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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: J/LsL k  
  v|\3FEu@  
  一、实现方法 HxSq &j*F  
]-8WM5\qJM  
  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: 7-:R{&3Lm:  
vMd3#@  
#pragma data_seg("shareddata") UodBK7y  
HHOOK hHook =NULL; //钩子句柄 Ps!umV  
UINT nHookCount =0; //挂接的程序数目 A]Bf&+V  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 wXjidOd $  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 vj jVZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey n,U?]mr  
static int KeyCount =0; vd?Bk_d9k,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 m/z,MT74*J  
#pragma data_seg() B (Ps/  
m _cRK}>  
  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。 _j+!Fd  
t0+i ]lr  
  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: Jsl2RdI  
,AmwsXN"F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR dvZH~mF  
cKey,UCHAR cMask) N_I KH)  
{ 9w$m\nV  
 BOOL bAdded=FALSE; +$|fUn{  
 for(int index=0;index<MAX_KEY;index++){ (`S^6 -^  
  if(hCallWnd[index]==0){ h);^4cU  
   hCallWnd[index]=hWnd; s3HVX'   
   HotKey[index]=cKey; Q_U.J0  
   HotKeyMask[index]=cMask; _ Ao$)Gu)  
   bAdded=TRUE;  V\o7KF  
   KeyCount++; #~!"`B?#*  
   break; SRwD`FF  
  } 3w</B- |nQ  
 } tLBtE!J$[  
 return bAdded; <q8@a0e@  
} @@)2 12  
//删除热键 VGmvfhf#"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yEq7ueJ'  
{ ^Jp,&  
 BOOL bRemoved=FALSE; T1]?E]m{  
 for(int index=0;index<MAX_KEY;index++){ 1h&`mqY)L.  
  if(hCallWnd[index]==hWnd){ fC[za,PXaE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =5q<_as  
    hCallWnd[index]=NULL; f<NR6],}  
    HotKey[index]=0; N7?B"p/  
    HotKeyMask[index]=0; hbJ>GSoZ,  
    bRemoved=TRUE; ]K"&Vd  
    KeyCount--; N-gYamlQ  
    break; ZEAUoC1E1  
   } {drc}BL_  
  }  Y !?'[t  
 } dE7S[O  
 return bRemoved; s V_(9@b  
} f#\YX tR,k  
4f([EV[6dK  
}d<R 5  
  DLL中的钩子函数如下: )S caT1I  
{_QdB;VwH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !y= R)k  
{ ;V xRaj?  
 BOOL bProcessed=FALSE; H$KO[mW}  
 if(HC_ACTION==nCode) [={mCGU  
 { rO'DT{Yt  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 !sb r!Qt  
   switch(wParam) Xw-[Sf]p  
   {  j]Jgz<  
    case VK_MENU: ;2p+i/sVj  
     MaskBits&=~ALTBIT; Yc:%2KZ"  
     break; vADiW~^Q^  
    case VK_CONTROL: Zh=a rlk  
     MaskBits&=~CTRLBIT; bGPE0}b  
     break; *doNPp)m  
    case VK_SHIFT: rtV`Q[E  
     MaskBits&=~SHIFTBIT; !%iHJwS#  
     break; /Mqhx_)>A  
    default: //judge the key and send message <+`%=r)4  
     break; 1( pHC  
   } Gv:~P_vBH[  
   for(int index=0;index<MAX_KEY;index++){ C=: <[_m`  
    if(hCallWnd[index]==NULL) %rzPh<>e  
     continue; ?=VvFfv%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IH]9%d)  
    { 3JCo!n0   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); '7Gv_G_  
     bProcessed=TRUE; {&  o^p!  
    } XLN bV?  
   } xa>| k>I  
  } G]^[i6PQs  
  else if((lParam&0xc000ffff)==1){ //有键按下 oQ$yr^M  
   switch(wParam) Lc3&\q e  
   { Dw-d`8*  
    case VK_MENU: fab'\|Y   
     MaskBits|=ALTBIT; jvzioFCt  
     break; p3Sh%=HE'  
    case VK_CONTROL: h>N}M}8  
     MaskBits|=CTRLBIT; YH&=cI@  
     break; x9_mlZ  
    case VK_SHIFT: Z_d"<k}I  
     MaskBits|=SHIFTBIT; uO?+vYAN  
     break; B`*,L\LZ*  
    default: //judge the key and send message $ghZ<Y2}9  
     break; 5)[~ T2j!  
   } ?,} u6tH  
   for(int index=0;index<MAX_KEY;index++){ 5KCB^`|b>t  
    if(hCallWnd[index]==NULL) sX>u.  
     continue; 0RUk^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YOCEEh?  
    { "M I';6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %y1!'R:ZW  
     bProcessed=TRUE; 9T,/R1N8  
    } &!!*xv-z  
   } 7_0 p& 3  
  } |3H+b,M5  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Up9{aX  
   for(int index=0;index<MAX_KEY;index++){ PwY/VGT  
    if(hCallWnd[index]==NULL) )>volP  
     continue; *Gsj pNr-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) D=tZ}_'{t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mH*ldf;J;=  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 RNg?o [S  
   } LPk@t^[  
  } D3pz69W  
 } .[|UNg  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1{}p_"s>  
} nl@an!z  
PEMkx"h +  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: G6SgVaM  
N& _~y|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *}[\%u$ T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "wUIsuG/p  
_O9V"DM  
  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: ]#!uke Q  
@]\fO)\f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4kOO3[r  
{ %mI0*YRma  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) j3-YZKpg  
 { XLh)$rZ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 )"?4d[ 5  
  SaveBmp(); i'~-\F!  
  return FALSE; m/HT3<F  
 } sdp&D@  
 …… //其它处理及默认处理 spK8^sh  
} uvys>]+  
FU`(mQ*Yd  
\#sD`O  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ;vx5 =^7P  
8}/DD^M  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 h~dQ5%  
8%rD/b6`  
  二、编程步骤 }{0}$#z u  
R2bqhSlF  
  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"; >P6"-x,["  
C{)1#<`  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; dSI"yz  
+Y;P*U}Qg[  
  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; _H]\  
!-I,Dh-A  
  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; n ]%2Kx  
4jT6h9%  
  5、 添加代码,编译运行程序。 aq,1'~8XR  
%h. zkocM  
三、程序代码 ct+F\:e  
q~{) {t;  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL LKN7L kl  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) c[@_t.%)  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5D s[?  
#if _MSC_VER > 1000 ;`AB-  
#pragma once ixTjXl2g  
#endif // _MSC_VER > 1000 D]]e6gF$e  
#ifndef __AFXWIN_H__ J+D|/^  
#error include 'stdafx.h' before including this file for PCH $q!A1Fgk0  
#endif U1\EwBK8*T  
#include "resource.h" // main symbols _{|a<Keq|  
class CHookApp : public CWinApp ~!uX"F8Xl  
{ :s)cTq|3  
 public: ^sv|m"  
  CHookApp(); X G#?fr}L  
  // Overrides ` w;Wud'*<  
  // ClassWizard generated virtual function overrides 1$cl "d`~  
  //{{AFX_VIRTUAL(CHookApp) TE`5i~R*  
 public: O:BdZ5 b  
  virtual BOOL InitInstance(); Q0A4}  
  virtual int ExitInstance(); M+"6VtZH  
  //}}AFX_VIRTUAL nD i^s{  
  //{{AFX_MSG(CHookApp) WZa6*pF  
  // NOTE - the ClassWizard will add and remove member functions here. XtCIUC{r,  
  // DO NOT EDIT what you see in these blocks of generated code ! tPyk^NJ;  
  //}}AFX_MSG ^y,h0?Z9  
  DECLARE_MESSAGE_MAP() wv~:^v'  
}; he|Q (?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 4!sK>l!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @9^OHRZX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `2>p#`  
BOOL InitHotkey(); $f@YQN=  
BOOL UnInit(); t?hfP2&6  
#endif 3a:Hx| Yg  
Z?P^Y%ls  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Q{~g<G  
#include "stdafx.h" Nuqmp7C  
#include "hook.h" <F^9ML+'  
#include <windowsx.h> MKbcJZe  
#ifdef _DEBUG ,nf}4  
#define new DEBUG_NEW cGm3LS6]*  
#undef THIS_FILE stG +4w  
static char THIS_FILE[] = __FILE__; Tm^kZuT{  
#endif kq| !{_  
#define MAX_KEY 100 v4e4,Nt  
#define CTRLBIT 0x04 P'wo+Tn*  
#define ALTBIT 0x02 y`9#zYgqA  
#define SHIFTBIT 0x01 4eWv).  
#pragma data_seg("shareddata") :uo)-9_  
HHOOK hHook =NULL; 1;[KBYUH  
UINT nHookCount =0; 75a3hPCZ  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Hn >VPz+I  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT H!*ypJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey !aSj1 2J  
static int KeyCount =0; 0n:cmML )D  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7R:j^"I@  
#pragma data_seg() A~xw:[zy$a  
HINSTANCE hins; =r+K2]z,L  
void VerifyWindow(); {|>'(iqH"w  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) yH('Vl  
//{{AFX_MSG_MAP(CHookApp) Cu`  
// NOTE - the ClassWizard will add and remove mapping macros here. t U}6^yc  
// DO NOT EDIT what you see in these blocks of generated code! '$Z)2fn7  
//}}AFX_MSG_MAP  kNK0KL  
END_MESSAGE_MAP() NzAh3k  
y pEMx'p  
CHookApp::CHookApp() J4ZHE\  
{ PVg<Ovi^d  
 // TODO: add construction code here, eL~xS: VT  
 // Place all significant initialization in InitInstance W,EIBgR(R5  
} &]YyV.  
s,r|p@^  
CHookApp theApp; i&m_G5u88  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) t Cb34Wpf  
{ w71YA#cg  
 BOOL bProcessed=FALSE; =/K)hI!u  
 if(HC_ACTION==nCode) CNb(\]  
 { TC-Vzk G|  
  if((lParam&0xc0000000)==0xc0000000){// Key up zg3kU65PJE  
   switch(wParam) e_e\Ie/pDc  
   { Y_Fn)(  
    case VK_MENU: $M)SsD~  
     MaskBits&=~ALTBIT; A:ts_*  
     break; k 6M D3c  
    case VK_CONTROL: ~qQZhu"  
     MaskBits&=~CTRLBIT; 3F]Dh^IR9  
     break; Yw#fQFm  
    case VK_SHIFT: Y Iwa =^  
     MaskBits&=~SHIFTBIT; F oC $X  
     break; =q0V%h{  
    default: //judge the key and send message }xC2~  
     break; S[!6Lw  
   } VOD-< "|  
   for(int index=0;index<MAX_KEY;index++){ xI{fd1  
    if(hCallWnd[index]==NULL) {!D(3~MI  
     continue; ~<!j]@.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M>Q ZN  
    { s8&q8r7%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !*Is0``  
     bProcessed=TRUE; =V|jd'iwx  
    } qdI%v#'M  
   } )Xg5=zn$  
  } Mq<ob+  
  else if((lParam&0xc000ffff)==1){ //Key down |hxiARr4  
   switch(wParam) *V hEl7  
   { ]?+i6 [6U  
    case VK_MENU: lND2Kb  
     MaskBits|=ALTBIT; qr4 lr!#t  
     break; vY_[@y  
    case VK_CONTROL: :=y5713  
     MaskBits|=CTRLBIT; ~D3 S01ecM  
     break; 0&s a#g2  
    case VK_SHIFT: %\ i&g$  
     MaskBits|=SHIFTBIT; H;4QuB'^  
     break; I3.. Yk%7  
    default: //judge the key and send message avq$aq(3&  
     break; _M/N_Fm  
   } -B#1+rUW  
   for(int index=0;index<MAX_KEY;index++) 1l$ C3c  
   { iOg4(SPci  
    if(hCallWnd[index]==NULL) U4=l`{5on  
     continue; GGEM&0*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5h/,*p6Nje  
    { 0\:= KIY.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2pdeJ  
     bProcessed=TRUE; {EvT7W  
    } +Mq\3  
   } 9oJM?&i  
  } <b H *f w  
  if(!bProcessed){ nC p/.]Y*  
   for(int index=0;index<MAX_KEY;index++){ k!x|oC0  
    if(hCallWnd[index]==NULL) 3h:~NL  
     continue; n5kGHL2   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \ji\r]k  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r{v3 XD/  
   } Fge%6hu  
  } 4& cQW)  
 } ) n O ^Ay  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }R<t=):  
} t9U6\ru  
5NZuaN  
BOOL InitHotkey() Jm<NDE~rw  
{ qm!cv;}c1  
 if(hHook!=NULL){ aI&~aezmN  
  nHookCount++; `hO%(9V9  
  return TRUE; 56z>/`=  
 } yF(9=z"?  
 else A#cFO)"  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); i'li;xUhZ  
  if(hHook!=NULL) cxs@ph&Wk  
   nHookCount++; $B-/>Rz  
  return (hHook!=NULL); %TQ4 ZFD3  
} B{&W|z{$  
BOOL UnInit() L@GICW~  
{ LHA^uuBN}  
 if(nHookCount>1){ ij0I!ilG4  
  nHookCount--; g@^y$wt  
  return TRUE; U!q2bF<@  
 } yS~Y"#F!.  
 BOOL unhooked = UnhookWindowsHookEx(hHook); UUDUd a  
 if(unhooked==TRUE){ +@?Q"B5u}  
  nHookCount=0; \JM6zR^Ef  
  hHook=NULL; m8F$h-  
 } [T_[QU:A  
 return unhooked; aeUgr !  
} 6d]4 %QT  
HSNj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;S U<T^a  
{ ^slIR!L  
 BOOL bAdded=FALSE; LSc^3=X  
 for(int index=0;index<MAX_KEY;index++){ 8_!qoW@B  
  if(hCallWnd[index]==0){ Y^Buz<OiG  
   hCallWnd[index]=hWnd; &*OwoTgk+  
   HotKey[index]=cKey; :ir#7/  
   HotKeyMask[index]=cMask; %U{sn\V  
   bAdded=TRUE; P_3IFHe  
   KeyCount++; $a~  
   break; N9M}H#  
  } TNqL ')f  
 } 4j3_OUwWZx  
 return bAdded; ivgX o'=  
} ;xiN<f4B  
)8oyo~4?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |iUF3s|?  
{ 9ia&/BT7"z  
 BOOL bRemoved=FALSE; J.XkdGQ  
 for(int index=0;index<MAX_KEY;index++){ ks. p)F>]  
  if(hCallWnd[index]==hWnd){ _m?i$5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &6CDIxH{  
    hCallWnd[index]=NULL; V]--d33/a  
    HotKey[index]=0; \2 DED  
    HotKeyMask[index]=0; Ne+Rs+~4  
    bRemoved=TRUE; #d %v=.1  
    KeyCount--; OE(y$+L3_I  
    break; ?VotIruR  
   } /E<Q_/'Z  
  } 9e`};DE   
 } ,]0BmlD  
 return bRemoved; <fHHrmZ#/.  
} T%%EWa<a  
 P s>Y]  
void VerifyWindow() RjVU m+<  
{ [xM&Jdf8  
 for(int i=0;i<MAX_KEY;i++){ ,M`1 k  
  if(hCallWnd!=NULL){ #9(+)~irz`  
   if(!IsWindow(hCallWnd)){ {D8opepO)  
    hCallWnd=NULL; |Jx:#OM  
    HotKey=0; ltNI+G  
    HotKeyMask=0; v+x<X5u  
    KeyCount--; z{3`nd,  
   } h$`m0-'  
  } I@m(}  
 } Wy-_}wqHg  
} GCYXDovh  
vGsAM* vw6  
BOOL CHookApp::InitInstance() % m6qL  
{ y$fMMAN7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); W3/] 2"0  
 hins=AfxGetInstanceHandle(); C"n!mr{srt  
 InitHotkey(); 6k@F?qHS  
 return CWinApp::InitInstance(); bJPKe]spJ=  
} wq.'8Y~BE  
kO`!!M[Oo  
int CHookApp::ExitInstance() x_O:IK.>  
{ On O_7'4 t  
 VerifyWindow(); >.UEs 8QV  
 UnInit(); DW,ERQ^  
 return CWinApp::ExitInstance(); =k d-rIBc  
} pFd{Tdh  
91R7Rrne  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0 J"g"=  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) u `ww  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ l$!ExXEZO;  
#if _MSC_VER > 1000 E2}X[EoBF  
#pragma once KJ/Gv#Kj  
#endif // _MSC_VER > 1000 &jEw(P&_  
/NB|N*}O)  
class CCaptureDlg : public CDialog KU "+i8"  
{ OD[=fR|cp  
 // Construction U&(gNuR>J  
 public: :s+?"'DP  
  BOOL bTray; k {{eyC  
  BOOL bRegistered; ._p2"<  
  BOOL RegisterHotkey(); ? Lxc1  
  UCHAR cKey; Z~(X[Zl :  
  UCHAR cMask; VG7#C@>Z  
  void DeleteIcon(); vt"bB  
  void AddIcon(); bO$KV"*!  
  UINT nCount; r-S%gG}~E  
  void SaveBmp(); v" #8^q  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Edc3YSg%;  
  // Dialog Data 7?g({]  
  //{{AFX_DATA(CCaptureDlg) )/!HI0TU  
  enum { IDD = IDD_CAPTURE_DIALOG }; hyPS 6Y'1  
  CComboBox m_Key; ^3vI NF  
  BOOL m_bControl;  ,e 7 ~G  
  BOOL m_bAlt; }t(5n$go6  
  BOOL m_bShift; jp_)NC/~g  
  CString m_Path; Cs"ivET  
  CString m_Number; .(p_YjIA  
  //}}AFX_DATA 1:7 fV@jw  
  // ClassWizard generated virtual function overrides lhE]KdE3  
  //{{AFX_VIRTUAL(CCaptureDlg) "}0QxogYE  
 public: l(QntP  
  virtual BOOL PreTranslateMessage(MSG* pMsg); G?~Yw'R^8  
 protected: #Q_Scxf  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !j  #8zN  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); u*\QVOF  
  //}}AFX_VIRTUAL c<q33dZ!*  
  // Implementation |R91|-H  
 protected: !}mM"|<  
  HICON m_hIcon; :Id8N~g  
  // Generated message map functions [KGj70|~  
  //{{AFX_MSG(CCaptureDlg) \{*`-P v  
  virtual BOOL OnInitDialog(); g|^U?|;p  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); TRgj`FG  
  afx_msg void OnPaint(); '%|Um3);0p  
  afx_msg HCURSOR OnQueryDragIcon(); ulg=,+%r  
  virtual void OnCancel(); yN[i6oe  
  afx_msg void OnAbout(); S h5m+>7K  
  afx_msg void OnBrowse(); VtN@B*  
  afx_msg void OnChange(); eGKvzu  
 //}}AFX_MSG 7/]Ra  
 DECLARE_MESSAGE_MAP() }`0=\cKqn  
}; 6L~5qbQ  
#endif  S{XO3  
|'}r-}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file V@G|2ZI  
#include "stdafx.h" Ug#B( }/  
#include "Capture.h" 6R3/"&P(/#  
#include "CaptureDlg.h" Y*jkUQ  
#include <windowsx.h> C@XnV=J  
#pragma comment(lib,"hook.lib") F6DVq8f9  
#ifdef _DEBUG /55 3v;l<  
#define new DEBUG_NEW {P?p*2J'  
#undef THIS_FILE 6ypHH 2X  
static char THIS_FILE[] = __FILE__; tG"EbWi  
#endif Y2uy@j*N  
#define IDM_SHELL WM_USER+1 /viBJ`-O  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hE,-CIRg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^8ilUu  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; E_D@ 7a  
class CAboutDlg : public CDialog {^:i}4ZRl  
{ ~}D"8[ABj  
 public: ?*q-u9s9  
  CAboutDlg(); rV%;d[LB  
  // Dialog Data ki `ur%h  
  //{{AFX_DATA(CAboutDlg) !8 l &%  
  enum { IDD = IDD_ABOUTBOX }; r;waT@&C  
  //}}AFX_DATA {A MAQ  
  // ClassWizard generated virtual function overrides A$zC$9{0I  
  //{{AFX_VIRTUAL(CAboutDlg) ?56;<%0  
 protected: ZI :wJU:f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D_z&G)  
  //}}AFX_VIRTUAL |ns9ziTDI  
  // Implementation Lnh'y`q  
 protected: SrWmV@"y  
  //{{AFX_MSG(CAboutDlg) HZ{DlH;&  
  //}}AFX_MSG 5C-n"8&C&  
  DECLARE_MESSAGE_MAP() >Zm|R|{BE  
}; ]K5j(1EN  
68qCY  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,0,& L  
{ ?[5_/0L,=  
 //{{AFX_DATA_INIT(CAboutDlg) sU^K5oo  
 //}}AFX_DATA_INIT `9f7H  
} M}" KAa  
)Y1+F,C  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,I f9w$(z  
{ W\ARCcTQ  
 CDialog::DoDataExchange(pDX); ))6iVgSE$  
 //{{AFX_DATA_MAP(CAboutDlg) l2!ztK1^  
 //}}AFX_DATA_MAP m0Uk*~Gz  
} ]>(pQD  
kI*f}3)Y  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SV1;[  
 //{{AFX_MSG_MAP(CAboutDlg) LwI4 2  
 // No message handlers I'R|B\  
 //}}AFX_MSG_MAP )4 w 3$Q  
END_MESSAGE_MAP() 90Z4saSUw  
y8di-d3_  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;ejtP #$  
: CDialog(CCaptureDlg::IDD, pParent) OBM&N  
{ cbx( L8  
 //{{AFX_DATA_INIT(CCaptureDlg) 1[?xf4EMG  
  m_bControl = FALSE; 0)|;uW  
  m_bAlt = FALSE; =\jPnov!  
  m_bShift = FALSE; pN;Tt+}  
  m_Path = _T("c:\\"); 6bpO#&T  
  m_Number = _T("0 picture captured."); VpM(}QHd  
  nCount=0; 7I@@}A  
  bRegistered=FALSE; g.Kyfs4`  
  bTray=FALSE; !xC IvKW  
 //}}AFX_DATA_INIT c=:A/z{  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 PtKrks|y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d6e]aO=g  
} LaIH3!M3  
GmN~e*x>p  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) m&6I@S2  
{ BMbZ34^e  
 CDialog::DoDataExchange(pDX); 2C &l\16  
 //{{AFX_DATA_MAP(CCaptureDlg) o2riy'~  
  DDX_Control(pDX, IDC_KEY, m_Key); 3q(]Dg;v  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); z 2Ao6*%  
  DDX_Check(pDX, IDC_ALT, m_bAlt); /5 R?(-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -hO[^^i9  
  DDX_Text(pDX, IDC_PATH, m_Path); ='.G,aJ9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 0yKPYA*j  
 //}}AFX_DATA_MAP vo'{phtF)M  
} ")GrQv a  
u*!/J R  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) p( [FZ  
//{{AFX_MSG_MAP(CCaptureDlg) LsV?b*^(p  
 ON_WM_SYSCOMMAND() R%%h=]  
 ON_WM_PAINT() n0@\x=9  
 ON_WM_QUERYDRAGICON() bdyE9t   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) HNL;s5gq  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) P/~kX_  
 ON_BN_CLICKED(ID_CHANGE, OnChange) v0~*?m4  
//}}AFX_MSG_MAP @{^6_n+gT%  
END_MESSAGE_MAP() rt!Uix&  
?pp|~A)b  
BOOL CCaptureDlg::OnInitDialog() 'sAs#  
{ [yfi:|n1  
 CDialog::OnInitDialog(); .:+&2#b  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $x1PU67  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7{DSLKtN  
 CMenu* pSysMenu = GetSystemMenu(FALSE); (Z};(Hn  
 if (pSysMenu != NULL) %y2 i1^  
 { { BDUl3T  
  CString strAboutMenu; ef(OhIX  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?Kf?Z`9 *Y  
  if (!strAboutMenu.IsEmpty()) "0A !fRI~  
  { JlN<w  
   pSysMenu->AppendMenu(MF_SEPARATOR); ' +[fJ>Le  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); J@ pCF@'  
  } 3%SwCYd  
 } T,Zfz9{n  
 SetIcon(m_hIcon, TRUE); // Set big icon oSqkAAGz\  
 SetIcon(m_hIcon, FALSE); // Set small icon 79Si^n1\  
 m_Key.SetCurSel(0); K9N\E"6ZP  
 RegisterHotkey(); XnI)s^  
 CMenu* pMenu=GetSystemMenu(FALSE); .R>4'#8q  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); J |TA12s  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); SXfAw)-n  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ){{]3r  
 return TRUE; // return TRUE unless you set the focus to a control Snf1vH  
} sa>}wz<o  
ZA/:\6gm  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) C@[f Z  
{ :%vD hMHa  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) $X:r&7t+Q[  
 { /tGj`C&qtw  
  CAboutDlg dlgAbout; ZQPv@6+oY  
  dlgAbout.DoModal(); X` FFI6pb  
 } v %fRq!~  
 else Qk.:b  
 { dKwY\)\  
  CDialog::OnSysCommand(nID, lParam); H- aSLc  
 } WAt| J2  
} /5c;,.hm1R  
Y^W.gGM  
void CCaptureDlg::OnPaint() $s-HG[lX[  
{ \+B+M 7  
 if (IsIconic()) G_UxR9Qo  
 { %4rPkPAtrp  
  CPaintDC dc(this); // device context for painting 8 m T..23  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); O*7Gl G  
  // Center icon in client rectangle SecZ5(+=  
  int cxIcon = GetSystemMetrics(SM_CXICON); w;p!~o &  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4-:TQp(  
  CRect rect; K6Gri>Um  
  GetClientRect(&rect); \f7A j>  
  int x = (rect.Width() - cxIcon + 1) / 2; gM<*(=x'  
  int y = (rect.Height() - cyIcon + 1) / 2; N6BFs(  
  // Draw the icon | D jgm7$*  
  dc.DrawIcon(x, y, m_hIcon); |P"p/iY  
 } z"C+r'39d=  
 else S4?N_"m9  
 { ywRw i~  
  CDialog::OnPaint(); .(8sa8{N  
 } V:w=h>z8  
} Iv5 agh%  
hh!^^emo  
HCURSOR CCaptureDlg::OnQueryDragIcon() .w`1;o  
{ naT;K0T=  
 return (HCURSOR) m_hIcon; . !|3a  
} ,\BGxGNAmV  
XfXqq[\N  
void CCaptureDlg::OnCancel() pU|SUM  
{ l}$Pv?T,2  
 if(bTray) >dW~o_u'QN  
  DeleteIcon(); i$A0_ZJKjZ  
  CDialog::OnCancel(); 0V&6"pF_Y'  
} ]`2=<n;=  
\*V`w@  
void CCaptureDlg::OnAbout() Z+< zKn}  
{ T*%Q s&x ;  
 CAboutDlg dlg; PfI~`ke  
 dlg.DoModal(); 6_# >s1`R  
} t(|\3$z  
tC=`J%Ik  
void CCaptureDlg::OnBrowse() D:gskK+o6M  
{ , LP |M:  
 CString str; *$ihNX]YG  
 BROWSEINFO bi; P%6-W5<  
 char name[MAX_PATH]; + W ? / A]  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); fr1/9E;  
 bi.hwndOwner=GetSafeHwnd(); OI9V'W$  
 bi.pszDisplayName=name; _[,oP s:+  
 bi.lpszTitle="Select folder"; 'Zdjd]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; xi]qdiA  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 'ju{j`b  
 if(idl==NULL) 0!c^pOq6  
  return; qe!\ oh  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :Qg3B ';  
 str.ReleaseBuffer(); 52$7vYMto  
 m_Path=str; "]dNN{Wka  
 if(str.GetAt(str.GetLength()-1)!='\\') eJB !|  
  m_Path+="\\"; tnbtfG;z#  
 UpdateData(FALSE); z#8d\X/  
}  ;Q;u^T`  
Q-X<zn  
void CCaptureDlg::SaveBmp() `2X#;{a:  
{  lqO"  
 CDC dc; {o?+T );Z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); L+}q !'8S  
 CBitmap bm; ptS1d$  
 int Width=GetSystemMetrics(SM_CXSCREEN); .cTK\  
 int Height=GetSystemMetrics(SM_CYSCREEN); R(c:#KF#8  
 bm.CreateCompatibleBitmap(&dc,Width,Height); d85\GEF9i  
 CDC tdc; 9}{i8 <$=  
 tdc.CreateCompatibleDC(&dc); h]rF2 B  
 CBitmap*pOld=tdc.SelectObject(&bm); Mb6 #97  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); LCrE1Q%VP  
 tdc.SelectObject(pOld); HeagT(rN'  
 BITMAP btm; 2l)J,z  
 bm.GetBitmap(&btm); A Z7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Nj2f?',;U  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); o5(p&:1M  
 BITMAPINFOHEADER bih; 8:%=@p>$  
 bih.biBitCount=btm.bmBitsPixel; O'~c;vBI  
 bih.biClrImportant=0; J Cu3,O!q  
 bih.biClrUsed=0; zW`$T 88~  
 bih.biCompression=0; nwk66o:|  
 bih.biHeight=btm.bmHeight; >9o(84AxIH  
 bih.biPlanes=1; /qW5M4.w  
 bih.biSize=sizeof(BITMAPINFOHEADER); 17Q1Xa  
 bih.biSizeImage=size; }U=|{@%  
 bih.biWidth=btm.bmWidth;  q$$:<*Uy  
 bih.biXPelsPerMeter=0; e>-a\g  
 bih.biYPelsPerMeter=0; fX,L;Se"  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6B)3SC  
 static int filecount=0; !$"DD[~\  
 CString name; `.f {V  
 name.Format("pict%04d.bmp",filecount++); | fMjg'%{}  
 name=m_Path+name; c5K@<=?,E  
 BITMAPFILEHEADER bfh; AnV\{A^  
 bfh.bfReserved1=bfh.bfReserved2=0; h 7feZ_  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ]&za^%q0&  
 bfh.bfSize=54+size; a D*  
 bfh.bfOffBits=54; nR7 usL  
 CFile bf; 78v4c Q Y  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ LFsrqdzJ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); U!E   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); SMr ]Gf.  
  bf.WriteHuge(lpData,size); i2ap]  
  bf.Close(); 3"O)"/"Q.  
  nCount++; CKShz]1  
 } |sN>/89=/  
 GlobalFreePtr(lpData); [E_eaez7#  
 if(nCount==1) ~+1t3M e  
  m_Number.Format("%d picture captured.",nCount); m>C}T  
 else &UhI1mi]h  
  m_Number.Format("%d pictures captured.",nCount); Yx21~:9}  
  UpdateData(FALSE); :"+/M{qz  
} %RE-_~GF  
wD}ojA&DU  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \Kph?l9Ww  
{ BlF]-dF\  
 if(pMsg -> message == WM_KEYDOWN) cqzd9L6=  
 { RbUhLcG5  
  if(pMsg -> wParam == VK_ESCAPE) 2s{PE  
   return TRUE; _jV(Gv'  
  if(pMsg -> wParam == VK_RETURN) N;cEf7+f  
   return TRUE; MHN?ZHC)  
 } 8r^~`rL  
 return CDialog::PreTranslateMessage(pMsg); ;[*jLi,uc  
} @1#QbNp#  
jseyT#2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ! 6kLL  
{  y{h y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +{V"a<D$m  
  SaveBmp(); V`OeJVe  
  return FALSE; ]I9Hbw  
} ~]HeoQK  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 6iwIEb  
 CMenu pop; hLyD#XCFA  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6Q<^,`/T  
 CMenu*pMenu=pop.GetSubMenu(0); [AzQP!gi  
 pMenu->SetDefaultItem(ID_EXITICON); i{8T 8  
 CPoint pt; r<]Db&k   
 GetCursorPos(&pt); 4q"x|}a  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^h+,Kn0@  
 if(id==ID_EXITICON) Yqs N#E3pf  
  DeleteIcon(); G[4TT#  
 else if(id==ID_EXIT) S Rs~p  
  OnCancel(); X {,OP/  
 return FALSE; PI>PEge!&  
} ?CB*MWjd  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); mzuf l:-=  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *')g}2iB  
 AddIcon(); ,?Pn-aC +  
 return res; d,}fp)  
} q\Cg2[nn2  
a []Iz8*6e  
void CCaptureDlg::AddIcon() v)|[=  
{ & 2MI(9v  
 NOTIFYICONDATA data; csg:# -gE  
 data.cbSize=sizeof(NOTIFYICONDATA); K31G>k@  
 CString tip; FLI\SF<  
 tip.LoadString(IDS_ICONTIP); L,*KgLG  
 data.hIcon=GetIcon(0); %liu[6_  
 data.hWnd=GetSafeHwnd(); +Hz});ix<  
 strcpy(data.szTip,tip); Mq-QWx"P  
 data.uCallbackMessage=IDM_SHELL; 8d9&LPv  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <rUH\z5cP  
 data.uID=98; QUL^]6$  
 Shell_NotifyIcon(NIM_ADD,&data); @OOnO+g  
 ShowWindow(SW_HIDE); 7n*,L5%?]4  
 bTray=TRUE; 9-;ujl?{  
} R<VNbm;  
-.A%c(|Q  
void CCaptureDlg::DeleteIcon() P(I`^x  
{ 'P{0K?{H-4  
 NOTIFYICONDATA data; Fw!wSzsk3  
 data.cbSize=sizeof(NOTIFYICONDATA); Qmxe*@{`  
 data.hWnd=GetSafeHwnd(); 70,V>=aJ  
 data.uID=98; Dm=t`_DL8  
 Shell_NotifyIcon(NIM_DELETE,&data); ea3;1-b:  
 ShowWindow(SW_SHOW);  Ad)Po  
 SetForegroundWindow(); 9] /xAsD  
 ShowWindow(SW_SHOWNORMAL); h^klP:Q  
 bTray=FALSE; _{CMWo"l  
} |cpBoU  
qd*3| O^  
void CCaptureDlg::OnChange() cjzhuH/y  
{ zx"'WM*  
 RegisterHotkey(); O$jj&  
} /C(lQs*l  
.'o<.\R8  
BOOL CCaptureDlg::RegisterHotkey() &V5[Zj|]  
{ f}q4~NPn-  
 UpdateData(); ,]?Xf >  
 UCHAR mask=0; H.EgL@;mb  
 UCHAR key=0; &6fNPD(|  
 if(m_bControl) _EeH  
  mask|=4; \u@4 eBAV  
 if(m_bAlt) [(v?Z`cX\  
  mask|=2; pEk^;  
 if(m_bShift) Le3H!9lbc  
  mask|=1; }:u" ?v=|j  
  key=Key_Table[m_Key.GetCurSel()]; L3:dANG  
 if(bRegistered){ b_= $W  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Xd%c00"U  
  bRegistered=FALSE; !mNXPqnN  
 } m&/{iCwp  
 cMask=mask; VU+`yQp  
 cKey=key; IXb]\ )  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); } ).rD  
 return bRegistered; mG4myQ?$  
} XMb]&VvH  
n< UuVu  
  四、小结 5wM*(H^c[  
6^U8Utx  
  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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