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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: 7SHllZ  
  J6CSu7Voa  
  一、实现方法 _5Lcr)  
|6Y:W$7k  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 8~(,qU8-N  
iOZ9A~Ywy  
#pragma data_seg("shareddata") ~S('\h)1  
HHOOK hHook =NULL; //钩子句柄 ) ' xyK  
UINT nHookCount =0; //挂接的程序数目 W$jRS  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 )"\= _E#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 W%+02_/)  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey -dovk?'Gj  
static int KeyCount =0; y7pBcyWTE=  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 OFr"RGW"  
#pragma data_seg() Q qF<HCO  
sN1H{W  
  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。 ;[ QIHA!  
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  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: +(DzE H |  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  z/91v#}.  
cKey,UCHAR cMask) yr+QV:oVA  
{ zmQQ/ 7K  
 BOOL bAdded=FALSE; 8(n>99 VVK  
 for(int index=0;index<MAX_KEY;index++){ 5{yg  
  if(hCallWnd[index]==0){ }$<v  
   hCallWnd[index]=hWnd; Z><+4 '  
   HotKey[index]=cKey; `pfgx^qG  
   HotKeyMask[index]=cMask; x9F *$G  
   bAdded=TRUE; n}Z%-w$K#  
   KeyCount++; P\dfxR;8%  
   break; }uMu8)Q  
  } %S^ke`MhF  
 } R7IFlQH%  
 return bAdded; C)m@/w  
} qf K gNZ  
//删除热键 NCg("n,jx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2XyyU}.$  
{ Bj{J&{  
 BOOL bRemoved=FALSE; z>+CMH5L)  
 for(int index=0;index<MAX_KEY;index++){ F lVG,Z  
  if(hCallWnd[index]==hWnd){ M5*Ln-qt(a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lFuW8G,-f@  
    hCallWnd[index]=NULL; d0T 8Cwc b  
    HotKey[index]=0; .?#Q(eLj  
    HotKeyMask[index]=0; jA^yUd-  
    bRemoved=TRUE; N#-%b"(  
    KeyCount--; -5e8m4*  
    break; ~Q"qz<WO  
   } !]R>D{""  
  } V?t*c [  
 } &u9,|n]O9  
 return bRemoved; R[j'<gd.  
} YP!}Bf  
;ZJ. 7t'  
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  DLL中的钩子函数如下: ih("`//nP  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %d:cC:`  
{ x%)oL:ue  
 BOOL bProcessed=FALSE; vZQraY nJ  
 if(HC_ACTION==nCode) R,.qQF\*  
 { O\q6T7bfRW  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 !*DY dqQ/  
   switch(wParam) Y, Lpv|  
   {  WTD86A  
    case VK_MENU: k3LHLJZ#  
     MaskBits&=~ALTBIT; YO.ddy*59  
     break; 0 {d)f1  
    case VK_CONTROL: maSVqG  
     MaskBits&=~CTRLBIT;  {y{O ze  
     break; b!-=L&V  
    case VK_SHIFT: mb_6f:Qh3  
     MaskBits&=~SHIFTBIT; DIYR8l}x  
     break; \*5z0A9)5)  
    default: //judge the key and send message S^1ZsD.  
     break; Z!q$d/1  
   } .,VLQ btg  
   for(int index=0;index<MAX_KEY;index++){ `E;xI v|  
    if(hCallWnd[index]==NULL) `+."X1  
     continue; Q-iBK*-w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @(6P L^I  
    { v"Bm4+c&0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); OGH,K'l  
     bProcessed=TRUE; Le-t<6i-V#  
    } yz>S($u  
   } kg(}%Ih  
  } xA;)02   
  else if((lParam&0xc000ffff)==1){ //有键按下 wk?i\vm  
   switch(wParam) 6e|uA7i4  
   { D1ik*mDA=  
    case VK_MENU: e~he#o[%a  
     MaskBits|=ALTBIT; wKcuIc$  
     break; {Gh9(0,B?  
    case VK_CONTROL: CE (zt  
     MaskBits|=CTRLBIT; $<VH~Q<  
     break; f\hQ>MLzt  
    case VK_SHIFT: #xR=U"  
     MaskBits|=SHIFTBIT; Qo]qs+  
     break; non5e)w3@  
    default: //judge the key and send message !mVq+_7]  
     break; r^E(GmW  
   } )yz)Fw|&  
   for(int index=0;index<MAX_KEY;index++){ Bs '=YK$  
    if(hCallWnd[index]==NULL) mq}uq9<  
     continue; .2|(!a9W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1TzwXX7  
    { zk@s#_3ct  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x!7!)]h  
     bProcessed=TRUE; mWP&N#vwh  
    } ]l=CiG4!M  
   } r0OP !u  
  } D\-DsT.H  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .f[z_% ar  
   for(int index=0;index<MAX_KEY;index++){ Gf!c  
    if(hCallWnd[index]==NULL) I~HA ad,k  
     continue; CCC9I8rZD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #l*w=D?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); M) JozD%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 [k%u$  
   } $E8}||d  
  } C%%gCPI^y  
 } k:mW ,s|a  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :"nh76xg<  
} tr A ^JY  
l"h6e$dP  
  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: /,< s9 :  
p? w^|V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ai:, cY5%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -U7,~z  
^P.U_2&  
  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: ".pQM.T  
1(i%nX<U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *6}'bdQbNP  
{ fG8^|:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Ss+  
 { z X+i2,  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 >%N,F`^3  
  SaveBmp(); T`u ,!S  
  return FALSE; 6Xn9$C)  
 } ,t*H: *  
 …… //其它处理及默认处理 >~'z%  
} }Q^*Zq9-  
"2tKh!?Q  
cUw$F{|W  
  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。 )RWY("SUy1  
?oV|.LM:W  
  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。 R9K~b^`  
Y!y pG-  
  二、编程步骤 " w /Odd  
4,=;:#n,J  
  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"; tp"eXA0n  
! P$[$W  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; eT2Tg5Etc  
#op0|:/N  
  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; ?5% o-hB|  
m,5?|J=  
  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; lG[j,MDs  
v4X ` Ul*  
  5、 添加代码,编译运行程序。 Da)_OJYE  
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三、程序代码 `0+-:sXZ6  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL wq8&2(|Fc  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) h >Z`&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wT,=C'  
#if _MSC_VER > 1000 va"bw!zXo*  
#pragma once 9@nd>B  
#endif // _MSC_VER > 1000 L{XW2c$h  
#ifndef __AFXWIN_H__ [{>1wJ Pdj  
#error include 'stdafx.h' before including this file for PCH u3Zu ~C  
#endif X<v1ES$  
#include "resource.h" // main symbols _1YC9}  
class CHookApp : public CWinApp =L?2[a$2;  
{ ^oE#;aS  
 public: q(2ZJn13f  
  CHookApp(); ?O]RQXsZ2  
  // Overrides \zDs3Hp  
  // ClassWizard generated virtual function overrides 5Z:qU{[  
  //{{AFX_VIRTUAL(CHookApp) 0xeY0!ux  
 public: \W\*'C8q\  
  virtual BOOL InitInstance(); 9pWSvalw9  
  virtual int ExitInstance(); &2ty++gC  
  //}}AFX_VIRTUAL ;R@D  
  //{{AFX_MSG(CHookApp) N&$ ,uhmO  
  // NOTE - the ClassWizard will add and remove member functions here. {#pw rWG  
  // DO NOT EDIT what you see in these blocks of generated code ! 2^rJ|Ni  
  //}}AFX_MSG Wn?),=WQ{  
  DECLARE_MESSAGE_MAP() s+=':Gcb(C  
}; f)r6F JLU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); x2OAkkH\]i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /?S^#q>m%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xm=$D6O:  
BOOL InitHotkey(); & Yx12B\  
BOOL UnInit(); `z7,HJ.0c  
#endif _lm^v%J$  
=)w#?DGpj  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. wAL}c(EHO  
#include "stdafx.h" a#9pN?~  
#include "hook.h" p|BoEITL  
#include <windowsx.h> #]gmM  
#ifdef _DEBUG AYp~;@  
#define new DEBUG_NEW pEW~zl  
#undef THIS_FILE NQvI=R-g  
static char THIS_FILE[] = __FILE__; 9E[==2TO  
#endif !?|xeQ}  
#define MAX_KEY 100 K7nyQGS  
#define CTRLBIT 0x04 > +00[T  
#define ALTBIT 0x02 9}4~3_gv;M  
#define SHIFTBIT 0x01 jmP;(j.|  
#pragma data_seg("shareddata") ',rK\&lL6  
HHOOK hHook =NULL; S a}P |qI  
UINT nHookCount =0; cz|?j  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey -_O j iQ R  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3od16{YH  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #ZP;] W  
static int KeyCount =0; |WOc0M[U  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Oi-%6&}J  
#pragma data_seg() aEVy20wd  
HINSTANCE hins; T{yJL<  
void VerifyWindow(); \F""G,AWq{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8yH)9#>  
//{{AFX_MSG_MAP(CHookApp) ^r mQMjF  
// NOTE - the ClassWizard will add and remove mapping macros here. ,g,Hb\_R)  
// DO NOT EDIT what you see in these blocks of generated code! T4[/_;1g  
//}}AFX_MSG_MAP pmO0/ty  
END_MESSAGE_MAP() i` ay9J8N  
sc6NON#  
CHookApp::CHookApp() %hdjQIH  
{ 2Vw2r@S/  
 // TODO: add construction code here, ZNL+w4  
 // Place all significant initialization in InitInstance g=,}j]tl  
} /{ W6]6^  
TNK1E  
CHookApp theApp; ?zbWz=nq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) wkV'']= Xg  
{ BL"7_phM,  
 BOOL bProcessed=FALSE; Ki&a"Fu3  
 if(HC_ACTION==nCode) YBF$/W+=9|  
 { < $otBC/%  
  if((lParam&0xc0000000)==0xc0000000){// Key up Htln <N  
   switch(wParam) & Y2xO  
   { Bvh{|tP4  
    case VK_MENU: SQ/HZ  
     MaskBits&=~ALTBIT; ,xAF=t  
     break; #VVfHCy  
    case VK_CONTROL: \<G"9w  
     MaskBits&=~CTRLBIT; |{_>H '  
     break; ED>a'y$f  
    case VK_SHIFT: y*v|q=  
     MaskBits&=~SHIFTBIT; >7S@3,C3ke  
     break; ]0j_yX  
    default: //judge the key and send message !]RSG^%s{  
     break; mZjpPlJ  
   } xtLP 4VL  
   for(int index=0;index<MAX_KEY;index++){ x;Slv(|M  
    if(hCallWnd[index]==NULL) <^_crJONom  
     continue; 0r8Wv,7Bo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @2 *Q*  
    { =)gdxywoC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); WIpV'F|t]`  
     bProcessed=TRUE; %qTIT?6'  
    } 6<R[hIWpZ}  
   } .aVtd [  
  } PL3hrI 5  
  else if((lParam&0xc000ffff)==1){ //Key down 2i1xSKRYrD  
   switch(wParam) &ODo7@v`1  
   { bSz7?NAp  
    case VK_MENU: 9 %i\)  
     MaskBits|=ALTBIT; ~131|e`C  
     break; p8?v o ?^  
    case VK_CONTROL: ecR)8^1 '  
     MaskBits|=CTRLBIT; ]^>:)q  
     break; =  
    case VK_SHIFT: J_-fs#[x  
     MaskBits|=SHIFTBIT; 4l6 8+  
     break; M}f(-,9  
    default: //judge the key and send message CjP<'0gT  
     break; +mzLOJed  
   } $bFK2yx?=  
   for(int index=0;index<MAX_KEY;index++) zNdkwj p+  
   { F *r)  
    if(hCallWnd[index]==NULL) kfT*G +l]  
     continue; s(J>yd=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oD1k7Gq1  
    { Xc}XRKiy{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1?1Bz?EKF*  
     bProcessed=TRUE; 8N?D1; F;  
    } o)^ Wz  
   } pRL:,q\  
  } ( }Bb=~  
  if(!bProcessed){ UxzF5V5  
   for(int index=0;index<MAX_KEY;index++){ 2Q5@2jT  
    if(hCallWnd[index]==NULL) Hbd>sS  
     continue; z ynu0X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) AX<f$%iqD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Y0A(- "  
   } +@?'dw  
  } uLWu. Vx  
 } hpPacN  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +*?l">?|F  
} :zPK  
f5FEHyj|  
BOOL InitHotkey() GZNN2 '  
{ 2A[hMbL  
 if(hHook!=NULL){ 6$'*MpYF4  
  nHookCount++; lv'WRS'}  
  return TRUE; L \E>5G;  
 } # #2'QNN  
 else $T^q>v2u  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &ah%^Z4um  
  if(hHook!=NULL) oW 6Hufu+o  
   nHookCount++; t"q'"FX  
  return (hHook!=NULL); yb ?Pyq.D  
} Hz2Sx1.i  
BOOL UnInit() V|$PO Qa3  
{ p?,<{mAe  
 if(nHookCount>1){ "wTCO1  
  nHookCount--; Zis,%XY  
  return TRUE; ^jwzCo-  
 } |%v:>XEO  
 BOOL unhooked = UnhookWindowsHookEx(hHook); G 2)F<Y  
 if(unhooked==TRUE){ 3IlVSR^py  
  nHookCount=0; ,aC}0t  
  hHook=NULL; (I#6!Yt9J  
 } k_7b0 dr%F  
 return unhooked; 40h$- VYT/  
} fs&$?mHL){  
-P/DmSS8V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q47R`"  
{ J 3C^tV  
 BOOL bAdded=FALSE; jqc}mI\#  
 for(int index=0;index<MAX_KEY;index++){ _lwKa, }  
  if(hCallWnd[index]==0){ a*U[;(  
   hCallWnd[index]=hWnd; e'G=.:  
   HotKey[index]=cKey; Y$A2{RjRq  
   HotKeyMask[index]=cMask; ng!cK<p  
   bAdded=TRUE; i\ X3t5  
   KeyCount++; +KIz#uqF8Z  
   break; 85q/|9D  
  } YRX^fZ-b  
 } ,v>;/qm  
 return bAdded; %\HPYnIe  
} rxu_Ssd@"  
C1=&Vm>g+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <TtPwUX  
{ m{ !$_z8:  
 BOOL bRemoved=FALSE; zdRVAcrwQ  
 for(int index=0;index<MAX_KEY;index++){ tJrGRlB>  
  if(hCallWnd[index]==hWnd){ #NYnZ^6e  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ : #CWiq("%  
    hCallWnd[index]=NULL; "5~?`5Ff  
    HotKey[index]=0; R P<M  
    HotKeyMask[index]=0; ,#3Aaw   
    bRemoved=TRUE; EHm*~Sd  
    KeyCount--; e,_Sj(R8  
    break; 0lg'QG>  
   } 4J_HcatOB  
  } `y.4FA4"8  
 } *u"%hXR  
 return bRemoved; K6p\ >J  
} nsU7cLf"^V  
"I/05k K  
void VerifyWindow() S*h^7?Bu  
{ >,]a>V  
 for(int i=0;i<MAX_KEY;i++){ N wk  
  if(hCallWnd!=NULL){ )- &@ 8`  
   if(!IsWindow(hCallWnd)){ PKrG6% W+  
    hCallWnd=NULL; 9u{[e"  
    HotKey=0; &'W7-Z\j-  
    HotKeyMask=0; ?j.a>{  
    KeyCount--; Q!@M/@-Ky  
   } E2>{ seZ  
  } K?' m#}]  
 } )2?]c  
} zMbFh_dcq  
18rV Acj  
BOOL CHookApp::InitInstance() E0+L?(;  
{ sT2`y$ '  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); =f!A o:Uc  
 hins=AfxGetInstanceHandle(); RxYENG]/6  
 InitHotkey(); %QEBY>|lI  
 return CWinApp::InitInstance(); >ceC8"}J5M  
} N'ER!=l)  
l+"p$iZs  
int CHookApp::ExitInstance() O|8@cO  
{ @u9L+*F  
 VerifyWindow(); ?5nEmG|kO  
 UnInit(); ?DUim1KG  
 return CWinApp::ExitInstance(); HZRFE[ 9nb  
} L?N&kzA  
aj;x:UqpJ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file MSS[-}  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?YL J Xq  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ B.5+!z&7  
#if _MSC_VER > 1000 e3SnC:OWf  
#pragma once Az:~|P  
#endif // _MSC_VER > 1000 5WHz_'c  
zU&Iy_Ke.  
class CCaptureDlg : public CDialog qSr]d`7@  
{ 'fU#v`i  
 // Construction 6I"KomJ9  
 public: h#r~2\q4ei  
  BOOL bTray; / e>%yq<9B  
  BOOL bRegistered; D=z~]a31!  
  BOOL RegisterHotkey(); wz`% ( \  
  UCHAR cKey; piM4grg \  
  UCHAR cMask; $TXiWW+  
  void DeleteIcon(); |hika`35K  
  void AddIcon(); 3k/E$wOj  
  UINT nCount; \[3~*eX6  
  void SaveBmp(); z)C/U  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor md+pS"8o;  
  // Dialog Data yor'"6)i  
  //{{AFX_DATA(CCaptureDlg) <jV,VKL#  
  enum { IDD = IDD_CAPTURE_DIALOG }; Sz Mh  
  CComboBox m_Key; ]Wkgpfd56  
  BOOL m_bControl; RQ8d1US  
  BOOL m_bAlt; yR>P  
  BOOL m_bShift; j_so s%-  
  CString m_Path; 62R";# K  
  CString m_Number; ,:(s=J N+  
  //}}AFX_DATA N=1ue`i  
  // ClassWizard generated virtual function overrides ZEI)U, I.  
  //{{AFX_VIRTUAL(CCaptureDlg) C5dM`_3L  
 public: (7G4v  
  virtual BOOL PreTranslateMessage(MSG* pMsg); E42)93~C  
 protected: rt*x[5<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8 8_ef7w  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); b:F;6X0~Hl  
  //}}AFX_VIRTUAL PEvY3F}_rh  
  // Implementation [oU\l+t  
 protected: f5 bq)Pm&  
  HICON m_hIcon; vmAnBY  
  // Generated message map functions n5d8^c!2  
  //{{AFX_MSG(CCaptureDlg) qF~9:`  
  virtual BOOL OnInitDialog(); Mn ,hmIz  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >1!u]R<3  
  afx_msg void OnPaint(); G%bv<_R  
  afx_msg HCURSOR OnQueryDragIcon(); J "I,]  
  virtual void OnCancel(); 8S8qj"s  
  afx_msg void OnAbout(); gvT}UNqL  
  afx_msg void OnBrowse(); zz U,0 L  
  afx_msg void OnChange(); gP QOv  
 //}}AFX_MSG $}W T"K  
 DECLARE_MESSAGE_MAP() sr;&/l#7h  
}; >ZOlSLu  
#endif 5m~9Vl-&  
$XQgat@&]  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file }2;P`s  
#include "stdafx.h" b69nj  
#include "Capture.h" G"F O%3&|  
#include "CaptureDlg.h" 7!AyLw  
#include <windowsx.h> x[{\Aw>$.  
#pragma comment(lib,"hook.lib") .S|7$_9;b  
#ifdef _DEBUG sn:VMHrOT  
#define new DEBUG_NEW j_g(6uZhz3  
#undef THIS_FILE j ^j"w(a  
static char THIS_FILE[] = __FILE__; ly` A,dh  
#endif  =Iop  
#define IDM_SHELL WM_USER+1 |-V:#1wR.]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &233QRYM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M6p\QKi  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; B%\&Q @X  
class CAboutDlg : public CDialog LnE/62){N  
{ ,7@\e &/&  
 public: X,w X)9]J  
  CAboutDlg(); }BC%(ZH6  
  // Dialog Data X\;:aRDS  
  //{{AFX_DATA(CAboutDlg) Im~DK  
  enum { IDD = IDD_ABOUTBOX }; Z4/D38_  
  //}}AFX_DATA &/U fXKr  
  // ClassWizard generated virtual function overrides VVSt,/SO  
  //{{AFX_VIRTUAL(CAboutDlg) A*DN/lG  
 protected: ];w}?LFb  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2om:S+3)2  
  //}}AFX_VIRTUAL 4ekwmw(ox  
  // Implementation Cl&mz1Y;]1  
 protected: ZJ%NZAxy  
  //{{AFX_MSG(CAboutDlg) ppz3"5  
  //}}AFX_MSG %l!A%fn(  
  DECLARE_MESSAGE_MAP() imif[n+]}d  
}; l[i4\ CT  
\#%GVru!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) EFC+7L(j  
{ qj _0 td$  
 //{{AFX_DATA_INIT(CAboutDlg) 'zm5wqrkAd  
 //}}AFX_DATA_INIT }MOXJb @  
} op`9(=DJ]  
%}TJr]'F  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) E$ \l57  
{ [E p'm  
 CDialog::DoDataExchange(pDX); rEWJ3*Hb  
 //{{AFX_DATA_MAP(CAboutDlg) "yQBHYP  
 //}}AFX_DATA_MAP B<EqzP*#  
}  ]+Whv%M  
~!Sd|e:4  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2*75*EQCH  
 //{{AFX_MSG_MAP(CAboutDlg) ) Z3KO  
 // No message handlers nV8'QDQ:Al  
 //}}AFX_MSG_MAP Q*<KX2O  
END_MESSAGE_MAP() BO*)cLQ  
_3%$E.Q  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) HFP'b=?`]|  
: CDialog(CCaptureDlg::IDD, pParent) AI3x,rk#  
{ ;wMu  
 //{{AFX_DATA_INIT(CCaptureDlg) ZS+m}.,whQ  
  m_bControl = FALSE; 8i[TeW"  
  m_bAlt = FALSE; j.]]VA  
  m_bShift = FALSE; P0m9($JBD  
  m_Path = _T("c:\\"); %WU=Vy4  
  m_Number = _T("0 picture captured."); zlEI_th:~  
  nCount=0; -sA&1n"W&5  
  bRegistered=FALSE; O=bkq}  
  bTray=FALSE; 2gO@   
 //}}AFX_DATA_INIT GkU_01C  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !$l<'K$  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Brxnl,%\  
} 5!A:xV]6]  
k9*UBx  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /#vt \I<x  
{ VX&g[5zr  
 CDialog::DoDataExchange(pDX); 6Tmz!E0  
 //{{AFX_DATA_MAP(CCaptureDlg) s@:Yu  
  DDX_Control(pDX, IDC_KEY, m_Key); BGi'UL,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); p7> 9 m  
  DDX_Check(pDX, IDC_ALT, m_bAlt); z$^wCd:  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 2o(O`;z  
  DDX_Text(pDX, IDC_PATH, m_Path); Nsh/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *e [*  
 //}}AFX_DATA_MAP (km $qX  
} XdA]);,  
I<RARB-j  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ?<4pYEP  
//{{AFX_MSG_MAP(CCaptureDlg) :2xGfy??  
 ON_WM_SYSCOMMAND() \\ItN  
 ON_WM_PAINT() T P#Ncqh  
 ON_WM_QUERYDRAGICON() ZgEV-.>P  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) =LLpJ+  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) V/xXW=  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ~.x#ic  
//}}AFX_MSG_MAP %iNgHoH  
END_MESSAGE_MAP() F-ZTy"z  
5)Z=FUupA~  
BOOL CCaptureDlg::OnInitDialog() qnyacI  
{ nmn/4>  
 CDialog::OnInitDialog();  GpTZp#~;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Q0"?TSY  
 ASSERT(IDM_ABOUTBOX < 0xF000); >dK0&+A  
 CMenu* pSysMenu = GetSystemMenu(FALSE); G.O;[(3ab  
 if (pSysMenu != NULL) [?N,3  
 { rPy,PQG2w  
  CString strAboutMenu; 6t7FklM%  
  strAboutMenu.LoadString(IDS_ABOUTBOX); j.6!T'$|  
  if (!strAboutMenu.IsEmpty()) c[2ikI,n[  
  { G HQ~{  
   pSysMenu->AppendMenu(MF_SEPARATOR); %?n=I n(F  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %|+aI?  
  } _YlyS )#@  
 } {i=V:$_#  
 SetIcon(m_hIcon, TRUE); // Set big icon \y271}'  
 SetIcon(m_hIcon, FALSE); // Set small icon Jq)k5X>&Sj  
 m_Key.SetCurSel(0); *J^FV^E``  
 RegisterHotkey(); *2/qm:gB  
 CMenu* pMenu=GetSystemMenu(FALSE); Qa/1*Mb  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Da)p%E>Q  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); -flcB|I`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); f {2UL ?y  
 return TRUE; // return TRUE unless you set the focus to a control +a,#BSt  
} dpE^BWv3  
Hc8^w6S1@  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 82 |^o  
{ "Ia.$,k9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) J#H,QYnf(L  
 { yz0#0YG7  
  CAboutDlg dlgAbout; g]h@U&`~u_  
  dlgAbout.DoModal(); pvl];w  
 } OU` !c[O  
 else E8PwA.  
 { *MfH\X379  
  CDialog::OnSysCommand(nID, lParam); mEYfsO  
 } P%&|?e~D^  
} `0%;Gz%}  
7./WS,49  
void CCaptureDlg::OnPaint() I/upiqy  
{ ?99r>01>  
 if (IsIconic()) [bKc5qp  
 { @?J7=}bzz  
  CPaintDC dc(this); // device context for painting .!^OmT,u  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %n6<6t`$  
  // Center icon in client rectangle @VHstjos^V  
  int cxIcon = GetSystemMetrics(SM_CXICON); 0VQBm^$(  
  int cyIcon = GetSystemMetrics(SM_CYICON); z2Wblh"_  
  CRect rect;   +fM8  
  GetClientRect(&rect); G"3KYBN>  
  int x = (rect.Width() - cxIcon + 1) / 2; \nyqW4nTm  
  int y = (rect.Height() - cyIcon + 1) / 2; %I`'it2d  
  // Draw the icon m["e7>9G  
  dc.DrawIcon(x, y, m_hIcon); ;uc3_J]  
 } @$kzes\  
 else a5m[ N'kah  
 { ~Fo2MwE2~  
  CDialog::OnPaint(); #]^C(qmb:  
 } :I /9j=@1  
} HZ!<dy3  
z|],s]F>G  
HCURSOR CCaptureDlg::OnQueryDragIcon() -]}#Z:&  
{ lmUCrs37  
 return (HCURSOR) m_hIcon; XySkm2y  
} f'"PQr^9  
/T  {R\  
void CCaptureDlg::OnCancel() ~C>;0a;<:  
{ W\0u[IV.x  
 if(bTray) ' xaPahx;  
  DeleteIcon(); I AUc.VH  
  CDialog::OnCancel(); wAu]U6!  
} }+S~Ah?(  
*!%n`BR '  
void CCaptureDlg::OnAbout() v1+.-hO  
{ h8M_Uk  
 CAboutDlg dlg; !S7?:MJ?p\  
 dlg.DoModal(); jR:\D_:  
} +B8oW3v# )  
bUy!hS;s  
void CCaptureDlg::OnBrowse() dtV*CX.D.7  
{ f6SXXkO+  
 CString str; zV15d91GX  
 BROWSEINFO bi; /W f.Gt9[  
 char name[MAX_PATH]; r$M<vo6C  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); &xUCXj2-z  
 bi.hwndOwner=GetSafeHwnd(); Wn=I[K&&  
 bi.pszDisplayName=name; t:oq't  
 bi.lpszTitle="Select folder"; BINHCZ  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; =^Ws/k  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); (7,Q4T  
 if(idl==NULL) c3rj :QK6I  
  return; opn6 C )  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Jk`l{N  
 str.ReleaseBuffer(); "g"%7jK  
 m_Path=str; /_expSPHl  
 if(str.GetAt(str.GetLength()-1)!='\\') v`'Iew }  
  m_Path+="\\"; h(~of (  
 UpdateData(FALSE); 2YQBw,gG  
} &\5bo=5V  
|FaK =e  
void CCaptureDlg::SaveBmp() ub1~+T'O  
{ WFFd3TN%<  
 CDC dc; F3q<j$y  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Rq",;,0ZJ  
 CBitmap bm; RxV " ,  
 int Width=GetSystemMetrics(SM_CXSCREEN); Yc)Dx3  
 int Height=GetSystemMetrics(SM_CYSCREEN); e50xcf1u  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Y> E` 7n  
 CDC tdc; tqB6:p-%  
 tdc.CreateCompatibleDC(&dc); c9nv=?/}f  
 CBitmap*pOld=tdc.SelectObject(&bm);  -y_q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); wUg=j nY   
 tdc.SelectObject(pOld); eLHhfu;k  
 BITMAP btm; @kT@IQkri  
 bm.GetBitmap(&btm); vz:VegS  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; BlT)hG(M>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ]<%NX $9\  
 BITMAPINFOHEADER bih; A'u]z\&%c  
 bih.biBitCount=btm.bmBitsPixel; [z_z tK1  
 bih.biClrImportant=0; ?mVSc/  
 bih.biClrUsed=0; 1B 0[dK2N  
 bih.biCompression=0; 8U]mr+  
 bih.biHeight=btm.bmHeight; <?;KF2A({  
 bih.biPlanes=1; _D+J3d(Pjk  
 bih.biSize=sizeof(BITMAPINFOHEADER); J5f}-W@  
 bih.biSizeImage=size; NVom6K  
 bih.biWidth=btm.bmWidth; cV`NQt<W  
 bih.biXPelsPerMeter=0; 5YI6$ZdQ  
 bih.biYPelsPerMeter=0; BP&] t1p  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "9vL+Hh  
 static int filecount=0; %\'G2  
 CString name; K1;b4Sl?A  
 name.Format("pict%04d.bmp",filecount++); u Vv %k5  
 name=m_Path+name; 1Z(9<M1!M  
 BITMAPFILEHEADER bfh; vQoZk,  
 bfh.bfReserved1=bfh.bfReserved2=0; CNWA!1n^Hy  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ~Kt+j  
 bfh.bfSize=54+size; VGCd)&s  
 bfh.bfOffBits=54; zqXDD; w3  
 CFile bf; Cnu])R  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {8;}y[R  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -\Z`+kY?p  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ][8`}ki 1  
  bf.WriteHuge(lpData,size); ,x3< a}J  
  bf.Close(); k cNPdc  
  nCount++; {?mb.~(  
 } UQb|J9HY4  
 GlobalFreePtr(lpData); J'&K  
 if(nCount==1) NUtKT~V  
  m_Number.Format("%d picture captured.",nCount); t`eIkq|NxI  
 else :"i2`y;u  
  m_Number.Format("%d pictures captured.",nCount); r'*#i>PkQD  
  UpdateData(FALSE); M,r8 No  
} g\49[U}[~F  
vZqW,GDfXo  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ) 2jH&}K  
{ cI@'Pr4:FJ  
 if(pMsg -> message == WM_KEYDOWN) :$XlYJrjK  
 { pG v*{.  
  if(pMsg -> wParam == VK_ESCAPE) 5RF*c,cNq  
   return TRUE; 3?+t%_[  
  if(pMsg -> wParam == VK_RETURN) je>mAQKi\  
   return TRUE; -_Z  
 } +mO/9m  
 return CDialog::PreTranslateMessage(pMsg); O_DT7;g  
} AZ\f6r{  
xaq/L:I<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |b!Bb<5  
{ k~QmDq  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \ ~C/  
  SaveBmp(); NR^3 1&}It  
  return FALSE; +.u HY`A  
} iqWkhJphv  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =ATQ2\T$m  
 CMenu pop; ZV-Yq !|t  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); y8v0>V0)  
 CMenu*pMenu=pop.GetSubMenu(0); O4^' H}*  
 pMenu->SetDefaultItem(ID_EXITICON); H.t fn>N|  
 CPoint pt; {JfL7%  
 GetCursorPos(&pt); R0q|{5S  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2H~E~6G  
 if(id==ID_EXITICON) JUq7R%"h6  
  DeleteIcon(); J8&0l&~ 6  
 else if(id==ID_EXIT) AG G xx?I  
  OnCancel(); _akpW  
 return FALSE; )<5hga][~a  
} _|COnm  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); AbX#wpp!  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) H[?l)nZ}  
 AddIcon(); 0.U- tg0  
 return res; }AS3]Lub@  
} @A-E  
^jk-GRD*  
void CCaptureDlg::AddIcon() j:2*hF!E  
{  {C%f~j  
 NOTIFYICONDATA data; H 9?txNea  
 data.cbSize=sizeof(NOTIFYICONDATA); ]1q`N7  
 CString tip; ?{OU%usQwE  
 tip.LoadString(IDS_ICONTIP); hz-^9U  
 data.hIcon=GetIcon(0); AFWWGz  
 data.hWnd=GetSafeHwnd(); CI|#,^  
 strcpy(data.szTip,tip); aM\Ph&c7e'  
 data.uCallbackMessage=IDM_SHELL; -Y>QKS  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yM?jiy  
 data.uID=98; .ITTYQHv)  
 Shell_NotifyIcon(NIM_ADD,&data); NLev(B:OQH  
 ShowWindow(SW_HIDE); o"qG'\x  
 bTray=TRUE; <07~EP  
} h- %RSei5  
jf=90eJc  
void CCaptureDlg::DeleteIcon() 6+SaO !lR  
{ Lv-M.  
 NOTIFYICONDATA data; f3mQd}<L  
 data.cbSize=sizeof(NOTIFYICONDATA); u/` t+-A  
 data.hWnd=GetSafeHwnd(); ;4*mUD6  
 data.uID=98; pH396GFIW  
 Shell_NotifyIcon(NIM_DELETE,&data); X D \;|  
 ShowWindow(SW_SHOW); iMF-TR  
 SetForegroundWindow(); *zv*T"&ZP  
 ShowWindow(SW_SHOWNORMAL); J/c5)IB|  
 bTray=FALSE; 1HeE$  
} /,+&O#SX  
U)_x(B3d/  
void CCaptureDlg::OnChange() 9y;zk$O8  
{ BHS8MV L@  
 RegisterHotkey(); zCj#Nfm  
} ;@<e]Ft  
X7)B)r}AG  
BOOL CCaptureDlg::RegisterHotkey() b2hXFwPe  
{ W"5VqN6v  
 UpdateData(); D|/ 4),v  
 UCHAR mask=0; 3/CKy##r%]  
 UCHAR key=0; H|<Zm:.%$  
 if(m_bControl) eMUt%zvb  
  mask|=4; E&\ 0+-Dw  
 if(m_bAlt) =u.hHkx  
  mask|=2; v.>95|8  
 if(m_bShift) +wm%`N;v<  
  mask|=1; *YP;HL  
  key=Key_Table[m_Key.GetCurSel()]; A7aW]  
 if(bRegistered){ 4R9y~~+  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); W>E|Iv[o  
  bRegistered=FALSE; CD)JCv  
 } o3oTu  
 cMask=mask; \!4_m8?  
 cKey=key; 5:SS2>~g  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); {0\9HI@  
 return bRegistered; 1m<8M[6u  
} a7TvX{<d  
.\"8H1I\T  
  四、小结 4X$|jGQ\  
1W{t?1[s  
  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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