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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: -1@kt<Es  
  'rSM6j  
  一、实现方法 J[^-k!9M  
3o1j l2n  
  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: !$O +M#  
5!wa\)wY  
#pragma data_seg("shareddata") 1PWDK1GI8  
HHOOK hHook =NULL; //钩子句柄 Z*k}I{0,-  
UINT nHookCount =0; //挂接的程序数目 F: \CDM=lS  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 #jnb6v=5v  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 cc@y  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey TG!sck4/-Q  
static int KeyCount =0; LE Y$St  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 |'Jz(dv[  
#pragma data_seg() Er{yQIi0L  
\KTX{qI"f  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 oR5'g7?  
(*#S%4(YX  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: # TvY*D,  
?@tp1?)  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR V-VR+Ndz  
cKey,UCHAR cMask) QqRL>.)W  
{ &L_(yJ~-  
 BOOL bAdded=FALSE; gg<lWeS/3  
 for(int index=0;index<MAX_KEY;index++){ w'}b 8m(L  
  if(hCallWnd[index]==0){ Nkc=@l {  
   hCallWnd[index]=hWnd; /WfpA\4S  
   HotKey[index]=cKey; 0;)4.*t  
   HotKeyMask[index]=cMask; 1;>J9  
   bAdded=TRUE; sVGyHA  
   KeyCount++; d^ w6_  
   break; Ug/b;( dJ'  
  } qg|SBQ?6  
 } ]c*&5c$  
 return bAdded; Z[ys>\_To  
} :X+7}!Wlo  
//删除热键 &)1+WrU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KZ&{Ya  
{ @<h@d_8^k  
 BOOL bRemoved=FALSE; H>2)R 7h  
 for(int index=0;index<MAX_KEY;index++){   \\6/"  
  if(hCallWnd[index]==hWnd){ PKmr5FB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Y\s@'UoVN  
    hCallWnd[index]=NULL; <&B)i\j8=b  
    HotKey[index]=0; G/b $cO}  
    HotKeyMask[index]=0; ,|D<De\v&  
    bRemoved=TRUE; '?4B0=  
    KeyCount--; "HlT-0F  
    break; a8NL  
   } L~>pSP^a  
  } | X! d*4  
 } ]e!9{\X,*  
 return bRemoved; 4/cUd=>Z  
} 6,| !zaeS  
yoQ}m/Cj  
&iez{[O  
  DLL中的钩子函数如下: %qNT<>c  
Db@$'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) kyMWO*>|  
{ \s<L2uRj  
 BOOL bProcessed=FALSE; T=%,^  
 if(HC_ACTION==nCode) eqV;4dhm  
 { Y$ ZZ0m  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 4~4D1  
   switch(wParam) x= X"4Mj0)  
   {  (/JiOg^cw  
    case VK_MENU: uS;N&6;:  
     MaskBits&=~ALTBIT; M $ CnaH  
     break; zr2oU '+  
    case VK_CONTROL: yC pU1 73V  
     MaskBits&=~CTRLBIT; ,Tjc\;~%  
     break; DJR_"8  
    case VK_SHIFT: "=@X>jUc  
     MaskBits&=~SHIFTBIT; O!#r2Y"?K1  
     break; '| WY 2>/(  
    default: //judge the key and send message ;Lr]w8d  
     break; B^nE^"b  
   } *d b,N'rK  
   for(int index=0;index<MAX_KEY;index++){ fgdqp8~  
    if(hCallWnd[index]==NULL) 5Sl vCL  
     continue; BS!VAHO"V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \xR1|M  
    { /6QwV->  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *> LA30R*v  
     bProcessed=TRUE; ;LD!eWSK,  
    } $bOiP  
   } B)*?H=f/  
  } B:;$5PUTc  
  else if((lParam&0xc000ffff)==1){ //有键按下 (l}W\iB' d  
   switch(wParam) '*lVVeSiFw  
   { #TS:| =  
    case VK_MENU: ,v,#f .  
     MaskBits|=ALTBIT; Qh3BI?GZ'3  
     break; }LeizbU  
    case VK_CONTROL: u0p[ltJ,  
     MaskBits|=CTRLBIT; Ce_k&[AJF  
     break; _Oc5g5_{  
    case VK_SHIFT: KDxqz$14 -  
     MaskBits|=SHIFTBIT; ?h\fwF3  
     break; mBN+c9n/  
    default: //judge the key and send message =S#9\W&6Q  
     break; 9?]69O  
   } %^Zu^uu   
   for(int index=0;index<MAX_KEY;index++){ $\Oc]%  
    if(hCallWnd[index]==NULL) RqB 8g  
     continue; A{|^_1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 17la/7l<  
    { /F@CrNFb(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4 '"C8vw.  
     bProcessed=TRUE; (P'{A>aHl0  
    } Ui|z#{8&  
   } }ff+RGxLIG  
  } A1g.ww:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 O pavno%&  
   for(int index=0;index<MAX_KEY;index++){ ? `hA:X<  
    if(hCallWnd[index]==NULL) M47t(9krV  
     continue; Zo`_vx/{j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]sLdz^E3D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); P_}wjz}9ZX  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 w#}[=jy  
   } uo`zAKM&A  
  } 6({TG&`!]  
 } i/|}#yw8A  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !{q_Q !  
} n,D&pl9f  
g^I?u$&E  
  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~Z;S QyN  
\?tE,\Ln  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cY]BtJ#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u4x>gRz)  
Q%r KKOX8  
  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: WYJH+"@%j  
F ~SA3M:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L%;fYi;n  
{ QZ& 4W  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) WA((>Daf]  
 { z94#:jPmG  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $:|?z_@  
  SaveBmp(); fDjJdRS"  
  return FALSE; swKqsN.  
 } r(j:C%?}C  
 …… //其它处理及默认处理 ;W{2\ Es  
} +?)R}\\  
#(7^V y&  
<c%  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 <P~pn!F}  
vN&(__3((  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ;oCSKY4  
|_njN  
  二、编程步骤 #$X _,+<HZ  
uA4x xY  
  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"; muAgsH$/  
=O%'qUj`q  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; BEtFFi6ot  
@.)WS\Cv#E  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 0oQJ}8t  
',Y`\X  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; nc3u sq  
8 qlQC.VA[  
  5、 添加代码,编译运行程序。 y!8m7a  
E(F?o.b  
三、程序代码 |@5G\N-  
`*WzHDv5p  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ^P|Zze zwU  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) } _=h]|6t  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #(}'G*  
#if _MSC_VER > 1000  oP~%7Jt  
#pragma once 5[LDG/{Tys  
#endif // _MSC_VER > 1000 BdB9M8fM  
#ifndef __AFXWIN_H__ LNcoTdv}k  
#error include 'stdafx.h' before including this file for PCH =%SH2kb  
#endif {4{X`$  
#include "resource.h" // main symbols vM?,#:5  
class CHookApp : public CWinApp $px1D$F!  
{ _Un*x5u2O  
 public: 1}R\L"  
  CHookApp(); CC)Mws+2  
  // Overrides {>UT'fa-  
  // ClassWizard generated virtual function overrides 3/y"kl:< -  
  //{{AFX_VIRTUAL(CHookApp) h<G7ocu!  
 public: ; GEr8_7  
  virtual BOOL InitInstance(); h t3P@;  
  virtual int ExitInstance(); =6a=`3r!I  
  //}}AFX_VIRTUAL !t[;~`d9  
  //{{AFX_MSG(CHookApp) qND:LP\_v  
  // NOTE - the ClassWizard will add and remove member functions here. SohNk9u[8  
  // DO NOT EDIT what you see in these blocks of generated code ! e(I;[G +%,  
  //}}AFX_MSG </pt($  
  DECLARE_MESSAGE_MAP() N :OLN[  
};  Q!5W x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); uuQsK. S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 97dF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =)}Yw)  
BOOL InitHotkey(); j-d542"  
BOOL UnInit(); woa|h"T  
#endif z))rk vL%  
N)/7j7c~;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. c*r@QmB:  
#include "stdafx.h" 9a#Y D;-p  
#include "hook.h" F. I\?b  
#include <windowsx.h> EMPujik-  
#ifdef _DEBUG FqZD'Uu7  
#define new DEBUG_NEW v6H!.0  
#undef THIS_FILE BoXPX2:  
static char THIS_FILE[] = __FILE__; =zR9^k  
#endif Yyw9IYB;  
#define MAX_KEY 100 _hgGF9  
#define CTRLBIT 0x04 ydMhb367|  
#define ALTBIT 0x02 HQSFl=Q  
#define SHIFTBIT 0x01 \*M;W|8aB  
#pragma data_seg("shareddata") ^fV-m&F)K*  
HHOOK hHook =NULL; \E6 0  
UINT nHookCount =0; `_sKR,LhB  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey XqGa]/;}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT I+QM":2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #r,!-;^'p  
static int KeyCount =0; E5?$=cL?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift r`$P60,@C  
#pragma data_seg() e5D\m g)  
HINSTANCE hins; Wngc(+6O&  
void VerifyWindow(); p0D@O_ :5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8@ S@^C*F  
//{{AFX_MSG_MAP(CHookApp) y7,t "XV  
// NOTE - the ClassWizard will add and remove mapping macros here. L#WGOl  
// DO NOT EDIT what you see in these blocks of generated code! 3lbGG42:  
//}}AFX_MSG_MAP <E:_9#Z0sc  
END_MESSAGE_MAP() R[kF(C&  
&UVqF o  
CHookApp::CHookApp() _$/Bt?h  
{ zDBm^ s  
 // TODO: add construction code here, %!DTq`F  
 // Place all significant initialization in InitInstance i*8j|  
} l3+G]C&<  
3sgo5D-rMI  
CHookApp theApp; /z(d!0_q|v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Jpy~5kS  
{ pq%inSY  
 BOOL bProcessed=FALSE; ol~ tfS  
 if(HC_ACTION==nCode) Y-,S_59  
 { :QF`Orb!^  
  if((lParam&0xc0000000)==0xc0000000){// Key up KpIY>k  
   switch(wParam) ,."wxP2u  
   { !^EA}N.u  
    case VK_MENU: w]fVELU  
     MaskBits&=~ALTBIT; %.wx]:o  
     break; B 74  
    case VK_CONTROL: %q.5; L  
     MaskBits&=~CTRLBIT; |[p]]) o  
     break; A8k $.E  
    case VK_SHIFT: k@pEs# a  
     MaskBits&=~SHIFTBIT; G *<g%"  
     break; T+S\'f\  
    default: //judge the key and send message RB6TM  
     break; A"0Yn(awWu  
   } UGvUU<N|N  
   for(int index=0;index<MAX_KEY;index++){ ,Xg^rV~]  
    if(hCallWnd[index]==NULL) (,|eE)+  
     continue; Bc`L ]<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a '?LC)^  
    { UR(i_T&w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); t0za%q!fK<  
     bProcessed=TRUE; <dAxB$16sT  
    } 7+Nl)d:C J  
   } EWq < B)  
  } wKoar  
  else if((lParam&0xc000ffff)==1){ //Key down 6B Hd c  
   switch(wParam) 6W~JM^F  
   { X5-[v(/]  
    case VK_MENU: BqpJvRJd  
     MaskBits|=ALTBIT; L=.@hs  
     break; 6G(K8Q{>  
    case VK_CONTROL: .yHK  
     MaskBits|=CTRLBIT; FbH@qHSH  
     break; [q/eRIS_  
    case VK_SHIFT: f(\S +4  
     MaskBits|=SHIFTBIT; C+_UI x]A  
     break; ?0-3J )kW  
    default: //judge the key and send message `=Rxnl,<U  
     break; r9<#R=r)}J  
   } !| q19$  
   for(int index=0;index<MAX_KEY;index++) r oBb o  
   { } Fli  
    if(hCallWnd[index]==NULL) s#aane  
     continue; #TV #*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o=PW)37>  
    { AG#Mj(az!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1;!dTh  
     bProcessed=TRUE; 4QYStDFe  
    } vbtjPse  
   } eT?vZH[N  
  } sQ&<cBs2  
  if(!bProcessed){ C0khG9,BL  
   for(int index=0;index<MAX_KEY;index++){ 7W+{U0 2O  
    if(hCallWnd[index]==NULL) :G=ol2Q  
     continue; ) r"7"i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W}|k!_/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Hq&MePl[  
   } BAG#YZB  
  } nITkgN:s  
 } |x=(}g  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %|ioNXMu  
} UMMGT6s,E8  
IR&b2FTcU  
BOOL InitHotkey() n\$.6 _@x  
{ L+mHeS l  
 if(hHook!=NULL){ #KuBEHr  
  nHookCount++; H`yUSB IP  
  return TRUE; T hVq5  
 } &V%faa1  
 else z uo:yaO  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  B`vC>  
  if(hHook!=NULL) @PK 1  
   nHookCount++; 3ly ]DTbz  
  return (hHook!=NULL); >u|4490<0  
} Gz--C(  
BOOL UnInit() 0d89>UB-8q  
{ |Qpd<L  
 if(nHookCount>1){ g6$\i m  
  nHookCount--; _s:5)  
  return TRUE; hVCxwTg^X  
 } e?\hz\^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); rKTc 6h:)  
 if(unhooked==TRUE){ y>cT{)E$  
  nHookCount=0; -vh\XO  
  hHook=NULL; B->oTC`5  
 } ]<9o>#3  
 return unhooked; <"S`ZOn  
} j9}.U \  
BFqM6_/J  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H2+V1J=  
{ -k%|sqDZj  
 BOOL bAdded=FALSE; _^$F^}{&  
 for(int index=0;index<MAX_KEY;index++){ ~| oB|>  
  if(hCallWnd[index]==0){ zs'Jgm.v  
   hCallWnd[index]=hWnd; H1 i+j;RN  
   HotKey[index]=cKey; Y~I0\8s-  
   HotKeyMask[index]=cMask; cet|k!   
   bAdded=TRUE; d_ &~^*>  
   KeyCount++; Gsy90  
   break; $dKo}  
  } gEmsPk,  
 } gRw? <U^  
 return bAdded; #wGOlW;R  
} ']H*f2y  
+JB*1dz>8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Wi*HLP!lNC  
{ 2Y;iqR  
 BOOL bRemoved=FALSE; a!&m\+?  
 for(int index=0;index<MAX_KEY;index++){ &$h#9  
  if(hCallWnd[index]==hWnd){ dd@ D s  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ vtzbF1?O  
    hCallWnd[index]=NULL; 3=0b  
    HotKey[index]=0; b8 6c[2  
    HotKeyMask[index]=0; Ng*O/g`%L  
    bRemoved=TRUE; xo(>nFjo  
    KeyCount--; WpkCFp  
    break; Hx9lQ8  
   } @[5]?8\o  
  } /1hcw|cfC  
 } E< pO!P  
 return bRemoved; *N](Xtbj  
} Xa$tW%)  
Pb7-pu5 X  
void VerifyWindow() 5X^`qUSv  
{ J$(79gH{  
 for(int i=0;i<MAX_KEY;i++){ yQFZRDV~  
  if(hCallWnd!=NULL){ 461p4)  
   if(!IsWindow(hCallWnd)){ ?zYR;r2'b)  
    hCallWnd=NULL; 1V]j8  
    HotKey=0; 9 vNz yh\  
    HotKeyMask=0; o<g1;  
    KeyCount--; Wa iM\h?=#  
   } ciN*gwI)  
  } cejD(!MKe  
 } "Fxw"I <  
} p(yHB([8  
G.^^zmsM`  
BOOL CHookApp::InitInstance() T1RICIf 1F  
{ Mu_'C$zA  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); bGi k~  
 hins=AfxGetInstanceHandle(); .0dx@Sbv  
 InitHotkey(); Wf&i{3z[  
 return CWinApp::InitInstance(); Fn;Gq-^7@  
} W)`H(J  
jVSU]LU E  
int CHookApp::ExitInstance() V)mi1H|m  
{ T 0?9F2  
 VerifyWindow(); (V`ddP-  
 UnInit(); ~b 9fk)z!  
 return CWinApp::ExitInstance(); .zJZ*\2ob  
} WwLV^m]  
&Z+.FTo  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file NDG?X s [2  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) "ZG2olOqLI  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [t]q#+Zs  
#if _MSC_VER > 1000 n%{oFTLCo  
#pragma once Z}>+!Z  
#endif // _MSC_VER > 1000 )2b bG4:N  
s~I#K[[5  
class CCaptureDlg : public CDialog VWMr\]g  
{ VS+5{w:t  
 // Construction *C(q{|f  
 public: N&W7g#F  
  BOOL bTray; "I3&a1*  
  BOOL bRegistered; V&d?4i4/Q  
  BOOL RegisterHotkey(); Rm@F9D[,  
  UCHAR cKey; FNXVd/{M3  
  UCHAR cMask; pF:C   
  void DeleteIcon(); (9+N_dLx~P  
  void AddIcon(); r6e!";w:U  
  UINT nCount; ZRC7j?ui8`  
  void SaveBmp(); 4Gsq)i17j  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor S{~j5tQv^q  
  // Dialog Data lp5 b&I_  
  //{{AFX_DATA(CCaptureDlg) ,fyqa  
  enum { IDD = IDD_CAPTURE_DIALOG }; sV`XJ9e|  
  CComboBox m_Key; Aoy=gK  
  BOOL m_bControl; zi,":KDz#  
  BOOL m_bAlt; qjIcRue'"  
  BOOL m_bShift; o q cu<]  
  CString m_Path; ?$4CgN-  
  CString m_Number; \6,Z<.I  
  //}}AFX_DATA ypY7uYO^"  
  // ClassWizard generated virtual function overrides %? z;'Y7D  
  //{{AFX_VIRTUAL(CCaptureDlg) fXAD~7T*s  
 public: HjX)5@"o(  
  virtual BOOL PreTranslateMessage(MSG* pMsg); * Vymb  
 protected: &- ZRS/_d>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C] |m|`  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $)7Af6xD  
  //}}AFX_VIRTUAL 2spK#0n.HV  
  // Implementation CfHPJ: Qo[  
 protected: 'h{DjNSM  
  HICON m_hIcon; _B\X&!G.  
  // Generated message map functions #M8>)oc  
  //{{AFX_MSG(CCaptureDlg) Jl89}Sf  
  virtual BOOL OnInitDialog(); &3Mps[u:h  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); &sS]h|2Z5  
  afx_msg void OnPaint(); aGmbB7[BZ  
  afx_msg HCURSOR OnQueryDragIcon(); Wr.~Ns <  
  virtual void OnCancel(); rXnG"A  
  afx_msg void OnAbout(); GC~N$!*  
  afx_msg void OnBrowse(); +Z%8X!Q  
  afx_msg void OnChange(); t Ow[  
 //}}AFX_MSG b/eo]Id]  
 DECLARE_MESSAGE_MAP() Jv:|J DZ'  
}; t($z+ C<  
#endif 9!Vp-bo  
b]\V~ZaXG  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~Nl`Zmn(A|  
#include "stdafx.h" aB4L$M8x  
#include "Capture.h" @#| R{5=+  
#include "CaptureDlg.h" QK`2^  
#include <windowsx.h> "4i_}  
#pragma comment(lib,"hook.lib") (OHd} YQ  
#ifdef _DEBUG n`7n5M*  
#define new DEBUG_NEW ,NQ>,}a0  
#undef THIS_FILE /M~rmIks  
static char THIS_FILE[] = __FILE__; p2o6 6t  
#endif IR*:i{  
#define IDM_SHELL WM_USER+1 xqaw00,s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hin6cac  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OTwXc*2u]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; I,!>ZG@6  
class CAboutDlg : public CDialog wGA%h.[M|  
{ 1z=}`,?>  
 public: WFFpW{  
  CAboutDlg(); ~uu~NTz  
  // Dialog Data 1V1T1  
  //{{AFX_DATA(CAboutDlg) !)'|Y5 o  
  enum { IDD = IDD_ABOUTBOX }; 69/qH_Y  
  //}}AFX_DATA $6\W8v  
  // ClassWizard generated virtual function overrides .t9zF-jk  
  //{{AFX_VIRTUAL(CAboutDlg) n!y}p q6  
 protected: 9i#K{CkC|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -X#qW"92q  
  //}}AFX_VIRTUAL fT_swh IO  
  // Implementation n0kkUc-`   
 protected: g3,F+  
  //{{AFX_MSG(CAboutDlg) q"pnFK9/L  
  //}}AFX_MSG x$tzq+N  
  DECLARE_MESSAGE_MAP() g].hL  
}; =;A~$[g  
~b{j`T  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) u+uu?.bM  
{ Zu%oIk  
 //{{AFX_DATA_INIT(CAboutDlg) @?"t&h  
 //}}AFX_DATA_INIT Y{ 2xokJ N  
} 8rsv8OO  
X+XbIbUuL  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) nzORG  
{ ecy41y'~:  
 CDialog::DoDataExchange(pDX); &,@wLy^ T  
 //{{AFX_DATA_MAP(CAboutDlg) {p@uj_pS  
 //}}AFX_DATA_MAP ) BLoj:gYn  
} \78kShx  
T?E[LzZg  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) y7# 4Mcc`~  
 //{{AFX_MSG_MAP(CAboutDlg) a'ODm6#  
 // No message handlers XG}pp`{o  
 //}}AFX_MSG_MAP b(H) 8#C  
END_MESSAGE_MAP() q! U'DDEP  
7?JcB?G4  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }D eW2Jp  
: CDialog(CCaptureDlg::IDD, pParent) j>OB<4?.+  
{ Yhd|1,m9f  
 //{{AFX_DATA_INIT(CCaptureDlg) 8RR6f98FF  
  m_bControl = FALSE; ;]^JUmxU[d  
  m_bAlt = FALSE; ^@..\X9  
  m_bShift = FALSE; +bK.{1  
  m_Path = _T("c:\\"); mg^\"GC*8  
  m_Number = _T("0 picture captured."); #`H^8/!e  
  nCount=0; wh;E\^',n  
  bRegistered=FALSE; in6iJ*E@'  
  bTray=FALSE; cZ~\jpK  
 //}}AFX_DATA_INIT > ak53Ij$  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 tY=n("=2  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 3M&75OE  
} L&nGjC+Lr  
2=l !b/m  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) oxPb; %  
{ RycO8z*p  
 CDialog::DoDataExchange(pDX); 8;s$?*G i  
 //{{AFX_DATA_MAP(CCaptureDlg) XOy#? X/`  
  DDX_Control(pDX, IDC_KEY, m_Key); 4hv'OEl  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); d.&~n`Rv!p  
  DDX_Check(pDX, IDC_ALT, m_bAlt); M^^u{);q  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); cIgicp}U  
  DDX_Text(pDX, IDC_PATH, m_Path); $wn "+wX  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ,FPgbs  
 //}}AFX_DATA_MAP +>5 "fs$Y  
} \l leO|m  
D:HeP:.I  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) cNG6 A4  
//{{AFX_MSG_MAP(CCaptureDlg) 2v<[XNX  
 ON_WM_SYSCOMMAND() b#C"rTw  
 ON_WM_PAINT() 4&/-xg87(  
 ON_WM_QUERYDRAGICON() t%AW0#TZ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) rXz,<^Hmj  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Ucnit^,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) !Jj=H()}  
//}}AFX_MSG_MAP YtrMJ"  
END_MESSAGE_MAP() VRoeq {  
a;Y9wn  
BOOL CCaptureDlg::OnInitDialog() (Rk g  
{ FB PT@`~v  
 CDialog::OnInitDialog(); a|\_'#  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]eq3cwR[|  
 ASSERT(IDM_ABOUTBOX < 0xF000); \0pJ+@\T9  
 CMenu* pSysMenu = GetSystemMenu(FALSE); WiL~b =fT  
 if (pSysMenu != NULL) P + nT%  
 { mYk5f_}  
  CString strAboutMenu; 4>^ %_Xj[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); n.y72-&v  
  if (!strAboutMenu.IsEmpty()) AsM""x1Ix  
  { hGF(E*  
   pSysMenu->AppendMenu(MF_SEPARATOR); viBf" .  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2Xgw7` !L  
  } D] 2+<;>`>  
 } 0nz k?iP  
 SetIcon(m_hIcon, TRUE); // Set big icon Q_#X*I  
 SetIcon(m_hIcon, FALSE); // Set small icon 3Pp*ID  
 m_Key.SetCurSel(0); E4[\lX$J  
 RegisterHotkey(); 9=I(AYG{m  
 CMenu* pMenu=GetSystemMenu(FALSE); $/45*  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !{SU G+.2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @11voD  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?kb\%pcK  
 return TRUE; // return TRUE unless you set the focus to a control r/L3j0  
} DRV vW6s  
v4|kiy  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) bah5 f  
{ SJ7>*Sa(u$  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) j &Ayk*  
 { i4!n Oyk  
  CAboutDlg dlgAbout; (s{%XB:K  
  dlgAbout.DoModal(); Af0E_  
 } a@,tf'Sr  
 else S-yd-MtQp  
 { ?#D@e5Wf  
  CDialog::OnSysCommand(nID, lParam); Z#;ieI\  
 } e= "/oo  
} =W !m`  
VkhK2  
void CCaptureDlg::OnPaint() n*iaNaU"'  
{ M7,|+W/RK  
 if (IsIconic()) +U%lWE%  
 { _z m<[0(  
  CPaintDC dc(this); // device context for painting =$Q3!bJ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); xYt{=  
  // Center icon in client rectangle NM ~e  
  int cxIcon = GetSystemMetrics(SM_CXICON); *vsOL 4I%  
  int cyIcon = GetSystemMetrics(SM_CYICON); B?Y%y@.  
  CRect rect; p|Rxy"}  
  GetClientRect(&rect); hY'"^?OP  
  int x = (rect.Width() - cxIcon + 1) / 2; dt3Vy*zL  
  int y = (rect.Height() - cyIcon + 1) / 2; 9i|6  
  // Draw the icon 0#*\o1r\p  
  dc.DrawIcon(x, y, m_hIcon); '}4[m>/  
 } W {dx\+  
 else Z{_'V+Q1  
 { Qn%*kU0X  
  CDialog::OnPaint(); 5I(` s#O  
 } ;N"XW=F4e  
} S%xGXmZ  
cB<0~&  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;co{bk|rj  
{ D|-]"(2i  
 return (HCURSOR) m_hIcon; 1<5 9)RiO>  
} rhn*k f{8  
"v*RY "5#  
void CCaptureDlg::OnCancel() EUna_ 4=  
{ gi;V~>kh  
 if(bTray) 6u:5]e8  
  DeleteIcon(); `&9#!T.  
  CDialog::OnCancel(); <"[}8  
} Dh +^;dQ6  
PL+fLCk,I  
void CCaptureDlg::OnAbout() ={L:q8v)  
{ ,CM$A}7[  
 CAboutDlg dlg; Ha C?,  
 dlg.DoModal(); 'pm2C6AC  
} #{ Uk4  
Q}fAAZ&7h  
void CCaptureDlg::OnBrowse() q}\\p  
{ GF/p|I D  
 CString str; UN>hJN;c  
 BROWSEINFO bi; zRE7 w:  
 char name[MAX_PATH]; Zp__  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); acGmRP9g  
 bi.hwndOwner=GetSafeHwnd(); wH${q@z_  
 bi.pszDisplayName=name; 06Hn:IT18  
 bi.lpszTitle="Select folder"; 3&?Tc|F+  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; y:|7.f  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); vCpi|a_eCu  
 if(idl==NULL) am"/Anml|  
  return; <&L;9fr  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =v;-{oN!  
 str.ReleaseBuffer(); ZA9']u%EJ  
 m_Path=str; W>DpDrO4ml  
 if(str.GetAt(str.GetLength()-1)!='\\') +j@|D@z  
  m_Path+="\\"; U.^)|IHW  
 UpdateData(FALSE); dU&.gFw1  
} )Y *?VqZn  
*V"cu  
void CCaptureDlg::SaveBmp() s~]nsqLt9p  
{ '}rDmt~  
 CDC dc; BklB3*n  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); O5=ggG  
 CBitmap bm; Y\%}VD2k  
 int Width=GetSystemMetrics(SM_CXSCREEN); k Lv_P[I  
 int Height=GetSystemMetrics(SM_CYSCREEN); o"]eAQ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); $&e(V6A@  
 CDC tdc; xY~ DMcO?  
 tdc.CreateCompatibleDC(&dc); BO9Z "|"  
 CBitmap*pOld=tdc.SelectObject(&bm); Zi[)(agAT  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _ma4  
 tdc.SelectObject(pOld); Bw#ubQJ8}  
 BITMAP btm; M5x!84  
 bm.GetBitmap(&btm); q;>BltU  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Q[b({Vj;tG  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); h3)KT+7.  
 BITMAPINFOHEADER bih; x!$,Hcph,  
 bih.biBitCount=btm.bmBitsPixel; V.-?aXQ*  
 bih.biClrImportant=0; <m6Xh^Ko;  
 bih.biClrUsed=0; Wig0OZj  
 bih.biCompression=0; Qrt8O7&('  
 bih.biHeight=btm.bmHeight; n7MS{`  
 bih.biPlanes=1; c'|MC[^A  
 bih.biSize=sizeof(BITMAPINFOHEADER); MV/~Rmd.  
 bih.biSizeImage=size; cUm9s>^)/  
 bih.biWidth=btm.bmWidth; vfbe=)}[  
 bih.biXPelsPerMeter=0; K4F!?#  
 bih.biYPelsPerMeter=0; ~lF lv+,%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); & 9]KkY=  
 static int filecount=0; gP`!MlY@  
 CString name; Q./ lX:  
 name.Format("pict%04d.bmp",filecount++); $@Ay0GEI"  
 name=m_Path+name; `-/l$A} U  
 BITMAPFILEHEADER bfh; (jm.vL&5j  
 bfh.bfReserved1=bfh.bfReserved2=0; @LE?XlhD  
 bfh.bfType=((WORD)('M'<< 8)|'B'); G^(&B30V  
 bfh.bfSize=54+size; (Dar6>!  
 bfh.bfOffBits=54; #y*=UV|h  
 CFile bf; fM|g8(TK,  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ bK].qN  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7 IHD?pnZ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); NSgHO`gU8  
  bf.WriteHuge(lpData,size); ( Lu.^  
  bf.Close(); >C-_Zv<!T\  
  nCount++; dI 5sqM:  
 } /-hF<oNQ  
 GlobalFreePtr(lpData); hZ'oCRM  
 if(nCount==1) QlS5B.h,  
  m_Number.Format("%d picture captured.",nCount); x ?V/3zW  
 else nfJ8Rt   
  m_Number.Format("%d pictures captured.",nCount); #VOjnc/rW  
  UpdateData(FALSE); (wlsn6h  
} _eQ P0N  
vW{cB y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) tT8jC:oVa  
{ .#:,j1L"53  
 if(pMsg -> message == WM_KEYDOWN) L~oFW'  
 { y{{EC#  
  if(pMsg -> wParam == VK_ESCAPE) n>E*g|a  
   return TRUE; R_qo]WvR;  
  if(pMsg -> wParam == VK_RETURN) ,SyUr/D  
   return TRUE; !U#++Zig%  
 } x7@WWFF>  
 return CDialog::PreTranslateMessage(pMsg); r~}}o o4K  
} ) *A,L%  
'<0q"juXE  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) IP'igX  
{ @gqw]_W  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ `es($7}P_W  
  SaveBmp(); [[ e| GQ  
  return FALSE; 3opLLf_g  
} 0lRH Yu  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Z8&C-yCC  
 CMenu pop; sv;zvEn;-L  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ZW?7g+P  
 CMenu*pMenu=pop.GetSubMenu(0); reA8=>b/  
 pMenu->SetDefaultItem(ID_EXITICON); `oMeR]~  
 CPoint pt; ya{>=  
 GetCursorPos(&pt); Z0=m:h  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); L, {rMLM%  
 if(id==ID_EXITICON) |%}s$*s  
  DeleteIcon(); B (1,Rq[  
 else if(id==ID_EXIT) <]'"e]  
  OnCancel(); @ g75T`N  
 return FALSE; N4To#Q1w  
} ys/mv'#>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); B\ _u${C  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) mei_aN7zW  
 AddIcon(); RGO:p]t|  
 return res; A&P1M6Of  
} ;-?ZI$  
{}pqxouE  
void CCaptureDlg::AddIcon() kppRQ Q*[  
{ +?iM$}8!U  
 NOTIFYICONDATA data; <s-@!8*(  
 data.cbSize=sizeof(NOTIFYICONDATA); Uxemlp%%*  
 CString tip; 5b#6 Y  
 tip.LoadString(IDS_ICONTIP); * |HZ&}  
 data.hIcon=GetIcon(0); eh(Q^E;*  
 data.hWnd=GetSafeHwnd(); ~RXpz-Ye  
 strcpy(data.szTip,tip); 'Y[A'.*}4  
 data.uCallbackMessage=IDM_SHELL; p? ?/r  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; zcB 2[eaV  
 data.uID=98; b.4Xn0-M  
 Shell_NotifyIcon(NIM_ADD,&data); \5P.C  
 ShowWindow(SW_HIDE); qu ~|d}0  
 bTray=TRUE; RW 7oL:$dt  
} c[ ony:6  
*yaX:,'\$  
void CCaptureDlg::DeleteIcon() M%{?\)s  
{ >J}n@MZ  
 NOTIFYICONDATA data; jBv$^L  
 data.cbSize=sizeof(NOTIFYICONDATA); 2 1~7{#  
 data.hWnd=GetSafeHwnd(); b%;59^4AjD  
 data.uID=98; L)lQ&z?  
 Shell_NotifyIcon(NIM_DELETE,&data); }[z<iij4  
 ShowWindow(SW_SHOW); v1r_Z($  
 SetForegroundWindow(); )_v\{N  
 ShowWindow(SW_SHOWNORMAL); )@qup _M@  
 bTray=FALSE; (a}  
} P=^#%7J/l  
QP%kL*=8  
void CCaptureDlg::OnChange() 5)yOw|Bd  
{ "PyWo  
 RegisterHotkey(); @%<?GNSO  
} yvz?4m"_yB  
u5Ny=Xm  
BOOL CCaptureDlg::RegisterHotkey() FxfL+}?Q  
{ `<J#l;y  
 UpdateData(); v (ka,Dk3  
 UCHAR mask=0; irsfJUr[V  
 UCHAR key=0; _;:rkC fj  
 if(m_bControl) 8rwYNb.P  
  mask|=4; lKEX"KQ!  
 if(m_bAlt) ~pevU`}Uqc  
  mask|=2; ^5]u BOv  
 if(m_bShift) gKN}Of@^1  
  mask|=1; L"foL  
  key=Key_Table[m_Key.GetCurSel()]; C4{\@v}t  
 if(bRegistered){ VI24+h'J  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ESMG<vW&f  
  bRegistered=FALSE; !\0F.*   
 } VD24X  
 cMask=mask; poD \C;o"  
 cKey=key; ,?k%jcR  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5#0e={X  
 return bRegistered; Ud#X@xK<h  
} '_qQrP#  
rKzlK 'U  
  四、小结 P>Q{He:  
%l} Q?Z  
  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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