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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: ;9$71E  
  h'ik19  
  一、实现方法 v8f1o$R  
_=-B%m  
  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: Cd2A&RB  
-+{<a!Nb  
#pragma data_seg("shareddata") U'k 0;  
HHOOK hHook =NULL; //钩子句柄 fs\A(]`$  
UINT nHookCount =0; //挂接的程序数目 M`) /^S9  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 c8 Je&y8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 1Y'NG<d _  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey H5>?{(m  
static int KeyCount =0; a&RH_LjM  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 K*S3{s%UR  
#pragma data_seg() Fj4>)!^kM  
WT63ve  
  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。 75^AO>gt   
AF\Jh+ynT!  
  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: 0TWd.+  
A<''x'\/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR gy>B 5ie  
cKey,UCHAR cMask) 5.d[C/pRw  
{ L@s_)?x0  
 BOOL bAdded=FALSE; -}(2}~{e(  
 for(int index=0;index<MAX_KEY;index++){ l}SHR|7<  
  if(hCallWnd[index]==0){ o3YW(%cYR  
   hCallWnd[index]=hWnd; 0p]v#z}  
   HotKey[index]=cKey; @2g <d  
   HotKeyMask[index]=cMask; hjD%=Ri0Z  
   bAdded=TRUE; %'OY  
   KeyCount++; _Wqy,L;J  
   break; ;2P  
  } KX J7\}  
 } 2F :8=_sA  
 return bAdded; 8PR\a!"  
} L3=5tuQ[5  
//删除热键 Qk72ra)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +/ rt'0o  
{ V]NCFG  
 BOOL bRemoved=FALSE; 2Gh&h(  
 for(int index=0;index<MAX_KEY;index++){ lg +>.^7k  
  if(hCallWnd[index]==hWnd){ R*/s#*gmL  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ < 1[K1'7h  
    hCallWnd[index]=NULL; sGa}Cf;H@g  
    HotKey[index]=0; Ad&VOh+0  
    HotKeyMask[index]=0; 3$wK*xK  
    bRemoved=TRUE; CEW1T_1U<\  
    KeyCount--; LXqPNVp#  
    break; A `{hKS  
   } }OY/0p-Z  
  } XY#.?<"Q8  
 } X|-[i hp;  
 return bRemoved; RqX^$C8M  
} 0j;q^>  
yd=b!\}WJ  
5] LfJh+"n  
  DLL中的钩子函数如下: z]7/Gc,j  
E>+>!On)b  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) " T9UedZ  
{ !2h ZtX  
 BOOL bProcessed=FALSE; Gk]ZP31u  
 if(HC_ACTION==nCode) t{s*,X\b  
 { k!Q{u2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 q=}1ud}1  
   switch(wParam) DD2K>1A1  
   {  .+,U9e:%  
    case VK_MENU: Wy%FF\D.Y  
     MaskBits&=~ALTBIT; 6$[7hlE  
     break; T*nP-b  
    case VK_CONTROL: zz /4 ()u  
     MaskBits&=~CTRLBIT; 3)yL#hXg)  
     break; vA}_x7}n(  
    case VK_SHIFT: l0C`teO  
     MaskBits&=~SHIFTBIT; mRa\ wEg%  
     break; 0<O()NMv  
    default: //judge the key and send message )2_[Ww|.  
     break; c]zFZJ6M  
   } 3{f g3?  
   for(int index=0;index<MAX_KEY;index++){ A,BYi$  
    if(hCallWnd[index]==NULL) z0OxJe  
     continue; J#t-." f6^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6tFi\,)E  
    { =r*Ykd;W|E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^qnmKA>"F  
     bProcessed=TRUE; m7DKC,  
    } J\P6  
   } G;$; $gM  
  } 'qvj[lpGr  
  else if((lParam&0xc000ffff)==1){ //有键按下 K|YB)y  
   switch(wParam) _OC@J*4.  
   { BlQ X$s]  
    case VK_MENU: X8">DR&>Y  
     MaskBits|=ALTBIT; u~aRFQ:  
     break; Qz3Z_V4k9  
    case VK_CONTROL: 5C&*PJ~WA  
     MaskBits|=CTRLBIT; 4hODpIF  
     break; (|F.3~Amq  
    case VK_SHIFT: $rI 1|;^  
     MaskBits|=SHIFTBIT; Fn7OmxfD  
     break; vFB^h1k~.M  
    default: //judge the key and send message ZP5 !O[Ut  
     break; JJM<ywPGp  
   } 2 rr=FJ  
   for(int index=0;index<MAX_KEY;index++){ QW$p{ zo  
    if(hCallWnd[index]==NULL) l<BV{Gl  
     continue; !1fZ7a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O`Gq7=X  
    { @0 /qP<E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -sfv"?  
     bProcessed=TRUE; ;}j(x;l>t  
    } &iVdqr1,  
   } 2 U]d 1  
  } r34MDUZdI  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 RFy MRE!?  
   for(int index=0;index<MAX_KEY;index++){ y;uR@{  
    if(hCallWnd[index]==NULL) 31@Lr[!  
     continue; t2s/zxt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 10i$b<O  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); o$buoGSPc  
     //lParam的意义可看MSDN中WM_KEYDOWN部分  +l/v`=C  
   } :Ys~Lt54  
  } tw>2<zmSi%  
 } !7 dct#4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); qS2Nk.e]o  
} "GZi eI D  
u }gavG l  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: P=5+I+  
3_~iq>l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); > :IWRc2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NOuG#P  
L]|mWyzT  
  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:  7P7OTN  
EP 4]#]5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {@^;Nw%J  
{ B+j]C$8}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Z(T{K\)uN  
 { RHg-Cg`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 J6AHc"k.  
  SaveBmp(); `(sb  
  return FALSE; R<Lf>p>_  
 } N);w~)MYh  
 …… //其它处理及默认处理 wOl?(w=|  
} WXl+w7jr  
ksOGCd^G7  
6JDHwV  
  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。 hd(FOKOP  
`x#Ud)g  
  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。 @)?]u U"L  
K"H\gmV_ g  
  二、编程步骤 ) ;\c{QF  
3/@z4:p0R  
  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"; -f)fiQ-<  
FT@uZWgQ=  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; M  9t7y  
15\m.Ix  
  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; ^AS \a4`/  
:x)H!z P  
  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; #Ub_m@@ 4  
Z[oEW>_A  
  5、 添加代码,编译运行程序。 lUm(iYv;H  
T)rE#"_]{  
三、程序代码 L^3&  
.$%p0Yx+  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ,erf{"Nh  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 0jf6 z-4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \ ;npdFy  
#if _MSC_VER > 1000 ,vJt!}}  
#pragma once :TH cI;PG8  
#endif // _MSC_VER > 1000 tcuwGs>_  
#ifndef __AFXWIN_H__ <EpL<K%  
#error include 'stdafx.h' before including this file for PCH rp||#v0l!w  
#endif f'^uuO#x  
#include "resource.h" // main symbols /x6p  
class CHookApp : public CWinApp a/sjW  
{ `hi=y BO  
 public: //q(v,D%Q  
  CHookApp(); vxOqo)yO  
  // Overrides &12K pEyf  
  // ClassWizard generated virtual function overrides _\ToA9m  
  //{{AFX_VIRTUAL(CHookApp) b-&iJ &>'  
 public: ;u UFgDi  
  virtual BOOL InitInstance(); [1VA`:?W  
  virtual int ExitInstance(); QPJ \Iu@D$  
  //}}AFX_VIRTUAL elOeXYO0  
  //{{AFX_MSG(CHookApp) {r,U ik-nL  
  // NOTE - the ClassWizard will add and remove member functions here. wA=r ]BT  
  // DO NOT EDIT what you see in these blocks of generated code ! G<;~nAo?f0  
  //}}AFX_MSG $ J`O-"M  
  DECLARE_MESSAGE_MAP() h:YD $XE  
}; 5ilGWkb`'X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); N+|NI?R?}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GM%+yS}(P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n|w+08c"  
BOOL InitHotkey(); )/H;5 cn  
BOOL UnInit(); Oj5UG*  
#endif jT{T#_  
sgX!4wG&Z  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2bp@m;g$  
#include "stdafx.h" M&Ka ^h;N  
#include "hook.h" LVj 1NP  
#include <windowsx.h> 8M,*w6P  
#ifdef _DEBUG eqo0{e  
#define new DEBUG_NEW !eLj + 0  
#undef THIS_FILE ;c(a)_1  
static char THIS_FILE[] = __FILE__; |*&l?S  
#endif {PHH1dC{  
#define MAX_KEY 100 "|SMRc  
#define CTRLBIT 0x04 y_Y(Xx3  
#define ALTBIT 0x02 ?"6Zf LRi  
#define SHIFTBIT 0x01 ,N.8  
#pragma data_seg("shareddata") BU O5g8m{  
HHOOK hHook =NULL; 2ym(fk.6{  
UINT nHookCount =0; Q`ua9oIJ=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ?\}Gi(VVE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT mmAm@/  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey _R4}\3}!  
static int KeyCount =0; 9%!h/m>rW  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7L{1S v  
#pragma data_seg() `ONjEl  
HINSTANCE hins; m>@hh#kBg  
void VerifyWindow(); X z+%Ym  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) *o6}>;  
//{{AFX_MSG_MAP(CHookApp) e~o!Qm  
// NOTE - the ClassWizard will add and remove mapping macros here. AjC:E+g  
// DO NOT EDIT what you see in these blocks of generated code! :t}\%%EbmE  
//}}AFX_MSG_MAP R'Sd'pSDN  
END_MESSAGE_MAP() h)KHc/S  
CdolZW-!"  
CHookApp::CHookApp() SepjF  
{ {%V(Dd[B6  
 // TODO: add construction code here, { i5?R,a)  
 // Place all significant initialization in InitInstance D BT4 W/  
} {ZJO5*  
m|a9T#B(  
CHookApp theApp; =kjKK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >rSjP1-F  
{ bjZJP\6  
 BOOL bProcessed=FALSE; 067c/ c  
 if(HC_ACTION==nCode) z5+Pi:1w  
 { +HK4sA2;  
  if((lParam&0xc0000000)==0xc0000000){// Key up 'solCAy  
   switch(wParam) Q#bW"},^k  
   { ~P4C`Q1PT#  
    case VK_MENU: $*Ucfw1T  
     MaskBits&=~ALTBIT; /F*Y~>*% 1  
     break; S$6|K Y u  
    case VK_CONTROL: ewZ?+G+m  
     MaskBits&=~CTRLBIT; mxa~JAlN_  
     break; ]-=L7a  
    case VK_SHIFT: |.<_$[v[x  
     MaskBits&=~SHIFTBIT; )DSeXS[ e  
     break; (`x_MTLL  
    default: //judge the key and send message fqNh\~kja  
     break; [GwAm>k  
   } pGbfdX  
   for(int index=0;index<MAX_KEY;index++){ i! .]U@{k  
    if(hCallWnd[index]==NULL) DeO-@4+qKd  
     continue; FXQWT9Kk~_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ke4E 1T-1n  
    { LCF}Y{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  j]u!;]  
     bProcessed=TRUE; =C"[o\]VV  
    }  q6 CrUn  
   } pwFp<O"  
  } ewDYu=`*  
  else if((lParam&0xc000ffff)==1){ //Key down &,X}M  
   switch(wParam) mG~_*8}e<  
   { ?w3RqF@}  
    case VK_MENU: =%Y1] F  
     MaskBits|=ALTBIT; YagfCi ?  
     break; k(gbUlCc  
    case VK_CONTROL: K9!HW&?<|  
     MaskBits|=CTRLBIT; })g<I+]Hf9  
     break; ]33!obM  
    case VK_SHIFT: TO wd+]B  
     MaskBits|=SHIFTBIT; %xt9k9=vZ  
     break; "TZq")-  
    default: //judge the key and send message tpfgUZ{  
     break; Z}W{ iD{  
   } --yF%tRMP  
   for(int index=0;index<MAX_KEY;index++) h\s/rZg=r  
   { 2g.lb&3W  
    if(hCallWnd[index]==NULL) ClG%zE&i  
     continue; ]#tB[G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hFtV\xF K  
    { Y },E3<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /K=OsMl2b8  
     bProcessed=TRUE; u4x-GObJM  
    } S{c/3k~  
   } *a9cBl'_  
  } *"%TAe7?~+  
  if(!bProcessed){ bJ d| mm/v  
   for(int index=0;index<MAX_KEY;index++){ =i/Df ?  
    if(hCallWnd[index]==NULL) {)YbksrJ{  
     continue; @rl5k(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J_Lmy7~xbD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7! O"k#  
   } Z,&O8Jelf  
  } TI>5g(:3\  
 } r\NqY.U&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5ggyk0  
} |v&)O)Jg  
Jo?LPR \6  
BOOL InitHotkey() VB |?S|<  
{ %hB-$nE  
 if(hHook!=NULL){ %~rEJB@{  
  nHookCount++; 3CCs_AO  
  return TRUE; Llfl I   
 } \)PB p  
 else E`HoJhB  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); -hd  
  if(hHook!=NULL) L.n@;*  
   nHookCount++; i~@gI5[k+  
  return (hHook!=NULL); ^e:z ul{;]  
} ,K5K?C$k  
BOOL UnInit()  H.5 6  
{ m=l>8  
 if(nHookCount>1){ !:{Qbv&T  
  nHookCount--; wNB?3v{n  
  return TRUE; bz*@[NQ  
 } 'L/)9.29  
 BOOL unhooked = UnhookWindowsHookEx(hHook); U2Ve @.  
 if(unhooked==TRUE){ Vt`4u5HG  
  nHookCount=0; '+Dsmoy  
  hHook=NULL; #S>N}<>  
 } lhUGo =  
 return unhooked; E=NjWO  
} pF;.nt)  
b 74 !Zw  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;-db/$O  
{ U[ ]yN.J  
 BOOL bAdded=FALSE; x]^d'o:cDP  
 for(int index=0;index<MAX_KEY;index++){ /s?%ft#-9o  
  if(hCallWnd[index]==0){ 7@ym:6Y+]  
   hCallWnd[index]=hWnd; \!ZA#7  
   HotKey[index]=cKey; /b+~BvTh  
   HotKeyMask[index]=cMask; 7nt(Rtbsu  
   bAdded=TRUE; I|X`9  
   KeyCount++; `bP`.Wm  
   break; <ZC .9  
  } Kz'GAm\  
 } oj8r*  
 return bAdded; YwVA].p@TI  
} Xo PJ?6 3  
vo/x`F'ib  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pY&6p~\p  
{ g=:o'W$@  
 BOOL bRemoved=FALSE; #2=l\y-#  
 for(int index=0;index<MAX_KEY;index++){ ~WrpJjI[  
  if(hCallWnd[index]==hWnd){ pte\1q[N  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ q <}IO  
    hCallWnd[index]=NULL; h#1:ypA6l  
    HotKey[index]=0; =dXHQU&Q  
    HotKeyMask[index]=0; )nd^@G^  
    bRemoved=TRUE; vJE=H9E  
    KeyCount--; 2/SUEnaLy_  
    break; 2dts}G  
   } mnTF40l  
  } bTs2$81[  
 } HT7,B(.}  
 return bRemoved; 1wgL^Qz@  
} v.ZUYa|  
It*U"4lgi  
void VerifyWindow() Tv%7=P;r  
{ 8)>>EN8 R  
 for(int i=0;i<MAX_KEY;i++){ GcM1*)$ 4  
  if(hCallWnd!=NULL){ :tWk K$  
   if(!IsWindow(hCallWnd)){ PYQ0&;z  
    hCallWnd=NULL; lDS y$  
    HotKey=0; LWrYK i  
    HotKeyMask=0; L7ae6#5.  
    KeyCount--; >s<Bu'r  
   } :7{GOx  
  } %[XP}L$  
 } [3dGHf;miw  
} <Zva  
6 ;'s9s"  
BOOL CHookApp::InitInstance() 8UB2 du@?  
{ 'IU3Xu[-.  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); G}U <^]c  
 hins=AfxGetInstanceHandle(); uQG|r)  
 InitHotkey(); EH".ki=e  
 return CWinApp::InitInstance(); 4m~y%> &  
} x(?Rm,  
E8C8kH]  
int CHookApp::ExitInstance() (XK,g;RoEn  
{ w,hm_aDq  
 VerifyWindow(); ^*jwe^  
 UnInit();  $H*8H`  
 return CWinApp::ExitInstance(); u ?V}pYX  
} @@ j\OR  
\p:)Cdn  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file NG3?OAQTw  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) q,K|1+jn  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ a>C;HO  
#if _MSC_VER > 1000 :@(1~Hm  
#pragma once 6TRLHL~B  
#endif // _MSC_VER > 1000 7a[6@  
p$"~v A .  
class CCaptureDlg : public CDialog !S~)U{SSK  
{ "yymnIQ3u  
 // Construction Q 1i5"'][  
 public: ?C CQm  
  BOOL bTray; cO:lpsKYQ  
  BOOL bRegistered; ;9~YQW@|  
  BOOL RegisterHotkey(); IAA_Ft  
  UCHAR cKey; F]RPM(!5O)  
  UCHAR cMask; tk0m[HN@eV  
  void DeleteIcon(); >QDyG8*  
  void AddIcon(); Ztk%uc8_lM  
  UINT nCount; 23|JgKuA  
  void SaveBmp(); L1_O!EQ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor aj|3(2;Kp  
  // Dialog Data ll}_EUF|  
  //{{AFX_DATA(CCaptureDlg) 5]mH.{$x$?  
  enum { IDD = IDD_CAPTURE_DIALOG }; e@c8Ce|0  
  CComboBox m_Key; $c*fbBM(&n  
  BOOL m_bControl; O:v#M]   
  BOOL m_bAlt; 7(5d$W  
  BOOL m_bShift; ]prw=rD  
  CString m_Path; E2l" e?AN~  
  CString m_Number; WiH8j$;xu  
  //}}AFX_DATA y%|Ez  
  // ClassWizard generated virtual function overrides aP(~l_  
  //{{AFX_VIRTUAL(CCaptureDlg) \[!{tbK`2  
 public: >07i"a  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !UT!PX)  
 protected: 2V 8 "jc  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y"ta`+ VJ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `pv  
  //}}AFX_VIRTUAL Dj= {%  
  // Implementation : xg J2  
 protected: ;\"5)S  
  HICON m_hIcon; 5%wA"_  
  // Generated message map functions 9t`yv@.>N  
  //{{AFX_MSG(CCaptureDlg) ty[%:eG#  
  virtual BOOL OnInitDialog(); Ud"_[JtGM  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); .NWsr*Tel  
  afx_msg void OnPaint(); A46dtFD{  
  afx_msg HCURSOR OnQueryDragIcon(); CUB;0J(  
  virtual void OnCancel(); 5> dA7j^v  
  afx_msg void OnAbout(); PL"=>  
  afx_msg void OnBrowse(); bv41et+Kb  
  afx_msg void OnChange(); 9~^k3!>0  
 //}}AFX_MSG _R0O9sPTO  
 DECLARE_MESSAGE_MAP() nls$ wE  
}; *QNX?8Fm_  
#endif .`*;AT  
`C7pM  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wBlE!Pm  
#include "stdafx.h" t .&JPTK-H  
#include "Capture.h" 4iSN.nxIZ  
#include "CaptureDlg.h" EqHToD I3  
#include <windowsx.h> Ag3+z+uS  
#pragma comment(lib,"hook.lib") W rT_7  
#ifdef _DEBUG alxIc.[  
#define new DEBUG_NEW '"q+[zwv  
#undef THIS_FILE f:nXE&X[  
static char THIS_FILE[] = __FILE__; UQhD8Z'I.  
#endif b4$g$()  
#define IDM_SHELL WM_USER+1 1A93ol=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %/)z!}{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1z; !)pG.  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};  Z a,o  
class CAboutDlg : public CDialog |-v/  
{ 3p-SpUvp  
 public: .: wg@Z  
  CAboutDlg(); rD6NUS  
  // Dialog Data ]=3hH+1 a  
  //{{AFX_DATA(CAboutDlg) <`q-#-V@  
  enum { IDD = IDD_ABOUTBOX }; w3iX "w  
  //}}AFX_DATA n\7 >_  
  // ClassWizard generated virtual function overrides Z3<lJk\Y  
  //{{AFX_VIRTUAL(CAboutDlg) W-D4" G@  
 protected: X+;#^A3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support aR)UHxvX  
  //}}AFX_VIRTUAL M~X~2`fFH  
  // Implementation l"&iSq!3=  
 protected: W`[7|8(6!  
  //{{AFX_MSG(CAboutDlg) $Q|6W &?[;  
  //}}AFX_MSG H>\l E2  
  DECLARE_MESSAGE_MAP() }If,O  
}; $/u.F;  
)+)qFGVz  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #p{8  
{ i*xVD`x~  
 //{{AFX_DATA_INIT(CAboutDlg) !!6@r|.  
 //}}AFX_DATA_INIT `^g-2~  
} 0p,_?3nX  
J,h'eY5  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5OTZa>H  
{ %h_N%B$7c1  
 CDialog::DoDataExchange(pDX); D1]?f`  
 //{{AFX_DATA_MAP(CAboutDlg) I_c?Ky8J_|  
 //}}AFX_DATA_MAP {6}$XLV3l  
} (-o}'l'mo  
wO%617Av  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v&])D/a  
 //{{AFX_MSG_MAP(CAboutDlg) '\pSUp  
 // No message handlers 1[Q~&QC  
 //}}AFX_MSG_MAP 3;//o<  
END_MESSAGE_MAP() AAi4} 8+\  
gxDyCL$h3  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 9)F$){G]vs  
: CDialog(CCaptureDlg::IDD, pParent) b^~4k; <  
{ p%Ns f[1>  
 //{{AFX_DATA_INIT(CCaptureDlg) wLq#,X>%B  
  m_bControl = FALSE; >'3nsR  
  m_bAlt = FALSE; x` 4|^ u  
  m_bShift = FALSE; 4{$ L]toP  
  m_Path = _T("c:\\"); }y|_v^  
  m_Number = _T("0 picture captured."); 1LmbXH]%  
  nCount=0; Z'wGZ(  
  bRegistered=FALSE; -ADb5-px  
  bTray=FALSE; C;Kq_/l  
 //}}AFX_DATA_INIT "NV~lJS%  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 f1\mE~#}  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Mf9x=K9  
} w!UIz[ajI  
pSx}:u^am  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |UQGZ  
{ Fp+fZU  
 CDialog::DoDataExchange(pDX); On;7  
 //{{AFX_DATA_MAP(CCaptureDlg) 9]S;%:64  
  DDX_Control(pDX, IDC_KEY, m_Key); 8[)"+IFN  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 9*a"^  
  DDX_Check(pDX, IDC_ALT, m_bAlt); oC TSV  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); LD;! s  
  DDX_Text(pDX, IDC_PATH, m_Path); 7U)w\A;~  
  DDX_Text(pDX, IDC_NUMBER, m_Number); gp\o|igT  
 //}}AFX_DATA_MAP %pxHGO=)E  
} aqP"Y9l  
;3 =RM\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ()_^:WQO?  
//{{AFX_MSG_MAP(CCaptureDlg) xn<x/e  
 ON_WM_SYSCOMMAND() w\>@> *E>  
 ON_WM_PAINT() T#YJ5Xw  
 ON_WM_QUERYDRAGICON() wem hP8!gc  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) dsZ-|C  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) KctbNMU]k  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 2 o5u02x  
//}}AFX_MSG_MAP z7JhS|  
END_MESSAGE_MAP() x c?=fv  
`! )^g/>0i  
BOOL CCaptureDlg::OnInitDialog() .|LY /q\A  
{ ,/-DAo~O  
 CDialog::OnInitDialog(); c*V/2" 5  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 239g pf]}  
 ASSERT(IDM_ABOUTBOX < 0xF000); d?[8VfAnh  
 CMenu* pSysMenu = GetSystemMenu(FALSE); )%I62<N,z  
 if (pSysMenu != NULL) Ye\ &_w"  
 { \2 [  
  CString strAboutMenu; qD(dAU  
  strAboutMenu.LoadString(IDS_ABOUTBOX); KhNE_. Z  
  if (!strAboutMenu.IsEmpty()) =nUzBL%~  
  { ;+~Phdy  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5Noy~;  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 'DB'lP  
  } RAoY`AWI  
 } q:P44`Aq  
 SetIcon(m_hIcon, TRUE); // Set big icon rVb61$  
 SetIcon(m_hIcon, FALSE); // Set small icon }ho6  
 m_Key.SetCurSel(0); ]L!:/k,=S  
 RegisterHotkey(); q!) nSD  
 CMenu* pMenu=GetSystemMenu(FALSE); A{wSO./3  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 5eX+9niY  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7;ddzxR4  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `_.(qg   
 return TRUE; // return TRUE unless you set the focus to a control ej]>*n  
} 'Fa~l'G7X  
cx+%lco!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) TxmKmZ u  
{ RxGZ#!j/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) s,8g^aF4  
 { SuJ4)f;'0  
  CAboutDlg dlgAbout; 8^qLGUxz  
  dlgAbout.DoModal(); Dp;6CGYl?  
 } oN.#q$\` k  
 else RA:3ZV  
 { e8hwXz  
  CDialog::OnSysCommand(nID, lParam); >^adxXw.o  
 } 9y*pn|A[F  
} cG4$)q;q  
BA`K,#Ft7  
void CCaptureDlg::OnPaint() 2]_fNCNLN  
{ 6V @ [< d  
 if (IsIconic()) d6g^>}-!t  
 { WTj,9  
  CPaintDC dc(this); // device context for painting Si=u=FI1e  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); iR{*X E   
  // Center icon in client rectangle MY z\ R \  
  int cxIcon = GetSystemMetrics(SM_CXICON); x4/f5  
  int cyIcon = GetSystemMetrics(SM_CYICON); \`|OAC0a  
  CRect rect; B&z~}lL  
  GetClientRect(&rect); e-YMFJtoK}  
  int x = (rect.Width() - cxIcon + 1) / 2; a*{ -r]  
  int y = (rect.Height() - cyIcon + 1) / 2; XjJ[7"hs*  
  // Draw the icon z 5IdYF?  
  dc.DrawIcon(x, y, m_hIcon); c~n:xblv  
 } <):= mr7  
 else ; Ne|H$N  
 { j%Z%_{6Ds*  
  CDialog::OnPaint(); S!.H _=z%p  
 } <izn B8@  
} oz?pE[[tm  
W< :7z  
HCURSOR CCaptureDlg::OnQueryDragIcon() 4w(#`'I>  
{ 8Rd*`]@[pk  
 return (HCURSOR) m_hIcon; [UYE.$Y#(  
} PG'+vl  
kTS #>uS  
void CCaptureDlg::OnCancel() ~cW,B}  
{ hD>cxo  
 if(bTray) E9v_6d[  
  DeleteIcon(); >vc$3%L[$  
  CDialog::OnCancel(); VK]sK e  
} s92SN F}g  
2sahb#e )  
void CCaptureDlg::OnAbout() .L))EB  
{ 9\a;75a  
 CAboutDlg dlg; "tg?V  
 dlg.DoModal(); ^n<o,K4\}  
} T8-,t];i  
TCetd#;R  
void CCaptureDlg::OnBrowse() #'oGtFCd`  
{ H 5'Ke+4.e  
 CString str; 6@geakq  
 BROWSEINFO bi; K_ [B@( Xl  
 char name[MAX_PATH]; 5!iBKOl#D  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); a X:,1^  
 bi.hwndOwner=GetSafeHwnd(); /nVGr]t_pj  
 bi.pszDisplayName=name; |lVoL.Z,0  
 bi.lpszTitle="Select folder"; rnS&^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; VL| q`n  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); - DE?L,9X9  
 if(idl==NULL) Kz2s{y~?  
  return; h][$1b&B  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <~R{U> zO  
 str.ReleaseBuffer(); 0iTh |K0  
 m_Path=str; qfl#ki`,  
 if(str.GetAt(str.GetLength()-1)!='\\') `w#p8vR  
  m_Path+="\\"; 31k2X81;a  
 UpdateData(FALSE); oVja$;>  
} y8CH=U[  
[X\~J &kD  
void CCaptureDlg::SaveBmp() O#B2XoZa+  
{ OCN@P+L3q  
 CDC dc; wJu,N(U  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); vC>8:3Z aq  
 CBitmap bm; eeu;A, @U  
 int Width=GetSystemMetrics(SM_CXSCREEN); aXRf6:\%  
 int Height=GetSystemMetrics(SM_CYSCREEN); $I:&5o i  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Y>To k|PV  
 CDC tdc; o=y0=,:a?9  
 tdc.CreateCompatibleDC(&dc); _"688u'88  
 CBitmap*pOld=tdc.SelectObject(&bm); vOi4$I~CJ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "6 \_/l  
 tdc.SelectObject(pOld); z"j]m_m H  
 BITMAP btm; F<LRo}j"9Q  
 bm.GetBitmap(&btm); *^Xtorqo  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; xmBGZ4f%  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); B4 +A  
 BITMAPINFOHEADER bih; U)iq  
 bih.biBitCount=btm.bmBitsPixel; ^QTtCt^:  
 bih.biClrImportant=0; TIYo&?Z)  
 bih.biClrUsed=0; jltW@co2sV  
 bih.biCompression=0; Y;[+^J*a  
 bih.biHeight=btm.bmHeight; o2e gNTG  
 bih.biPlanes=1; b_rHt s  
 bih.biSize=sizeof(BITMAPINFOHEADER); v2;' F  
 bih.biSizeImage=size; :XaBCF*  
 bih.biWidth=btm.bmWidth; |h* rkLY  
 bih.biXPelsPerMeter=0; b[os0D95  
 bih.biYPelsPerMeter=0; c%vtg.A  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); n,8bQP=&  
 static int filecount=0; XAw0Nn   
 CString name; xmNs<mz  
 name.Format("pict%04d.bmp",filecount++); lmpBf{~ S  
 name=m_Path+name; 9HBRWh6  
 BITMAPFILEHEADER bfh; $ v0beN6MG  
 bfh.bfReserved1=bfh.bfReserved2=0; HGl.dO 7NU  
 bfh.bfType=((WORD)('M'<< 8)|'B'); &$8YW]1M  
 bfh.bfSize=54+size; ~zph,bk  
 bfh.bfOffBits=54; o GN*p_g  
 CFile bf; m*H' Cb  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ l7vxTj@(-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); tiQeON-Q_  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); QP:|D_k  
  bf.WriteHuge(lpData,size); W}aCU~  
  bf.Close(); "`Mowp*  
  nCount++; > xie+ ^  
 } ~x6<A\  
 GlobalFreePtr(lpData); "#G`F  
 if(nCount==1) -cP7`.a  
  m_Number.Format("%d picture captured.",nCount); (,OF<<OH  
 else 3+oGR5gIN  
  m_Number.Format("%d pictures captured.",nCount); \k>1q/T0V  
  UpdateData(FALSE); ;\(X;kQi  
} Td,s"p>Vq  
iWp 6^g  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) i$JN s)I%  
{ X(JE]6_  
 if(pMsg -> message == WM_KEYDOWN) <tto8Y j  
 { N977F$B o  
  if(pMsg -> wParam == VK_ESCAPE) "xV0$%  
   return TRUE; 8Ai\T_l  
  if(pMsg -> wParam == VK_RETURN) 7-A/2/G<  
   return TRUE; nR`)kORc  
 } >vKOG@I  
 return CDialog::PreTranslateMessage(pMsg); #b wGDF  
} #$ooV1E  
HvLx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) A5?q&VS}p  
{ 2wwJ>iR`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ O 8XHaVLg3  
  SaveBmp(); CRs@x` 5ue  
  return FALSE; l?)!^}Qc  
} @RXkj-,eC#  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ J^y?nE(j  
 CMenu pop; Ge1b_?L_  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); EFn[[<&><t  
 CMenu*pMenu=pop.GetSubMenu(0); yZQcxg%  
 pMenu->SetDefaultItem(ID_EXITICON); rt'pc\|O&  
 CPoint pt; ;b_l/T(  
 GetCursorPos(&pt); %00cC~}4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); SZ1yy["  
 if(id==ID_EXITICON) apZPHau6h  
  DeleteIcon(); J#xZ.6)  
 else if(id==ID_EXIT) u~7fK  
  OnCancel(); 'Y0h w  
 return FALSE; DR7JEE  
} o[)*Y`xq<w  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0Ua&_D"  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Zm*qV!  
 AddIcon(); @Yn+ir0>O  
 return res; U^8S@#1Q  
} 6bN8}\5  
Ey=ymf.}  
void CCaptureDlg::AddIcon() i>O8q%BnJ  
{ 8]D0)  
 NOTIFYICONDATA data; >&ENrvaJ  
 data.cbSize=sizeof(NOTIFYICONDATA); -&l%CR,U  
 CString tip; u|LDN*#DW  
 tip.LoadString(IDS_ICONTIP); r @}N6U~*  
 data.hIcon=GetIcon(0); _L+j6N.h1  
 data.hWnd=GetSafeHwnd(); $0k7W?tu  
 strcpy(data.szTip,tip); u+^KP>rM(  
 data.uCallbackMessage=IDM_SHELL; ?dPr HSy  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; mLx=Zes:.  
 data.uID=98; Q5lt[2Zyzd  
 Shell_NotifyIcon(NIM_ADD,&data); 4n"6<cO5q  
 ShowWindow(SW_HIDE); (&Rql7](8  
 bTray=TRUE; ] n\]ao  
} /24}>oAH  
rp+]f\] h  
void CCaptureDlg::DeleteIcon() @lWYc`>}  
{ *d`KD64  
 NOTIFYICONDATA data; 1nw\?r2  
 data.cbSize=sizeof(NOTIFYICONDATA); y)"rh/;  
 data.hWnd=GetSafeHwnd(); <<b]v I  
 data.uID=98; UVXSW*$  
 Shell_NotifyIcon(NIM_DELETE,&data); S*gm[ZLQ  
 ShowWindow(SW_SHOW); YmpaLZJ  
 SetForegroundWindow(); ':3[?d1Es  
 ShowWindow(SW_SHOWNORMAL); *nYg-)  
 bTray=FALSE; cUr!U\X[  
}  i CLH  
Z~<=I }@  
void CCaptureDlg::OnChange() :%Oz:YxC/  
{ ,`02fMOLc  
 RegisterHotkey(); I$MlIz$l v  
} Eh)VT{vp  
=H3tkMoi2  
BOOL CCaptureDlg::RegisterHotkey() #4JLWg  
{ {o 2 qY|S  
 UpdateData(); ]-9w'K d  
 UCHAR mask=0; |j81?4<)v  
 UCHAR key=0; MB7*AA;  
 if(m_bControl) -Lu&bVt<>  
  mask|=4; R}cNhZC  
 if(m_bAlt) D6H?*4f]  
  mask|=2; $8xb|S[  
 if(m_bShift) p_(En4QSH  
  mask|=1; rlGv6)vb  
  key=Key_Table[m_Key.GetCurSel()]; -7]j[{?w  
 if(bRegistered){ Y SB=n d_  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); d^J)Mhju  
  bRegistered=FALSE; PZ`11#bbm  
 } zj(V\y&H  
 cMask=mask; g8l6bh$}  
 cKey=key; H%XF~tF:  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); l? U!rFRq`  
 return bRegistered; E3l*_b0  
} " :vEWp+g  
7RWgc]@?>  
  四、小结 El@*Fo  
Gw\..O  
  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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