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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: ,5J}Wo?Q}  
  @/ G$ C9<  
  一、实现方法 l6z}D; 4  
"4[8pZO/  
  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: JR^#NefJ  
kHx6]<  
#pragma data_seg("shareddata") 'A)r)z {X  
HHOOK hHook =NULL; //钩子句柄 e 0cVg  
UINT nHookCount =0; //挂接的程序数目 , HHCgN  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 KXvBJA$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 [)KLmL%  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey u~\I  
static int KeyCount =0; s$PPJJT{b  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 +L>?kr[i[  
#pragma data_seg() WB(Gx_o3  
S3F8Chk5  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 w$j!89@)  
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  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: MzX4/*ba  
/+zzZnLl-M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR R(dOQ. ;  
cKey,UCHAR cMask) 9aKt (g6  
{ y>jP]LR4  
 BOOL bAdded=FALSE; f'Cx %  
 for(int index=0;index<MAX_KEY;index++){ 3S h#7"K3  
  if(hCallWnd[index]==0){ .!Qo+(  
   hCallWnd[index]=hWnd; +x_9IvaW&?  
   HotKey[index]=cKey; w$%1j+%&  
   HotKeyMask[index]=cMask; ocDAg<wo  
   bAdded=TRUE; lk`,s  
   KeyCount++; Uk@'[_1z  
   break; 3,[#%}1(S  
  } \\{+t<?J  
 } NR|t~C+  
 return bAdded; 22_%u=p-|  
} Lj#K^c Ee  
//删除热键 9zs!rlzQ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X^c2  
{ 1SO!a R#g  
 BOOL bRemoved=FALSE; <-rw>,  
 for(int index=0;index<MAX_KEY;index++){ #yi&-9B  
  if(hCallWnd[index]==hWnd){ ?D8 +wj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5*P+c(=  
    hCallWnd[index]=NULL; 3rh@|fg)E  
    HotKey[index]=0; [t}\8^y  
    HotKeyMask[index]=0; `iT{H]po  
    bRemoved=TRUE; v[J"/:]  
    KeyCount--; )Z qY`by!  
    break; yhzZ[vw7k  
   } MeMSF8zSQ  
  } f&ri=VJY\T  
 } { M&Vh]  
 return bRemoved; G>>TB{}  
} ;.EW7`)Z  
e|2@z-Sp-  
'7;b+Vbl#  
  DLL中的钩子函数如下: &K@ RTgb  
}?KfL$@$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -Mx\W|YK  
{ uW4wTAk;qh  
 BOOL bProcessed=FALSE; Z?"f#  
 if(HC_ACTION==nCode) #ssSs]zl  
 { O4lHR6M2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 HJ^SqSm  
   switch(wParam) .XTR HL*:  
   {  wR]jJb F  
    case VK_MENU: {$H-7-O$  
     MaskBits&=~ALTBIT; Ww)p&don  
     break; yDe6f(D  
    case VK_CONTROL: pB0p?D)n  
     MaskBits&=~CTRLBIT; $vjl-1x&  
     break; g+1&liV  
    case VK_SHIFT: ~>-MVp  
     MaskBits&=~SHIFTBIT; p;0p!~F=49  
     break; Y5,[udF:O  
    default: //judge the key and send message ":!7R<t  
     break; NcMohpkq  
   } x4=Sm0Ro|V  
   for(int index=0;index<MAX_KEY;index++){ [QZ g=."  
    if(hCallWnd[index]==NULL) ]qpLaBD  
     continue; INjr$'*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q!*}^W  
    { bbe$6xwi  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); HY!R|  
     bProcessed=TRUE; p()#+Xy  
    } lC8Z@wkjO  
   } 2>+(OL4l  
  } ]9]o*{_+(f  
  else if((lParam&0xc000ffff)==1){ //有键按下  oo4aw1d  
   switch(wParam) :/<SJ({q  
   { Q}6!t$Vk  
    case VK_MENU: [@;q#.}Z  
     MaskBits|=ALTBIT; ,*MA teD  
     break; (<KFA,  
    case VK_CONTROL: xP+`scv*m#  
     MaskBits|=CTRLBIT; hb ="J349  
     break; bo|3sN+D  
    case VK_SHIFT: 0ub0 [A  
     MaskBits|=SHIFTBIT; $~c wB  
     break; scQnL'\  
    default: //judge the key and send message ?DrA@;IB  
     break; =8V 9E  
   } \@!"7._=  
   for(int index=0;index<MAX_KEY;index++){ 1W r,E#+C  
    if(hCallWnd[index]==NULL) Nbvs_>N   
     continue; P+:DLex  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HE|XDcYO  
    { KBOp}MEz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); !*G%vOa  
     bProcessed=TRUE; NXHe;G  
    } u8Ak2:   
   } aM7=>  
  } s~'"&0Gz  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 @i <vlHpl  
   for(int index=0;index<MAX_KEY;index++){ E*AI}:or;  
    if(hCallWnd[index]==NULL) mJNw<T4!/  
     continue; m"/ o4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J~.`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); xQ,My  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 w<&R|= 93  
   } '4ip~>3?w  
  } C C B'  
 } Q].p/-[(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); l=PZlH y1G  
} \k 6'[ln  
).3riR  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: z50P* eS  
IqAML|C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vzFo"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ")YD~ZA%)  
?[<#>,W  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: FD al;T  
,GF]+nI89  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) b4&l=^:e=  
{ ?DGg.2f  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) QpD- %gN  
 { jS ?#c+9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ShesJj  
  SaveBmp(); V+5av Z}  
  return FALSE; v`@M IOv  
 } i__f%j`!W  
 …… //其它处理及默认处理 ,@kLH"a0  
} > JC"YB  
l;d4Le  
C#LTF-$])  
  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。 />n!2'!  
`a `>Mtl  
  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。 )G),iy  
{l"(EeW6)  
  二、编程步骤 #>M^BOR8  
hdeI/4 B  
  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"; z HT#bP:o  
,N1pww?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :%_h'9Qq  
^8KxU  
  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; V :/v r  
6of9lO:  
  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; f0879(,i  
1 -$+@Xl  
  5、 添加代码,编译运行程序。 #(QS5J&Qq  
Ma4eu8  
三、程序代码 G.r .Z0  
w75Ro6y  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &NOCRabc  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) MOPHu O{^  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ !mmSF1f  
#if _MSC_VER > 1000 *{,}pK2*  
#pragma once +p[O|[z  
#endif // _MSC_VER > 1000 m>|7&l_  
#ifndef __AFXWIN_H__ k[)/,1  
#error include 'stdafx.h' before including this file for PCH AZf69z  
#endif r KYQ 8T  
#include "resource.h" // main symbols &@FufpPw/  
class CHookApp : public CWinApp lL'Bop@  
{ qI>,PX  
 public: yuC|_nL  
  CHookApp(); k!bG![Ie|  
  // Overrides \u04m}h]  
  // ClassWizard generated virtual function overrides -/ G#ls|?  
  //{{AFX_VIRTUAL(CHookApp) :|8!w  
 public: "[-W(=  
  virtual BOOL InitInstance(); [)?9|yY"`  
  virtual int ExitInstance(); #l h' !  
  //}}AFX_VIRTUAL [kTckZv  
  //{{AFX_MSG(CHookApp) .K1wp G[4  
  // NOTE - the ClassWizard will add and remove member functions here. 1:Ff#Eq,s  
  // DO NOT EDIT what you see in these blocks of generated code ! /E3~z0  
  //}}AFX_MSG f|ERZN`uB  
  DECLARE_MESSAGE_MAP() C\Z5%2<Z  
}; "&{.g1i9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); }u1h6rd `  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :wEy""*N0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O\gVB!x  
BOOL InitHotkey(); ty:{e]e  
BOOL UnInit(); Q+/P>5O/  
#endif _h`4`r  
C9_[ke[1D  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 0|i|z !N>  
#include "stdafx.h" *K& $9fah  
#include "hook.h" dWu;F^  
#include <windowsx.h> +~* e B  
#ifdef _DEBUG 17`-eDd  
#define new DEBUG_NEW ^go3F{; 4i  
#undef THIS_FILE U(Bmffn4Z  
static char THIS_FILE[] = __FILE__; Jw>na _FJ  
#endif m>3\1`ZF~<  
#define MAX_KEY 100 |qwx3 hQ?  
#define CTRLBIT 0x04 So75h*e  
#define ALTBIT 0x02 4?+jvVq  
#define SHIFTBIT 0x01 .XVL JJ#  
#pragma data_seg("shareddata") jW4>WDN:  
HHOOK hHook =NULL; Gm3`/!r  
UINT nHookCount =0; )]LP8 J&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~w9`l8/0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT V6h8+|hK  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (9=E5n6o  
static int KeyCount =0; X<pNc6  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift US"UkY-\  
#pragma data_seg() _3NH"o d  
HINSTANCE hins; LU8:]zOY  
void VerifyWindow(); fU\;\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &Nw|(z&$  
//{{AFX_MSG_MAP(CHookApp) pSEaE9AX%  
// NOTE - the ClassWizard will add and remove mapping macros here. ]=]MJ3_7  
// DO NOT EDIT what you see in these blocks of generated code! 'H4?V  
//}}AFX_MSG_MAP .<xD'54  
END_MESSAGE_MAP() JoZzX{eu"  
rhX?\_7o  
CHookApp::CHookApp() &Vu-*?  
{ M _lLP8W}  
 // TODO: add construction code here, y+V>,W)r7  
 // Place all significant initialization in InitInstance ts("(zI1E  
} R~|(]#com  
e**'[3Y  
CHookApp theApp; QUfF>,[sv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g!r) yzK  
{ 83p8:C.Ze  
 BOOL bProcessed=FALSE; #l.s> B4  
 if(HC_ACTION==nCode) \3%3=:  
 { m(EV C}Y  
  if((lParam&0xc0000000)==0xc0000000){// Key up y\[* mgl:  
   switch(wParam) tA'5ufj*:  
   { .I$+ E  
    case VK_MENU: lz1cLl m  
     MaskBits&=~ALTBIT; }W[=O:p  
     break; #`l&HV   
    case VK_CONTROL: +"JWsD(C(  
     MaskBits&=~CTRLBIT; :f7vGO"t  
     break; iP:^nt?  
    case VK_SHIFT: :_nGh]%  
     MaskBits&=~SHIFTBIT; ~"4Cz27  
     break; %M`zkA2]J  
    default: //judge the key and send message 86dz Jh  
     break; B(6*U~Kn%  
   } .|TF /b]  
   for(int index=0;index<MAX_KEY;index++){ \%%M>4c  
    if(hCallWnd[index]==NULL) ;XlCd[J<  
     continue; Ex@}x#3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4cJ/XgX  
    { *,*XOd:3TL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); gw%L M7yQR  
     bProcessed=TRUE; PI,2b(`h_  
    } Tu,nX'q]m  
   } l|vT[X/g  
  } 5~(nHCf>  
  else if((lParam&0xc000ffff)==1){ //Key down v |pHbX  
   switch(wParam) * kUb[  
   { JE*?O*&|Q  
    case VK_MENU: :<0lCj  
     MaskBits|=ALTBIT; cS@p`A7Tpo  
     break; 9}42s+  
    case VK_CONTROL: No+BS%F5  
     MaskBits|=CTRLBIT; sEZ2DnDI  
     break; 6Bexwf<u  
    case VK_SHIFT: XaoVv2=G~  
     MaskBits|=SHIFTBIT; vBM<M3  
     break; "-AFWWKtx  
    default: //judge the key and send message EaH/Gg3  
     break; A_2lG!! 6  
   } qF`]}7"^  
   for(int index=0;index<MAX_KEY;index++) S@~ReRew2  
   { 6@FxPi9|#  
    if(hCallWnd[index]==NULL) 3Q)"  
     continue; IF<T{/MA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u09D`QPP]  
    { YG*}F|1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l2wu>Ar7.  
     bProcessed=TRUE; :`<MlX  
    } )oM% N  
   } uaCI2I  
  } at2)%V)  
  if(!bProcessed){ pE0@m-p  
   for(int index=0;index<MAX_KEY;index++){ Imyw-8/;  
    if(hCallWnd[index]==NULL) nf:wJ-;*  
     continue; {W%XS E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) XB:E<I'q!3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); IEI&PRD  
   } UF}Ji#fqn  
  } e<~bDFH  
 } %/!f^PIwX  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &b-&0 rTqz  
} 0j}@lOt(  
"tDB[?  
BOOL InitHotkey() g"g3|$#Ej|  
{ Kv#Q$$)r  
 if(hHook!=NULL){ ^$rqyWZYp  
  nHookCount++; 5CH8;sMK  
  return TRUE; y"K[#&,0  
 } [8 23w.{]#  
 else ^ 7)H;$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); IL?"g{w  
  if(hHook!=NULL) VmXXj6l&  
   nHookCount++; ;D%H}+Z  
  return (hHook!=NULL); rV*Ri~Vx  
} @Q!Tvw/  
BOOL UnInit() [3x*47o"z  
{ =t|,6Vp  
 if(nHookCount>1){ j|[>f  
  nHookCount--; QVl"l'e8  
  return TRUE; H#T&7X_<  
 } V%`\x\Xat  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 3,Iu!KB  
 if(unhooked==TRUE){ i\#?M  "  
  nHookCount=0; }5Km \OI  
  hHook=NULL; L_M(Lj  
 } <uo@k'   
 return unhooked; #TB 3|=  
} tK 6=F63e  
:g+ wv}z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) MaF4lFmS  
{ ih : XC  
 BOOL bAdded=FALSE; J M;WCV%NM  
 for(int index=0;index<MAX_KEY;index++){ *{O[}  
  if(hCallWnd[index]==0){ YmHu8H_Q  
   hCallWnd[index]=hWnd; o;OEb  
   HotKey[index]=cKey; AH:0h X6+  
   HotKeyMask[index]=cMask; iUZV-jl2/  
   bAdded=TRUE; H6lZ<R{=  
   KeyCount++; +.uQToqy  
   break; VWk{?*Dp  
  } '{)Jhl47   
 } y<l(F?_  
 return bAdded; cXb&Rm' L  
} jZiz 0[  
L08lkq,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %Vk77(  
{ u7},+E)+B  
 BOOL bRemoved=FALSE; E=]|v+#~  
 for(int index=0;index<MAX_KEY;index++){ ss`Sl$  
  if(hCallWnd[index]==hWnd){ vb9C&#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ qTG i9OP6/  
    hCallWnd[index]=NULL; gN]\#s@[  
    HotKey[index]=0; ~9@83Cs2  
    HotKeyMask[index]=0; HK VtO%&  
    bRemoved=TRUE; r$Oa  
    KeyCount--; f*Os~@K  
    break; q w @g7  
   } VL|Z+3L  
  } Q!r` G  
 } Zb:Z,O(vn  
 return bRemoved; D[Q/:_2l  
} 2G_]Y8  
MHA_b^7?  
void VerifyWindow() \p^'[B(O77  
{ UtR wZ(09  
 for(int i=0;i<MAX_KEY;i++){ yI / FD  
  if(hCallWnd!=NULL){ Zh`[A9I/  
   if(!IsWindow(hCallWnd)){ 3u< ntx ><  
    hCallWnd=NULL; 1Vs>G  
    HotKey=0; 3^-\=taN<m  
    HotKeyMask=0; o.s(=iG  
    KeyCount--; U.Y7]#P:  
   } `]a0z|2'!  
  } ,Kt51vGi  
 } U/_hH*N"!  
} ^z51f>C  
?P/73p  
BOOL CHookApp::InitInstance() 7R5+Q\W  
{ ]<S{3F=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); hoLA*v2<  
 hins=AfxGetInstanceHandle(); 8is QL  
 InitHotkey(); as@? Kv  
 return CWinApp::InitInstance(); -lR7 @S  
} !'B='].  
Eqh*"hE7  
int CHookApp::ExitInstance()  R*r"};  
{ 9_ZGb"(Lj  
 VerifyWindow(); D0>Pc9  
 UnInit(); :>F3es`  
 return CWinApp::ExitInstance(); 9TwKd0AT$&  
} I1I-,~hO  
<kWkc|z BY  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *]nk{jo2  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) `>OKV;~{z  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 6Cfsh<]b  
#if _MSC_VER > 1000 ^F&j;8U  
#pragma once e0j4t-lL  
#endif // _MSC_VER > 1000 whm| "}x)u  
Wfy+9"-;s  
class CCaptureDlg : public CDialog ^x_$%8  
{ /!qP=ngw9  
 // Construction 3[8p,wx  
 public: C~C`K%7  
  BOOL bTray; X,{[R |  
  BOOL bRegistered; T6."j_  
  BOOL RegisterHotkey(); RE4WD9n  
  UCHAR cKey; }0iHf'~DH*  
  UCHAR cMask; $VhY"<  
  void DeleteIcon(); 5>ktr)]  
  void AddIcon(); F!p;]B  
  UINT nCount; cDK)zD  
  void SaveBmp(); )uMv]  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor d8U<V<H<  
  // Dialog Data @4]{ZUV  
  //{{AFX_DATA(CCaptureDlg) ~O]{m,)n  
  enum { IDD = IDD_CAPTURE_DIALOG }; 6Nt/>[  
  CComboBox m_Key; *||Q_tlz  
  BOOL m_bControl; TKgN31`  
  BOOL m_bAlt; qw>vu7/z  
  BOOL m_bShift; "h|kf% W  
  CString m_Path; \A)Pcc}7  
  CString m_Number; ` U-vXP  
  //}}AFX_DATA  m]H]0T  
  // ClassWizard generated virtual function overrides a6O <t;&  
  //{{AFX_VIRTUAL(CCaptureDlg) tU *`X(;  
 public: .2s^8gO  
  virtual BOOL PreTranslateMessage(MSG* pMsg); XVJH>Zw  
 protected: ayQeT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support CGkx_E]  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); H6Bw3I[  
  //}}AFX_VIRTUAL f^ZhFu?  
  // Implementation Bf6i{`!G  
 protected: <]X 6%LX  
  HICON m_hIcon; 9X +dp  
  // Generated message map functions =;E0PB_w  
  //{{AFX_MSG(CCaptureDlg) 9!kp3x/`  
  virtual BOOL OnInitDialog(); 4nGt*0Er  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Uw!d;YQm  
  afx_msg void OnPaint(); Y=g]\%-PB  
  afx_msg HCURSOR OnQueryDragIcon(); h=JW^\?\]  
  virtual void OnCancel(); >5?:iaq z  
  afx_msg void OnAbout(); /J&ks>St  
  afx_msg void OnBrowse(); #9F>21UU  
  afx_msg void OnChange(); E31Yk D.A  
 //}}AFX_MSG 7#NHPn  
 DECLARE_MESSAGE_MAP() O .-n&U9  
}; $EEn]y  
#endif &flRrJ  
5jUy[w @  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  ST0TWE'  
#include "stdafx.h" < (B|g&A  
#include "Capture.h" M)nh~gU  
#include "CaptureDlg.h" iz{TSU  
#include <windowsx.h> e9tb]sAG  
#pragma comment(lib,"hook.lib") 1 ltW9^cF}  
#ifdef _DEBUG s@{~8cHgU  
#define new DEBUG_NEW ^E:-Uy  
#undef THIS_FILE ByO?qft>u  
static char THIS_FILE[] = __FILE__; m7C!}l]9  
#endif 3,X8 5`v^  
#define IDM_SHELL WM_USER+1 2eA.04F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3D1y^I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ts}OE  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; GZKYRPg  
class CAboutDlg : public CDialog Yyr9Kj:  
{ -A=3W3:C  
 public: "v( pluN|  
  CAboutDlg(); *Ms"{+C  
  // Dialog Data xI~A Z:m  
  //{{AFX_DATA(CAboutDlg) W&&|T;P<J  
  enum { IDD = IDD_ABOUTBOX }; [u37 Hy_Gi  
  //}}AFX_DATA L F} d  
  // ClassWizard generated virtual function overrides ! K_<hNG&  
  //{{AFX_VIRTUAL(CAboutDlg) K"&^/[vMB  
 protected: RqP_^tB  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +^&i(7a[?  
  //}}AFX_VIRTUAL +!E9$U>6%  
  // Implementation 5E1`qof  
 protected: `9+R]C]z8  
  //{{AFX_MSG(CAboutDlg) u@`a~  
  //}}AFX_MSG G%;>_E  
  DECLARE_MESSAGE_MAP() '3Q~y"C+4  
}; D~URY_[A  
ey,f igjd.  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) XWQ `]m)  
{ tHHJ|4C  
 //{{AFX_DATA_INIT(CAboutDlg) @"1Z;.S8V  
 //}}AFX_DATA_INIT .4tu{\YX  
} P:N> #G~z  
FfrC/"N  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #D|%r-:"  
{ bt_c$TN  
 CDialog::DoDataExchange(pDX); B RskxyL&,  
 //{{AFX_DATA_MAP(CAboutDlg) )S 4RR2Q>  
 //}}AFX_DATA_MAP :z&kbG  
} II|;_j  
%7P]:G+Y\  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |+::sL\r  
 //{{AFX_MSG_MAP(CAboutDlg) 9__B!vw:  
 // No message handlers 79@CO6  
 //}}AFX_MSG_MAP B{D4.!a  
END_MESSAGE_MAP() a:`<=^:4,  
a$Y{ut0t(  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T *PEUq  
: CDialog(CCaptureDlg::IDD, pParent) Wf"GA i  
{ OKK Ko`RN  
 //{{AFX_DATA_INIT(CCaptureDlg) sQkijo.  
  m_bControl = FALSE; s-+-?$K  
  m_bAlt = FALSE; C.ji]P#  
  m_bShift = FALSE; H!u8+  
  m_Path = _T("c:\\"); [fV"tf;  
  m_Number = _T("0 picture captured."); Z"_8 l3  
  nCount=0; }r,xx{.u7  
  bRegistered=FALSE; |N"K83_pr  
  bTray=FALSE; 9d-'%Q>+  
 //}}AFX_DATA_INIT =_zo  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 2IRARZ,3  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); , QWus"5H  
} v<g=uEpN  
*AQ3RA8  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~%g,Uypi  
{ j~K(xf  
 CDialog::DoDataExchange(pDX); ?%qaoxG37  
 //{{AFX_DATA_MAP(CCaptureDlg) e98QT9  
  DDX_Control(pDX, IDC_KEY, m_Key); Y6H?ZOq  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *pSnEWwE  
  DDX_Check(pDX, IDC_ALT, m_bAlt); g3&nxZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); :q*w_*w  
  DDX_Text(pDX, IDC_PATH, m_Path); R6o  D  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \G>C{v;  
 //}}AFX_DATA_MAP 5[jS(1a`c  
} 5X+`aB  
}F!Uu KR  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2w8cJadT'p  
//{{AFX_MSG_MAP(CCaptureDlg) w43b=7  
 ON_WM_SYSCOMMAND() 9RHDkK{5  
 ON_WM_PAINT() ? ,s'UqR  
 ON_WM_QUERYDRAGICON() }Oc+EV-Z  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) U&u63 56  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) y&5 O)  
 ON_BN_CLICKED(ID_CHANGE, OnChange) WPNw")t!  
//}}AFX_MSG_MAP :??W3ROn  
END_MESSAGE_MAP() {}k3nJfE  
k?&GL!?  
BOOL CCaptureDlg::OnInitDialog() P(b[|QF  
{ 0RMW>v/7kL  
 CDialog::OnInitDialog(); FGHCHSqLq  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2&n6:"u|  
 ASSERT(IDM_ABOUTBOX < 0xF000); YX-j|m|  
 CMenu* pSysMenu = GetSystemMenu(FALSE); O!f37n-TB  
 if (pSysMenu != NULL) 4c 8{AZ  
 { l1'v`!  
  CString strAboutMenu; k)*apc\W  
  strAboutMenu.LoadString(IDS_ABOUTBOX); =Q<7[  
  if (!strAboutMenu.IsEmpty()) + c3pe4  
  { *->*p35  
   pSysMenu->AppendMenu(MF_SEPARATOR); mHW%:a\L  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Gt*K:KT=L  
  } >4Tk#+%Jj  
 } z{\tn.67  
 SetIcon(m_hIcon, TRUE); // Set big icon sBa:|(Y.  
 SetIcon(m_hIcon, FALSE); // Set small icon u%z'.#r;a  
 m_Key.SetCurSel(0); CZ u=/8?  
 RegisterHotkey(); 5G\OINxy  
 CMenu* pMenu=GetSystemMenu(FALSE); DMG'8\5C  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); RIXeV*ix  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); P4_B.5rrJ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hN!;Tny  
 return TRUE; // return TRUE unless you set the focus to a control v9Ii8{ca|  
} pMHl<HH  
\zg R]|  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) eg}g} a  
{ s.Z{mnD6  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) xCXsyZ2h  
 { tyW}=xs  
  CAboutDlg dlgAbout; uuwJ-  
  dlgAbout.DoModal(); c( U,FUS  
 } !"qT2<A  
 else 7AT8QC`u  
 { }#ta3 x  
  CDialog::OnSysCommand(nID, lParam); IS(F_< .  
 } QR"+fzOL  
} 9G SpDc  
3\j`g  
void CCaptureDlg::OnPaint() N6-7RoA+  
{ b7\>=  
 if (IsIconic()) Z8bg5%  
 { uBt ]4d*  
  CPaintDC dc(this); // device context for painting pIC'nO_  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6}I X{nQI  
  // Center icon in client rectangle EniV-Uj\D  
  int cxIcon = GetSystemMetrics(SM_CXICON); H i8V=+  
  int cyIcon = GetSystemMetrics(SM_CYICON); <#?dPDMG.*  
  CRect rect; r/AOgS  
  GetClientRect(&rect); !`?i>k?Q E  
  int x = (rect.Width() - cxIcon + 1) / 2; i'H]N8,A  
  int y = (rect.Height() - cyIcon + 1) / 2; $%DoLpE>  
  // Draw the icon N~=PecQ  
  dc.DrawIcon(x, y, m_hIcon); 0*5Jq#5  
 } "o`?-bQ:  
 else iQ:eR]7X  
 { %?].( Lc  
  CDialog::OnPaint(); $ eI cCLF  
 } )4B`U(%M~  
} OXQA(%MK  
^_@[1'^  
HCURSOR CCaptureDlg::OnQueryDragIcon() OeASB}  
{ W[Q<# Ju  
 return (HCURSOR) m_hIcon; ynM~&]fk#k  
} v"yu7tZ3N  
 hO$Gx*e$  
void CCaptureDlg::OnCancel() 5|~g2Zz{;  
{ qqZ4K:oC,  
 if(bTray) tT)s,R%  
  DeleteIcon(); -~8PI2  
  CDialog::OnCancel(); K% FK  
} , p}:?uR  
W+Mw:,>*s  
void CCaptureDlg::OnAbout() xS12$ib ~G  
{ /}E2Rr?{  
 CAboutDlg dlg; E~WbV+,3  
 dlg.DoModal(); }WFI /W'  
} 80lhhqRC  
";7N$hWE  
void CCaptureDlg::OnBrowse() P=,\wM6T|  
{ A+Isk{d  
 CString str; 2c[HA  
 BROWSEINFO bi; TPBQfp%HU  
 char name[MAX_PATH]; Q ]TZyk  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); tKUW  
 bi.hwndOwner=GetSafeHwnd(); yW'{Z]09  
 bi.pszDisplayName=name; [Lje?M* r  
 bi.lpszTitle="Select folder"; L:Rg3eo  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; kJuG haO  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); PZ6R+n8  
 if(idl==NULL) Q`8-|(ngw  
  return; sz270k%[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); {~O4*2zg;K  
 str.ReleaseBuffer(); !5De?OXe   
 m_Path=str;  \8C<nh  
 if(str.GetAt(str.GetLength()-1)!='\\') #n+u>x.O  
  m_Path+="\\"; };rp25i  
 UpdateData(FALSE); _ s}aF  
} vS~tr sI  
',`Qx{tQ)  
void CCaptureDlg::SaveBmp() z{Yfiv\-r  
{ dF51_Kk  
 CDC dc; {'+{ASpO!  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); b(|&e  
 CBitmap bm;  q%d'pF  
 int Width=GetSystemMetrics(SM_CXSCREEN); 08jk~$%  
 int Height=GetSystemMetrics(SM_CYSCREEN); Sd ^I >;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); d.w]\  
 CDC tdc; 6BA$v-VVU  
 tdc.CreateCompatibleDC(&dc); \='LR!_  
 CBitmap*pOld=tdc.SelectObject(&bm); JL#LCU ?  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6 M:?W"  
 tdc.SelectObject(pOld); 1SS1P0Ur  
 BITMAP btm; 6;Z`9PGp  
 bm.GetBitmap(&btm); C;:=r:bth  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; U 5j4iz'  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FY Flh^}  
 BITMAPINFOHEADER bih; >%`SXB& 9  
 bih.biBitCount=btm.bmBitsPixel; N}nE9z5  
 bih.biClrImportant=0; O&/n BHu\  
 bih.biClrUsed=0; }[|9vF"g.y  
 bih.biCompression=0; H0OO +MCe  
 bih.biHeight=btm.bmHeight; u8JH~b  
 bih.biPlanes=1; %pxJ27Q  
 bih.biSize=sizeof(BITMAPINFOHEADER); qZ>_{b0f  
 bih.biSizeImage=size; kw z6SObQ  
 bih.biWidth=btm.bmWidth; `,~'T [  
 bih.biXPelsPerMeter=0; \(Nx)F  
 bih.biYPelsPerMeter=0; ]SAY\;,_  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); g"'BsoJ  
 static int filecount=0; zx8@4?bK  
 CString name; 9C?SEbC  
 name.Format("pict%04d.bmp",filecount++); b 4^O=  
 name=m_Path+name; |;|r[aU  
 BITMAPFILEHEADER bfh; :Wx7a1.Jz  
 bfh.bfReserved1=bfh.bfReserved2=0;  1hi  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 93.\.&L\  
 bfh.bfSize=54+size; MkGQ  
 bfh.bfOffBits=54; w6> P[oW  
 CFile bf; 1l)j(,Zd*  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Q'=7#_  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 1(T2:N(M-A  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 40 u tmC  
  bf.WriteHuge(lpData,size); _nz_.w0H9  
  bf.Close(); 99:.j=  
  nCount++; ul_E{v  
 } I&i6-xp  
 GlobalFreePtr(lpData); *wx%jbJo  
 if(nCount==1) LrO[l0#'Q  
  m_Number.Format("%d picture captured.",nCount); B+Qo{-  
 else !.#g   
  m_Number.Format("%d pictures captured.",nCount); ]vR Ol.  
  UpdateData(FALSE); ex~"M&^  
} }U>K>"AZl  
}@ U}c6/  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) UzSDXhzObf  
{ /#{~aCOi)  
 if(pMsg -> message == WM_KEYDOWN) qB@N|Bb  
 { $;=^|I4E  
  if(pMsg -> wParam == VK_ESCAPE) ktfxb <%  
   return TRUE; '-f` 5X  
  if(pMsg -> wParam == VK_RETURN) _&gO>G,uy  
   return TRUE; wpN [0^M-0  
 } zobFUFx  
 return CDialog::PreTranslateMessage(pMsg); P}Mu|AEG  
} -0;{  
hJ%$Te  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lBG=jOS  
{ b(U5n"cdA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ #sF#<nHZ  
  SaveBmp(); hEo$Jz`  
  return FALSE; /160pl 4  
} EGv]K|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ )!VJ\  
 CMenu pop; $ SA @ "  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); f$}g'r zl  
 CMenu*pMenu=pop.GetSubMenu(0); KMfIp:~  
 pMenu->SetDefaultItem(ID_EXITICON); 4Hyp]07  
 CPoint pt; p;o"i_!  
 GetCursorPos(&pt); &'PLOyWw  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); L?a4>uVY  
 if(id==ID_EXITICON) 2\64~a^  
  DeleteIcon(); RFe># o  
 else if(id==ID_EXIT) 8N j}  
  OnCancel(); 3zfiegY@wm  
 return FALSE; l(3PxbT  
} p[|V7K'Z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); s^)(.e_  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) n]w%bKc-9  
 AddIcon(); e :ub]1I=  
 return res; <ldArZ4C4  
} K4|fmgcy.  
oWDn_GnG`h  
void CCaptureDlg::AddIcon() '>bn94$  
{ F|VHr@%  
 NOTIFYICONDATA data; i 28TH Jh  
 data.cbSize=sizeof(NOTIFYICONDATA); K",Xe>  
 CString tip; r4 5}o  
 tip.LoadString(IDS_ICONTIP); !p36OEx  
 data.hIcon=GetIcon(0); X H!n{Of  
 data.hWnd=GetSafeHwnd(); d{WOO)j  
 strcpy(data.szTip,tip); .}!.: |  
 data.uCallbackMessage=IDM_SHELL; 3h o'\Ysu/  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; x>K,{{B)X  
 data.uID=98; QDK }e:4q  
 Shell_NotifyIcon(NIM_ADD,&data); 6PWw^Cd  
 ShowWindow(SW_HIDE); P?8$VAkj  
 bTray=TRUE; D}ZPgt#   
} !q/Q2N(  
BdvpG  
void CCaptureDlg::DeleteIcon() y{P~!Yn|  
{ 8<6@O  
 NOTIFYICONDATA data; 0iMfyW:  
 data.cbSize=sizeof(NOTIFYICONDATA); C^]UK  
 data.hWnd=GetSafeHwnd(); PK{FQ3b2{  
 data.uID=98; )P+<=8@a  
 Shell_NotifyIcon(NIM_DELETE,&data); IK4(r /  
 ShowWindow(SW_SHOW); F2n4#b  
 SetForegroundWindow(); t > 64^nS  
 ShowWindow(SW_SHOWNORMAL); .[:WMCc\  
 bTray=FALSE; 97>|eDc Y  
} XTb .cqOC  
>)>~S_u  
void CCaptureDlg::OnChange() ,&O&h2=  
{ 51AA,"2[_  
 RegisterHotkey(); `'(@"-L:7  
} 6|6O| <o  
$`C$|9S  
BOOL CCaptureDlg::RegisterHotkey() cI7aTLC"s  
{ }LWrtmc  
 UpdateData(); :.-KM7tDI1  
 UCHAR mask=0; L&5zr_  
 UCHAR key=0; m+pK,D~{"  
 if(m_bControl) n34d "l3  
  mask|=4; h^{ aG])  
 if(m_bAlt) r24 s_  
  mask|=2; kMa|V0  
 if(m_bShift) ^}z:FI   
  mask|=1; /Vv)00  
  key=Key_Table[m_Key.GetCurSel()]; ~( rZ)  
 if(bRegistered){ {@" F/G+  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^d9o \  
  bRegistered=FALSE; ^@'zQa  
 } 8-O: e  
 cMask=mask; *TxR2pC}  
 cKey=key; 7{rRQ~s&g9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); %~Ymb&ugg  
 return bRegistered; 6UPGE",u  
} #Oa`P  
h9. Yux  
  四、小结 q}"HxMJ  
$nf %<Q  
  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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