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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: h+Yd \k  
  T\= #y  
  一、实现方法 j(K)CHH  
FU J<gqL  
  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: rwio>4=  
$/@  L  
#pragma data_seg("shareddata") !y>up+cRjl  
HHOOK hHook =NULL; //钩子句柄 4i }nk T  
UINT nHookCount =0; //挂接的程序数目 B*Om\I  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 vW!O("\7K<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 W,H=K##6<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 'Nuy/\[{\  
static int KeyCount =0; v&d'ABeT  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2mMi=pv9  
#pragma data_seg() ,=c(P9}^  
1CSGG'J]E  
  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。 ]\oT({$6B  
1;i|GXY:h  
  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 -K{  
^;9l3P{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ur=:Ha  
cKey,UCHAR cMask) mW+5I-~  
{ XzqB=iX  
 BOOL bAdded=FALSE; J P5en  
 for(int index=0;index<MAX_KEY;index++){ UIg?3J}R  
  if(hCallWnd[index]==0){ KsK]y,^Z  
   hCallWnd[index]=hWnd; bmi",UZ:F  
   HotKey[index]=cKey; yHlQKI  
   HotKeyMask[index]=cMask; sDTw</@  
   bAdded=TRUE; aJF/y3  
   KeyCount++; `L[q`r7  
   break; Am*lx  
  } )R?uzX^qf  
 } s,!vBSn8  
 return bAdded; 8bs'Ek{'o  
} kumo%TXB&  
//删除热键 *PB/I4>{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) BS,EW  
{ -1NR]#P'  
 BOOL bRemoved=FALSE; @g+v2(f2v  
 for(int index=0;index<MAX_KEY;index++){ iQT0%WaHl  
  if(hCallWnd[index]==hWnd){ }~ N\A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Ea'jAIFPpO  
    hCallWnd[index]=NULL; i gjn9p&_  
    HotKey[index]=0; 5K682+^5  
    HotKeyMask[index]=0; @]8flb )T  
    bRemoved=TRUE; BA@M>j6d  
    KeyCount--; *:"60fkoU  
    break; MLM/!N 7  
   } $>uUn3hSx\  
  } 4K dYiuz0`  
 } !$ii*}  
 return bRemoved; =h +SZXe<r  
} }Qe(6'l_  
D^P0X:T]  
%zRuIDmv  
  DLL中的钩子函数如下: P>)J:.tr0  
r!eW]M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8t, &dq  
{ Iw)m9h  
 BOOL bProcessed=FALSE; T5e#Ll/  
 if(HC_ACTION==nCode) :%j"l7=>  
 { )Y'g;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ZNk[Jn [.  
   switch(wParam) {hN<Ot  
   {  !7Qj8YmS  
    case VK_MENU: IR:{{ (  
     MaskBits&=~ALTBIT; I@O9bxR?  
     break; 8'b ZR]  
    case VK_CONTROL: JC~4B3!  
     MaskBits&=~CTRLBIT; Mqk|H~l5c  
     break; 9 BU#THDm  
    case VK_SHIFT: tq@)J_7|  
     MaskBits&=~SHIFTBIT; eY^zs0  
     break; -%P}LaC <  
    default: //judge the key and send message <exyd6iI  
     break; >SziRm>Y7  
   } 9=/4}!.  
   for(int index=0;index<MAX_KEY;index++){ =OV5DmVmQ  
    if(hCallWnd[index]==NULL) cXf/  
     continue; \-{$IC-L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) llh +r?  
    { |M t2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _s5FYb#  
     bProcessed=TRUE; LjW32>B  
    } +|8.ymvm  
   } ZG#:3d*)  
  } 8y_(Iu|:  
  else if((lParam&0xc000ffff)==1){ //有键按下 c9Cc%EK  
   switch(wParam) -e_TJA  
   { =5fY3%^b{  
    case VK_MENU: 7IkEud  
     MaskBits|=ALTBIT; ht>/7.p]  
     break; $]}K;  
    case VK_CONTROL: ;#IrHR*Bk  
     MaskBits|=CTRLBIT; K7(k_4  
     break; Jg{K!P|i  
    case VK_SHIFT: Y"KJ`Rx  
     MaskBits|=SHIFTBIT; &b*v7c=o  
     break; 4${3e Sg_  
    default: //judge the key and send message _5(p=Zc  
     break; w L>*WLfR  
   } #2:?N8vz*  
   for(int index=0;index<MAX_KEY;index++){ Lp@Al#X55  
    if(hCallWnd[index]==NULL) 5WxNH}{  
     continue; (a-Lx2T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qp#Euq6  
    { O0`ofFN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); AFvv+ ss  
     bProcessed=TRUE; 77aUuP7Iw  
    } n_LK8  
   } z[R dM#L  
  } ZU.E}Rn:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 6-/W4L)?>  
   for(int index=0;index<MAX_KEY;index++){ qvGm JN0  
    if(hCallWnd[index]==NULL) COw!a\Jl  
     continue; ZF#n(Y?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 'Z9UqEGV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); a MFUj+^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 n c~JAT# '  
   } :AqtPV'  
  } DrAIQ7Jd  
 } aj .7t =^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )1@%!fr  
} ,D(Bg9C  
ePv`R'#  
  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: 9kqR-T|Q  
fZsw+PSy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vSoG] :1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PvjZoF["  
`U\l: ~]e  
  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: T3"'`Sd9;  
KC2Z@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8f)pf$v`   
{ t98S[Z(-%+  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) eX}aa0  
 { '/0e!x/8  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \Zx&J.D  
  SaveBmp(); L2}<2  
  return FALSE; Ars*H,9>e  
 } f2SJ4"X  
 …… //其它处理及默认处理 4@<wN \'  
} Y+vIU*O  
+\&6Zbn  
i`];xNR'  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 O<,\ tZ'N  
@]2aPs} }6  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 w,R6:*p5  
F9% +7Op^  
  二、编程步骤 xSlgq|8  
zzo93d  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; `ZM$\Q=:  
8)pL0bg  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; J9j @V4  
VnB HQ.C  
  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; ;XjXv'  
B^GMncZO  
  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; <Uf`'X\e6  
Cd]A1<6s  
  5、 添加代码,编译运行程序。 a&)!zhVP  
P(Zj}tGN  
三、程序代码 8==M{M/eM  
KQ81Oxu*C  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL tf8xc  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) C|w<mryx  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ H`URJ8k$Q  
#if _MSC_VER > 1000 4/mz>eK"  
#pragma once }-XZ1qr  
#endif // _MSC_VER > 1000 cwtlOg  
#ifndef __AFXWIN_H__ ~[og\QZX  
#error include 'stdafx.h' before including this file for PCH Vmh$c*TE  
#endif W _Hoa*~  
#include "resource.h" // main symbols ~@X3qja  
class CHookApp : public CWinApp =ePX^J*M'  
{ =Bm|9A1  
 public: \)>#`X  
  CHookApp(); IqsUtWSp  
  // Overrides '!?t+L%gO  
  // ClassWizard generated virtual function overrides >g~IP>  
  //{{AFX_VIRTUAL(CHookApp) t# y,9>6  
 public:  6Bcr.`  
  virtual BOOL InitInstance(); 1n7'\esC*  
  virtual int ExitInstance(); $G }9iV7  
  //}}AFX_VIRTUAL h#Z,ud_  
  //{{AFX_MSG(CHookApp) P2C>IS  
  // NOTE - the ClassWizard will add and remove member functions here. P{_%p<:V  
  // DO NOT EDIT what you see in these blocks of generated code ! I\c7V~^hnG  
  //}}AFX_MSG ONy\/lu|  
  DECLARE_MESSAGE_MAP() %N(>B_t\  
}; #9.%>1{6Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); t?Q bi)T=z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); BtKor6ba  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Hy,""Py  
BOOL InitHotkey(); 6Uq;]@k%  
BOOL UnInit(); Zz/p'3?#  
#endif *fv BB9raq  
;~d$O M  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. >#l: ]T  
#include "stdafx.h" -%%Xx5D  
#include "hook.h" Sj|tR[SAoD  
#include <windowsx.h> EEK!'[<,sE  
#ifdef _DEBUG XE2rx2k  
#define new DEBUG_NEW .oTS7rYw  
#undef THIS_FILE e"bzZ!c&~V  
static char THIS_FILE[] = __FILE__; L$ sENOm  
#endif ^ACrWk~UY  
#define MAX_KEY 100 J-uQF|   
#define CTRLBIT 0x04 |s(Ih_Zn  
#define ALTBIT 0x02 2]5Li/   
#define SHIFTBIT 0x01 0rI/$  
#pragma data_seg("shareddata") -{9mctt/gE  
HHOOK hHook =NULL; ;bg]H >$U7  
UINT nHookCount =0; *jPd=+d  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey wQd8/&mmk  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT dPf7o   
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ST?Rl@4  
static int KeyCount =0; 2cIKph  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ONDO xXs  
#pragma data_seg() G%>[7]H  
HINSTANCE hins; >G%oWRk  
void VerifyWindow(); oJ3(7Sz  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) +r;t]  
//{{AFX_MSG_MAP(CHookApp) `zw%  
// NOTE - the ClassWizard will add and remove mapping macros here. CnZEBAU  
// DO NOT EDIT what you see in these blocks of generated code! 3"v>y]$U  
//}}AFX_MSG_MAP ']I!1>v$[  
END_MESSAGE_MAP() o~\.jQQxa  
lA1  
CHookApp::CHookApp() y06**f)  
{ xfI0P0+  
 // TODO: add construction code here, i4h`jFS  
 // Place all significant initialization in InitInstance 9%NobT  
} $ xHtI]T  
^E8qI8s  
CHookApp theApp; q 165S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) OgC,oj,!/  
{ /je $+  
 BOOL bProcessed=FALSE; Rf>)#hn%  
 if(HC_ACTION==nCode) ^ +@OiL>&i  
 { La '6k  
  if((lParam&0xc0000000)==0xc0000000){// Key up ~OR^  
   switch(wParam) aT}Hc5L,b  
   { !vpXXI4  
    case VK_MENU: (jj`}Qe3U  
     MaskBits&=~ALTBIT; <Z.{q Zd  
     break; !QbuOvw  
    case VK_CONTROL: t1J3'lS  
     MaskBits&=~CTRLBIT; i\b^}m8c.N  
     break; 8Yf*vp>T/x  
    case VK_SHIFT: (s&]V49  
     MaskBits&=~SHIFTBIT; \-[bU6\A\  
     break; }79jyS-e  
    default: //judge the key and send message /d:hW4}<}.  
     break; Y_jc*S  
   } oPni4^g i  
   for(int index=0;index<MAX_KEY;index++){ zaLPPm&f  
    if(hCallWnd[index]==NULL) }+pwSjsno  
     continue; W SxoGly  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) srAWet  
    { .Tq8Qdl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); MusUgBQy  
     bProcessed=TRUE; kV T |(Y  
    } YG:^gi  
   } (Sgsy^|N  
  } z~~pH9=c2  
  else if((lParam&0xc000ffff)==1){ //Key down 6m(? (6+;K  
   switch(wParam) jIrfJ*z  
   { $':5uU1}  
    case VK_MENU: T|D^kL%m!  
     MaskBits|=ALTBIT; ty"L&$bf  
     break; Z4As'al  
    case VK_CONTROL: %cUC~, g_(  
     MaskBits|=CTRLBIT; 00dY?d{[D  
     break; ]cS(2hP7  
    case VK_SHIFT: 4;AQ12<[1  
     MaskBits|=SHIFTBIT; O< /b]<[  
     break; kBrA ?   
    default: //judge the key and send message F!u)8>s+z{  
     break; se2Y:v  
   } \aM-m:J  
   for(int index=0;index<MAX_KEY;index++) _a& Z$2O  
   { Z8Y& #cB  
    if(hCallWnd[index]==NULL) PI`Y%!P  
     continue; 9@q!~ur  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >4kQ9lXL  
    { Qb>("j~Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); c_+fA  
     bProcessed=TRUE; 3%GsTq2o  
    } $|J+  
   } Xxd D)I  
  } 6Y,&q|K  
  if(!bProcessed){ o -)[{o\  
   for(int index=0;index<MAX_KEY;index++){ j n SZ@u  
    if(hCallWnd[index]==NULL) G/# <d-}_  
     continue; Al8Dw)uG{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) SG\ /m'F  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G<<; a  
   } YLA(hg|  
  } wXqwb|2  
 } iV?8'^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^lZ7%6  
} pKj:)6t"  
ip}%Y6Wj  
BOOL InitHotkey() Y%eW6Y#  
{ ':_gYA  
 if(hHook!=NULL){ >#;;g2UV  
  nHookCount++;  WTl0}wi  
  return TRUE; SSE,G!@  
 } O{\<Izm`D  
 else VBDb K|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); MmvOyK NZF  
  if(hHook!=NULL) $^ ^M&[b-  
   nHookCount++; B]<N7NYn1  
  return (hHook!=NULL); =FIZh}JD  
} HDzeotD  
BOOL UnInit() @jMo/kO/A  
{ -X7x~x-  
 if(nHookCount>1){ !A% vR\  
  nHookCount--; CVkJMH_  
  return TRUE; ^b|? ?9&  
 } SIR2 Kc0  
 BOOL unhooked = UnhookWindowsHookEx(hHook); GeB&S!F  
 if(unhooked==TRUE){  ?f'`b<o  
  nHookCount=0; Hmhsb2`\  
  hHook=NULL; jCNR63/  
 } Nb_Glf  
 return unhooked; t B`"gC~  
}  f-[.^/  
Ps\4k#aOv  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sg}<()  
{ ,%xat`d3,3  
 BOOL bAdded=FALSE; 4f8XO"k7t=  
 for(int index=0;index<MAX_KEY;index++){ @g;DA)!(  
  if(hCallWnd[index]==0){ %++: K  
   hCallWnd[index]=hWnd; }93FWo.  
   HotKey[index]=cKey; eX"Ecl{  
   HotKeyMask[index]=cMask; z@\mn  
   bAdded=TRUE; vShB26b  
   KeyCount++; =+T0[|gc(r  
   break; ,98 F  
  } o_Y?s+~i[/  
 } VZ`YbY  
 return bAdded; tS3&&t  
} I/A%3i=H  
g5Io=e@s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !- QB>`7$  
{ 0k?]~ f  
 BOOL bRemoved=FALSE; Y`-q[F?\y  
 for(int index=0;index<MAX_KEY;index++){ t4:/qy  
  if(hCallWnd[index]==hWnd){ 7zE1>.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ m zoH$@  
    hCallWnd[index]=NULL; =X[?d/[  
    HotKey[index]=0; GtIAsC03  
    HotKeyMask[index]=0; Yqo@ g2g  
    bRemoved=TRUE; m3P7*S5NJ7  
    KeyCount--; *,O3@,+>H  
    break; 9 lG a*f)  
   } X_D-K F  
  } f]?&R c2C  
 } ZK'WKC  
 return bRemoved; 4s_5>r4  
} ]K>bSK^TX  
z%+rI  
void VerifyWindow() [U^Cz{G  
{  g;AW  
 for(int i=0;i<MAX_KEY;i++){ b|kL*{;  
  if(hCallWnd!=NULL){ `uusUw-Gf  
   if(!IsWindow(hCallWnd)){ z+wegF  
    hCallWnd=NULL; c>/7E-T  
    HotKey=0; '3Fb[md54  
    HotKeyMask=0; N:+EGmp  
    KeyCount--; a x;<idC}  
   } Zj ^e8u=T  
  } \j wxW6>  
 } p*YV*Arv  
} DyZ6&*s$  
Ujvm|ml  
BOOL CHookApp::InitInstance() :cXN Fu\C  
{ MuzQ z.C  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7AGUi+!ICl  
 hins=AfxGetInstanceHandle(); D[6sy`5l  
 InitHotkey(); ".#h$  
 return CWinApp::InitInstance(); ~Cynw(  
} e F}KOOfC  
;Q/1l=Bn  
int CHookApp::ExitInstance() OR+py.vK  
{ awQGu,<N  
 VerifyWindow(); :2vuc!Pu  
 UnInit(); j8^ #698X  
 return CWinApp::ExitInstance(); t*Z5{   
} FBouXu#  
!lsa5w{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file e!w2_6?3  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Q/j#Pst  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ I*cb\eU8Y  
#if _MSC_VER > 1000 ]uh/!\  
#pragma once 7o!t/WEEq  
#endif // _MSC_VER > 1000 {]m/15/$C  
BAi0w{  
class CCaptureDlg : public CDialog w6mYLK%  
{ @/$i -?E  
 // Construction !>Q\Y`a,*  
 public: ^vxNS[C`;  
  BOOL bTray; q?]KZ_a  
  BOOL bRegistered; aAn p7\7  
  BOOL RegisterHotkey(); 017nhI  
  UCHAR cKey; 8o $ ` '  
  UCHAR cMask; 6jm/y@|F!  
  void DeleteIcon(); u%"5<ll  
  void AddIcon(); ;Kg7}4`I  
  UINT nCount; D97 vfC  
  void SaveBmp(); >X"\+7bw  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor hPgYKa8u  
  // Dialog Data pSYEC,0B  
  //{{AFX_DATA(CCaptureDlg) SsfC m C  
  enum { IDD = IDD_CAPTURE_DIALOG }; CMv8n@ry  
  CComboBox m_Key; D ZH2U+K  
  BOOL m_bControl; Hm|N {  
  BOOL m_bAlt; P39oHW  
  BOOL m_bShift; ~P~q'  
  CString m_Path;  OmfHr lA  
  CString m_Number; S-7C'dc  
  //}}AFX_DATA pbWjTI$  
  // ClassWizard generated virtual function overrides jt*B0'Sa  
  //{{AFX_VIRTUAL(CCaptureDlg) q3K}2g  
 public: %hH> %  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Up_"qD6  
 protected: T;PLUjp}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support A>FWvlLw'm  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); N Mx:Jh-YN  
  //}}AFX_VIRTUAL Y!Io @{f  
  // Implementation m$pRA0s2`  
 protected: [!uVo>Q4  
  HICON m_hIcon; ^1_[UG  
  // Generated message map functions AqaMi  
  //{{AFX_MSG(CCaptureDlg) rp[3?-fk  
  virtual BOOL OnInitDialog(); QX=x^(M$m  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); yO7#n0q  
  afx_msg void OnPaint(); :c8d([)$  
  afx_msg HCURSOR OnQueryDragIcon(); a=9QwEZ  
  virtual void OnCancel(); o Qo5y_o~  
  afx_msg void OnAbout(); &Ll&A@yU  
  afx_msg void OnBrowse(); A McZm0c`  
  afx_msg void OnChange(); !3DY#  
 //}}AFX_MSG $ O[Y  
 DECLARE_MESSAGE_MAP() I-Ut7W  
}; *_}0vd  
#endif _bgv +/  
YGc:84S  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file )_4()#3  
#include "stdafx.h" {5d 5Y%&  
#include "Capture.h" =2} kiLKO  
#include "CaptureDlg.h" vr2PCG[~  
#include <windowsx.h> ),xD5~_=q  
#pragma comment(lib,"hook.lib") &"J;  
#ifdef _DEBUG wg\ p&avvb  
#define new DEBUG_NEW \ptjnwC^O  
#undef THIS_FILE SN\c 2^#  
static char THIS_FILE[] = __FILE__; 0O*kC43E_  
#endif p7r/`_'|  
#define IDM_SHELL WM_USER+1 tp&|*M3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cKoW5e|u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @tD (<*f+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; m_`%#$s}  
class CAboutDlg : public CDialog 'lu3BQvfh  
{ )Z['=+s%  
 public: _G25$%/LU  
  CAboutDlg(); Un T\6u  
  // Dialog Data r=54@`O!  
  //{{AFX_DATA(CAboutDlg) SR?(z  
  enum { IDD = IDD_ABOUTBOX }; %&V%=-O_7  
  //}}AFX_DATA S)4p'cUwq  
  // ClassWizard generated virtual function overrides HTvUt*U1  
  //{{AFX_VIRTUAL(CAboutDlg) h@(+(fVHrp  
 protected: n}(A4^=4KQ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K1]3zLnS  
  //}}AFX_VIRTUAL *-Vr=e<8   
  // Implementation %yk_(3a  
 protected: o[+t}hC[  
  //{{AFX_MSG(CAboutDlg) wArfnB&  
  //}}AFX_MSG 8~TKiR5  
  DECLARE_MESSAGE_MAP() ReA-.j_2@  
}; Vi}E9I4  
4fjwC,,  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) X:g#&e_  
{ 'V&Uh]>  
 //{{AFX_DATA_INIT(CAboutDlg) x',6VTz^  
 //}}AFX_DATA_INIT &`tAQN*Z  
} 4udj"-V  
urCTP.F  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~{vB2  
{ kY{$[+-jR  
 CDialog::DoDataExchange(pDX); LNHi }P~  
 //{{AFX_DATA_MAP(CAboutDlg) ~<s =yjTu+  
 //}}AFX_DATA_MAP b`^Q ':^A  
} :g^ mg-8  
+"=ydF.9  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4i^WE;|s  
 //{{AFX_MSG_MAP(CAboutDlg) K{"hf:k  
 // No message handlers W-/V5=?   
 //}}AFX_MSG_MAP {>~9?Xwh   
END_MESSAGE_MAP() CA5`uh  
N#t`ZC&m'  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D3P/: 4  
: CDialog(CCaptureDlg::IDD, pParent) t4/ye>P &  
{ P t/]Z<VL  
 //{{AFX_DATA_INIT(CCaptureDlg) lI.oyR'  
  m_bControl = FALSE; DX+zK'34  
  m_bAlt = FALSE; C_8_sb Z/  
  m_bShift = FALSE; Q>rr?L`  
  m_Path = _T("c:\\"); cY kb3(  
  m_Number = _T("0 picture captured."); >!a- "  
  nCount=0; RtpV08s\  
  bRegistered=FALSE; /@\R  
  bTray=FALSE; BzO,(bd!PI  
 //}}AFX_DATA_INIT RwOOe7mv  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 SPt/$uYJ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |g!d[ct]  
} ^m&P0  
u#Jr_ze  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 32%Fdz1S  
{ *h3iAcM8  
 CDialog::DoDataExchange(pDX); K5 BL4N  
 //{{AFX_DATA_MAP(CCaptureDlg) #d-zH:uq  
  DDX_Control(pDX, IDC_KEY, m_Key); eNVuw:Q+  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); u'>94Gm}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); TB+k[UxB  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); k,k>w#&  
  DDX_Text(pDX, IDC_PATH, m_Path); C1UU v=|  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1 ptyiy  
 //}}AFX_DATA_MAP [0]A-#J  
} ZILJXX4  
"*F`,I3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ~QxW^DGa7]  
//{{AFX_MSG_MAP(CCaptureDlg) B%MdJ D>  
 ON_WM_SYSCOMMAND() pq&[cA_w  
 ON_WM_PAINT() K%x]:|,>M  
 ON_WM_QUERYDRAGICON() g,]m8%GHE  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) J@6j^U  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) t H.L_< N  
 ON_BN_CLICKED(ID_CHANGE, OnChange) QeuM',6R  
//}}AFX_MSG_MAP =|ODa/2 p  
END_MESSAGE_MAP() [3nWxFz$R  
dr:x0>  
BOOL CCaptureDlg::OnInitDialog() Xo/H+[;X  
{ cy;i1#1rO  
 CDialog::OnInitDialog(); vO~  Tx  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); CE c(2q+%i  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]77f`<q<}!  
 CMenu* pSysMenu = GetSystemMenu(FALSE); [WG\w j.  
 if (pSysMenu != NULL) *q k7e[IP  
 { liH#=C8l*%  
  CString strAboutMenu; 'Kbrz  
  strAboutMenu.LoadString(IDS_ABOUTBOX); wL="p) TO.  
  if (!strAboutMenu.IsEmpty()) t&J A1|q  
  { QDJ "X  
   pSysMenu->AppendMenu(MF_SEPARATOR);  QSY>8P  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); $/ IFSB9  
  } +,LWyvc'  
 } 4_ U"M@  
 SetIcon(m_hIcon, TRUE); // Set big icon dgoAaS2M  
 SetIcon(m_hIcon, FALSE); // Set small icon HdB>CVuh  
 m_Key.SetCurSel(0); W.jXO"pN  
 RegisterHotkey(); .O5V;&,  
 CMenu* pMenu=GetSystemMenu(FALSE); m:[I$b6AY  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Q [rZ1z  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); UF#!6"C@  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); jga\Ry=nw  
 return TRUE; // return TRUE unless you set the focus to a control 9,`i[Dzp  
} rVoV@,P  
T>rmm7F  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) V@#oQi*  
{ ob;|%_  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) z06,$OYz  
 { /YHO"4Z  
  CAboutDlg dlgAbout; d-+jb<C&  
  dlgAbout.DoModal(); 3-{BXht)  
 } 3c3;8h$k  
 else _ s3d$C?B  
 { b&&l   
  CDialog::OnSysCommand(nID, lParam); 72Y 6gcg  
 } NGl 8*Af   
} oYZ  4F  
7KhS{w6  
void CCaptureDlg::OnPaint() rMbq_5}  
{ 0r1GGEW`s  
 if (IsIconic()) $">j~!'  
 { nf 8V:y4  
  CPaintDC dc(this); // device context for painting FrXP"U}Y  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); N n FR;  
  // Center icon in client rectangle R2sG'<0B0  
  int cxIcon = GetSystemMetrics(SM_CXICON); [B)!  
  int cyIcon = GetSystemMetrics(SM_CYICON); ~at@3j}W  
  CRect rect; fP|[4 ku  
  GetClientRect(&rect); In96H`  
  int x = (rect.Width() - cxIcon + 1) / 2; ;6[6~L%K}  
  int y = (rect.Height() - cyIcon + 1) / 2; 8$\j| mN  
  // Draw the icon wPjq B{!Q  
  dc.DrawIcon(x, y, m_hIcon); ZxwrlaA  
 } %N<5ST>(  
 else hDJG.,r  
 { )PP yJ@M  
  CDialog::OnPaint(); 8e*skL  
 } K%\r[NF  
} yT@Aj;X0v  
a- rR`  
HCURSOR CCaptureDlg::OnQueryDragIcon() @`4T6eL5  
{ ^ WO3,  
 return (HCURSOR) m_hIcon; {jB> ]7  
} e,e(t7c?d  
'QT~o-U  
void CCaptureDlg::OnCancel() kWZY+jyt P  
{ W{"sB:E  
 if(bTray) ?I[8rzBWU  
  DeleteIcon(); lTMY|{9  
  CDialog::OnCancel(); O?Bf (y  
} v7 *L3Ol  
nXLz<wE  
void CCaptureDlg::OnAbout() VRQ`-#  
{ c.IUqin  
 CAboutDlg dlg; znsQ/[  
 dlg.DoModal(); zY_J7,0g  
} *O~y6|U?  
` 5Kg[nB:  
void CCaptureDlg::OnBrowse() s;OGb{H7  
{ Qq`S=:}~x  
 CString str; rz%~=Ca2j  
 BROWSEINFO bi; :C} I6v=  
 char name[MAX_PATH]; lK=Is v+  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); u_^mN9h  
 bi.hwndOwner=GetSafeHwnd(); IRm}?hHf  
 bi.pszDisplayName=name; ,Zn6T"[$  
 bi.lpszTitle="Select folder"; H%vfRl3rB  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; >S7t  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  k;+TN9  
 if(idl==NULL) h8`On/Ur_8  
  return; l&+O*=#Hh  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); A[+)PkR  
 str.ReleaseBuffer(); *HR pbe2  
 m_Path=str; ?K[Y"*y2  
 if(str.GetAt(str.GetLength()-1)!='\\') j9 >[^t3U  
  m_Path+="\\"; Unb2D4&'  
 UpdateData(FALSE); z1Ieva]  
} zK5&,/  
,6;n[p"h|r  
void CCaptureDlg::SaveBmp() *pwkv7Z h  
{ 6^LXctW.  
 CDC dc; ):G%o  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); U*=E(l  
 CBitmap bm; SPb +H19;  
 int Width=GetSystemMetrics(SM_CXSCREEN); 0* F` h  
 int Height=GetSystemMetrics(SM_CYSCREEN); f X[xZGV,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); E,Rj;?  
 CDC tdc; UF!qp  
 tdc.CreateCompatibleDC(&dc); d*d:-f~q  
 CBitmap*pOld=tdc.SelectObject(&bm); 3O2G+G2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); rH`\UZ{cc  
 tdc.SelectObject(pOld); prj(  
 BITMAP btm; 0Gs\x  
 bm.GetBitmap(&btm); F}u'A,Hc  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; _gqqPny4$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); c1k[)O~  
 BITMAPINFOHEADER bih; ;Yee0O!d4  
 bih.biBitCount=btm.bmBitsPixel; !y b06Z\f  
 bih.biClrImportant=0; }9"'' Z  
 bih.biClrUsed=0; )&1v[]%S  
 bih.biCompression=0; ^H.B6h?  
 bih.biHeight=btm.bmHeight; Fa>f'VXx  
 bih.biPlanes=1; #4bT8kq  
 bih.biSize=sizeof(BITMAPINFOHEADER); u4~+Bc_GL  
 bih.biSizeImage=size; >whv*@Fr  
 bih.biWidth=btm.bmWidth; OK80-/8HI  
 bih.biXPelsPerMeter=0; "++\6 H<  
 bih.biYPelsPerMeter=0; 1@L18%h  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); n/5T{NfG  
 static int filecount=0; ,<%uG6/",g  
 CString name; 2/ 4zg  
 name.Format("pict%04d.bmp",filecount++); t <` As6}  
 name=m_Path+name; Nj4CkMM[3  
 BITMAPFILEHEADER bfh; ]oV{JR]  
 bfh.bfReserved1=bfh.bfReserved2=0;  b M1\z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); |iH MAo  
 bfh.bfSize=54+size; g&  e u  
 bfh.bfOffBits=54; \lQ3j8 U  
 CFile bf; bIiun a\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ y{@\8B]  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); oM!&S'M/  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); k 3m_L-  
  bf.WriteHuge(lpData,size); [=(8yUV'G  
  bf.Close(); l9f_NJHo  
  nCount++; ~-zIB=TyK  
 } lk 1\|Q I  
 GlobalFreePtr(lpData); 53:~a  
 if(nCount==1) <8b1OdA  
  m_Number.Format("%d picture captured.",nCount); (U&  
 else Np+PUu>  
  m_Number.Format("%d pictures captured.",nCount); 5bt>MoKxv  
  UpdateData(FALSE); i6KfH\{N  
} > mO*.'Gm  
pRun5 )7  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4tCM 2it%  
{ Vr},+Rj  
 if(pMsg -> message == WM_KEYDOWN) I*N"_uKU  
 { -NJpql{Cb  
  if(pMsg -> wParam == VK_ESCAPE) 9s"st\u 4  
   return TRUE; Z>`\$1CI  
  if(pMsg -> wParam == VK_RETURN) N~=I))i  
   return TRUE; y-3'qq'E  
 } ^ 4<D%\  
 return CDialog::PreTranslateMessage(pMsg); T>asH  
} .1[.f}g$J  
'{2]:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  c`xNTr01  
{ QZ&(e2z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [cnu K  
  SaveBmp(); Br9j)1;  
  return FALSE; <Ja&z M  
} 1+Gq<]@G  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ T]wI)  
 CMenu pop; 1M&Lb. J6  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >Y08/OAI.2  
 CMenu*pMenu=pop.GetSubMenu(0); jl P*RX  
 pMenu->SetDefaultItem(ID_EXITICON); Sh!c]r>\Q  
 CPoint pt; L4Jm8sy{  
 GetCursorPos(&pt); jcqUY+T$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 'UsR/h5T  
 if(id==ID_EXITICON) `TJhH<z"%  
  DeleteIcon(); ^ nPy(Q0  
 else if(id==ID_EXIT) O(W"QY  
  OnCancel(); Nb$0pc1J<  
 return FALSE; mzK0$y #*o  
} D-/6RVq0m  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ;F258/J  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) "BSY1?k{  
 AddIcon(); IVh5SS  
 return res; /GGyM]k3  
} UH>~Y N  
<5E'`T  
void CCaptureDlg::AddIcon() ch8VJ^%Ra1  
{ 4u iq'-  
 NOTIFYICONDATA data; i6V$mhL  
 data.cbSize=sizeof(NOTIFYICONDATA); 6#U~>r/  
 CString tip; !tTv$L>  
 tip.LoadString(IDS_ICONTIP);  ~frsgHW  
 data.hIcon=GetIcon(0); 68z#9}  
 data.hWnd=GetSafeHwnd(); Sqn>L`Lz  
 strcpy(data.szTip,tip); mvjx &+q  
 data.uCallbackMessage=IDM_SHELL; nKGQU,C  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @ 3=pFYW)  
 data.uID=98; $^fF}y6N  
 Shell_NotifyIcon(NIM_ADD,&data); 1TQ?Fxj  
 ShowWindow(SW_HIDE); Xq$-&~   
 bTray=TRUE; @!")shc  
} 73X*|g  
^}~Q(ji7  
void CCaptureDlg::DeleteIcon() hOB<6Tm[  
{ n' mrLZw  
 NOTIFYICONDATA data; Hes!uy  
 data.cbSize=sizeof(NOTIFYICONDATA); o>M^&)Xs  
 data.hWnd=GetSafeHwnd(); myA;Y  
 data.uID=98; 9wR D=a  
 Shell_NotifyIcon(NIM_DELETE,&data); t}R!i-D|HB  
 ShowWindow(SW_SHOW); 8j>V?'Szk  
 SetForegroundWindow(); S} UYkns*  
 ShowWindow(SW_SHOWNORMAL); R7Qj<,  
 bTray=FALSE; ~}b0zL  
} n3$=&   
Q$U.vF7BnP  
void CCaptureDlg::OnChange() }BM`4/  
{ >;Hx<FKxP  
 RegisterHotkey(); (X@\2M4@T#  
} qR cSB  
HjK8y@j  
BOOL CCaptureDlg::RegisterHotkey() .fzyA5@l  
{ 7Y@]o=DIc  
 UpdateData(); FL\pgbI  
 UCHAR mask=0; ^rfR<Q`  
 UCHAR key=0; (m2%7f.I  
 if(m_bControl) 1SjVj9{:  
  mask|=4; q,ie)`  
 if(m_bAlt) y?UJ <QAi  
  mask|=2; TI3xt-/  
 if(m_bShift) 3q4Zwv0z20  
  mask|=1; 6k0Awcr  
  key=Key_Table[m_Key.GetCurSel()]; XcoX8R%U  
 if(bRegistered){ 9!=4}:+  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,5zY1C==Ut  
  bRegistered=FALSE; 1L::Qu%E  
 } A~Sc ] M  
 cMask=mask; (DvPdOT+3  
 cKey=key; WILa8"M  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); f.J^HQ_  
 return bRegistered; |I1,9ex  
} !X7z y9  
O83J[YuzjN  
  四、小结 K7 C <}y  
k+{~#@  
  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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