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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: kPO6gdwq$  
  _3.G\/>[K  
  一、实现方法 8jjFC9Cbn0  
|0L=8~M(j  
  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: e?!L}^f6X  
w#xeua|*I#  
#pragma data_seg("shareddata") rv}mD  
HHOOK hHook =NULL; //钩子句柄 -SvTg{Q{la  
UINT nHookCount =0; //挂接的程序数目 RVkU+7  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ^`rpf\GX(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 d@4rD}_Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \TbsoWX  
static int KeyCount =0; +5HnZ?E\  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 V#NG+U.B  
#pragma data_seg() ~!ZmF(:  
T A\4uy6o  
  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。 ou'~{-_xd  
^qeY9O  
  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: (T|TEt  
i*S|qX7``  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR c~^CKgr~R9  
cKey,UCHAR cMask) H|;*_  
{ 4mN].X[,  
 BOOL bAdded=FALSE; !/j,hO4Z4  
 for(int index=0;index<MAX_KEY;index++){ w; 4jx(  
  if(hCallWnd[index]==0){ iiX\it$s  
   hCallWnd[index]=hWnd; :reP} Da7q  
   HotKey[index]=cKey; Xnv@H:$mxk  
   HotKeyMask[index]=cMask; (#6AKr9K  
   bAdded=TRUE; +Qh[sGDdY  
   KeyCount++; ](W5.a,-$L  
   break; D XV@DQ  
  } 7}4'dW.  
 } <nWKR,  
 return bAdded; , 3X: )  
} TN35CaSmq  
//删除热键 ZfPd0 p  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jt{9e:2%  
{ >Mvka;T]  
 BOOL bRemoved=FALSE; ~x|aoozL  
 for(int index=0;index<MAX_KEY;index++){ ~:>AR` 9G  
  if(hCallWnd[index]==hWnd){ L[?nST18%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Kt W6AZJ  
    hCallWnd[index]=NULL; "z^(dF|  
    HotKey[index]=0; q,B3ru.?d  
    HotKeyMask[index]=0; e~{^oM  
    bRemoved=TRUE; FR x6c  
    KeyCount--; _eJXi,  
    break; w6T[hZ 9  
   } '>j<yaD'  
  } v6s\Z\v)Q`  
 } n /QfdAg  
 return bRemoved; q!6|lZB3  
} Hm%g_Mt  
DY9fF4[9a  
|3}5:k  
  DLL中的钩子函数如下: 2fl4h<V  
&E bI Op  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;%' b;+  
{ AZwl fdLB  
 BOOL bProcessed=FALSE; TQP+>nS,  
 if(HC_ACTION==nCode) w *50ZS;N  
 { QR<`pmB~y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 43zUN  
   switch(wParam) *q0`})IQ  
   {  o`bo#A  
    case VK_MENU: z[fB!O  
     MaskBits&=~ALTBIT; lT.zNhz:d9  
     break; \6sqyWI %  
    case VK_CONTROL: zZ%DtxUoU.  
     MaskBits&=~CTRLBIT; A\K,_&x1Z  
     break; )^4hQ3BS  
    case VK_SHIFT: ^q ;Cx7T_p  
     MaskBits&=~SHIFTBIT; KOjluP  
     break; gQ37>  
    default: //judge the key and send message ![ZmV  
     break; 57~Uqt  
   } nV}8M  
   for(int index=0;index<MAX_KEY;index++){ _%Bz,C8  
    if(hCallWnd[index]==NULL) No) m/17y  
     continue; CSL#s^4T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gv#4#]  
    { Ia2(Km  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); mN;+TN'?{  
     bProcessed=TRUE; ?GdsOg^  
    } eNRs&^  
   } !X|k"km"  
  } $X*mdji  
  else if((lParam&0xc000ffff)==1){ //有键按下 hd B |#t  
   switch(wParam) #,L~w  
   { 8tLHr@%%  
    case VK_MENU: XS?gn.o\  
     MaskBits|=ALTBIT; "PMQyzl  
     break; o0ZIsrr  
    case VK_CONTROL: ?aBj#  
     MaskBits|=CTRLBIT; ak;6z]f8[  
     break; n@!wp/J,  
    case VK_SHIFT: +\0T\;-Xe  
     MaskBits|=SHIFTBIT; OL'P]=U  
     break; n`(~O O  
    default: //judge the key and send message -4w%Iy  
     break; |uI?ySF  
   } =m7H)z)i*J  
   for(int index=0;index<MAX_KEY;index++){ igDG}q3jG  
    if(hCallWnd[index]==NULL) `>6T&  
     continue; MRfb[p3Cx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -DP*q3  
    { !9;)N,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,_jC$  
     bProcessed=TRUE; @x1 %)1  
    } @o>EBZ7MS  
   } 22 &'@C>  
  } )%mg(O8uL  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 g5+7p@'fV  
   for(int index=0;index<MAX_KEY;index++){ S]^`woD  
    if(hCallWnd[index]==NULL) dAc ?O-~  
     continue; w{!(r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pr tK:eGe2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); x)SralWb  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 m:uPEpcU  
   } +dk f cG  
  } [:h5}  
 } ;HNq>/{  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  c 6"Ib)  
} ;au*V5a%  
%'bJ:  
  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: VfSj E.|  
e_.Gw"/Yl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6)qp*P$L  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rh!;|xB|+  
#(KDjnP[  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: HeLG?6  
tIc 7:th  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) PT'MNH  
{ m^V5*JIh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) _V2xA88  
 { |A\a4f 'G  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 j.m(ltGh  
  SaveBmp(); #Exp51  
  return FALSE; +D&Pp0xe  
 } [Wi 1|]X"G  
 …… //其它处理及默认处理 ?Q0I'RC  
} KkcXNjPVS  
h|D0z_f  
zF`3 gl.  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 rf.`h{!!  
8)L*AdDAW!  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 WBr59@V  
5'KA'>@  
  二、编程步骤 aUc|V{Jp  
pTJX""C  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; MHU74//fe  
E5</h"1  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; M5g\s;y;  
SJ?cI!=x  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; MSw$_d  
>yB(lKV  
  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; >6<q8{*  
#wY0D_3@1  
  5、 添加代码,编译运行程序。 dOFD5}_   
.ubE2X[][  
三、程序代码 @n -r-Q  
)5_jmW`n  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL i#/]KsSp  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "%qzj93>  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ mh.+."<)F  
#if _MSC_VER > 1000 &@% $2O.3  
#pragma once Qm4o7x{q  
#endif // _MSC_VER > 1000 A1 "SLFY  
#ifndef __AFXWIN_H__ x79Ha,  
#error include 'stdafx.h' before including this file for PCH CyDV r  
#endif cxIk<&i~(  
#include "resource.h" // main symbols a5Y IUVCv  
class CHookApp : public CWinApp 424(3-/v;  
{ /,@p\Ae5  
 public: piy`zc- yu  
  CHookApp(); q%Yn;g|_  
  // Overrides up>c$jJ  
  // ClassWizard generated virtual function overrides  asHxL!  
  //{{AFX_VIRTUAL(CHookApp) 30>3 !Xqa  
 public: *`_{  
  virtual BOOL InitInstance(); r [:   
  virtual int ExitInstance(); n/~A`%E@  
  //}}AFX_VIRTUAL zCv"]%  
  //{{AFX_MSG(CHookApp) #bH_Dg5I  
  // NOTE - the ClassWizard will add and remove member functions here. c(#;_Ve2P  
  // DO NOT EDIT what you see in these blocks of generated code ! MUnEuhXTr  
  //}}AFX_MSG 4_A0rveP  
  DECLARE_MESSAGE_MAP() A@hppaP!  
}; U8.7>ENnP&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); _>+8og/%@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]hos+;4p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +{<#(}  
BOOL InitHotkey(); ^D%FX!$  
BOOL UnInit(); U*3J+Y  
#endif YNwp/Y  
km~Ll   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. br-]fE.be  
#include "stdafx.h" AN!s{7V3  
#include "hook.h" Ae]sGU|?'  
#include <windowsx.h> oVFnl A  
#ifdef _DEBUG ;oZ)Wt  
#define new DEBUG_NEW R;,g1m|]  
#undef THIS_FILE >/[GTqi  
static char THIS_FILE[] = __FILE__; ApBWuXp|u  
#endif AIMSX]m  
#define MAX_KEY 100 R^?/' dr  
#define CTRLBIT 0x04 H0m|1 7  
#define ALTBIT 0x02 tW WWx~k  
#define SHIFTBIT 0x01 KlRr8 G!Z  
#pragma data_seg("shareddata") 7f rTTSZ  
HHOOK hHook =NULL; %\]* OZ7  
UINT nHookCount =0; L:XC  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey X+UJzR90  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT *na?n2Yzt  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey c\a_VRN>r  
static int KeyCount =0; '5&s=M_  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8NyJc"T<.  
#pragma data_seg() [ ol9|sdu  
HINSTANCE hins; kuyjnSo9i  
void VerifyWindow(); hxQqa 0B  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) y@0E[/O  
//{{AFX_MSG_MAP(CHookApp) BauU{:Sh  
// NOTE - the ClassWizard will add and remove mapping macros here. !*R qCS,  
// DO NOT EDIT what you see in these blocks of generated code! DL$@?.?I  
//}}AFX_MSG_MAP :#@= B]  
END_MESSAGE_MAP() FEVEp  
PDs@?nz,  
CHookApp::CHookApp() ~e6Brq  
{ 1UPC e  
 // TODO: add construction code here, 4R18A=X  
 // Place all significant initialization in InitInstance Ym3\pRFiD  
} 'Ut7{rZ5  
hjZKUM G(k  
CHookApp theApp; 6DH~dL_",%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "g$IP9?U  
{ /p8dZ+X  
 BOOL bProcessed=FALSE; DI+fwXeg  
 if(HC_ACTION==nCode) qkiI/nH3  
 { ep)>X@t  
  if((lParam&0xc0000000)==0xc0000000){// Key up bv&;R  
   switch(wParam) n2iJ%_zp  
   { ty8v 6J#  
    case VK_MENU: .l.a(_R  
     MaskBits&=~ALTBIT; X5 j1`t,  
     break; ~l)-wNqR4r  
    case VK_CONTROL: J0@X<Lt U  
     MaskBits&=~CTRLBIT; Q~Hy%M%R3  
     break; M5 <@~V/[  
    case VK_SHIFT: @Y1s$,=xB  
     MaskBits&=~SHIFTBIT; c%MW\qx  
     break; l1f\=G?tmU  
    default: //judge the key and send message %i5M77#Z  
     break; \otWd  
   }  4^M  
   for(int index=0;index<MAX_KEY;index++){ gLOEh6  
    if(hCallWnd[index]==NULL) AvfNwE  
     continue; y&V@^ "`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9I4K}R  
    { rx]  @A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ax(c#  
     bProcessed=TRUE; ? #fu.YE\  
    } J:Qa5MTWp  
   } Z'\h  
  } k |eBJ%  
  else if((lParam&0xc000ffff)==1){ //Key down 2AMo:Jqv  
   switch(wParam) u:=7l  
   { g*_cP U0~m  
    case VK_MENU: VIv&ofyAR  
     MaskBits|=ALTBIT; <ZNzVnVA  
     break; 9b9$GyI  
    case VK_CONTROL: ME*LH r,  
     MaskBits|=CTRLBIT; zzX_q(:S  
     break; b45-:mi!&#  
    case VK_SHIFT: ~{jcH  
     MaskBits|=SHIFTBIT; "hsb8-  
     break; L U={")TdQ  
    default: //judge the key and send message ]"?)Z  
     break; sVOyT*GY  
   } PK`D8)=u  
   for(int index=0;index<MAX_KEY;index++) t+!$[K0/  
   { JsODzw  
    if(hCallWnd[index]==NULL) ^zQ/mo,Z  
     continue; `Tv[DIVW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a6uJYhS~  
    { |>dI/_'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); fTK3,s1=  
     bProcessed=TRUE; ?`PvL!'  
    } lE4HM$p   
   } $w`=z<2yo1  
  } =`H@%  
  if(!bProcessed){ NU5.o$  
   for(int index=0;index<MAX_KEY;index++){ OG>}M$ Ora  
    if(hCallWnd[index]==NULL) % ~H=sjg  
     continue; u)+8S/ )  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E? ; 0)'h  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T7hcnF$  
   } |R/%D%_g  
  } A;]}m8(*  
 } vVFy*#I#_[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +l<5#pazx  
} V<T9&8l+:  
<h:x=  
BOOL InitHotkey() 6\q]rfQ  
{ rE.;g^4p  
 if(hHook!=NULL){ ]QlwR'&j/n  
  nHookCount++; huh6t !  
  return TRUE; b?tB(if!I  
 } P*3BB>FO   
 else `xqr{lhL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |}Nn!Sj>#;  
  if(hHook!=NULL) #."-#"0  
   nHookCount++; CTq&-l:f  
  return (hHook!=NULL); :&V h?  
} ?kbiMs1;u  
BOOL UnInit() #_^Lb]jkM  
{ e#$]Y?,  
 if(nHookCount>1){ j i7[nY  
  nHookCount--; #Y a4ps_  
  return TRUE; ix)M`F%P3  
 } RC7]'4o  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 4NheWM6  
 if(unhooked==TRUE){ UCB/=k^m  
  nHookCount=0; 5YeM%%-S  
  hHook=NULL; I 8`VNA&b  
 }  3KlbP  
 return unhooked; gd`!tRcNY  
} i:Y^{\Z?V  
+M\`#i\g>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) q_A!'sm@)  
{ 3TeY%5iVt  
 BOOL bAdded=FALSE; vqDu(6!2  
 for(int index=0;index<MAX_KEY;index++){ (MxQ+D\  
  if(hCallWnd[index]==0){ MOQ*]fV:  
   hCallWnd[index]=hWnd; d928~y W  
   HotKey[index]=cKey; | *2w5iR  
   HotKeyMask[index]=cMask; }v}P .P  
   bAdded=TRUE; >UiYL}'br6  
   KeyCount++; ^ *k?pJ5  
   break; jFL #s&ft  
  } P}n_IV*@  
 } ,Z&xNBX  
 return bAdded; '"0'Oua  
} 1 ySk;;3  
'YmIKIw  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w0rRSD4S8B  
{ f e\$@-  
 BOOL bRemoved=FALSE; G\2 CR*  
 for(int index=0;index<MAX_KEY;index++){ /Kql>$I  
  if(hCallWnd[index]==hWnd){ gY/"cq  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {Aw#?#GPW  
    hCallWnd[index]=NULL; iT3BF"ZqBO  
    HotKey[index]=0; /R]U}o^/(%  
    HotKeyMask[index]=0; C~,a!qY  
    bRemoved=TRUE; ! >(7+B3E*  
    KeyCount--; GfoLae  
    break; [8 ]z|bM  
   } {FeDvhv  
  } t5\-v_mG=&  
 } Cjm`|~&e+  
 return bRemoved; IA8f*]?  
} &Cr:6W@A  
_n0CfH.v  
void VerifyWindow() }~e8e   
{ ,<(}|go   
 for(int i=0;i<MAX_KEY;i++){ :}'=`wa  
  if(hCallWnd!=NULL){ #A1%gIw<v2  
   if(!IsWindow(hCallWnd)){ 9-&Ttbb4)0  
    hCallWnd=NULL; ]b2pG'  
    HotKey=0; ^a0um/+M}  
    HotKeyMask=0; EN<F# Y3E  
    KeyCount--; JVvs-bK5  
   } Ns>- o  
  } +~m46eI  
 } N)uSG&S:  
} 6Zm# bFQ  
q;T{|5/O  
BOOL CHookApp::InitInstance() x9UX!Z5*>  
{ L iN$ pwm  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); e'6/` Evqz  
 hins=AfxGetInstanceHandle(); aH)}/n  
 InitHotkey(); JU1~e@/'%  
 return CWinApp::InitInstance(); Z]>O+  
} |mxDjgq  
o[Q MTP  
int CHookApp::ExitInstance() XKj|f`  
{ ]#)()6)2v  
 VerifyWindow(); BTqS'NuT  
 UnInit(); ! `   
 return CWinApp::ExitInstance(); ] {RDVA=]  
} ;w{tv($$  
!"?#6-,Xn  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file dyz2.ZY~2  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6 a(yp3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ kyR:[+je  
#if _MSC_VER > 1000 g0xuxK;9c  
#pragma once pnl{&<$C%C  
#endif // _MSC_VER > 1000 /?uPEKr  
EU2$f  
class CCaptureDlg : public CDialog ,k +IPkN+  
{ CM/H9Kz.  
 // Construction Qf~vZtJ+J  
 public: zqimR#u  
  BOOL bTray; sJB;3"~  
  BOOL bRegistered; 1{)5<!9!l  
  BOOL RegisterHotkey();  ~^NtO  
  UCHAR cKey; zGb|)A~,  
  UCHAR cMask; 8bTn^!1  
  void DeleteIcon(); ePOG}k($/%  
  void AddIcon(); >{q]&}^U  
  UINT nCount; Nyku4r0  
  void SaveBmp(); {% rA1g  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ((YMVe  
  // Dialog Data H4WP~(__  
  //{{AFX_DATA(CCaptureDlg) Q:2>}QgX}  
  enum { IDD = IDD_CAPTURE_DIALOG }; /C:Y94B-z  
  CComboBox m_Key; u 1>2v  
  BOOL m_bControl; wT6"U$cV  
  BOOL m_bAlt; ? ^0:3$La  
  BOOL m_bShift; Z)I+@2  
  CString m_Path; 29;?I3< *  
  CString m_Number; [>jbhV'  
  //}}AFX_DATA pR*VdC _mY  
  // ClassWizard generated virtual function overrides K^ vIUZ>  
  //{{AFX_VIRTUAL(CCaptureDlg) Y+kfBvxyf  
 public: -$pzl,^ h  
  virtual BOOL PreTranslateMessage(MSG* pMsg); aB_F9;IR  
 protected: EuZ<quwWg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iw3FA4{(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >nJ\BPx  
  //}}AFX_VIRTUAL F~,Mw8  
  // Implementation &Qf/>@ l}  
 protected: 8r*E-akuyr  
  HICON m_hIcon; cXA i k-  
  // Generated message map functions Eq%}  
  //{{AFX_MSG(CCaptureDlg) \{Y 7FC~  
  virtual BOOL OnInitDialog(); ;"a=gr  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); EEEh~6?-e  
  afx_msg void OnPaint(); =2`[&  
  afx_msg HCURSOR OnQueryDragIcon(); vNyf64)  
  virtual void OnCancel(); D>`xzt'.6  
  afx_msg void OnAbout(); /j #n  
  afx_msg void OnBrowse(); $.Qkb@}  
  afx_msg void OnChange(); ]&o$b]  
 //}}AFX_MSG ;;!yC  
 DECLARE_MESSAGE_MAP() NxkGOAOE  
}; ..IfP@  
#endif V pE*(i$  
P}Gj %4/G  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file M,j U}yD3  
#include "stdafx.h" aZH:#lUlj  
#include "Capture.h" bZ dNibN  
#include "CaptureDlg.h" tZ]?^_Y1  
#include <windowsx.h> / kF)  
#pragma comment(lib,"hook.lib") 8V~k5#&Ow  
#ifdef _DEBUG P@,XEQRd`  
#define new DEBUG_NEW 4-l 8,@9  
#undef THIS_FILE .N,bIQnj  
static char THIS_FILE[] = __FILE__; 57'*w]4f  
#endif BGvre'67  
#define IDM_SHELL WM_USER+1  `xKp%9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T.])diuvj-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6Pz4\uE=  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; `fA@hK   
class CAboutDlg : public CDialog ^7 w+l @  
{ `{f}3bO7C  
 public: 3(="YbZ  
  CAboutDlg(); qz"}g/;?  
  // Dialog Data X1DF*wI  
  //{{AFX_DATA(CAboutDlg) {JO^ tI  
  enum { IDD = IDD_ABOUTBOX }; q;B4WL}  
  //}}AFX_DATA S-a]j;U  
  // ClassWizard generated virtual function overrides `68@+|#  
  //{{AFX_VIRTUAL(CAboutDlg) .u)X3..J  
 protected: 2bv=N4ly  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x!?u^  
  //}}AFX_VIRTUAL f&=AA@jLv  
  // Implementation XPavReGf  
 protected: h&M{]E9=  
  //{{AFX_MSG(CAboutDlg) \S"isz  
  //}}AFX_MSG .r|tSfm6  
  DECLARE_MESSAGE_MAP() &pP;Neh;  
}; 034iK[ib"  
|T<_5Ik  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) c/:b.>W  
{ ~Zun&b)S  
 //{{AFX_DATA_INIT(CAboutDlg) 5-FQMXgThc  
 //}}AFX_DATA_INIT ;nI] !g:  
} F3y9@dA]  
S50k>_a;  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) s,"]aew  
{ ?so=;gh  
 CDialog::DoDataExchange(pDX); mu\6z_e  
 //{{AFX_DATA_MAP(CAboutDlg) ]V[q(-Jk  
 //}}AFX_DATA_MAP o$wEEz*4  
} 7z%L*z8V  
=%BSKSG.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) a]$1D!Anc  
 //{{AFX_MSG_MAP(CAboutDlg) jrCfWa}z  
 // No message handlers Ja|5 @  
 //}}AFX_MSG_MAP ;"xfOzQ  
END_MESSAGE_MAP() ]l;o}+`G  
m~w[~flgZ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) A9[ F  
: CDialog(CCaptureDlg::IDD, pParent) R#s )r  
{ E7WK (  
 //{{AFX_DATA_INIT(CCaptureDlg) n"h `5p5'  
  m_bControl = FALSE; ]>W6 bTK  
  m_bAlt = FALSE; C+* d8_L  
  m_bShift = FALSE; B~?*?Z'  
  m_Path = _T("c:\\"); kS%Ydy#:'  
  m_Number = _T("0 picture captured."); 6{@w="VT  
  nCount=0; 5u,{6  
  bRegistered=FALSE; 1;JEc9# h  
  bTray=FALSE; l94b^W}1)W  
 //}}AFX_DATA_INIT 1ufp qqk  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 J9..P&c\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ISzqEi  
} :W"~ {~#?  
?3/qz(bM  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Je';9(ZK  
{ gl~ecc  
 CDialog::DoDataExchange(pDX);  Z< 1  
 //{{AFX_DATA_MAP(CCaptureDlg) rbul8(1h  
  DDX_Control(pDX, IDC_KEY, m_Key); Z@yW bjE7Z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ]dF ,:8  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9G9t" {  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?L x24*5%  
  DDX_Text(pDX, IDC_PATH, m_Path); .zr-:L5{  
  DDX_Text(pDX, IDC_NUMBER, m_Number); $6qh| >z.  
 //}}AFX_DATA_MAP gLb`pCo/  
} imVo<Je7z(  
UI0( =>L  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;RH;OE,A  
//{{AFX_MSG_MAP(CCaptureDlg) 2my_;!6T[  
 ON_WM_SYSCOMMAND() 8mCxn@yV  
 ON_WM_PAINT() EHSlK5bD,  
 ON_WM_QUERYDRAGICON() OP;v bZ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _Mi5g_  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) j9m_jv  
 ON_BN_CLICKED(ID_CHANGE, OnChange) q'+)t7!  
//}}AFX_MSG_MAP 7( #:GD  
END_MESSAGE_MAP() T*I{WW  
]q\b,)4 e  
BOOL CCaptureDlg::OnInitDialog() <c*FCblv  
{ Z/G ev"p  
 CDialog::OnInitDialog(); w3N[9w?1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0}<|7?  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3t.l5m Rg5  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Z3%}ajPu[  
 if (pSysMenu != NULL) K> %Tq  
 { CVDV)#JA  
  CString strAboutMenu; 36.Z0Z1'F>  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ke!?BZx  
  if (!strAboutMenu.IsEmpty()) 2"COP>  
  { MO[2~`,Q!  
   pSysMenu->AppendMenu(MF_SEPARATOR); q~rEq%tk  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !zBhbmlKt  
  } n#mA/H;wV  
 } GmK^}=frj  
 SetIcon(m_hIcon, TRUE); // Set big icon +|*IZ:w)  
 SetIcon(m_hIcon, FALSE); // Set small icon 9U7nKJ+iby  
 m_Key.SetCurSel(0); m.hkbet/R  
 RegisterHotkey(); .28<tEf  
 CMenu* pMenu=GetSystemMenu(FALSE); bkRLC_/d  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); n*o-Lo+Fe.  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); f0!))/rSD  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); j*d yp  
 return TRUE; // return TRUE unless you set the focus to a control :{{F *FM;  
} 97Lte5c6r  
rr/B= O7  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) XWn VgY s  
{ 5CuuG<0  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) X3(tuqmi  
 { {vs uPY  
  CAboutDlg dlgAbout; |U~<3.:m:  
  dlgAbout.DoModal(); lVd^ ^T*fh  
 } 84$nT>c  
 else ?xA:@:l/  
 { XFg 9P}"  
  CDialog::OnSysCommand(nID, lParam); 'Jiw@t<o3`  
 } 9y6-/H ,  
} ,y1PbA0m  
# q~e^A b  
void CCaptureDlg::OnPaint() xg30x C[  
{ uOKCAqYa  
 if (IsIconic()) zy?.u.4L  
 { N%kt3vmQ_  
  CPaintDC dc(this); // device context for painting zofa-7'Bn  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); toLV4BtIG  
  // Center icon in client rectangle #||}R[~P"  
  int cxIcon = GetSystemMetrics(SM_CXICON); :1^LsLr5  
  int cyIcon = GetSystemMetrics(SM_CYICON); ><RpEnWZ<  
  CRect rect; G, 44va  
  GetClientRect(&rect); ^/uA?h:]\  
  int x = (rect.Width() - cxIcon + 1) / 2; ~3^ 8>d/  
  int y = (rect.Height() - cyIcon + 1) / 2; YD <:,|H   
  // Draw the icon Mo y <@+  
  dc.DrawIcon(x, y, m_hIcon); svsqg{9z  
 } @>u}eB>Kn  
 else ,NOsFO-`<  
 { ~Io7]  
  CDialog::OnPaint(); j_/>A=OD  
 } Wfu(*  
} '>NCMB{*  
7jxslI&F  
HCURSOR CCaptureDlg::OnQueryDragIcon() )}g(b=  
{ XYjV.j\  
 return (HCURSOR) m_hIcon; H  >j  
} +j#+8Ze  
c7<wZ  
void CCaptureDlg::OnCancel() UG'Q]S#!  
{ i% w3/m  
 if(bTray) 8k2?}/+  
  DeleteIcon(); F7 5#*  
  CDialog::OnCancel(); 63^O|y\W8  
} *7:>EP  
N c1"g1JR  
void CCaptureDlg::OnAbout() &@G:G(  
{ PZ2;v<  
 CAboutDlg dlg; :C7_Jp*Qv  
 dlg.DoModal(); !4]T XH0f  
} cq5jPZ}  
1G"z<v B  
void CCaptureDlg::OnBrowse() ;}7Rjl#  
{ E08 klC0  
 CString str; >x/z7v?^I  
 BROWSEINFO bi; |"?M1*g  
 char name[MAX_PATH]; FI[A[*fi  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 3Q"<<pi!~  
 bi.hwndOwner=GetSafeHwnd(); * ;-*x6  
 bi.pszDisplayName=name; +?F[/?s5qz  
 bi.lpszTitle="Select folder"; -1 FPkp  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; L E&RY[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5BWH-2HsB  
 if(idl==NULL) 4Z1ST;  
  return; vY4\59]P  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); V\t.3vT  
 str.ReleaseBuffer(); BD68$y  
 m_Path=str; B,<da1(a  
 if(str.GetAt(str.GetLength()-1)!='\\') E d"h16j?z  
  m_Path+="\\"; e 63uLWDT  
 UpdateData(FALSE); 4h~iPn'Wl  
} +$u$<z3Q  
g@rb  
void CCaptureDlg::SaveBmp() 'GB. UKlR  
{ YbR!+ 0\g  
 CDC dc; s2teym,uG  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 0x'#_G65y  
 CBitmap bm; Mc=$/ o  
 int Width=GetSystemMetrics(SM_CXSCREEN); OJ,`  
 int Height=GetSystemMetrics(SM_CYSCREEN); zer%W%  
 bm.CreateCompatibleBitmap(&dc,Width,Height); vBRQp&YwX  
 CDC tdc; J3,fk)  
 tdc.CreateCompatibleDC(&dc); !i{aMxUP  
 CBitmap*pOld=tdc.SelectObject(&bm); Z LB4m`  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); OPwtV9%  
 tdc.SelectObject(pOld); .}^g!jm~h  
 BITMAP btm; ao%NK<Lt  
 bm.GetBitmap(&btm); &wi e]  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Uhe=h&e2k@  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); JX -' mV`  
 BITMAPINFOHEADER bih; R?68*} `7  
 bih.biBitCount=btm.bmBitsPixel; | 1E|hh@k  
 bih.biClrImportant=0; |s'Po^Sy  
 bih.biClrUsed=0; &atuK*W>  
 bih.biCompression=0; _  <WJ7  
 bih.biHeight=btm.bmHeight; 2#P* ,  
 bih.biPlanes=1; 3wOZ4<B  
 bih.biSize=sizeof(BITMAPINFOHEADER); M*!agh  
 bih.biSizeImage=size; M1 :uJkO.  
 bih.biWidth=btm.bmWidth; b8~Bazk  
 bih.biXPelsPerMeter=0; C3*gn}[  
 bih.biYPelsPerMeter=0; I2TaT(e\  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); d_CKP"TA  
 static int filecount=0; 0>C T=(A  
 CString name; 0C1pt5K  
 name.Format("pict%04d.bmp",filecount++); o4j[p3$  
 name=m_Path+name; cimp/n"  
 BITMAPFILEHEADER bfh; %{ABaeb]  
 bfh.bfReserved1=bfh.bfReserved2=0; d^RxQuA  
 bfh.bfType=((WORD)('M'<< 8)|'B'); jNTjSX  
 bfh.bfSize=54+size; /~}}"zx&  
 bfh.bfOffBits=54; `Zf^E >)  
 CFile bf; ~$ng^D  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *;1,5L  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); p=;=w_^y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); O]lSWEe  
  bf.WriteHuge(lpData,size); e91aK  
  bf.Close(); %JXE5l+pJ  
  nCount++; Y'yH;M z  
 } DKne'3pH  
 GlobalFreePtr(lpData); TFH\K{DM  
 if(nCount==1) mk1bcK9  
  m_Number.Format("%d picture captured.",nCount); DSC$i|  
 else : e]a$  
  m_Number.Format("%d pictures captured.",nCount); ]4~lYuI4  
  UpdateData(FALSE); K#EvFs`s;  
} p!>oo1&  
vtw6FX_B  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =G]1LTI  
{ aEM%R<e  
 if(pMsg -> message == WM_KEYDOWN) s}j{#xT  
 { A9f)tqbc  
  if(pMsg -> wParam == VK_ESCAPE) u xW~uEh  
   return TRUE; .P;*Dws  
  if(pMsg -> wParam == VK_RETURN) KB%"bqB|  
   return TRUE; r YogW!  
 } &0='r;*i  
 return CDialog::PreTranslateMessage(pMsg); o}W%I/s  
}  `dFq:8v  
E5)b  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [pl'|B  
{ eCN })An  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =+ytTQc*ot  
  SaveBmp(); f47Od-\-  
  return FALSE; |K6REkzr  
} |<#{"'/=  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2Or'c`|  
 CMenu pop; whpfJNz  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,RJtm%w  
 CMenu*pMenu=pop.GetSubMenu(0); /a^1_q-bX  
 pMenu->SetDefaultItem(ID_EXITICON); fBalTk;G{U  
 CPoint pt; z8QAo\_I(  
 GetCursorPos(&pt); :|_'fNd+!  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); &=#[(vl  
 if(id==ID_EXITICON) %ZNI:Uh  
  DeleteIcon(); e<=cdze  
 else if(id==ID_EXIT) [onGNq?#  
  OnCancel(); lp<g \  
 return FALSE; vV[eWd.o6M  
} /4c\K-Z;  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7N-w eX  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :,Pn3xl  
 AddIcon(); y=`2\L" O  
 return res; N$h{Yvbn  
} {U!8|(  
.z 6fv  
void CCaptureDlg::AddIcon() GqWB{$J;"  
{ 2W/?q!t  
 NOTIFYICONDATA data; \]=7!RQ\  
 data.cbSize=sizeof(NOTIFYICONDATA); kB/D!1 "  
 CString tip; CZ(/=3,3n  
 tip.LoadString(IDS_ICONTIP); & @s!<9$W  
 data.hIcon=GetIcon(0); KHgBo}6  
 data.hWnd=GetSafeHwnd(); @n(Z$)8tR  
 strcpy(data.szTip,tip); 0(mkeIzJt/  
 data.uCallbackMessage=IDM_SHELL; 7bk%mQk  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; u:[vaBh91  
 data.uID=98; V\u>"3BQw  
 Shell_NotifyIcon(NIM_ADD,&data); MO&}r7qq  
 ShowWindow(SW_HIDE); hv8P4"i v  
 bTray=TRUE; %%NlTE8*  
} -sw  .  
\<y`!"c  
void CCaptureDlg::DeleteIcon() Fe]B&n  
{ x*?x=^I{  
 NOTIFYICONDATA data; Rn{iaM2Y<  
 data.cbSize=sizeof(NOTIFYICONDATA); : y5<go8e  
 data.hWnd=GetSafeHwnd(); kBYNf =  
 data.uID=98; Hj:r[/  
 Shell_NotifyIcon(NIM_DELETE,&data); oN{Z+T :  
 ShowWindow(SW_SHOW); O) WCW<p  
 SetForegroundWindow(); XLAN Np%E  
 ShowWindow(SW_SHOWNORMAL); I3,= 0z  
 bTray=FALSE; @r#v[I  
} .Jt[(;  
$/.zm; D  
void CCaptureDlg::OnChange() lD"(MQV@0  
{ sYjpU  
 RegisterHotkey(); O>^C4c!  
} P5 K' p5}#  
*tgnYa[l  
BOOL CCaptureDlg::RegisterHotkey() | \'rP_I>  
{ 0BH_'ZW  
 UpdateData(); KcK>%%  
 UCHAR mask=0; VwOW=4`6  
 UCHAR key=0; Svc|0Ad&  
 if(m_bControl) SILQ  
  mask|=4; Ttxqf:OMf  
 if(m_bAlt) GFel(cx:K  
  mask|=2; PNaay:a|  
 if(m_bShift) ZJwrLV  
  mask|=1; m9"n4a|:  
  key=Key_Table[m_Key.GetCurSel()]; T9]HGB{  
 if(bRegistered){  /o[?D  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Q(<)KZIK  
  bRegistered=FALSE; VJdIHsI  
 } ZCB_  
 cMask=mask; o(:[r@Z0z  
 cKey=key; / C>wd   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); COW}o~3-4  
 return bRegistered; MxY/`9>E|+  
} u>TZt]h8  
4eikLRD,  
  四、小结 5dB'&8DX  
<5NF;  
  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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