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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: ??xlA-E  
  )h"Fla  
  一、实现方法 Zw=G@4xoU  
=y;@?=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: c>MY$-PD  
7>je6*(K  
#pragma data_seg("shareddata") JLUms  
HHOOK hHook =NULL; //钩子句柄 vo;5f[>4i  
UINT nHookCount =0; //挂接的程序数目 z-Hkz  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 # cWHDRLX  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 I)[B9rbe  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Baq ~}B<  
static int KeyCount =0; zzJ^x8#R  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ]Y5dl;xrM)  
#pragma data_seg() 75Fp[Q-  
Uz>Yn&{y6  
  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。 Vu|dV\N0*  
vl~%o@*_  
  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: %F3}/2  
# ITLz!g E  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \(9p&"Q-  
cKey,UCHAR cMask) _W+Q3Jx-(  
{ S-,kI  
 BOOL bAdded=FALSE; {{zua- F  
 for(int index=0;index<MAX_KEY;index++){ A:xb!= 2  
  if(hCallWnd[index]==0){ 2mOfsn d@  
   hCallWnd[index]=hWnd; ,lP7 ri  
   HotKey[index]=cKey; 8l?w=)Qy  
   HotKeyMask[index]=cMask; %JaE4&  
   bAdded=TRUE; G;9|%yvd8  
   KeyCount++; % &+|==-  
   break; Zih5/I  
  } 'Aet{A=9  
 } VS%@)sI|Z  
 return bAdded; FLEg0/m0  
} {6YxN&  
//删除热键 -_w~JCx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Yoe les-  
{ ;$[VX/A`f  
 BOOL bRemoved=FALSE; ZK!4>OuH`  
 for(int index=0;index<MAX_KEY;index++){ m^Rd Iy)  
  if(hCallWnd[index]==hWnd){ lk~dgky@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~q5-9{ma  
    hCallWnd[index]=NULL; |'@V<^GR  
    HotKey[index]=0; 7j95"mI  
    HotKeyMask[index]=0; \hu':@}  
    bRemoved=TRUE; h bdEw=r?  
    KeyCount--; ew/KZE  
    break; zo87^y5?G  
   } ;7)OSGR  
  } "1\(ZKG8^Q  
 } 89ZDOji?O  
 return bRemoved; wo$|~ Hr  
} ul}4p{ m[  
CARq^xI-  
f};!m=b  
  DLL中的钩子函数如下: |zg=+  
rg"TJ"Q-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) e|35|I '  
{ L>i<dD{  
 BOOL bProcessed=FALSE; o<~-k,{5P  
 if(HC_ACTION==nCode) ~}Kp  
 { 55(J&q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 )|MIWgfWN  
   switch(wParam) ;}$Z 80  
   {  (xjqB{U  
    case VK_MENU: ,,zd.9n  
     MaskBits&=~ALTBIT; `\nON  
     break; f&+XPd %  
    case VK_CONTROL: 5+J 64_  
     MaskBits&=~CTRLBIT; (X0`1s  
     break; pE~9o 9  
    case VK_SHIFT: N:"M&E UM  
     MaskBits&=~SHIFTBIT; Qd 9-u)L<  
     break; EKV+?jj$  
    default: //judge the key and send message >Iu]T{QNO  
     break; aslU`#"  
   } ^uKnP>*l  
   for(int index=0;index<MAX_KEY;index++){ dcV,_  
    if(hCallWnd[index]==NULL) Xp<A@2wt?  
     continue; uEc0/ a :.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c,+L +  
    { c13vEn!c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D|u^8\'.  
     bProcessed=TRUE; tjBh$)  
    } -lJx%9>  
   } 3ybK6!g`[  
  } 7F>gj  
  else if((lParam&0xc000ffff)==1){ //有键按下 yEMX`  
   switch(wParam) o|zrD~&$  
   { > C*?17\  
    case VK_MENU: mf Wz@=0  
     MaskBits|=ALTBIT; 7,) 67G;  
     break; Nb|3?c_  
    case VK_CONTROL: <M5{.`o  
     MaskBits|=CTRLBIT; yv6Zo0s<J  
     break; z 'vdC  
    case VK_SHIFT: Wto@u4  
     MaskBits|=SHIFTBIT; &KOG[tv  
     break; lp37irI:  
    default: //judge the key and send message GFASF,+  
     break; doxdRYKL  
   } .(P@Bl]XJ  
   for(int index=0;index<MAX_KEY;index++){ '$2oSd  
    if(hCallWnd[index]==NULL) pXpLL_  
     continue; P%<aGb4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $ uz1  
    { UY}9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); PMz{8 F  
     bProcessed=TRUE; t5X G^3X@  
    } fY)4]=L  
   } MHpL$g=5_  
  } rE bx%u7Q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 h=i A;B^>  
   for(int index=0;index<MAX_KEY;index++){ ,Do$`yO+  
    if(hCallWnd[index]==NULL) (7rz:  
     continue; 6,V.j>z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) k@cZ"jYA  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); c1)BGy li  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (d5vH)+ A  
   } qJbhPY8Ak  
  } X d19GP!  
 } f2R+5`$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8vX*SrM  
} & 8:iB {n  
T ?<'=  
  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: 0%q ctZy  
D 7;~x]*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v4,syd*3|V  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x]%4M\T``  
Gg3?2h"d  
  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: $&n240(  
5wE !_ng>|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) a?U%l9F  
{ ![X.%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 8Jib|#!  
 { 56O<CgJF<  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 x=)30y3*;  
  SaveBmp(); UtGd/\:  
  return FALSE; qhn&;{{  
 } qu#@F\gX  
 …… //其它处理及默认处理 =aCIaL&9Y  
} eqUn8<<s  
?:;hTY  
e G*s1uQl  
  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。 $.3CiM }~  
NkjQyMF  
  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。 &:cTo(C'  
;hfG$ {l;  
  二、编程步骤 >{LJ#Dc6  
b$`4Nn|  
  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"; g8iB;%6  
v_1JH<GJ-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; te)g',#lT  
IpaJ<~ p  
  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; ]K0,nj*\c  
dPdHY&#`  
  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; t&Y^W <  
enD C#  
  5、 添加代码,编译运行程序。 (m =u;L"o  
:R|2z`b!  
三、程序代码 qU x7S(a  
i7w}`vs  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL .n|3A3:  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ;xkf ?|  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ $Ln2O#  
#if _MSC_VER > 1000 2QuypVC ]  
#pragma once Om?:X!l"  
#endif // _MSC_VER > 1000 MT#[ - M\  
#ifndef __AFXWIN_H__ HjF'~n  
#error include 'stdafx.h' before including this file for PCH $lG--s  
#endif { G>+.  
#include "resource.h" // main symbols #<V'gE  
class CHookApp : public CWinApp ^&w'`-ra  
{ va*>q-QCr  
 public: \?mU$,v oI  
  CHookApp(); cJE>;a  
  // Overrides /7HIL?r  
  // ClassWizard generated virtual function overrides u #QSa$P  
  //{{AFX_VIRTUAL(CHookApp) s].Cx4VQ  
 public: 6`$z*C2{  
  virtual BOOL InitInstance(); !\|@{UJk/  
  virtual int ExitInstance(); P9HPr2  
  //}}AFX_VIRTUAL '~6CGqU*  
  //{{AFX_MSG(CHookApp) 58gt*yVu  
  // NOTE - the ClassWizard will add and remove member functions here. <HX-qNA?  
  // DO NOT EDIT what you see in these blocks of generated code ! sVl:EVv  
  //}}AFX_MSG +wgUs*(W  
  DECLARE_MESSAGE_MAP() kd2'-9  
}; xx2:5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); oTa+E'q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HQ#L |LN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Vblf6qaBs  
BOOL InitHotkey(); (YH{%8 Z0  
BOOL UnInit(); {}gk4 xr  
#endif mp$II?hZ*  
#[ rFep  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. i*rv_G|(Zj  
#include "stdafx.h" K1:)J.ca_  
#include "hook.h" 8i 'jkyInT  
#include <windowsx.h> ;iI2K/ 3  
#ifdef _DEBUG :r+ 1>F$o  
#define new DEBUG_NEW H ;}ue  
#undef THIS_FILE \}&w/.T  
static char THIS_FILE[] = __FILE__; R}mWHB_h"  
#endif VTkT4C@I;Y  
#define MAX_KEY 100 `)_FO]m}jS  
#define CTRLBIT 0x04 y,eoTmaI  
#define ALTBIT 0x02 *wl_8Sis}  
#define SHIFTBIT 0x01 \nt'I;f  
#pragma data_seg("shareddata") {.'g!{SHp  
HHOOK hHook =NULL; \FX3=WW  
UINT nHookCount =0; BiAcjN:Z  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Wl"fh_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT C 5!6k1TcE  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey zT40,rk  
static int KeyCount =0; <1K: G/!  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 6q7Y`%j  
#pragma data_seg() {-Oc8XI/  
HINSTANCE hins; SQCuY<mD  
void VerifyWindow(); 4h@of'  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) PU\q.y0R  
//{{AFX_MSG_MAP(CHookApp) R5~m"bE  
// NOTE - the ClassWizard will add and remove mapping macros here. U}5KAi 9Z  
// DO NOT EDIT what you see in these blocks of generated code! M#IR=|P]  
//}}AFX_MSG_MAP ~0  t'+.  
END_MESSAGE_MAP() $ O>MV  
:~(^b;yhZ  
CHookApp::CHookApp() V3nv5/6  
{ xpo}YF'5  
 // TODO: add construction code here, !kYmrj**  
 // Place all significant initialization in InitInstance uATRZMai  
} F.w#AV  
@ uWD>(D  
CHookApp theApp; 8XE0 p7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) p#I1l2nE  
{ &Vm[5XW  
 BOOL bProcessed=FALSE; s;)tLJ!  
 if(HC_ACTION==nCode) V)@scB|>,  
 { &0blHDMj{#  
  if((lParam&0xc0000000)==0xc0000000){// Key up 9]9(o  
   switch(wParam) }gt~{9?c  
   { Fs~-exY1  
    case VK_MENU: 2Ki/K(  
     MaskBits&=~ALTBIT; mcracj[ B  
     break; !pXz-hxKT  
    case VK_CONTROL: Sy~Mh]{E  
     MaskBits&=~CTRLBIT; A`8If  
     break; \/G Y0s  
    case VK_SHIFT: n(MEG'9}  
     MaskBits&=~SHIFTBIT; y->iv%  
     break; !Hg#c!eOg  
    default: //judge the key and send message z AIC5fvu  
     break; &c !-C_L 2  
   } Plv+mb  
   for(int index=0;index<MAX_KEY;index++){ w[_Uv4M  
    if(hCallWnd[index]==NULL) .42OSV  
     continue; M>j)6?n`_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .})8gL7 V  
    { }2{#=Elh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); CSs6Vm!=  
     bProcessed=TRUE; >a K&T"  
    } $P~a   
   } AJ}Q,E  
  } T@XiG:b7  
  else if((lParam&0xc000ffff)==1){ //Key down CaMG$X&O  
   switch(wParam) !{LwX Kf  
   { `.XU|J*z,  
    case VK_MENU: b/`' ?| C  
     MaskBits|=ALTBIT; P{ o/F  
     break;  w4mL/j  
    case VK_CONTROL: vC1 `m  
     MaskBits|=CTRLBIT; ,#{aAx|]  
     break; :Vc9||k  
    case VK_SHIFT: %qhaVM$]  
     MaskBits|=SHIFTBIT; 7y&`H  
     break; wim}}^H  
    default: //judge the key and send message AmHIG_'  
     break; Yy]He nw;  
   } Qpc>5p![3  
   for(int index=0;index<MAX_KEY;index++) #kA+Yqy \)  
   {  R !HL+  
    if(hCallWnd[index]==NULL) u/:@+rTV_  
     continue; pe8MG(V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f32nO  
    { ;nbvn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); coBxZyM 1}  
     bProcessed=TRUE; b~-9u5.L1  
    } D KOdqTW  
   } E*zk?G|  
  } #+$z`C`  
  if(!bProcessed){ mb/Y  
   for(int index=0;index<MAX_KEY;index++){ 1x]G/I*  
    if(hCallWnd[index]==NULL) H4U;~)i  
     continue; ,fbO}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b1+Nm  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); JkTL+obu  
   } vhKD_}}aP  
  }  ^(y4]yZ  
 } 6xwC1V?:0t  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Z=ho7i  
} Mppb34y  
0>vm&W<?)  
BOOL InitHotkey() / wEr>[8S  
{ fE >FT9c  
 if(hHook!=NULL){ x~ I cSt  
  nHookCount++; Z|u_DaSrr|  
  return TRUE; =6>mlI>i  
 } NoI=t  
 else 4JucNGv  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); v+Hu=RZE  
  if(hHook!=NULL) 7kO 1d{u6b  
   nHookCount++; /IgTmXxxj  
  return (hHook!=NULL); 7l?-2I'c  
} '8Yx  
BOOL UnInit() Upf1*$p  
{ *}FoeDe  
 if(nHookCount>1){ ]:F]VRPT  
  nHookCount--; _uDtRoI8  
  return TRUE; p!=/a)4X  
 } cdk;HK_Ve.  
 BOOL unhooked = UnhookWindowsHookEx(hHook); v6]lH9c{,  
 if(unhooked==TRUE){ w(VH>t  
  nHookCount=0; zdtzR<X   
  hHook=NULL; } pA0mW9  
 } RP6QS)|  
 return unhooked; NVP~`sxiZ  
} z`{x1*w_  
]ko>vQ4]3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V<1dA\I"  
{ TJ#<wIiX  
 BOOL bAdded=FALSE; 5<9}{X+@o  
 for(int index=0;index<MAX_KEY;index++){ /|Zk$q.\  
  if(hCallWnd[index]==0){ HyZh27PE  
   hCallWnd[index]=hWnd; N"T+. r  
   HotKey[index]=cKey; 8g$pfHt|e  
   HotKeyMask[index]=cMask; r"^P>8  
   bAdded=TRUE; :Z,zWk1|  
   KeyCount++; /1Ndir^c  
   break; ~|riFp=J  
  } '(=krM9;  
 } -GQ`n01  
 return bAdded; fAXF_wj  
} p9fx~[_5/  
A+>+XA'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  zoA]7pG-  
{ pf[bOjtR  
 BOOL bRemoved=FALSE; 90 (JP-  
 for(int index=0;index<MAX_KEY;index++){ 8KN0z<  
  if(hCallWnd[index]==hWnd){ -:Yx1Y3 [  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ bDRl}^aO6  
    hCallWnd[index]=NULL;  9/`T]s"  
    HotKey[index]=0; r3;?]r.}7  
    HotKeyMask[index]=0; K '7M\:zy  
    bRemoved=TRUE; sZA7)Z`7  
    KeyCount--; U%_BgLwy%  
    break; 0.qnbDw_  
   } ]9F$/M#  
  } =[`B -?  
 } *7FtEk/l  
 return bRemoved; u8 Q`la  
} f }P6P>0T  
BRyrdt*_e  
void VerifyWindow() t,Ss3  
{ M*<Ee]u  
 for(int i=0;i<MAX_KEY;i++){ !E#FzY!}Pl  
  if(hCallWnd!=NULL){ }}G`yfs}r  
   if(!IsWindow(hCallWnd)){ plN:QS$  
    hCallWnd=NULL; f0S$p R  
    HotKey=0; {S,L %  
    HotKeyMask=0; e#BxlC  
    KeyCount--; n|q $=jE  
   } sQwRlx  
  } Z4KYVHD,  
 } wkc)2z   
} +6-_9qRq  
\I"n~h^_  
BOOL CHookApp::InitInstance() N.(wR  
{ RA^6c![  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); M-7^\wXTA  
 hins=AfxGetInstanceHandle(); *QH~ z2:[  
 InitHotkey(); Cs9o_Z~  
 return CWinApp::InitInstance(); {0?^$R8j  
} t[}&*2"$/  
\ ]v>#VXr_  
int CHookApp::ExitInstance() P.#@1_:gC  
{ x<d2/[(}mT  
 VerifyWindow(); cb82k[L6  
 UnInit(); 7fE U5@  
 return CWinApp::ExitInstance(); T]oVNy  
} Yc^;?n`x  
]Ub"NLYV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file f0M5^  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) H'a6] ]2  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ OJ?U."Lxm$  
#if _MSC_VER > 1000 'u}OeS"f  
#pragma once ?LSwJ @#  
#endif // _MSC_VER > 1000 9w!PA-) L  
6v?tZ&, G  
class CCaptureDlg : public CDialog 1 EL#T&  
{ @PzRHnT*  
 // Construction mlLx!5h=  
 public: =j^>sg]  
  BOOL bTray; YgV"*~  
  BOOL bRegistered; .C|dGE?,  
  BOOL RegisterHotkey(); 5Sz&j  
  UCHAR cKey; weH;,e*r  
  UCHAR cMask; dt5`UBvUg  
  void DeleteIcon(); W %<,GV  
  void AddIcon(); @Ta0v:Y  
  UINT nCount; @+>t]jyz  
  void SaveBmp(); ak_n  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor lk4U/:  
  // Dialog Data dnzZ\t>U  
  //{{AFX_DATA(CCaptureDlg) O^Y@&S RrQ  
  enum { IDD = IDD_CAPTURE_DIALOG }; lw`$(,  
  CComboBox m_Key; BD2Gv)?g  
  BOOL m_bControl; w&e q *q  
  BOOL m_bAlt; 9}T(m(WQVu  
  BOOL m_bShift; /lLG|aAe  
  CString m_Path; 0ky3rFSh1  
  CString m_Number; \2Yo*jE}  
  //}}AFX_DATA /_Fi4wZ  
  // ClassWizard generated virtual function overrides L"L a|  
  //{{AFX_VIRTUAL(CCaptureDlg) Ri/D>[  
 public: t vp kc;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); \SooIEl@  
 protected: %Vb~}sT:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J9&#);(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :DJLkMP  
  //}}AFX_VIRTUAL :gM_v?sy  
  // Implementation *5mJA -[B+  
 protected: |@rYh-5  
  HICON m_hIcon; ? @- t.N  
  // Generated message map functions U]Fnf?(  
  //{{AFX_MSG(CCaptureDlg) 7I0K= 'D7  
  virtual BOOL OnInitDialog(); _| >bOI  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); yK>s]65&  
  afx_msg void OnPaint(); NKYHJf2?x  
  afx_msg HCURSOR OnQueryDragIcon(); &4m;9<8\  
  virtual void OnCancel(); ~>u u1[ /  
  afx_msg void OnAbout(); r12e26_Ab  
  afx_msg void OnBrowse(); qf*e2" ~v  
  afx_msg void OnChange(); `L @`l  
 //}}AFX_MSG *#Iqz9X.Y3  
 DECLARE_MESSAGE_MAP() )2?A|f8  
}; \eCQL(_  
#endif pAH 9  
#{~3bgY  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file A}CpyRVCn  
#include "stdafx.h" *40Z }1ng  
#include "Capture.h"  L{u1_  
#include "CaptureDlg.h" $uUJV% EX  
#include <windowsx.h> =UV=F/Af^  
#pragma comment(lib,"hook.lib") ^ 20x\K  
#ifdef _DEBUG l)qGG$7$  
#define new DEBUG_NEW ?j$*a7[w  
#undef THIS_FILE tVHQ$jJY%  
static char THIS_FILE[] = __FILE__; u4~( 0  
#endif k(wJ6pc  
#define IDM_SHELL WM_USER+1 wb6$R};?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s/OXZ<C|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A[N>T\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^ =RSoR  
class CAboutDlg : public CDialog 6gD|QC~;  
{ N4wMAT:h  
 public: Ffr6P }I  
  CAboutDlg(); qR8 BS4q_p  
  // Dialog Data 5YgUk[J  
  //{{AFX_DATA(CAboutDlg) Kvh6D"  
  enum { IDD = IDD_ABOUTBOX }; 6N'HXL UlQ  
  //}}AFX_DATA ;aUI3n%  
  // ClassWizard generated virtual function overrides Bk8 '*O/)  
  //{{AFX_VIRTUAL(CAboutDlg) "dBCS  
 protected: UE/N-K)`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )4bZ;'B5  
  //}}AFX_VIRTUAL uT{.\qHo  
  // Implementation c$]NXKcA  
 protected: W'M\DKJ?  
  //{{AFX_MSG(CAboutDlg) ZUUfn~ORc  
  //}}AFX_MSG jY5BVTWnV  
  DECLARE_MESSAGE_MAP() *!x/ia9  
}; me/ae{  
aoS]Qp  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Jul xFjC  
{ h}$]3/5H  
 //{{AFX_DATA_INIT(CAboutDlg) a3oSSkT  
 //}}AFX_DATA_INIT 8v']>5S]#  
} c}g:vh  
_\2^s&iJh  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) &_y+hV{  
{ k0R;1lZ0n  
 CDialog::DoDataExchange(pDX); Eb=;D1)y]  
 //{{AFX_DATA_MAP(CAboutDlg) "6%vVi6  
 //}}AFX_DATA_MAP 9wC:8@`6E  
} hX@.k|Yd  
7c Gq.U  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) IWcYa.=tZ  
 //{{AFX_MSG_MAP(CAboutDlg) @OPyT  
 // No message handlers Q.[^5 8  
 //}}AFX_MSG_MAP 6'N!)b^-  
END_MESSAGE_MAP() ICgyCsZ,  
/A) v $Bv=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) A4W61f  
: CDialog(CCaptureDlg::IDD, pParent) +kTa>U<?  
{ -/ #tQ~{gs  
 //{{AFX_DATA_INIT(CCaptureDlg) 0IEFCDeCO  
  m_bControl = FALSE; ywV8s|o  
  m_bAlt = FALSE; ,/g\;#:{@]  
  m_bShift = FALSE; !S',V&Yb  
  m_Path = _T("c:\\"); v#`Wf}G  
  m_Number = _T("0 picture captured."); ;zO(bj>  
  nCount=0; <~Tlx:  
  bRegistered=FALSE; -j_J 1P0,  
  bTray=FALSE; :{tvAdMl7  
 //}}AFX_DATA_INIT B$)6X  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 UI:{*N**Z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0|:Ic,  
} <`q|6XWL  
PaFJw5f  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Wwf#PcC]  
{ 1W5\   
 CDialog::DoDataExchange(pDX); ,&HZvU&  
 //{{AFX_DATA_MAP(CCaptureDlg) r\"O8\  
  DDX_Control(pDX, IDC_KEY, m_Key); }x1mpPND  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2eu`X2IBcT  
  DDX_Check(pDX, IDC_ALT, m_bAlt); '.@R_sj   
  DDX_Check(pDX, IDC_SHIFT, m_bShift); sHrpBm&O4  
  DDX_Text(pDX, IDC_PATH, m_Path); _rqOzE)  
  DDX_Text(pDX, IDC_NUMBER, m_Number);  v|Tg %  
 //}}AFX_DATA_MAP rQ'tab.,]  
} [j0I}+@4H  
@"HR"@pX  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +2w54X%?M  
//{{AFX_MSG_MAP(CCaptureDlg) HJ5m5':a  
 ON_WM_SYSCOMMAND() WL}6YSC  
 ON_WM_PAINT() 9hT^Y,c0  
 ON_WM_QUERYDRAGICON() GD'C^\E aZ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 9kP!O_  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) xIrpGLPSh  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *<U&DOYV:  
//}}AFX_MSG_MAP h{sW$WA  
END_MESSAGE_MAP() S_:(I^  
fwAN9zs  
BOOL CCaptureDlg::OnInitDialog() =tH+e7it  
{ `z)!!y  
 CDialog::OnInitDialog(); ojVpw4y.  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "\BP+AF  
 ASSERT(IDM_ABOUTBOX < 0xF000); #fGb M!3p  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =pcj{B{qa  
 if (pSysMenu != NULL) #K! Df%,<  
 { vo`wYJ3W  
  CString strAboutMenu; @?Y^=0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 31>k3IP&  
  if (!strAboutMenu.IsEmpty()) m4Wn$Z  
  { BQS9q'u_  
   pSysMenu->AppendMenu(MF_SEPARATOR); `6mHt6"h  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); r$v?[x>+K  
  } i8B%|[ nm  
 } <YeF?$S}  
 SetIcon(m_hIcon, TRUE); // Set big icon 6eDIS|/  
 SetIcon(m_hIcon, FALSE); // Set small icon 6>=>Yj  
 m_Key.SetCurSel(0); iY|YEi8  
 RegisterHotkey(); ~#a1]w  
 CMenu* pMenu=GetSystemMenu(FALSE); f6L_u k`{  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); oLr"8R\d>t  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); INbjk;k  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); zK-hNDFL{  
 return TRUE; // return TRUE unless you set the focus to a control lIFt/  
} BRD'5 1]|  
i9!Urq-  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) B?0{=u  
{ @i{JqHU"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )%y~{j+M  
 { [BQw$8 +n_  
  CAboutDlg dlgAbout; uPF yRWK  
  dlgAbout.DoModal(); #dpt=  
 } M`C~6Mf+  
 else :Y J7J4  
 { K!D_PxV  
  CDialog::OnSysCommand(nID, lParam); ^8-~@01.`_  
 } n#^?X  
} L >Ez-  
>.O*gv/ _  
void CCaptureDlg::OnPaint() W#Hv~1  
{ #1jtprc  
 if (IsIconic()) 3dxnh,]&@  
 { %$Jq t  
  CPaintDC dc(this); // device context for painting _5U%'\5s  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); >0<KkBH  
  // Center icon in client rectangle (| 36!-(iK  
  int cxIcon = GetSystemMetrics(SM_CXICON); Hc&uE3=%sL  
  int cyIcon = GetSystemMetrics(SM_CYICON); x^#6>oOR  
  CRect rect; CDnR  
  GetClientRect(&rect); "x.6W!  
  int x = (rect.Width() - cxIcon + 1) / 2; 4gv.E 0Fo  
  int y = (rect.Height() - cyIcon + 1) / 2; tJ h3$K\  
  // Draw the icon A^4kYOe  
  dc.DrawIcon(x, y, m_hIcon); *m| t =9E  
 } ezg^5o;  
 else  $||ns@F+  
 { FD XWFJ  
  CDialog::OnPaint(); aJy>  
 } u8<&F`7j  
} 4Wi8 $  
rF8W(E_=  
HCURSOR CCaptureDlg::OnQueryDragIcon() S6Xb*6  
{  d-ag  
 return (HCURSOR) m_hIcon; ]F"(OWW  
} GCP{Z]u  
 4]DAh  
void CCaptureDlg::OnCancel() aDN6MZM  
{ {?@t/.4[W3  
 if(bTray) pBg|n=^  
  DeleteIcon(); O?nPxa<  
  CDialog::OnCancel(); KdOh'OrT9.  
} k9^+9P^L  
H-/; l54E  
void CCaptureDlg::OnAbout() dN]Zs9]  
{ S+) l[0  
 CAboutDlg dlg; 4T-,'P{?  
 dlg.DoModal(); T:K"  
} P3>..fhoW  
B\=SAi  
void CCaptureDlg::OnBrowse() !G)mjvEe  
{ [+g(  
 CString str; 8 3z'#  
 BROWSEINFO bi; ~_DF06G  
 char name[MAX_PATH]; LJRg>8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); g9yaNelDh)  
 bi.hwndOwner=GetSafeHwnd(); 1s{ISWm  
 bi.pszDisplayName=name; 2-vJv+-  
 bi.lpszTitle="Select folder"; 7ei>L]gm%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; M!eoe5  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Yw$a{5g  
 if(idl==NULL) g".d"d{  
  return; =y)p>3p}&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 1%$d D2  
 str.ReleaseBuffer(); JP{UgcaF  
 m_Path=str; ?TvQ"Y}k  
 if(str.GetAt(str.GetLength()-1)!='\\') dO>k5!ge|:  
  m_Path+="\\"; ZWf-X  
 UpdateData(FALSE); hnp`s%e,  
} rPRrx-A  
>Y7r \  
void CCaptureDlg::SaveBmp() bjPka{PBj  
{ DRH'A!r!  
 CDC dc; YS]>_  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); GE%2/z p  
 CBitmap bm; RY9+ 9i  
 int Width=GetSystemMetrics(SM_CXSCREEN); l% rx#;=u  
 int Height=GetSystemMetrics(SM_CYSCREEN); V -q%r  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :|Z$3q  
 CDC tdc; `@h:_d  
 tdc.CreateCompatibleDC(&dc); J__;.rnk  
 CBitmap*pOld=tdc.SelectObject(&bm); X Y~;)<s_  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 'Pf_5q  
 tdc.SelectObject(pOld); Nc{]zWL9  
 BITMAP btm; HbNYP/MN3  
 bm.GetBitmap(&btm); sC% b~  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; o:_^gJ+|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `'u Umyg  
 BITMAPINFOHEADER bih; . 3Gn ZR,L  
 bih.biBitCount=btm.bmBitsPixel; *Wzwbwg  
 bih.biClrImportant=0; RXBb:f  
 bih.biClrUsed=0; 'nMApPl  
 bih.biCompression=0; o>2e !7  
 bih.biHeight=btm.bmHeight; zu52 p4  
 bih.biPlanes=1; {]=v]O |,  
 bih.biSize=sizeof(BITMAPINFOHEADER); +W6Hva.  
 bih.biSizeImage=size; g]za"U|g  
 bih.biWidth=btm.bmWidth; 9ftN8Svw  
 bih.biXPelsPerMeter=0; mV<i JZh  
 bih.biYPelsPerMeter=0; x"vwWJNQ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5|{)Z]M%9  
 static int filecount=0; nB=0T`vQ  
 CString name; O7v]p  
 name.Format("pict%04d.bmp",filecount++); WE")xhV6  
 name=m_Path+name; oAY_sg+  
 BITMAPFILEHEADER bfh; ):krJ+-/y  
 bfh.bfReserved1=bfh.bfReserved2=0; NH'iR!iGo  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Kh)F yV  
 bfh.bfSize=54+size; vVAb'`ysv  
 bfh.bfOffBits=54; ?yp0$r/  
 CFile bf; fE^uF[-7?  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ s;J\Kc?"|  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); z5 Bi=~=#  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); VpSEVd:n  
  bf.WriteHuge(lpData,size); a"QU:<-v  
  bf.Close(); ;`kWpM;  
  nCount++; MHo1 lrZa+  
 } ;-Ss# &  
 GlobalFreePtr(lpData); E:FO_R(Xq  
 if(nCount==1) .jU Z  
  m_Number.Format("%d picture captured.",nCount); `@|w>8bMz{  
 else XvskB[\  
  m_Number.Format("%d pictures captured.",nCount); t^.'>RwW|  
  UpdateData(FALSE); A:eG5K}  
} NhA#bn9y?  
Tr&E4e  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &EovZ@u  
{ Sj)}qM-y#  
 if(pMsg -> message == WM_KEYDOWN) !9r:&n.\  
 { fYBH)E  
  if(pMsg -> wParam == VK_ESCAPE) 'S?;J ,/  
   return TRUE; s*Ih_Ag=:  
  if(pMsg -> wParam == VK_RETURN) ;xK_qBIP  
   return TRUE; YsP/p-  
 } Q.k :\m*h  
 return CDialog::PreTranslateMessage(pMsg); ~F w<eY  
} i[150g?K  
HM&1y ubh#  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kZVm1W1  
{ /APcL5:=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0Q~@F3N-\>  
  SaveBmp(); z856 nl  
  return FALSE; s t/n"HQ  
} 5)'P'kVi7.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3bs4mCq  
 CMenu pop; =MLf[   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); wqD5d   
 CMenu*pMenu=pop.GetSubMenu(0); +;q.Y?  
 pMenu->SetDefaultItem(ID_EXITICON); uLN[*D  
 CPoint pt; 6:?rlh  
 GetCursorPos(&pt); ? _ <[T  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); kIvvEh<L=  
 if(id==ID_EXITICON) d TGA5c  
  DeleteIcon(); ( 9$"#o  
 else if(id==ID_EXIT) +a|/l  
  OnCancel(); e*]r  
 return FALSE; {J]-<:XD  
} E'c%d[:H,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); aMK~1]Cx  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) },c,30V'  
 AddIcon(); ?znSx}t  
 return res; 1;&;5  
} ?4[H]BK  
v27Ja .tA  
void CCaptureDlg::AddIcon() $/_ qE  
{ I^3:YVR&  
 NOTIFYICONDATA data; #Hu~}zy  
 data.cbSize=sizeof(NOTIFYICONDATA); 8o-bd_  
 CString tip; :b/jNHJU  
 tip.LoadString(IDS_ICONTIP); 8Fq_i-u  
 data.hIcon=GetIcon(0); .L;@=Yg )  
 data.hWnd=GetSafeHwnd(); N[U9d}Zv  
 strcpy(data.szTip,tip); A0xC,V~z  
 data.uCallbackMessage=IDM_SHELL; H?yE3 w  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; XnUO*v^]  
 data.uID=98; 'Qn~H[$/p  
 Shell_NotifyIcon(NIM_ADD,&data); "5!BU&   
 ShowWindow(SW_HIDE); RuAlB*  
 bTray=TRUE; 0ys~2Y!eH  
} ]hTb@.  
O}Le]2'  
void CCaptureDlg::DeleteIcon() .mxTfP=9  
{ $.K?N@(W  
 NOTIFYICONDATA data; GsV4ZZ  
 data.cbSize=sizeof(NOTIFYICONDATA); ?o[L7JI  
 data.hWnd=GetSafeHwnd(); eN-au/kN  
 data.uID=98; lCb+{OB  
 Shell_NotifyIcon(NIM_DELETE,&data); tRfm+hqRZ  
 ShowWindow(SW_SHOW); KN[d!}W:  
 SetForegroundWindow(); 7#2j>G{?]v  
 ShowWindow(SW_SHOWNORMAL); (P@Y36j>N  
 bTray=FALSE; -50AX1h31:  
} |3eGz%Sd  
3/goCg  
void CCaptureDlg::OnChange() F^kwdS  
{ 'BqZOZw  
 RegisterHotkey(); &M"ouy Zo9  
} -{g~TUz  
H\G{3.T.9  
BOOL CCaptureDlg::RegisterHotkey() uV]ULm#,i  
{ `  2%6V)s  
 UpdateData(); RKkGITDk  
 UCHAR mask=0; *\XH+/]+  
 UCHAR key=0; U;^[$Aq  
 if(m_bControl) YD[H  
  mask|=4; 3h=8"lRc  
 if(m_bAlt) F@vbSFv)/  
  mask|=2; ffcLuXa  
 if(m_bShift) $k 2)8#\  
  mask|=1; 5cfA;(H  
  key=Key_Table[m_Key.GetCurSel()]; G=d(*+& B  
 if(bRegistered){ #V_GOy1-  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); x8[MP?Wz  
  bRegistered=FALSE; :Jxh2  
 } cCdX0@hY  
 cMask=mask; ;j} yB  
 cKey=key; tIZ~^*'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pR$6,Vi  
 return bRegistered; >|udWd^$3  
} ;Ss$2V'a  
Q GPw2Q  
  四、小结 J)x3\[}Ye  
!,&yyx.  
  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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