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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: yv;KKQ   
  ShIJ6LZ  
  一、实现方法 MwuRxeRO-  
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  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: /&i6vWMhP  
ez-jVi-Fi  
#pragma data_seg("shareddata") 6(1S_b=a  
HHOOK hHook =NULL; //钩子句柄 c%+_~iBUN  
UINT nHookCount =0; //挂接的程序数目 7W MF8(j5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 zk;'`@7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @* <`*W  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey kf:Nub+h t  
static int KeyCount =0; 1RgERj  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 5$?)f&M  
#pragma data_seg() v;sWI"Fv!  
U^;|as  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 KaIkO8Dq0  
1\X_B`xwD  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: =T-jG_.H  
| 9 <+!t\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR E)iX`Xq|0{  
cKey,UCHAR cMask) ujf]@L?  
{ edL sn>\*#  
 BOOL bAdded=FALSE; u_=^Bd   
 for(int index=0;index<MAX_KEY;index++){ m ##_U9O  
  if(hCallWnd[index]==0){ 3^,p$D<T:,  
   hCallWnd[index]=hWnd; A7I{Le  
   HotKey[index]=cKey; +Ym#!"  
   HotKeyMask[index]=cMask; <dKHZ4  
   bAdded=TRUE; ?dy t!>C  
   KeyCount++; dAr=X4LE  
   break; Y_FQB K U  
  } !DkIM}.  
 } m2\[L/W]  
 return bAdded; %w;wQ_  
} <64#J9T^  
//删除热键 717OzrF}A?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LYke\/ md  
{ {yFMY?6rf  
 BOOL bRemoved=FALSE; A\})H  
 for(int index=0;index<MAX_KEY;index++){ .1f!w!ltVR  
  if(hCallWnd[index]==hWnd){ =>- W!Of  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :0kKw=p1R  
    hCallWnd[index]=NULL; zmhAeblA  
    HotKey[index]=0; T}jW,Ost  
    HotKeyMask[index]=0; juA}7   
    bRemoved=TRUE; #!C|~=  
    KeyCount--; f{-,"6Y1  
    break; .\+c{  
   } 6Z5$cR_vC7  
  } qGi\*sc>x  
 } (@NW2  
 return bRemoved; eB9F35[  
} l% p4.CX  
R(s[JH(&  
sWKv> bx  
  DLL中的钩子函数如下: J4Ca0Ag  
{S`Rr/E|%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |\RN%w7E8  
{ ,U~in)\ U  
 BOOL bProcessed=FALSE; g,B@*2Uj  
 if(HC_ACTION==nCode) Rl'xEtaN  
 { ,x utI  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 c_u7O \  
   switch(wParam) E(*S]Z[  
   {  F(`Q62o@  
    case VK_MENU: @9lGU#  
     MaskBits&=~ALTBIT; SduUXHk  
     break; OI:T#uk5  
    case VK_CONTROL: 9hgIQl  
     MaskBits&=~CTRLBIT; C't%e  
     break; RN$q,f[#  
    case VK_SHIFT: 7 6HB@'xY  
     MaskBits&=~SHIFTBIT; q)PSHr=Z  
     break; [OFT!=.y &  
    default: //judge the key and send message O]l-4X#8F  
     break; !lKDNQ8>["  
   } @"iNjqxh  
   for(int index=0;index<MAX_KEY;index++){ ^y~oXS(  
    if(hCallWnd[index]==NULL) 3*R(&O6}  
     continue; ;1k_J~Qei  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _+gpdQq\p  
    { xEB 4oQ5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); PAiVUGp5[  
     bProcessed=TRUE; R%JEx3)0m  
    } 1(kd3 qX  
   } Y5TBWcGU%  
  } `Mo%)I<`=  
  else if((lParam&0xc000ffff)==1){ //有键按下 s%?<:9  
   switch(wParam) +EZr@  
   { 7A  
    case VK_MENU: ">s0B5F7  
     MaskBits|=ALTBIT; pe+m%;nzR  
     break; lb]k"L%KU7  
    case VK_CONTROL: i k0w\*  
     MaskBits|=CTRLBIT; [ <Q{  
     break; ?#__#  
    case VK_SHIFT: +*RpOtss  
     MaskBits|=SHIFTBIT; l> >BeZ  
     break; }80n5 X<9  
    default: //judge the key and send message 3iiOxg?j  
     break; JM*rPzp  
   } l_x>.'a  
   for(int index=0;index<MAX_KEY;index++){ .|K\1qGW0  
    if(hCallWnd[index]==NULL) ]j(Ld\:L  
     continue; _"'-f l98*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j MA%`*r  
    { T f^O(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); !v3wl0  
     bProcessed=TRUE; GF Rd:e  
    } g: "Hg-s  
   } @HXXhYH  
  } >2)!w  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 N?Ss/by8Sg  
   for(int index=0;index<MAX_KEY;index++){ ;}k_2mr~  
    if(hCallWnd[index]==NULL) j0jam:.p  
     continue; !?)iP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *Xd_=@L&B  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wT\dzp>/  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 SiJX5ydz  
   } yM34GS=,J  
  } u"a$/  
 } 4U:+iumy2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *-9b!>5eD  
} YCQ+9  
e<^4F%jSK  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: u\.sS|$  
{M~!?# <K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /l$noaskX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #=.h:_9  
8rpN2M 3h  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: B=c^ma  
VD3[ko  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;W*$<~_  
{ !3&vgvr  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ? sewU9*  
 { 8c|IGC  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 e#OU {2X  
  SaveBmp(); ]Ojt3) fB  
  return FALSE; y14@9<~9  
 } Mk9 kGP%  
 …… //其它处理及默认处理 }I`|*6Up  
}  Fszk?0T  
/&dt!.WY^  
d?P aZz{4  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 tj&A@\/  
-oo=IUk  
  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。 M:SxAo-D2  
XN0Y#l  
  二、编程步骤 WE7l[<b  
D_)vGvv3;.  
  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"; m#eD v*  
t;1NzI$^  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; [Bh]\I'  
FS}z_G|4]  
  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; W*m[t&;  
p{J_d,JH  
  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; X m3t xp#  
vSA%A47G  
  5、 添加代码,编译运行程序。 V"ZbKV +[  
bsr y([N>w  
三、程序代码 KV*:,>  
GXRjR\Ch  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL K?je(t^  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) c" 7pf T  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ h<.[U $,  
#if _MSC_VER > 1000 <.B s`P  
#pragma once M::iU_  
#endif // _MSC_VER > 1000 9F](%/  
#ifndef __AFXWIN_H__ 0)]1)z(P  
#error include 'stdafx.h' before including this file for PCH NLl~/smMS  
#endif ,Tl5@RN  
#include "resource.h" // main symbols +CT$/k  
class CHookApp : public CWinApp Snu;5:R  
{ wjJ1Psnx  
 public: 03o3[g?  
  CHookApp(); V2,WP  
  // Overrides 7]j-zv  
  // ClassWizard generated virtual function overrides ^^SfIK?p  
  //{{AFX_VIRTUAL(CHookApp) =.hDf<U  
 public: Zg&\K~OC  
  virtual BOOL InitInstance(); cvA\C_  
  virtual int ExitInstance(); )X;cS} yp  
  //}}AFX_VIRTUAL K, 5ax@  
  //{{AFX_MSG(CHookApp) 7y Te]O  
  // NOTE - the ClassWizard will add and remove member functions here. ] <3?=$  
  // DO NOT EDIT what you see in these blocks of generated code ! S\5k' ifh  
  //}}AFX_MSG znO00qX  
  DECLARE_MESSAGE_MAP() &;U7/?Q  
}; i q:Q$z&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Z3>xpw G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1cBhcYv"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `;CU[Ps?]  
BOOL InitHotkey(); je4&'vyU  
BOOL UnInit(); Q'% o;z*  
#endif l6c%_<P|  
YB~t|m65  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. F ^t?*   
#include "stdafx.h" ~hslLUE  
#include "hook.h" N"RYM~c7  
#include <windowsx.h> chmJ|  
#ifdef _DEBUG F}(QKO*  
#define new DEBUG_NEW <>i+R#u{  
#undef THIS_FILE ?s)sPM?  
static char THIS_FILE[] = __FILE__; .l=*R7~EU  
#endif 6//FZ:q  
#define MAX_KEY 100 *X l<aNNx  
#define CTRLBIT 0x04 /cC6qhkp%  
#define ALTBIT 0x02 #2R%H.*t  
#define SHIFTBIT 0x01 ;c- ]bhBB  
#pragma data_seg("shareddata") iEVA[xy=D  
HHOOK hHook =NULL; prEu9$:t  
UINT nHookCount =0; N@*wi"Q  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey tNuCxb-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT MJKl]&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )6:]o&bZ  
static int KeyCount =0; Cz@FZb8  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 2\63&C^  
#pragma data_seg() 04guud }  
HINSTANCE hins; 0 \Yx.\X,  
void VerifyWindow(); 4m~7 ~-h  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Sci4EGc  
//{{AFX_MSG_MAP(CHookApp)  Q A)9  
// NOTE - the ClassWizard will add and remove mapping macros here. Bf:tal6 -M  
// DO NOT EDIT what you see in these blocks of generated code! P% +or*  
//}}AFX_MSG_MAP noh|/sPMD  
END_MESSAGE_MAP() vDW&pF_eI>  
xw+<p  
CHookApp::CHookApp() gJPDNZ*6pk  
{ dmaqXsU8q  
 // TODO: add construction code here, G?1x+H;o5  
 // Place all significant initialization in InitInstance EARfbb"SG7  
} ,V33v<|wc  
&cu] vw  
CHookApp theApp; +t>*l>[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) GL 5^_`n  
{ n4WSV  
 BOOL bProcessed=FALSE; tCbr<Ug  
 if(HC_ACTION==nCode) P#[IUXtT  
 { kQwm"Z  
  if((lParam&0xc0000000)==0xc0000000){// Key up <+\k&W&Y|y  
   switch(wParam) EItxRHV5  
   { WbQhl sc:  
    case VK_MENU: D(qHf9  
     MaskBits&=~ALTBIT; 18.Y/nZAgQ  
     break; i$[,-4 v  
    case VK_CONTROL: ..jq[(;N  
     MaskBits&=~CTRLBIT; abICoP1zQ  
     break; dv^e 9b|  
    case VK_SHIFT: TwM1M["3  
     MaskBits&=~SHIFTBIT; Bw 3F7W~l  
     break; V;iL[  
    default: //judge the key and send message qSEB}1  
     break; &;ZC<?wS  
   } MUbhEau?  
   for(int index=0;index<MAX_KEY;index++){ PyC;f8n'(  
    if(hCallWnd[index]==NULL) 3VcT7y*{P  
     continue; DC|xilP1O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5jn$7iE`  
    { tLS<0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @A [)hk&(R  
     bProcessed=TRUE; _YH<YOrMh  
    } u?q&K|  
   } "H5&3sF2  
  } 7o;x (9  
  else if((lParam&0xc000ffff)==1){ //Key down Az9X#h.vf  
   switch(wParam) UvPp~N 7,  
   { uQ:Qb|  
    case VK_MENU: v[R_S  
     MaskBits|=ALTBIT; EkRdpiLB  
     break; $42Au2Jg  
    case VK_CONTROL: MxY50 ^}(  
     MaskBits|=CTRLBIT; C!!mOAhJ  
     break; tCWJSi`IJ  
    case VK_SHIFT: =LXvlt'Q34  
     MaskBits|=SHIFTBIT; ZJ^s}  
     break; }  c{Fa&  
    default: //judge the key and send message LIr(mB"Y0  
     break; X,>(Y8  
   } 'Z\{D*=V8  
   for(int index=0;index<MAX_KEY;index++) GS}0;x  
   { =MMCf0  
    if(hCallWnd[index]==NULL) ]KsGkAG  
     continue; (JevHdI*V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jo_o` j  
    { M|U';2hZN:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); xttYn ]T  
     bProcessed=TRUE; (tJ91SBl  
    } HKpD 2M  
   } DZJ eup?Z  
  } N%O[  
  if(!bProcessed){ q;p.wEbr4U  
   for(int index=0;index<MAX_KEY;index++){ -dl}_   
    if(hCallWnd[index]==NULL) f](I.lm:  
     continue; Y\.DQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) l#Yx TY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !2(.$}E  
   } bpGzTU  
  } 77``8,  
 } MM7"a?y)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); o1U}/y+R\  
} > 9o{(j  
7O:"~L  
BOOL InitHotkey() n9DbiL1{  
{ .XIr?>G  
 if(hHook!=NULL){ T\jAk+$Jo  
  nHookCount++; U>oW~Z  
  return TRUE; .U<F6I:<md  
 } }0Y`|H\v  
 else 9MT3T?IS  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #aa1<-&H  
  if(hHook!=NULL) cu<y8 :U<  
   nHookCount++; 'v\j.j/i  
  return (hHook!=NULL); q=njKC  
} :xM}gPj"  
BOOL UnInit() A9t8`|1"%H  
{ z<t>hzl 7  
 if(nHookCount>1){ +SyUWoM  
  nHookCount--; 0F1u W>D1  
  return TRUE; ":V%(c  
 } %w$ mSG  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _@~PL>g"p  
 if(unhooked==TRUE){ +ZX .1[O  
  nHookCount=0; nz[ m3]  
  hHook=NULL; +|9f%f6vp  
 } $5x]%1 R  
 return unhooked; /,X7.t_-  
} :b5XKv^  
e]+7DE  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1#]B^D  
{ '^DUq?E4  
 BOOL bAdded=FALSE; "ct58Y@   
 for(int index=0;index<MAX_KEY;index++){ 5*Btb#:  
  if(hCallWnd[index]==0){ PGkCOmq   
   hCallWnd[index]=hWnd; K>$qun?5  
   HotKey[index]=cKey; l77'Lne  
   HotKeyMask[index]=cMask; xdqK.Z%  
   bAdded=TRUE; FllX za)  
   KeyCount++; >4M<W4  
   break; ,WGc7NN`  
  } 6<PW./rk:  
 } ;P8(Zf3wJb  
 return bAdded; <S&]$?`{Wi  
} >8(jW  
u-:MVEm  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .lr5!Stb  
{ %mu>-hac  
 BOOL bRemoved=FALSE; M9DgO4xl  
 for(int index=0;index<MAX_KEY;index++){ R+uw/LG  
  if(hCallWnd[index]==hWnd){ D7gHE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `,P >mp)uU  
    hCallWnd[index]=NULL; ]w-.|vx  
    HotKey[index]=0; -x5F;d}  
    HotKeyMask[index]=0; }jiK3?e  
    bRemoved=TRUE; >4c`UW  
    KeyCount--; fbV@=(y?  
    break; ^e%k~B^  
   } <]'|$8&jY  
  } {Zl4C;c  
 } wPgDy  
 return bRemoved; -;/ Y  
} p#=;)1  
cJ/4G l  
void VerifyWindow() U=DEV7E  
{ d- kZt@DL=  
 for(int i=0;i<MAX_KEY;i++){ abSq2*5K  
  if(hCallWnd!=NULL){ ^vaL8+  
   if(!IsWindow(hCallWnd)){ yquAr$L!  
    hCallWnd=NULL; @,e8t BL  
    HotKey=0; q:8\ e  
    HotKeyMask=0; ZB0+GG\  
    KeyCount--; &F`L}#oL&  
   } =f `=@]  
  } AqqHD=Yp  
 } &mdB\Y?^  
} ckWkZ 78\  
O8y9dX-2  
BOOL CHookApp::InitInstance() }^9paU  
{ o3\,gzJ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); x?=B\8m  
 hins=AfxGetInstanceHandle(); qRl/Sl#F  
 InitHotkey(); :q;R6-|.  
 return CWinApp::InitInstance(); e96#2A5f  
} }Aw47;5q;  
])UwC-l  
int CHookApp::ExitInstance() h1c{?xH2r  
{ 8t=3  
 VerifyWindow(); yKlU6t&` G  
 UnInit(); .l=p[BI  
 return CWinApp::ExitInstance(); +`Fb_m)f  
} 2qXo{C3  
D:)~%wu Lt  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file rei5{PC  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8,y{q9O  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ x G^f  
#if _MSC_VER > 1000 Vmtzig3w[  
#pragma once o$t &MST?i  
#endif // _MSC_VER > 1000 Uuz?8/w}#  
(7L/eDMT  
class CCaptureDlg : public CDialog ^}hZ'<PK  
{ L20rv:W$h  
 // Construction b|6!EGh  
 public: 1J&#&\,f&  
  BOOL bTray; g<\>; }e  
  BOOL bRegistered; !-ZP*V3}h  
  BOOL RegisterHotkey(); phmVkV2a;#  
  UCHAR cKey; aP_3C_  
  UCHAR cMask; 0Nt%YP  
  void DeleteIcon(); E[ 0Sst x  
  void AddIcon(); [aHlu[,  
  UINT nCount; _0m}z%rI  
  void SaveBmp(); NA\x<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor oc:x&`j  
  // Dialog Data { Hr>X  
  //{{AFX_DATA(CCaptureDlg) 2^J/6R$  
  enum { IDD = IDD_CAPTURE_DIALOG }; NN11}E6  
  CComboBox m_Key; %UBPoq  
  BOOL m_bControl; J+i X,X  
  BOOL m_bAlt; F'XlJ M  
  BOOL m_bShift; ~T7\8K+ $  
  CString m_Path; w~]} acP  
  CString m_Number; Z@u ;Z[@  
  //}}AFX_DATA Yx!n*+:J  
  // ClassWizard generated virtual function overrides |veBq0U  
  //{{AFX_VIRTUAL(CCaptureDlg) 6# R;HbkO  
 public: 418gcg6)  
  virtual BOOL PreTranslateMessage(MSG* pMsg); }^Z< dbt  
 protected: "(N-h\7Ex9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H&9wSG`  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 4">84,-N  
  //}}AFX_VIRTUAL >|(WS.n3C  
  // Implementation *x5o=)Y  
 protected: 7;~ 2e  
  HICON m_hIcon; pc^E'h:  
  // Generated message map functions /1U,+g^O>  
  //{{AFX_MSG(CCaptureDlg) RR8U Cv  
  virtual BOOL OnInitDialog(); 3EAX]  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5t TLMZ`o  
  afx_msg void OnPaint(); eUYG96Jw  
  afx_msg HCURSOR OnQueryDragIcon(); N%: D8\qx  
  virtual void OnCancel(); {XyG1  
  afx_msg void OnAbout(); *%;6P5n%  
  afx_msg void OnBrowse(); Ogn,1nm%  
  afx_msg void OnChange(); 0GF%~6  
 //}}AFX_MSG 6CCZda@  
 DECLARE_MESSAGE_MAP() Idt@Hk5<&  
}; iFY]0@yt  
#endif Tm0?[[3hC  
m21QN9(i%  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file zjzqKdy}F  
#include "stdafx.h" _$~ex ~v  
#include "Capture.h" [<,0A]m   
#include "CaptureDlg.h" 6="M0%  
#include <windowsx.h> }x>}:"P;W  
#pragma comment(lib,"hook.lib") vr5<LNCLQ  
#ifdef _DEBUG 3ZLr"O1l)  
#define new DEBUG_NEW # r2$ZCo3o  
#undef THIS_FILE a>#d=.  
static char THIS_FILE[] = __FILE__; i+kFL$N  
#endif O(b"F? w  
#define IDM_SHELL WM_USER+1 Nu>sp,|A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o%y+Y;|?J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `\4RFr$  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P TfN+  
class CAboutDlg : public CDialog +y tT)S  
{ \3J+OY  
 public: ~7FEY0/  
  CAboutDlg(); k 2 mkOb  
  // Dialog Data n3-GnVC][  
  //{{AFX_DATA(CAboutDlg) ^^20vwq  
  enum { IDD = IDD_ABOUTBOX }; 'M]CZ}  
  //}}AFX_DATA i!/h3%=  
  // ClassWizard generated virtual function overrides !;BZ#tF&  
  //{{AFX_VIRTUAL(CAboutDlg) BZnp #}f  
 protected: rF <iWM=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U)IsTk~}O  
  //}}AFX_VIRTUAL 0`aHwt/F  
  // Implementation (@N~ j&  
 protected: +?J_6Mo@X  
  //{{AFX_MSG(CAboutDlg) fS8XuT  
  //}}AFX_MSG tIgCF?  
  DECLARE_MESSAGE_MAP() HZ[68T[8b  
}; `&"H* Ie  
Rz])wBv e  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) S]#=ES'^/  
{ ~]m@k'n  
 //{{AFX_DATA_INIT(CAboutDlg) +w_MSj#P  
 //}}AFX_DATA_INIT "OlI-^y  
} ^HOwN<}`#  
VygXhh^7\  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) iPtm@f,bI  
{ .yHHogbt  
 CDialog::DoDataExchange(pDX); KqG$zC^N  
 //{{AFX_DATA_MAP(CAboutDlg) .aAw7LW  
 //}}AFX_DATA_MAP <W^XSk  
} |n-a\  
JXZ:Wg  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }y -AoG  
 //{{AFX_MSG_MAP(CAboutDlg) J T0,Z  
 // No message handlers s K$Sar  
 //}}AFX_MSG_MAP tZc.%TU  
END_MESSAGE_MAP() zN 729wK  
l,FG:"`Z@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) G+ \~rl  
: CDialog(CCaptureDlg::IDD, pParent) .-1{,o/&Q  
{ ! A ydhe  
 //{{AFX_DATA_INIT(CCaptureDlg) =>9.@`.  
  m_bControl = FALSE; tr67ofld|  
  m_bAlt = FALSE; /n<Ncf  
  m_bShift = FALSE; a_#eGe>  
  m_Path = _T("c:\\"); Z:o' +oh  
  m_Number = _T("0 picture captured."); szM=U$jKq  
  nCount=0; *F4G qX3  
  bRegistered=FALSE; '=G<)z@k  
  bTray=FALSE; uBL~AC3>O  
 //}}AFX_DATA_INIT Aaw:B?4)  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 oT5rX ,8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); iTBhLg,  
} t BXsWY{  
m#}{"d&J  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) hcqmjqJ  
{ n*8RYm)?  
 CDialog::DoDataExchange(pDX); kHIQ/\3?Q  
 //{{AFX_DATA_MAP(CCaptureDlg) b<8J;u<  
  DDX_Control(pDX, IDC_KEY, m_Key); `5 v51TpH  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); p=5H^E m1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); BrH`:Dw  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); @BQB NGR1  
  DDX_Text(pDX, IDC_PATH, m_Path); Jtk.v49Ad>  
  DDX_Text(pDX, IDC_NUMBER, m_Number); EpS8,[w  
 //}}AFX_DATA_MAP e^fKatI1  
} Q9'p3"yoE  
"OAZ<  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) O=?X%m #  
//{{AFX_MSG_MAP(CCaptureDlg) {,mRMDEy  
 ON_WM_SYSCOMMAND() 2 n+XML  
 ON_WM_PAINT() )cmLo0`$  
 ON_WM_QUERYDRAGICON() W2LblZE!  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) o%JIJ7M  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) _w,0wn9N$  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 2B?i2[a,  
//}}AFX_MSG_MAP -v+^x`HR  
END_MESSAGE_MAP() tS\NO@E_Jh  
 YaZ "&i  
BOOL CCaptureDlg::OnInitDialog() g[+Q~/yq  
{ 4 AmF^H  
 CDialog::OnInitDialog(); WsDe0F  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >u#VHaB  
 ASSERT(IDM_ABOUTBOX < 0xF000); E&tmWOMj>  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]mT} \b  
 if (pSysMenu != NULL) :Ty*i  
 { Q>c6ouuJ  
  CString strAboutMenu; >"{zrwNq  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Gv3Fg[MA@c  
  if (!strAboutMenu.IsEmpty()) [cAg'R6  
  { SpiC0  
   pSysMenu->AppendMenu(MF_SEPARATOR); Sg~A'dG  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 05LQh  
  } ]BBgU[O) !  
 } ffd 3QQ  
 SetIcon(m_hIcon, TRUE); // Set big icon :%oj'm44!  
 SetIcon(m_hIcon, FALSE); // Set small icon +,lD_{}_  
 m_Key.SetCurSel(0); U VT8TN-T  
 RegisterHotkey(); 2wd(0K}b  
 CMenu* pMenu=GetSystemMenu(FALSE); _,^sI%  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $$@Tgkg?o  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); LsXYvX  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 8~i@7~ J  
 return TRUE; // return TRUE unless you set the focus to a control ^4"_I   
} N5\<w>  
Lj H];=R  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) L*z;-,  
{ W5p}oN  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 7XNfH@  
 { D1f=f88/}  
  CAboutDlg dlgAbout; CbZ1<r" /  
  dlgAbout.DoModal(); !cZsIcIe  
 } }=U\v'%m  
 else v!,O7XGH~  
 { j!s&yHE1  
  CDialog::OnSysCommand(nID, lParam); ",}VB8K  
 } %_ ~[+ ~#  
} t]x HM  
CqoL5qt  
void CCaptureDlg::OnPaint() $3L7R  
{ MWl@smRh  
 if (IsIconic()) Z|W=.RdA;  
 { Bg`b*(Q  
  CPaintDC dc(this); // device context for painting u7mj  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Pc3u`QL?  
  // Center icon in client rectangle <n>< A+D  
  int cxIcon = GetSystemMetrics(SM_CXICON); HiC\U%We  
  int cyIcon = GetSystemMetrics(SM_CYICON); 6"DvdJ0MB  
  CRect rect; \c]/4C +/  
  GetClientRect(&rect); %VMazlM15  
  int x = (rect.Width() - cxIcon + 1) / 2; ?d %_o@  
  int y = (rect.Height() - cyIcon + 1) / 2; NB^.$ 3 9n  
  // Draw the icon sJr$[?  
  dc.DrawIcon(x, y, m_hIcon); 8{ep`$(K@  
 } vmoqsdZ/  
 else 4MM#\  
 { TX>;2S3q   
  CDialog::OnPaint(); =y':VIVJC  
 } V><P`  
} {?C7BClB  
'~@WJKk  
HCURSOR CCaptureDlg::OnQueryDragIcon() l- X|3,  
{ 3]!(^N>V  
 return (HCURSOR) m_hIcon; \z_@.Jw{  
} ?*T`a oB  
a%AU9?/q#  
void CCaptureDlg::OnCancel() -B_dE-l,  
{ ]8mBFr5E9  
 if(bTray) p?}Rolk7  
  DeleteIcon(); _])1P?.  
  CDialog::OnCancel(); PY^Yx$t9  
} @1>83-p"X  
Kg.E~  
void CCaptureDlg::OnAbout() nhIITfJJ  
{ =v_ju;C=  
 CAboutDlg dlg; 0nv3JX^l]  
 dlg.DoModal(); ^)SvH  
} ^|8cS0dK]Q  
6@T_1  
void CCaptureDlg::OnBrowse() 9u:MF0:W  
{ 1D*e u  
 CString str; -F*j`  
 BROWSEINFO bi; &o?pZ(\C  
 char name[MAX_PATH]; >Mn"k\j4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ALKhZFuz  
 bi.hwndOwner=GetSafeHwnd(); LJBoS]~  
 bi.pszDisplayName=name; N8KHNTb-M  
 bi.lpszTitle="Select folder"; ,@P3!|  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; =^{^KHzIl3  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); o&>0 pc  
 if(idl==NULL) sx/g5 ?zh  
  return; LIR2B"3F  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \,?yj  
 str.ReleaseBuffer(); cd:O@)i  
 m_Path=str; K46mE   
 if(str.GetAt(str.GetLength()-1)!='\\') sT/pA^rnnR  
  m_Path+="\\"; i G<|3I  
 UpdateData(FALSE); ncWASw`  
} H\O|Y@uVr  
au GN~"n^  
void CCaptureDlg::SaveBmp() {2V=BDS|?K  
{ *{C)o0D  
 CDC dc; #Uudx~b  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); $CXqkK<6  
 CBitmap bm; KYlWV<sR  
 int Width=GetSystemMetrics(SM_CXSCREEN); <1hwXo  
 int Height=GetSystemMetrics(SM_CYSCREEN); M14pg0Q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zis-}K<   
 CDC tdc; u52@{@Ad  
 tdc.CreateCompatibleDC(&dc); (=p}b:Z  
 CBitmap*pOld=tdc.SelectObject(&bm); YpuA,r;"  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); F9d][ P@@  
 tdc.SelectObject(pOld); fA|'}(kH  
 BITMAP btm; c>]_,Br~  
 bm.GetBitmap(&btm); FCI38?`%  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; | WDX@Q  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); E6n;_{Se/S  
 BITMAPINFOHEADER bih; $bMeL7CN  
 bih.biBitCount=btm.bmBitsPixel; A@`C<O ^  
 bih.biClrImportant=0; ~>{<r{H"S  
 bih.biClrUsed=0; ==IL63  
 bih.biCompression=0; "i#!  
 bih.biHeight=btm.bmHeight; 1P6~IZVN  
 bih.biPlanes=1; @ cv`}k  
 bih.biSize=sizeof(BITMAPINFOHEADER); J_`.w  
 bih.biSizeImage=size; S>**hM U%  
 bih.biWidth=btm.bmWidth; 654PW9{(  
 bih.biXPelsPerMeter=0; O" T1=4  
 bih.biYPelsPerMeter=0; Q,jlKgB 5:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); R4{}ZT  
 static int filecount=0; /oWB7l&  
 CString name; _&yQW&vH#  
 name.Format("pict%04d.bmp",filecount++); GZO,]%z  
 name=m_Path+name; slw^BK3t  
 BITMAPFILEHEADER bfh; W&rjJZY6  
 bfh.bfReserved1=bfh.bfReserved2=0; m.lNKIknQ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ,$CZ (GQ  
 bfh.bfSize=54+size; fDqlN`P@  
 bfh.bfOffBits=54; J| 3CG;+  
 CFile bf; =#1/<q)L  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ -[+FVvS  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));  vlE#z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `GH6$\:  
  bf.WriteHuge(lpData,size); bZa?h.IF  
  bf.Close(); E4 JS   
  nCount++; Ndx='j0  
 } v3`J~,V<  
 GlobalFreePtr(lpData); Z^#7&Pv0  
 if(nCount==1) [;};qQ-C2  
  m_Number.Format("%d picture captured.",nCount); k9Yr&8B  
 else t$s)S>  
  m_Number.Format("%d pictures captured.",nCount); 3{,Mpb@  
  UpdateData(FALSE); /GCSC8T  
} en#W<"_"  
23+>K  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) k%uRG_  
{ SkN^ytKE  
 if(pMsg -> message == WM_KEYDOWN) e?F r/n  
 { {*tewF)|  
  if(pMsg -> wParam == VK_ESCAPE) yUBic~S  
   return TRUE; R:OoQ^c  
  if(pMsg -> wParam == VK_RETURN) QULrE+@  
   return TRUE; ;Q-sie(#  
 } o$2fML  
 return CDialog::PreTranslateMessage(pMsg); Qg1LT8  
} .\< \J|3  
.bew,92  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %lEPFp  
{ x4fLe5xv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){  M3u[E  
  SaveBmp(); uy7)9w  
  return FALSE; ~H?RHYP~  
} Ho*S >Y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ qC IZW  
 CMenu pop; SyTcp?H  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); sp'q=^t  
 CMenu*pMenu=pop.GetSubMenu(0); Jd/ 5Kx  
 pMenu->SetDefaultItem(ID_EXITICON); ]uj H7T  
 CPoint pt; 0p&:9|'z  
 GetCursorPos(&pt); i_f"?X;D  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 7dN]OUdi  
 if(id==ID_EXITICON) t+p-,ey^@  
  DeleteIcon(); vPpbm  
 else if(id==ID_EXIT) hnH:G`[F  
  OnCancel(); SlsMMD  
 return FALSE; 9OP d'f  
} nn5S7!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); vy6NH5Q  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ;I]TM#qGF  
 AddIcon(); rJD>]3D5p  
 return res; ,O $F`0>9A  
} m[]p IXc(  
T%- F,i  
void CCaptureDlg::AddIcon() 2>?GD@GE  
{ ^:LF  
 NOTIFYICONDATA data; b&V=X{V4  
 data.cbSize=sizeof(NOTIFYICONDATA); Y"G$^3% (]  
 CString tip; 5|Vb)QBv%  
 tip.LoadString(IDS_ICONTIP); &UQKZ.  
 data.hIcon=GetIcon(0); _U/etlDTO  
 data.hWnd=GetSafeHwnd(); V|<qO-#.  
 strcpy(data.szTip,tip); l AE$HP'o  
 data.uCallbackMessage=IDM_SHELL; d ID] {  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >PL/>   
 data.uID=98; R# mZYg  
 Shell_NotifyIcon(NIM_ADD,&data); Ff%m.A8d,4  
 ShowWindow(SW_HIDE); dax|4R  
 bTray=TRUE; "yL&?B"9@  
} 5N`g  
/>.&  
void CCaptureDlg::DeleteIcon() P@ 1D  
{ 9`-ofwr'|  
 NOTIFYICONDATA data; nolTvqMT  
 data.cbSize=sizeof(NOTIFYICONDATA); bbA+ZLZJn  
 data.hWnd=GetSafeHwnd(); [Z~>7ayF+)  
 data.uID=98; ;bkS0Vmg  
 Shell_NotifyIcon(NIM_DELETE,&data); >3 qy'lm  
 ShowWindow(SW_SHOW); tAbIT;>  
 SetForegroundWindow(); _mA[^G=gY  
 ShowWindow(SW_SHOWNORMAL); kd!f/'E!  
 bTray=FALSE;  nPvR  
} klv^310  
Ya304Pjd  
void CCaptureDlg::OnChange() x/bO;9E%U4  
{ $P4hNb  
 RegisterHotkey(); ax'Dp{Q  
} &{ntx~Eq  
=xai 7iM  
BOOL CCaptureDlg::RegisterHotkey() - uliND  
{ TS-m^Y'R  
 UpdateData(); 93[`1_q7\  
 UCHAR mask=0; N[dhNK"  
 UCHAR key=0; V@e0VV3yx%  
 if(m_bControl) tv\P$|LV`8  
  mask|=4; gHYYxhW$  
 if(m_bAlt) _EjS(.e/=  
  mask|=2; [G t|Qp[   
 if(m_bShift) H)t8d_^|j  
  mask|=1; #HM0s~^w&  
  key=Key_Table[m_Key.GetCurSel()]; p.8G]pS  
 if(bRegistered){ *Fp )/Ih  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); /!jn$4fd:  
  bRegistered=FALSE; yd`.Rb&V  
 } 7&|fD{:4U  
 cMask=mask; dwB-WF%k  
 cKey=key; 6i{W=$ RQ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);  =Lp0i9c  
 return bRegistered; Q9FY.KUM  
} E xY ~.  
}g>&l.2X  
  四、小结 ]UFf-  
&d9";V"E  
  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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