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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: XW" 0:}`J  
  Vm>EF~r  
  一、实现方法 ~IS8DW$;  
fyA-*)oHv  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: c$%*p (zY  
nGkSS_X  
#pragma data_seg("shareddata") =@?[.`  
HHOOK hHook =NULL; //钩子句柄 %&| uT  
UINT nHookCount =0; //挂接的程序数目 %kjG[C  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 !W9:)5^X  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 `+"(GaZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey y{>f^S<  
static int KeyCount =0; ?! 6Itkg  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @ 2)nhW/z6  
#pragma data_seg() %dFJ'[jDL  
?(R3%fU  
  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。 ]b!n ;{5  
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  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: %BP>,E/w  
k[;)/LfhS  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR <\u3p3"[4  
cKey,UCHAR cMask) ~<m^  
{ r~j [Qm"CJ  
 BOOL bAdded=FALSE; DylO;+  
 for(int index=0;index<MAX_KEY;index++){ C; N6",s!  
  if(hCallWnd[index]==0){ =abcLrf2G  
   hCallWnd[index]=hWnd; jk03 Hd  
   HotKey[index]=cKey; DfD >hf/  
   HotKeyMask[index]=cMask; 2!Dz9m3  
   bAdded=TRUE; E,}{iqAb  
   KeyCount++; 4JAz{aw'b  
   break; . : Wf>:  
  } j)?M  
 } uK2HtRY1  
 return bAdded; {E:`  
} gM\>{ihM'  
//删除热键 D=TS IJ@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) SG&,o =I$  
{ Og/aTR<;=  
 BOOL bRemoved=FALSE; $`E?=L`$  
 for(int index=0;index<MAX_KEY;index++){ q[,p#uJ]  
  if(hCallWnd[index]==hWnd){ &uK(. @  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6*q1%rs:w  
    hCallWnd[index]=NULL; ^{4BcM7eH  
    HotKey[index]=0; ;7QXs39S  
    HotKeyMask[index]=0; Mh.1KI[t  
    bRemoved=TRUE; 10Ik_L='  
    KeyCount--; 25$_tZP AI  
    break; G?1GkR  
   } >u&D@7~c  
  } .d]/:T -0  
 } P0,]`w  
 return bRemoved; IR6W'vA  
} @MES.g  
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  DLL中的钩子函数如下: o utJ/~9;  
?,>3uD#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) F@i >l{C  
{ 7__[=)(b2X  
 BOOL bProcessed=FALSE; YsVmU  
 if(HC_ACTION==nCode) p%I'd^}.!  
 { i6'=]f'{  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开  GfE>?mG  
   switch(wParam) d:(Ex^^  
   {  |Ns4^2  
    case VK_MENU: a)QT#.  
     MaskBits&=~ALTBIT; .h-mFcjy  
     break; d m8t ~38  
    case VK_CONTROL: ^l!SIu  
     MaskBits&=~CTRLBIT;   3%kUj  
     break; "GO!^ZG]  
    case VK_SHIFT: eU1F7LS  
     MaskBits&=~SHIFTBIT; mqZH<.mn  
     break; hCcI]#S&  
    default: //judge the key and send message /iU<\+ H  
     break; TTz=*t+D  
   } >GGM76vB=,  
   for(int index=0;index<MAX_KEY;index++){ !p&<.H_  
    if(hCallWnd[index]==NULL) `Nx@MPo  
     continue; Z7a@$n3h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >^s2$@J?p  
    { _QL|pLf-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u}@N Qeg  
     bProcessed=TRUE; ba|xf@=&  
    } K81X32Lm'  
   } d`^3fr'.4A  
  } J:@gmo`M;V  
  else if((lParam&0xc000ffff)==1){ //有键按下 )D+BvJ Y"  
   switch(wParam) $ZM'dIk?  
   { {N4 'g_  
    case VK_MENU: 4z0gyCAC A  
     MaskBits|=ALTBIT; .l1x~(  
     break; ?+t;\  
    case VK_CONTROL: ys9:";X;}  
     MaskBits|=CTRLBIT; >dl5^  
     break; 4YfM.~ 6  
    case VK_SHIFT: T+Z[&|  
     MaskBits|=SHIFTBIT; J4T"O<i$58  
     break; >3!~U.AA'x  
    default: //judge the key and send message o[ZjXLJzV  
     break; ,HZ%q]*:~  
   } |?T=4~b  
   for(int index=0;index<MAX_KEY;index++){ rl|'.~mc  
    if(hCallWnd[index]==NULL) >v+1 v  
     continue; ip-X r|Bq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |a{; <a  
    { COh#/-`\1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); q\EYsN</;  
     bProcessed=TRUE; !mlfG "FE  
    } jY=y<R_oK  
   } J&A1]T4d  
  } Ib..X&N2  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ZmsYRk~@-  
   for(int index=0;index<MAX_KEY;index++){ 1Wpu  
    if(hCallWnd[index]==NULL) vB7Gx>BQd  
     continue; \zBi-GI7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZNBowZI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ` UsJaoR#f  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 I3Vu/&8f|  
   } %1i:*~g  
  } ojM'8z 0Hn  
 } 'nTlCYT  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); vi##E0,N'^  
} tWIOy6`  
hEZvi   
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: *K/K97  
5iA>Z!sP[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I$; `^z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l U/Xi  
Y#F.{ i  
  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: ;M~,S^U  
Y_%:%J  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 05wkUo:9  
{ v@\S$qU2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;J W ]b]  
 { Hu|Tj<S  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 vb>F)X?b_  
  SaveBmp(); AU9C#;JD  
  return FALSE; JvAXLT  
 } oMbd1uus  
 …… //其它处理及默认处理 :s *  
} #/YS  
kLgkUck8]  
T?1BcY  
  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。 aO1^>hy  
=Y2 Rht  
  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。 4/(#masIL  
K#OL/2^ 5  
  二、编程步骤 FyEKqYl  
Yi Zk|K_  
  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"; i@rtt M  
[%K6-\S  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ^% f8JoB  
SJiQg-+<Uf  
  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; mF 1f(  
?Bu*%+  
  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; B:"D)/\  
HYdM1s6vo  
  5、 添加代码,编译运行程序。 /9_%NR[  
38w^=" -T  
三、程序代码 n-9xfn0U~#  
B#g~c<4<  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL }TTghE!  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) T,!EL +o4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ l= {Y[T&  
#if _MSC_VER > 1000 EDnNS  
#pragma once z6`0Uv~  
#endif // _MSC_VER > 1000 -E}X`?WhD  
#ifndef __AFXWIN_H__  /b=C  
#error include 'stdafx.h' before including this file for PCH ;^N lq3N  
#endif f-M:ap(O  
#include "resource.h" // main symbols $OZ= L  
class CHookApp : public CWinApp gAqK/9;  
{ 63E6nW M  
 public: $#rkvG_w  
  CHookApp(); qm=U<'b^  
  // Overrides h3`}{ w  
  // ClassWizard generated virtual function overrides ,>B11Z}PH  
  //{{AFX_VIRTUAL(CHookApp) Z )c\B  
 public: |^1g*f y?  
  virtual BOOL InitInstance(); p$,G`'l  
  virtual int ExitInstance(); {~9zuNi  
  //}}AFX_VIRTUAL WaB0?jI  
  //{{AFX_MSG(CHookApp) HO<|EH~lu  
  // NOTE - the ClassWizard will add and remove member functions here. LuySa2 ,  
  // DO NOT EDIT what you see in these blocks of generated code ! s)WA9PiC  
  //}}AFX_MSG uB)q1QQsqp  
  DECLARE_MESSAGE_MAP() O|t>.<T?  
}; \ ITd\)F%N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Cf(WO-F^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I0x)d`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); AUD) =a>  
BOOL InitHotkey(); g|Lbe4?  
BOOL UnInit(); "s|P,*Xf  
#endif [)V~U?  
OJu>#   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~HIj+kN  
#include "stdafx.h" 9\EW~OgTu  
#include "hook.h" tMw65Xei6b  
#include <windowsx.h> iZG-ca  
#ifdef _DEBUG !L.R"8!  
#define new DEBUG_NEW |tAkv  
#undef THIS_FILE kTH"" h{  
static char THIS_FILE[] = __FILE__; ;U3:1hn  
#endif vD8pVR+  
#define MAX_KEY 100 zg ,=A?  
#define CTRLBIT 0x04 }W^@mi  
#define ALTBIT 0x02 ?1L<VL=b  
#define SHIFTBIT 0x01 rCF=m]1zxT  
#pragma data_seg("shareddata")  D_dv8  
HHOOK hHook =NULL; fNLO%\G~2  
UINT nHookCount =0; GeJ}myD O  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ZV--d'YiEm  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT QqQhQGV  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey >c_fUX={  
static int KeyCount =0; Stw g[K0<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift x_~_/&X5  
#pragma data_seg() Ug+ K:YUq  
HINSTANCE hins; f+9WGNpw  
void VerifyWindow(); xS UpVK  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) f_)#  
//{{AFX_MSG_MAP(CHookApp) EPJ>@A>;D  
// NOTE - the ClassWizard will add and remove mapping macros here. Ub\^3f  
// DO NOT EDIT what you see in these blocks of generated code! 6/ 5c|  
//}}AFX_MSG_MAP ?;o0~][!  
END_MESSAGE_MAP() 0 7Yak<+~  
z00X ?F  
CHookApp::CHookApp() yf&_l^!  
{ SZXSVz0j  
 // TODO: add construction code here, v@]SddP,?  
 // Place all significant initialization in InitInstance |Ogh-<|<  
} 6fw7\u  
h[u@UGK%  
CHookApp theApp; Aa_@&e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4AzDWK@/  
{ "Bwz Fh  
 BOOL bProcessed=FALSE; tf6-DmMH  
 if(HC_ACTION==nCode) s<LnUF1b  
 { DTH}=r-  
  if((lParam&0xc0000000)==0xc0000000){// Key up O [= L#wi  
   switch(wParam) W0MgY%Qv[  
   { lv?`+tU2_  
    case VK_MENU: @?e~l:g})g  
     MaskBits&=~ALTBIT; y0Gblza  
     break; c$,1j%[)  
    case VK_CONTROL: A{4,ih"5  
     MaskBits&=~CTRLBIT; 4 .c1  
     break; Q3%]  
    case VK_SHIFT: OIj.K@Kr  
     MaskBits&=~SHIFTBIT; @p~scE.#\  
     break; :l"B NT[/  
    default: //judge the key and send message x-c5iahp'  
     break; LU;zpXg\  
   } qpFxl  
   for(int index=0;index<MAX_KEY;index++){ HI{q#  
    if(hCallWnd[index]==NULL) ;Q,t65+Am  
     continue; 9]Ue%%vM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =r/8~~=  
    { 2~\SUGW-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); LZ_0=Xx%  
     bProcessed=TRUE; i`e[Vwe2x@  
    } baD063P;  
   } 1OExa<Zq  
  } N$e mS  
  else if((lParam&0xc000ffff)==1){ //Key down &xB*Shp,B  
   switch(wParam) d)V8FX,t  
   { [uGsF0#e  
    case VK_MENU: .]h/M,xg  
     MaskBits|=ALTBIT; #<==7X#  
     break; O >+=cg  
    case VK_CONTROL: .xwskzJ3  
     MaskBits|=CTRLBIT; riOaqV  
     break; ;8XRs?xyd  
    case VK_SHIFT: 'u x!:b"  
     MaskBits|=SHIFTBIT; `1P|<VbZ  
     break; $%cHplQz5  
    default: //judge the key and send message i,^3aZwJ'  
     break;  s&pnB  
   } $adZ|Q\  
   for(int index=0;index<MAX_KEY;index++) UL}wGWaoG  
   { { rLgyrj$  
    if(hCallWnd[index]==NULL) !@ ]IJ"\  
     continue; &kzysv-_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8Yk*$RR9  
    { 17?YN<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iii|;v ]+  
     bProcessed=TRUE; 3 e'6A^#  
    } Q;VuoHj!  
   } 2<B'PR-??y  
  } v.<mrI#?  
  if(!bProcessed){ Ws|`E `6O  
   for(int index=0;index<MAX_KEY;index++){ 6Jq[]l"v  
    if(hCallWnd[index]==NULL) Wgh@XB  
     continue; _rB,N#{2R=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -->0e{y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); H}kSXKO8!8  
   } MuOKauYa  
  } 3%?tUt  
 } }~+,x#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); tgG*k$8z  
} m=l'9j"D  
M\4` S&  
BOOL InitHotkey() K [DpH&  
{ t?G6|3  
 if(hHook!=NULL){ 0c`zg7|  
  nHookCount++; $4xSI"+M%  
  return TRUE; y& yf&p  
 } jG7PT66>;  
 else S j~SG  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); v5'`iO0o  
  if(hHook!=NULL) G*+^b'7  
   nHookCount++; mTI`^e  
  return (hHook!=NULL); o5a=>|?p>  
} 7xeqs q  
BOOL UnInit() YS^!'IyG/B  
{ @T\n@M]  
 if(nHookCount>1){ _Z[0:4  
  nHookCount--; V2}\]x'1  
  return TRUE; PhC3F4  
 } :CE4< {V  
 BOOL unhooked = UnhookWindowsHookEx(hHook); =XR6rR8  
 if(unhooked==TRUE){ \wA:58 -j  
  nHookCount=0; Cty#|6 k  
  hHook=NULL; ` 'Qb?F6  
 } -:ucp2  
 return unhooked; $!>.h*np  
} P!|Z%H  
.c-a$39  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &$/ #"lW,V  
{ d)vP9vXy  
 BOOL bAdded=FALSE; K#Ck,Y"  
 for(int index=0;index<MAX_KEY;index++){ HCN/|z1Xq  
  if(hCallWnd[index]==0){ *z VN6wG{  
   hCallWnd[index]=hWnd; Ll|_Wd.K,  
   HotKey[index]=cKey; `?Q p>t  
   HotKeyMask[index]=cMask; (|^m9v0:  
   bAdded=TRUE; b&F9<XLqq  
   KeyCount++; CfU|]<  
   break; 0mSP  
  } Gf\h7)T\  
 } A! bG2{r  
 return bAdded; p5#x7*xR6  
} 0h@FHw2d  
*[]E 5U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X-HE9PT.  
{ k B>F(^  
 BOOL bRemoved=FALSE; AChz}N$C  
 for(int index=0;index<MAX_KEY;index++){ |2q3spd  
  if(hCallWnd[index]==hWnd){ A0)^I:&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ f zo'9  
    hCallWnd[index]=NULL; g.Xk6"kO  
    HotKey[index]=0; jCJcVO>OZ  
    HotKeyMask[index]=0; DRQx5fgL  
    bRemoved=TRUE; J |q(HpB  
    KeyCount--; #; ?3k uq(  
    break; xrkl)7;  
   } B}d&tH2^s  
  } }'x;J   
 } GkJcd;  
 return bRemoved; 3^y(@XFt  
} z l r !   
l\s!A&L  
void VerifyWindow() pIlEoG=[_  
{ a<G&}|6  
 for(int i=0;i<MAX_KEY;i++){ <:&vAX L  
  if(hCallWnd!=NULL){ 2cYBm^o|x  
   if(!IsWindow(hCallWnd)){ GF ux?8A:%  
    hCallWnd=NULL; |HK:\)L%  
    HotKey=0; ZUQ _u  
    HotKeyMask=0; >Wr%usNxc  
    KeyCount--; d<a|dwAeh  
   } 5Ml=<^  
  } HK!ecQ^+  
 } 6$r\p2pi0  
} )]1hN;Nz  
6CBk=)qH  
BOOL CHookApp::InitInstance() dDPQDIx  
{ _B^zm-}8|B  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); s/D)X=P1  
 hins=AfxGetInstanceHandle(); .hat!Tt9  
 InitHotkey(); "@UQSf,  
 return CWinApp::InitInstance(); vamZKm~p  
} ~gfR1SE  
>c,s}HJ  
int CHookApp::ExitInstance() 'Z`7/I4&  
{ eQbHf  
 VerifyWindow(); A8Ju+  
 UnInit(); A0DGDr PD  
 return CWinApp::ExitInstance(); 7QsD"rL  
} @gI1:-chB  
NHGTV$T`1  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \]9)%3I  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) q\0/6tl_  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ WUYI1Ij;  
#if _MSC_VER > 1000 5}#wp4U  
#pragma once ,S-h~x  
#endif // _MSC_VER > 1000 w"^h<]b  
9"P|Csj  
class CCaptureDlg : public CDialog bx3Q$|M?  
{ <gp?}Lk  
 // Construction 8 t5kou]h  
 public: 11=$] K>  
  BOOL bTray; 'X?xn@?  
  BOOL bRegistered; jo`ZuN{  
  BOOL RegisterHotkey(); _VrY7Mz:r  
  UCHAR cKey; PXb$]HV  
  UCHAR cMask; iEvQ4S6tD  
  void DeleteIcon(); n<ZPWlJ  
  void AddIcon(); ,>  zEG  
  UINT nCount; ||Zup\QB  
  void SaveBmp(); 9@ tp#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor @tH9$J*Y<  
  // Dialog Data =hPXLCeC  
  //{{AFX_DATA(CCaptureDlg) 0xB2  
  enum { IDD = IDD_CAPTURE_DIALOG }; Qz~uD'Rs/  
  CComboBox m_Key; isZ5s\  
  BOOL m_bControl; "D(Lp*3hj&  
  BOOL m_bAlt; `R[Hxi  
  BOOL m_bShift; TekUY m!G  
  CString m_Path; |mb2<!ag{  
  CString m_Number; 7j]v_2S`  
  //}}AFX_DATA ~e{ @5.g  
  // ClassWizard generated virtual function overrides 1 R5 pf  
  //{{AFX_VIRTUAL(CCaptureDlg) ZwmucY%3  
 public: -#|D>  
  virtual BOOL PreTranslateMessage(MSG* pMsg); q A)O kR'm  
 protected: cr1x CPJj  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *T5;d h (  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); P$)g=/td1  
  //}}AFX_VIRTUAL }s}g}t8v-  
  // Implementation <)VgGjZ-H  
 protected: !U^{`V jp[  
  HICON m_hIcon; +hxG!o?O  
  // Generated message map functions ZitM<Qi&y  
  //{{AFX_MSG(CCaptureDlg) /DYyl/  
  virtual BOOL OnInitDialog(); X]0>0=^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @+u>rS|IB  
  afx_msg void OnPaint(); d ]P~  
  afx_msg HCURSOR OnQueryDragIcon(); &k }f"TX2  
  virtual void OnCancel(); "s+4!,k  
  afx_msg void OnAbout(); r"7n2   
  afx_msg void OnBrowse(); 4DA34m(  
  afx_msg void OnChange(); ~^m Uu`@r  
 //}}AFX_MSG [{x}# oRSE  
 DECLARE_MESSAGE_MAP() xnP!P2  
}; V>{< pS  
#endif t[^$F,  
~3&{`9Y  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file *3GV9'-P  
#include "stdafx.h" (f#(B2j  
#include "Capture.h" =*mT{q@  
#include "CaptureDlg.h" ~ Z\:Nx  
#include <windowsx.h> U ZM #O  
#pragma comment(lib,"hook.lib") j|eA*UE  
#ifdef _DEBUG K+B978XD  
#define new DEBUG_NEW %Sr+D{B  
#undef THIS_FILE 7},A. q  
static char THIS_FILE[] = __FILE__; =CX1jrLZ  
#endif ^kez]>   
#define IDM_SHELL WM_USER+1 rd%%NnT"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *IG$"nu  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'Uok<;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; mB?x_6#d9  
class CAboutDlg : public CDialog .fA*WQ!lb  
{ %oZ:Awx  
 public: J$dwy$n  
  CAboutDlg(); D Ez,u^   
  // Dialog Data 25^?|9o7  
  //{{AFX_DATA(CAboutDlg) bF'rK'',  
  enum { IDD = IDD_ABOUTBOX }; -fR :W{u  
  //}}AFX_DATA }lJ;|kx$  
  // ClassWizard generated virtual function overrides hp\&g2_S0W  
  //{{AFX_VIRTUAL(CAboutDlg) NxT"A)u  
 protected: [|}IS@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C* 7/iRe  
  //}}AFX_VIRTUAL {z#2gc'Q  
  // Implementation WjV15\,  
 protected: MmuT~d/  
  //{{AFX_MSG(CAboutDlg) )Fw/Cu  
  //}}AFX_MSG _X6'u J  
  DECLARE_MESSAGE_MAP() &p0e)o~Ux  
}; K =g</@L6R  
t}EM X9SQ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) qe~x?FO_>  
{ wp[Ug2;G  
 //{{AFX_DATA_INIT(CAboutDlg) $pGT1oF[E  
 //}}AFX_DATA_INIT f:T?oR>2  
} % RSZ.  
KyvZ? R  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Tkbao D  
{ I[ \~ pi,  
 CDialog::DoDataExchange(pDX); UM}u(;oo%)  
 //{{AFX_DATA_MAP(CAboutDlg) APQq F/  
 //}}AFX_DATA_MAP =OVDJ0ozZ  
} G#M)5'Q]U  
g?C;b>4  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) bF)G+IH  
 //{{AFX_MSG_MAP(CAboutDlg) !3ggQG!e  
 // No message handlers d[ N1zQW  
 //}}AFX_MSG_MAP ~%TWF+  
END_MESSAGE_MAP() gEA SYIQ  
\bA Yic  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Z:; }  
: CDialog(CCaptureDlg::IDD, pParent) 9>""xt  
{ 6_LeP9s )  
 //{{AFX_DATA_INIT(CCaptureDlg) bS.w<V Ew  
  m_bControl = FALSE; DSGcxM+  
  m_bAlt = FALSE; )G? qX.D  
  m_bShift = FALSE; ^)VwxH:s  
  m_Path = _T("c:\\"); :|7#D,2  
  m_Number = _T("0 picture captured."); '`];=QY9pg  
  nCount=0; &4#Zi.]  
  bRegistered=FALSE; d|`Ll  
  bTray=FALSE; 2h E(h  
 //}}AFX_DATA_INIT Ia&R/I  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Uv^\[   
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &hCbXs=  
} +2tQ FV;  
==[,;g x  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,S)r%[ru^  
{ L74Mz]v  
 CDialog::DoDataExchange(pDX); _GOSqu!3Y  
 //{{AFX_DATA_MAP(CCaptureDlg) J 3!~e+wn  
  DDX_Control(pDX, IDC_KEY, m_Key); IG-\&  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); N^^0j,  
  DDX_Check(pDX, IDC_ALT, m_bAlt); :5d>^6eoB?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); S{Y zHK  
  DDX_Text(pDX, IDC_PATH, m_Path); BHXi g~d  
  DDX_Text(pDX, IDC_NUMBER, m_Number); OWd'z1Yl  
 //}}AFX_DATA_MAP GkIE;7#2kX  
} *bkb-n Kw  
!>UlvT-  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {Gxe%gu6K  
//{{AFX_MSG_MAP(CCaptureDlg) 7  ,Rg~L  
 ON_WM_SYSCOMMAND() :Pud%}'  
 ON_WM_PAINT() )?n'ZhsX  
 ON_WM_QUERYDRAGICON() "Fz.# U  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) "gM^o  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >rnVT K  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Z$oy;j99y  
//}}AFX_MSG_MAP h}bfZL  
END_MESSAGE_MAP() E?m~DYnU  
"LyD  
BOOL CCaptureDlg::OnInitDialog()  cby#  
{ i`,FXF)  
 CDialog::OnInitDialog(); "S#F I  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ^?z%f_ri  
 ASSERT(IDM_ABOUTBOX < 0xF000); 8hRcB[F~S  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 1MelHW  
 if (pSysMenu != NULL) v=`yfCX-qX  
 { x2"iZzQlD  
  CString strAboutMenu; LQ0/oYmNc  
  strAboutMenu.LoadString(IDS_ABOUTBOX); yNu_>!Cp5  
  if (!strAboutMenu.IsEmpty()) {.Tx70kn  
  { ^l &lwSRVt  
   pSysMenu->AppendMenu(MF_SEPARATOR); 6( HF)z  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); UD I{4+z  
  } n:j'0WW  
 } %>_[b,  
 SetIcon(m_hIcon, TRUE); // Set big icon GAGS-G#  
 SetIcon(m_hIcon, FALSE); // Set small icon )U^=`* 7  
 m_Key.SetCurSel(0); :qYp%Ub  
 RegisterHotkey(); ~zp8%lEe  
 CMenu* pMenu=GetSystemMenu(FALSE); "TRS(d|3  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); E&[5b4D@<  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7]{g^g.9-  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9+.wj/75  
 return TRUE; // return TRUE unless you set the focus to a control D0. )%  
} %E?Srs}j  
Vns3859$8  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~^t@TMk$  
{ H DVimoOq  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) bMH~vR  
 { {@Wv@H+4  
  CAboutDlg dlgAbout; %idBR7?`g  
  dlgAbout.DoModal(); 7Q 3!= b  
 } 5=>1>HYM  
 else 9>}&dQ8  
 { '3.\+^3  
  CDialog::OnSysCommand(nID, lParam); $:ush"=f8^  
 } nD wh  
} "CJVtO  
j50vPV8m  
void CCaptureDlg::OnPaint() Ik G&  
{ 5'%I4@Qn+  
 if (IsIconic()) K`*GZ+b|`  
 { ^@fD{]I  
  CPaintDC dc(this); // device context for painting ,0l Od<  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); H R>Y?B{  
  // Center icon in client rectangle p8Vqy-:  
  int cxIcon = GetSystemMetrics(SM_CXICON); OvfluFu7  
  int cyIcon = GetSystemMetrics(SM_CYICON); F!z0N&#  
  CRect rect; .ZXoRT  
  GetClientRect(&rect); }\4yU=JP K  
  int x = (rect.Width() - cxIcon + 1) / 2; *X5)9dq  
  int y = (rect.Height() - cyIcon + 1) / 2; Pz4#>tP  
  // Draw the icon "k zKQ~  
  dc.DrawIcon(x, y, m_hIcon); *D5 xbkH=.  
 } blc?[ [,!  
 else ;Iu _*U9)  
 { Met?G0[  
  CDialog::OnPaint(); {gMe<y  
 } dwj?;  
} |k a _Zy  
TykT(=  
HCURSOR CCaptureDlg::OnQueryDragIcon() &AiAd6  
{ ]uXJjS f  
 return (HCURSOR) m_hIcon; 0B6!$) *-i  
} ZR>BK,  
V"Q\7,_k.  
void CCaptureDlg::OnCancel() LF|0lAr  
{ ^:9a1{L[  
 if(bTray) r" H::A  
  DeleteIcon(); Ds1h18  
  CDialog::OnCancel(); *P mZqe  
} fRp]  
\"P{8<h.3  
void CCaptureDlg::OnAbout() [6GYYu\  
{ >hunV'vu'  
 CAboutDlg dlg; 1M ?BSH{  
 dlg.DoModal(); -cqE^qAdX  
} mc{z  
!Ko2yn}6l  
void CCaptureDlg::OnBrowse() x}G:n[B7_V  
{ Hv6h7-  
 CString str; r@G*Fx8Z  
 BROWSEINFO bi; 8ud12^s$  
 char name[MAX_PATH]; ?sfqg gi  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); O&!R7T  
 bi.hwndOwner=GetSafeHwnd(); &raqrY|V  
 bi.pszDisplayName=name; ?m7:@GOE1  
 bi.lpszTitle="Select folder"; l 9K`+c+t  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ZL|aB886  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); wMS%/l0p1  
 if(idl==NULL) ]n^iG7aB?  
  return; 5es t  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); W"\~O"a  
 str.ReleaseBuffer(); IjI'Hx  
 m_Path=str; !do`OEQKR  
 if(str.GetAt(str.GetLength()-1)!='\\') KEAXDF&#  
  m_Path+="\\"; dx%z9[8~{.  
 UpdateData(FALSE); <q63?Ms'  
} \gA!)q.;  
~^wSwd[  
void CCaptureDlg::SaveBmp() :s aP :&  
{ ]b- 2:M  
 CDC dc; 3Z*r#d$nh:  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); SYJO3cY  
 CBitmap bm; -()WTdIy  
 int Width=GetSystemMetrics(SM_CXSCREEN); c~0kZA6  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~aC ?M&  
 bm.CreateCompatibleBitmap(&dc,Width,Height); W(q3m;n  
 CDC tdc; '-wmY?ZFxy  
 tdc.CreateCompatibleDC(&dc); pcMzLMG<  
 CBitmap*pOld=tdc.SelectObject(&bm); !GOaBs  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 91OxUVd  
 tdc.SelectObject(pOld); 2z>-H595az  
 BITMAP btm; ;"dX]":  
 bm.GetBitmap(&btm); }*fBHzNN  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; '9\cIni0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); v9(5H Y  
 BITMAPINFOHEADER bih; Ejug2q  
 bih.biBitCount=btm.bmBitsPixel; =\Q< TY  
 bih.biClrImportant=0; *-0s ` rC  
 bih.biClrUsed=0; }`R,C~-|^  
 bih.biCompression=0; uq5?t  
 bih.biHeight=btm.bmHeight; 4`O[U#?  
 bih.biPlanes=1; w>W#cTt  
 bih.biSize=sizeof(BITMAPINFOHEADER); 20Zxv!  
 bih.biSizeImage=size; <AgB"y@  
 bih.biWidth=btm.bmWidth; M}] *j  
 bih.biXPelsPerMeter=0; Ow 0>qzTg  
 bih.biYPelsPerMeter=0; SxF'2ii  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); aH }/+Hu-  
 static int filecount=0; $6Ma{rC|  
 CString name; qbyYNlXqm  
 name.Format("pict%04d.bmp",filecount++); \'|n.1Fr  
 name=m_Path+name; p)biOG  
 BITMAPFILEHEADER bfh; {-A|f  
 bfh.bfReserved1=bfh.bfReserved2=0; $dM_uSt  
 bfh.bfType=((WORD)('M'<< 8)|'B'); i{$-[*WHiV  
 bfh.bfSize=54+size; [f+wP|NKL  
 bfh.bfOffBits=54; K0w}l" )A  
 CFile bf; =O}I{dNKZV  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^0]0ss;##R  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `gSMb UgF  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Es>' N3A z  
  bf.WriteHuge(lpData,size); 6 Bq_<3P_  
  bf.Close(); 5CK+\MK  
  nCount++; A f'&, 1=q  
 } ~5 6&!4  
 GlobalFreePtr(lpData); SZGR9/* ^  
 if(nCount==1) BX_yC=S  
  m_Number.Format("%d picture captured.",nCount); ns~]a:1yh  
 else ?%3dgQB'  
  m_Number.Format("%d pictures captured.",nCount); ; Z:[LJd  
  UpdateData(FALSE); 8Lgt  
} fcq8aW/z_  
HK )m^!=  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) I\*6 >  
{ %ap(=^|5  
 if(pMsg -> message == WM_KEYDOWN) SkuR~!  
 { b<FE   
  if(pMsg -> wParam == VK_ESCAPE) 4,y7a=qf3  
   return TRUE; f*%kHfaXgN  
  if(pMsg -> wParam == VK_RETURN) Fz#@[1,  
   return TRUE; >zJHvb)b\  
 } OIK x:&uIk  
 return CDialog::PreTranslateMessage(pMsg); .\_):j*  
} IiE6i43  
T)P)B6q   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Gz&}OO  
{ O)jD2X?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 1 Uup.(  
  SaveBmp(); *}2L4]  
  return FALSE; X]y:uD{  
} ;JxL>K(  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "_/ih1z]  
 CMenu pop; HH*y$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); fd[N]I3  
 CMenu*pMenu=pop.GetSubMenu(0); )tG. 9"<  
 pMenu->SetDefaultItem(ID_EXITICON); Q`F1t  
 CPoint pt; k;\gYb%L  
 GetCursorPos(&pt); *)K\&h<{  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1L,L/sOwB&  
 if(id==ID_EXITICON) q|*^{(tWs  
  DeleteIcon(); 3(e_2v  
 else if(id==ID_EXIT) 3\W/VBJJ  
  OnCancel(); n])#<0  
 return FALSE; <vcU5 .K.  
} xn*$Ty+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); y#Dh)~|k  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) pGD@R=8  
 AddIcon(); xMr,\r'+  
 return res; JQ?`l)4  
} qyM/p.mP  
J>(X0@eWz  
void CCaptureDlg::AddIcon() TuQGF$n@  
{ xM%4/QE+  
 NOTIFYICONDATA data; tp`1S+'~j  
 data.cbSize=sizeof(NOTIFYICONDATA); ??F* Z" x  
 CString tip; #*bmwb*i  
 tip.LoadString(IDS_ICONTIP); y#'hOSR2  
 data.hIcon=GetIcon(0); )$]lf }  
 data.hWnd=GetSafeHwnd(); 4r(0+SO  
 strcpy(data.szTip,tip); o 2 ng  
 data.uCallbackMessage=IDM_SHELL; vM/*S 6[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Z3]I^i FI  
 data.uID=98; 9gg{i6  
 Shell_NotifyIcon(NIM_ADD,&data); m!7%5=Fc  
 ShowWindow(SW_HIDE); \Kf\%Q  
 bTray=TRUE; ^+x?@$rq  
} ^fsMfB  
* zp tbZ  
void CCaptureDlg::DeleteIcon() d-b04Q7DQ  
{ K/W=r  
 NOTIFYICONDATA data; uHU@j(&c  
 data.cbSize=sizeof(NOTIFYICONDATA); s|p I`  
 data.hWnd=GetSafeHwnd(); sZrVANyqb  
 data.uID=98; gGM fy]]R  
 Shell_NotifyIcon(NIM_DELETE,&data); 6+$2rS$1V  
 ShowWindow(SW_SHOW); [v~,|N>w  
 SetForegroundWindow(); coAXYn  
 ShowWindow(SW_SHOWNORMAL); 5{'hsC  
 bTray=FALSE; AJ7w_'u=@  
} _v&fIo  
6:5K?Yo  
void CCaptureDlg::OnChange() )R7Sh51P  
{ zamMlmls^  
 RegisterHotkey(); h'"m,(a   
} Na91K4r#  
`#$}P;W  
BOOL CCaptureDlg::RegisterHotkey() \:;MFG'  
{ irQ'Rm [  
 UpdateData(); L('1NN 2  
 UCHAR mask=0; $e+sqgU  
 UCHAR key=0; 7I;kh`H$(f  
 if(m_bControl) 8 #4K@nm5  
  mask|=4; V|u2(*  
 if(m_bAlt)  uo`R  
  mask|=2; yX!u&  
 if(m_bShift) -,")GA+[7  
  mask|=1; ! VR&HEru  
  key=Key_Table[m_Key.GetCurSel()]; D1rVgM  
 if(bRegistered){ u=0O3-\h  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); {JfQQP&FV  
  bRegistered=FALSE; |<Ls;:5.  
 } =\6)B{#T  
 cMask=mask; ,' k?rQ  
 cKey=key; e)uC  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Dck/Ea  
 return bRegistered; aEN` `  
} %O`@}Tg  
m]jA(  
  四、小结 EL~$7 J  
IWE([<i}i[  
  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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