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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: 9ao GptgN  
  (3VV(18  
  一、实现方法 =O o4O CF2  
7[I%UP  
  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: '$0~PH&  
w D}g\{P  
#pragma data_seg("shareddata") 8! X K[zL  
HHOOK hHook =NULL; //钩子句柄 5jey%)=  
UINT nHookCount =0; //挂接的程序数目 0!tw)HR%  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ~Gj%z+<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 !;, Dlq-}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey "6t#   
static int KeyCount =0; pNNvg,hS8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ))xP]Muv  
#pragma data_seg() Dt~ |)L+  
/%{Qf  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 s&)>gE\  
i_{b *o_an  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: %0Mvd;#[  
pd\x^F`sk.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |*5HNP  
cKey,UCHAR cMask) efrVF5,y?  
{ L ]Y6/Q   
 BOOL bAdded=FALSE; Z=.$mFE\  
 for(int index=0;index<MAX_KEY;index++){ o,gH*  
  if(hCallWnd[index]==0){ 8`B]UcL)  
   hCallWnd[index]=hWnd; *Sw1b7l  
   HotKey[index]=cKey; B,(zp#&yB  
   HotKeyMask[index]=cMask; S{ fFpe-  
   bAdded=TRUE; \r`><d  
   KeyCount++; ;7*R;/  
   break; G?dxLRy.do  
  } #`o]{UfW  
 } I3hN7  
 return bAdded; = P@j*ix  
} |y$8!*S~(  
//删除热键 yKB&][)&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lO/?e!$  
{ ]t)#,'$^[W  
 BOOL bRemoved=FALSE; ,SG-{   
 for(int index=0;index<MAX_KEY;index++){ \'hZm%S  
  if(hCallWnd[index]==hWnd){ ~\khwNA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O.z\ VI2f  
    hCallWnd[index]=NULL; U'p-Ko#  
    HotKey[index]=0; $mu*iW\{  
    HotKeyMask[index]=0; UlQS]f~  
    bRemoved=TRUE; tDQuimYu7  
    KeyCount--; ,)35Vi;.  
    break; ?Rd{`5.D  
   } FNR<=M  
  } hF^y4v|5  
 } 13aj fH  
 return bRemoved; yFY:D2  
} l|j}Ggen  
yp?a7t M  
EWC{896,  
  DLL中的钩子函数如下: uA;vW\fHr  
DkJ "#8Yl=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) B&rw R/d  
{ YT~h1<se  
 BOOL bProcessed=FALSE; $!v:@vNMs  
 if(HC_ACTION==nCode) \(`8ng]vs  
 { L+D9ZE]  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3L^]J}|  
   switch(wParam) "?v{?,@  
   {  _?oofE:{  
    case VK_MENU: 8;v/b3  
     MaskBits&=~ALTBIT; Wy.^1M/n>~  
     break; #p7K2  
    case VK_CONTROL: ]$&N"&q  
     MaskBits&=~CTRLBIT; n^iq?u  
     break; y Q-{ CJ,  
    case VK_SHIFT: u:w   
     MaskBits&=~SHIFTBIT; Ohn?>qQ  
     break; {$QkerW3  
    default: //judge the key and send message ~-f"&@){,  
     break; >K n7A  
   } &>A<{J@VL  
   for(int index=0;index<MAX_KEY;index++){ 1n!xsesSc  
    if(hCallWnd[index]==NULL) 4A)@,t9+  
     continue; h,zM*zA_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l4$Iv:  
    { 9Q>85IiT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -]Y@_T.C  
     bProcessed=TRUE; 3eERY[  
    } pD17r}%  
   } XiO~^=J  
  } +SNjU"x  
  else if((lParam&0xc000ffff)==1){ //有键按下 W 9!K~g_  
   switch(wParam) { RC&Ub>  
   { VRB!u420  
    case VK_MENU: K_ Odu^  
     MaskBits|=ALTBIT; g[Q+DT  
     break; e!=~f%c<N  
    case VK_CONTROL: <j}A=SDZ)  
     MaskBits|=CTRLBIT; Seh(G  
     break; ]Ns)fr 6  
    case VK_SHIFT: > JV$EY,  
     MaskBits|=SHIFTBIT; YL&)@h  
     break;  P0 9f  
    default: //judge the key and send message 2rxz<ck(  
     break;  &4{!5r  
   } Q 6n!u;  
   for(int index=0;index<MAX_KEY;index++){ \:4SN&I~  
    if(hCallWnd[index]==NULL) D{rM  
     continue; } 89-U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bm poptfL  
    { +Z e;BKZ3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); mtmTlGp6Lc  
     bProcessed=TRUE; M(?0c}z  
    } 4'5|YGQj  
   } $.x,[R aN  
  } B  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 w:+&i|H>  
   for(int index=0;index<MAX_KEY;index++){ d_ 7hh  
    if(hCallWnd[index]==NULL) IictX"3lh  
     continue; ,c,@WQ2:-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) PiN^/#D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); u N4e n,  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 m "96%sB  
   } Rga *68s|&  
  } .: k6Kg  
 } ;EQ7kuJQ?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); x c]#8K  
} <Hr~|oG  
G!+Mu2  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: a"&cm'\lL  
+c$:#9$ |  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _FxeZ4\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @{"?fqo  
MK(~  
  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: s:3b.*t<  
!Ahxi);a  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) AsI\#wL)  
{ 8Si3 aq3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 2ck0k,WP  
 { Ab6R ?mUM  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 (H8JV1J  
  SaveBmp(); i1S cXKO  
  return FALSE; [1nUq!uTm  
 } Mc&Fj1h5  
 …… //其它处理及默认处理 J7Mbv2D  
} IN75zn*%  
Zs4NN 2~  
?a-5^{{  
  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。 k [LV^oEg  
Iz[ohn!f  
  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。 6{quO# !  
~dk97Z8  
  二、编程步骤 qw 03]a  
~F8xXW0  
  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"; pxn@rN#*  
Y,Lx6kU  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5>lIrBf  
&->ngzg  
  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; #{?~XS  
fejC ,H4I  
  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; 9Dbbk/j|  
}3_ >  
  5、 添加代码,编译运行程序。 _+X-D9j(l  
_u]%K-_  
三、程序代码 CeeAw_*@  
mV^~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL b:cy(6G(  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) BOWOH  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %/ctt_p0x  
#if _MSC_VER > 1000 *`8JJs0g  
#pragma once loC~wm%Ql  
#endif // _MSC_VER > 1000 D^gS.X^  
#ifndef __AFXWIN_H__ [X91nUz#  
#error include 'stdafx.h' before including this file for PCH wh)F&@6 R!  
#endif Nv^b yWqu  
#include "resource.h" // main symbols S9{A}+"K  
class CHookApp : public CWinApp jtUqrJFlQ  
{ &isKU 8n  
 public: {PR "}x  
  CHookApp(); rzs-c ?  
  // Overrides )xiu \rC  
  // ClassWizard generated virtual function overrides }V[ORGzox  
  //{{AFX_VIRTUAL(CHookApp) l6 L?jiTl_  
 public: PQp =bX,  
  virtual BOOL InitInstance(); G:3szz  
  virtual int ExitInstance(); p{}4#+-<#H  
  //}}AFX_VIRTUAL A$]s{`  
  //{{AFX_MSG(CHookApp) Q'qX`K+@`  
  // NOTE - the ClassWizard will add and remove member functions here. AVm+ 1  
  // DO NOT EDIT what you see in these blocks of generated code ! YN+vk}8 <  
  //}}AFX_MSG a{@}vZx>3  
  DECLARE_MESSAGE_MAP() |B^Mj57DO  
}; JHXkQz[Jb  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); L ^r & .N\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;s;3cC!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xW]65iav  
BOOL InitHotkey(); xK_oV+  
BOOL UnInit(); ^,#m y<{  
#endif !JyY&D~`  
]jYFrOMy4S  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. SZEi+CRs0  
#include "stdafx.h" tJybR"NQ  
#include "hook.h" tbWf m5$  
#include <windowsx.h> {VKFw=$8  
#ifdef _DEBUG ]Axz}:  
#define new DEBUG_NEW EY:IwDA.}  
#undef THIS_FILE *AYq :n6  
static char THIS_FILE[] = __FILE__; ""Da 2Md  
#endif '_^T]fr}  
#define MAX_KEY 100 z:@:B:E  
#define CTRLBIT 0x04 {}$Zff   
#define ALTBIT 0x02 0|J_'-<  
#define SHIFTBIT 0x01 7}g4ePYag  
#pragma data_seg("shareddata") |Fi5/$S.  
HHOOK hHook =NULL; 1`YU9?  
UINT nHookCount =0; 5 mC"8N1)  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey DzQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT l#`G4Vf  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #f YB4.i~  
static int KeyCount =0; tc<uS%XT4^  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 6pSi-FH  
#pragma data_seg() N0.|Mb"?t  
HINSTANCE hins; 4l+!Z,b  
void VerifyWindow(); R(`:~@ 3\6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !?(7g2NP)  
//{{AFX_MSG_MAP(CHookApp) tAF?. \x"g  
// NOTE - the ClassWizard will add and remove mapping macros here. #{PwEX !Ct  
// DO NOT EDIT what you see in these blocks of generated code! ,zltNbu\.(  
//}}AFX_MSG_MAP ! 5NuFLOf  
END_MESSAGE_MAP() 8AX_y3$  
:n QlS  
CHookApp::CHookApp() IO:*F0  
{ h%krA<G9  
 // TODO: add construction code here, w4vV#C4X  
 // Place all significant initialization in InitInstance Rd&DH_<+^  
} '*`#xNu[  
@p L9a1PJv  
CHookApp theApp; ;4[[T%&v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }!AS?  
{ 5,pNqXRp  
 BOOL bProcessed=FALSE; l6y}>]  
 if(HC_ACTION==nCode) W3:Fw6v  
 { nuXL{tg6  
  if((lParam&0xc0000000)==0xc0000000){// Key up 0] kKF<s  
   switch(wParam) sl `jovT[Y  
   { p,goYF??  
    case VK_MENU: > .  
     MaskBits&=~ALTBIT; 8 {V9)U  
     break; w y|^=#k  
    case VK_CONTROL: V`1,s~"q  
     MaskBits&=~CTRLBIT; 8HQ.MXKP  
     break; TK fN`6  
    case VK_SHIFT: ) ](ls@*  
     MaskBits&=~SHIFTBIT; I5_HaC>  
     break; /\c'kMAW!  
    default: //judge the key and send message O=A2QykV(  
     break; <;6{R#Tuh  
   } @M]_],  
   for(int index=0;index<MAX_KEY;index++){ "FWx;65CR  
    if(hCallWnd[index]==NULL) Y @p<f5[c  
     continue; p 1'l D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,^1zG  
    { mK[Z#obc=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;^5k_\  
     bProcessed=TRUE; motK}G  
    }  ch8a  
   } @"-\e|[N  
  } s*ZE`/SM3  
  else if((lParam&0xc000ffff)==1){ //Key down } #rTUX  
   switch(wParam) Q$c6l[(g  
   { )1uiY f&k  
    case VK_MENU: e@Lxduq  
     MaskBits|=ALTBIT; FfdB%  
     break; 6 Rl[M+Q  
    case VK_CONTROL: [OW <<6  
     MaskBits|=CTRLBIT; Do/R.Mgy*  
     break; YV<y-,Io  
    case VK_SHIFT: |oi+|r  
     MaskBits|=SHIFTBIT; #wI}93E  
     break; d+ jX49Vt  
    default: //judge the key and send message _x!id f  
     break; a%T`c/C  
   } #;]#NqFX  
   for(int index=0;index<MAX_KEY;index++) STp9Gh-  
   { RpQeQM=  
    if(hCallWnd[index]==NULL) vR!+ 8sy$  
     continue; JaCX}[R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m&:&z7^p  
    { zj1~[$  (  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {> YsrD C  
     bProcessed=TRUE; Io1j%T#ZT  
    } 7nek,8b  
   } HIXAA?_eh=  
  } JWix Y/  
  if(!bProcessed){ ^#Ha H  
   for(int index=0;index<MAX_KEY;index++){ 7k( }U_v  
    if(hCallWnd[index]==NULL) !6KX^j-  
     continue; Y%XF64)6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %S`& R5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~U0%}Bbh  
   } <RY =y?%z  
  } ; oyV8P$  
 } eDJnzh83  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); X 0G,tl  
} "mK`3</G  
N1a]y/  
BOOL InitHotkey() gV2vwe  
{ 2:*15RH3  
 if(hHook!=NULL){ m,k 0 h%  
  nHookCount++; r5}p .  
  return TRUE; um.ZAS_kmc  
 } S&_03  
 else 'D+xs}\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); rH3U;K!  
  if(hHook!=NULL) P`biHs8O  
   nHookCount++; *;fTiL  
  return (hHook!=NULL); i#[8I-OtN/  
} g8<ODU0[g  
BOOL UnInit() h>/teHy /  
{ ?UtKu  
 if(nHookCount>1){ A2|Bbqd  
  nHookCount--; KD kGQh#9  
  return TRUE; V<QpC5  
 } ~}.C*;J  
 BOOL unhooked = UnhookWindowsHookEx(hHook); x?Abk  
 if(unhooked==TRUE){ y, l[v39  
  nHookCount=0; |_;kQ(,  
  hHook=NULL; >Xn,jMUW  
 } D+]mKPB  
 return unhooked; q+?&w'8  
} a*P v^Np-v  
-9b=-K.y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;_,jy7lf  
{ 7Qd4L.  
 BOOL bAdded=FALSE;  JW D`}  
 for(int index=0;index<MAX_KEY;index++){ y%TqH\RKv  
  if(hCallWnd[index]==0){ Kxsd@^E  
   hCallWnd[index]=hWnd; f 2WVg;Z  
   HotKey[index]=cKey; aTvyz r1  
   HotKeyMask[index]=cMask; oGcgd$%ZB  
   bAdded=TRUE; _Xf1FzF+a  
   KeyCount++; Y&6jFT_  
   break; 1)X|?ZD]F  
  } 7{#p'.nc5  
 } b~gq8,Fatb  
 return bAdded; ynsYU(  
} TGJz[Ny  
Wg|6{'a  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) REh"/d  
{ 8W&1"h`  
 BOOL bRemoved=FALSE; K *@?BE  
 for(int index=0;index<MAX_KEY;index++){ k79OMf<v  
  if(hCallWnd[index]==hWnd){ 3f`Uoh+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 56pj(}eq  
    hCallWnd[index]=NULL; G4|C227EO  
    HotKey[index]=0; {sw|bLo|+  
    HotKeyMask[index]=0; 0~nX7  
    bRemoved=TRUE; 6s@!Yn|?  
    KeyCount--; $bE" 3/uf  
    break; EXSH{P O+  
   } Ku[q #_7  
  } [G_ ;78  
 } 4e#g{,  
 return bRemoved;  ,$6si  
} #un'?]tZF  
LQF;T7VKS)  
void VerifyWindow() v[$e{Dz(  
{ -RP{viG WK  
 for(int i=0;i<MAX_KEY;i++){ W? G4>zA  
  if(hCallWnd!=NULL){ J_)F/S!T  
   if(!IsWindow(hCallWnd)){  !XTzsN  
    hCallWnd=NULL; #VhdYDbW  
    HotKey=0; 3~sV-  
    HotKeyMask=0; [Q T ;~5  
    KeyCount--; \n}%RD-Ce  
   } ,LBj$U]e|E  
  } 9O- otAGM  
 } z(A60b}  
} fHaF9o+/b  
(Nzh1ul\}  
BOOL CHookApp::InitInstance() dw6ysOR@  
{ zTue(Kr  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); nk!uO^  
 hins=AfxGetInstanceHandle(); 6PsT])*>DE  
 InitHotkey(); xhALJfv  
 return CWinApp::InitInstance(); Y$OE[nGi%X  
} M&iXdw&  
W%rUa&00  
int CHookApp::ExitInstance() O]I AIM  
{ R(}<W$(TV  
 VerifyWindow(); T$kuv`?  
 UnInit(); FO>?>tK 0  
 return CWinApp::ExitInstance(); UR^r>  
} Yv1yRoDv  
2z;nPup,  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file pauO_'j_1p  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zeGWM,!  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1 Ne;U/  
#if _MSC_VER > 1000 xjp0w7L)J  
#pragma once IfH/~EtX  
#endif // _MSC_VER > 1000 W2<'b05  
'z9 1aNG]  
class CCaptureDlg : public CDialog 5]G%MB/|$  
{ U2`:'  
 // Construction /K2[`+-  
 public: =o~mZ/ 7=M  
  BOOL bTray; %]F/!n  
  BOOL bRegistered; 6 (7 56  
  BOOL RegisterHotkey(); J[}j8x?r  
  UCHAR cKey; /\,3AInLb  
  UCHAR cMask; 7jw+o*;  
  void DeleteIcon(); uBG!R#T  
  void AddIcon(); ce$ [H}rDB  
  UINT nCount; *lDVV,T'}w  
  void SaveBmp(); eJf]"-  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor gR/?MJ(v  
  // Dialog Data rrC\4#H[??  
  //{{AFX_DATA(CCaptureDlg) ~;b}_?%o  
  enum { IDD = IDD_CAPTURE_DIALOG }; 9<&*iIrM  
  CComboBox m_Key; kh}h(z^  
  BOOL m_bControl; \Ec*Gq?.  
  BOOL m_bAlt; n:a~=^IV  
  BOOL m_bShift; MHp:".1  
  CString m_Path; Ho#nM_ q  
  CString m_Number; zjH8 S  
  //}}AFX_DATA D_( NLC  
  // ClassWizard generated virtual function overrides `)$G}7cRUH  
  //{{AFX_VIRTUAL(CCaptureDlg) 8i^ ./P  
 public: n+ H2cl }  
  virtual BOOL PreTranslateMessage(MSG* pMsg); n3? msY(*  
 protected: H{*rV>%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |J@ &lBlq  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); P\@kqf~pC  
  //}}AFX_VIRTUAL yd VDjE Y  
  // Implementation Kf?:dF  
 protected: ; P<h 9(  
  HICON m_hIcon; UOj*Gt&  
  // Generated message map functions j0LZ )V  
  //{{AFX_MSG(CCaptureDlg) jc3Q3Th/zn  
  virtual BOOL OnInitDialog(); k"=*'  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2asRJ97qES  
  afx_msg void OnPaint(); O:'qwJ# ~  
  afx_msg HCURSOR OnQueryDragIcon(); $J<WFDn9  
  virtual void OnCancel(); %$Fe[#1  
  afx_msg void OnAbout(); ES^J RX  
  afx_msg void OnBrowse(); !5'4FUlJ  
  afx_msg void OnChange(); ld"rL6  
 //}}AFX_MSG Ne;0fk O  
 DECLARE_MESSAGE_MAP() 8_wh9   
}; 1\{FKO t  
#endif d %FLk=]  
W9} ,f  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file r=37Q14v  
#include "stdafx.h" (:]+IjnE  
#include "Capture.h" %* K zP{  
#include "CaptureDlg.h" /:!l&1l:p  
#include <windowsx.h> : ^p aI  
#pragma comment(lib,"hook.lib") qHheF%[\5  
#ifdef _DEBUG 'cu14m_  
#define new DEBUG_NEW oP T)vN?  
#undef THIS_FILE +tt!xfy  
static char THIS_FILE[] = __FILE__; : &nF>  
#endif 48S NI  
#define IDM_SHELL WM_USER+1 yIr0D 6L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); # bjK]+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l['p^-I  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; M*cF'go  
class CAboutDlg : public CDialog FbMtor  
{ OVxg9  
 public: 0$b4\.0>~  
  CAboutDlg(); UlNiH  
  // Dialog Data |Y6;8e`H  
  //{{AFX_DATA(CAboutDlg) MtF^}/0w!`  
  enum { IDD = IDD_ABOUTBOX }; ' -9=>  
  //}}AFX_DATA O> _ F   
  // ClassWizard generated virtual function overrides unqUs08  
  //{{AFX_VIRTUAL(CAboutDlg) -ON-0L  
 protected: i`<L#6RBT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U8gj\G\`  
  //}}AFX_VIRTUAL 3mopTzs)  
  // Implementation R'vNJDFY  
 protected: 3(t3r::&  
  //{{AFX_MSG(CAboutDlg) J"S(GL  
  //}}AFX_MSG wKpb%3  
  DECLARE_MESSAGE_MAP() "1XTgCu\  
}; p(="73  
j[mII5e7g  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |c2sJyj*  
{ x)Zm5&"Gg  
 //{{AFX_DATA_INIT(CAboutDlg) p{v*/<.;  
 //}}AFX_DATA_INIT Zl'/Mx g  
} h-O;5.m-P  
_ iDVd2X"H  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R i,_x  
{ (GGosXU-v  
 CDialog::DoDataExchange(pDX); *_J{_7pwe  
 //{{AFX_DATA_MAP(CAboutDlg) _<F;&(o  
 //}}AFX_DATA_MAP N^wHO<IO 1  
} ;ThFB  
4Z=`;  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) N(yd<M w  
 //{{AFX_MSG_MAP(CAboutDlg) ,uNJz-B8  
 // No message handlers dIh+h|:  
 //}}AFX_MSG_MAP g]N'6La  
END_MESSAGE_MAP() tcRJ1:d  
a9 q:e  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) oclU)f.,  
: CDialog(CCaptureDlg::IDD, pParent) SO STtuT  
{ Ahba1\,N$  
 //{{AFX_DATA_INIT(CCaptureDlg) Bxw(pACf  
  m_bControl = FALSE; Y-st2r[,  
  m_bAlt = FALSE; 4{vEW(  
  m_bShift = FALSE; |N)),/R_  
  m_Path = _T("c:\\"); |*b-m k  
  m_Number = _T("0 picture captured."); Q@PDhISa  
  nCount=0; ]xoG{%vgb  
  bRegistered=FALSE; C4gES"T  
  bTray=FALSE; 34"PtWbV>  
 //}}AFX_DATA_INIT \X! NoF  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7TI6EKr  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Z1v~tqx  
} b$Dh|-8  
W#^.)V  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) KZcmNli&A  
{  h 7l>(3  
 CDialog::DoDataExchange(pDX); 7hu7rWY`E  
 //{{AFX_DATA_MAP(CCaptureDlg) b5Q>e%i#  
  DDX_Control(pDX, IDC_KEY, m_Key); /NiD#s0t  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -])=\n!=  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Fsx<Sa  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 75> Ok/  
  DDX_Text(pDX, IDC_PATH, m_Path); }a9G,@:k  
  DDX_Text(pDX, IDC_NUMBER, m_Number); rev*G:  
 //}}AFX_DATA_MAP >mR8@kob<  
} v[8+fd)}S  
T2.[iD!A  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ITn PF{N  
//{{AFX_MSG_MAP(CCaptureDlg) 3Z me?o*bY  
 ON_WM_SYSCOMMAND() ~LOE^6C+~o  
 ON_WM_PAINT() IFS_DW  
 ON_WM_QUERYDRAGICON() R?9x!@BV  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) dT?3Q;>B?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) z5~W >r  
 ON_BN_CLICKED(ID_CHANGE, OnChange) f.66N9BHL,  
//}}AFX_MSG_MAP :-Py0{s  
END_MESSAGE_MAP() N]| >\  
cL03V?} ~  
BOOL CCaptureDlg::OnInitDialog() rMZuiRz*  
{ B@6L<oZ  
 CDialog::OnInitDialog(); g*LD}`X/-  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8 Zp^/43  
 ASSERT(IDM_ABOUTBOX < 0xF000); b8YdONdy  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Kdp($L9r  
 if (pSysMenu != NULL) G-RDQ  
 { :lvBcFw  
  CString strAboutMenu; XG C\6?L~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); =8<~pr-NO  
  if (!strAboutMenu.IsEmpty()) kmt1vV.9  
  { f38e(Q];m  
   pSysMenu->AppendMenu(MF_SEPARATOR); 6'@{ * u  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); x{<l8vL=-c  
  } E!mv}  
 } 'x"(OdM:[  
 SetIcon(m_hIcon, TRUE); // Set big icon 2=0HQXXrq  
 SetIcon(m_hIcon, FALSE); // Set small icon 8=joVbs  
 m_Key.SetCurSel(0); udLIAV*  
 RegisterHotkey(); 6j6;lNUc  
 CMenu* pMenu=GetSystemMenu(FALSE); fxr#T'i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {N/%%O.b  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \#B<'J9.`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); yrfV&C%=n  
 return TRUE; // return TRUE unless you set the focus to a control r@Jy*2[-Jq  
} Yb/*2iWX  
9`Fw}yAt  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) s<k2vbhI  
{ vPz7*w  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) x(eX.>o\  
 { ^IIy>  
  CAboutDlg dlgAbout; r-.@MbBm  
  dlgAbout.DoModal(); h"0)spF"d  
 } u5glKE  
 else h ! R=t  
 { ArNQ}F/  
  CDialog::OnSysCommand(nID, lParam); "2sk1  
 } N8#j|yf  
} 51#OlvD  
 +)e|>  
void CCaptureDlg::OnPaint() y;8&J{dd  
{ N 1Ag .  
 if (IsIconic()) 6b'.WB]-  
 { >,]8iMh  
  CPaintDC dc(this); // device context for painting *tEqu%N1'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); p&]V!O  
  // Center icon in client rectangle 1hGj?L0m.  
  int cxIcon = GetSystemMetrics(SM_CXICON); X<[ qX*  
  int cyIcon = GetSystemMetrics(SM_CYICON); |3@DCb T  
  CRect rect; 9_O4 yTL  
  GetClientRect(&rect); 23>[-XZb[O  
  int x = (rect.Width() - cxIcon + 1) / 2; lNa+NtQu  
  int y = (rect.Height() - cyIcon + 1) / 2; d,JDfG)  
  // Draw the icon @&WHX#  
  dc.DrawIcon(x, y, m_hIcon); Jut&J]{h  
 } u YT$$'S  
 else  G7a l@  
 { JDE_*xaUV  
  CDialog::OnPaint(); VLkAsM5}%  
 } [{BY$"b#:  
} bD:0k.`  
 L1 /`/  
HCURSOR CCaptureDlg::OnQueryDragIcon() Cg]),S  
{ Im/tU6ybV  
 return (HCURSOR) m_hIcon; uu,F5<y[  
} ZqVbNIY   
'OziP  
void CCaptureDlg::OnCancel() d`B<\Y#{Us  
{ p T8?z  
 if(bTray) x}?<9(nE c  
  DeleteIcon(); lYQ|NL():  
  CDialog::OnCancel(); qclc--fsE  
} yivu|q  
%(lO>4>|  
void CCaptureDlg::OnAbout() LtMM89u  
{ }\7UU?@n  
 CAboutDlg dlg; @3O)#r}\  
 dlg.DoModal(); `!HD. E[2c  
} "Nj/{BU  
4r1\&sI$~  
void CCaptureDlg::OnBrowse() &o;0%QgF  
{ 3 J04 $cD  
 CString str; }:ZA)  
 BROWSEINFO bi; 7 D#y  
 char name[MAX_PATH]; iT4*~(p 3  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); bhpku=ov  
 bi.hwndOwner=GetSafeHwnd(); U-u?oU-.'  
 bi.pszDisplayName=name; )P:^A9&_n=  
 bi.lpszTitle="Select folder"; IFX$\+-  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; cZ?QI6|[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Jd>~gA}l  
 if(idl==NULL) s51$x M  
  return; J @"#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +hmFFQQ}  
 str.ReleaseBuffer(); @9gZH_ur>E  
 m_Path=str; g8%O^)d=>  
 if(str.GetAt(str.GetLength()-1)!='\\') &P|[YP37_  
  m_Path+="\\"; x [FLV8`b|  
 UpdateData(FALSE); <s'de$[  
} !-f Bw  
*n? 1C"l  
void CCaptureDlg::SaveBmp() @ivd|*?k0  
{ L9 D`hefz  
 CDC dc; d7X&3L%Oq  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); K}R+~<bIY  
 CBitmap bm; p%"dYH%]&0  
 int Width=GetSystemMetrics(SM_CXSCREEN); x.?5-3|d$  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,JV0ib,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); RU:Rt'  
 CDC tdc; Y$r78h=4  
 tdc.CreateCompatibleDC(&dc); Z nc(Q  
 CBitmap*pOld=tdc.SelectObject(&bm); eyJ07  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^[tE^(|T  
 tdc.SelectObject(pOld); ~ y!'\d>q<  
 BITMAP btm; hJ'H@L7  
 bm.GetBitmap(&btm); 6@J=n@J$p  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ZYwcB]xE z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); WD[eoi  
 BITMAPINFOHEADER bih; >0IZ%Wiz  
 bih.biBitCount=btm.bmBitsPixel; C|$q Vh>  
 bih.biClrImportant=0; 6gg8 h>b  
 bih.biClrUsed=0; $E\|\g  
 bih.biCompression=0; d!y*z  
 bih.biHeight=btm.bmHeight; <=q} Nd\  
 bih.biPlanes=1; 8vY-bm,e  
 bih.biSize=sizeof(BITMAPINFOHEADER); >d2Fa4u3  
 bih.biSizeImage=size; 5~JT*Ny  
 bih.biWidth=btm.bmWidth; H$(bSw$  
 bih.biXPelsPerMeter=0; zN4OrG 0  
 bih.biYPelsPerMeter=0; Ic#xz;elM  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); jmM|on!  
 static int filecount=0; 6Dq4Q|C  
 CString name; #.bW9j/  
 name.Format("pict%04d.bmp",filecount++); $"^K~5Q  
 name=m_Path+name; 86r5!@WN  
 BITMAPFILEHEADER bfh; u*l|MIi6J  
 bfh.bfReserved1=bfh.bfReserved2=0; wSTul o:9  
 bfh.bfType=((WORD)('M'<< 8)|'B'); B[t^u\Fk  
 bfh.bfSize=54+size; S\e&xUA;|  
 bfh.bfOffBits=54; xAQtX=FoX+  
 CFile bf; C9 n%!()>  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .V?:&_}_I6  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 'YNaLZ20  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); iQwQ5m!d &  
  bf.WriteHuge(lpData,size); yGZsNd {a&  
  bf.Close(); S(Yd.Sp  
  nCount++; E $@W~).!  
 } u/zBz*zh  
 GlobalFreePtr(lpData); :S+K\  
 if(nCount==1) [. 5m}V  
  m_Number.Format("%d picture captured.",nCount); T # \  
 else "ZuuSi  
  m_Number.Format("%d pictures captured.",nCount); &XP(D5lf`B  
  UpdateData(FALSE); Bh>L"'.2  
} d8j1L/e  
 P#,u9EIJ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) J!6FlcsZm  
{ yB*,)x0 @  
 if(pMsg -> message == WM_KEYDOWN) FK|O^- >B  
 { {4Of.  
  if(pMsg -> wParam == VK_ESCAPE) Hcq.Lq;2:  
   return TRUE; 'rD6MY  
  if(pMsg -> wParam == VK_RETURN) La26"C"X  
   return TRUE; P3$eomX'  
 } <B"sp r&1  
 return CDialog::PreTranslateMessage(pMsg); (q> TKM  
} /0h *(nL  
<j'V}|3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p\6cpf  
{ aV3:{oL  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ vJkc/7  
  SaveBmp(); N%y i4  
  return FALSE; ]b/]^1-(b  
} )*,/L <  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @ D+ftb/  
 CMenu pop; ^URCnJ67Se  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); mP(3[a_Q  
 CMenu*pMenu=pop.GetSubMenu(0); @fL ^I&++  
 pMenu->SetDefaultItem(ID_EXITICON); OZ,kz2SF#  
 CPoint pt; /HC:H,"i  
 GetCursorPos(&pt); [m t.2.  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); pm&TH d  
 if(id==ID_EXITICON) Ac7^JXh%  
  DeleteIcon(); kX 1}/l  
 else if(id==ID_EXIT) IUcL*  
  OnCancel(); NWBYpGZx  
 return FALSE; GXNf@&  
} [|u^:&az  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8sG3<$Z^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $Gn.G_"v  
 AddIcon(); e%4?-{(  
 return res; ^E !v D  
} #x%'U}sF  
90}{4&C.^  
void CCaptureDlg::AddIcon() QFyL2Xes/  
{ mCtS_"W  
 NOTIFYICONDATA data; YdY-Jg Xm  
 data.cbSize=sizeof(NOTIFYICONDATA); )&DAbB!O  
 CString tip; =BsV`p7rU  
 tip.LoadString(IDS_ICONTIP); {Z.6\G&q  
 data.hIcon=GetIcon(0); DT1gy:?L  
 data.hWnd=GetSafeHwnd(); x%P|T3Qy5  
 strcpy(data.szTip,tip); "(koR Q  
 data.uCallbackMessage=IDM_SHELL; Gn]36~)*H  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .p`4>XA  
 data.uID=98; g8),$:Uw  
 Shell_NotifyIcon(NIM_ADD,&data); )^h6'h`  
 ShowWindow(SW_HIDE); cH]tZ$E`  
 bTray=TRUE; dn6B43w  
} KWwtL"3  
W+XWS,(  
void CCaptureDlg::DeleteIcon() 7\u+%i;YZ  
{ zd?@xno  
 NOTIFYICONDATA data; J( }2Ua_  
 data.cbSize=sizeof(NOTIFYICONDATA); @u3`lhUcT  
 data.hWnd=GetSafeHwnd(); ^6 6!f 5^W  
 data.uID=98; .u`[|: K  
 Shell_NotifyIcon(NIM_DELETE,&data); q!K :N?  
 ShowWindow(SW_SHOW); D-3[# ~MV  
 SetForegroundWindow(); |Td+,>,  
 ShowWindow(SW_SHOWNORMAL); 4DXbeQs:  
 bTray=FALSE; CU$kh z"  
} aM^iDJ$>  
)oEVafNsT  
void CCaptureDlg::OnChange() gU9{~-9}  
{ X@nBj;   
 RegisterHotkey(); mgxIxusR  
} T?9D?u?]  
*P()&}JK  
BOOL CCaptureDlg::RegisterHotkey() [;E%o^/^  
{ ?5|;3N/zt  
 UpdateData(); dWY%bb  
 UCHAR mask=0; &}ZmT>q`$  
 UCHAR key=0; N,ht<l\  
 if(m_bControl) > =>/~dIb  
  mask|=4; ,m=F H?5  
 if(m_bAlt) [+#m THX  
  mask|=2; e4X df>B  
 if(m_bShift) N&8TG  
  mask|=1; ?M2(8 0  
  key=Key_Table[m_Key.GetCurSel()]; ;#B(L=/  
 if(bRegistered){ I8*VM3  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ;'!x  
  bRegistered=FALSE; ! \] ^c  
 } #GsOE#*>T  
 cMask=mask; SpH|<L3  
 cKey=key; ;D5>iek5  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ?0b-fL^^+l  
 return bRegistered; 95;{ms[  
} [ X*p [  
eK8H5YE  
  四、小结 e~h>b.~  
owVvbC2<b(  
  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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