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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: IpX>G]"-C  
  nQ/R,+6h  
  一、实现方法 fh0a "#L{  
8._ A[{.f  
  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: mCa [?  
}{J5)\s9  
#pragma data_seg("shareddata") l .8@F  
HHOOK hHook =NULL; //钩子句柄 6dG:3n}  
UINT nHookCount =0; //挂接的程序数目 ##gq{hgjb$  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 a&6e~E$K2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9V]\,mD=  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey y#'|=0vTvP  
static int KeyCount =0; V^a] @GK:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 LV4]YC  
#pragma data_seg() }1ABrbc  
@S/jVXA  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ;]* %wX  
H\OV7=8  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: S H"e x,=  
Iv6(Z>pAB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR os<B}D[  
cKey,UCHAR cMask) @z8,XW }  
{ wHSas[4k  
 BOOL bAdded=FALSE; RR u1/nam  
 for(int index=0;index<MAX_KEY;index++){ 1LbJR'}  
  if(hCallWnd[index]==0){ T)"B35  
   hCallWnd[index]=hWnd; n+db#qAj5  
   HotKey[index]=cKey; T}ZUw;}BL  
   HotKeyMask[index]=cMask; b~khb!]  
   bAdded=TRUE; IXp(Aeb  
   KeyCount++; qVOlUH  
   break; sLGut7@Sg  
  } #{]X<et  
 } @`&kn;7T  
 return bAdded; Xsvf@/]U  
} B'( /W@  
//删除热键 O7p>"Bh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) O1+2Z\F  
{ c#?JW:^|Df  
 BOOL bRemoved=FALSE; j'#Y$d1.  
 for(int index=0;index<MAX_KEY;index++){ LTGKs^i4  
  if(hCallWnd[index]==hWnd){ K5O8G  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /Ulv/Thl  
    hCallWnd[index]=NULL; 4ZY0!'be-R  
    HotKey[index]=0; ,qF;#nB-  
    HotKeyMask[index]=0; g5gq {KlU  
    bRemoved=TRUE; iXp*G52  
    KeyCount--; yQA6w%  
    break; |/u&%w?W  
   } Byx8`Cx1  
  } &,pL3Qos  
 } KLpe!8tAe  
 return bRemoved; Xx~za{p  
} FOB9J.w4  
D$W&6'  
26yjQ  
  DLL中的钩子函数如下: D -Goi-4  
!,f{I5/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) P&Vqr  
{ :x*|?zII  
 BOOL bProcessed=FALSE; C?v_ig  
 if(HC_ACTION==nCode) [<;4$}f\  
 { 6xk~Bt  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 v7?sXW  
   switch(wParam) }P8@\2@=T  
   {  ;Kq/[$~0  
    case VK_MENU: {\!_S+}{  
     MaskBits&=~ALTBIT; 3urL*Fw,  
     break; %:bTOw[4r  
    case VK_CONTROL: ][b_l(r$?  
     MaskBits&=~CTRLBIT; !a"RHg:HO  
     break; v%_5!SR  
    case VK_SHIFT: Tx)X\&ij&  
     MaskBits&=~SHIFTBIT; %d<uOCf\Q  
     break; u{F^Ngy )  
    default: //judge the key and send message zKycd*X  
     break; 's.%rre%  
   } UZ8 vZ  
   for(int index=0;index<MAX_KEY;index++){ 8!a6)Zeux  
    if(hCallWnd[index]==NULL) Q;m:o8Q5  
     continue; #/u%sX`#y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &/K:zWk3mx  
    { 7X \azL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ! &f(X s  
     bProcessed=TRUE; vYT%e:8)q  
    } aJ[K'5|  
   }  3z^l  
  } X2avo|6e  
  else if((lParam&0xc000ffff)==1){ //有键按下 so~vnSQ!x  
   switch(wParam) E;[ANy4L  
   { V2< 4~J2:9  
    case VK_MENU: m_{?py@tZ  
     MaskBits|=ALTBIT; . zM  
     break; OGgP~hd  
    case VK_CONTROL: Ho3$T  
     MaskBits|=CTRLBIT; 'Xl[ y  
     break; ,L iX  
    case VK_SHIFT: de.!~%D  
     MaskBits|=SHIFTBIT; %kM|Hk3d  
     break; k)VoDxMKK  
    default: //judge the key and send message k5]M~"  
     break; J&%d(EJM  
   } U%2[,c_  
   for(int index=0;index<MAX_KEY;index++){ _wa1R+`_  
    if(hCallWnd[index]==NULL) H{Zfbb  
     continue; ES~ykE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %i!&Fr  
    { &&Sl0(6x[T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {VWX?Mm  
     bProcessed=TRUE; #b[B$  
    } EZ+_*_9  
   } GEr]zMYG[A  
  } {-28%  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 P'^#I[G'  
   for(int index=0;index<MAX_KEY;index++){ &"^,Ubfcn"  
    if(hCallWnd[index]==NULL) m"MTw@}SJ;  
     continue; 9(.P2yO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4~<  :Pj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &. sfu$]  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 M" |Mte  
   } B+y r 6Q.  
  } 39s%CcI`k  
 } ifA{E}fRZP  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); yFp8 >  
} Gy*6I)l  
hhu !'(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: Isa]5>  
*ujn+0)[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `WDN T0@M  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _e/>CiN/  
-J?i6BHb  
  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: n@9*>D U  
E 9=a+l9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xngK_n  
{ $_N<! h*\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?:bW@x  
 { F\1{bN|3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 E|!rapa  
  SaveBmp(); <a@'Pcsk  
  return FALSE; ;U6z|O7L  
 } 1-.UkdZ}  
 …… //其它处理及默认处理 X|Gsf= 1S  
} e<_p\LiOS  
ocwh*t)<k  
wIi_d6?  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 2=pVX  
)*[3Imq/  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ^MPl wx  
Og8:  
  二、编程步骤 R8 1z|+c|_  
|2,'QTm=  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 0) }bJ,5/  
;M '?k8L  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Ip}(!D|  
u@v0I$  
  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; ~`Q8)(y<#$  
^cO^3=  
  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; Q`#Y_N-h+  
D]nVhOg|  
  5、 添加代码,编译运行程序。 PqMU&H_  
i*`;/x'+  
三、程序代码 w{$t:l)2,  
HbWl:yU  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL D{~mJDUzK  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9o7E/wP  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Rn={:u4  
#if _MSC_VER > 1000 jBexEdH  
#pragma once MqXN,n+`k  
#endif // _MSC_VER > 1000 SooSOOAx[  
#ifndef __AFXWIN_H__ Z/=x(I0  
#error include 'stdafx.h' before including this file for PCH Pyc/6~ ?  
#endif I~lX53D  
#include "resource.h" // main symbols (dO, +~  
class CHookApp : public CWinApp ,@2d <d]  
{ >SA?lG8f%  
 public: E]PHO\f-m}  
  CHookApp(); 7T \}nX1  
  // Overrides CrHH Ob  
  // ClassWizard generated virtual function overrides Yn ZV.&4{  
  //{{AFX_VIRTUAL(CHookApp) so h3 d  
 public: 3| 5Af  
  virtual BOOL InitInstance(); ?YR/'Vq97  
  virtual int ExitInstance(); Bor_Kib  
  //}}AFX_VIRTUAL ;hsgi|Cy-  
  //{{AFX_MSG(CHookApp) MrIo.  
  // NOTE - the ClassWizard will add and remove member functions here. |1`|E- S=  
  // DO NOT EDIT what you see in these blocks of generated code ! o ~"?K2@T  
  //}}AFX_MSG 8E`rs)A  
  DECLARE_MESSAGE_MAP() .%>UA|[~:  
}; Q8.SD p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Q5'DV!0aSv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6AgevyVG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BwO^F^Pr?k  
BOOL InitHotkey(); f`@$ saFD  
BOOL UnInit(); vluA46c  
#endif XYD}OddO  
)]Xj"V2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. V6'"J  
#include "stdafx.h" Y=JfV  
#include "hook.h" (hTe53d<S?  
#include <windowsx.h> o$I% 1  
#ifdef _DEBUG &-#!]T-P:E  
#define new DEBUG_NEW <_&H<]t%rI  
#undef THIS_FILE > t *+FcD  
static char THIS_FILE[] = __FILE__; kDuN3  
#endif il=y m  
#define MAX_KEY 100 F0 WM&{v  
#define CTRLBIT 0x04 A$G>D3  
#define ALTBIT 0x02 &CW,qY,sh  
#define SHIFTBIT 0x01 )&[S*g  
#pragma data_seg("shareddata") F3/aq+<P[  
HHOOK hHook =NULL; $fSV8n;Y  
UINT nHookCount =0; -Y'Qa/:7  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey {f] K3V  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT O:'UsI1Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey j`1% a]Bwc  
static int KeyCount =0; k mjSSh/t  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift &i*/}OZz  
#pragma data_seg() [@MV[$W5  
HINSTANCE hins; yLFc?{~7  
void VerifyWindow(); ] dB6--  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Jvt| q5  
//{{AFX_MSG_MAP(CHookApp) L2Ynv4llm  
// NOTE - the ClassWizard will add and remove mapping macros here. 7r#U^d(  
// DO NOT EDIT what you see in these blocks of generated code! -AcLh0pc  
//}}AFX_MSG_MAP ^`NU:"  
END_MESSAGE_MAP() } =Yvs)  
E/@w6uIK[  
CHookApp::CHookApp() C5;=!B  
{ .]`LR@qf  
 // TODO: add construction code here, 7a.$tT  
 // Place all significant initialization in InitInstance >h>X/a(=~  
} !kZ9Ox9^  
Rk8>Ak(/  
CHookApp theApp; a[iuE`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ur^)bp<n  
{ 8/X#thG  
 BOOL bProcessed=FALSE; q h;ahX~  
 if(HC_ACTION==nCode) 4PUSFZK?  
 { fMRBGcg7Dc  
  if((lParam&0xc0000000)==0xc0000000){// Key up dD@k{5  
   switch(wParam) *Q=ER  
   { 6tXx--Nh  
    case VK_MENU: jt-Cy  
     MaskBits&=~ALTBIT; P]A>"-k  
     break; -?gr3rV@  
    case VK_CONTROL: a]^hcKo4  
     MaskBits&=~CTRLBIT; K@lZuQ.1  
     break; nsWenf  
    case VK_SHIFT: INZycNqm,  
     MaskBits&=~SHIFTBIT; JFe %W?}.D  
     break; wb^Yg9  
    default: //judge the key and send message ^Nl)ocHv!  
     break; *het_;)+{  
   } q B-9&X  
   for(int index=0;index<MAX_KEY;index++){ M^I*;{w6i  
    if(hCallWnd[index]==NULL) ;=piJ%k  
     continue; U^<\'`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) BU-+L}-48  
    { ZzET8?8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); EMME?OW$  
     bProcessed=TRUE; ^LgaMmz  
    } X6s6fu;  
   } =~Oi:+L  
  } "5*n(S{ks  
  else if((lParam&0xc000ffff)==1){ //Key down p?S:J`q  
   switch(wParam) e R"XXF0u  
   { |r*btyOJk  
    case VK_MENU: FT'_{e!M  
     MaskBits|=ALTBIT; 6v7H?4  
     break; X^mv sY  
    case VK_CONTROL: J9J[.6k8  
     MaskBits|=CTRLBIT; /HR9(j6  
     break; 't".~H_V  
    case VK_SHIFT: Erz{{kf]1V  
     MaskBits|=SHIFTBIT; {B$cd?}  
     break; gAt[kW< n  
    default: //judge the key and send message gIv :<EJ9  
     break; [v$_BS#u^3  
   } Am=D kkP%  
   for(int index=0;index<MAX_KEY;index++) v%c r   
   { O8#}2  
    if(hCallWnd[index]==NULL) ZC+F*:$  
     continue; g7!P|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1{\{'EP{  
    { V*P3C5 l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7e$\|~<  
     bProcessed=TRUE; kGhWr M  
    } t/z]KdK P  
   } MIo5Y`T  
  } sIQd }  
  if(!bProcessed){ hYRGIpu5  
   for(int index=0;index<MAX_KEY;index++){ Ql8E9~h  
    if(hCallWnd[index]==NULL) Qp8. D4^@3  
     continue; b Z c&uq_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) sXm8KV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -FA]%Pl<'  
   } M,1Yce%+}  
  } ])paU8u  
 } Gw3eO&X3i  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); OoOKr  
} #W`>vd}  
!Irmc*;QE  
BOOL InitHotkey() 9hG)9X4  
{ jSbO1go#  
 if(hHook!=NULL){ pVe@HJy6G  
  nHookCount++; V&4)B &W  
  return TRUE; z7V74hRPX  
 } %m[ :},  
 else J0xOB;rd  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); _urv We  
  if(hHook!=NULL) ]Cy1yAv={  
   nHookCount++; ;8m_[gfw  
  return (hHook!=NULL); ypE cjVP D  
} AkdONKO8{  
BOOL UnInit() Ijq',@jE  
{ H|>dF)%pj  
 if(nHookCount>1){ q)R&npP7  
  nHookCount--; F XJI,(:-  
  return TRUE; Ys,}L.  
 } v{4K$o  
 BOOL unhooked = UnhookWindowsHookEx(hHook); xXQ#?::m  
 if(unhooked==TRUE){ a.)Gd]}g  
  nHookCount=0; lO},fM2j  
  hHook=NULL; Omo1p(y  
 } i-!Z/,oL  
 return unhooked; sxM0c  
} :Bc)1^ I  
U085qKyCw  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +T:F :X`  
{ +P,hT  
 BOOL bAdded=FALSE; #I[tsly}  
 for(int index=0;index<MAX_KEY;index++){ T'.U?G  
  if(hCallWnd[index]==0){ `9M:B&  
   hCallWnd[index]=hWnd; +jD?h-]  
   HotKey[index]=cKey; [G:wPp.y  
   HotKeyMask[index]=cMask; Y%!3/3T  
   bAdded=TRUE; g+BW~e)  
   KeyCount++; RE/'E?G  
   break; ` oN~  
  } w^tNYN,i  
 } lC&U9=7W  
 return bAdded; $/ ;:Xb=q  
} g[fCvWm#d  
[.;$6C/?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FEgM4m.(G<  
{ Ho[Kxe[c  
 BOOL bRemoved=FALSE; C;2!c  
 for(int index=0;index<MAX_KEY;index++){ O-- "\4  
  if(hCallWnd[index]==hWnd){ aW hhq@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ s6SG%Vd  
    hCallWnd[index]=NULL; e$>.x< Eq  
    HotKey[index]=0; %lPAq  
    HotKeyMask[index]=0; _YzItge*  
    bRemoved=TRUE; HHu|X`tc  
    KeyCount--; FyYD7E  
    break; {>[,i`)  
   } :9H=D^J  
  } f?: o  
 } fis**f0  
 return bRemoved; 2= FGZa*.  
} fk-zT  
1<a+91*=e  
void VerifyWindow() 8 _0j^oh  
{ wN/d J  
 for(int i=0;i<MAX_KEY;i++){ 1iBOf8  
  if(hCallWnd!=NULL){ 5Z{i't0CQ  
   if(!IsWindow(hCallWnd)){ u'cM}y&  
    hCallWnd=NULL; [ L% -lJ  
    HotKey=0; jSVIO v:  
    HotKeyMask=0; ]S+NH[g+  
    KeyCount--; HJ[@;F|aU  
   } 4UD7!  
  } >mRA|0$  
 } to~Ap=E  
} 6QVdnXoG/  
)G6{JL-I  
BOOL CHookApp::InitInstance() UD1R _bL}  
{ ~oO>6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); xaQ]Vjw  
 hins=AfxGetInstanceHandle(); ("UcjB^62  
 InitHotkey(); "w ] Bq0  
 return CWinApp::InitInstance(); R,[ dEP  
} lN$#lyy  
Dd8*1,  
int CHookApp::ExitInstance() (xw)pR  
{ /Zw^EM6c  
 VerifyWindow(); 3'WJx=0?  
 UnInit(); l;^Id#N  
 return CWinApp::ExitInstance(); :'RmT3  
} EGWm0 F_  
nDx}6}5)  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file <PL94  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) SwHrHj  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c?oNKqPzg  
#if _MSC_VER > 1000 |fX @o0H  
#pragma once 6$-Ex  
#endif // _MSC_VER > 1000 t-_~jZ<  
0~{jgN~  
class CCaptureDlg : public CDialog "IbXKS>t  
{ M:V'vme)+  
 // Construction @{16j# 'R  
 public: 9xL8 ];-  
  BOOL bTray; M3- bFIt  
  BOOL bRegistered; F|\^O[#R  
  BOOL RegisterHotkey(); x*GGO)r  
  UCHAR cKey; nxH+XHv  
  UCHAR cMask; KS%LXc('  
  void DeleteIcon(); 3>FeTf#:  
  void AddIcon(); QiBo]`)%  
  UINT nCount; n$B SO  
  void SaveBmp(); ';"W0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor %D|p7&  
  // Dialog Data  ,r\  
  //{{AFX_DATA(CCaptureDlg) O ;,BzA-n  
  enum { IDD = IDD_CAPTURE_DIALOG }; :%ms6j/B&V  
  CComboBox m_Key; Sx{vZS3  
  BOOL m_bControl; J8Bz|.@Q  
  BOOL m_bAlt; L{_Q%!h3]  
  BOOL m_bShift; _7df(+.{<A  
  CString m_Path; Tjba @^T  
  CString m_Number; 7=yV8.cD  
  //}}AFX_DATA Zd$a}~4~  
  // ClassWizard generated virtual function overrides ,h1 z8.wD|  
  //{{AFX_VIRTUAL(CCaptureDlg) feg  
 public: !DgN@P.o  
  virtual BOOL PreTranslateMessage(MSG* pMsg); o%dKi]  
 protected: D"kss5>w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C+ \c(M a  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); UYJMW S=  
  //}}AFX_VIRTUAL u0^Vy#@_  
  // Implementation TC7&IqT  
 protected: 7Gg3$E+#*  
  HICON m_hIcon; B->3/dp2c'  
  // Generated message map functions )BI6nU  
  //{{AFX_MSG(CCaptureDlg) QN`K|,}H^  
  virtual BOOL OnInitDialog(); 1.p2{  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); g \]2?vY.  
  afx_msg void OnPaint(); WE;QEA/  
  afx_msg HCURSOR OnQueryDragIcon(); MDkcG"O  
  virtual void OnCancel(); _XLGXJ[B  
  afx_msg void OnAbout(); J^t-pU  
  afx_msg void OnBrowse(); UQZ<sp4v;  
  afx_msg void OnChange(); CJ+/j=i;~c  
 //}}AFX_MSG iZsZSW \  
 DECLARE_MESSAGE_MAP() ^e*Tg&  
}; L9(mY `d>"  
#endif cE (P^;7D  
9i+OYWUO  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Cq mtO?vne  
#include "stdafx.h" 'T G43^  
#include "Capture.h" }G8gk"st  
#include "CaptureDlg.h" VRe7Q0  
#include <windowsx.h> FDfLPCQm  
#pragma comment(lib,"hook.lib") o< )"\f/,  
#ifdef _DEBUG SrlTwcD  
#define new DEBUG_NEW &>Zm gz  
#undef THIS_FILE 1< gY  
static char THIS_FILE[] = __FILE__; \<k5c-8Hb  
#endif gumT"x .^  
#define IDM_SHELL WM_USER+1 3$<u3Zi6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  UZJ^ e$N  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L'1!vu *Rg  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s2SxMFDP  
class CAboutDlg : public CDialog q [}<LU  
{ %H)^k${  
 public: `6bIxb{  
  CAboutDlg(); awYnlE/Z1  
  // Dialog Data _p;>]0cc.  
  //{{AFX_DATA(CAboutDlg) L!:8yJK  
  enum { IDD = IDD_ABOUTBOX }; {J#SpG 7  
  //}}AFX_DATA 0j{Rsy   
  // ClassWizard generated virtual function overrides =K#5I<x  
  //{{AFX_VIRTUAL(CAboutDlg) Q,pnh!.-c  
 protected: "==fWf  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =rL%P~0wq  
  //}}AFX_VIRTUAL W4MU^``   
  // Implementation `<Ry_}V  
 protected: EJAk'L+nuH  
  //{{AFX_MSG(CAboutDlg) S F:>dneB  
  //}}AFX_MSG il8n K  
  DECLARE_MESSAGE_MAP() ,|5|aVfh  
}; Ez()W,6]g  
]iI2  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) f\p#3IwwH  
{ }%^N9AA8  
 //{{AFX_DATA_INIT(CAboutDlg) dWc'RwL  
 //}}AFX_DATA_INIT oRDqN]  
} CjFnE   
`!BP.-Zv  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) FX1[ 2\  
{ pCacm@(hG  
 CDialog::DoDataExchange(pDX); ~&}e8ah2  
 //{{AFX_DATA_MAP(CAboutDlg) CG[2  
 //}}AFX_DATA_MAP {C>E*qp}f  
} Mz59ac  
azK7kM~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?nf!s J'm  
 //{{AFX_MSG_MAP(CAboutDlg) =6.4  
 // No message handlers /)+V(Jlu  
 //}}AFX_MSG_MAP T`ofj7$:  
END_MESSAGE_MAP() G 6r2 "  
Jy^.L$bt  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .ei5+?V<i  
: CDialog(CCaptureDlg::IDD, pParent) <cof   
{ $O'IbA  
 //{{AFX_DATA_INIT(CCaptureDlg) ;!~&-I0l  
  m_bControl = FALSE; Z]~) ->=}  
  m_bAlt = FALSE; %XC3V7  
  m_bShift = FALSE; 5>Kk>[|.  
  m_Path = _T("c:\\"); }Qu kn  
  m_Number = _T("0 picture captured."); &':Ecmo~`  
  nCount=0; mJU1n  
  bRegistered=FALSE; 4Tdp;n\F  
  bTray=FALSE; Mg"e$m  
 //}}AFX_DATA_INIT ,1K`w:uhS  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 _O,k0O   
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Q[n*ce7L0  
} }Fq~!D Ee  
f (Su  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) e 48N[p  
{ R:+cumHr  
 CDialog::DoDataExchange(pDX); Be$v%4  
 //{{AFX_DATA_MAP(CCaptureDlg) rv?4S`Z,x$  
  DDX_Control(pDX, IDC_KEY, m_Key); luWr.<1  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); urbSprdF  
  DDX_Check(pDX, IDC_ALT, m_bAlt); TCWt3\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >%\&tS'  
  DDX_Text(pDX, IDC_PATH, m_Path); M*gbA5  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ln1!%B;  
 //}}AFX_DATA_MAP v\Y8+dD  
} zJ*(G_H  
9$q35e  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) j LM}hwJ8  
//{{AFX_MSG_MAP(CCaptureDlg) ` n#Db  
 ON_WM_SYSCOMMAND() '< .gKo  
 ON_WM_PAINT() {j8M78}3  
 ON_WM_QUERYDRAGICON() [4 v1 N  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) yM2}J s C  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) w}qLI4  
 ON_BN_CLICKED(ID_CHANGE, OnChange) cjp~I/U  
//}}AFX_MSG_MAP C0gY  
END_MESSAGE_MAP() agGgj>DDd  
8=MNzcA }  
BOOL CCaptureDlg::OnInitDialog() ,,c+R?D  
{ ?E}9TQ  
 CDialog::OnInitDialog(); -UoTBvObAm  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]r\FC\n6e  
 ASSERT(IDM_ABOUTBOX < 0xF000); :Tcvj5  
 CMenu* pSysMenu = GetSystemMenu(FALSE); BUs={"Pa  
 if (pSysMenu != NULL) kBeYl+*pk  
 { Y@y"bjK \  
  CString strAboutMenu; l`<1Y|  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ^)p+)5l   
  if (!strAboutMenu.IsEmpty()) ;XIDu6  
  { IZ_?1%q>}  
   pSysMenu->AppendMenu(MF_SEPARATOR); O))YJh"'_  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #&}j'oD|N  
  } XW.k%H4@  
 } Nu;?})tF  
 SetIcon(m_hIcon, TRUE); // Set big icon HcQ)XJPK  
 SetIcon(m_hIcon, FALSE); // Set small icon QJy1j~9x  
 m_Key.SetCurSel(0); 2,6~;R  
 RegisterHotkey(); 0N87G}Xu  
 CMenu* pMenu=GetSystemMenu(FALSE); mUNAA[0 L  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); XI+GWNAmJ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Y#t9DhzFWo  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); SE$~Wbj?  
 return TRUE; // return TRUE unless you set the focus to a control /.WIED}>  
} az1#:Go  
K (,MtY*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) _Ie?{5$ng`  
{ qi*Dd[OG  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) &n'@L9v81  
 { IhHKRb[  
  CAboutDlg dlgAbout; RT. %\)))  
  dlgAbout.DoModal(); Alk+MwjR  
 } `t"7[Zk  
 else f>iDq C4  
 { cE^Ljk  
  CDialog::OnSysCommand(nID, lParam); L0)w~F ?m  
 } %Jji<M]  
} fuU 3?SG  
Z*+y?5+L"P  
void CCaptureDlg::OnPaint() Z<iK(?@O  
{ .L~ NX/V  
 if (IsIconic()) dsn(h5,Q'  
 { ,<BV5~T.|  
  CPaintDC dc(this); // device context for painting -W{ !`<8D  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6j Rewj  
  // Center icon in client rectangle q2P_37  
  int cxIcon = GetSystemMetrics(SM_CXICON); PJO.^OsM  
  int cyIcon = GetSystemMetrics(SM_CYICON); tlM >=s'T  
  CRect rect; TkR#Kzv380  
  GetClientRect(&rect); cGyR_8:2cv  
  int x = (rect.Width() - cxIcon + 1) / 2; Nwo*tb:  
  int y = (rect.Height() - cyIcon + 1) / 2; +|--}iE5n  
  // Draw the icon X%$1%)C9  
  dc.DrawIcon(x, y, m_hIcon); vaLP_V  
 } vScEQS$>  
 else n/{ pQ&B  
 { V aoqI  
  CDialog::OnPaint(); ,A5}HRW%  
 } i#aKW'  
} o)GesgxFa5  
#w@FBFr@  
HCURSOR CCaptureDlg::OnQueryDragIcon() |\Q2L;4C  
{ {PkR6.XhR  
 return (HCURSOR) m_hIcon; Rk-G| 52g  
} zE Ly1v\"  
A34O(fE  
void CCaptureDlg::OnCancel() -,Js2+QZ#  
{ ~z(0XKq0d  
 if(bTray) r PTfwhs  
  DeleteIcon(); $Xh5N3  
  CDialog::OnCancel(); 0 ;].q*|#  
} <MKX F V  
!>N+a3   
void CCaptureDlg::OnAbout() kCALJRf~d  
{ "=ki_1/P  
 CAboutDlg dlg; QUm[7<"  
 dlg.DoModal(); 1(pv 3  
} rp4{lHw>C/  
aCJ-T8?'  
void CCaptureDlg::OnBrowse() @ULd~  
{ (-],VB (+  
 CString str; IR{XL\WF  
 BROWSEINFO bi; [ahwJF#r  
 char name[MAX_PATH]; K_n GZ/`[  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  9I:3  
 bi.hwndOwner=GetSafeHwnd(); iaJLIrl  
 bi.pszDisplayName=name; O)ose?Z  
 bi.lpszTitle="Select folder"; AV4fN@BX  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; XSCcumde!  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @ M4m!;rM  
 if(idl==NULL) M~h.M PI  
  return; A)gSOC{3F)  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .mNw^>:cq  
 str.ReleaseBuffer(); oVr:ZwkG3  
 m_Path=str; ;<*USS6X  
 if(str.GetAt(str.GetLength()-1)!='\\') III:j hh  
  m_Path+="\\"; ">M&/}4  
 UpdateData(FALSE); 3ZN\F  
} ]9~Il#  
P+y XC^ ,  
void CCaptureDlg::SaveBmp() >oN Wf  
{  7|yEf  
 CDC dc; BnfuI  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); V(XZ7<& {  
 CBitmap bm; ^G 'n z  
 int Width=GetSystemMetrics(SM_CXSCREEN); *8+HQ[[#  
 int Height=GetSystemMetrics(SM_CYSCREEN); "bB0$>0,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); %QQ 2u$  
 CDC tdc; >4q6  
 tdc.CreateCompatibleDC(&dc); `EfFyhG$  
 CBitmap*pOld=tdc.SelectObject(&bm); u9(42jj[$U  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $=X>5B  
 tdc.SelectObject(pOld); 0>46ZzxUZ  
 BITMAP btm; `e`DSl D>  
 bm.GetBitmap(&btm); ,hr v  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; "Ec9.#U/  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); c[V.j+Iy#^  
 BITMAPINFOHEADER bih; ]rSg,Q >E  
 bih.biBitCount=btm.bmBitsPixel; YNl".c  
 bih.biClrImportant=0; (.iwD&  
 bih.biClrUsed=0; sIbPMu`&U  
 bih.biCompression=0; O)DAYBv^  
 bih.biHeight=btm.bmHeight; _;%l~q/  
 bih.biPlanes=1; x}O,xquY  
 bih.biSize=sizeof(BITMAPINFOHEADER); R+t]]n6#  
 bih.biSizeImage=size; `mI5Z*]-  
 bih.biWidth=btm.bmWidth; 8GRB6-.h  
 bih.biXPelsPerMeter=0; \3] O?'  
 bih.biYPelsPerMeter=0; $BT[fJ'k  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); GIT"J}b}  
 static int filecount=0; HO_(it \  
 CString name; ?Q$a@)x#  
 name.Format("pict%04d.bmp",filecount++); Q/]o'_[vW  
 name=m_Path+name; GY %$7   
 BITMAPFILEHEADER bfh; @4Zkkjc4b  
 bfh.bfReserved1=bfh.bfReserved2=0; Pd& Npp3  
 bfh.bfType=((WORD)('M'<< 8)|'B'); R^=v&c{@  
 bfh.bfSize=54+size; ay| |yn:  
 bfh.bfOffBits=54; hrO9_B|#  
 CFile bf; {LVA_7@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ BJ\81 R  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); WMW=RgiW\  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); '/9q7?[E!  
  bf.WriteHuge(lpData,size); ;;m;f^]}  
  bf.Close(); D SWmQQ  
  nCount++; ?Ok&,\F@E  
 } {-Mjs BR  
 GlobalFreePtr(lpData); fFoZ! H  
 if(nCount==1) `KE]RTq  
  m_Number.Format("%d picture captured.",nCount); I<XYLe[_S  
 else I-1NZgv  
  m_Number.Format("%d pictures captured.",nCount); SjY|aW+wAL  
  UpdateData(FALSE); )m[<lJ bw  
} QoZZXCU  
s&'FaqE  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) | lZJt  
{ Fa\jVFIQ  
 if(pMsg -> message == WM_KEYDOWN) ?Z4%u8Krvz  
 { Vy|4k2  
  if(pMsg -> wParam == VK_ESCAPE) Rry] 6(  
   return TRUE; -rjQ^ze  
  if(pMsg -> wParam == VK_RETURN) AlG5n'  
   return TRUE; i~AReJxt7  
 } VXlAK(   
 return CDialog::PreTranslateMessage(pMsg); lzz;L z  
} )v11j.D  
pq\N 2d  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ASrRMH[  
{ qJf\,7mi  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ h{H*k#>  
  SaveBmp(); -'L~Y~'.  
  return FALSE; ,Vo[mB  
} H3`.Y$z  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~'0ZW<X.  
 CMenu pop; )n 1[#x^I  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )''V}Zn.X  
 CMenu*pMenu=pop.GetSubMenu(0); RHpjJZUV  
 pMenu->SetDefaultItem(ID_EXITICON); R*FDg;t4  
 CPoint pt; C"mWO Y2]  
 GetCursorPos(&pt); lN8l71N^  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1 ?Zw  
 if(id==ID_EXITICON) kM1N4N7  
  DeleteIcon(); Cz$q"U  
 else if(id==ID_EXIT) Lfdg5D5.P  
  OnCancel(); ij~-  
 return FALSE; S0gxVd(  
} h^qZi@L  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); F u^j- Io  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) b62B|0i  
 AddIcon(); Ctn?O~u  
 return res; &l!T2PX!  
} olA+B  
C^;8M'8z0  
void CCaptureDlg::AddIcon() L;y BZLM  
{ Ewq@>$_!  
 NOTIFYICONDATA data; wHQ$xO;vD'  
 data.cbSize=sizeof(NOTIFYICONDATA); =au!rda  
 CString tip; 6Z' K1  
 tip.LoadString(IDS_ICONTIP); ?G!~&  
 data.hIcon=GetIcon(0); ?8?vBkz~  
 data.hWnd=GetSafeHwnd(); c0rU&+:Ry  
 strcpy(data.szTip,tip); ~:U`^wtQ  
 data.uCallbackMessage=IDM_SHELL; -Ah&|!/  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2eeFaFif  
 data.uID=98; x Gbq,~_r  
 Shell_NotifyIcon(NIM_ADD,&data); ^,t@HN;gA  
 ShowWindow(SW_HIDE); GUqG1u z9  
 bTray=TRUE; Rg\4#9S JF  
} nf<I  
)8eb(!}7  
void CCaptureDlg::DeleteIcon() @Tq-3Um  
{ Lj#xZ!mQS  
 NOTIFYICONDATA data; qO8:|q1%;\  
 data.cbSize=sizeof(NOTIFYICONDATA); V/#J>-os}W  
 data.hWnd=GetSafeHwnd(); Iz j-,a  
 data.uID=98; e8wPEDN*4  
 Shell_NotifyIcon(NIM_DELETE,&data); SdYb T)y  
 ShowWindow(SW_SHOW); bu<d>XR  
 SetForegroundWindow(); oWLP|c~ Ap  
 ShowWindow(SW_SHOWNORMAL); #gT"G18/!  
 bTray=FALSE; NWPT89@l  
} n-],!pL^  
? daxb  
void CCaptureDlg::OnChange() TF5jTpGq  
{ o|y_j4 9  
 RegisterHotkey(); H_t0$x(\  
} vr{|ubG]d  
$w <R".4  
BOOL CCaptureDlg::RegisterHotkey() QRrAyRf[  
{ %8%|6^,  
 UpdateData(); %#~wFW|]x  
 UCHAR mask=0; CDXN%~0h  
 UCHAR key=0; T0"nzukd  
 if(m_bControl) >3B {sn}  
  mask|=4; 7CSz  
 if(m_bAlt) :@"o.8p   
  mask|=2; Hm!"%  
 if(m_bShift) ;~djbo0,X  
  mask|=1; Uf ]$I`T#  
  key=Key_Table[m_Key.GetCurSel()]; nTD%i~t~o  
 if(bRegistered){ 2p#d  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); &z5?]`ALu  
  bRegistered=FALSE; 1%R${Qhr  
 } D.%%D%AdB  
 cMask=mask; &!O?h/&X3  
 cKey=key; ZWGX*F#}P  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (VI(Nv:o@  
 return bRegistered; Jr;w>8B),  
} )\VuN-d  
sJ^Ff  
  四、小结 -64 ;P9:A>  
'[%Pdd]! E  
  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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