}RV)0mif  
  //{{AFX_VIRTUAL(CCaptureDlg) COFCa&m9c  
 public: YDjjhe+  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ['_W <  
 protected:  CT[CM+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support P.W@5:sD  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); V2o1~R~  
  //}}AFX_VIRTUAL 58[.]f~0  
  // Implementation zOn% \  
 protected: d 6=Z=4w  
  HICON m_hIcon; <o: O<p@6  
  // Generated message map functions Xu%8Q?]  
  //{{AFX_MSG(CCaptureDlg) a+ s%9l  
  virtual BOOL OnInitDialog(); $^5c8wT  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); bOdQ+Y6  
  afx_msg void OnPaint(); HSlAm&Y\  
  afx_msg HCURSOR OnQueryDragIcon(); I;UCKoFT  
  virtual void OnCancel(); I'c rH/z9  
  afx_msg void OnAbout(); H]PEE!C;xC  
  afx_msg void OnBrowse(); 4O '%$6KR(  
  afx_msg void OnChange(); ,jJbQIu#  
 //}}AFX_MSG 19*D*dkBR  
 DECLARE_MESSAGE_MAP() @XN*H- |  
}; (dHil#l  
#endif 4Ixu%  
6g 5Lf)yG  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file v{O(}@  
#include "stdafx.h" &H:2TL!  
#include "Capture.h" k{E!X  
#include "CaptureDlg.h" DgGG*OXY  
#include <windowsx.h> EeDK ^W8N  
#pragma comment(lib,"hook.lib") qMmhVUx  
#ifdef _DEBUG tE]Y=x[Ux  
#define new DEBUG_NEW .*{0[  
#undef THIS_FILE OY,iz  
static char THIS_FILE[] = __FILE__; >*"1`vcxF  
#endif S&{#sl#e  
#define IDM_SHELL WM_USER+1 AI9#\$aGV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @%gth@8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k[8{N  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; C7_nA:Rc  
class CAboutDlg : public CDialog |`Q2K9'4bL  
{ dH~i  
 public: W3y9>]{x^  
  CAboutDlg(); [_1K1i"m  
  // Dialog Data IaYaIEL-  
  //{{AFX_DATA(CAboutDlg) t3b64J[A{  
  enum { IDD = IDD_ABOUTBOX }; [sF z ;Py]  
  //}}AFX_DATA NL76 jF  
  // ClassWizard generated virtual function overrides |wYOO(!  
  //{{AFX_VIRTUAL(CAboutDlg) B^C!UWN>%X  
 protected: Am&PH(}L  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?.%'[n>P  
  //}}AFX_VIRTUAL f+o%N  
  // Implementation B[Gl}(E  
 protected: Ebk_(Py\  
  //{{AFX_MSG(CAboutDlg) 5l ioL)  
  //}}AFX_MSG P.Uz[_&l6  
  DECLARE_MESSAGE_MAP() ck"lX[d1  
}; WUnmUW[/  
f#3U,n8:  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) aHzS>  
{ R]y[n;aGC  
 //{{AFX_DATA_INIT(CAboutDlg) 2A^>>Q/,u  
 //}}AFX_DATA_INIT \vR&-+8dk  
} +o94w^'^$b  
Z F&aV?  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3xU in  
{ Mw,7+  
 CDialog::DoDataExchange(pDX); `NNr]__  
 //{{AFX_DATA_MAP(CAboutDlg) Mc #w:UH[  
 //}}AFX_DATA_MAP .tny"a&  
} 4?s ~S. %  
M]JD(  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) zLB7'7oP  
 //{{AFX_MSG_MAP(CAboutDlg) X\dPQwasM  
 // No message handlers 7Ne`F(c  
 //}}AFX_MSG_MAP 4?3*%_bDJ,  
END_MESSAGE_MAP() 2G9sKg,kL  
? h*Ngbj>  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) LQs>[3rK  
: CDialog(CCaptureDlg::IDD, pParent) %1Pn;bUU!  
{ !L)~*!+Gf  
 //{{AFX_DATA_INIT(CCaptureDlg) as%ab[ fX  
  m_bControl = FALSE; ZI8*PX%2  
  m_bAlt = FALSE; OE4hG xG  
  m_bShift = FALSE; SK @%r  
  m_Path = _T("c:\\"); <E`Ygac  
  m_Number = _T("0 picture captured."); ,(  ?q  
  nCount=0; I2R" Y<  
  bRegistered=FALSE; n M?mdb  
  bTray=FALSE; HpD<NVu  
 //}}AFX_DATA_INIT A_mVe\(*M  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $aFCe}3b<  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~)kOO oH  
} r- :u*  
8LMO2Wyq  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) uIO<6p)  
{ }{(dG7G+  
 CDialog::DoDataExchange(pDX); 1oSrhUTy  
 //{{AFX_DATA_MAP(CCaptureDlg) $%3"@$  
  DDX_Control(pDX, IDC_KEY, m_Key); JQt Bt2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); tf5h/:  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {M.OOEcIp  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); rrSsQq  
  DDX_Text(pDX, IDC_PATH, m_Path); os3jpFeG'  
  DDX_Text(pDX, IDC_NUMBER, m_Number); jBO/1h=  
 //}}AFX_DATA_MAP ,+gU^dc|hq  
} D V  
!ibdw_H  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *h `P+_Q7  
//{{AFX_MSG_MAP(CCaptureDlg) 88GS Bg:YH  
 ON_WM_SYSCOMMAND() z!<X{& e  
 ON_WM_PAINT() 0"vI6Lm  
 ON_WM_QUERYDRAGICON() %}nNwuJ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) A=(<g";m  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 'fqX^v5n  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *x;&fyR  
//}}AFX_MSG_MAP +@ FM~q  
END_MESSAGE_MAP() ]hPu  
Ig sK7wn  
BOOL CCaptureDlg::OnInitDialog() ^bZ'z  
{ [K\Vc9  
 CDialog::OnInitDialog(); Lcx)wof  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); j<HBzqP%6  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7l%]/`Y-  
 CMenu* pSysMenu = GetSystemMenu(FALSE); a%"27 n(M  
 if (pSysMenu != NULL) 8{t^< j$n  
 { J ^y1=PM  
  CString strAboutMenu; ~q.a<B`,t  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 9uNkd2 #  
  if (!strAboutMenu.IsEmpty()) kma)DW  
  { /5l"rni   
   pSysMenu->AppendMenu(MF_SEPARATOR); ZJ$nHS?ra  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;!ICLkc$  
  } DaN=NURDV  
 } 4DYa~ =w  
 SetIcon(m_hIcon, TRUE); // Set big icon KXQ &u{[<  
 SetIcon(m_hIcon, FALSE); // Set small icon 7j ]d{lD  
 m_Key.SetCurSel(0); %]2hxTV  
 RegisterHotkey(); t 8}R?%u  
 CMenu* pMenu=GetSystemMenu(FALSE); r\+0J`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6dCS Gb  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /3VSO"kcZ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); mO6rj=L^  
 return TRUE; // return TRUE unless you set the focus to a control CTG:C5OK  
} ~`uEZ  
C3XB'CL6  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [%);N\o2Y  
{ P0B`H7D  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) v/fo`]zP  
 { TQ{rg2_T  
  CAboutDlg dlgAbout; Vw^2TRU  
  dlgAbout.DoModal(); T ke3X\|  
 } CWTPf1?eB  
 else x'4q`xDa  
 { .d JX,^  
  CDialog::OnSysCommand(nID, lParam); [dQL6k";b  
 } kgq"b)  
} y .O%  
m>H+noc^  
void CCaptureDlg::OnPaint() \ r^#a  
{ *[P"2b#  
 if (IsIconic()) g[NmVY-o  
 { 8zMt&5jD  
  CPaintDC dc(this); // device context for painting ]f3[I3;K  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); klwC.=?(j"  
  // Center icon in client rectangle PQkFzyk  
  int cxIcon = GetSystemMetrics(SM_CXICON); 1[; 7Ay  
  int cyIcon = GetSystemMetrics(SM_CYICON); [{i"Au]  
  CRect rect; 1&,d,<  
  GetClientRect(&rect); u\jQe@j '  
  int x = (rect.Width() - cxIcon + 1) / 2; iOFp9i=j  
  int y = (rect.Height() - cyIcon + 1) / 2; AqdQiZ^9  
  // Draw the icon pQ_EJX)  
  dc.DrawIcon(x, y, m_hIcon); /tG0"1{  
 } R">-h;#  
 else nOH x^(  
 { !iys\ AV  
  CDialog::OnPaint(); M/O Y "eL  
 } uuD|%-Ng  
} DFk0"+Ky  
'^npZa'%sW  
HCURSOR CCaptureDlg::OnQueryDragIcon() nmH1Wg*aW  
{ sRMz[n 5k  
 return (HCURSOR) m_hIcon; !T'`L{Sj  
} ag_RKlM3  
sbju3nvk  
void CCaptureDlg::OnCancel() D?Mj<||  
{ hR g?H  
 if(bTray) /:+f5\"-b  
  DeleteIcon(); fLtN-w6t  
  CDialog::OnCancel(); j$<sq  
} Z7="on4  
\Nvu[P  
void CCaptureDlg::OnAbout() }MCh$  
{ D(' w<9.  
 CAboutDlg dlg; <T3v|\6~H  
 dlg.DoModal(); JNJ96wnX1  
} u!B6';XY  
b%-S'@ew  
void CCaptureDlg::OnBrowse()  y[C++Q  
{ A"V($:>U  
 CString str; /O^aFIxk  
 BROWSEINFO bi; ma gZmY~  
 char name[MAX_PATH];  [f1'Qb  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Fv<^\q  
 bi.hwndOwner=GetSafeHwnd(); Fx3CY W  
 bi.pszDisplayName=name; e #5LBSP  
 bi.lpszTitle="Select folder"; 'o!{YLJ fM  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; _x2i=SFo*$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9tMaOm  
 if(idl==NULL) ^%qe&Pe2  
  return; :pp@x*uNP  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Fu z'!  
 str.ReleaseBuffer(); +n)_\@aQ  
 m_Path=str; fK0VFN8<I  
 if(str.GetAt(str.GetLength()-1)!='\\') JZo18^aD"'  
  m_Path+="\\"; [J{M'+a  
 UpdateData(FALSE); S{0iPdUC  
} ?_@_NV MY  
k(]R;`f$W  
void CCaptureDlg::SaveBmp() mnG\qsKNLK  
{ ^D%hKIT  
 CDC dc; pef)c,U$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;!C~_{/t  
 CBitmap bm; *3Vic  
 int Width=GetSystemMetrics(SM_CXSCREEN); #B^A"?*S  
 int Height=GetSystemMetrics(SM_CYSCREEN); "KiTjl`M,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); fHLt{!O  
 CDC tdc; r=J+  
 tdc.CreateCompatibleDC(&dc); R/O>^s!Co  
 CBitmap*pOld=tdc.SelectObject(&bm); u alpm#GU  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;h-W&i7  
 tdc.SelectObject(pOld); ,(@JNtx  
 BITMAP btm; M SnRx*-  
 bm.GetBitmap(&btm); g0Ff$-#7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :kU-ol$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #H5i$ o  
 BITMAPINFOHEADER bih; Fmd^9K  
 bih.biBitCount=btm.bmBitsPixel; !1b4q/  
 bih.biClrImportant=0; 5fT"`FL?  
 bih.biClrUsed=0; auai@)v6  
 bih.biCompression=0; ;usR=i36b  
 bih.biHeight=btm.bmHeight; `q$a p$?  
 bih.biPlanes=1; +W7#G `>  
 bih.biSize=sizeof(BITMAPINFOHEADER); <b,oF]+;z  
 bih.biSizeImage=size; =-m"y~{>3  
 bih.biWidth=btm.bmWidth; &*JU N}86  
 bih.biXPelsPerMeter=0; &Rp/y%9  
 bih.biYPelsPerMeter=0; )ZQ>h{}D  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); gic!yhsS_  
 static int filecount=0; T!yI+<  
 CString name; r-s9]0"7~  
 name.Format("pict%04d.bmp",filecount++); [gybdI5wur  
 name=m_Path+name; ,pHQv(K/  
 BITMAPFILEHEADER bfh; %@~;PS3kd  
 bfh.bfReserved1=bfh.bfReserved2=0; TpH-_ft  
 bfh.bfType=((WORD)('M'<< 8)|'B'); L|*0 A=6  
 bfh.bfSize=54+size; Dga;GYx  
 bfh.bfOffBits=54; F*['1eAmdY  
 CFile bf; 11g_!X -g@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ~ubcD6f  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DmA~Vj!a^y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); N+9W2n  
  bf.WriteHuge(lpData,size); *De}3-e1b  
  bf.Close(); \+T U{vr  
  nCount++; _pN:p7l(  
 } Ds<~JfVl  
 GlobalFreePtr(lpData); +I>V9%%vW_  
 if(nCount==1) $[xS>iuD  
  m_Number.Format("%d picture captured.",nCount); r1A<XP|1?I  
 else Pl\r|gS;  
  m_Number.Format("%d pictures captured.",nCount); QUO'{;,  
  UpdateData(FALSE); Yf?hl  
} 51Q m2,P1^  
Q|7$SS6$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Zn{Y+ce7d  
{ {u (( y D  
 if(pMsg -> message == WM_KEYDOWN) TCLXO0  
 { Pea2ENe3  
  if(pMsg -> wParam == VK_ESCAPE) @km@\w  
   return TRUE; 1va~.;/rG  
  if(pMsg -> wParam == VK_RETURN) :AYhBhitC  
   return TRUE; Rh :|ij>B  
 } "2=v:\~=  
 return CDialog::PreTranslateMessage(pMsg); ~#];&WE  
} B~h3naSe  
_g2"D[I%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ak"W/"2:  
{ bn#'o(Lp  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2/>u8j  
  SaveBmp(); F^Y%Q(Dd7w  
  return FALSE; ]k# iA9I  
} :lBw0{fP  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ )C>8B`^S  
 CMenu pop; V~ q b2$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [aF"5G  
 CMenu*pMenu=pop.GetSubMenu(0); %5 ovW<E:  
 pMenu->SetDefaultItem(ID_EXITICON); cfC}"As  
 CPoint pt; + usB$=kJ  
 GetCursorPos(&pt); gA:unsI  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )&s9QBo{b  
 if(id==ID_EXITICON) I&wJK'GM`  
  DeleteIcon(); 1'YUK"i  
 else if(id==ID_EXIT) =1+/`w  
  OnCancel(); X-y3CO:&@h  
 return FALSE; c\le8C3  
} 2Bz\Tsp  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); @:Emmzucv|  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) t\XA JU  
 AddIcon(); dJF3]h Y  
 return res; E"zC6iYZ;  
} k!"6mo@rd  
[:gp_Z&  
void CCaptureDlg::AddIcon() ,v#O{ma  
{ }B ?_>0  
 NOTIFYICONDATA data; 4Ifz-t/  
 data.cbSize=sizeof(NOTIFYICONDATA); ^jE8 "G*  
 CString tip; _A~>?gJ;,  
 tip.LoadString(IDS_ICONTIP); Y&j'2!g  
 data.hIcon=GetIcon(0); }1EtM/Ni{!  
 data.hWnd=GetSafeHwnd(); HJ_8 `( '  
 strcpy(data.szTip,tip); sH.,O9'r  
 data.uCallbackMessage=IDM_SHELL; JLak>MS  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; GMlJM  
 data.uID=98; 8gxo{<,9  
 Shell_NotifyIcon(NIM_ADD,&data); |)y-EBZe\"  
 ShowWindow(SW_HIDE); KP)t,\@f!  
 bTray=TRUE; t"nxny9&  
} 7nPjeh  
O>eg_K,c  
void CCaptureDlg::DeleteIcon() jct'B}@X(  
{ J -z <&9  
 NOTIFYICONDATA data; 6>gm!6`  
 data.cbSize=sizeof(NOTIFYICONDATA); 3Dx@rW\  
 data.hWnd=GetSafeHwnd(); ( TJGJY  
 data.uID=98; 9Cs/B*3)b  
 Shell_NotifyIcon(NIM_DELETE,&data); g=$nNQ \6=  
 ShowWindow(SW_SHOW); (tCBbPW6T?  
 SetForegroundWindow(); zSagsH |W  
 ShowWindow(SW_SHOWNORMAL); *Ksk1T+>  
 bTray=FALSE; %)w7t[A2D  
} AAF']z<4_"  
B:VGa<lx5  
void CCaptureDlg::OnChange() =wMq!mBd  
{ Z#%s/TL  
 RegisterHotkey(); I23"DBR3  
} ~(`&hYE  
NQcNY=  
BOOL CCaptureDlg::RegisterHotkey() aMJJ|iiU  
{ aUi^7;R&<  
 UpdateData(); k'NP+N<M  
 UCHAR mask=0; `$MO;Fv,G  
 UCHAR key=0; uT>"(wnJ|  
 if(m_bControl) jN!VrRA  
  mask|=4; j dkqJ4&i  
 if(m_bAlt) 6a704l%#hb  
  mask|=2; E BSjU8  
 if(m_bShift) nG%<n  
  mask|=1; )4RSo&9p`  
  key=Key_Table[m_Key.GetCurSel()]; p2 !w86 F  
 if(bRegistered){ >*EJ6FPO  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); gnadx52FP  
  bRegistered=FALSE; X!6$<8+1OV  
 } deEc;IAo  
 cMask=mask; b!qlucA eE  
 cKey=key; 6OR)97  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); kZ=2# .  
 return bRegistered; n}C0gt-  
}  i (`Q{l  
p }e| E!  
  四、小结 1'H!S%fS  
QT=i>X  
  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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