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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: >2$Ehw:K^  
  PMXnupt  
  一、实现方法 iP' }eQn]c  
'*-X 3p  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: q. BqOa:  
%q ja:'k  
#pragma data_seg("shareddata") -! ;vX @  
HHOOK hHook =NULL; //钩子句柄 H@aCo(#  
UINT nHookCount =0; //挂接的程序数目 fjp>FVv3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 <!DOCvd  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 A=h`Z^8\B  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 1Rp|*>  
static int KeyCount =0; ?]h+En5z8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ^T^U:Zdq  
#pragma data_seg() hih`:y  
o/=K:5  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 %R&3v%$y*  
1egryp  
  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: I X\&lV  
w2$HP/90j  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Z$WT ~V  
cKey,UCHAR cMask) }[i35f[w  
{ Z|wZyt$$  
 BOOL bAdded=FALSE; RJtSHiM2  
 for(int index=0;index<MAX_KEY;index++){ zh50]tX  
  if(hCallWnd[index]==0){ @ju-cv+  
   hCallWnd[index]=hWnd; |'KNR]: N  
   HotKey[index]=cKey; ^/g&Q  
   HotKeyMask[index]=cMask; G]&:">&R  
   bAdded=TRUE; = b)q.2'#  
   KeyCount++; \vm'D'9  
   break; c+4SGWmO  
  } aG=Y 6j G  
 } %FyB\IQ  
 return bAdded; % )|/s %W  
} \ 2".Kb@=  
//删除热键 );Gt!]p`;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p=405~  
{ d,D)>Y'h  
 BOOL bRemoved=FALSE; IOmIkx&`GP  
 for(int index=0;index<MAX_KEY;index++){ KE5f`h  
  if(hCallWnd[index]==hWnd){ y?5*K  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4Nq n47|>e  
    hCallWnd[index]=NULL; rp1 u  
    HotKey[index]=0; ,][+:fvS  
    HotKeyMask[index]=0; \sRRLDj%  
    bRemoved=TRUE; C($`'~b  
    KeyCount--; X.272q<.  
    break; ~CM{?{z;  
   } 4|:{apH  
  } Y%&6qt G  
 } =,0E3:X^  
 return bRemoved; ?W(wtp,o  
} :Z< 5iLq  
<!w-op2@ir  
;UWdT]>!?  
  DLL中的钩子函数如下: LRbevpZ,  
=6+BBD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) F^ Q  
{ <o]tW4\(R  
 BOOL bProcessed=FALSE; Dt +"E  
 if(HC_ACTION==nCode) L)w& f  
 { b1 KiO2 E  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 'Y&yt"cs  
   switch(wParam) `__CL )N|  
   {  6DR8(j)=[%  
    case VK_MENU: 0{B5C[PTG  
     MaskBits&=~ALTBIT; *2>%>qu  
     break; m&$H ?yXW>  
    case VK_CONTROL: S$$:G$j  
     MaskBits&=~CTRLBIT; @:c 1+  
     break; ".@SQgyb0  
    case VK_SHIFT: c}{e,t  
     MaskBits&=~SHIFTBIT; riBT5  
     break; [I^SKvM  
    default: //judge the key and send message JT:9"lmJz,  
     break; F1,pAtA  
   } G A7  
   for(int index=0;index<MAX_KEY;index++){ <4! w2vxG  
    if(hCallWnd[index]==NULL) >T(f  
     continue; '+}hVfN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Qe4  
    { Lv_6Mf(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g^]Q*EBa  
     bProcessed=TRUE; *v 8 ]99N  
    } T}\U:@b  
   } iYnw?4Y  
  } $h$+EE!  
  else if((lParam&0xc000ffff)==1){ //有键按下 ),~Ca'TU  
   switch(wParam) ZRX>SyM  
   { @L~y%#  
    case VK_MENU: 7C 4Njei"  
     MaskBits|=ALTBIT; {2q   
     break; tq*Q|9j7VG  
    case VK_CONTROL: *wSl~J|ZM%  
     MaskBits|=CTRLBIT; Vl'=92t  
     break; 8F@6^9C  
    case VK_SHIFT: Y8AU<M  
     MaskBits|=SHIFTBIT; )Z^( +  
     break; oS`F Yy  
    default: //judge the key and send message > *_?^F_  
     break; ioviJ7N% O  
   } ec3('}X  
   for(int index=0;index<MAX_KEY;index++){ 7"QcvV@p  
    if(hCallWnd[index]==NULL) bh_ALu^CSX  
     continue; {#;6$dU;(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >kB?C!\  
    { v |i(peA#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C2b.([HE  
     bProcessed=TRUE; ]>AW  
    } -~aVt~{k/  
   } V~+Unn  
  } HK-?<$Yc  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 JZ<O-G+  
   for(int index=0;index<MAX_KEY;index++){ f{)*"  
    if(hCallWnd[index]==NULL) P_?1Rwm-45  
     continue; x x 'XR'zK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6iTDk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $6J5yE  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *i\7dJ Dj  
   } 3oIoQj+D  
  } w?/,LV  
 } o2.! G  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0}b8S48|?  
} (&x[>):6?  
;w+A38N$J  
  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: ~k J#IA  
&{ f5F7E@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ce;9UBkOg2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )Q\;N C=4  
\ 0CGS  
  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: 4dy)g)wM  
r|P4|_No  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l >O]Cpt  
{ *$s)p>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 7_{x '#7  
 { >!oN+8[~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 C :e 'wmA  
  SaveBmp(); l/1uP  
  return FALSE; 0J_x*k6  
 } xqG` _S l  
 …… //其它处理及默认处理 M'g4alS  
}  KL|B| u  
#{]=>n)j  
q|j;dI&  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 !.F\v .  
Gis'IX(  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 L%BWrmg  
\t1vYIY]T  
  二、编程步骤 *JDc1$H0  
jb*#!m.l  
  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"; ;DGWUK.U[H  
Jv7M[SJ#x  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 0~-+5V  
G3e%~  
  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; Dg]i};  
P"~ B2__*  
  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; ^yb_aCw  
.a^/r'?  
  5、 添加代码,编译运行程序。 l@GpVdrv  
Ea3tF0{  
三、程序代码 hgh1G7A&  
qVY\5`f@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL )zt5`"/o  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) x^;n fqn|  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Kp99y  
#if _MSC_VER > 1000 / )EB~|4']  
#pragma once ;3-ssF}k*  
#endif // _MSC_VER > 1000 Oq.) 8E.  
#ifndef __AFXWIN_H__ 4@VX%5uy  
#error include 'stdafx.h' before including this file for PCH Z-~^)lo  
#endif 5<S1,u5  
#include "resource.h" // main symbols :@p`E}1r{  
class CHookApp : public CWinApp H11Wb(6Wu  
{ I4)vJ0  
 public: >B9rr0d0  
  CHookApp(); tF'67,~W  
  // Overrides PK~okz4b  
  // ClassWizard generated virtual function overrides {!="PnB  
  //{{AFX_VIRTUAL(CHookApp) QoW3*1o  
 public: 'R$~U?i8  
  virtual BOOL InitInstance(); jVA xa|S  
  virtual int ExitInstance(); Fl O%O D  
  //}}AFX_VIRTUAL %GIla *  
  //{{AFX_MSG(CHookApp) gf!j|O;  
  // NOTE - the ClassWizard will add and remove member functions here. n2QD*3i  
  // DO NOT EDIT what you see in these blocks of generated code !  'dg OE  
  //}}AFX_MSG Oll\T GXP!  
  DECLARE_MESSAGE_MAP() $51#xe  
}; ;Rt,"W)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); c]O4l2nCL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `j2z=5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1k7E[G~G|  
BOOL InitHotkey(); @!Pq"/  
BOOL UnInit(); leiza?[  
#endif b :+ X3  
Qejzp/2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. +uH1rF_&@  
#include "stdafx.h" ik]UzB  
#include "hook.h" rUuM__;d  
#include <windowsx.h> ugL$W@   
#ifdef _DEBUG =EG[_i{r  
#define new DEBUG_NEW  [g/g(RL  
#undef THIS_FILE @Wv*`  
static char THIS_FILE[] = __FILE__; I7}[%(~Sf/  
#endif N@) D,~  
#define MAX_KEY 100 7<) .luV  
#define CTRLBIT 0x04 p'R}z|d)  
#define ALTBIT 0x02 ?iq:Gf  
#define SHIFTBIT 0x01 /!LfEO  
#pragma data_seg("shareddata") BEY}mR]  
HHOOK hHook =NULL; 7[K$os5al  
UINT nHookCount =0; tV T(!&(  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey zi5;>Iv0}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT P3:hGmk8|j  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey |+[ bKqI5  
static int KeyCount =0; t#d~gBe?V  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0h5T&U]${Y  
#pragma data_seg() r..Rh9v/=E  
HINSTANCE hins; eQNYfWR  
void VerifyWindow(); T+gqu &9R  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) sqkPC_;A  
//{{AFX_MSG_MAP(CHookApp) {% ;tN`{M  
// NOTE - the ClassWizard will add and remove mapping macros here. .<tb*6rX>  
// DO NOT EDIT what you see in these blocks of generated code! -m-~  
//}}AFX_MSG_MAP ,H|V\\  
END_MESSAGE_MAP() 1_F2{n:yp  
:lcoSJ  
CHookApp::CHookApp() `?La  
{ z S^:Ng5  
 // TODO: add construction code here, hnyZXk1|  
 // Place all significant initialization in InitInstance -()CgtSR  
} X)'uTf0  
9/0<Z_b2  
CHookApp theApp; eO*FoN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -`A6K!W&~p  
{ .)Du ;  
 BOOL bProcessed=FALSE; \# #~Tq  
 if(HC_ACTION==nCode) rFGbp8(2  
 { VJm).>E3k  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2'N%KKmJL  
   switch(wParam) -MeGJX:^I  
   { QKe=/;  
    case VK_MENU: h19c*,0z!  
     MaskBits&=~ALTBIT; yv&&x.!.Z  
     break; >+&524xc  
    case VK_CONTROL: 7hQrL+%q8  
     MaskBits&=~CTRLBIT; YQ;?N66  
     break; s<aJ pi{n4  
    case VK_SHIFT: Hh,q)(Wo  
     MaskBits&=~SHIFTBIT; V) C4 sG  
     break; /u5MAl.<[  
    default: //judge the key and send message gP? pfFhG  
     break; bF<FX_}!s!  
   } jq%Qc9y  
   for(int index=0;index<MAX_KEY;index++){ A-qdTJP  
    if(hCallWnd[index]==NULL) ,d$V-~2,  
     continue; h# B%'9r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T5Yu+>3  
    { %?^IS&]Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1@egAo)  
     bProcessed=TRUE; P|l62!m<   
    } MQ7N8@!t  
   } UBLr|e>dQE  
  } wL\OAM6R  
  else if((lParam&0xc000ffff)==1){ //Key down **N{XxdN  
   switch(wParam) TY"8.vd  
   { //xK v{3fI  
    case VK_MENU: -c{O!z6sX  
     MaskBits|=ALTBIT; TgoaEufS<  
     break; 0Q`Dp;a5&  
    case VK_CONTROL: oSq?. *w<  
     MaskBits|=CTRLBIT; Arc6d5Q  
     break; H Rn Q*  
    case VK_SHIFT: 9J+ p.N  
     MaskBits|=SHIFTBIT; TF R8  
     break; f#f<Ii  
    default: //judge the key and send message <Nwqt[.  
     break; Lyo!}T  
   } ~.7/o0'+  
   for(int index=0;index<MAX_KEY;index++) @G,pM: t  
   { ;UUpkOQO(  
    if(hCallWnd[index]==NULL) 69N/_V  
     continue; & 6 wD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Di) %vU  
    { F#-mseKhc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); kD;1+lNz  
     bProcessed=TRUE; &YpViC4K.  
    } *hWpJEV  
   } >-oB%T  
  } M$YU_RPl+  
  if(!bProcessed){ *uW l 804  
   for(int index=0;index<MAX_KEY;index++){ +{#65 z  
    if(hCallWnd[index]==NULL) v'RpsCov  
     continue; J,(@1R]KF:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) O"^3,-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?qC6p|H  
   } %B}<5iO  
  } `)~]3zmG  
 } 05>mRqVL  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5}C.^J`  
} d?ru8  
OCW0$V6;D-  
BOOL InitHotkey() 6C'W  
{ 4t 5i9+h  
 if(hHook!=NULL){ +P! ibHfP  
  nHookCount++; 7F5v-/  
  return TRUE; =e)t,YVm  
 } ~7=eHU.@  
 else 6.Jvqn  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); W{RZ@ 3ZY  
  if(hHook!=NULL) t]IHQ8  
   nHookCount++; _^/k  
  return (hHook!=NULL); =fRC$  
} l*>,K2F  
BOOL UnInit() ~U r  
{ .} O@<t  
 if(nHookCount>1){ Wu~cy}\  
  nHookCount--; !F:ANoaS  
  return TRUE; **V8a-@  
 } <Hf3AB;#4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); c>Tf@A og>  
 if(unhooked==TRUE){ O llS  
  nHookCount=0; r.q*S4IS.m  
  hHook=NULL; v,'k 2H  
 } %9 3R/bx  
 return unhooked; "XQ3mi`y  
} 9a2[_Wy  
Sse%~:FL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?edf$-"z/  
{ o|$r;<o3R  
 BOOL bAdded=FALSE; .p =OAh<  
 for(int index=0;index<MAX_KEY;index++){ BG6.,'~7o  
  if(hCallWnd[index]==0){ ^g |j4N  
   hCallWnd[index]=hWnd; 7Ll? #eun  
   HotKey[index]=cKey; |:.s6a#(  
   HotKeyMask[index]=cMask; 2"T b><^"  
   bAdded=TRUE; &OlX CxH  
   KeyCount++; ihJ!]#Fbm  
   break; H:EK&$sU  
  } OMW]9E  
 } 3@nIoN'z  
 return bAdded; u/<ZGW(&s(  
} <:!E'WT#f  
rd>>=~vx=/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h<V,0sZ&:  
{ sSf;j,7V  
 BOOL bRemoved=FALSE; =), O;M  
 for(int index=0;index<MAX_KEY;index++){ >z~_s6#CP  
  if(hCallWnd[index]==hWnd){ x+DETRLP  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ q:nUn?zB  
    hCallWnd[index]=NULL; );T&pm:C>  
    HotKey[index]=0; y #C9@C  
    HotKeyMask[index]=0; a x)J!I18  
    bRemoved=TRUE; 15VvZ![$V  
    KeyCount--; z;?ztpa@  
    break; QW'*^^  
   } ePZ Ai"k  
  } >0[:uu,'>  
 } Z t4q= Lr  
 return bRemoved; Ie K+  
} AFM+`{Cq  
j D*<M/4  
void VerifyWindow() HY eCq9S  
{ :Jf</uP_  
 for(int i=0;i<MAX_KEY;i++){ C~ A`h=A<  
  if(hCallWnd!=NULL){ QgKR=GR6  
   if(!IsWindow(hCallWnd)){ 7x77s  
    hCallWnd=NULL; r*8a!jm?  
    HotKey=0; q6*i/"mN*  
    HotKeyMask=0; 6&5D4 V  
    KeyCount--; `mW~{)x  
   } XZ{rKf2  
  } ~(^pGL3<  
 } x_I*6?  
} ?&zi{N  
Z m%,L$F*L  
BOOL CHookApp::InitInstance() n_rpT .[  
{ >Ut: -}CS  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); '^C *%"I]  
 hins=AfxGetInstanceHandle(); 5073Q~  
 InitHotkey(); *!TQC6b$  
 return CWinApp::InitInstance(); &;pM<h  
} wsQ],ZE  
]cv|dc=  
int CHookApp::ExitInstance() q]C_idK=  
{ CbW[_\  
 VerifyWindow(); _68vSYr  
 UnInit(); +c!HXX  
 return CWinApp::ExitInstance(); :*h1ik4t  
} 2HSFMgy  
U}DE9e{/!  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;-JFb$m  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) R) :Xs .  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ $M4Z_zle)  
#if _MSC_VER > 1000 [<{r~YFjWW  
#pragma once hu} vYA7ZH  
#endif // _MSC_VER > 1000 EI*~VFx  
kr~n5WiAZ  
class CCaptureDlg : public CDialog N?-ZvE\C  
{ l'_]0%o]  
 // Construction nA_'j l  
 public: /YUW)?o!^N  
  BOOL bTray; 0,)2\`99#k  
  BOOL bRegistered; ?wlRHVZ  
  BOOL RegisterHotkey(); pZeO dh  
  UCHAR cKey; LQr!0p.i"  
  UCHAR cMask; CJCxL\  
  void DeleteIcon(); s@iY'11  
  void AddIcon(); ) 9 2(C  
  UINT nCount; fNu/>pN  
  void SaveBmp(); #9r}Kr=P  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 6,jCO@!   
  // Dialog Data w' J`$=  
  //{{AFX_DATA(CCaptureDlg) D&"lu*"tg  
  enum { IDD = IDD_CAPTURE_DIALOG }; ]S]W|m7=.Z  
  CComboBox m_Key; 0wNlt#G;{  
  BOOL m_bControl; k7rg:P  
  BOOL m_bAlt; wMN{9Ce3j  
  BOOL m_bShift; 13Z,;YW  
  CString m_Path; ,aUbB8  
  CString m_Number; csLbzDg  
  //}}AFX_DATA aXqig&:  
  // ClassWizard generated virtual function overrides ezL1,GT  
  //{{AFX_VIRTUAL(CCaptureDlg) b\H&E{Gn|x  
 public: aACPyfGQ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); :Ch XzZ  
 protected: W/,:-R&'>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )4qspy3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "|dhmV[;  
  //}}AFX_VIRTUAL 7<)  
  // Implementation dL+yd0 b*  
 protected: /D;ugc*3  
  HICON m_hIcon; BI-'&kPk  
  // Generated message map functions 7bO>[RQB  
  //{{AFX_MSG(CCaptureDlg) /1{:uh$  
  virtual BOOL OnInitDialog(); w.J$(o(/  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); N2}Y8aR~  
  afx_msg void OnPaint(); p.8  
  afx_msg HCURSOR OnQueryDragIcon(); 9#hp]0S6  
  virtual void OnCancel(); ?qSwV.l]d  
  afx_msg void OnAbout(); T6\]*mlr  
  afx_msg void OnBrowse(); @|t]9  
  afx_msg void OnChange(); tKe-Dk9  
 //}}AFX_MSG <Fx%P:d  
 DECLARE_MESSAGE_MAP() R+K|K2"  
}; j5:4/vD  
#endif 11#b%dT  
AhA&=l i;  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #W8?E_iu  
#include "stdafx.h" N;-%:nC  
#include "Capture.h" M6Xzyt|  
#include "CaptureDlg.h" hO3 q|SL  
#include <windowsx.h> wN%lc3[/z2  
#pragma comment(lib,"hook.lib") AD`5:G  
#ifdef _DEBUG ^W@8KB  
#define new DEBUG_NEW ']\SX*z?  
#undef THIS_FILE `<v$+mG  
static char THIS_FILE[] = __FILE__; >\:GFD{z  
#endif UNiK6h_%  
#define IDM_SHELL WM_USER+1 V0 Z8VqV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v,QvCozOz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v%2Dz  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P=<lY},  
class CAboutDlg : public CDialog z3L=K9)  
{ McS]aJfrk  
 public: !Z\Gv1  
  CAboutDlg(); j8 2w 3  
  // Dialog Data XMZ$AeF@  
  //{{AFX_DATA(CAboutDlg) gSwHPm%zn  
  enum { IDD = IDD_ABOUTBOX }; D8~\*0->  
  //}}AFX_DATA V*2 * 5hx  
  // ClassWizard generated virtual function overrides I9xu3izAmR  
  //{{AFX_VIRTUAL(CAboutDlg) x_<#28H!  
 protected: p8-$MF]] 6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support '4#NVXVQm  
  //}}AFX_VIRTUAL ?Q"<AL>Z  
  // Implementation y1}2hT0,  
 protected: *6AqRE  
  //{{AFX_MSG(CAboutDlg) "0 %f R"  
  //}}AFX_MSG AsuugcN*  
  DECLARE_MESSAGE_MAP() ) ] Ro  
}; MxX)&327  
[9 :9<#?o^  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >)*d/^  
{ @Z#h?:  
 //{{AFX_DATA_INIT(CAboutDlg) a[j]fv*6  
 //}}AFX_DATA_INIT baTd;`Pn  
} z!b:|*m]w  
Y?K?*`Pkc1  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) yk4py0xVl  
{ t(PA+~sIp  
 CDialog::DoDataExchange(pDX); v)|a}5={  
 //{{AFX_DATA_MAP(CAboutDlg) bYem0hzOe  
 //}}AFX_DATA_MAP WnOYU9 ;%  
} ?G!p4u?C  
#pW!(tfN^a  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) C{t}q*fG 5  
 //{{AFX_MSG_MAP(CAboutDlg) 2{ l|<'  
 // No message handlers izl-GitP  
 //}}AFX_MSG_MAP 3rN}iSF^  
END_MESSAGE_MAP() I(&N2L$-  
uhaHY`w  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) IS[q'Cv*  
: CDialog(CCaptureDlg::IDD, pParent) XrMw$_0)  
{ XJl 3\*  
 //{{AFX_DATA_INIT(CCaptureDlg) qJl DQc-  
  m_bControl = FALSE; W:wSM *  
  m_bAlt = FALSE; = 4|"<8'  
  m_bShift = FALSE; Dh#5-Kf%  
  m_Path = _T("c:\\"); N^F5J  
  m_Number = _T("0 picture captured."); @J^ Oy 3z  
  nCount=0; %Y#W#G  
  bRegistered=FALSE; {H9g&pfv  
  bTray=FALSE; >OjK0jiPf  
 //}}AFX_DATA_INIT m`xYd  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \>.[QQVI"l  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;Tq4!w'rH  
} -<T> paE9  
B 'd@ms  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /Gb)BJk!  
{ ?TW?2+  
 CDialog::DoDataExchange(pDX); ,*x/L?.Z!  
 //{{AFX_DATA_MAP(CCaptureDlg) +>u 8r&Jw.  
  DDX_Control(pDX, IDC_KEY, m_Key); wF6a*b@v  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); D6yE/QeK4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 5yV>-XT+-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +zo\#8*0MF  
  DDX_Text(pDX, IDC_PATH, m_Path); Y|/,*,u+  
  DDX_Text(pDX, IDC_NUMBER, m_Number); nS.qK/.s  
 //}}AFX_DATA_MAP $|!3ks  
} ,CqGO %DY  
y<v-,b*  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 28}L.>5k  
//{{AFX_MSG_MAP(CCaptureDlg) 7fT_]H8  
 ON_WM_SYSCOMMAND() g~=- ,j|  
 ON_WM_PAINT() wYv++< z  
 ON_WM_QUERYDRAGICON() Wn2J]BH  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) pd.pY*B<[  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) gKWUHlQY  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +j8-l-o  
//}}AFX_MSG_MAP n5fc_N/8O=  
END_MESSAGE_MAP() )U}`x }:,  
(ze9-!%  
BOOL CCaptureDlg::OnInitDialog() a?W<<9]  
{ tjne[p  
 CDialog::OnInitDialog(); \y7\RV>>3b  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |NFDrm  
 ASSERT(IDM_ABOUTBOX < 0xF000); |F ~U  
 CMenu* pSysMenu = GetSystemMenu(FALSE); zrC1/%T  
 if (pSysMenu != NULL) kp)1s>c  
 { _.W;hf`  
  CString strAboutMenu; zItGoJu  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 99~-TiU  
  if (!strAboutMenu.IsEmpty()) u*7>0o|H:  
  { rPifiLl A>  
   pSysMenu->AppendMenu(MF_SEPARATOR);  6\QsK96_  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);  SmAF+d  
  } H]{`q  
 } B/JMH 1r  
 SetIcon(m_hIcon, TRUE); // Set big icon J b7^'P  
 SetIcon(m_hIcon, FALSE); // Set small icon gm: xtN  
 m_Key.SetCurSel(0); 7U&<{U<  
 RegisterHotkey(); v/Xz.?a\jF  
 CMenu* pMenu=GetSystemMenu(FALSE); qFY>/fCP4  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 5^2P\y(?  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \LM{.g zT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4(8BWP~.y2  
 return TRUE; // return TRUE unless you set the focus to a control CL!s #w1I\  
} nc#} \  
aSfAu!j)  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) _U~~[I  
{ YE-}1&8  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~ =$d>ZNQ  
 { t"&qaG{  
  CAboutDlg dlgAbout; OlsD  
  dlgAbout.DoModal(); ]_! . xx>  
 } wJWofFz  
 else 6eK7Jv\K  
 { }};AV)}J  
  CDialog::OnSysCommand(nID, lParam); -9q3]nmT(  
 } p2wDk^$  
} 42PA?^xPw  
6J3<k(#:  
void CCaptureDlg::OnPaint() ,Y0qGsV  
{ Mg\8m-L^  
 if (IsIconic()) \8Yv}wQ  
 { =n_>7@9l  
  CPaintDC dc(this); // device context for painting fRcy$  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Ap<j;s4`  
  // Center icon in client rectangle ]P4?jKI  
  int cxIcon = GetSystemMetrics(SM_CXICON); yO J|t#  
  int cyIcon = GetSystemMetrics(SM_CYICON); *#o2b-[V  
  CRect rect; <s (o?U  
  GetClientRect(&rect); |I=GI]I  
  int x = (rect.Width() - cxIcon + 1) / 2; "1-z'TV=  
  int y = (rect.Height() - cyIcon + 1) / 2; o? wEX%  
  // Draw the icon 207h$a,  
  dc.DrawIcon(x, y, m_hIcon); LP//\E_]  
 } E*#5OT  
 else D'"l%p  
 { ?H21Ru>:*  
  CDialog::OnPaint(); < *db%{  
 } xHuw ?4  
} mS &^xWPV  
6JE_rAab  
HCURSOR CCaptureDlg::OnQueryDragIcon() a}kPc}n\  
{ E.^F:$2  
 return (HCURSOR) m_hIcon; ZE6W"pbjU  
} NrfAr}v'E  
_5v]69C#  
void CCaptureDlg::OnCancel() fvZ[eJ  
{ l#3jJn  
 if(bTray) E5t /-4  
  DeleteIcon(); mC!^`y)  
  CDialog::OnCancel(); v=?/c-J*  
} s#)0- Zj  
/3qKsv#  
void CCaptureDlg::OnAbout() !~ZAm3GwL  
{ E[>A# l53  
 CAboutDlg dlg; 3ZX#6*(}2  
 dlg.DoModal(); N=c{@h  
} 9]^NAlno  
\NQ[w7  
void CCaptureDlg::OnBrowse() z KNac[:  
{ C$`^(?iO/  
 CString str; lO8GnkLE  
 BROWSEINFO bi; *:Y9&s^6j  
 char name[MAX_PATH]; $!\Z_ :  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 9K=K,6 b  
 bi.hwndOwner=GetSafeHwnd(); 4+F@BxpB  
 bi.pszDisplayName=name; ,o [FUi(#@  
 bi.lpszTitle="Select folder"; Nq[-.}Z6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; O]Q8&(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); DfVSG1g  
 if(idl==NULL) GCp90  
  return; FQ]5W |e  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); '2m"ocaf  
 str.ReleaseBuffer(); .8]=yPm  
 m_Path=str; 8j8~?=$a6Q  
 if(str.GetAt(str.GetLength()-1)!='\\') 8FgF6ip  
  m_Path+="\\"; ``Rg0o  
 UpdateData(FALSE); 5)p!}hWs  
} ]NY^0SqM  
j.KV :zJU  
void CCaptureDlg::SaveBmp() q`HK4~i,  
{ /1?{,Das=  
 CDC dc; A2I\T, Z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); gg$:U  
 CBitmap bm; j/hm)*\io  
 int Width=GetSystemMetrics(SM_CXSCREEN); E=qfI>2U&  
 int Height=GetSystemMetrics(SM_CYSCREEN); r,wC5%&Za  
 bm.CreateCompatibleBitmap(&dc,Width,Height); fP{IW`t}]  
 CDC tdc; W ZW:q  
 tdc.CreateCompatibleDC(&dc); eyG[1EEU  
 CBitmap*pOld=tdc.SelectObject(&bm); 7h\U}!  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); zu``F]B  
 tdc.SelectObject(pOld); CA ,2&v"  
 BITMAP btm; \|$GBU  
 bm.GetBitmap(&btm); K#]FUUnj=  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; x^y&<tA  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FUZ`ST+OL  
 BITMAPINFOHEADER bih; M(W-\ L  
 bih.biBitCount=btm.bmBitsPixel; /.:&9 c  
 bih.biClrImportant=0; ?cgb3^R'  
 bih.biClrUsed=0; x24&mWgU  
 bih.biCompression=0; nT@FS t  
 bih.biHeight=btm.bmHeight; gO kum_  
 bih.biPlanes=1; HvW6=d(#  
 bih.biSize=sizeof(BITMAPINFOHEADER); P(i E"KH;  
 bih.biSizeImage=size; >!#or- C  
 bih.biWidth=btm.bmWidth; Q6fPqEX=  
 bih.biXPelsPerMeter=0; 1yjP`N  
 bih.biYPelsPerMeter=0; "Fqrk>Q~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); PAv<J<d  
 static int filecount=0; -_BjzA|  
 CString name; |JTDwmR  
 name.Format("pict%04d.bmp",filecount++); )Z63 cr/  
 name=m_Path+name; 4,:)%KB"V  
 BITMAPFILEHEADER bfh; ilFS9A3P  
 bfh.bfReserved1=bfh.bfReserved2=0; >;k~B  
 bfh.bfType=((WORD)('M'<< 8)|'B'); W";Po)YC  
 bfh.bfSize=54+size; {AAi x  
 bfh.bfOffBits=54; J24H}^~na  
 CFile bf; $ZnVs@:S  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ OCI{)r<O2m  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); tMr$N[@r  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ^Rmrre`uU  
  bf.WriteHuge(lpData,size); wO"ezQ  
  bf.Close(); dlc'=M  
  nCount++; 1Ewg_/R  
 } +!"7=?}  
 GlobalFreePtr(lpData); n2&M?MGX  
 if(nCount==1) -A1:S'aN-  
  m_Number.Format("%d picture captured.",nCount); uN(N2m  
 else KZwzQ"Hl  
  m_Number.Format("%d pictures captured.",nCount); @D@'S:3  
  UpdateData(FALSE); |@*   
} $kn"S>jV  
DWu~%U8  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) V-z F'KI[  
{ +!<{80w  
 if(pMsg -> message == WM_KEYDOWN) u|\K kk  
 { vjYG>YhV  
  if(pMsg -> wParam == VK_ESCAPE) [ jgC`  
   return TRUE; rvBKJ!b0  
  if(pMsg -> wParam == VK_RETURN) E1Rz<&L  
   return TRUE; t}Kzh`  
 } =N{-lyr)  
 return CDialog::PreTranslateMessage(pMsg); -/J2;AkGH  
} j'&a)-Wx_  
~Ec@hz]js  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) e}q!m(K]e-  
{ LrnE6 U9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ QlWkK.<Z3_  
  SaveBmp(); T( sEk  
  return FALSE; 0/?=FM >  
} f{f|frs  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ d15E$?ZLH  
 CMenu pop; )\,hc$<=m  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \|Ya*8V  
 CMenu*pMenu=pop.GetSubMenu(0); vKNxL^x  
 pMenu->SetDefaultItem(ID_EXITICON); p|R]/C0f  
 CPoint pt; C~:!WRCz  
 GetCursorPos(&pt); [LHfH3[gU  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); RaY=~g  
 if(id==ID_EXITICON) i+B tz-  
  DeleteIcon(); xm}`6B^f  
 else if(id==ID_EXIT) j=TG&#e  
  OnCancel(); 4p_@f^v~QH  
 return FALSE; Cr%6c3aQ  
} [:C!g#o  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `PvGfmYOl  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) cy4V*zwp  
 AddIcon(); Sh RkL<  
 return res; XW9 [VUW~  
} oi}\;TG  
vt-5 3fa|  
void CCaptureDlg::AddIcon() RVb}R<yU+  
{ B|n<{g[-cM  
 NOTIFYICONDATA data; JIyIQg'5i  
 data.cbSize=sizeof(NOTIFYICONDATA); mbRN W  
 CString tip; YC0FXNV  
 tip.LoadString(IDS_ICONTIP); rJl'+Ae9N|  
 data.hIcon=GetIcon(0); _"#ucM=B:-  
 data.hWnd=GetSafeHwnd(); Gm1vVHAxv  
 strcpy(data.szTip,tip); cYMlc wS  
 data.uCallbackMessage=IDM_SHELL; k,nRC~Irh  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; j(maj  
 data.uID=98; fr<, LC.  
 Shell_NotifyIcon(NIM_ADD,&data); zSFqy'b.M-  
 ShowWindow(SW_HIDE); #.n%$r  
 bTray=TRUE; RW. >;|m  
} t'0dyQ%u  
"|l-NUe  
void CCaptureDlg::DeleteIcon() kGSB6  
{ s8<)lO<SV.  
 NOTIFYICONDATA data; 4aQb+t,  
 data.cbSize=sizeof(NOTIFYICONDATA); 1RF? dv  
 data.hWnd=GetSafeHwnd(); JH0L^p   
 data.uID=98; P$=Y5   
 Shell_NotifyIcon(NIM_DELETE,&data); U3yIONlt  
 ShowWindow(SW_SHOW); SlZ>N$E  
 SetForegroundWindow(); } 6Uw4D61  
 ShowWindow(SW_SHOWNORMAL); 6M`N| %  
 bTray=FALSE; G:2m)0bW  
} g.d%z  
DEw_dOJ(  
void CCaptureDlg::OnChange() bLysUj5[5  
{ V3u[{^^f  
 RegisterHotkey(); 6*<=(SQI  
} # N.(ZP  
cR1dGNcp/@  
BOOL CCaptureDlg::RegisterHotkey() ]jz%])SzH  
{ xNh#=6__9  
 UpdateData(); ;_lEu" -  
 UCHAR mask=0; -/.Xf<y58  
 UCHAR key=0; })R8VJ&C/  
 if(m_bControl) *kXSl73 k  
  mask|=4; 0NB6S&lI^k  
 if(m_bAlt) Oop;Y^gG}  
  mask|=2; cia4!-#  
 if(m_bShift) b&;1b<BwD  
  mask|=1; Xp=Y<`dX  
  key=Key_Table[m_Key.GetCurSel()]; yuvt<kz  
 if(bRegistered){ _ G!lQ)1  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); IwIk;pB O  
  bRegistered=FALSE; >69+e+|I  
 } Ok+zUA[Wu  
 cMask=mask; aPq9^S*  
 cKey=key; D@yg)$;z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }*~EA=YN;  
 return bRegistered; 6}.B2f9  
} fn zj@_{|  
Rla4XN=mf  
  四、小结 . F0V  
/vl]Oa&U  
  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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