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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: [+ *$\  
  ;R=.iOn  
  一、实现方法 BG^C9*ZuP  
R .[Z]-X  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: _{vkX<s  
:M{Y,~cP  
#pragma data_seg("shareddata") qzw'zV  
HHOOK hHook =NULL; //钩子句柄 iGDLZE+?  
UINT nHookCount =0; //挂接的程序数目 cH-@V<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]{ BE r*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 0,s$T2  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;VO.!5W@eg  
static int KeyCount =0; aKUS5jDu  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ;?}l  
#pragma data_seg() XS0xLt=  
)4?x5#  
  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。 Ed0IWPx  
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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: @\oz4^  
v]% WH~>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR dLsn\m>  
cKey,UCHAR cMask) xCzebG["  
{ b96%")  
 BOOL bAdded=FALSE; B()/.w?A  
 for(int index=0;index<MAX_KEY;index++){ fW`&'!  
  if(hCallWnd[index]==0){ 1Kvx1p   
   hCallWnd[index]=hWnd; i`/+,<  
   HotKey[index]=cKey; xt'tL:d  
   HotKeyMask[index]=cMask; .,~(%#Wl$  
   bAdded=TRUE; A`}yBSb  
   KeyCount++; 3Y)PU=  
   break; S0g'r !;6  
  } aw ?=hXR!  
 } =z{JgD/  
 return bAdded; +5.t. d  
} :0K8h  
//删除热键 E| YdcS  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) bsxTqJ  
{ #>Y'sd5'A  
 BOOL bRemoved=FALSE; )5%C3/Dl!  
 for(int index=0;index<MAX_KEY;index++){ 6*l^1;U  
  if(hCallWnd[index]==hWnd){ 4`Nt{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ vvB(r!  
    hCallWnd[index]=NULL; -16K7yk  
    HotKey[index]=0; /sR%]q |L  
    HotKeyMask[index]=0; j` E +qk  
    bRemoved=TRUE; O=)  
    KeyCount--; H$ftGwS8  
    break; qj0 1]  
   } '`Bm'Dd  
  } ky>wOaTmN6  
 } NVIK>cT6  
 return bRemoved; o ]Jv;Iy@?  
} 4> ^K:/y  
r4x3$M c  
\^1+U JU  
  DLL中的钩子函数如下: &`Y!;@K9W#  
xX0-]Y h:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) PqNFyQkl  
{ H7+X&#s%  
 BOOL bProcessed=FALSE; E^_w I>  
 if(HC_ACTION==nCode) iFSJL,QZ3  
 { D2YZ9e   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @ P@c.*}s  
   switch(wParam) %pu Lr'Y  
   {  DlMe5=n -u  
    case VK_MENU: #X: 'aj98  
     MaskBits&=~ALTBIT; @4%L36k  
     break; ULc`~]  
    case VK_CONTROL: J68j=`Y  
     MaskBits&=~CTRLBIT; I"AYWo?  
     break; Ub0/r$]DK  
    case VK_SHIFT: D7]# Xk2  
     MaskBits&=~SHIFTBIT; l ?Y_~Wuw  
     break; ^^i6|l1  
    default: //judge the key and send message d;Hn#2C  
     break; syx\gz  
   } G.+l7bnZM  
   for(int index=0;index<MAX_KEY;index++){ 9 7%0;a8  
    if(hCallWnd[index]==NULL) JB</euyV  
     continue; BY\:dx)mK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oRN-xng  
    { %CZ-r"A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,3v+PIcMM+  
     bProcessed=TRUE; s#h8%['  
    } k&#a\OJ7u  
   } s57N) 0kP  
  } sGY_{CZ:  
  else if((lParam&0xc000ffff)==1){ //有键按下 k>}g\a,  
   switch(wParam) rA0,`}8\  
   { N-lGa@ j  
    case VK_MENU: NRnRMY-  
     MaskBits|=ALTBIT; 0U66y6  
     break; )PkNWj6%y  
    case VK_CONTROL: -B#yy]8  
     MaskBits|=CTRLBIT;  g]*  
     break; eRbGZYrJ  
    case VK_SHIFT: ^n#1<K[E  
     MaskBits|=SHIFTBIT; ]!:oYAm  
     break; qo+N,x9o  
    default: //judge the key and send message &m3.h!dq  
     break; ;TQf5|R\K  
   } qZ@0]"h  
   for(int index=0;index<MAX_KEY;index++){ zWw2V}U!  
    if(hCallWnd[index]==NULL) Bhp OXqg  
     continue; @/ J [t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `&M{cfp_  
    { 2Zuq?1=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,O1O8TwUB0  
     bProcessed=TRUE; r%wA&FQ8U  
    } ^IZ)#1U  
   } 6 y"-I !&  
  } LL!.c  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 g}&hl"j  
   for(int index=0;index<MAX_KEY;index++){ k.h`Cji@  
    if(hCallWnd[index]==NULL) Z>F^C}8f  
     continue; C7T(+Wd!,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @J[6,$UVu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); : Ud[f`t  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 YF#H Sf7  
   } F0~k1TDw  
  } l>lW]W  
 } ]!1OH |Ad  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?wMHS4  
} K*K1(_x=  
5_K5?N  
  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: F}Mhs17!|  
Jsg I'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;S$Ll*f>D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :/YO ni1h  
JnD {J`:  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: &a> lWE  
y$ Zj?Dd#  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) > 1L=,M  
{ PZ:u_*Vu`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) O|kKwadC  
 { Q^}%c U0  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 71FeDpe  
  SaveBmp(); \a "Ct'  
  return FALSE; G" b60RQ  
 } BOlAm*tFt  
 …… //其它处理及默认处理 lw8"'0  
} x9>\(-uU  
VCNT4m  
pvWau1ArNq  
  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。 <Pqv;WI|R  
`znB7VQ0  
  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。 ?9j{V7h  
&'|B =7  
  二、编程步骤 h4&;?T S  
;'T{li2  
  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"; v|Jlf$>  
h SqY$P  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; &Y|Xd4:  
x!S;SU  
  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; Ftb%{[0}u3  
L/}iy}  
  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; xIbMs4'iEx  
k@!r#`j3  
  5、 添加代码,编译运行程序。 4YG/`P  
x  FJg  
三、程序代码 F SMj  
KM?1/KZ/~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 9G?ldp8  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) V+MK'<#B  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ t *6loS0+  
#if _MSC_VER > 1000 "vF MSY  
#pragma once =?}twC$  
#endif // _MSC_VER > 1000 ux2013C_  
#ifndef __AFXWIN_H__ ?4t-caK^u  
#error include 'stdafx.h' before including this file for PCH 1V&PtI3 !!  
#endif U0B2WmT~Q  
#include "resource.h" // main symbols  GrJ#.  
class CHookApp : public CWinApp UgHf*m  
{ cleOsj;S  
 public: .,2V5D-${  
  CHookApp(); ?v]-^X=&  
  // Overrides rp! LP#*  
  // ClassWizard generated virtual function overrides E,G<_40  
  //{{AFX_VIRTUAL(CHookApp) ;#?M)o:q  
 public: ucYkxi`x  
  virtual BOOL InitInstance(); Ry;$^.7%  
  virtual int ExitInstance(); Q ~|R Z7G  
  //}}AFX_VIRTUAL O_@2;iD^^  
  //{{AFX_MSG(CHookApp) T(X:Yw  
  // NOTE - the ClassWizard will add and remove member functions here. -mNQ;zI1  
  // DO NOT EDIT what you see in these blocks of generated code ! IY(h~O  
  //}}AFX_MSG dT@UK^\  
  DECLARE_MESSAGE_MAP() 4z4v\IpB  
}; o.:p_(|hI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); S 4vbN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 85U.wpG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O??vm?eo  
BOOL InitHotkey(); 'E]A.3-Mt  
BOOL UnInit(); Ng<1Sd|MV  
#endif :{g7lTM  
g#^|oYuH6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9V!-ZG  
#include "stdafx.h" `_AM` >_  
#include "hook.h" 0LVE@qEL  
#include <windowsx.h> 0A$SYF$O+[  
#ifdef _DEBUG oN2=DYC41  
#define new DEBUG_NEW ,\ldz(D?+  
#undef THIS_FILE CDg AGy  
static char THIS_FILE[] = __FILE__; SBKeb|H8  
#endif rnhFqNT:  
#define MAX_KEY 100 $%qg"  
#define CTRLBIT 0x04 E{^^^"z P  
#define ALTBIT 0x02 E:A!wS`"  
#define SHIFTBIT 0x01 IhonnLLW  
#pragma data_seg("shareddata") L ^Y3=1#"g  
HHOOK hHook =NULL; Z[#IfbYt  
UINT nHookCount =0; Ueyw;Y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey n[k1np$7?6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ?T*";_o,B  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey XF,<i1ZlM  
static int KeyCount =0; )q^ Bj$  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift P;91~``b-  
#pragma data_seg() f@z*3I;  
HINSTANCE hins; L/r{xS  
void VerifyWindow(); vE\lp8j+  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) q(]f]Vl|0  
//{{AFX_MSG_MAP(CHookApp) `| 9Ku  
// NOTE - the ClassWizard will add and remove mapping macros here. Lyoor1   
// DO NOT EDIT what you see in these blocks of generated code! QXQ  
//}}AFX_MSG_MAP Bku' H  
END_MESSAGE_MAP() hw,^G5m  
>]$aoA#  
CHookApp::CHookApp() }C6@c1myq-  
{ Q7Ij4  
 // TODO: add construction code here, c?6d2jH.  
 // Place all significant initialization in InitInstance Q_P5MLU>  
} L7q |^`  
H^(L90  
CHookApp theApp; v[#)GB _5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) cdp0!W4Gi  
{ D1"7s,Hmu  
 BOOL bProcessed=FALSE; /8eW@IO.F  
 if(HC_ACTION==nCode) c~tAvDX  
 { vjK, I9  
  if((lParam&0xc0000000)==0xc0000000){// Key up 0-xCp ~vE  
   switch(wParam) vA?_-.J  
   { n6f3H\/P&  
    case VK_MENU: #ooc)),  
     MaskBits&=~ALTBIT; f'{>AKi=C  
     break; 'h *Zc}Q:  
    case VK_CONTROL: 'U)8rR  
     MaskBits&=~CTRLBIT; :m`/Q_y"  
     break; gue(C(~.k_  
    case VK_SHIFT: 1L[S*X  
     MaskBits&=~SHIFTBIT; MW@DXbKVl  
     break; XVUf,N,  
    default: //judge the key and send message ~77 5soN  
     break; J?jeYW   
   } :R+],m il  
   for(int index=0;index<MAX_KEY;index++){ \C/z%Hf7-  
    if(hCallWnd[index]==NULL) g _ M-F  
     continue; 6E+=Xi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *T4ge|zUc  
    { 5u,sx664  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R;THA!  
     bProcessed=TRUE; JSjYC0e  
    } q|{tQJfYg  
   } k>{-[X,/OV  
  } Z=9dMND  
  else if((lParam&0xc000ffff)==1){ //Key down G[6=u|(M  
   switch(wParam) tA qs2  
   { < l[` "0  
    case VK_MENU: V\zsDP  
     MaskBits|=ALTBIT; `^%GN8d}nm  
     break; "6V_/u5M;=  
    case VK_CONTROL: hEOJb @:R  
     MaskBits|=CTRLBIT; $FCw$+w  
     break; ^Kw(& v  
    case VK_SHIFT: /=M.-MU2  
     MaskBits|=SHIFTBIT; v MWC(m  
     break; faVS2TN4  
    default: //judge the key and send message s^PmnFR  
     break; Y'_ D<Mp  
   } g{a d0.y,  
   for(int index=0;index<MAX_KEY;index++) {Gkn_h-^  
   { )6G+tU'  
    if(hCallWnd[index]==NULL) |Ow$n  
     continue; 7SHo%b A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Gg+YfY_  
    { n\~yX<;X3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m|dF 30~A  
     bProcessed=TRUE; 1UyH0`&  
    } Fe4esg-B<  
   } w4}(Ab<Y  
  } >@Khm"/T  
  if(!bProcessed){ JS2!)aqc  
   for(int index=0;index<MAX_KEY;index++){ {G.{a d  
    if(hCallWnd[index]==NULL) 6QptKXu7  
     continue; yHw!#gWM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) bV7QVu8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rxkBg0Z`a  
   } m t.,4  
  } 4`0;^K.  
 } D[W}[r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2$Y3[$  
} %0(>!SY  
6cZ  C  
BOOL InitHotkey() HjPH  
{ L4mTs-M.  
 if(hHook!=NULL){ hGKdGu`0  
  nHookCount++; +}]wLM}\UF  
  return TRUE; @}{VM)Fc+  
 } I)uASfT$  
 else Y;PDZb K3  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 5oa]dco  
  if(hHook!=NULL) Sl~C0eO  
   nHookCount++; -(  ER4#  
  return (hHook!=NULL); h=mv9=x  
} Faw. GU  
BOOL UnInit() Q }8C  
{ nTQ (JDf  
 if(nHookCount>1){ &`5 :G LV  
  nHookCount--; lc-*8eS  
  return TRUE; +{bh  
 } v_.j/2U  
 BOOL unhooked = UnhookWindowsHookEx(hHook); [ 1D)$"  
 if(unhooked==TRUE){ A'(k Yc  
  nHookCount=0; vev8l\  
  hHook=NULL; ,XP@ pi  
 } '|+=B u  
 return unhooked;  m"1 ?  
} p!V) 55J*  
@@xF#3   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `}n0=E  
{ /3;=xZq  
 BOOL bAdded=FALSE; l>33z_H^  
 for(int index=0;index<MAX_KEY;index++){ ";58B} ki  
  if(hCallWnd[index]==0){ _"`/^L`Q?  
   hCallWnd[index]=hWnd; P:vX }V |[  
   HotKey[index]=cKey; k.ww-nH  
   HotKeyMask[index]=cMask; j[BgP\&,  
   bAdded=TRUE; !-@SS>  
   KeyCount++; wf^cyCR0  
   break; _4De!q0(  
  } lHRK'? Q  
 } ^&e;8d|f{  
 return bAdded; QTJrJD  
} ol1AD: Ho  
]dQZ8yVK  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |Yg}WHm  
{ <`b|L9  
 BOOL bRemoved=FALSE; f61]`@Bk  
 for(int index=0;index<MAX_KEY;index++){ ug>]U ~0  
  if(hCallWnd[index]==hWnd){ E ,Dlaq  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )z|_*||WU^  
    hCallWnd[index]=NULL; J\9jsx!WQ  
    HotKey[index]=0; F\l!A'Q+t  
    HotKeyMask[index]=0; ZlUFJ*pk  
    bRemoved=TRUE; I\)N\mov e  
    KeyCount--; +# A|Zp<  
    break; jh-kCF  
   } mRNHq3  
  } S:DcfR=a  
 } + 4++Z  
 return bRemoved; d u _O}x  
} vHoT@E#}'  
!k ;[^>  
void VerifyWindow() ',<{X (#(  
{ P[r}(@0rJ  
 for(int i=0;i<MAX_KEY;i++){ A89Y;_4y  
  if(hCallWnd!=NULL){ 4 {uJ||!  
   if(!IsWindow(hCallWnd)){ ei(| 5h  
    hCallWnd=NULL; R#r h  
    HotKey=0; \Gv-sA  
    HotKeyMask=0; s"gKonwI2  
    KeyCount--; 15RI(BN   
   } H d96[Uo  
  } B/[hi%~  
 } ^!XU+e+:0  
} HE4`9$kVLr  
qLU15cOM  
BOOL CHookApp::InitInstance() Ul7,k\q@  
{ pvK \fSr  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1j_aH#Fz:  
 hins=AfxGetInstanceHandle(); }C9VTJs|  
 InitHotkey(); &n,xGIG  
 return CWinApp::InitInstance(); ' h0\4eu  
} /6?tgr  
C8O7i[uc  
int CHookApp::ExitInstance() "@F*$JGT y  
{ OD>u$tI9  
 VerifyWindow(); !:R^}pMhIk  
 UnInit(); U]1>?,Nk'3  
 return CWinApp::ExitInstance(); N GX-'w  
} b*9m2=6  
:C}KI)  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $L $j KNwf  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) S+4I[|T]Y  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ta!m%=8  
#if _MSC_VER > 1000 pO@k@JZ  
#pragma once +^o3}`  
#endif // _MSC_VER > 1000 ]a &x'  
@8T Vr2uy  
class CCaptureDlg : public CDialog qhv4R|)  
{ il 8A&`%  
 // Construction vUA)#z<  
 public: d7n4zx1Hh  
  BOOL bTray; LL6ON }  
  BOOL bRegistered; fbW,0  
  BOOL RegisterHotkey(); MV:<w3!  
  UCHAR cKey; Lk$Je O  
  UCHAR cMask; S.?\>iH[  
  void DeleteIcon(); |>m# m*{S  
  void AddIcon(); !ds"88:5^  
  UINT nCount; 1VPfa  
  void SaveBmp(); t/EMBfLc  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Y:#kel<  
  // Dialog Data ~`W6O>  
  //{{AFX_DATA(CCaptureDlg) 2xz%'X%  
  enum { IDD = IDD_CAPTURE_DIALOG }; '2i)#~YO<  
  CComboBox m_Key; !rN#PF>  
  BOOL m_bControl; `t/@ L:  
  BOOL m_bAlt; pEqr0Qwh  
  BOOL m_bShift; '=@H2T6=  
  CString m_Path; !nqm ;96  
  CString m_Number; C_g"omw40  
  //}}AFX_DATA rA>A=,  
  // ClassWizard generated virtual function overrides uH~ TugQ~  
  //{{AFX_VIRTUAL(CCaptureDlg) +A.a~Stt  
 public: @8x6#|D  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 3e!a>Gl*  
 protected: Q:Nwy(,I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2!"\;/  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ,AFC1t[0  
  //}}AFX_VIRTUAL ~ L i%  
  // Implementation : Oz7R:  
 protected: Sj=69>m]5  
  HICON m_hIcon; ?Sd~u1w8K  
  // Generated message map functions !Sr0Im0  
  //{{AFX_MSG(CCaptureDlg) 2rE~V.)%  
  virtual BOOL OnInitDialog(); H8Z Z@@ qm  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !EyGJa[ i  
  afx_msg void OnPaint(); 8M(|{~~3:  
  afx_msg HCURSOR OnQueryDragIcon(); is _ dPc  
  virtual void OnCancel(); Q'%5"&XFD  
  afx_msg void OnAbout(); J7 zVi  
  afx_msg void OnBrowse(); !<UEq`2  
  afx_msg void OnChange(); Z1MJ!{@6  
 //}}AFX_MSG ?AM 8*w  
 DECLARE_MESSAGE_MAP() EY[Q%  
}; Bb2r95h}^  
#endif aZ`_W|  
olQ8s *  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file AD4L`0D  
#include "stdafx.h"  6@Z'fT4  
#include "Capture.h" s5Bmv\e.i5  
#include "CaptureDlg.h" Z2pN<S{5  
#include <windowsx.h> \w@_(4")Qb  
#pragma comment(lib,"hook.lib") ]oWZ{#r2  
#ifdef _DEBUG :6Pc m3  
#define new DEBUG_NEW # |*,zIYo  
#undef THIS_FILE Qi'WV9ke  
static char THIS_FILE[] = __FILE__; ,VcD vZ7  
#endif ^: rNoo  
#define IDM_SHELL WM_USER+1 GJl@ag5h]!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +8@`lDnr  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +e3WwUx  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; o- e,  
class CAboutDlg : public CDialog [C~)&2wh>  
{ ^Hhw(@`qf  
 public: %JA&O  
  CAboutDlg(); >[P7Zlwv4  
  // Dialog Data ws=9u-  
  //{{AFX_DATA(CAboutDlg) GVHfN5bTqn  
  enum { IDD = IDD_ABOUTBOX }; +68K[s,FD  
  //}}AFX_DATA ~)_ ?:.Da  
  // ClassWizard generated virtual function overrides :pF]TY"K.  
  //{{AFX_VIRTUAL(CAboutDlg) O]r3?=  
 protected: la"A$Tbu~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G*w W&R)  
  //}}AFX_VIRTUAL re 1k]  
  // Implementation g:3'x/a1  
 protected: A>1p]#  
  //{{AFX_MSG(CAboutDlg) .0*CT:1=0  
  //}}AFX_MSG GPqB\bxb'  
  DECLARE_MESSAGE_MAP() A(@gv8e[H^  
}; UEYM;$_@4o  
EwBN+v;)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) tP^mq>  
{ p31rhe   
 //{{AFX_DATA_INIT(CAboutDlg) SAo \H  
 //}}AFX_DATA_INIT I3rnCd(  
} I~5fz4Q  
O[(HE 8E  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?e|:6a+[f  
{ E<G@LT  
 CDialog::DoDataExchange(pDX); -$MC  
 //{{AFX_DATA_MAP(CAboutDlg) "i<3}6/*  
 //}}AFX_DATA_MAP MHT,rqG  
} w5/  X {  
`zOAltfd  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) <B{VL8IA>  
 //{{AFX_MSG_MAP(CAboutDlg) Wv*BwiQ  
 // No message handlers $^D(%  
 //}}AFX_MSG_MAP (>5VS  
END_MESSAGE_MAP() 3L%r_N*a  
FC- *?  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) po$ynp756  
: CDialog(CCaptureDlg::IDD, pParent) mW(_FS2%,  
{ ?OYwM?Uf  
 //{{AFX_DATA_INIT(CCaptureDlg) RDZh>K PG  
  m_bControl = FALSE; a4qpnr]0  
  m_bAlt = FALSE; sluZ-,zE  
  m_bShift = FALSE; j[Zni D  
  m_Path = _T("c:\\"); xW;[}t-QS  
  m_Number = _T("0 picture captured."); G~hILW^  
  nCount=0; > FcA ,  
  bRegistered=FALSE; C05{,w?  
  bTray=FALSE; qsRfG~Cg  
 //}}AFX_DATA_INIT "91At b;hJ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 W]Y!ZfGnN  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @`+$d=rO`  
} gsq[ 9  
f(MHU   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) LOG*K;v3  
{ k@)m-K  
 CDialog::DoDataExchange(pDX); 714nUA872  
 //{{AFX_DATA_MAP(CCaptureDlg) 3R[J,go  
  DDX_Control(pDX, IDC_KEY, m_Key); E9*?G4P{l  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 1YD.jU^;HD  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Tvw2py q  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1~u\]Zi=D  
  DDX_Text(pDX, IDC_PATH, m_Path); j#>![km Mu  
  DDX_Text(pDX, IDC_NUMBER, m_Number); &EJ,k'7$  
 //}}AFX_DATA_MAP 1Y"qQp  
} Ri6 br  
=ZIFS  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  eV=sDx  
//{{AFX_MSG_MAP(CCaptureDlg) ./*,Thc  
 ON_WM_SYSCOMMAND() jL).B&  
 ON_WM_PAINT() T:~W.3  
 ON_WM_QUERYDRAGICON()  (mD:[|.  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) PL_wa(}y]D  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 3rdxXmx  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 2DqHqq9m  
//}}AFX_MSG_MAP SK}g(X7IWH  
END_MESSAGE_MAP() kQ'xs%Fw  
? /X6x1PN  
BOOL CCaptureDlg::OnInitDialog() MC)W?  
{ Y +yvv{01  
 CDialog::OnInitDialog(); n.UM+2G  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >#n-4NZ;p9  
 ASSERT(IDM_ABOUTBOX < 0xF000); ZO6bG$y64  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Wv/5#_  
 if (pSysMenu != NULL) ~{$'sp0  
 { ZUI9[A?  
  CString strAboutMenu; 4xn^`xf9  
  strAboutMenu.LoadString(IDS_ABOUTBOX); a} 7KpKCD  
  if (!strAboutMenu.IsEmpty()) #UeU:RJ1  
  { A8/4:>Is  
   pSysMenu->AppendMenu(MF_SEPARATOR); yf^gU*  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +~.Jw#HqS  
  } Tka="eyIj3  
 } mBkQ 8e  
 SetIcon(m_hIcon, TRUE); // Set big icon |Qm%G\oB?  
 SetIcon(m_hIcon, FALSE); // Set small icon 0]0M>vx u  
 m_Key.SetCurSel(0); `ViNSr):J  
 RegisterHotkey(); :>ST)Y@]w  
 CMenu* pMenu=GetSystemMenu(FALSE); < io8 b|A  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); %= ;K>D  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :@A;!'zpL  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); M +q 7h+HP  
 return TRUE; // return TRUE unless you set the focus to a control V)jhyCL  
} YVp0}m  
:2gO) 'cD  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) vrx3O  
{ CnA)>4E*'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) emIbGkH  
 { Pg C]@Q%  
  CAboutDlg dlgAbout; G"sc;nT  
  dlgAbout.DoModal(); m 4LM10  
 } RA67w&  
 else %b4(wn?n:B  
 { /UyE- "S  
  CDialog::OnSysCommand(nID, lParam); , .F+x}  
 } $oj<yH<i  
} [kkcV5I-  
Z}StA0F_  
void CCaptureDlg::OnPaint() ,R6$SrNcd  
{ XKIJ6M~5k  
 if (IsIconic()) k5 l~  
 { xF+x I6  
  CPaintDC dc(this); // device context for painting M_I\:Q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9DE)5/c`v  
  // Center icon in client rectangle @6 `@.iZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); +c_CYkHJ/  
  int cyIcon = GetSystemMetrics(SM_CYICON); !Ve3:OZ.nO  
  CRect rect; xWV7#Z7  
  GetClientRect(&rect); G<1mj!{Vp  
  int x = (rect.Width() - cxIcon + 1) / 2; >(a_9l;q  
  int y = (rect.Height() - cyIcon + 1) / 2; Xq^{P2\w1  
  // Draw the icon " N4]e/.V  
  dc.DrawIcon(x, y, m_hIcon); niBpbsO  
 } L]")TQ  
 else 4`]1W,t  
 { 1_]l|`Po  
  CDialog::OnPaint(); e|y~q0Q$  
 } "ET"dMxU  
} #JM*QVzv  
biK.HL\V  
HCURSOR CCaptureDlg::OnQueryDragIcon() &|*|  
{ wyM3|%RZ  
 return (HCURSOR) m_hIcon; d<e.`dhc  
} /Vc!N)  
D~>P/b)v{j  
void CCaptureDlg::OnCancel() an~Kc!Oki  
{ KguFU  
 if(bTray) <{uIB;P  
  DeleteIcon(); YdaJ&  
  CDialog::OnCancel(); Vtri"G8 aB  
} (#k#0T kE  
d a9 *>+[  
void CCaptureDlg::OnAbout() nfB9M1Svn  
{ hi uPvi}  
 CAboutDlg dlg; w+H=Xh4t  
 dlg.DoModal(); 7]bq s"t  
} 0T;WN$W|  
&Y$rVBgQ  
void CCaptureDlg::OnBrowse() H\vO0 <X  
{ 5H2|:GzUc  
 CString str; )G&OX  
 BROWSEINFO bi; Kfl+8UR5=  
 char name[MAX_PATH]; =QRZ(2Wq  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ZS]e}]Zwp  
 bi.hwndOwner=GetSafeHwnd(); ESI}+  
 bi.pszDisplayName=name; D%v yO_k  
 bi.lpszTitle="Select folder"; Wd# 6Y}:  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ]B||S7idq  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 'Ud5;?{  
 if(idl==NULL) zFIKB9NUn  
  return; ]=Q'1%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +/tD$  
 str.ReleaseBuffer(); GS%Dn^l  
 m_Path=str; I'wAgf6W  
 if(str.GetAt(str.GetLength()-1)!='\\') X)+N>8o?N  
  m_Path+="\\"; ^xrR3m*d  
 UpdateData(FALSE); MiRB*eA  
} ~ 5b %~:  
107SXYdhI  
void CCaptureDlg::SaveBmp() EzaOg|  
{ uPPe"$  
 CDC dc; gu!A:Q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); arJ[.f9s  
 CBitmap bm; K(^x)w r-:  
 int Width=GetSystemMetrics(SM_CXSCREEN); P.0-(  
 int Height=GetSystemMetrics(SM_CYSCREEN); I( e>ff  
 bm.CreateCompatibleBitmap(&dc,Width,Height); *RO ~%g  
 CDC tdc; ~S9nLb:O{  
 tdc.CreateCompatibleDC(&dc); FKP^f\!M  
 CBitmap*pOld=tdc.SelectObject(&bm); PhQD}|S  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); K^ lVng  
 tdc.SelectObject(pOld); frt?*|:  
 BITMAP btm; =zKp(_[D  
 bm.GetBitmap(&btm); x$E l7=.  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; pFuQ!7Uk  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $O#h4L_  
 BITMAPINFOHEADER bih; >*MB_m2|  
 bih.biBitCount=btm.bmBitsPixel; 6dh PqL  
 bih.biClrImportant=0; =|V3cM4'  
 bih.biClrUsed=0; 6`i'  
 bih.biCompression=0; ZI1RB fR  
 bih.biHeight=btm.bmHeight; zV]0S o  
 bih.biPlanes=1; pP#?|  
 bih.biSize=sizeof(BITMAPINFOHEADER); tXx9N_/  
 bih.biSizeImage=size;  O>3'ylBQ  
 bih.biWidth=btm.bmWidth; q% "nk  
 bih.biXPelsPerMeter=0; m:t $&  
 bih.biYPelsPerMeter=0; 1Sy#*  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,rKN/{M!  
 static int filecount=0; DCm;dh  
 CString name; DuWP)#kg  
 name.Format("pict%04d.bmp",filecount++); ~gf $ L9  
 name=m_Path+name; LLE~V~j  
 BITMAPFILEHEADER bfh; e0TnA N  
 bfh.bfReserved1=bfh.bfReserved2=0; ) E\pQ5&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @l8?\^N  
 bfh.bfSize=54+size; SCo9[EJ  
 bfh.bfOffBits=54; UpITx]y?"m  
 CFile bf; [|YMnV<B  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ">o/\sXeH  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); :X#(T- !t  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ch&r.  
  bf.WriteHuge(lpData,size); x[X.// :  
  bf.Close(); $#!~K2$  
  nCount++; ,ZSuo4  
 } +38t82%YWo  
 GlobalFreePtr(lpData); VYwaU^  
 if(nCount==1) s-*XAn ot  
  m_Number.Format("%d picture captured.",nCount); >dM'UpN@  
 else +%yh@X6  
  m_Number.Format("%d pictures captured.",nCount); ps]6,@uyB  
  UpdateData(FALSE); 3B0%:Jj  
} ;# {x_>M  
g^idS:GtX5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)  LCG<  
{ _YY)-H  
 if(pMsg -> message == WM_KEYDOWN) }LRAe3N%8  
 { U{x'@/Ld  
  if(pMsg -> wParam == VK_ESCAPE) kB 2bT}  
   return TRUE; sw&Qks? V  
  if(pMsg -> wParam == VK_RETURN) .cb mCFXL  
   return TRUE; Zj JD@,j  
 } %F7aFvl*  
 return CDialog::PreTranslateMessage(pMsg); ^ey\ c1K  
} m} V,+E  
IH0Uq_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0C7"*H0 R  
{ bhI8b/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ S$#Awen"@  
  SaveBmp(); myo/}58Nv  
  return FALSE; )-9/5Z0v  
} &`9lIVB,K  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =FE,G*  
 CMenu pop; $$4% .J26Z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); kO4C^pl"v  
 CMenu*pMenu=pop.GetSubMenu(0); 4 qnQF]4  
 pMenu->SetDefaultItem(ID_EXITICON); DFiexOb  
 CPoint pt; 5u&jNU5m_  
 GetCursorPos(&pt); mB\5bSFY`  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  }N[sydL  
 if(id==ID_EXITICON) )*uI/E  
  DeleteIcon(); bIH2cJ  
 else if(id==ID_EXIT) 1{wy%|H\  
  OnCancel(); 5 xiYCOy  
 return FALSE; y`N1I  
} `XD$1>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); q<1@ut  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) K,RIa0)  
 AddIcon(); D,7! /u'  
 return res; #8`G&S*  
} R 'F|z{8  
cr!I"kTgD  
void CCaptureDlg::AddIcon() ka5>9E  
{ ugCc&~`  
 NOTIFYICONDATA data; R6!3Y/Q@  
 data.cbSize=sizeof(NOTIFYICONDATA); ":Q70*xSm  
 CString tip; us]ah~U6A  
 tip.LoadString(IDS_ICONTIP); xj}N;FWo  
 data.hIcon=GetIcon(0); aCMcu\rd  
 data.hWnd=GetSafeHwnd(); $lv  g.u  
 strcpy(data.szTip,tip); v|hi;l@7E  
 data.uCallbackMessage=IDM_SHELL; K+7xjFoDIR  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [;2v[&Po  
 data.uID=98; u66w('2  
 Shell_NotifyIcon(NIM_ADD,&data); ! 87ebo  
 ShowWindow(SW_HIDE); cz0tnF*&  
 bTray=TRUE; >#'6jm  
} b/ynCf8X  
bi5'-.B  
void CCaptureDlg::DeleteIcon() cx02b-O  
{ .`iq+i~  
 NOTIFYICONDATA data; l"- D@]"  
 data.cbSize=sizeof(NOTIFYICONDATA); FrVD~;  
 data.hWnd=GetSafeHwnd(); iU3co|q7  
 data.uID=98; NO<myN+N  
 Shell_NotifyIcon(NIM_DELETE,&data); DQ~@=%?ni  
 ShowWindow(SW_SHOW); X@cV']#V  
 SetForegroundWindow(); "ZH1W9A  
 ShowWindow(SW_SHOWNORMAL); c>^_4QQ  
 bTray=FALSE; c{E-4PYbah  
} t512]eqhb(  
T^79p$  
void CCaptureDlg::OnChange() )&w\9}B:  
{ B1GSZUd^?0  
 RegisterHotkey(); )~J/,\  
} &K7g8x"x.  
Lt*H|9  
BOOL CCaptureDlg::RegisterHotkey() Ah"Rx A  
{ j/W#=\xz  
 UpdateData(); f(3#5288  
 UCHAR mask=0; &38Fj'l  
 UCHAR key=0; lmod8B  
 if(m_bControl) bi_R.sfK&  
  mask|=4; J/mLB7^R  
 if(m_bAlt) IXH;QwR:  
  mask|=2; :O{:;X)  
 if(m_bShift) SVR AkP-  
  mask|=1; ;zGGT^Dn  
  key=Key_Table[m_Key.GetCurSel()]; gh~C.>W}q+  
 if(bRegistered){ R&-bA3w$  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); s0\X%U("  
  bRegistered=FALSE; R)H@'X  
 } ~"LOw_BRh  
 cMask=mask; dx~F [  
 cKey=key; 4(Mt6{q  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #de]b  
 return bRegistered; 2Gj&7A3b  
} F|"NJ*o}  
yn7n  
  四、小结 ZJx:?*0a  
:]]amziP&  
  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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