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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: u6S0t?Udap  
  ;KZtW  
  一、实现方法 % Dr4~7=7a  
l SVW}t  
  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: @BHS5^|  
Sfoy8<j  
#pragma data_seg("shareddata") rM >V=|9,  
HHOOK hHook =NULL; //钩子句柄 CAo )v,f  
UINT nHookCount =0; //挂接的程序数目 DP6{HR$L  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4gkV]" H!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +^&v5[$R  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey T m@1q!G  
static int KeyCount =0; =`\,2Nb  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 b#I*~  
#pragma data_seg() VgZaDd;  
<K=B(-~  
  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。 /@nRL  
c%LB|(@j{  
  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: g<T`F  
@aV~.!!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Vg,>7?]6h  
cKey,UCHAR cMask) yL3<X w|  
{ 7U[L\1zS  
 BOOL bAdded=FALSE; | 8L`osg  
 for(int index=0;index<MAX_KEY;index++){ Va |9)m  
  if(hCallWnd[index]==0){ kW2nrkF  
   hCallWnd[index]=hWnd; +S5_J&~  
   HotKey[index]=cKey; r(in]7  
   HotKeyMask[index]=cMask; gM5p1?E  
   bAdded=TRUE; X,Q=n2X?3  
   KeyCount++; X-N$+[#  
   break; IL6f~!  
  } };|PFWs  
 } 5 *pN<S  
 return bAdded; G>ptwB81KM  
} e9_O/iN  
//删除热键 C8W`Oly:]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) AIxBZt7{b  
{ > v!c\  
 BOOL bRemoved=FALSE; BQ}.+T\  
 for(int index=0;index<MAX_KEY;index++){ 7" STS7_  
  if(hCallWnd[index]==hWnd){ $H:h(ia:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Qdr-GODx  
    hCallWnd[index]=NULL; :%b2;&A[  
    HotKey[index]=0; LI|HET_  
    HotKeyMask[index]=0; z vylL M  
    bRemoved=TRUE; U1HD~  
    KeyCount--; 1DlcO>#@  
    break; V-ouIqnI  
   } 'iISbOM  
  } 6j"I5,-~!  
 } C.B}Py+   
 return bRemoved; WKIiJ{@L  
} L,A-G"z0Z  
6L> "m0  
pOI`,i}.  
  DLL中的钩子函数如下: 6p=xgk-q  
u r.T YKF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) y" 6~9j  
{ X>GY*XU  
 BOOL bProcessed=FALSE; U:4Og8  
 if(HC_ACTION==nCode) rWfurB5f  
 { T!xy^n]}  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Q%VR@[`\  
   switch(wParam) P"_}F  
   {  m3xj5]#^$  
    case VK_MENU: ?M-8Fp3 +  
     MaskBits&=~ALTBIT; j _9<=Vu  
     break; >.wd)  
    case VK_CONTROL: OUk5c$M(  
     MaskBits&=~CTRLBIT; IZv, Wo  
     break; 5F sj_wFk  
    case VK_SHIFT: yqb <<4I  
     MaskBits&=~SHIFTBIT; 2d;xAX]  
     break; `L*;58MA  
    default: //judge the key and send message !@Vp Bl  
     break; >Wit"p  
   } ZFuJ2 :  
   for(int index=0;index<MAX_KEY;index++){ @$yYljP  
    if(hCallWnd[index]==NULL) |wb(rua  
     continue; ?| LB:8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y'O{8Q8T  
    { 8U:dgXz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); EbYH?hPo  
     bProcessed=TRUE; UG'U D"  
    } /N{@g.edL  
   } .d!*<`S|  
  } n9/0W%X>  
  else if((lParam&0xc000ffff)==1){ //有键按下 <.(/#=2  
   switch(wParam) z slEUTj)  
   { u&_U CJCf  
    case VK_MENU: j4SG A#;v  
     MaskBits|=ALTBIT; Bt7v[Ot   
     break; A^@<+?  
    case VK_CONTROL: L.:QI<n  
     MaskBits|=CTRLBIT; _%TeTNY#  
     break; ^r :A^q  
    case VK_SHIFT: )9jQ_  
     MaskBits|=SHIFTBIT; N&h!14]{ Z  
     break; 6Oba}`)q9  
    default: //judge the key and send message 8 (h  
     break; dsZ ( D:)  
   } sK/"  
   for(int index=0;index<MAX_KEY;index++){ w ]-iM  
    if(hCallWnd[index]==NULL) "s<l Lgi  
     continue; }~'Wz*Gm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "}+/ 0$F  
    { y/6LMAI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); F-,{+B66  
     bProcessed=TRUE; @CI6$  
    } V@'S#K#  
   } sLqvDH?V  
  } Rs[]i;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Lbp6I0&n  
   for(int index=0;index<MAX_KEY;index++){ k[)@I;m  
    if(hCallWnd[index]==NULL) E(LE*J  
     continue; V(uRKu x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !D&MJThNy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); kD7(}N8YR  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 aB!Am +g  
   } Z|S7 " ,  
  } j:KQIwc  
 } gK\7^95  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ZKPkx~,U[  
} ~RAH -]  
2I 7`  
  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: u`@FA?+E1  
NT/B4'_@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iX6jvnJ:/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k\%v;3nBK  
<uwCP4E  
  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: .LR>&N_U  
I'b]s~u  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ea>\.D-S  
{ B&N&eRAE  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) T@Z{KV"S  
 { #de^~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 0w. _}C z  
  SaveBmp(); {~I_rlo n  
  return FALSE;  " 1Aus  
 } 8mLU ~P |  
 …… //其它处理及默认处理 wT yM9wz&  
} `3oP^#  
qJt gnk|  
ZUW>{'[K  
  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。 lFY8^#@  
82!GM.b  
  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。 h18y?e7MU  
}l!_m.#e  
  二、编程步骤 0N;d)3  
i]?xM2(N  
  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"; 17MjIX  
Qo *]l_UO;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; as!j0j%  
S,RJ#.:F[t  
  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; 9W$)W  
eJp-s" %  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 9'h^59  
!OgoV22  
  5、 添加代码,编译运行程序。 [`\Qte%UH  
'FFc"lqj  
三、程序代码 :K:gyVrC  
.Kwl8xRg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ]_8 \g`"u  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3y,?>-  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 7'uc;5:  
#if _MSC_VER > 1000 !I_4GE,  
#pragma once @{lnfOESl  
#endif // _MSC_VER > 1000 _/ZY&5N  
#ifndef __AFXWIN_H__ N&`ay{&`:  
#error include 'stdafx.h' before including this file for PCH UOOme)\>  
#endif :XZ pnjj  
#include "resource.h" // main symbols :zRboqe(cc  
class CHookApp : public CWinApp hz<J8'U  
{ oH"N>@Vl  
 public: 0+pJv0u  
  CHookApp(); .9Fm>e+!C  
  // Overrides ZE` {J =,  
  // ClassWizard generated virtual function overrides c iX2G  
  //{{AFX_VIRTUAL(CHookApp) 'v  X"l  
 public: JvaaBXkS\  
  virtual BOOL InitInstance(); a"aV&t  
  virtual int ExitInstance(); l:f sZO4  
  //}}AFX_VIRTUAL ?s33x#  
  //{{AFX_MSG(CHookApp) gwNkjI= ,  
  // NOTE - the ClassWizard will add and remove member functions here. pj]<i.p  
  // DO NOT EDIT what you see in these blocks of generated code ! +(%[fW  
  //}}AFX_MSG 3: Uik  
  DECLARE_MESSAGE_MAP() Kjw\SQ)2~  
}; #KW:OFT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);  ?~IZ{!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '7s!N F2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 54w-yY  
BOOL InitHotkey(); a"0~_=  
BOOL UnInit(); Shz;)0To  
#endif m@~x*+Iz  
 U2$T}/@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. I r~X#$Upc  
#include "stdafx.h" n]Y _C^  
#include "hook.h" 1[^d8!U  
#include <windowsx.h> T 1=M6iJ  
#ifdef _DEBUG :TI1tJS~*  
#define new DEBUG_NEW *cIXae^Y7  
#undef THIS_FILE <b I,y_<K  
static char THIS_FILE[] = __FILE__; ? Q}{&J  
#endif VIzZmd  
#define MAX_KEY 100 ;zDc0qpw  
#define CTRLBIT 0x04 to7)gOX(  
#define ALTBIT 0x02 |=s3a5sl  
#define SHIFTBIT 0x01 4>*`26  
#pragma data_seg("shareddata") Vk-_H)*r  
HHOOK hHook =NULL; JB<4 m4-  
UINT nHookCount =0; Ji q[VeLe  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey .~J^`/o  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^h=kJR9  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey h6/Z_ Y  
static int KeyCount =0; Lt_]3g o  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift l1WVt}  
#pragma data_seg() 9OUhV [D  
HINSTANCE hins; S}X:LHr*  
void VerifyWindow(); 4NV1v&"  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) S# #W_OlrI  
//{{AFX_MSG_MAP(CHookApp) fF%r$`2  
// NOTE - the ClassWizard will add and remove mapping macros here. jQ*Qh  
// DO NOT EDIT what you see in these blocks of generated code! ~55>uw<  
//}}AFX_MSG_MAP 'oG'`ED"  
END_MESSAGE_MAP() e-mlvi^-  
fp0Va!T(V  
CHookApp::CHookApp() 1~ Nz6  
{ ~\P.gSiz  
 // TODO: add construction code here, 1 <+^$QL  
 // Place all significant initialization in InitInstance mLE`IKgd]  
} =xoTH3/,>  
7|rT*-Ia  
CHookApp theApp; 1o%Hn"uG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  t2iFd?  
{ nj mE>2  
 BOOL bProcessed=FALSE; 7Y/_/t~Y  
 if(HC_ACTION==nCode) qM+T Wp  
 { r DuG["  
  if((lParam&0xc0000000)==0xc0000000){// Key up k"J?-1L  
   switch(wParam) zVu}7v()  
   { OK=t)6&b  
    case VK_MENU: GF&"nW9A  
     MaskBits&=~ALTBIT; o/R-1\Dn  
     break; Wm 61  
    case VK_CONTROL: s/V[tEC*z  
     MaskBits&=~CTRLBIT; t&_lpffv  
     break; ^gG,}GTl  
    case VK_SHIFT: 3$Je,|bs  
     MaskBits&=~SHIFTBIT; Vs >1%$If  
     break; i ^#R iCeo  
    default: //judge the key and send message J$0*K+m  
     break; ?W()Do1tR  
   } GfDA5v[  
   for(int index=0;index<MAX_KEY;index++){ @ 55Y2  
    if(hCallWnd[index]==NULL) c{~*\&  
     continue; *"@P2F&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v&Kw 3!X#E  
    { eC?N>wHH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2;/hFwm  
     bProcessed=TRUE; $3>|R lxYA  
    } Go4l#6  
   } "TPMSx&Ei  
  } o%:eYl  
  else if((lParam&0xc000ffff)==1){ //Key down i|*:gH  
   switch(wParam) OR3TRa XD  
   { u|e2T@t=  
    case VK_MENU: Oaui@q  
     MaskBits|=ALTBIT; c!zu0\[Id  
     break; W8)GT`\  
    case VK_CONTROL: 8g\.1<~  
     MaskBits|=CTRLBIT; _>s.V`N'  
     break; Ab`Gb  
    case VK_SHIFT: #ed]zI9O  
     MaskBits|=SHIFTBIT; ~F WmT(S  
     break; y^ohns5{  
    default: //judge the key and send message j2+&B9 (  
     break; )jg3`I@  
   } 3jeR;N]x  
   for(int index=0;index<MAX_KEY;index++) 5@Sb[za  
   { b~r ?#2K  
    if(hCallWnd[index]==NULL) ~jgd92`{z  
     continue; V;$lgTs|'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IcB>Hg5  
    { \a<E3 <  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); AK[c!mzx  
     bProcessed=TRUE; - 0zo>[c/p  
    } D3eK!'qS  
   } ipsNiFv:  
  } /)~M cP3  
  if(!bProcessed){ bz1\EkLL  
   for(int index=0;index<MAX_KEY;index++){ @_;6 L  
    if(hCallWnd[index]==NULL) uaiG (O   
     continue; fYwumx`J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pcE.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;kY=}=9  
   } TWy1)30x  
  } fy-( B;  
 } epQ7@9,Q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); qFay]V(O|  
} X]N8'Yt  
Mf?4 `LM  
BOOL InitHotkey() -Jb I7Le  
{ >6Q-e$GS@  
 if(hHook!=NULL){ \o/oM,u  
  nHookCount++; BJqM=<nQ  
  return TRUE; hSxf;>(d  
 } 17-K~ybc  
 else mV-MJ$3r  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); xMe[/7)4  
  if(hHook!=NULL) &4DWLI  
   nHookCount++; <3i!{"}  
  return (hHook!=NULL); gX[6WB"p  
} Ox58L>:0m  
BOOL UnInit() EM"YjC)F  
{ @rE>D  
 if(nHookCount>1){ a}6Wo=  
  nHookCount--; E]bjI$j  
  return TRUE; >scEdeM  
 } ]1X];x&e  
 BOOL unhooked = UnhookWindowsHookEx(hHook); V4|pZ]  
 if(unhooked==TRUE){ \5Hfe;ny-~  
  nHookCount=0; 'Ic$p>  
  hHook=NULL; @hk~8y]rz  
 } 6b@:La  
 return unhooked; 8kk$:8  
} J:t1W=lJ3  
j &~OR6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (i {  
{ xR$xAcoSB  
 BOOL bAdded=FALSE; 1Eh (U  
 for(int index=0;index<MAX_KEY;index++){ )H)HR`  
  if(hCallWnd[index]==0){ C/)Xd^#  
   hCallWnd[index]=hWnd; 5K,Y6I&$SJ  
   HotKey[index]=cKey; W}Z'zU?[  
   HotKeyMask[index]=cMask;  0N md*r  
   bAdded=TRUE; K?) &8S  
   KeyCount++; Y}PI{PN  
   break; )8yNqnD  
  } B&cC;Hw  
 } r.[9/'>  
 return bAdded; fF ;-d2mF  
} fxjs"rD5  
%{axoGd  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) WUKYwA/t  
{ ri6_u;Ch  
 BOOL bRemoved=FALSE; {@k5e) Q  
 for(int index=0;index<MAX_KEY;index++){ K"eW.$  
  if(hCallWnd[index]==hWnd){ QD<f) JZK  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :hZYh.y\l  
    hCallWnd[index]=NULL; op;OPf,  
    HotKey[index]=0; >-f`mT  
    HotKeyMask[index]=0; '(;`t1V8k  
    bRemoved=TRUE; rlgp1>89  
    KeyCount--; -Zkl\A$>  
    break; G >bQlZG  
   } c{z QX0  
  } >a[)F  
 } +Ibcc8Qud  
 return bRemoved; 4&}LYSZl  
} G;MmD?VJ g  
H{yeN 5   
void VerifyWindow() u[})|x*N  
{ tAefBFu  
 for(int i=0;i<MAX_KEY;i++){ SZNM$X|T  
  if(hCallWnd!=NULL){ Eb[*nWF=  
   if(!IsWindow(hCallWnd)){ Tm qtj  
    hCallWnd=NULL; `|[Q]+Mx  
    HotKey=0; USv: + .  
    HotKeyMask=0; Y$shn]~  
    KeyCount--; V|)3l7IC<  
   } (i1 ]+.  
  } ,F]Y,"x:  
 } YP/BX52 v  
} 6Gwk*%sb  
h,45-#+  
BOOL CHookApp::InitInstance() o/ ozX4C  
{ 9ELLJ@oNC  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); GG-7YJ  
 hins=AfxGetInstanceHandle(); Ru `&>E  
 InitHotkey(); >:WnCkbp  
 return CWinApp::InitInstance(); ycTX\.KV  
} > X<pzD3u  
rLtB^?A z  
int CHookApp::ExitInstance() ,E<(K8  
{ l~.ae,|7  
 VerifyWindow(); zuwlVn  
 UnInit(); ( $A0b  
 return CWinApp::ExitInstance(); }KcvNK (  
}  \9N1:  
Z_Qs^e$  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file FWNWOU  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 07`hQn)Gc  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ &Ba` 3V\M  
#if _MSC_VER > 1000 f%<kcM2  
#pragma once PRg^E4  
#endif // _MSC_VER > 1000 &'Pwz  
2r4owB?  
class CCaptureDlg : public CDialog J'jwRn  
{ BIqZg$  
 // Construction TCWy^8LA  
 public: @z[,w`  
  BOOL bTray; 0Z $=2c?xT  
  BOOL bRegistered; K-vG5t0$\/  
  BOOL RegisterHotkey(); cks53/Z  
  UCHAR cKey;  rl"$6{Z}  
  UCHAR cMask; CY"&@v1  
  void DeleteIcon(); >MwjUq  
  void AddIcon(); 78T9"CS  
  UINT nCount; lV<2+Is  
  void SaveBmp(); LQ(z~M0B  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9%T~^V%T7  
  // Dialog Data }coSMTMv6  
  //{{AFX_DATA(CCaptureDlg) fyaiRn9/  
  enum { IDD = IDD_CAPTURE_DIALOG }; /%fBkA#n  
  CComboBox m_Key; <pyLWmO  
  BOOL m_bControl; {xJq F4  
  BOOL m_bAlt; v,Eqn8/O  
  BOOL m_bShift; dY[ XNP  
  CString m_Path; 2[-@ .gH  
  CString m_Number; _$g6Mj]1z  
  //}}AFX_DATA iZm# "}VG  
  // ClassWizard generated virtual function overrides 4LO4SYW7  
  //{{AFX_VIRTUAL(CCaptureDlg) YW9r'{(D(I  
 public: )lh48Ag0t;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); iYJ:P  
 protected: <?yf<G'$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dp;;20z  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); IsP-[0it  
  //}}AFX_VIRTUAL J8IdQ:4^l  
  // Implementation HmlE Cx  
 protected: =A[:]),v  
  HICON m_hIcon; ts|dk%  
  // Generated message map functions A8tzIh8  
  //{{AFX_MSG(CCaptureDlg) YD>5zV%!D  
  virtual BOOL OnInitDialog(); 3h N?l :/b  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Zcst$Aro  
  afx_msg void OnPaint();  =ie8{j2:  
  afx_msg HCURSOR OnQueryDragIcon(); Lxz!>JO>  
  virtual void OnCancel(); qTxw5.Ai!  
  afx_msg void OnAbout(); cC@.&  
  afx_msg void OnBrowse(); D#"BY; J  
  afx_msg void OnChange(); YNHQbsZUI,  
 //}}AFX_MSG dZ^(e0& :H  
 DECLARE_MESSAGE_MAP() 7uy?%5  
}; f+3ico]f@  
#endif ~hiJOaCzM  
"wwAbU<  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file q+<<Ku(20  
#include "stdafx.h" n/]w!  
#include "Capture.h" $FR1^|P/G  
#include "CaptureDlg.h" JzuU k  
#include <windowsx.h> o9GtS$ O\  
#pragma comment(lib,"hook.lib") bzj9U>eY  
#ifdef _DEBUG cl2+,!:  
#define new DEBUG_NEW TgC8EcLr  
#undef THIS_FILE 'DLgOUvh  
static char THIS_FILE[] = __FILE__; 10.u  
#endif I'sq0^  
#define IDM_SHELL WM_USER+1 *49({TD6`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {9mXJu$cc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); MC\rx=cR\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; m 0jm$> :Z  
class CAboutDlg : public CDialog ''. P=  
{ [te9ui%JS  
 public: *aem5 E`c  
  CAboutDlg(); skSs|slp  
  // Dialog Data Dqxtc|vo  
  //{{AFX_DATA(CAboutDlg) [v0[,K  
  enum { IDD = IDD_ABOUTBOX }; 6>  L)  
  //}}AFX_DATA r [NI#wW  
  // ClassWizard generated virtual function overrides Ku 'OM6D<  
  //{{AFX_VIRTUAL(CAboutDlg) Wb)>APL  
 protected: /kZ{+4M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +F>9hA  
  //}}AFX_VIRTUAL ^jph"a C  
  // Implementation rHSA5.[1P  
 protected: %1JN%  
  //{{AFX_MSG(CAboutDlg) Wnf3[fV6P  
  //}}AFX_MSG gC/~@Z8W]  
  DECLARE_MESSAGE_MAP() S2APqRg*  
}; [nYm-\M  
uGo tXb  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) C4,;l^?=%  
{ 44r@8HO1  
 //{{AFX_DATA_INIT(CAboutDlg) &<Iyb}tA?  
 //}}AFX_DATA_INIT `qXCY^BH2  
} E\$7tXQK6  
o x|K2A  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :NCY6? [Dz  
{ s8O.yL  
 CDialog::DoDataExchange(pDX); (Ci{fY6`  
 //{{AFX_DATA_MAP(CAboutDlg) !<EQVqj6  
 //}}AFX_DATA_MAP !Py SYY  
} LvM;ZfAEv  
0aWy!d  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3)ZdT{ MY  
 //{{AFX_MSG_MAP(CAboutDlg) 1K&_t  
 // No message handlers N'5AU (  
 //}}AFX_MSG_MAP @gc|Z]CV  
END_MESSAGE_MAP() G d%X> ~  
MJyz0.9c  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) {?+dVLa^;  
: CDialog(CCaptureDlg::IDD, pParent) E\_Wpk  
{ Q:v9C ^7  
 //{{AFX_DATA_INIT(CCaptureDlg) NT1"?Thx|  
  m_bControl = FALSE; isF jJPe  
  m_bAlt = FALSE; *X%dg$VcV  
  m_bShift = FALSE; bjq+x:>  
  m_Path = _T("c:\\"); \h{M\bSIEa  
  m_Number = _T("0 picture captured."); @nNhW  
  nCount=0; M9PzA'}4W6  
  bRegistered=FALSE; f+c<|"we  
  bTray=FALSE; M~!DQ1u  
 //}}AFX_DATA_INIT S7(Vc H  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {J[5 {]Je[  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0b3z(x!O  
} 7,v}Ap]Pa  
e5z U`R  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) B* hW  
{ I k[{,p  
 CDialog::DoDataExchange(pDX); RJ63"F $  
 //{{AFX_DATA_MAP(CCaptureDlg) [(81-j1v  
  DDX_Control(pDX, IDC_KEY, m_Key); .[Hv/?L  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); H)@f_pfj(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); qX_( M2oLU  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $D%[}[2  
  DDX_Text(pDX, IDC_PATH, m_Path); ,suC`)R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #P,C9OQD  
 //}}AFX_DATA_MAP +`(,1L1  
} sI,S(VWor  
;,&$ob*/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) cD5^mxd%  
//{{AFX_MSG_MAP(CCaptureDlg) |to|kU  
 ON_WM_SYSCOMMAND() I_aS C4  
 ON_WM_PAINT() gX'nFGqud  
 ON_WM_QUERYDRAGICON() \v,m r|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %=PGvu  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) f 8AgTw,K8  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4k6,pt"  
//}}AFX_MSG_MAP [BLBxSL  
END_MESSAGE_MAP() ]+)cXJ}6#  
.I1k+   
BOOL CCaptureDlg::OnInitDialog() z>&|:VGG  
{ uK!G-1   
 CDialog::OnInitDialog();  y5!fbmf  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); m|8ljXX  
 ASSERT(IDM_ABOUTBOX < 0xF000); 2y;J 11\  
 CMenu* pSysMenu = GetSystemMenu(FALSE);  9{(A-  
 if (pSysMenu != NULL) DtRu&>o_6D  
 { s0/[mAY  
  CString strAboutMenu; Wf>P[6  
  strAboutMenu.LoadString(IDS_ABOUTBOX); O\z]1`i*o  
  if (!strAboutMenu.IsEmpty()) P_y8[Y]?  
  { "4Bk  
   pSysMenu->AppendMenu(MF_SEPARATOR); Z{p)rscX  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); F?jFFw im  
  } QVq+';cG  
 } /t $J<bU  
 SetIcon(m_hIcon, TRUE); // Set big icon ch-.+p3  
 SetIcon(m_hIcon, FALSE); // Set small icon 49Y_ze6L}  
 m_Key.SetCurSel(0); 0D Q\akh  
 RegisterHotkey(); >I&'Rj&Mc  
 CMenu* pMenu=GetSystemMenu(FALSE); 3{/Y&/\"'^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); xA7Aw0  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8~6H\.0Q  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); h!4jl0 oX]  
 return TRUE; // return TRUE unless you set the focus to a control 2 g`<*u*  
} Kc,=J?Ob  
i p"LoCE  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) yr"BeTrS.  
{ wusj;v4C4M  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) QGkMT +A  
 { 65g"$:0  
  CAboutDlg dlgAbout; 7#G8qh<  
  dlgAbout.DoModal(); 8 mFy9{M  
 } EsK.g/d  
 else tpQ?E<O  
 { 9`8D Ga  
  CDialog::OnSysCommand(nID, lParam); R32A2Ml  
 } y<0RgG1qp  
} NJqjW  
!\(j[d#  
void CCaptureDlg::OnPaint() %7vjYvo>  
{ Jp#Onl+d6  
 if (IsIconic()) J6s@}@R1  
 { ZPO+ #,  
  CPaintDC dc(this); // device context for painting $eQf5)5  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ynQ+yW74Z  
  // Center icon in client rectangle -,Y[`(q  
  int cxIcon = GetSystemMetrics(SM_CXICON); $bd tiD  
  int cyIcon = GetSystemMetrics(SM_CYICON); a|5^4 J \%  
  CRect rect; >anq1Kf  
  GetClientRect(&rect); u.~`/O  
  int x = (rect.Width() - cxIcon + 1) / 2;  A&8{0  
  int y = (rect.Height() - cyIcon + 1) / 2; 4 >2g&);B  
  // Draw the icon -l2aAK1M  
  dc.DrawIcon(x, y, m_hIcon); J 6%CF2  
 } Dmq_jt  
 else "$6 .L^9W  
 { A-GU:B  
  CDialog::OnPaint(); L?:fyNA3[  
 } `rQDX<?  
} )o[Jxu'  
 gK Uci  
HCURSOR CCaptureDlg::OnQueryDragIcon() 5+yT{,(5  
{ =|Vm69  
 return (HCURSOR) m_hIcon; .`; bQh'!  
} F&[MyXU4  
"%[aWb  
void CCaptureDlg::OnCancel() N{<9N jmm  
{ I4RUXi 5  
 if(bTray) |vVcO  
  DeleteIcon(); M tD{/.D>  
  CDialog::OnCancel(); Ak=|wY{  
} >mXq= 9L4  
yG~7Xo5  
void CCaptureDlg::OnAbout() wrJ:jTh  
{ <JkmJ/X  
 CAboutDlg dlg; E2%{?o  
 dlg.DoModal(); 27CVAX ghV  
} 898=9`7e  
\'[C_+;X  
void CCaptureDlg::OnBrowse() 5<=ktA48[  
{ W%,h{  
 CString str; FsTl@zN  
 BROWSEINFO bi; 1nAAs;`'  
 char name[MAX_PATH]; 23_\UTM}1  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Dc;zgLLL  
 bi.hwndOwner=GetSafeHwnd(); 7 8n`VmH~L  
 bi.pszDisplayName=name; ^PrG5|,s  
 bi.lpszTitle="Select folder"; x |0@T?  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7!r)[2l  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); vf-cx\y7  
 if(idl==NULL) 9@{=2 k  
  return; c!20(( 2|I  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); jDKL}x  
 str.ReleaseBuffer(); # qPWJ  
 m_Path=str; V 'e _gH  
 if(str.GetAt(str.GetLength()-1)!='\\') (w/)u  
  m_Path+="\\"; s^6"qhTa  
 UpdateData(FALSE); xTV3U9 v  
} F4$N:J kl  
s;NPY  
void CCaptureDlg::SaveBmp() XkE'k;AEx  
{ 9 U!-Zn!  
 CDC dc; XaH%i~}3  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >|| =#;  
 CBitmap bm; +w(>UBy-  
 int Width=GetSystemMetrics(SM_CXSCREEN); aH(B}wh{  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~P5;k_&  
 bm.CreateCompatibleBitmap(&dc,Width,Height); aNxq_pRb  
 CDC tdc; 5uxB)Dx)  
 tdc.CreateCompatibleDC(&dc); @Q#<-/  
 CBitmap*pOld=tdc.SelectObject(&bm); ,'>,N/JA  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); WiBO8N,%`  
 tdc.SelectObject(pOld); pjaDtNb  
 BITMAP btm; )cUFb:D*"  
 bm.GetBitmap(&btm); >ngP\&\  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {S 2? }  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); KB6'sj  
 BITMAPINFOHEADER bih; o n+:{ad  
 bih.biBitCount=btm.bmBitsPixel; N{o3w.g  
 bih.biClrImportant=0; E>2~cC*  
 bih.biClrUsed=0; hnD=DLW $  
 bih.biCompression=0; cZd{K[fuK  
 bih.biHeight=btm.bmHeight; /ltGSl  
 bih.biPlanes=1; G j9WUv[P  
 bih.biSize=sizeof(BITMAPINFOHEADER); WK)2/$7@  
 bih.biSizeImage=size; ;E0aTV)Zp  
 bih.biWidth=btm.bmWidth; :3$$PdZ  
 bih.biXPelsPerMeter=0; c(5r  
 bih.biYPelsPerMeter=0; fBZAO  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <~ 9a3c?  
 static int filecount=0; nPh| rW=  
 CString name; U5!T-o;3}  
 name.Format("pict%04d.bmp",filecount++); `:&jbd4H  
 name=m_Path+name; B^yA+&3HI  
 BITMAPFILEHEADER bfh; Cg4l*"_  
 bfh.bfReserved1=bfh.bfReserved2=0; }US^GEs(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); "PhP1;A9,  
 bfh.bfSize=54+size; xfsf  
 bfh.bfOffBits=54; L28DBjE)A  
 CFile bf; 64jFbbd-/  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ O>)Fl42IeD  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); p.50BcDg  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); SuuLB6{u3  
  bf.WriteHuge(lpData,size); d> OLnG> F  
  bf.Close(); `L#`WC@[o  
  nCount++; !`$xN~_  
 } [ _N w5_  
 GlobalFreePtr(lpData); t=B>t S.hO  
 if(nCount==1) } 63Qh}_Y  
  m_Number.Format("%d picture captured.",nCount); QW[ gDc  
 else U 4Sxr  
  m_Number.Format("%d pictures captured.",nCount); b!hs|emo;  
  UpdateData(FALSE); {6,  l#z  
} ;5TQH_g  
/6@~XO) w  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) jXu)%<  
{ /CW 0N@  
 if(pMsg -> message == WM_KEYDOWN) : #om6}   
 { {@tqeu%IM  
  if(pMsg -> wParam == VK_ESCAPE) @ UgZZ  
   return TRUE; )!tqock*v  
  if(pMsg -> wParam == VK_RETURN) G+dQ" cI9  
   return TRUE; rm"C|T4:V  
 } o{n)w6P{R,  
 return CDialog::PreTranslateMessage(pMsg); Xe:gH.}  
} n +R3  
M}c gVMW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5:r*em  
{ A\IQM^i  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ EJ&aT etQ  
  SaveBmp(); <!m'xOD  
  return FALSE; E]<Ce;Vj  
} l%^VBv> 2  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 0[SJ7k19  
 CMenu pop; S.Rqu+  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); oMNgyAp^  
 CMenu*pMenu=pop.GetSubMenu(0);  +?I 1Og  
 pMenu->SetDefaultItem(ID_EXITICON); { t1|6R0  
 CPoint pt; dY6A)[dAH'  
 GetCursorPos(&pt); _${//`ia=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); S>y(3E]I  
 if(id==ID_EXITICON) #x^dR-@   
  DeleteIcon(); Cvk n2T  
 else if(id==ID_EXIT) F]L$xU  
  OnCancel(); L UitY  
 return FALSE; 9PZY](/  
} M!Hn`_E  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Eh{]so  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dYP-QUM$7  
 AddIcon(); k_$9cVA  
 return res; O wJZ?j& )  
} f5p:o}U*  
wAn}ic".b  
void CCaptureDlg::AddIcon() p(J,fus  
{ vsDR@Y}k  
 NOTIFYICONDATA data; pD )$O}  
 data.cbSize=sizeof(NOTIFYICONDATA); ESQgN+llj  
 CString tip; V_.n G;  
 tip.LoadString(IDS_ICONTIP); AR}q<k6E  
 data.hIcon=GetIcon(0); /-_<RQ  
 data.hWnd=GetSafeHwnd(); D6wg^ 'Q:  
 strcpy(data.szTip,tip); {TV6eV  
 data.uCallbackMessage=IDM_SHELL; s2'] "wM  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; F9Y/Z5 Ea  
 data.uID=98; h%0hryGB  
 Shell_NotifyIcon(NIM_ADD,&data); D6M ktE)'  
 ShowWindow(SW_HIDE); .&R j2d  
 bTray=TRUE; q)Uh_l.Cj  
} [`'[)B  
L4wKG&  
void CCaptureDlg::DeleteIcon() %?`TyVt&0  
{ QL{{GQ_dn  
 NOTIFYICONDATA data; v\;hI5WY  
 data.cbSize=sizeof(NOTIFYICONDATA); h4\j=Np  
 data.hWnd=GetSafeHwnd(); 265sNaX  
 data.uID=98; #^Io9dA h  
 Shell_NotifyIcon(NIM_DELETE,&data); L(Ffa(i  
 ShowWindow(SW_SHOW); k%[pZ 5.!  
 SetForegroundWindow(); WOgPhJ  
 ShowWindow(SW_SHOWNORMAL); 7G^`'oZ  
 bTray=FALSE; c(tX761qz  
} E@%X  
l[)ZEEP  
void CCaptureDlg::OnChange() ED>T2.:{  
{ bOKgR{i  
 RegisterHotkey(); y66V&#`,e0  
} Q:/BC= ~  
F N)vFQ#J  
BOOL CCaptureDlg::RegisterHotkey() kq m$a  
{ 5/m^9@A  
 UpdateData(); k&kx%skz  
 UCHAR mask=0; k'hJ@ 6eKS  
 UCHAR key=0; Gx.iZOOH/  
 if(m_bControl) 9sR?aW^$,/  
  mask|=4; g/2eY$6Z  
 if(m_bAlt) :Jz@`s1n  
  mask|=2; AzwG_XgM)  
 if(m_bShift) Sjogv  
  mask|=1; pP`KI'aUN  
  key=Key_Table[m_Key.GetCurSel()]; ^9g+\W  
 if(bRegistered){ .@(+.G  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @\_l%/z{  
  bRegistered=FALSE; :mpR}.^hv  
 } .^Z^L F  
 cMask=mask; .gPXW=r  
 cKey=key; v;r!rZX  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mnwYv..ePz  
 return bRegistered; LZ"yMnhOf  
} W%)uKQha  
ebuR-9  
  四、小结 N0:gY]o%  
B< `'h  
  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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