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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: ${hyNt  
  xClRO,-  
  一、实现方法 Qm.z@DwFM{  
-|m$YrzG  
  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: e7@li<3>d  
C(-[ Y!  
#pragma data_seg("shareddata") V~OUE]]Q  
HHOOK hHook =NULL; //钩子句柄 6xQ"bFm  
UINT nHookCount =0; //挂接的程序数目 `nT?6gy  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $brKl8P  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?VwK2w$&={  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 7{n\y l?  
static int KeyCount =0; S?*^>Y-e;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 MWBXs7 5I  
#pragma data_seg() EVR! @6@  
mR"uhm}q  
  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。 a*Rz<08  
za,6 du6  
  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.\6sC  
kr^0% A  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR o g_Ri$x8  
cKey,UCHAR cMask) D899gGe  
{ ~\2;i]|  
 BOOL bAdded=FALSE; !0`lu_ZN  
 for(int index=0;index<MAX_KEY;index++){ wi>DZkR  
  if(hCallWnd[index]==0){ sNL+F  
   hCallWnd[index]=hWnd; [!W5}=^H  
   HotKey[index]=cKey; x@h tx?   
   HotKeyMask[index]=cMask; LyIKP$t  
   bAdded=TRUE; >gr<^$  
   KeyCount++; M3ZOk<O<R  
   break; FtE90=$  
  } -(!uC +BZX  
 } veV_be{i  
 return bAdded; ^[#=L4  
} hje! w`  
//删除热键 Z%#^xCz;w>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8+ov(B;(  
{ GjEqU;XBi  
 BOOL bRemoved=FALSE; C ck#Y  
 for(int index=0;index<MAX_KEY;index++){ Hj2<ZL  
  if(hCallWnd[index]==hWnd){ @a0Q0M  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &I%IaNco  
    hCallWnd[index]=NULL; /N>} 4Ay  
    HotKey[index]=0; vHS2q >  
    HotKeyMask[index]=0; . @@an;C  
    bRemoved=TRUE; Y17hOKc`  
    KeyCount--; (Ux [[  
    break; Apmw6cc  
   } %yfE7UPS]  
  } RpYcD  
 } 19p8B&  
 return bRemoved; wqP2Gw7jh6  
} ;,k=<]  
/[%w*v*'  
Tpb"uBiXoo  
  DLL中的钩子函数如下: "kU]  
Kk=LXmL2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;g+]klR!  
{ QjJfE<h  
 BOOL bProcessed=FALSE; Vc _:*  
 if(HC_ACTION==nCode) b1xpz1  
 { tb,9a!?  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 E=]]b;u-n  
   switch(wParam) >'b=YlUL  
   {  \x(^]/@  
    case VK_MENU: lI6W$V\,  
     MaskBits&=~ALTBIT; hO3 {  
     break; rEM#D]k  
    case VK_CONTROL: CW p#^1F  
     MaskBits&=~CTRLBIT; [1SMg$@<  
     break; FY4T(4#  
    case VK_SHIFT: G>K@AW #  
     MaskBits&=~SHIFTBIT; 6e.[,-eU  
     break; [EOVw%R  
    default: //judge the key and send message U*\17YU6h  
     break; &I/qG`W  
   } e)b%`ntF  
   for(int index=0;index<MAX_KEY;index++){ r[pF^y0   
    if(hCallWnd[index]==NULL) {$33B'wk  
     continue; y`S o&:1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~KPv7WfG  
    { n Q-mmY>#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )+EN$*H  
     bProcessed=TRUE; DpvrMI~I_  
    } (%'9CfPx  
   } <cj{Qk  
  } ]iVLHVqz  
  else if((lParam&0xc000ffff)==1){ //有键按下 I2[]A,f ,  
   switch(wParam) =wrP:wYF  
   { )];aIA$  
    case VK_MENU: jDX>izg;V  
     MaskBits|=ALTBIT; (>7>3  
     break; -c+]Wm"\  
    case VK_CONTROL: Ej"u1F14J  
     MaskBits|=CTRLBIT; %u!b& 5]e  
     break; !%[S49s  
    case VK_SHIFT: suVmg-d  
     MaskBits|=SHIFTBIT; =J/FJb  
     break; r4Q|5kT*i  
    default: //judge the key and send message  3+U]?7t  
     break; }r3~rG<D71  
   } =w%Oa<  
   for(int index=0;index<MAX_KEY;index++){ Bp_wnd  
    if(hCallWnd[index]==NULL) eB]R3j{  
     continue; +@:L|uFU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `hUHel;6  
    { *9 D!A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /.Q4~Hw%}  
     bProcessed=TRUE; ,:GN;sIXg  
    } N+g@8Q2s;5  
   } #/70!+J_UF  
  } :dwt1>  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |He=LQ }0  
   for(int index=0;index<MAX_KEY;index++){ tSHFm-q`  
    if(hCallWnd[index]==NULL) RE"^ )-  
     continue; 7wVH8^|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~ ?^/u8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); y7lWeBnC  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 tef^ShF]  
   } $B .Qc!m  
  } vhgLcrn  
 } :dnJY%/q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); uY#TEjGh]  
} }NCL>l;q  
]A+o>#n}x  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: `I;F$`\  
] d?x$>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zm#nV Y`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zT9JBMNE:  
2A:,;~UH  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 1hmc,c  
Da1aI]{I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l67Jl"v  
{ k%81f'H  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) (< c7<_-H  
 { `V!>J 1x  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 o l ({AYB  
  SaveBmp(); N#z~  
  return FALSE; WF2-$`x  
 } q1{H~VSn"  
 …… //其它处理及默认处理 K[?Xm"4  
} 5.0e~zlM -  
[(mlv42"  
G}zZQy  
  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。 *_-'/i  
ko\):DN  
  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。 q_fam,9  
gAbD7SE  
  二、编程步骤 5Fw - d  
2N [=  
  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"; _^ |2}t  
A[N{  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; [ .,>wo~  
j}JZ  
  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; ,. EBOUW^  
DBH#)4do@  
  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; lCT{v@pp  
~/#1G.H  
  5、 添加代码,编译运行程序。 :#t*K6dz  
9$*s8}|  
三、程序代码 t0E51Ic@  
5FeFN)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL m_NCx]#e   
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) hGTV;eU  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]$iqa"{  
#if _MSC_VER > 1000 :l u5Uu~  
#pragma once [:EvTY  
#endif // _MSC_VER > 1000 $.E6S<(h  
#ifndef __AFXWIN_H__ R{hf9R,  
#error include 'stdafx.h' before including this file for PCH Gu0 ,)jy\  
#endif bZwnaM4"F  
#include "resource.h" // main symbols KW3+luI6  
class CHookApp : public CWinApp 2tQ`/!m>v$  
{ fz_nsVD  
 public: :$3oFN*g  
  CHookApp(); V A^l+Z,d  
  // Overrides UK[v6".^h  
  // ClassWizard generated virtual function overrides F\JUx L@8  
  //{{AFX_VIRTUAL(CHookApp) uKr1Z2  
 public: } ?@5W,  
  virtual BOOL InitInstance(); 4Ft1@  
  virtual int ExitInstance(); , \)a_@@k  
  //}}AFX_VIRTUAL 9"{W,'r&d  
  //{{AFX_MSG(CHookApp) @ EuFJ=h  
  // NOTE - the ClassWizard will add and remove member functions here. uzr\oj+>  
  // DO NOT EDIT what you see in these blocks of generated code ! V&{MQWy  
  //}}AFX_MSG a}yXC<}$  
  DECLARE_MESSAGE_MAP() IZ,oM!Y  
}; YPDf Y<?v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); l,|%7-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); giY80!GX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >p\e 0n  
BOOL InitHotkey(); K,ej%Vtz  
BOOL UnInit(); hf6f.Z  
#endif $^/0<i$   
$rB3m~c|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. knp>m,w  
#include "stdafx.h" p/6zEZ*  
#include "hook.h" PyC0Q\$%  
#include <windowsx.h> eU+ {*YJg  
#ifdef _DEBUG y^>Q/H\  
#define new DEBUG_NEW F0Jx(  
#undef THIS_FILE vsB*rP=  
static char THIS_FILE[] = __FILE__; t0&@h\K  
#endif koG{ |elgB  
#define MAX_KEY 100 ,U,By~s  
#define CTRLBIT 0x04 ed 59B)?l  
#define ALTBIT 0x02 )KSoq/  
#define SHIFTBIT 0x01 ~`8hwR1&z  
#pragma data_seg("shareddata") 3L>IX8_   
HHOOK hHook =NULL; '=E9En#@  
UINT nHookCount =0; ,Z9>h[JF  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey d;[u8t  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT W[bmzvJ_X  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey kK>Xrj6  
static int KeyCount =0; q-$`k  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift qeL pXe0c  
#pragma data_seg() B0}~G(t(  
HINSTANCE hins; Lz9#A.  
void VerifyWindow(); JNI>VP[c  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) AbwbAm+  
//{{AFX_MSG_MAP(CHookApp) fN%jJ-[d  
// NOTE - the ClassWizard will add and remove mapping macros here. qZk'tRv  
// DO NOT EDIT what you see in these blocks of generated code! FjfN3#qlg  
//}}AFX_MSG_MAP \kIMDg3}  
END_MESSAGE_MAP() LHCsk{3  
_o6G6e,  
CHookApp::CHookApp() Lm*VN~2  
{ f'(l&/4z{  
 // TODO: add construction code here, q z&+=d@  
 // Place all significant initialization in InitInstance XE3aXK'R  
} E|EgB33S  
4'pS*v  
CHookApp theApp; Ds8 EMtS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) l.)}t)my}  
{ yqOuX>m1c  
 BOOL bProcessed=FALSE; b;mSQ4+  
 if(HC_ACTION==nCode) Tpp&  
 { )ukpJ z""  
  if((lParam&0xc0000000)==0xc0000000){// Key up qOV[TP,  
   switch(wParam) zdun,`6  
   { @ez Tbc3  
    case VK_MENU: |+IZS/W"  
     MaskBits&=~ALTBIT; ^nK7i[yF.k  
     break; Bvjl-$m!v  
    case VK_CONTROL: xG&SX#[2  
     MaskBits&=~CTRLBIT; V,v[y\  
     break; Px@/Q  
    case VK_SHIFT: bF}V4"d,B3  
     MaskBits&=~SHIFTBIT; `\| ssC8u  
     break; T5Eseesp  
    default: //judge the key and send message g+8hp@a  
     break; :VmHfOO  
   } OK|qv[  
   for(int index=0;index<MAX_KEY;index++){ ZUXr!v/R:1  
    if(hCallWnd[index]==NULL) JOn yrks  
     continue; "O>n@Q|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I,6/21kO  
    { + A_J1iJ<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,38Eq`5&W  
     bProcessed=TRUE; RuW!*LI  
    } u~zs* qp  
   } 9?T{}| ?  
  } ~vdkFc(8B  
  else if((lParam&0xc000ffff)==1){ //Key down /nx'Z0&+X  
   switch(wParam) a@d=>CT$  
   { wRNroQ  
    case VK_MENU: 3B0lb "e  
     MaskBits|=ALTBIT; 4IdT'  
     break; i=FQGWAUu  
    case VK_CONTROL: 9X<OJT;3J  
     MaskBits|=CTRLBIT; Ma-\^S=  
     break; )o _j]K+xI  
    case VK_SHIFT: "v*8_El  
     MaskBits|=SHIFTBIT; :B *}^g  
     break; k5d\ w@G"~  
    default: //judge the key and send message :q##fG 'm/  
     break; wgeNs9L  
   } XV>JD/K2  
   for(int index=0;index<MAX_KEY;index++) %5Kq^]q;Y  
   { >"X\>M`"  
    if(hCallWnd[index]==NULL) .] 4W!])9  
     continue; q]& .#&h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JwnAW}=  
    { A^fjfa);V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t-%Q`V=[  
     bProcessed=TRUE; +';>=hha  
    } 1r[@(c0  
   } I XA>`D  
  } ;a"q'5+Ne  
  if(!bProcessed){ 0CvsvUN@  
   for(int index=0;index<MAX_KEY;index++){ ]bCq=6ZKR  
    if(hCallWnd[index]==NULL) F-Z%6O,2  
     continue; P%pp )BS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _K2?YY(#>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Zwt;d5U  
   } 8am`6;O:!  
  } 9W*+SlH@ !  
 } 3ucP(Ex@tg  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Sywu=b  
} vP!GJX &n5  
7;`o( [N  
BOOL InitHotkey() ytEC   
{ dHnR_.  
 if(hHook!=NULL){ W><Zn=G4)b  
  nHookCount++; ?q2j3e[>  
  return TRUE; RH0>ZZR  
 } :)f7A7:;  
 else Kz8:UG(  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); xk~IN%\  
  if(hHook!=NULL) Upl6:xYrG  
   nHookCount++; 0:Xxl76v4  
  return (hHook!=NULL); 6+rlXmd  
} !X >=l  
BOOL UnInit() `WEZ"5n  
{ tU wRE|_  
 if(nHookCount>1){ Huw\&E  
  nHookCount--; 3{% LS"c  
  return TRUE; A?5E2T1L%.  
 } :S@1  
 BOOL unhooked = UnhookWindowsHookEx(hHook); bte~c  
 if(unhooked==TRUE){ UUo;`rkT  
  nHookCount=0; ;.s l*q1A  
  hHook=NULL; }0 hL~i  
 } >M!xiQX  
 return unhooked; 2],_^XBvB  
} gxPx&Z6jF  
\/7i-B]G7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Gm`}(;(A  
{  1iT\df  
 BOOL bAdded=FALSE; wu<])&F  
 for(int index=0;index<MAX_KEY;index++){ iJFs0?*  
  if(hCallWnd[index]==0){ S/vf'gj  
   hCallWnd[index]=hWnd; rI$`9d  
   HotKey[index]=cKey; Nb2Qp K  
   HotKeyMask[index]=cMask; &}mw'_ I  
   bAdded=TRUE; C8N{l:1f]  
   KeyCount++; ylf[/='0K  
   break; NBh%:tu7M  
  } PHg48Y"Nd  
 } 0XwHP{XaO  
 return bAdded; z!QDTIb  
} XALI<ZY  
"i.r@<)S  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) SQsSa1  
{ M/D)".;  
 BOOL bRemoved=FALSE; wCs3:@UH  
 for(int index=0;index<MAX_KEY;index++){ C`rLj5E%  
  if(hCallWnd[index]==hWnd){ $m1<i?'m  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :Br5a34q  
    hCallWnd[index]=NULL; OkAK  
    HotKey[index]=0; $$i. O}  
    HotKeyMask[index]=0; ~pk(L[G  
    bRemoved=TRUE; j83? m  
    KeyCount--; <q)4la  
    break; F1;lQA*7K.  
   }  , iNv'  
  } y #f QPR  
 } \2[<XG(^  
 return bRemoved; )|j[uh6w o  
} "\"DCDKmG  
:qhpL-ER  
void VerifyWindow() +@9gkPQQ-@  
{ foF19_2 ,  
 for(int i=0;i<MAX_KEY;i++){ w"m+~).U  
  if(hCallWnd!=NULL){ + j+5ud`  
   if(!IsWindow(hCallWnd)){ 9CGNn+~YI  
    hCallWnd=NULL; e;bYaM4 UX  
    HotKey=0; dBsX*}C  
    HotKeyMask=0; S|V4[ssB  
    KeyCount--; seFGJfN\?f  
   } ,:Jus  
  } EqiFy"H  
 } ,y`CRlr:  
} ,ea^,H6  
-F&U  
BOOL CHookApp::InitInstance() [,EpN{l  
{ }TRAw#h  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !"Yj|Nu6  
 hins=AfxGetInstanceHandle(); N(6|yZ<J3M  
 InitHotkey(); Th[f9H%  
 return CWinApp::InitInstance(); s>_V   
} [sV"ws  
@tohNO>  
int CHookApp::ExitInstance() ~\p]~qQ\K  
{ l} ^3fQXI  
 VerifyWindow(); a ?} .Fs  
 UnInit(); W+wA_s2&D  
 return CWinApp::ExitInstance(); 'k;4j|<  
} ^VW PdH/Fe  
@[<nQZw:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file K`&oC8p  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) O-]mebTvw  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ <tpmUA[]  
#if _MSC_VER > 1000 N qHy%'R  
#pragma once ?SQE5Z  
#endif // _MSC_VER > 1000 #?MY&hdU9  
 mvW%  
class CCaptureDlg : public CDialog exh/CK4;  
{ y4Z &@,_{  
 // Construction vr#+0:|  
 public: T J^u"j-'  
  BOOL bTray; 3<=,1 cU  
  BOOL bRegistered; %+ 7p lM  
  BOOL RegisterHotkey(); d\MLOXnLq;  
  UCHAR cKey; ' K@|3R  
  UCHAR cMask; `.x$7!zLC  
  void DeleteIcon(); ?7:KphFX)  
  void AddIcon(); sb:d>6  
  UINT nCount; :.(;<b<\  
  void SaveBmp(); EcIE~qs  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor dpQG[vXe  
  // Dialog Data )m6M9eC  
  //{{AFX_DATA(CCaptureDlg) V^y^ ;0I}[  
  enum { IDD = IDD_CAPTURE_DIALOG }; -yxOBq  
  CComboBox m_Key; j.a`N2]WE  
  BOOL m_bControl; Qjx?ri//  
  BOOL m_bAlt; }nt* [:%  
  BOOL m_bShift; f~E*Zz`;  
  CString m_Path; O/:UJ( e{  
  CString m_Number; 6s,uXn  
  //}}AFX_DATA T|&[7%F3"  
  // ClassWizard generated virtual function overrides =_j vk.  
  //{{AFX_VIRTUAL(CCaptureDlg) MT(o"ltQ  
 public: xw{-9k-~  
  virtual BOOL PreTranslateMessage(MSG* pMsg); +% /s*EC'w  
 protected: 4'W'}o|{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z\[N!Zt|  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); q'pK,uNW  
  //}}AFX_VIRTUAL [dtbkQt,c  
  // Implementation gTRF^knrY  
 protected: k6`6Mjbc  
  HICON m_hIcon; f%5zBYCgC  
  // Generated message map functions Vcd.mE(t%  
  //{{AFX_MSG(CCaptureDlg) Lb LiB*D#s  
  virtual BOOL OnInitDialog(); }@if6(0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); A+@&"  
  afx_msg void OnPaint();  $R<Me  
  afx_msg HCURSOR OnQueryDragIcon(); 3_JCU05H}  
  virtual void OnCancel(); 0$r^C6}f  
  afx_msg void OnAbout(); t1E[uu,V8  
  afx_msg void OnBrowse(); \OlmF<~  
  afx_msg void OnChange(); G0E121`h  
 //}}AFX_MSG (EPsTox  
 DECLARE_MESSAGE_MAP() "~TA SX_?  
}; 9@Cv5L?p\  
#endif \uss Uv  
+r3IN){jz  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file fnx-s{c?  
#include "stdafx.h" Jk,;JQ  
#include "Capture.h" .`?@%{  
#include "CaptureDlg.h" Vh>Z,()>>@  
#include <windowsx.h> H@]MXP[_  
#pragma comment(lib,"hook.lib") <nEi<iAY>U  
#ifdef _DEBUG ~  T>U  
#define new DEBUG_NEW `6+"Z=:  
#undef THIS_FILE _X?^Cy  
static char THIS_FILE[] = __FILE__; 9@+5LZR  
#endif qZ@s#UiB  
#define IDM_SHELL WM_USER+1 g+X}c/" .  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \W,I?Kx$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); iiK]l   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; dH( ('u[  
class CAboutDlg : public CDialog #Fyuf,hw4  
{ $.]l!cmi%Q  
 public: 6;b~Ht  
  CAboutDlg(); #m={yck *  
  // Dialog Data [$[:"N_  
  //{{AFX_DATA(CAboutDlg) JU&+c6>  
  enum { IDD = IDD_ABOUTBOX }; m.,U:>  
  //}}AFX_DATA 37}D9:#5C  
  // ClassWizard generated virtual function overrides Y3Q9=u*5  
  //{{AFX_VIRTUAL(CAboutDlg) iYC9eEF  
 protected: qx%}knB  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s=CK~+,/  
  //}}AFX_VIRTUAL irjP>3_e  
  // Implementation @IXsy  
 protected: _YRE (YZ/  
  //{{AFX_MSG(CAboutDlg) Ci rZ+o  
  //}}AFX_MSG !>:?rSg*  
  DECLARE_MESSAGE_MAP() G8Du~h!!U  
}; L@fY$Rw  
u{L!n$D7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =FD;~  
{ %j7XEh<'  
 //{{AFX_DATA_INIT(CAboutDlg) D_Bb?o5  
 //}}AFX_DATA_INIT 7%sdtunf`  
} fDSv?crv  
++E3]X|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ge8/``=  
{ m4*@o?Ow  
 CDialog::DoDataExchange(pDX); MHa#?Q9  
 //{{AFX_DATA_MAP(CAboutDlg) 3 h<,  
 //}}AFX_DATA_MAP mx=BD'  
} tor!Dl@Mo  
,cq F3   
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) xMBaVlEN  
 //{{AFX_MSG_MAP(CAboutDlg) sq'Pyz[[  
 // No message handlers +]Y,q w  
 //}}AFX_MSG_MAP V dn&c  
END_MESSAGE_MAP() "!EcbR  
)RcL/n  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) r hfb ftw  
: CDialog(CCaptureDlg::IDD, pParent) $cZUM}@  
{ >]c*'~G&  
 //{{AFX_DATA_INIT(CCaptureDlg) KI+VXH}Y5{  
  m_bControl = FALSE; I"`M@ %  
  m_bAlt = FALSE; AQ ='|%  
  m_bShift = FALSE; dh $bfAb  
  m_Path = _T("c:\\"); O]m+u  
  m_Number = _T("0 picture captured."); nWHa.H#  
  nCount=0; y\x+  
  bRegistered=FALSE; <'g:T(t  
  bTray=FALSE; Q1z;/A$Al  
 //}}AFX_DATA_INIT `[n(" 7,  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 QeK*j/  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9`9R!=NM  
} M8TSt\  
\!ej<T+JR>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) jkvgoxY  
{ !e?.6% %   
 CDialog::DoDataExchange(pDX); ivz{L-  
 //{{AFX_DATA_MAP(CCaptureDlg) OiP!vn}k  
  DDX_Control(pDX, IDC_KEY, m_Key); 42qYg(tZ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 'f?$"U JF  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .AU)*7Gh  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); k|!EDze43?  
  DDX_Text(pDX, IDC_PATH, m_Path); *H|M;G  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9tqF8pb7v  
 //}}AFX_DATA_MAP &sd}ulEg`  
} ?pza G{  
,#kIr  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "T- `$'9  
//{{AFX_MSG_MAP(CCaptureDlg) nxl[d\ap+n  
 ON_WM_SYSCOMMAND() eD#hpl  
 ON_WM_PAINT() .?hP7;hhI  
 ON_WM_QUERYDRAGICON() eET}r 24  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) "%x<ttLl  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *~x/=.}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) /n8B,-Z5s5  
//}}AFX_MSG_MAP ,11H.E Z  
END_MESSAGE_MAP() _:"<[ >9  
W}]%X4<#rN  
BOOL CCaptureDlg::OnInitDialog() q')R4=0 K  
{ .>IhN 5  
 CDialog::OnInitDialog(); +o51x'Ld*  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); yYH0v7vx+  
 ASSERT(IDM_ABOUTBOX < 0xF000); =pC3~-;3  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .uk>QM s1  
 if (pSysMenu != NULL) v7`HQvQEz=  
 { 1{r)L{]  
  CString strAboutMenu; X.e7A/ClEo  
  strAboutMenu.LoadString(IDS_ABOUTBOX); d:U9pC$  
  if (!strAboutMenu.IsEmpty()) c*@E_}C#  
  { 1wP-  
   pSysMenu->AppendMenu(MF_SEPARATOR); <z!CDg4  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _\GC(  
  } fOMW"myQ  
 } 6Avw-}.7>  
 SetIcon(m_hIcon, TRUE); // Set big icon 2j[&=R/.  
 SetIcon(m_hIcon, FALSE); // Set small icon K]9"_UnN  
 m_Key.SetCurSel(0); BFOq8}fX2  
 RegisterHotkey(); u9EgdpD  
 CMenu* pMenu=GetSystemMenu(FALSE); e;[F\ov %  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); s=QAO!aw  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); KSN Pkd6  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [F6U+1n8e  
 return TRUE; // return TRUE unless you set the focus to a control TBT:/Vfun  
} u[ Yk  
WV_.Tiy<  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |YY_^C`"-  
{ &Ob!4+v/GP  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) M!XsJ<jN/  
 { wLOB}ZMT  
  CAboutDlg dlgAbout; ]@Uq=?%  
  dlgAbout.DoModal(); -u8NF_{c  
 } p$3sME$L  
 else z\%Ls   
 { `.Qi?* ^  
  CDialog::OnSysCommand(nID, lParam); L|}lccpI  
 } u2?|Ue@[  
} `I,,C,{C  
n$ou- Q  
void CCaptureDlg::OnPaint() +y3%3EKs1~  
{ ,^. 88<  
 if (IsIconic()) %YC_Se7  
 { 4QIX19{"  
  CPaintDC dc(this); // device context for painting 8Hn|cf0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -K3^BZ HI  
  // Center icon in client rectangle y3o25}"  
  int cxIcon = GetSystemMetrics(SM_CXICON); )j0TeE1R  
  int cyIcon = GetSystemMetrics(SM_CYICON); tE`u(B,  
  CRect rect; `6]%P(#a  
  GetClientRect(&rect); \S! e![L/  
  int x = (rect.Width() - cxIcon + 1) / 2; W1|0Yd ;P  
  int y = (rect.Height() - cyIcon + 1) / 2; ap+JQ@b  
  // Draw the icon zPjHsulK  
  dc.DrawIcon(x, y, m_hIcon); X6@WwM~qz  
 } 75/(??2  
 else %~E ?Z!_W  
 { "q.\>MCv  
  CDialog::OnPaint(); "Pu!dJ5[]  
 } B=^)Ub5'  
} m;GbLncA  
[k;\SXDZo  
HCURSOR CCaptureDlg::OnQueryDragIcon() vPTM  
{ %~2YE  
 return (HCURSOR) m_hIcon; dE4L=sTEsy  
} ~5CBEIF(NS  
:<bB?N(  
void CCaptureDlg::OnCancel() -v]Sr33L  
{ 1Y7Eajt-5  
 if(bTray) iiS-9>]/  
  DeleteIcon(); )quM4=u'  
  CDialog::OnCancel(); (2^gVz=j  
} Y6zbo  
W"}M1o  
void CCaptureDlg::OnAbout() lTV'J?8!-a  
{ ZK@N5/H(  
 CAboutDlg dlg; iV*q2<>  
 dlg.DoModal(); ]pNvxXbeW  
} y}My.c  
D*gFV{ Ws  
void CCaptureDlg::OnBrowse() gT0BkwIV  
{ 4,CXJ2  
 CString str; FtfKe"qw  
 BROWSEINFO bi; X[&Wkr8x '  
 char name[MAX_PATH]; 7!EBH(,z  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ['B?i1 .  
 bi.hwndOwner=GetSafeHwnd(); 7Z\--=;|[:  
 bi.pszDisplayName=name; OZ |IA:,}  
 bi.lpszTitle="Select folder"; hRrn$BdLX  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; +zaA,e?\  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #><.oreXq  
 if(idl==NULL) D(AXk8Vub  
  return; qB0E_y)a  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); tG9BfGF  
 str.ReleaseBuffer(); ]|zp0d=&o  
 m_Path=str; |Lf"6^@yh  
 if(str.GetAt(str.GetLength()-1)!='\\') $c:ynjL|P-  
  m_Path+="\\"; :U3kW8;UMP  
 UpdateData(FALSE); naYrpK,.  
} %_RQx2  
j3{I /m  
void CCaptureDlg::SaveBmp() 6@{(;~r  
{ 1 u| wMO  
 CDC dc; 723bkJw V  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); h]5C|M|  
 CBitmap bm; rV R1wsaL  
 int Width=GetSystemMetrics(SM_CXSCREEN); :Q $K<)[  
 int Height=GetSystemMetrics(SM_CYSCREEN); sk,ox~0R  
 bm.CreateCompatibleBitmap(&dc,Width,Height); u09:Z{tL;@  
 CDC tdc; {mZC$U'  
 tdc.CreateCompatibleDC(&dc); ^;Y|3)vvB  
 CBitmap*pOld=tdc.SelectObject(&bm); r@+ri1c  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); G-xDN59K  
 tdc.SelectObject(pOld); 5NS[dQG5  
 BITMAP btm; juka0/  
 bm.GetBitmap(&btm); w+#C-&z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 1zm ulj%&  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); tiB_a}5IB  
 BITMAPINFOHEADER bih; 5!DBmAB  
 bih.biBitCount=btm.bmBitsPixel; !}v=N";c  
 bih.biClrImportant=0; [S HXJ4P*  
 bih.biClrUsed=0; u37'~&o{U  
 bih.biCompression=0; Kw efs;<E?  
 bih.biHeight=btm.bmHeight; ?s\:hNNY  
 bih.biPlanes=1; 4zev^FR  
 bih.biSize=sizeof(BITMAPINFOHEADER);  "HElB9  
 bih.biSizeImage=size; 5][Ztx  
 bih.biWidth=btm.bmWidth; M)'HCnvs'  
 bih.biXPelsPerMeter=0; !sDh4jQ`  
 bih.biYPelsPerMeter=0; C([phT;  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !MYSfPdS  
 static int filecount=0; +$C 4\$t  
 CString name; b$ve sJ  
 name.Format("pict%04d.bmp",filecount++); <tF9V Jq  
 name=m_Path+name; C${Vg{g7a  
 BITMAPFILEHEADER bfh; WN{ 9  
 bfh.bfReserved1=bfh.bfReserved2=0; ?t/~lv  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @wpN6 /   
 bfh.bfSize=54+size; r=5{o 1"  
 bfh.bfOffBits=54; (]0%}$Fo  
 CFile bf; (qqOjz   
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ A+::O@_s  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =yr0bGy`-  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); T]t+E'sQ  
  bf.WriteHuge(lpData,size); TD1 [  
  bf.Close(); ]ndvt[4L  
  nCount++; ?no fUD.  
 } iYDEI e  
 GlobalFreePtr(lpData); Y ;u<GOe  
 if(nCount==1) b8V~S'6VqO  
  m_Number.Format("%d picture captured.",nCount); Gb8D[1=u=  
 else LQ(yScA@  
  m_Number.Format("%d pictures captured.",nCount); }4Tc  
  UpdateData(FALSE); {;N,t]>8M  
} }Mf!-g  
+W:= e,=  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) fBRo_CU8!  
{ X 9p.gXF  
 if(pMsg -> message == WM_KEYDOWN) J)`-+}7$v  
 { B:gjAb}9T  
  if(pMsg -> wParam == VK_ESCAPE) ?&|5=>u2}$  
   return TRUE; b%<9Sn   
  if(pMsg -> wParam == VK_RETURN) ::ajlRZG  
   return TRUE; :p]'32FA!  
 } rM .|1(u  
 return CDialog::PreTranslateMessage(pMsg); o_@4Sl8  
} _CW(PsfY  
BybW)+~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ] 8Q4BW  
{ iVB86XZ`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6^]!gR#B  
  SaveBmp(); V n*  
  return FALSE; cW i}V  
} pQshUm"_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 99:C"`E{  
 CMenu pop; AWP"b?^G|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); .WPV dwV4U  
 CMenu*pMenu=pop.GetSubMenu(0); ( M7pT  
 pMenu->SetDefaultItem(ID_EXITICON); H *[_cqnv  
 CPoint pt; POvP]G9'"  
 GetCursorPos(&pt); Z&|Kki*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); R{ a"Y$  
 if(id==ID_EXITICON) vg3=8>#  
  DeleteIcon(); U<CTubF  
 else if(id==ID_EXIT) `glBV`?^  
  OnCancel(); QA<Jr5Ys  
 return FALSE;  .Nw=[  
} f>W -  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?,& tNP{jq  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $lLz 3YS  
 AddIcon(); nq6@6GRG  
 return res; R $&o*K`?  
} )xbHCoU,  
WN01h=1J_  
void CCaptureDlg::AddIcon() $Hj.{;eC/k  
{ w,h`s.AN  
 NOTIFYICONDATA data; BsEF'h'Owh  
 data.cbSize=sizeof(NOTIFYICONDATA); rd9e \%A  
 CString tip; jg.QRny^  
 tip.LoadString(IDS_ICONTIP); f ` R/ i  
 data.hIcon=GetIcon(0); ch0{+g&  
 data.hWnd=GetSafeHwnd(); qNYN-f~@,  
 strcpy(data.szTip,tip); [/Rf\T(,jn  
 data.uCallbackMessage=IDM_SHELL; 5*1D$mxD"  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; B)qWtMZx  
 data.uID=98; s;3={e.  
 Shell_NotifyIcon(NIM_ADD,&data); 8=gjY\Dp  
 ShowWindow(SW_HIDE); a>GyO&+Dkg  
 bTray=TRUE; /(iFcMT  
} &ge "x{,?  
xO&eRy?%  
void CCaptureDlg::DeleteIcon() i(>4wK!!  
{ /7}It$|nhy  
 NOTIFYICONDATA data; eD*A )  
 data.cbSize=sizeof(NOTIFYICONDATA); P@9t;dZN  
 data.hWnd=GetSafeHwnd(); ;xzUE`uUfJ  
 data.uID=98; T[j#M+p  
 Shell_NotifyIcon(NIM_DELETE,&data); @JyK|.b#0  
 ShowWindow(SW_SHOW); b/C`J p  
 SetForegroundWindow(); X22[tqg;&  
 ShowWindow(SW_SHOWNORMAL); YgUvOyaQXf  
 bTray=FALSE; R,pX:H&#+  
} 4:r!|PJn{G  
~ xft  
void CCaptureDlg::OnChange() qI~xlW  
{ A^)?Wt%*  
 RegisterHotkey(); i 7x7xtq  
} qzf!l"bT  
MLRK74D  
BOOL CCaptureDlg::RegisterHotkey()  (Q.waI  
{ E0MGRI"me  
 UpdateData(); M#As0~y  
 UCHAR mask=0; bO'Sgc[]  
 UCHAR key=0; Q\ U:~g3  
 if(m_bControl) ~TS y<t~%-  
  mask|=4; :=wT vz  
 if(m_bAlt) 7z!tKs"TMT  
  mask|=2; qoj$]   
 if(m_bShift)  B[Zjfc  
  mask|=1; 1n:8s'\  
  key=Key_Table[m_Key.GetCurSel()]; E#u l IgD  
 if(bRegistered){ e S<lwA_  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); gG-BVl"59  
  bRegistered=FALSE; 9Hc$G{[a  
 } dt`{!lts'  
 cMask=mask; =gJb^ Gx(w  
 cKey=key; V- Cv,8   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pO ml8SQf  
 return bRegistered; DjN|Wr)*  
} v(EEG/~  
5ZMR,SZhC  
  四、小结 :yeq(o K,  
$+>M{fg?  
  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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