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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: .NKN2  
  Y3[@(  
  一、实现方法 &~i1 @\]  
$Ix^Rm9c  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: Yr+&|;DB  
"jSn`  
#pragma data_seg("shareddata") MYjCxy-;A  
HHOOK hHook =NULL; //钩子句柄 (~jOtUyT  
UINT nHookCount =0; //挂接的程序数目 jzQgD ed ]  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 L,i-T:Z~=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 `6zoZM7?Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey [K5afnq`  
static int KeyCount =0; q45n.A6a  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ;/v^@  
#pragma data_seg() Px<;-H`  
VD4(  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 fA8 ,wy|>  
FX{Sb"  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 'G&w[8mqY  
%EuSP0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =#W6+=YN8  
cKey,UCHAR cMask) E:2Or~  
{ 2n\EZ  
 BOOL bAdded=FALSE; 2'D2>^os  
 for(int index=0;index<MAX_KEY;index++){ +p2)uXqW  
  if(hCallWnd[index]==0){ >1YJETysO  
   hCallWnd[index]=hWnd; zQ6otDZx  
   HotKey[index]=cKey; (UCWSA7oc  
   HotKeyMask[index]=cMask; (uSfr]89'  
   bAdded=TRUE; 1'ZBtX~A  
   KeyCount++; xu3qX"  
   break; Hg]r5Fe/c  
  } 8{AzB8xp  
 } a$ Z06j  
 return bAdded; L~\Ir  
} '2eggX%  
//删除热键 E;yP.<PW  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,a}+Jj{  
{ >y5~:L  
 BOOL bRemoved=FALSE; Up~#]X  
 for(int index=0;index<MAX_KEY;index++){ .RdnJ&K*  
  if(hCallWnd[index]==hWnd){ %k9GoX_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {<V{0 s%  
    hCallWnd[index]=NULL; n;[d{bU  
    HotKey[index]=0; XOU 9r(  
    HotKeyMask[index]=0; lwSA!W  
    bRemoved=TRUE; 8RB\P:6h  
    KeyCount--; 3qP! (*  
    break; zpJQ7hym  
   } />H9T[3=  
  } G#UO>i0jy  
 } 'bTtdFvJ  
 return bRemoved; o^mW`g8[  
} @u?m4v{  
`$05+UU  
T< D&%)  
  DLL中的钩子函数如下: nwf(`=TC  
F8nR.|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) v#TU7v?~  
{ S3$&}I <  
 BOOL bProcessed=FALSE; C h>r.OfP  
 if(HC_ACTION==nCode) `@RTfBB g  
 { UZz/v#y~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 iU+O(vi  
   switch(wParam) )1N~-VuT  
   {  ) vn {?Ulj  
    case VK_MENU: h:xvnyaI  
     MaskBits&=~ALTBIT; 3VaL%+T$,  
     break; :pq+SifP  
    case VK_CONTROL: p C^d-Ii  
     MaskBits&=~CTRLBIT; Zcjh  
     break; s+DOr$\  
    case VK_SHIFT: u^, eHO  
     MaskBits&=~SHIFTBIT; ~wvu7  
     break; ^VOFkUp)  
    default: //judge the key and send message {u~JR(C:  
     break; 6Z.Fyte  
   } >P@g].Q-  
   for(int index=0;index<MAX_KEY;index++){ E6XDn`:  
    if(hCallWnd[index]==NULL) |h%=a8  
     continue; f\xmv|8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DaP,3>M  
    { cDS \=Bf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w{mw?0  
     bProcessed=TRUE; $O3.ex V  
    } "zj[v1K9-A  
   } HA$X g j  
  } 5\V""fH  
  else if((lParam&0xc000ffff)==1){ //有键按下 ncrg`<'/,  
   switch(wParam) "%lIB{  
   { L>LIN 1A  
    case VK_MENU: -^+fZBU;  
     MaskBits|=ALTBIT; hi`[  
     break; L I*=T   
    case VK_CONTROL: __!LTpp  
     MaskBits|=CTRLBIT; Me79:+d  
     break; ZLP/&`>8  
    case VK_SHIFT: PriLV4?  
     MaskBits|=SHIFTBIT; bmu]zJ  
     break; j"K^zh  
    default: //judge the key and send message 7r&lW<:>  
     break; ,~q:rh+  
   } q #mBNe62p  
   for(int index=0;index<MAX_KEY;index++){ kDol1v`  
    if(hCallWnd[index]==NULL) _3(rwD  
     continue; 63'm @oZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k@ <dru  
    { ? X6M8`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w? >f:2(=[  
     bProcessed=TRUE; l`.z^+!8@  
    } !( >U3N  
   } ;plBo%EBV  
  } "4\k1H"_  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 {CV+1kz  
   for(int index=0;index<MAX_KEY;index++){ /{f"0]-RA  
    if(hCallWnd[index]==NULL) P0yDL:X[  
     continue; 3CgID6[Sy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +j{(NwsX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "MU-&**  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 f`:GjA,J$  
   } h;,1BpbM  
  } C7ug\_,s  
 } H1f='k]SZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); o3V\   
} gUNhN1=  
LD ]-IX&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: ?h6|N%U'  
}[Z'Sg]s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j*@@H6G  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s]% C z\  
TKM^  
  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: o!:Z?.!  
 Z/%FQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /i3 JP}  
{ D#UuIZ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) T[ZmD{6l  
 { @oE 5JM  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 yI 2UmhA  
  SaveBmp(); o>_})WM1[  
  return FALSE; Vf;&z$D{r  
 } [a04( 2g  
 …… //其它处理及默认处理 U xBd14-R_  
} /kY9z~l  
HD^#"  
S s+F  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 =}0Uw4ub(u  
'|DW#l\n  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Yy88 5  
sqrLys_S  
  二、编程步骤 (da`aRVDp  
l)9IgJ|<b  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; . :Skc  
cc|W1,q  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; HEBeJ2w  
>G:Q/3jh  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; {1)A"lQu  
U?#wWbE1  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Q,[G?vbj  
moM? aYm  
  5、 添加代码,编译运行程序。 kJJT`Ba&/  
5p (zhfuG  
三、程序代码 =#2c r:1  
.\ ;'>qy  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL cD0rU8x  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) (-gomn  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ob\-OMNs@  
#if _MSC_VER > 1000 {V6&((E8  
#pragma once hZx&j{  
#endif // _MSC_VER > 1000 S@/{34,  
#ifndef __AFXWIN_H__ wXKtQ#o}  
#error include 'stdafx.h' before including this file for PCH jVQy{8{G  
#endif X:oOp=y]|  
#include "resource.h" // main symbols r[S(VPo[()  
class CHookApp : public CWinApp L[x`i'0B  
{ w"v!+~/9  
 public: qYC&0`:H  
  CHookApp(); N1$u@P{  
  // Overrides g'7E6n"!,  
  // ClassWizard generated virtual function overrides % T({;/  
  //{{AFX_VIRTUAL(CHookApp)  T Rv  
 public: :C:6bDQ  
  virtual BOOL InitInstance(); G?s9c0f  
  virtual int ExitInstance(); ubwM*P  
  //}}AFX_VIRTUAL lU{)%4e`  
  //{{AFX_MSG(CHookApp) 50cVS)hG6d  
  // NOTE - the ClassWizard will add and remove member functions here. {7o3wxsS  
  // DO NOT EDIT what you see in these blocks of generated code ! [Fl_R[o  
  //}}AFX_MSG O] @E8<?^  
  DECLARE_MESSAGE_MAP() Y4rxnXGw  
}; \ %Mcvb.?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); \O5L#dc#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {<42PJtPY  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |Xt.[1  
BOOL InitHotkey(); x3q^}sj%  
BOOL UnInit(); "w:h  
#endif ?()*"+N(ck  
dKzG,/1W[m  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. $ VT)  
#include "stdafx.h" M+ +Dk7B  
#include "hook.h" J :O!4gI  
#include <windowsx.h> $94lF~  
#ifdef _DEBUG S2$66xr#  
#define new DEBUG_NEW riIubX#  
#undef THIS_FILE i!a!qE.1  
static char THIS_FILE[] = __FILE__; if*V-$[I  
#endif o%_-u +  
#define MAX_KEY 100 cXq9k!I%  
#define CTRLBIT 0x04 9^a|yyzL  
#define ALTBIT 0x02 4|?(LHBD)  
#define SHIFTBIT 0x01 //&3{B  
#pragma data_seg("shareddata") k4'] q  
HHOOK hHook =NULL; %3`*)cp@  
UINT nHookCount =0; Y/sav;  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey jj{:=l ZB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT nt2b}u>*  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SoziFI  
static int KeyCount =0; HxO+JI`'3  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Q`k;E}x_-  
#pragma data_seg() 9K$ x2U  
HINSTANCE hins; 5iw\F!op:  
void VerifyWindow(); TCp9C1Q4  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) .q 2r!B  
//{{AFX_MSG_MAP(CHookApp) F@<cp ?dR  
// NOTE - the ClassWizard will add and remove mapping macros here. HM% +Y47a  
// DO NOT EDIT what you see in these blocks of generated code! WO>,=^zPJ  
//}}AFX_MSG_MAP ?8O5%IrJ  
END_MESSAGE_MAP() 5Ew( 0K[  
z};|.N}  
CHookApp::CHookApp() )7.)fY$  
{ lat5n&RP Y  
 // TODO: add construction code here, [[[C`H@  
 // Place all significant initialization in InitInstance Qb {[xmc  
} KH2]:&6:Q  
iQO4IT   
CHookApp theApp; yy5|8L  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) t^&hG7L_m,  
{ B 2NIV7  
 BOOL bProcessed=FALSE; &J/EBmY[  
 if(HC_ACTION==nCode) Ry +?#P+  
 { NnAIL;WS  
  if((lParam&0xc0000000)==0xc0000000){// Key up #H6YI3 `G  
   switch(wParam) ! >F70  
   { ~C{:G;Iy0  
    case VK_MENU: E{)X ;kN=  
     MaskBits&=~ALTBIT; mX>N1zAz  
     break; ,x\qYz+7|  
    case VK_CONTROL: (&.T  
     MaskBits&=~CTRLBIT; m ^FKE:  
     break; * K$ U[$s  
    case VK_SHIFT: \dQc!)&C9  
     MaskBits&=~SHIFTBIT; >,Y+ 1  
     break; GJWGT`"  
    default: //judge the key and send message `Ij EwKra  
     break; zsuqRM "  
   } qUfoEpW2=6  
   for(int index=0;index<MAX_KEY;index++){ G+fo'ThG  
    if(hCallWnd[index]==NULL) Z'A 3\f   
     continue; ^zTe9:hz/\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bj`GGxzOb  
    { v2tVq_\AMx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Zb_A(mnzh  
     bProcessed=TRUE; |*48J1:1y  
    } }bRn&)e  
   } >-V632(/{o  
  } "'t f]s  
  else if((lParam&0xc000ffff)==1){ //Key down HT/!+#W .  
   switch(wParam) tQG'f*4  
   { bLS10^g5  
    case VK_MENU: --diG$x.  
     MaskBits|=ALTBIT; onmpMU7w  
     break; 7:g_:}m  
    case VK_CONTROL: Y'000#+  
     MaskBits|=CTRLBIT; l1kHFeq  
     break; '+Jy//5?  
    case VK_SHIFT: |11vm#  
     MaskBits|=SHIFTBIT; 8+Tv@  
     break; !\|  
    default: //judge the key and send message ^O<v'\!z-  
     break; ;ZuHv {=  
   } 'DXT7|Df  
   for(int index=0;index<MAX_KEY;index++) 3f$n8>mq  
   { 1.u^shc&|  
    if(hCallWnd[index]==NULL) M]X!D7  
     continue; P0; y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :LB*l5\  
    { CT_tJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /JRZ?/<1  
     bProcessed=TRUE; vCej( ))  
    } DZmVm['l  
   } G11KAq(  
  } gFuK/]gzI  
  if(!bProcessed){ #5h_{q4l  
   for(int index=0;index<MAX_KEY;index++){ Kg~D~ +j  
    if(hCallWnd[index]==NULL) ez9F!1  
     continue; ;F- mt(Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) prt(xr4@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @f"[*7Q`/  
   } t$,G%micj  
  } \: F$7 *Ne  
 } pRh9+1EM;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4$, W\d  
} D^>d<LX  
M  hW9^?  
BOOL InitHotkey() 1!V[fPJ  
{ HCrQ+r{g  
 if(hHook!=NULL){ '\d ldg#P  
  nHookCount++; Lp"OXJ*es  
  return TRUE; d 4tL  
 } D=vw0Q_3Y3  
 else )uAY_()/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); sZ&6g<8#y  
  if(hHook!=NULL) AH/^v;-  
   nHookCount++; d3\?:}o,  
  return (hHook!=NULL); ,]yS BAO  
} "9^b1UH<  
BOOL UnInit() <z%**gP~G  
{ NAtDt=  
 if(nHookCount>1){ {hOS0).(w7  
  nHookCount--; 6ERMn"[_w  
  return TRUE; 9[X'9* ,  
 } NwOV2E6@OW  
 BOOL unhooked = UnhookWindowsHookEx(hHook); i"n_oO  
 if(unhooked==TRUE){ Hmm0H6&u  
  nHookCount=0; VI9rezZ*  
  hHook=NULL; H-&27?s^  
 } !^y;|9?O  
 return unhooked; 4Zu1G#(zP  
} Q5dqn"?  
3O4lG e#u  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wmVb0~[  
{ 2G-"HOG  
 BOOL bAdded=FALSE;  h#}w18l  
 for(int index=0;index<MAX_KEY;index++){ ct|0zl~  
  if(hCallWnd[index]==0){ XP!m]\E&I  
   hCallWnd[index]=hWnd; <Qv/# k  
   HotKey[index]=cKey; i)(G0/:  
   HotKeyMask[index]=cMask; XNx$^I=  
   bAdded=TRUE; 3^&`E} r  
   KeyCount++; ;CS[Ja>e  
   break; Q_fgpjEh/t  
  } S-\wX.`R1  
 } 6~ y'  
 return bAdded; aj|PyX3P:  
} F-o?tU  
@}R y7H0O  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) />I5,D'h  
{ VFF5 Tp  
 BOOL bRemoved=FALSE; >Ho=L)u  
 for(int index=0;index<MAX_KEY;index++){ i Pr(X  
  if(hCallWnd[index]==hWnd){ uSI@Cjp  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ oI`Mn3N  
    hCallWnd[index]=NULL; 44~ReN}`  
    HotKey[index]=0; XW8@c2jN\7  
    HotKeyMask[index]=0; IFr"IOr'l  
    bRemoved=TRUE; (ot56`,k  
    KeyCount--; }m?Ut|  
    break; ;c]O*\/  
   } kk<%VKC  
  } t1 9f%d  
 } saZK+kD4I  
 return bRemoved; _8K8Ai-~.>  
} 7;'UC','  
!<j4*av:G  
void VerifyWindow() '>1M~B  
{ %nq<nfDT  
 for(int i=0;i<MAX_KEY;i++){ 8/)q$zs  
  if(hCallWnd!=NULL){ paN=I=:*M  
   if(!IsWindow(hCallWnd)){ B[YyA  
    hCallWnd=NULL; "38<14V  
    HotKey=0; $4ZV(j]  
    HotKeyMask=0; S=V  
    KeyCount--; a9^})By&  
   } v+sF0 j\P  
  } -*w2<DCn  
 } ZW"f*vwQo  
} O\;Lb[`lb  
j?$B@Zk  
BOOL CHookApp::InitInstance() jZidT9[g  
{ <=%[.. (S  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ph(LsPT-  
 hins=AfxGetInstanceHandle(); bL0]Yuh  
 InitHotkey(); e'G3\h}#  
 return CWinApp::InitInstance(); ]x8Y]wAU&{  
} W2$rC5|  
ZT/f  
int CHookApp::ExitInstance() r/NaoIrJV  
{ x2I|iA=  
 VerifyWindow(); B$JPE7h@[P  
 UnInit(); 6-?/kY6  
 return CWinApp::ExitInstance(); q2*)e/}H  
} mGP%"R2X  
VY~*QF~P  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file (?XIhpd  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) U$a)lcJd  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Fv/{)H<:y  
#if _MSC_VER > 1000  r?0w5I  
#pragma once t,XbF  
#endif // _MSC_VER > 1000 x?0(K=h,  
9,Dw;|A]  
class CCaptureDlg : public CDialog T=V{3v@zs  
{ ;VCFDE{K=  
 // Construction h;} fdk  
 public: 60>g{1]  
  BOOL bTray; ' t(#HBU  
  BOOL bRegistered; C$ at9=(E6  
  BOOL RegisterHotkey(); SU7,uxF  
  UCHAR cKey; Avljrds+7  
  UCHAR cMask; r_'];  
  void DeleteIcon(); \Z%_dT}  
  void AddIcon(); Ug gg!zA  
  UINT nCount; 1#>uqUxah  
  void SaveBmp(); PDgZb  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7I(QTc)*  
  // Dialog Data ZS_  z  
  //{{AFX_DATA(CCaptureDlg) | z}VP-L  
  enum { IDD = IDD_CAPTURE_DIALOG }; t?weD{O  
  CComboBox m_Key; yg|yoL'g  
  BOOL m_bControl; UAI'tRY N_  
  BOOL m_bAlt; <Fl.W}?Q}  
  BOOL m_bShift; ~^ '+ .  
  CString m_Path; a)+*Gf7?  
  CString m_Number; vf?m6CMU !  
  //}}AFX_DATA !14v Ovj4{  
  // ClassWizard generated virtual function overrides vHPsHy7y  
  //{{AFX_VIRTUAL(CCaptureDlg) m5?t<H~  
 public: OCqknA  
  virtual BOOL PreTranslateMessage(MSG* pMsg); G-o6~"J\  
 protected: -"N vu  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $9Xn.,W  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); E%Ysyk  
  //}}AFX_VIRTUAL yWH!v]S  
  // Implementation V3 ~&R:Z9e  
 protected: ?FZ) LZM  
  HICON m_hIcon; d.U"lP/)D  
  // Generated message map functions Q?Xqf7y  
  //{{AFX_MSG(CCaptureDlg) %wJ>V-\e  
  virtual BOOL OnInitDialog(); j3 @Q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); sk t9mU  
  afx_msg void OnPaint(); =}+xD|T  
  afx_msg HCURSOR OnQueryDragIcon(); K1- 3!G  
  virtual void OnCancel(); IJZx$8&A  
  afx_msg void OnAbout(); W>u$x=<T  
  afx_msg void OnBrowse(); fzjtaH?  
  afx_msg void OnChange(); CSFE[F63  
 //}}AFX_MSG ZzT"u1,&  
 DECLARE_MESSAGE_MAP() 9.Sv"=5gz  
}; +5Y;JL<%/  
#endif catJC3  
S)^eHuXPI  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file }%,LV]rGEZ  
#include "stdafx.h" #\LYo{op/.  
#include "Capture.h" 3HndE~_C&  
#include "CaptureDlg.h" <+<,$jGC-  
#include <windowsx.h> !3*%-8bp  
#pragma comment(lib,"hook.lib") v@:m8Y(t  
#ifdef _DEBUG .7Itbp6=R  
#define new DEBUG_NEW 5%fR9?)  
#undef THIS_FILE ~ #P` 7G  
static char THIS_FILE[] = __FILE__; xZMAX}8v  
#endif h7}P5z0F  
#define IDM_SHELL WM_USER+1 C^ ~[b o  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S <++eu  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jXyK[q&O&  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *nY$YwHB  
class CAboutDlg : public CDialog ","to  
{ iB{l:  
 public: MBFn s/  
  CAboutDlg(); Ehtb`Ms  
  // Dialog Data tj" EUqKQ  
  //{{AFX_DATA(CAboutDlg) p xQh;w  
  enum { IDD = IDD_ABOUTBOX }; -$f$z(h  
  //}}AFX_DATA h]^= y.Q  
  // ClassWizard generated virtual function overrides w `>g^_xsg  
  //{{AFX_VIRTUAL(CAboutDlg) $4>x4*  
 protected: 9P-I)ZqL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F#l!LER^1g  
  //}}AFX_VIRTUAL R lmeZy4.  
  // Implementation ^cI RP  
 protected: l]geQl:7`r  
  //{{AFX_MSG(CAboutDlg) lUM-~  
  //}}AFX_MSG +2^Mz&I@b  
  DECLARE_MESSAGE_MAP() @?[}\9dW  
}; y6Ea_v  
Y ^}c+)t  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) l|  QQ  
{ 'X1/tB8*  
 //{{AFX_DATA_INIT(CAboutDlg) S>EO6z#   
 //}}AFX_DATA_INIT `g,i `<  
} :stA]JB# w  
G/_9!lE  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XbW 1`PH  
{ xayd_RB9  
 CDialog::DoDataExchange(pDX); )gKX +'  
 //{{AFX_DATA_MAP(CAboutDlg) b:6e2|xf?  
 //}}AFX_DATA_MAP E>x,$w<?  
} 690;\O '  
(p}N cn.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |F52)<\  
 //{{AFX_MSG_MAP(CAboutDlg) 9{n?Jy  
 // No message handlers r>7Dg~)V  
 //}}AFX_MSG_MAP JCZ5q9b  
END_MESSAGE_MAP() C_V5.6T!  
iea7*]vW  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }Uunlz<  
: CDialog(CCaptureDlg::IDD, pParent) ZD`0(CkXb  
{ sGFC?1r?\  
 //{{AFX_DATA_INIT(CCaptureDlg) j<_)Y(x>  
  m_bControl = FALSE; "|K D$CY  
  m_bAlt = FALSE; 5s=L5]]r_j  
  m_bShift = FALSE; R\n*O@E v3  
  m_Path = _T("c:\\"); u75(\<{  
  m_Number = _T("0 picture captured."); 5SwQ9#  
  nCount=0; ]sV) '-  
  bRegistered=FALSE; JAP4Vwj%j  
  bTray=FALSE; 6Bn%7ZBv  
 //}}AFX_DATA_INIT Ox}a\B8  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 jL9to6 Hmr  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); #H/suQZN"g  
} C(lGW,!  
s N|7   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Xmaj7*f>p  
{ n~G-X  
 CDialog::DoDataExchange(pDX); " )/febBS  
 //{{AFX_DATA_MAP(CCaptureDlg) ]R8JBnA  
  DDX_Control(pDX, IDC_KEY, m_Key); bf-V Q7  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Q[.HoqWK  
  DDX_Check(pDX, IDC_ALT, m_bAlt); EZg$mp1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1JSKK.LuJV  
  DDX_Text(pDX, IDC_PATH, m_Path); ; `-@L  
  DDX_Text(pDX, IDC_NUMBER, m_Number); O2C&XeB:4  
 //}}AFX_DATA_MAP AWn$od`#s  
} dSw%Qv*y  
 ~xV|<;  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `%A>{A"  
//{{AFX_MSG_MAP(CCaptureDlg) rk .tLk  
 ON_WM_SYSCOMMAND() "qvJ-Y  
 ON_WM_PAINT() S 0L"5B@  
 ON_WM_QUERYDRAGICON() kMY1Xb  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ^Y- S"Ks  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ju{\7X5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) e!JC5Al7  
//}}AFX_MSG_MAP ;Vh5nO  
END_MESSAGE_MAP() >pq= .)X}  
%+e% RZ3  
BOOL CCaptureDlg::OnInitDialog() No G`J$D  
{ -P7JaH/Q  
 CDialog::OnInitDialog(); hj|P*yKV  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Xj("  
 ASSERT(IDM_ABOUTBOX < 0xF000); pXv@ QD#!  
 CMenu* pSysMenu = GetSystemMenu(FALSE); WyD L ah^/  
 if (pSysMenu != NULL) !<I3^q  
 { nFY6K%[  
  CString strAboutMenu; wEJ) h1=)^  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ! Al?B9KJ  
  if (!strAboutMenu.IsEmpty()) I!OV+utF  
  { [$[1|r *Q  
   pSysMenu->AppendMenu(MF_SEPARATOR); xU_Dg56z'&  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 3iC$ "9!p  
  } $X%'je  
 } &m J +#vT  
 SetIcon(m_hIcon, TRUE); // Set big icon h8me.=S&  
 SetIcon(m_hIcon, FALSE); // Set small icon WC<K(PP  
 m_Key.SetCurSel(0); j9G1  _  
 RegisterHotkey(); a2tRmil  
 CMenu* pMenu=GetSystemMenu(FALSE); :`w'}h7m  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); lyYi2& %  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); C/L+gU&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7xr@$-U  
 return TRUE; // return TRUE unless you set the focus to a control w;Jby  
} q" aUA_}\  
sq~9 l|F  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]~H\X":[>  
{ /degBL+  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {j{H@rHuy  
 { 5o&noRIIr  
  CAboutDlg dlgAbout; &>]c"?C*  
  dlgAbout.DoModal(); ;5(ptXX1W  
 } 6*]g~)7`Q~  
 else q;<=MO/  
 { ,-GkP>8f(  
  CDialog::OnSysCommand(nID, lParam); Ja@zeD)f"  
 } wQV[ZfU^h  
} CMI V"-  
Sb;=YW 1<  
void CCaptureDlg::OnPaint() 8r46Wr7Q  
{ |)pRkn8x  
 if (IsIconic()) #-*#? -  
 { 0~:Eo89  
  CPaintDC dc(this); // device context for painting Z:2a_A tm  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); HpX ;:/I  
  // Center icon in client rectangle ;I^+u0ga  
  int cxIcon = GetSystemMetrics(SM_CXICON); Gec?  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2sryhS'(H  
  CRect rect; iE;D_m.>`O  
  GetClientRect(&rect); !8 V  
  int x = (rect.Width() - cxIcon + 1) / 2; yK3b^  
  int y = (rect.Height() - cyIcon + 1) / 2; L~u@n24  
  // Draw the icon L~PBD?l  
  dc.DrawIcon(x, y, m_hIcon); j~Cch%%G  
 } X?8EPCk  
 else qij<XNZU"&  
 { I \DH  
  CDialog::OnPaint(); XFiP8aX<  
 } c6@7>PM  
} %gb4(~E+N  
1K`7  
HCURSOR CCaptureDlg::OnQueryDragIcon() f=L&>X  
{ Q*J8`J:#^R  
 return (HCURSOR) m_hIcon; ~5Cid)Q}@o  
} K_" denzT+  
TOe=6 Z5h  
void CCaptureDlg::OnCancel() /#C}1emK  
{ sBLf(Q,  
 if(bTray) Mt93YD-2+  
  DeleteIcon(); :~Z -K\  
  CDialog::OnCancel(); <V~B8C!)  
} oY K(=j  
~Gz b^  
void CCaptureDlg::OnAbout() 8NJxtT~0c~  
{ oN\IQ7oI  
 CAboutDlg dlg; BsJ d*-:X  
 dlg.DoModal(); A./ VO  
} 'kC,pN{->  
N-9Vx#i  
void CCaptureDlg::OnBrowse() Sl!#!FGI  
{ /YLHg5n8+  
 CString str; {%"n[DLps  
 BROWSEINFO bi; $q iY)RE  
 char name[MAX_PATH]; pr) `7VuKp  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ]"2;x  
 bi.hwndOwner=GetSafeHwnd(); C2[* $ 1U  
 bi.pszDisplayName=name; .EF(<JC?  
 bi.lpszTitle="Select folder"; [@&0@/s*t'  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; K|{IX^3)V  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ? +q(,P@*  
 if(idl==NULL) 6` 8H k;  
  return; bl8EzO  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); FkH HTO  
 str.ReleaseBuffer(); `Pcbc\"*y  
 m_Path=str; 6VsgZ"Il  
 if(str.GetAt(str.GetLength()-1)!='\\') OABMIgX  
  m_Path+="\\"; ?DwI>< W  
 UpdateData(FALSE); DT Cwf  
} \{8?HjJEM  
]+ KN9  
void CCaptureDlg::SaveBmp() >STAPrBp+  
{ zarxv| }$  
 CDC dc; BWWO=N  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); P5K=S.g  
 CBitmap bm; +}.~"  
 int Width=GetSystemMetrics(SM_CXSCREEN); L/Ytkag  
 int Height=GetSystemMetrics(SM_CYSCREEN); WCdl 25L#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); o _G,Ph!7  
 CDC tdc; aWCZ1F  
 tdc.CreateCompatibleDC(&dc); !<8-juY  
 CBitmap*pOld=tdc.SelectObject(&bm); T@4R|P&{)  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _&wrA3@/L  
 tdc.SelectObject(pOld); VK]cZ%)  
 BITMAP btm; 5{"v/nXV  
 bm.GetBitmap(&btm); XY h)59oM%  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; x* 9 Xu"?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); e2><Y<  
 BITMAPINFOHEADER bih; GGQ%/i]:  
 bih.biBitCount=btm.bmBitsPixel; %6%~`((4  
 bih.biClrImportant=0; ' a>YcOw  
 bih.biClrUsed=0; )-s9CWJv  
 bih.biCompression=0; 'xP&u<(F  
 bih.biHeight=btm.bmHeight; w wuM!Z+  
 bih.biPlanes=1; k Xg&}n7  
 bih.biSize=sizeof(BITMAPINFOHEADER); Lhz*o6)  
 bih.biSizeImage=size; sc0.!6^'V  
 bih.biWidth=btm.bmWidth; @fc-[pv  
 bih.biXPelsPerMeter=0; \}n\cUy-  
 bih.biYPelsPerMeter=0; g!\H^d4  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @BmI1  
 static int filecount=0; !S3^{l-  
 CString name; F<+!28&h  
 name.Format("pict%04d.bmp",filecount++); [X%Wg:K  
 name=m_Path+name; Z^[ ]s1iP}  
 BITMAPFILEHEADER bfh; Im g$D*BM  
 bfh.bfReserved1=bfh.bfReserved2=0;  Nt w?~%  
 bfh.bfType=((WORD)('M'<< 8)|'B'); D^Gs_z$['  
 bfh.bfSize=54+size; F%tV^$%  
 bfh.bfOffBits=54; )yt_i'D}  
 CFile bf; (Qcd !!   
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ # E{2 !Z  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =`KA@~XH4  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ;xl0J*r  
  bf.WriteHuge(lpData,size); chE}TK  
  bf.Close(); VrIR!9%:  
  nCount++; r6Qsh CA"  
 } Ht"?ajW{  
 GlobalFreePtr(lpData); \:m1{+l  
 if(nCount==1) KPrH1 [VU  
  m_Number.Format("%d picture captured.",nCount); _qO'(DKylC  
 else Tpd|+60g  
  m_Number.Format("%d pictures captured.",nCount); Xmm) z  
  UpdateData(FALSE); bk=ee7E7>  
} >\o._?xSA  
Ab In\,x  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) YW2h#PV6_  
{ FPE%h =sw  
 if(pMsg -> message == WM_KEYDOWN) "}x%5/(  
 { &~a S24c  
  if(pMsg -> wParam == VK_ESCAPE) kRb  %:*  
   return TRUE; @g5qcjD'[  
  if(pMsg -> wParam == VK_RETURN) 4Jf9N'  
   return TRUE; /U 3Uuk:  
 } KK}ox%j  
 return CDialog::PreTranslateMessage(pMsg); eev-";c  
} B2,c_[UZ.  
q|g>;_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8CUlE-R5  
{ 6E-AfY'<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ R uGG3"|  
  SaveBmp(); fgoLN\  
  return FALSE; ictV7)  
} `k6ZAOQtX  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .Im=-#EN  
 CMenu pop; ]5r@`%9  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !T#EkMM  
 CMenu*pMenu=pop.GetSubMenu(0); 1{A K=H')  
 pMenu->SetDefaultItem(ID_EXITICON); jx{wOb~oO)  
 CPoint pt; z*UgRLKZD  
 GetCursorPos(&pt); )*XD"-9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); v&qL r+_7  
 if(id==ID_EXITICON) 2e9.U/9  
  DeleteIcon(); ifcp!l+8  
 else if(id==ID_EXIT) >r3SF3XMq  
  OnCancel();  b]gVZ-  
 return FALSE; RcC5_@W  
} \^1S:z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ox*>HkV  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ALQ-aXJ  
 AddIcon(); z d6F}2*6  
 return res; E)`:sSd9  
} }P'c8$  
v!W{j&N  
void CCaptureDlg::AddIcon() PX*}.L *x  
{ 1\a.o[g3e  
 NOTIFYICONDATA data; W\2 ']7}e  
 data.cbSize=sizeof(NOTIFYICONDATA); 7$*X   
 CString tip; TwsI8X  
 tip.LoadString(IDS_ICONTIP); y_' 6bpb  
 data.hIcon=GetIcon(0); j5wfqi  
 data.hWnd=GetSafeHwnd(); b Rc,Y<  
 strcpy(data.szTip,tip); n?778Wo}  
 data.uCallbackMessage=IDM_SHELL; _G&gF .|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; jU-aa+  
 data.uID=98; M1icj~Jr  
 Shell_NotifyIcon(NIM_ADD,&data); !zfKj0^  
 ShowWindow(SW_HIDE); /i~x.i3  
 bTray=TRUE; zI0d  
} S Rk%BJ? ~  
Ci4; e  
void CCaptureDlg::DeleteIcon() ,{;*b v  
{ guG&3{&\s  
 NOTIFYICONDATA data; TuEM  
 data.cbSize=sizeof(NOTIFYICONDATA); WvZt~x&2  
 data.hWnd=GetSafeHwnd(); Z9.0#Jnu  
 data.uID=98; :(\JY?+w   
 Shell_NotifyIcon(NIM_DELETE,&data); ?N(<w?Gat  
 ShowWindow(SW_SHOW); ^ L]e]<h(  
 SetForegroundWindow(); /J(vqYK"  
 ShowWindow(SW_SHOWNORMAL); wn;)La  
 bTray=FALSE; +0?1"2  
} D4\[D8pD  
 fDloL  
void CCaptureDlg::OnChange() 'b0r?A~c=  
{ Y1ks'=c>  
 RegisterHotkey(); SpImd IpD  
} j9rxu$N+  
;80^ GDk~S  
BOOL CCaptureDlg::RegisterHotkey() ! B92W  
{ OD9z7*E@  
 UpdateData(); !,dp/5 V  
 UCHAR mask=0; XF+4*),  
 UCHAR key=0; I(Z\$  
 if(m_bControl) zu.B>INe  
  mask|=4; 51u\am'T  
 if(m_bAlt) ?;_*8Doq-a  
  mask|=2; 3vKTCHbk9  
 if(m_bShift) J?dLI_{ <  
  mask|=1; ! Sw=ns7  
  key=Key_Table[m_Key.GetCurSel()]; x0b=r!Duu  
 if(bRegistered){ zO---}[9a  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); h5rR44  
  bRegistered=FALSE; BN `2UVH  
 } :G6aO  
 cMask=mask; r^a:s]  
 cKey=key; T-#4hY`  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `/Rqt+C  
 return bRegistered; c6lCF &  
} [_nOo`  
5|=J\Lp2I  
  四、小结 9|lLce$  
WrSc@j&Ycv  
  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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