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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: o08g]a  
  %8n<#0v-|4  
  一、实现方法 A8&@Vxdz  
;=,-C ;`  
  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: `6VnL)  
O z0-cM8t  
#pragma data_seg("shareddata") 3tf_\E+mIi  
HHOOK hHook =NULL; //钩子句柄 ^!S4?<v  
UINT nHookCount =0; //挂接的程序数目 ,pD sU@  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 X6 BIZ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 sR9$=91`  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey !tTv$L>  
static int KeyCount =0; ,CyX*k8o  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &'/"=lK  
#pragma data_seg() (O J/u)W^  
zU!{_Ao9  
  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。 J`5+Zngr  
ura&9~   
  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: p"hO6b%V  
tAN!LI+w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR c]E pg)E  
cKey,UCHAR cMask) 9$$  Ijf  
{ /^xv1F{  
 BOOL bAdded=FALSE; n0l|7:Mk  
 for(int index=0;index<MAX_KEY;index++){ ?sQg{1"Zr  
  if(hCallWnd[index]==0){ nZB ~l=  
   hCallWnd[index]=hWnd; gg#9I(pX  
   HotKey[index]=cKey; Ll=G+cw6P  
   HotKeyMask[index]=cMask; 6HCg<_j]  
   bAdded=TRUE; q#3T L<  
   KeyCount++; %J1'>nI!q  
   break; # QwX|x{  
  } GG>53} 7{  
 } ^)9/Wz _x  
 return bAdded; "~ID.G|<  
} SOR\oZ7  
//删除热键 /}@F q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zY\u" '4  
{ PFp!T [)  
 BOOL bRemoved=FALSE; \YzKEYx+  
 for(int index=0;index<MAX_KEY;index++){ : 2%eh  
  if(hCallWnd[index]==hWnd){ HjK8y@j  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (5jKUQ8Q>  
    hCallWnd[index]=NULL; FL\pgbI  
    HotKey[index]=0; ^rfR<Q`  
    HotKeyMask[index]=0; UUfM 7gq  
    bRemoved=TRUE; q,ie)`  
    KeyCount--; y?UJ <QAi  
    break; TI3xt-/  
   } o`n8Fk}i  
  } P-ZvW<M  
 } XcoX8R%U  
 return bRemoved; cV>?*9z0  
} p|->z  
T2rwK2  
`>\ ~y1  
  DLL中的钩子函数如下: Vw w 211  
Kq")|9=d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) VL*5  
{ \9,lMK[b  
 BOOL bProcessed=FALSE; sBZn0h@  
 if(HC_ACTION==nCode) ?M'CTz}<\  
 { G)~>d/  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 wm#(\dj  
   switch(wParam) =b$g_+  
   {  7Z2D}O +  
    case VK_MENU: &PPnI(s^K  
     MaskBits&=~ALTBIT; EC$F|T0f  
     break; B)7:*Kj  
    case VK_CONTROL: 8WDL.IO  
     MaskBits&=~CTRLBIT; e*'bY;8lo  
     break; }BS EK<W  
    case VK_SHIFT: vfqXHc unj  
     MaskBits&=~SHIFTBIT; X$==J St  
     break; {P?Ge  
    default: //judge the key and send message  Fw[1Aa#  
     break; hvTc( 0;mB  
   } <9>L^GgXA  
   for(int index=0;index<MAX_KEY;index++){ 1.p ?1"4\u  
    if(hCallWnd[index]==NULL) " oxUKT  
     continue; P4"BX*x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ij] ~n  
    { 9HR1m 3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;s,1/ kA  
     bProcessed=TRUE; HAE$Np|>a  
    } J37vA zK%  
   } pm+E)z6Yo  
  } w@2NXcmw  
  else if((lParam&0xc000ffff)==1){ //有键按下 w +UB XW  
   switch(wParam) 4;~xRg;u&*  
   { ww %c+O/  
    case VK_MENU: br88b`L  
     MaskBits|=ALTBIT; :@ &e~QP(  
     break; JGq9RB]D$  
    case VK_CONTROL: @8J*vY =e  
     MaskBits|=CTRLBIT; G?F!Z"S  
     break; X_-/j.  
    case VK_SHIFT: IrRy1][Qr  
     MaskBits|=SHIFTBIT; T#rUbi>""  
     break; &O+S [~  
    default: //judge the key and send message Z]LP18m9kl  
     break; /b{@']  
   } ]gHrqi%  
   for(int index=0;index<MAX_KEY;index++){ dj084q7  
    if(hCallWnd[index]==NULL) qK;J:GT>  
     continue; GKg #nXS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $R ze[3  
    { *RJD^hu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =Cf@!wZ^  
     bProcessed=TRUE;  XU"G  
    } |o eg'T  
   } UBv#z&@[  
  } m6 M/G  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 g#{7qmM  
   for(int index=0;index<MAX_KEY;index++){ eY Rd#w  
    if(hCallWnd[index]==NULL) Zu#^a|PE*  
     continue; }6u}?>S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) a)Ht(*/B  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T: '<:*pD  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 q\P{h ij  
   } *@lVesC2  
  } @?tR-L<u  
 } zwUZ*Se  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); S5m.oHJI*  
} 4UL"f<7 T  
l-IA Q!d  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Tw/7P~*  
2bXCFv7}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3NwdE/x\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q=cnY+p>  
t:.X=/02  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: U>n.+/ss  
p&XuNk  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <!W9E M  
{ fCb&$oRr!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) \SmYxdU'>  
 { T;kh+ i  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Ktuv a3=>N  
  SaveBmp(); +;@R&Y  
  return FALSE; ak}k e  
 } h _c11#  
 …… //其它处理及默认处理 j*VYUM@y1\  
} 29@m:=-}7  
s*CBYzOm  
$\oe}`#o  
  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。 &xj,.;  
5 a&a-(  
  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。 9Z2aFW9  
=;8q`  
  二、编程步骤 H-& ktQWK3  
xjDaA U,  
  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"; vKbGG   
:d<F7`k H  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; yF XPY=EQ  
i[vN3`*B  
  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; 'Um\m  
sZa>+  
  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; r_^]5C\  
coXm*X>z  
  5、 添加代码,编译运行程序。 $KRpu<5i}  
YTe8C9eO  
三、程序代码 XX1Iw {o9:  
w(%$~]h  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL noWwX  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) gU@.IOg  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8(6mH'^y  
#if _MSC_VER > 1000 >tkU+$;-  
#pragma once >Co@K^'  
#endif // _MSC_VER > 1000 t(^Lh.<a  
#ifndef __AFXWIN_H__ 7B gA+Fz  
#error include 'stdafx.h' before including this file for PCH rj eKG-Z@  
#endif :n}t7+(>U  
#include "resource.h" // main symbols UD'e%IVw  
class CHookApp : public CWinApp ltl(S Ii  
{ +P*,i$MV  
 public: <~5$<L4  
  CHookApp(); "Bn]-o|r  
  // Overrides vdulrnGqL  
  // ClassWizard generated virtual function overrides `Z#]lS?  
  //{{AFX_VIRTUAL(CHookApp) pKL^ <'w0  
 public: iaaD1 <m  
  virtual BOOL InitInstance(); b\"2O4K,)  
  virtual int ExitInstance(); F>q%~  
  //}}AFX_VIRTUAL rYA4(rYq  
  //{{AFX_MSG(CHookApp) xe1xP@e?  
  // NOTE - the ClassWizard will add and remove member functions here. O;;vz+ j  
  // DO NOT EDIT what you see in these blocks of generated code ! ^@q $c  
  //}}AFX_MSG nR?m,J  
  DECLARE_MESSAGE_MAP() ;Uj=rS`Q  
}; %X\rP,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); f,0oCBLPO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sv>c)L}I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 03y5$kQ  
BOOL InitHotkey(); %lK]m`(  
BOOL UnInit(); 'q*/P&x5  
#endif Dmk~t="Y  
CY8=prC  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. HuL9' M  
#include "stdafx.h" L5>.ku=T  
#include "hook.h" 9y"\]G77E  
#include <windowsx.h> ,OO0*%  
#ifdef _DEBUG r`=!4vY2  
#define new DEBUG_NEW z9*7fT  
#undef THIS_FILE  N5GQ2V  
static char THIS_FILE[] = __FILE__; -}<W|r  
#endif cW, 6 MAQo  
#define MAX_KEY 100 852Bh'u_  
#define CTRLBIT 0x04 Qte'f+  
#define ALTBIT 0x02 `ZAGseDd~  
#define SHIFTBIT 0x01 Kd,7x'h`E  
#pragma data_seg("shareddata") BB m;QOBU  
HHOOK hHook =NULL; A?OaP  
UINT nHookCount =0; GfT`>M?QGK  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey bX]$S 5c_u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT U7cGr\eUu  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey R*psL&N  
static int KeyCount =0; zFV?,"\r  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift "^@0zy@x  
#pragma data_seg() =C2,?6!  
HINSTANCE hins; 4qEeN-6h  
void VerifyWindow(); GCPSe A~cx  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) HveOG$pT  
//{{AFX_MSG_MAP(CHookApp) DJhCe==$v  
// NOTE - the ClassWizard will add and remove mapping macros here. IE9A _u*  
// DO NOT EDIT what you see in these blocks of generated code! x k5Z&z  
//}}AFX_MSG_MAP /7<l`RSr  
END_MESSAGE_MAP() KrT+Svm  
l< RztzUw  
CHookApp::CHookApp() (f|3(u'e?  
{ pVm'XP  
 // TODO: add construction code here, as6YjE.Yy  
 // Place all significant initialization in InitInstance m-No 8)2yA  
} 7[W! Nx  
Rm!Iv&{  
CHookApp theApp; ~nG?>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {__"Z<  
{ 6rOd80\  
 BOOL bProcessed=FALSE; :X;' 37o#q  
 if(HC_ACTION==nCode) hpJi,4r.d  
 { hK&/A+*  
  if((lParam&0xc0000000)==0xc0000000){// Key up <$'OSN`!  
   switch(wParam) ]\<^rEU  
   { ?-0>Wbg  
    case VK_MENU: [SJ*ks,]  
     MaskBits&=~ALTBIT; f#UT~/~bL2  
     break; {` Lem  
    case VK_CONTROL: cvvba 60  
     MaskBits&=~CTRLBIT; lf\]^yM #  
     break; `PR)7}/<  
    case VK_SHIFT: aJ1<X8  
     MaskBits&=~SHIFTBIT; r9uuVxBD  
     break; !bG%@{WT  
    default: //judge the key and send message (1(dL_?  
     break; 3Vl?;~ :5  
   } Q<V?rPAcx  
   for(int index=0;index<MAX_KEY;index++){  *w538Vb  
    if(hCallWnd[index]==NULL) V '4sOn  
     continue; D?3^>h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Yvu!Q  
    { fWywegh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 0x\bDWZ_  
     bProcessed=TRUE; gUB%6vG\I  
    } Gt^Fj&^  
   } OXuBtW*,z+  
  } q8{) 27f,  
  else if((lParam&0xc000ffff)==1){ //Key down o'Byuct  
   switch(wParam) UmSy p\i  
   { U1t7XZ3e  
    case VK_MENU: g9`z]qGWS:  
     MaskBits|=ALTBIT; uMToVk`Uv  
     break; J ;=~QYn[  
    case VK_CONTROL: x 2\ ,n  
     MaskBits|=CTRLBIT; ~I%m[fQ S  
     break; W"_")V=QBz  
    case VK_SHIFT: V3NQij(  
     MaskBits|=SHIFTBIT; #,1Kum bG3  
     break; 2R2ws.}  
    default: //judge the key and send message {re<S<j&  
     break; lV-b   
   } `r:n[N=Y&  
   for(int index=0;index<MAX_KEY;index++) ShdE!q7  
   { ;{79d8/=  
    if(hCallWnd[index]==NULL) tB_GEt2M  
     continue; ^b]h4z$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "+iPeRF!hU  
    { x4PA~R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); c_ e2'K:  
     bProcessed=TRUE; fG107{!g=  
    } db%o3>>e  
   } ]4m;NId  
  } =G%k|  
  if(!bProcessed){ tk@ T-;  
   for(int index=0;index<MAX_KEY;index++){ 0wCJNXm  
    if(hCallWnd[index]==NULL) -rSp gk0wL  
     continue; @Q;%hb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \Q"j^4   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0yhC_mI  
   } N|OI~boV%  
  } _H9.A I  
 } 9gFema{U  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &>zzR$#1  
} -s5j^U{h|  
[eebIJs  
BOOL InitHotkey() d|!FI/  
{ 2HNKq<  
 if(hHook!=NULL){ (,wIbwa  
  nHookCount++; ^u@"L  
  return TRUE; {2EIvKu3:  
 } owDp?Sy}E  
 else bhqBFiuhH  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); $[L~X M  
  if(hHook!=NULL) ALVHKL2  
   nHookCount++; b!C\J  
  return (hHook!=NULL); \a+.~_iL|  
} 5\MCk"R!  
BOOL UnInit() slC 38  
{ tONX<rA|]  
 if(nHookCount>1){ #1-,s.)  
  nHookCount--; a\60QlAk~  
  return TRUE; 6;WfsG5  
 } {Jf["Z  
 BOOL unhooked = UnhookWindowsHookEx(hHook);  uIOnP  
 if(unhooked==TRUE){ o}q>oa b z  
  nHookCount=0; +{(f@,&~{  
  hHook=NULL; ZS*PY,  
 } ,%>]  
 return unhooked; ,@mr})s  
} ?RyeZKf  
z>rl7&[@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v]UT1d=_T  
{ *E*= ;BG  
 BOOL bAdded=FALSE; 'aYUF&GG  
 for(int index=0;index<MAX_KEY;index++){ V\$'3(*  
  if(hCallWnd[index]==0){ ]}t6V]`Q  
   hCallWnd[index]=hWnd; $#VEC0  
   HotKey[index]=cKey; .ME>ICA  
   HotKeyMask[index]=cMask; a<c]N:1  
   bAdded=TRUE; dux.Z9X?  
   KeyCount++; cR'l\iv+  
   break; e :(7$jo  
  } w;@NYMK)  
 } cEI "  
 return bAdded; ]_!5g3VQh  
} >|{n";n&  
U($bR|%D  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LH7m >/LJr  
{ :w|ef;  
 BOOL bRemoved=FALSE; [Dr'  
 for(int index=0;index<MAX_KEY;index++){ BvQMq5&  
  if(hCallWnd[index]==hWnd){ 1b^e4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &PQhJ#YG  
    hCallWnd[index]=NULL; _{Q)5ooP  
    HotKey[index]=0; U"nk AW  
    HotKeyMask[index]=0; ,%)O/{p_  
    bRemoved=TRUE; ,X+LJe$  
    KeyCount--; _yH{LUIj  
    break; =E6ND8l@2  
   } ]Sj<1tx7f  
  } yx0wR  
 } PIk2mX/D_6  
 return bRemoved; in-|",O`Z  
} t zn1|  
]ySm|&aU  
void VerifyWindow() > 2)@(f~g  
{ \9 ,a"g  
 for(int i=0;i<MAX_KEY;i++){ !3O8B0K)v  
  if(hCallWnd!=NULL){ O52B  
   if(!IsWindow(hCallWnd)){ 73Zx`00  
    hCallWnd=NULL; JWZG)I]r  
    HotKey=0; =VC"X?N  
    HotKeyMask=0; V{jQ=<)@e  
    KeyCount--; JRti2Mu  
   } b suGZ  
  } z) :LF<  
 } b/[$bZD5o  
} v2w|?26Lf  
O0Z !*Hy  
BOOL CHookApp::InitInstance() ^/6LVB*  
{ 1zNh& "  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6zbqv6  
 hins=AfxGetInstanceHandle(); <M){rce  
 InitHotkey(); VQ}N& H)`  
 return CWinApp::InitInstance();  }?eO.l{  
} p{@jM  
?04jkq&  
int CHookApp::ExitInstance() 5#275Hyv  
{ W;Y"J_  
 VerifyWindow(); ;H' ,PjU  
 UnInit(); V ,+&.A23  
 return CWinApp::ExitInstance(); lJHU1 gu  
} @\*`rl]  
.ZOG,h+8  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file WswM5RN  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _cc3 7[  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 8'>yB  
#if _MSC_VER > 1000 $^TxLv  
#pragma once uSsP'qd  
#endif // _MSC_VER > 1000 HNUpgNi  
i'cGB5-j  
class CCaptureDlg : public CDialog ]EN+^i1F[  
{ j.]ln}b/'+  
 // Construction rF^H\U:w  
 public: .8%&K0  
  BOOL bTray; &0b\E73  
  BOOL bRegistered; pyw]ydB  
  BOOL RegisterHotkey(); ;S_Imf0$v  
  UCHAR cKey; X-4(oE  
  UCHAR cMask; iv!;gMco  
  void DeleteIcon(); +X%pUe  
  void AddIcon();  l;;,[xhq  
  UINT nCount; UuKW`(?^  
  void SaveBmp(); QBYY1)6S,  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 1La?x'{2MP  
  // Dialog Data xcQD]"   
  //{{AFX_DATA(CCaptureDlg) *Uw"`l  
  enum { IDD = IDD_CAPTURE_DIALOG }; gB<1;_KW  
  CComboBox m_Key; m2a [ E0  
  BOOL m_bControl; ZGw 6Bd_I  
  BOOL m_bAlt; +B '<0  
  BOOL m_bShift; X :#}E7]j  
  CString m_Path; {^@vCBE+  
  CString m_Number; (.J6>"K<  
  //}}AFX_DATA M!`&Z9N  
  // ClassWizard generated virtual function overrides 7VIfRN{5n  
  //{{AFX_VIRTUAL(CCaptureDlg) &q7}HO/ @  
 public: !#Pr'm/,mu  
  virtual BOOL PreTranslateMessage(MSG* pMsg); {EjzJr>  
 protected: SgWLs%B  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x%yzhIRR  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  ^:^  
  //}}AFX_VIRTUAL []-<-TqJ  
  // Implementation /B 53Z[yL  
 protected:  l( WF  
  HICON m_hIcon; 6fm oI K{  
  // Generated message map functions w-"tA`F4  
  //{{AFX_MSG(CCaptureDlg) F05]6NVv  
  virtual BOOL OnInitDialog(); 6Z@?W  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); l3Qt_I)L  
  afx_msg void OnPaint(); mIe 5{.m#  
  afx_msg HCURSOR OnQueryDragIcon(); dDbH+kqO  
  virtual void OnCancel(); Wh)>E!~ 9  
  afx_msg void OnAbout(); %oOSmt  
  afx_msg void OnBrowse(); Ow N~-).%-  
  afx_msg void OnChange(); P67*-Ki  
 //}}AFX_MSG ,7I    
 DECLARE_MESSAGE_MAP() "]bOpk T  
}; yJ:rry  
#endif F Jp<J  
7\AoMk}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file m;J'y2h =$  
#include "stdafx.h" yRivf.wH  
#include "Capture.h" ok1w4#%,  
#include "CaptureDlg.h" \;+TZ1i_  
#include <windowsx.h> 0}` 0!Kv  
#pragma comment(lib,"hook.lib") WR9-HPF  
#ifdef _DEBUG }vb.>hy  
#define new DEBUG_NEW z%;_h-  
#undef THIS_FILE lMmP]{.>$  
static char THIS_FILE[] = __FILE__; C';Dc4j  
#endif 2c'<rkA  
#define IDM_SHELL WM_USER+1 *&z !y/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RGLJaEl !  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s$ kvLy<  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; SN 4JX  
class CAboutDlg : public CDialog -C2[ZP-  
{ sk5B} -  
 public: zWrynJ}s  
  CAboutDlg(); L0R$T=~%)  
  // Dialog Data %KPQ|^WE  
  //{{AFX_DATA(CAboutDlg) ]*X z~Ox2  
  enum { IDD = IDD_ABOUTBOX }; #h#_xh'  
  //}}AFX_DATA bt"5.nm  
  // ClassWizard generated virtual function overrides !ir%Pz ^)  
  //{{AFX_VIRTUAL(CAboutDlg) Elt" tJ  
 protected: 9+b){W  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tmQ,>   
  //}}AFX_VIRTUAL 6s t^-L  
  // Implementation _4 YT2k  
 protected: Qoa&]]  
  //{{AFX_MSG(CAboutDlg) uvRX{q 4  
  //}}AFX_MSG Eb8~i_B-  
  DECLARE_MESSAGE_MAP() I%jlM0ZUI"  
}; ub2B!6f a  
JkEITuTth  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) sD9OV6^{?K  
{ @,{Qa!A>l  
 //{{AFX_DATA_INIT(CAboutDlg) O<J<)_W)  
 //}}AFX_DATA_INIT l\TL=8u2c  
} 6n\){dkZ~  
T5-Yqz  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) d/b\:[B@  
{ zhe~kI  
 CDialog::DoDataExchange(pDX); g77:92  
 //{{AFX_DATA_MAP(CAboutDlg) },;Z<(  
 //}}AFX_DATA_MAP tqpSir  
} I  :8s3;  
/A-VT  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) P\h1%a/D  
 //{{AFX_MSG_MAP(CAboutDlg) k_nQmU>  
 // No message handlers 7e[&hea  
 //}}AFX_MSG_MAP R*H-QH/H1  
END_MESSAGE_MAP() &srD7v9M8  
hb(H-`16  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "g/UpnH  
: CDialog(CCaptureDlg::IDD, pParent) K."W/A!  
{ Rl (+TE  
 //{{AFX_DATA_INIT(CCaptureDlg) /2cn`dR,  
  m_bControl = FALSE; wauM|/KG  
  m_bAlt = FALSE; &w{z  
  m_bShift = FALSE; "$3~):o  
  m_Path = _T("c:\\"); -,ojZFyRi  
  m_Number = _T("0 picture captured."); {rzQ[_)EC  
  nCount=0; 39x 4(  
  bRegistered=FALSE; %6x3 G  
  bTray=FALSE; OX}ZdM!&f  
 //}}AFX_DATA_INIT V"T5<HA9  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @P">4xVX{  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); M 9 N'Hk=  
} u63Q<P<  
As??_=>4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Z ?ATWCa  
{ aqgm  
 CDialog::DoDataExchange(pDX); uM[[skc  
 //{{AFX_DATA_MAP(CCaptureDlg) 9Qq%Fw_  
  DDX_Control(pDX, IDC_KEY, m_Key); Icx)+Mq  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ;,Os3  
  DDX_Check(pDX, IDC_ALT, m_bAlt); "2:#bXM-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [7l5p(=  
  DDX_Text(pDX, IDC_PATH, m_Path); N_p^DP   
  DDX_Text(pDX, IDC_NUMBER, m_Number); pIPjTQ?cq  
 //}}AFX_DATA_MAP } : T }N]  
} <!-#]6  
!N/?b^y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0IQ|`C.  
//{{AFX_MSG_MAP(CCaptureDlg) ]{AHKyA{:  
 ON_WM_SYSCOMMAND() ~7H?tp.Dw  
 ON_WM_PAINT() X=VaBy4#  
 ON_WM_QUERYDRAGICON() 4rypT-%^;  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) i x_a  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) jF{)2|5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _@Y17L.  
//}}AFX_MSG_MAP LbnF8tj}h  
END_MESSAGE_MAP() 'EB5#  
s5ILl wr  
BOOL CCaptureDlg::OnInitDialog() F~3 &@TWi  
{ m@yx6[E#  
 CDialog::OnInitDialog(); {sUc2vR  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7 .xejz  
 ASSERT(IDM_ABOUTBOX < 0xF000); ,%KMi-w]q,  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ( `d_DQ  
 if (pSysMenu != NULL) ah!fQLMH  
 { qX]ej 2  
  CString strAboutMenu; _<jccQ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ! 6_tdZ  
  if (!strAboutMenu.IsEmpty()) *jl_,0g]  
  { !^3j9<|@'  
   pSysMenu->AppendMenu(MF_SEPARATOR); 7mYBxE/  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /?C6 oj1  
  } ;_1 >nXh  
 } o2^?D`Jr  
 SetIcon(m_hIcon, TRUE); // Set big icon ?e23[  
 SetIcon(m_hIcon, FALSE); // Set small icon h}%yG{'/M=  
 m_Key.SetCurSel(0); ,]=Qg n  
 RegisterHotkey(); aT=V/Xh}d  
 CMenu* pMenu=GetSystemMenu(FALSE); .-: 6L2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {ZgycMS  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *4 Kc "M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); QezDm^<  
 return TRUE; // return TRUE unless you set the focus to a control S4%MnT6Uy  
} )Ju$PrO  
cWa> rUsF  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) DO? bJ01  
{ =e]Wt/AQ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 1F?ylZ|~  
 { 8;P_KRaE  
  CAboutDlg dlgAbout; _1?Fy u&<5  
  dlgAbout.DoModal(); W97 &[([  
 } r<.*:]L  
 else dYhLk2  
 { mWU*}-M  
  CDialog::OnSysCommand(nID, lParam); Q$2^m(?;  
 } |)Sx"B)  
} yGPi9j{QXq  
+,}CuF  
void CCaptureDlg::OnPaint() 0'Qo eFKG  
{ 2 Xc,c*r  
 if (IsIconic()) z(beT e  
 {  h93  
  CPaintDC dc(this); // device context for painting LWP&Si*j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q8vRUlf  
  // Center icon in client rectangle :=%`\\  
  int cxIcon = GetSystemMetrics(SM_CXICON); XcQ'(  
  int cyIcon = GetSystemMetrics(SM_CYICON);   S?m4  
  CRect rect; .:jfNp~jt  
  GetClientRect(&rect); +luW=j0V  
  int x = (rect.Width() - cxIcon + 1) / 2; "O{:jfq  
  int y = (rect.Height() - cyIcon + 1) / 2; ^ P=CoLFa  
  // Draw the icon HUY1nb=  
  dc.DrawIcon(x, y, m_hIcon); As*59jkB  
 } Q_n9}LanP  
 else y8\4TjS1  
 { |h%fi-a:  
  CDialog::OnPaint(); ZBfB4<M9xS  
 } `!g XA.9Uv  
} zgHF-KEV  
tL@m5M%:N2  
HCURSOR CCaptureDlg::OnQueryDragIcon() N @sVA%L.  
{ Ci^tP~)&"  
 return (HCURSOR) m_hIcon; $kk!NAW  
} W>]=0u4  
Z=P=oldH  
void CCaptureDlg::OnCancel() lr@H4EJ{  
{ dNcP_l/A  
 if(bTray) gw9:1S  
  DeleteIcon(); a0x/? )DO  
  CDialog::OnCancel(); 6995r%  
} *G0r4Ui$  
T1r^.;I:  
void CCaptureDlg::OnAbout() CI6qDh6  
{ Qws#v}xF  
 CAboutDlg dlg; zbL6TP@=  
 dlg.DoModal(); OQh(qa  
} zos#B30  
5%6r,?/7KM  
void CCaptureDlg::OnBrowse() lGP'OY"Q  
{ UBxQ4)%  
 CString str; !'EE8Tp~F  
 BROWSEINFO bi; $:MO/Su z{  
 char name[MAX_PATH]; B%Sp mx8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); K%"cVqb2V  
 bi.hwndOwner=GetSafeHwnd(); 1~#p3)B  
 bi.pszDisplayName=name; ?QXo]X;f&  
 bi.lpszTitle="Select folder"; D2}nJFR ]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; {CR'Z0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,*@6NK,.  
 if(idl==NULL) A">A@`}  
  return; -!]dU`:(X  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); nY<hfqof  
 str.ReleaseBuffer(); D;al(q  
 m_Path=str; vMOit,{  
 if(str.GetAt(str.GetLength()-1)!='\\') 1JoRP~mMxa  
  m_Path+="\\"; #5x[Z[m  
 UpdateData(FALSE); N;6WfdA-  
} H A(e  
pJE317 p'  
void CCaptureDlg::SaveBmp() U ]6 Hml;l  
{ yegTKoY  
 CDC dc; jE{2rw$ZJ?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); l`R/WC  
 CBitmap bm; K-nf@o+  
 int Width=GetSystemMetrics(SM_CXSCREEN); hOSkxdi*^  
 int Height=GetSystemMetrics(SM_CYSCREEN); nn_j"Nu  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #ab=]}2W_g  
 CDC tdc; Mb(aI!;A  
 tdc.CreateCompatibleDC(&dc); N5=; PZub  
 CBitmap*pOld=tdc.SelectObject(&bm); -3<5,Q{G+  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ryq95<lF  
 tdc.SelectObject(pOld); Y?z@)cL  
 BITMAP btm; 8vcV-+x  
 bm.GetBitmap(&btm); }GCt)i_  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Oj*3'?<7=  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0iX;%SPYz  
 BITMAPINFOHEADER bih; \Podyh/;?  
 bih.biBitCount=btm.bmBitsPixel; ^.J F?2T/  
 bih.biClrImportant=0; O9k9hRE]z  
 bih.biClrUsed=0; aMFUJrXo  
 bih.biCompression=0; n(b(H`1n  
 bih.biHeight=btm.bmHeight; ##!) }i  
 bih.biPlanes=1; wK CHG/W  
 bih.biSize=sizeof(BITMAPINFOHEADER); y$At$i>u  
 bih.biSizeImage=size; XY8s\DK  
 bih.biWidth=btm.bmWidth; \@4_l?M  
 bih.biXPelsPerMeter=0; 8JUUK(&Z  
 bih.biYPelsPerMeter=0; V(Ps6jR"BS  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); rQbL86+  
 static int filecount=0; t,.MtU>K@  
 CString name; & ;+u.X  
 name.Format("pict%04d.bmp",filecount++); 5B? >.4R  
 name=m_Path+name; wvm`JOP:A  
 BITMAPFILEHEADER bfh; 5xi f0h-`  
 bfh.bfReserved1=bfh.bfReserved2=0; y.~y*c6,g  
 bfh.bfType=((WORD)('M'<< 8)|'B'); d\dt}&S 5  
 bfh.bfSize=54+size; Eq9TJt'3y  
 bfh.bfOffBits=54; <m80e),~  
 CFile bf; _n(NPFV  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _{o=I?+]  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); lu(<(t,Lbs  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +xwz.:::  
  bf.WriteHuge(lpData,size); p IXBJk  
  bf.Close(); 5yO6szg  
  nCount++; 6v0^'}  
 } OZ1+`4 v  
 GlobalFreePtr(lpData); O edL?4  
 if(nCount==1) tH<v1LEZN  
  m_Number.Format("%d picture captured.",nCount); ZgLO[Bj  
 else dvk? A$  
  m_Number.Format("%d pictures captured.",nCount); tqIz$84G  
  UpdateData(FALSE); s&p*.I]@>  
} 0}c *u) ,  
l/_3H\iM  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Xz0jjO,  
{ 0CxQ@~ttl  
 if(pMsg -> message == WM_KEYDOWN) A?3hNvfx  
 { lkV% k1w  
  if(pMsg -> wParam == VK_ESCAPE) :QsGwhB  
   return TRUE; gO?+:}!  
  if(pMsg -> wParam == VK_RETURN) /b20!3  
   return TRUE; glh2CRUj  
 } SG8H~]CO)  
 return CDialog::PreTranslateMessage(pMsg); z_eP  
} 5,'?NEyw  
[SgP1>M  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /J8AnA1  
{ 86~HkHliv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ /!UuGm   
  SaveBmp(); phUno2fH  
  return FALSE; 0yXUVKq3  
} Z bxd,|<|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 0%}$@H5i  
 CMenu pop; _n2PoE:5@P  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); @<\f[Znto  
 CMenu*pMenu=pop.GetSubMenu(0); Y2j>lf?8  
 pMenu->SetDefaultItem(ID_EXITICON); <oPo?r|oM|  
 CPoint pt; VY@uQ#&A  
 GetCursorPos(&pt); /g712\?M4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); N<:5 r  
 if(id==ID_EXITICON) *J?QXsg  
  DeleteIcon(); mUzNrkG(G  
 else if(id==ID_EXIT) 7[QU *1bk  
  OnCancel(); __$IbF5  
 return FALSE; B N@*CG  
} >\8Bu#&s4  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); tuK"}HepB  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =R!=uml(  
 AddIcon(); +M (\R?@gr  
 return res; Fm{Ri=X<:  
} 52tIe|KwL  
R 3 Eh47  
void CCaptureDlg::AddIcon() =V_} z3b  
{ $ # @G!  
 NOTIFYICONDATA data; }+QgRGQ  
 data.cbSize=sizeof(NOTIFYICONDATA); 31wact^  
 CString tip; {.z2n>1J{T  
 tip.LoadString(IDS_ICONTIP); |v}"UW(y  
 data.hIcon=GetIcon(0); z['>`Kt  
 data.hWnd=GetSafeHwnd(); *4r 1g+0  
 strcpy(data.szTip,tip); 9">}@1k  
 data.uCallbackMessage=IDM_SHELL; WYwsTsG{_  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1fQvh/2  
 data.uID=98; >ALU}o/  
 Shell_NotifyIcon(NIM_ADD,&data); 09eS&J<R  
 ShowWindow(SW_HIDE); lKI1bs]i  
 bTray=TRUE; 6CLrP} u  
} 95aa  
J:'cj5@  
void CCaptureDlg::DeleteIcon() WO)rJr!C  
{ 6t TLyI$+  
 NOTIFYICONDATA data; r`i<XGPJ%  
 data.cbSize=sizeof(NOTIFYICONDATA); ]OM|Oo  
 data.hWnd=GetSafeHwnd(); 06pLa3oi  
 data.uID=98; s9~W( Wi  
 Shell_NotifyIcon(NIM_DELETE,&data); J+[&:]=P  
 ShowWindow(SW_SHOW); P`5@$1CJ  
 SetForegroundWindow(); \)DP(wC  
 ShowWindow(SW_SHOWNORMAL); f$iv+7<B^  
 bTray=FALSE; FsY}mql  
} vX)JJ|g  
4/S 4bk*8  
void CCaptureDlg::OnChange() 7h<Q{X<A  
{ 6~0S%Hz   
 RegisterHotkey(); Y1H8+a5@  
} q+3Z3v  
,!|/|4vh  
BOOL CCaptureDlg::RegisterHotkey() gT'c`3Gkz  
{ f3|ttUX  
 UpdateData(); L"1UUOKy  
 UCHAR mask=0; -$?xR](f  
 UCHAR key=0; wS <d8gw  
 if(m_bControl) Eg5|XV  
  mask|=4; &iR>:=ks N  
 if(m_bAlt) 3) zanoYHi  
  mask|=2; 4!d&Zc>C4  
 if(m_bShift) v6HBO#F'V{  
  mask|=1; m-dne/%_  
  key=Key_Table[m_Key.GetCurSel()]; 234 OJ?  
 if(bRegistered){ e4yd n  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); $s4rG=q  
  bRegistered=FALSE; c#$B;?  
 } X7?p$!M6;B  
 cMask=mask; K\nN2y  
 cKey=key; dfiA- h  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \ZigG{  
 return bRegistered; xSs);XO,  
} x %L2eXL  
b>hNkVI  
  四、小结 (8qMF{  
7UejK r  
  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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