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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: 5N%93{L  
  U2uF&6v  
  一、实现方法 @-UL`+  
.>Ljnk  
  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: a=M\MZK>  
;"(foY"L  
#pragma data_seg("shareddata") Wu4Lxv]B4  
HHOOK hHook =NULL; //钩子句柄 I%- " |]$  
UINT nHookCount =0; //挂接的程序数目 t]7&\ihZi~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4`JH&))}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 iw*Nq,(  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey afYc\-"  
static int KeyCount =0; J7r|atSk  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Neg,qOt  
#pragma data_seg() !9Aaj<yxm  
T&Lb<'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。 vAyFmdJ^  
CPNL 94x  
  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: >3z5ww  
&u#&@J  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR pdE3r$C  
cKey,UCHAR cMask) ?LvCR_D:  
{ zZVfj:i8  
 BOOL bAdded=FALSE; z dO#0t N  
 for(int index=0;index<MAX_KEY;index++){ PRz/inru-  
  if(hCallWnd[index]==0){ _YcA+3ZL  
   hCallWnd[index]=hWnd; @|Rrf*J?%  
   HotKey[index]=cKey; ^f# F I&  
   HotKeyMask[index]=cMask; os/vtyP:a  
   bAdded=TRUE; [IK  )  
   KeyCount++; R: l&2k@  
   break; V}\~ugN)y  
  } @}u9Rn*d;  
 } **}h&k&%2  
 return bAdded; ,3@#F/c3i~  
} In`mtn q  
//删除热键 ]Kr `9r),  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4~B> 9<$e>  
{ 6R=W}q4  
 BOOL bRemoved=FALSE; Q+YRf3$  
 for(int index=0;index<MAX_KEY;index++){ 7b<yVP;{  
  if(hCallWnd[index]==hWnd){ ULQMG'P^D  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hWX% 66  
    hCallWnd[index]=NULL; \Gc+WpS(  
    HotKey[index]=0; Z)jw|T'X  
    HotKeyMask[index]=0; {mAU3x  
    bRemoved=TRUE; HuOIFv  
    KeyCount--; 66fO7OJs  
    break; ~8lwe*lNV  
   } r/SG 4  
  } _-EyT  
 } 3YVi" k?2  
 return bRemoved; -|E!e.^7:  
} ;VWAf;U;B  
$sEy%-  
'Fmvu   
  DLL中的钩子函数如下: o<N  nV  
EVoE szR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TYy.jFT-  
{ {?yr'*  
 BOOL bProcessed=FALSE; 6L)%T02C  
 if(HC_ACTION==nCode) s0PrbL%_`  
 { ^Vpq$'!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 i9/aAH0  
   switch(wParam) b#X^=n2  
   {  >Q(3*d >  
    case VK_MENU: >yULC|'F&~  
     MaskBits&=~ALTBIT; 3`k;a1Z#O'  
     break; {~F4WjHJp  
    case VK_CONTROL: B[KJR?>  
     MaskBits&=~CTRLBIT; aoXb22]{  
     break; B'fb^n<  
    case VK_SHIFT: l,kUhZ@W  
     MaskBits&=~SHIFTBIT; 5O\*h;U 6  
     break; lyGhdgWc  
    default: //judge the key and send message a[ex[TRKe  
     break; ,G2TVjz  
   } 2sJ(awN>  
   for(int index=0;index<MAX_KEY;index++){ 92 [; Y  
    if(hCallWnd[index]==NULL) 3\B>lKhQ  
     continue; 2RX!V@z.G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sQ fFu  
    { L31HG H2l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8?%-'z.  
     bProcessed=TRUE; 7x@A%2J  
    } YxP&7oq  
   } 7(5 4/  
  } Z:*76PP,  
  else if((lParam&0xc000ffff)==1){ //有键按下 <N%7|t*eT  
   switch(wParam) !TUrQ  
   { R=|{n'n$0|  
    case VK_MENU: ;1a~pF S  
     MaskBits|=ALTBIT; !1ED~3 /X  
     break; Z /9>  
    case VK_CONTROL: CO`_^7o9(  
     MaskBits|=CTRLBIT; t]YC"%[S  
     break; 0|a(]a}V*j  
    case VK_SHIFT: '#&os`mQ  
     MaskBits|=SHIFTBIT; T3^GCX|!@  
     break; ^_f+15]D  
    default: //judge the key and send message + ~>Aj  
     break; `b^Ru+(dM  
   } CY"/uSB  
   for(int index=0;index<MAX_KEY;index++){ & 9<+;*/  
    if(hCallWnd[index]==NULL) w'm;82V:P-  
     continue; &sU?Ok6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w'UVKpG+  
    { {QwHc5Bf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @0F3$  
     bProcessed=TRUE; ?nmn1`UT  
    } PBp^|t]E>  
   } q,+yqrt  
  } eN^qG 42  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 43@{JK9G  
   for(int index=0;index<MAX_KEY;index++){ /\hzb/  
    if(hCallWnd[index]==NULL) HbxL:~:}J  
     continue; |g//g\dd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) | y2w9n0D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); k@'#@ t  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 s mnS DS  
   } oIduxbAp  
  } ,.7*Hpa  
 } lb3]$Da  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); urjjw.wZ  
} 0`[wpZ  
 m5r7  
  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: lQe%Yh >rl  
sL\L"rQN6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lhBT@5Dm9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pNKhc#-w  
#n#@fAY  
  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: /|D*w^ >  
Ym =FgM\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3yB!M  
{ J%,*is EL  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) |563D#?cR  
 { o*o/q],C9-  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 GhIKvX_N  
  SaveBmp(); SgS~ {4Zx*  
  return FALSE; Mw;sLsu  
 } 2u5|8  
 …… //其它处理及默认处理 i*@< y/&'  
} iT%} $Lu~  
yc?a=6q'm  
K5xX)oV  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 orjj' +;X  
LyAn&h}  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ce7CcHQ?B  
Yo|,]X>/  
  二、编程步骤 <c2'0I >  
Z\k&gio5C^  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; \Hn>oonph  
\Ol kM<  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; _t Yx~J2.Q  
;N 0~;I  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; yge,8i)c  
{o.FlX  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; U 15H2-`  
<|SRe6m  
  5、 添加代码,编译运行程序。 'LO^<  
:gep:4&u  
三、程序代码 2fWTY0  
-(~!Jo_*'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "-vW,7y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) f PM8f  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ x3o ]U)^  
#if _MSC_VER > 1000 EV*IoE$W]=  
#pragma once d%V*|0c)  
#endif // _MSC_VER > 1000 tF{D= ;G  
#ifndef __AFXWIN_H__ /assq+H  
#error include 'stdafx.h' before including this file for PCH {/ BT9|LI  
#endif "gDb1h)8  
#include "resource.h" // main symbols =*r]) Vg^  
class CHookApp : public CWinApp CnG+Mc^  
{ 3_MS.iM  
 public: i? K|TC`  
  CHookApp(); =5(>q5Z*  
  // Overrides @tZ&2RY1  
  // ClassWizard generated virtual function overrides '|Kmq5)  
  //{{AFX_VIRTUAL(CHookApp) "O%gFye  
 public: wfq7ob4^  
  virtual BOOL InitInstance(); %)0*&a 4  
  virtual int ExitInstance(); O8j_0  
  //}}AFX_VIRTUAL NbU[l  
  //{{AFX_MSG(CHookApp) TjwBv6h  
  // NOTE - the ClassWizard will add and remove member functions here. F)'.g d  
  // DO NOT EDIT what you see in these blocks of generated code ! JNJ=e,O,  
  //}}AFX_MSG e-"nB]n^/  
  DECLARE_MESSAGE_MAP() H?)w!QX  
}; Na?!;1]_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); RM!<8fXYD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |4uWh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )C(? bR  
BOOL InitHotkey(); &I (#Wy3  
BOOL UnInit(); hNH'XQxO  
#endif rjp-Fw~1w  
!U'QqnT  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. L_wk~z  
#include "stdafx.h" nh!a)]c[  
#include "hook.h" '8{N e!y  
#include <windowsx.h> -\ EP.Vtz  
#ifdef _DEBUG +/)#( j@  
#define new DEBUG_NEW S|]X'f  
#undef THIS_FILE b-{=s +:  
static char THIS_FILE[] = __FILE__; (4dhuT  
#endif h3z{(-~y  
#define MAX_KEY 100 \<y#R~7s  
#define CTRLBIT 0x04 ?MgUY)X  
#define ALTBIT 0x02 \\u<S=G  
#define SHIFTBIT 0x01 S&b*rA02zp  
#pragma data_seg("shareddata") \4-"L>  
HHOOK hHook =NULL; OeS\7  
UINT nHookCount =0;  ng_^  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey y*tZ !m2Gg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT C ihAU"  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /p+>NZ"b  
static int KeyCount =0; ~1W x =  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift }}>q2y  
#pragma data_seg() 32/MkuY^u  
HINSTANCE hins; DW_1,:,?7l  
void VerifyWindow(); }L#_\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) r0,:J   
//{{AFX_MSG_MAP(CHookApp) F pa_qjL;  
// NOTE - the ClassWizard will add and remove mapping macros here. :F{:Z*Fi0  
// DO NOT EDIT what you see in these blocks of generated code! ;I}kQ!q  
//}}AFX_MSG_MAP q(.:9A*0  
END_MESSAGE_MAP() b;cdIl!3  
C0}IE,]  
CHookApp::CHookApp() bdF.qO9  
{ /$'AjIg4:&  
 // TODO: add construction code here, 3~ S8!nx  
 // Place all significant initialization in InitInstance EioB%f3  
} g'V>_u#(  
-1U D0(  
CHookApp theApp; hR Ue<0o:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fi$-;Gz  
{ |,!IZ- th  
 BOOL bProcessed=FALSE; 8$;=Uf,x  
 if(HC_ACTION==nCode) ]2\VweV  
 { 79xx2  
  if((lParam&0xc0000000)==0xc0000000){// Key up EodQ*{l  
   switch(wParam) '{ V0M<O  
   { ?Vf o+a,  
    case VK_MENU: N =QfP  
     MaskBits&=~ALTBIT; Y! gCMLL  
     break; b7wvaRe.  
    case VK_CONTROL: V&\[)D'c  
     MaskBits&=~CTRLBIT; +(1zH-^.  
     break; )XzI #iQ  
    case VK_SHIFT: X  .5aMm  
     MaskBits&=~SHIFTBIT; }#Qc \eud  
     break; aW`Lec{.  
    default: //judge the key and send message Gq }U|Z  
     break; =aoMii   
   } viMzR(JU  
   for(int index=0;index<MAX_KEY;index++){ HFaj-~b  
    if(hCallWnd[index]==NULL) "huFA|`  
     continue; dK2p7xo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4*cU<  
    { #[`:'e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KNLfp1!  
     bProcessed=TRUE; ,H19`;Q  
    } G6FEp`  
   } Dqe^E%mc  
  } :"I E  
  else if((lParam&0xc000ffff)==1){ //Key down \8 h;K>=h  
   switch(wParam) eK!V );  
   { IuRmEL_Q_  
    case VK_MENU: y10h#&k  
     MaskBits|=ALTBIT; ~ y;6W0x  
     break; ?Vdia:  
    case VK_CONTROL: 52,m:EhL  
     MaskBits|=CTRLBIT; 0 SNIYkGE  
     break; I{*<4a7q  
    case VK_SHIFT: x"{'&J[hx  
     MaskBits|=SHIFTBIT; 2h=!k|6  
     break; MvWaB  
    default: //judge the key and send message x`dHJq`_g  
     break; FTQ%JTgT  
   } km1~yQ"bH  
   for(int index=0;index<MAX_KEY;index++) lAJxr8 .  
   { (3 #Cl 1]f  
    if(hCallWnd[index]==NULL) 4W)B'+ZK8  
     continue; ^n"OL*ipG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Bxfc}vC.  
    { %ve:hym*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :9_L6  
     bProcessed=TRUE; |Clut~G  
    } f' aVV!  
   } HsHB!mQV  
  } j.L-{6_s>~  
  if(!bProcessed){ Ffv`kn@  
   for(int index=0;index<MAX_KEY;index++){ PUBWZ^63  
    if(hCallWnd[index]==NULL) -!N&OZ+R   
     continue; 0 Emr<n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q"<acqK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (Xq)py9  
   } )Ib<F 7v  
  } *i- _6s  
 } r;Gi+Ca5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7qg{v9|,  
} ]jaQ[g$F  
P3nb2.  
BOOL InitHotkey() N.]qU d  
{ 8qu2iPOcZ  
 if(hHook!=NULL){ }= 6'MjF]  
  nHookCount++; 0VGPEKRh  
  return TRUE; L_+k12lm  
 } k'IYA#T6  
 else R@6zGZ1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); jlBanGs?  
  if(hHook!=NULL) i]|Yg$  
   nHookCount++; we;G]`@?  
  return (hHook!=NULL); ,XIz?R>;c  
} xg NJeQ  
BOOL UnInit() K,bo VFs  
{ |&[L?  
 if(nHookCount>1){ 5c^Z/ Jl$c  
  nHookCount--; u a~CEs  
  return TRUE; 5KDGSo  
 } ""1^k2fj  
 BOOL unhooked = UnhookWindowsHookEx(hHook); CFqJ/ ''  
 if(unhooked==TRUE){ "E8zh|m o  
  nHookCount=0; J]G?Rc  
  hHook=NULL; 2cqI[t@0  
 } x7<\] 94  
 return unhooked; =}v}my3y"  
} L2pp6bW  
)d$glI+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H N.3  
{ u\LFlX0sO  
 BOOL bAdded=FALSE; q|v(Edt|_[  
 for(int index=0;index<MAX_KEY;index++){ ]"1`+q6i  
  if(hCallWnd[index]==0){ I-WhH>9  
   hCallWnd[index]=hWnd; 0em#-*|2"  
   HotKey[index]=cKey; YR>B_,Gl  
   HotKeyMask[index]=cMask; B,K>rCZ/  
   bAdded=TRUE; -#2)?NkeE  
   KeyCount++; spGB)k,^  
   break; yI ld75S`  
  } (A?H1 9  
 } E 2"q3_,,  
 return bAdded; fVt9X*xK S  
} t7m>A-I  
|pmZ.r  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LwK+:4$  
{ &/uu)v  
 BOOL bRemoved=FALSE; &%s8L\?  
 for(int index=0;index<MAX_KEY;index++){ P4F3Dc  
  if(hCallWnd[index]==hWnd){ ;B?DfWX  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ zD(`B+  
    hCallWnd[index]=NULL; H~+l7OhV  
    HotKey[index]=0; awOd_![c'  
    HotKeyMask[index]=0; mFSw@CC  
    bRemoved=TRUE; 0\:(ageY?  
    KeyCount--; )EL!D%<A  
    break; >layJt  
   } +> WM[o^I  
  } AwTJJ0>  
 } \uXcLhXN  
 return bRemoved; j~+>o[c  
} g-e #!(  
XP1~d>j  
void VerifyWindow() @~#Ym1{W  
{ ooV3gj4  
 for(int i=0;i<MAX_KEY;i++){ `X`2:@gQ  
  if(hCallWnd!=NULL){ E[*Fz1>  
   if(!IsWindow(hCallWnd)){ >2Jdq  
    hCallWnd=NULL; +=mkCU  
    HotKey=0; Y;e,Gq`  
    HotKeyMask=0; sz)oZPu|  
    KeyCount--; 2con[!U  
   } m <w "T7  
  } Ojt`^r!V  
 }  wAz&"rS  
} qR8u$2}NY  
+{/*z  
BOOL CHookApp::InitInstance() s7l;\XBy  
{ a9T@$:  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Ma\Gb+>  
 hins=AfxGetInstanceHandle(); e+j)~RBnu3  
 InitHotkey(); \N4 y<  
 return CWinApp::InitInstance(); u&9 r2R959  
} ]\xy\\b/`  
]_8qn'7  
int CHookApp::ExitInstance() i@B[ eta  
{ ~>:Z6Le@   
 VerifyWindow(); h?f>X"*|(  
 UnInit(); MUA%^)#u4Q  
 return CWinApp::ExitInstance(); gt ";2,;X  
} Q\WC+,_%  
DF g,Xa#  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file h^*4}GU  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 2l F>1vH  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2Y>~k{AN%  
#if _MSC_VER > 1000 $YXMI",tt<  
#pragma once kdCP  
#endif // _MSC_VER > 1000  (:";i&  
`KCh*i  
class CCaptureDlg : public CDialog Da v PYg  
{ d5>H3D{49  
 // Construction (C\hVy2X?N  
 public: jC3Vbm&ZZ  
  BOOL bTray; P{5-Mx!{&  
  BOOL bRegistered; 6}(J6T46M[  
  BOOL RegisterHotkey(); p<&Xd}]"^W  
  UCHAR cKey; @0eHS +  
  UCHAR cMask; A)~X,  
  void DeleteIcon(); E%'~'[Q  
  void AddIcon(); qBQ`~4s  
  UINT nCount; XgxX.`H7  
  void SaveBmp(); 4_UU<GEp  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor `D":Q=:  
  // Dialog Data |8.(XsN  
  //{{AFX_DATA(CCaptureDlg) t2V0lyeL  
  enum { IDD = IDD_CAPTURE_DIALOG }; \y88d4zX  
  CComboBox m_Key; a3VM '  
  BOOL m_bControl; 8NU`^L:1  
  BOOL m_bAlt; $rhgzpZ!X_  
  BOOL m_bShift; e{A9r@p!  
  CString m_Path; +MB!B9M@  
  CString m_Number; #!9S}b$  
  //}}AFX_DATA Kv@e I$t5  
  // ClassWizard generated virtual function overrides [J C:  
  //{{AFX_VIRTUAL(CCaptureDlg) /c$\X<b);  
 public: r&2~~_d3y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); D!oc>K$B  
 protected: %&Fk4Z}M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +*n-<x5"  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e.*%K!(  
  //}}AFX_VIRTUAL cDoo*  
  // Implementation $%%os6y2v  
 protected: +e-,ST&w(  
  HICON m_hIcon; e|rg;`AW  
  // Generated message map functions WH$e2[+Y  
  //{{AFX_MSG(CCaptureDlg) F*Z=<]<+  
  virtual BOOL OnInitDialog(); $XU5??8  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); QeDQ o  
  afx_msg void OnPaint(); (Si=m;g  
  afx_msg HCURSOR OnQueryDragIcon(); -3&G"hfK  
  virtual void OnCancel(); M^7MU}5w  
  afx_msg void OnAbout(); o%4Gd~  
  afx_msg void OnBrowse(); 5I,gBT|B  
  afx_msg void OnChange(); z*a8sr  
 //}}AFX_MSG ?|1Mv1C?  
 DECLARE_MESSAGE_MAP() :qvI%1cP=  
}; kwud?2E  
#endif 7P B)'Wl"6  
3s:%2%jVK  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +'G0{;b  
#include "stdafx.h" m$LVCB  
#include "Capture.h" ZO7&vF}  
#include "CaptureDlg.h" ur\qOX|{  
#include <windowsx.h> ,=~z6[  
#pragma comment(lib,"hook.lib") {&[9iIf  
#ifdef _DEBUG 8*SP~q  
#define new DEBUG_NEW 3^ StIw{X  
#undef THIS_FILE $3d}"D  
static char THIS_FILE[] = __FILE__; PU {uE[  
#endif ;&b%Se@#p  
#define IDM_SHELL WM_USER+1 &5%dhc4&!&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %y<ejM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g2R@`./S  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; CN2_bz  
class CAboutDlg : public CDialog P0i V<T4^  
{ phYDs9-K  
 public: /U$8TT8+-  
  CAboutDlg(); fIocq  
  // Dialog Data G2#d $  
  //{{AFX_DATA(CAboutDlg) Y=*P 8pg  
  enum { IDD = IDD_ABOUTBOX }; QR> Y%4 ;h  
  //}}AFX_DATA D%7kBfCb  
  // ClassWizard generated virtual function overrides RkuuogZ  
  //{{AFX_VIRTUAL(CAboutDlg) 9]>iSG^H  
 protected: D\~e&0*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `aqrSH5^h  
  //}}AFX_VIRTUAL +<.\5+  
  // Implementation  ?W0(|9  
 protected: )ZejQ}$  
  //{{AFX_MSG(CAboutDlg) ; U`X 6d  
  //}}AFX_MSG >~\w+^2f8  
  DECLARE_MESSAGE_MAP() xAwf49N~  
}; [`Cq\mI-W  
up%Z$"Y  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) l+y}4 k=/  
{ }E}8_ 8T6  
 //{{AFX_DATA_INIT(CAboutDlg) Y& ] 8 {  
 //}}AFX_DATA_INIT ?G08NR  
} {^Pq\h;  
x3e]d$  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) =/+#PVO  
{ X['2b78k  
 CDialog::DoDataExchange(pDX); nN3$\gHp8i  
 //{{AFX_DATA_MAP(CAboutDlg) [ut#:1h^  
 //}}AFX_DATA_MAP Ra3ukYG[  
} !7U\J]  
JeY' 8B  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^*^/]vM  
 //{{AFX_MSG_MAP(CAboutDlg) uO >x:*^8  
 // No message handlers bO<0qM~  
 //}}AFX_MSG_MAP S^cH}-+  
END_MESSAGE_MAP() }wSy  
Hh kN^S,  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D6Y6^eS-  
: CDialog(CCaptureDlg::IDD, pParent) {BO|u{C  
{ 137Xl>nO  
 //{{AFX_DATA_INIT(CCaptureDlg) (\dK4JJ  
  m_bControl = FALSE; 2D([Z-<i  
  m_bAlt = FALSE; BN@,/m9OQ%  
  m_bShift = FALSE; mEQ!-p   
  m_Path = _T("c:\\"); {$^SP7qV#>  
  m_Number = _T("0 picture captured."); !Zbesp KZ  
  nCount=0; >sj bK%  
  bRegistered=FALSE; U&y`-@A4  
  bTray=FALSE; "L3Xd][  
 //}}AFX_DATA_INIT TRKgBK$,  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %HSl)zEo>C  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); u{bL-a8}  
} L"rcv:QWZa  
[}3cDR  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) V+w u  
{ S;A)C`X&  
 CDialog::DoDataExchange(pDX); mjEs5XCC"  
 //{{AFX_DATA_MAP(CCaptureDlg) w}M3x^9@  
  DDX_Control(pDX, IDC_KEY, m_Key); zfjTQMaxh  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); (:Cc3  
  DDX_Check(pDX, IDC_ALT, m_bAlt); %^9:%ytt  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); <]8^J}8T{D  
  DDX_Text(pDX, IDC_PATH, m_Path); B; -2$ 77  
  DDX_Text(pDX, IDC_NUMBER, m_Number); c6b0*!D"}  
 //}}AFX_DATA_MAP ZM~`Gd9K0E  
} el'j&I  
98*x 'Wp  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) H_X?dj15  
//{{AFX_MSG_MAP(CCaptureDlg) #@Ujx_F  
 ON_WM_SYSCOMMAND() B#tdLv"I  
 ON_WM_PAINT() =s'7$D}0.  
 ON_WM_QUERYDRAGICON() Sue 6+p  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) {TL +7kiX/  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Z~3u:[x";  
 ON_BN_CLICKED(ID_CHANGE, OnChange) (L|}`  
//}}AFX_MSG_MAP B4O6> '  
END_MESSAGE_MAP() "E>t, D  
p,n\__  
BOOL CCaptureDlg::OnInitDialog() |5 xzl  
{ =w <VT%  
 CDialog::OnInitDialog(); fW~*6ln  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7<yp"5><)  
 ASSERT(IDM_ABOUTBOX < 0xF000); { (\(m/!Z  
 CMenu* pSysMenu = GetSystemMenu(FALSE); PZ34*q  
 if (pSysMenu != NULL) 7Qh_8M  
 { K&UE0JO'  
  CString strAboutMenu; B <+K<,S  
  strAboutMenu.LoadString(IDS_ABOUTBOX); k!doIMj  
  if (!strAboutMenu.IsEmpty()) j??tmo  
  { cw+g z!!  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9bn2UiJ k  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;,0lUcV  
  } \n@V-b  
 } !"! i i$@  
 SetIcon(m_hIcon, TRUE); // Set big icon /S/aUvN  
 SetIcon(m_hIcon, FALSE); // Set small icon l(Cf7o!  
 m_Key.SetCurSel(0); 797X71>  
 RegisterHotkey(); 5.k}{{+  
 CMenu* pMenu=GetSystemMenu(FALSE); >38 Lt\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  C6)R#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); a9[<^  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5OB]x?4]  
 return TRUE; // return TRUE unless you set the focus to a control RqGVp?   
} '\L0xw4  
Wg(bD,  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) pruWO'b`  
{ {NeWdC  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) l.7d$8'\  
 { @*_ZoO7{  
  CAboutDlg dlgAbout; & zgPN8u  
  dlgAbout.DoModal(); q2!'==h2i  
 } dwp: iM  
 else )nnCCR S6  
 { L*O>IQh2  
  CDialog::OnSysCommand(nID, lParam); XTj73 MWY  
 } !~d'{sy6  
} Yzd2G,kZ=  
Y*\6o7  
void CCaptureDlg::OnPaint() a*Jn#Mx<M  
{ Uk02IOXQ  
 if (IsIconic()) ?48AY6  
 { ! IgoL&=  
  CPaintDC dc(this); // device context for painting K_##-6>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); BVAr&cu  
  // Center icon in client rectangle RH=$h! 5  
  int cxIcon = GetSystemMetrics(SM_CXICON); O3+)qb!X  
  int cyIcon = GetSystemMetrics(SM_CYICON); Bj&_IDs4  
  CRect rect; ru(J5+H  
  GetClientRect(&rect); SKJW%(|3  
  int x = (rect.Width() - cxIcon + 1) / 2; ~BQV]BJ7  
  int y = (rect.Height() - cyIcon + 1) / 2; Bhx<g&|j  
  // Draw the icon _vIO !*h0  
  dc.DrawIcon(x, y, m_hIcon); fkBLrw  
 } {~nvs4X  
 else kdBV1E+:C  
 { /u ?9S/  
  CDialog::OnPaint(); j=Q$K #sBt  
 } od(:Y(4  
} aG Ef#A  
3d@ef |  
HCURSOR CCaptureDlg::OnQueryDragIcon() hA5,w_G/  
{ w^ U}|h"  
 return (HCURSOR) m_hIcon; !^1[ s@1  
} d|3o/@k  
+l.|kkZ?  
void CCaptureDlg::OnCancel() ` #=fA  
{ v D&Kae<  
 if(bTray) Ym:{Mm=ud  
  DeleteIcon(); x?rbgsB5&  
  CDialog::OnCancel(); vQy$[D*  
} \KN dZC?V2  
4$F:NW,v:)  
void CCaptureDlg::OnAbout() +:!ScG*  
{ (tpof 5a  
 CAboutDlg dlg; S{ey@ X(  
 dlg.DoModal(); `>\4"`I  
} v#-E~;C cC  
@?Fx  
void CCaptureDlg::OnBrowse() ^ePsIl1E  
{ Fj,(_^  
 CString str; /_HwifRQ  
 BROWSEINFO bi; d>;2,srUf  
 char name[MAX_PATH]; 1GUqT 9)  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); L!&$c&=xf  
 bi.hwndOwner=GetSafeHwnd(); 2@4x"F]U;  
 bi.pszDisplayName=name; m]1!-`(*  
 bi.lpszTitle="Select folder"; +!Q!m 3/I  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; E;xMPK$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); TMNfJz   
 if(idl==NULL) bSY;[{Kl  
  return;  *[VEF  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;hkro$  
 str.ReleaseBuffer(); zdqnL^wb  
 m_Path=str; {f&NStiB  
 if(str.GetAt(str.GetLength()-1)!='\\') 0Ux<16#  
  m_Path+="\\"; 4uX,uEa  
 UpdateData(FALSE); u\:rY)V  
} @c0n2 Xcr  
(lieiye^  
void CCaptureDlg::SaveBmp() mZ~mf->%  
{ 2|$lk8/,  
 CDC dc; ,zG<7~m  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8znj~7}#  
 CBitmap bm; z2.*#xTZn  
 int Width=GetSystemMetrics(SM_CXSCREEN); `(!W s\:  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~c!Rx'  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ot]>}[  
 CDC tdc; x3gwG)Sf  
 tdc.CreateCompatibleDC(&dc); \ibCR~W4  
 CBitmap*pOld=tdc.SelectObject(&bm); Q6eN+i2 ;  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); y{YXf! AS  
 tdc.SelectObject(pOld); }Z"28?  
 BITMAP btm; kSB3KR;~n  
 bm.GetBitmap(&btm); "$]ls9-%n  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -J{Dxz  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); {3.*7gnY\L  
 BITMAPINFOHEADER bih; |OOXh[y  
 bih.biBitCount=btm.bmBitsPixel; Td5bDO  
 bih.biClrImportant=0; ss/h[4h4h  
 bih.biClrUsed=0; DgC3 > yL  
 bih.biCompression=0; 3Ca \`m)l  
 bih.biHeight=btm.bmHeight; +g)_4fV0|  
 bih.biPlanes=1; AS`2=w  
 bih.biSize=sizeof(BITMAPINFOHEADER); %A8Pkr<&E  
 bih.biSizeImage=size; W)|c[Q\  
 bih.biWidth=btm.bmWidth; /tG5!l  
 bih.biXPelsPerMeter=0; B%TXw#|  
 bih.biYPelsPerMeter=0; P8"6"}B;T  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); qbEKp HnB  
 static int filecount=0; /3OC7!~;fM  
 CString name; U?JiVxE^  
 name.Format("pict%04d.bmp",filecount++); s Ke,  
 name=m_Path+name; ? 7/W>  
 BITMAPFILEHEADER bfh;  \C!%IR  
 bfh.bfReserved1=bfh.bfReserved2=0; G(:s-x ig6  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -l\~p4U  
 bfh.bfSize=54+size; KbXbT  
 bfh.bfOffBits=54; dFd lB `L  
 CFile bf; $*YC7f  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ u)tHOV>&  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); N[0 xqQ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); a3Z :C!|O'  
  bf.WriteHuge(lpData,size); mYiSR   
  bf.Close(); UaH26fWs  
  nCount++; _{lx*dq  
 } ;,<r|.6U  
 GlobalFreePtr(lpData); ".Lhte R?  
 if(nCount==1) C(EYM$  
  m_Number.Format("%d picture captured.",nCount); @YEw^J~  
 else kuWK/6l4  
  m_Number.Format("%d pictures captured.",nCount); IRlN++I!  
  UpdateData(FALSE); 6e-#XCR{  
} FYp|oD2=1  
{9h`$e=  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) JX2mTQ  
{ Fl B, (Cm  
 if(pMsg -> message == WM_KEYDOWN) ;3 G~["DA  
 { h9w@oRp`~  
  if(pMsg -> wParam == VK_ESCAPE) <P|`7wfxE  
   return TRUE; Ko1AaX(I'+  
  if(pMsg -> wParam == VK_RETURN) ->#y(}  
   return TRUE; )`B -O::  
 } <P+G7!KZ&  
 return CDialog::PreTranslateMessage(pMsg); 0\? _ lT2  
} Aqa6R+c  
'q{PtYr  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >(IITt  
{ }%-UL{3%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){  ]# Y|   
  SaveBmp(); 0 $n8b/%.  
  return FALSE; ^^n +  
} =#OHxM  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ jz{(q;  
 CMenu pop; JN{<oxI  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :hC {5!|  
 CMenu*pMenu=pop.GetSubMenu(0); v9Z lNA7m!  
 pMenu->SetDefaultItem(ID_EXITICON); 1 ;_{US5FR  
 CPoint pt; `V]egdO  
 GetCursorPos(&pt); u&1j>`~qJ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =nJOaXR0  
 if(id==ID_EXITICON) g2+l@$W  
  DeleteIcon(); XD;15a  
 else if(id==ID_EXIT) :*mA,2s  
  OnCancel(); e*Uz# w:  
 return FALSE; _ff=B  
} DCEvr"(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]NaMZ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) y3&Tv  
 AddIcon(); c'4>D,?1  
 return res; @?<N +qdH>  
} &/B2)l6a  
yf `.%  
void CCaptureDlg::AddIcon() 3S[w'  
{ Fv?R\`52u  
 NOTIFYICONDATA data; 8vz_~p9%j  
 data.cbSize=sizeof(NOTIFYICONDATA); r!{w93rPX  
 CString tip; SRA|7g}7W  
 tip.LoadString(IDS_ICONTIP); !Z#_X@NFc  
 data.hIcon=GetIcon(0); D__lqboz  
 data.hWnd=GetSafeHwnd(); anHBy SI3  
 strcpy(data.szTip,tip); hKk\Y{wv'  
 data.uCallbackMessage=IDM_SHELL; *23m-  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1VhoJGH;C  
 data.uID=98; IUh5r(d 68  
 Shell_NotifyIcon(NIM_ADD,&data); 5en [)3E  
 ShowWindow(SW_HIDE); L eG7x7n  
 bTray=TRUE; r[.zLXgK  
} N oX_?  
o7_MMeQ4  
void CCaptureDlg::DeleteIcon() J{nyo1A  
{ '+ o:,6  
 NOTIFYICONDATA data; Fpj6Atk  
 data.cbSize=sizeof(NOTIFYICONDATA); pRQ fx^ On  
 data.hWnd=GetSafeHwnd(); K^!e-Xi6  
 data.uID=98; ,^MW)Gf<  
 Shell_NotifyIcon(NIM_DELETE,&data); 7,V!Iv^X  
 ShowWindow(SW_SHOW); tz\+'6NpOb  
 SetForegroundWindow(); >>oASo  
 ShowWindow(SW_SHOWNORMAL); dD/29b(  
 bTray=FALSE; s,UN'~e1  
} l|@/?GaH  
GibggOj2Q,  
void CCaptureDlg::OnChange() ^}i5 0SG:y  
{ ~pd1 )  
 RegisterHotkey(); %\(y8QV  
} '8r8 ^g[  
xJ[k#?T'  
BOOL CCaptureDlg::RegisterHotkey() s${T*)S@G  
{ 'k-u9  
 UpdateData(); <|KKv5[  
 UCHAR mask=0; L|]w3}ZT@  
 UCHAR key=0; nLFx/5sL  
 if(m_bControl) A@@)lD.  
  mask|=4; <F#*:Re_y  
 if(m_bAlt) yNhscAMNn  
  mask|=2; 2fj0 I  
 if(m_bShift) /%ODJ1M  
  mask|=1; , 6EZb[;g^  
  key=Key_Table[m_Key.GetCurSel()]; f_re"d 3u  
 if(bRegistered){ 5{R#h :  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); d I#8CO  
  bRegistered=FALSE; D&z'tf5  
 } jm#d7@~4  
 cMask=mask; _SBp66 r  
 cKey=key; H0D>A<Ue  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #.\,y>`  
 return bRegistered; [p( #WM:  
} AhbT/  
ADLa.{  
  四、小结  qrkRD*a  
9I`Mm}v@  
  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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