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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: :~Z -K\  
  k+D"LA%J  
  一、实现方法 $gv3Up"U  
7l~d_<h  
  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: +[R,wsG  
&O:IRR7p  
#pragma data_seg("shareddata") $k,wA8OZ-  
HHOOK hHook =NULL; //钩子句柄 8`{)1.d5[  
UINT nHookCount =0; //挂接的程序数目 ~g|Z6-?4Jj  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5S EyAhB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 l 7XeZ} S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 2.>WR~ \  
static int KeyCount =0; $q iY)RE  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 a^ _ _Z3g,  
#pragma data_seg() ;tZ;C(;<  
|K(2_Wp  
  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。 1[g -f ,  
K|{IX^3)V  
  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: iiw\  
 `u 't  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR o^!_S5zKe.  
cKey,UCHAR cMask) RZgklEU  
{ 6VsgZ"Il  
 BOOL bAdded=FALSE; ye-EJDZN  
 for(int index=0;index<MAX_KEY;index++){ A%[ BCY_  
  if(hCallWnd[index]==0){ `Nnaw+<]  
   hCallWnd[index]=hWnd; 4*D'zJsJ  
   HotKey[index]=cKey; L*QX21@wC  
   HotKeyMask[index]=cMask; 0'3f^Ajf  
   bAdded=TRUE; ~v$1@DQ}  
   KeyCount++; 0{q>'dv  
   break; 2:6W_[7l!  
  } s<XAH7?0  
 } q9h 3/uTv  
 return bAdded; S <RbC  
} 2&,jO+BqE@  
//删除热键 2I@d=T{K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q:5^K  
{  mdtG W  
 BOOL bRemoved=FALSE; Xv&&U@7  
 for(int index=0;index<MAX_KEY;index++){ <l.l6okp  
  if(hCallWnd[index]==hWnd){ [qL{w&R  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ kF@Z4MB}yr  
    hCallWnd[index]=NULL; Km)VOX[ZZ  
    HotKey[index]=0; cEK<CV  
    HotKeyMask[index]=0; mM$|cge"  
    bRemoved=TRUE; sP'U9l  
    KeyCount--; AbExJ~JV\g  
    break; \2c 3Nsra  
   } 7G \a5  
  } E xls_oSp  
 } 28! ke  
 return bRemoved; s?5vJ:M Xr  
} ]J(BaX4  
lZr}F.7  
3-PqUJT$   
  DLL中的钩子函数如下: z|$M,?r'  
m4r<=o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Dx5X6t9=  
{ M/mm2?4  
 BOOL bProcessed=FALSE; `w_%HVw>"  
 if(HC_ACTION==nCode) zCe[+F  
 { \V_ Tc`  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 P U2^4h/[`  
   switch(wParam) o}p^q:T*  
   {  gWu<5Y=C  
    case VK_MENU: Bc*FH>E  
     MaskBits&=~ALTBIT; QMhvyzkS  
     break; "OO)m](w  
    case VK_CONTROL: II'"Nkxd  
     MaskBits&=~CTRLBIT; fjd)/Gg  
     break; 0 L$[w  
    case VK_SHIFT: S0' ACt`  
     MaskBits&=~SHIFTBIT; Ntt*}|:QV<  
     break; FTQNS8  
    default: //judge the key and send message M-8`zA2  
     break; *6bO2LO"  
   } vk4Q2P  
   for(int index=0;index<MAX_KEY;index++){ G`Df'Yy  
    if(hCallWnd[index]==NULL) 'N3)>!Y:8  
     continue; % aqP{mOO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |JLXgwML  
    { q|g>;_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); l86gs6>  
     bProcessed=TRUE; bs&>QsI?j  
    } Nl'@Y^8N  
   } we/sv9v}n  
  } `k6ZAOQtX  
  else if((lParam&0xc000ffff)==1){ //有键按下 p/U{*i ]t  
   switch(wParam) .>a [  
   { NZ"nG<;5  
    case VK_MENU: P?ms^   
     MaskBits|=ALTBIT; Rc vp@  
     break; Am!OLGG4  
    case VK_CONTROL: ka_(8  
     MaskBits|=CTRLBIT; c;Gf$9?iC  
     break; GO)5R,  
    case VK_SHIFT:  b]gVZ-  
     MaskBits|=SHIFTBIT; bE;c&g  
     break; T I|h  
    default: //judge the key and send message 3yrb7Rn3  
     break; SLW|)Q24  
   } E)`:sSd9  
   for(int index=0;index<MAX_KEY;index++){ 5P{[8PZxbV  
    if(hCallWnd[index]==NULL) ?C`r3  
     continue; `&9iC 4P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v5\5:b {/  
    { :8`~dj.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); N%F4ug@i   
     bProcessed=TRUE; (6Ciqf8  
    } DNr*|A2<  
   } "AP$)xM-:  
  } ~F^tLi!5  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 e%lxRN"b  
   for(int index=0;index<MAX_KEY;index++){ u].7+{  
    if(hCallWnd[index]==NULL) fx-8mf3  
     continue; S Rk%BJ? ~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pm=m~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \zc R7 5  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *M)M!jTv  
   } {;N2 &S o  
  } s"XwO8yhM  
 } /xSFW7d1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); = N;5T  
} K3Bw3j 9  
d%UzQ*s  
  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?1"2  
ez5J+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1F_$[iIX]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S:XsO9:{  
Gr4v&Mz:  
  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: ):[}NDmC  
&)jq3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L6ap |u  
{ ah%Ws#&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) XF+4*),  
 { eyuyaSE  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 9a @rsyX  
  SaveBmp(); 5rmU9L  
  return FALSE; :}yT?LIyP  
 } $}Ab R:z  
 …… //其它处理及默认处理 1BEs> Sm  
} IJ~j(.W  
! Sw=ns7  
M!kSt1  
  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。 1+gFfKq  
sPG500=)  
  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。 r ^\(M {  
|Iwglb!k  
  二、编程步骤 LRg]'?  
t>AOF\  
  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"; ZSs@9ej  
`KN>0R2k  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 3%bhW9H%  
$btu=_|f  
  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; 0QT:@v2R  
i!RfUod  
  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; 7FJ4;HLQ  
/y$Fw9R;  
  5、 添加代码,编译运行程序。 2l O(f+  
641P)  
三、程序代码 Av?R6  
i%JJ+9N  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL aG83@ABx  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) .1q}mw   
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ vc&v+5Y  
#if _MSC_VER > 1000 /OWwC%tM/  
#pragma once Scx!h.\5  
#endif // _MSC_VER > 1000 p0WUF\"  
#ifndef __AFXWIN_H__ p<{P#?4 g  
#error include 'stdafx.h' before including this file for PCH E]rXp~AZm  
#endif 5 ty2e`~K  
#include "resource.h" // main symbols F3EAjO)ch  
class CHookApp : public CWinApp @lF?+/=$  
{ Q"ZpT  
 public: 4~&3.1  
  CHookApp(); }%8ZN :  
  // Overrides vX\9#Hj  
  // ClassWizard generated virtual function overrides QM#Vl19>j(  
  //{{AFX_VIRTUAL(CHookApp) uE41"?GS  
 public: u\Ylo.)b  
  virtual BOOL InitInstance(); 9xO@_pkX  
  virtual int ExitInstance(); @ <{%r  
  //}}AFX_VIRTUAL Sz@z 0'  
  //{{AFX_MSG(CHookApp) Xg96I: r'p  
  // NOTE - the ClassWizard will add and remove member functions here. @t~y9UfF  
  // DO NOT EDIT what you see in these blocks of generated code ! S )rr  
  //}}AFX_MSG Q{|%kU"  
  DECLARE_MESSAGE_MAP() W06#|8,{v  
}; X2@Ef2EkM  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); C[<}eD4bV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g ns}%\,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9gcW;  
BOOL InitHotkey(); xy7A^7Li  
BOOL UnInit(); )b #5rQ  
#endif B`Z3e%g#  
Tc/^h 4xH  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. JI[8n$pr]  
#include "stdafx.h" !i)!|9e  
#include "hook.h" 1hY|XZ%qd  
#include <windowsx.h> iRnjN  
#ifdef _DEBUG qC> tni%  
#define new DEBUG_NEW Ohk\P;}  
#undef THIS_FILE `P;r[j"  
static char THIS_FILE[] = __FILE__; RJ'[m~yl5X  
#endif #\w N2`" W  
#define MAX_KEY 100 @  W>@6E  
#define CTRLBIT 0x04 (vO3vCYeQ  
#define ALTBIT 0x02 iHGVR  
#define SHIFTBIT 0x01 ng3ZK  
#pragma data_seg("shareddata") "00j]e.  
HHOOK hHook =NULL; <#h,_WP*  
UINT nHookCount =0; ; R}>SS'  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey k_,7#:+  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Xx{| [2`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^x\VMd3*w  
static int KeyCount =0; }ouGxs+^[  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift f%,S::%Ea  
#pragma data_seg() ] #@:VR  
HINSTANCE hins; /e0B$UymFu  
void VerifyWindow(); E:x@O8F  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) (p[#[CI9  
//{{AFX_MSG_MAP(CHookApp) n?fy@R  
// NOTE - the ClassWizard will add and remove mapping macros here. YCD |lL#  
// DO NOT EDIT what you see in these blocks of generated code! ?>h ~"D#  
//}}AFX_MSG_MAP [t?tLUg|6  
END_MESSAGE_MAP() x vs=T  
$Y|OGZH8E  
CHookApp::CHookApp() _d@YLd78P  
{ tTy!o=  
 // TODO: add construction code here, T]De{nHu  
 // Place all significant initialization in InitInstance R'k `0  
} vTK%4=|1}!  
~#sD2b` 0  
CHookApp theApp; /aI@2]|~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) B-MS@ <2  
{ &u2;S?7m  
 BOOL bProcessed=FALSE; ]eKuR"ob0  
 if(HC_ACTION==nCode) uCDe>Q4@/  
 { uvbVb"\"Yk  
  if((lParam&0xc0000000)==0xc0000000){// Key up r%.k,FzGZY  
   switch(wParam) ['IH*gi  
   { 7 ~~ug  
    case VK_MENU:  O`@Nl  
     MaskBits&=~ALTBIT; @ b!]Jw  
     break; ]@#9B>v=  
    case VK_CONTROL: tP@NQCo  
     MaskBits&=~CTRLBIT; D.a>i?W  
     break; y0d=  
    case VK_SHIFT: #hxYB  
     MaskBits&=~SHIFTBIT;  g{Hgs  
     break; kEDpF26!  
    default: //judge the key and send message _eKO:Y[e  
     break; *]]Zpa6  
   } spV7\Gs.@  
   for(int index=0;index<MAX_KEY;index++){ j L|6i-?!  
    if(hCallWnd[index]==NULL) .g8*K "  
     continue; n5$#M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z~J]I|R:  
    { hTtn /j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ai_ve[A  
     bProcessed=TRUE; zKd@Ab  
    } FH=2, "A  
   } KW .4 9  
  } aJ+V]WmA  
  else if((lParam&0xc000ffff)==1){ //Key down 3YvKHn|V"  
   switch(wParam) v$]B;;[A  
   { O-(V`BZe  
    case VK_MENU: 0nb%+],pX  
     MaskBits|=ALTBIT; nQiZ6[L  
     break; w5%Yi {  
    case VK_CONTROL: D~C'1C&W  
     MaskBits|=CTRLBIT; ab6I*DbF  
     break; [J,.?'V  
    case VK_SHIFT: zS%XmS\  
     MaskBits|=SHIFTBIT; <F7a!$zQ  
     break; \4N8-GwZQ  
    default: //judge the key and send message )pHtsd.eP  
     break; g6,DBkv2  
   } O&l4/RtQ\)  
   for(int index=0;index<MAX_KEY;index++) l!tR<$|  
   { M6g8+sio  
    if(hCallWnd[index]==NULL) 1@|+l!rYF  
     continue; A8m06  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  pQiC#4b  
    { 7X>IS#W]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X!]v4ma`  
     bProcessed=TRUE; u}5CzV`  
    } hP"2X"kz&  
   } &D<R;>iI  
  } ;XN|dq  
  if(!bProcessed){ Af _4Z]F  
   for(int index=0;index<MAX_KEY;index++){  QHNyH  
    if(hCallWnd[index]==NULL) Tc^ 0W=h  
     continue; :F:1(FDP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?h}NL5a  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); RDdnOzx  
   } GL n M1  
  } :c/54Ss~  
 } |&#N&t  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2z-Nw <bA  
} :{%[6lE^G  
4zyQ"?A~  
BOOL InitHotkey() B\Nbt!Ps  
{ _*o <<C\E  
 if(hHook!=NULL){ >5FTB e[D  
  nHookCount++; 'I$FOH   
  return TRUE; 8US#SI'x  
 } nj s:  
 else t%}<S~"  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); .iy4 (P4  
  if(hHook!=NULL) H,(vTthd  
   nHookCount++; `Z;Z^c  
  return (hHook!=NULL); q A .9X4NQ  
} NxHUOPAJc  
BOOL UnInit() /yI4;:/  
{ O*~,L6# }  
 if(nHookCount>1){ =|?`5!A  
  nHookCount--; #^T`vTD-  
  return TRUE; wMVUTm  
 } zH]oAu=H  
 BOOL unhooked = UnhookWindowsHookEx(hHook); KfiSQ!{  
 if(unhooked==TRUE){ &>\;4E.O5  
  nHookCount=0; pCE GZV,d@  
  hHook=NULL; `58%&3lp  
 } +?*;#=q  
 return unhooked; W![K#r5T  
} E f\|3D_  
KqG b+N-@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h*fN]k6  
{ *Ypn@YpSp  
 BOOL bAdded=FALSE; _KM? ?&  
 for(int index=0;index<MAX_KEY;index++){ ]d1'5F][H  
  if(hCallWnd[index]==0){ Ih.+-!w  
   hCallWnd[index]=hWnd; 0"R>:f}  
   HotKey[index]=cKey; B'yjMY![  
   HotKeyMask[index]=cMask; M {jXo%C  
   bAdded=TRUE; M_E,pg=rWI  
   KeyCount++; H,% bKl#  
   break; (%B{=w}8  
  } _pTcSp 3  
 } Jw]!x1rF~  
 return bAdded; !,`'VQw$  
} T1d@=&0"  
)V1xL_hx/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )k(K/m  
{ F+hV'{|w`  
 BOOL bRemoved=FALSE; 6\7c:  
 for(int index=0;index<MAX_KEY;index++){ FsED9+/m  
  if(hCallWnd[index]==hWnd){ PLz{EQ[cV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hQ|mow@Zmz  
    hCallWnd[index]=NULL; }+!"mJx@  
    HotKey[index]=0; IH`Q=Pj  
    HotKeyMask[index]=0; Cu+p!hV  
    bRemoved=TRUE; @6 "MhF  
    KeyCount--; Ge2Klyi  
    break; TDo)8+.2 z  
   } ZH Q?{"  
  } )Eozo4~  
 } 0T`Qoo>u  
 return bRemoved; -YQh F;/  
} T ~xVHk1  
2'fd4 rE5  
void VerifyWindow() +^BTh rB  
{ 8w:ay,=  
 for(int i=0;i<MAX_KEY;i++){ ~<_#%R!  
  if(hCallWnd!=NULL){ cP?GRMX@}  
   if(!IsWindow(hCallWnd)){ @}q, ';H7  
    hCallWnd=NULL; PlB3"{}0Q  
    HotKey=0; ZjxF@`H  
    HotKeyMask=0;  LgF?1?  
    KeyCount--; Nw. )O  
   } &4OJJ9S  
  } b:S$oE  
 } T:Cq}4k<  
} p7YYAh@x\  
.!4'Y}  
BOOL CHookApp::InitInstance() 2Z{?3mAb;  
{ `<tRfl}qs  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); h{)m}"n<R  
 hins=AfxGetInstanceHandle(); zLl-{Kk  
 InitHotkey(); ]|3hK/  
 return CWinApp::InitInstance(); U '{PpZ  
} o+|>D&CW%  
[k 7HLn)  
int CHookApp::ExitInstance() sK%b16#  
{ Vs"b  
 VerifyWindow(); HB )+.e  
 UnInit(); ]C^ #)7  
 return CWinApp::ExitInstance(); XuP%/\  
} 4S42h_9  
=Z.0-C>W  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {m U%.5  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) W7!Rf7TK  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Py*WHHO  
#if _MSC_VER > 1000 eztK`_n  
#pragma once 2(d  
#endif // _MSC_VER > 1000 T}!9T!(HdF  
q&:7R .Ci  
class CCaptureDlg : public CDialog BZ\="N#f  
{ ZW?h\0Hh  
 // Construction d>Tv?'o`q  
 public: q!W,2xqZoq  
  BOOL bTray; \Hb!<mrp  
  BOOL bRegistered; :NLY;B`  
  BOOL RegisterHotkey(); .J-k^+-  
  UCHAR cKey; N%Bl+7,q  
  UCHAR cMask; NzZ(N z5  
  void DeleteIcon(); ,xU#uyB  
  void AddIcon(); -|'@ :cIZ  
  UINT nCount; :'r* 5EX  
  void SaveBmp(); &7'=t6  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor i@:^b_  
  // Dialog Data JX'}+.\  
  //{{AFX_DATA(CCaptureDlg) J-+mdA  
  enum { IDD = IDD_CAPTURE_DIALOG }; X#T|.mCdC  
  CComboBox m_Key; Jm , :6T  
  BOOL m_bControl; 1a9' *[  
  BOOL m_bAlt; -)%\$z  
  BOOL m_bShift; Sck!w 3  
  CString m_Path; 6Zpa[,gm  
  CString m_Number; W.4R+kF<  
  //}}AFX_DATA P_b5`e0O  
  // ClassWizard generated virtual function overrides iAe"oXK|  
  //{{AFX_VIRTUAL(CCaptureDlg) y a$yRsd`  
 public: \@PMj"p|:  
  virtual BOOL PreTranslateMessage(MSG* pMsg); JAHmmNlW  
 protected: ]+G\1SN~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nGGw(6c%>  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); P [aE3Felk  
  //}}AFX_VIRTUAL )*%uG{h  
  // Implementation 4r;le5@  
 protected: iOm&(2/  
  HICON m_hIcon; \u.5 _ g  
  // Generated message map functions 8]&Fu3M^  
  //{{AFX_MSG(CCaptureDlg) b w1s?_P  
  virtual BOOL OnInitDialog(); bBINjs8C_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); o?O ZsA  
  afx_msg void OnPaint(); #}.{|'L  
  afx_msg HCURSOR OnQueryDragIcon(); .\H-?6R^  
  virtual void OnCancel(); 8r}tf3xMCM  
  afx_msg void OnAbout(); &pl)E$Y  
  afx_msg void OnBrowse(); ]l }v  
  afx_msg void OnChange(); ;xq;c\N  
 //}}AFX_MSG 0R unex[  
 DECLARE_MESSAGE_MAP() MuO(%.H  
}; B_#M)d O  
#endif qKXg'1#E)  
Y<^Or  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  l  
#include "stdafx.h" ?b d&Av  
#include "Capture.h" 4Tuh]5  
#include "CaptureDlg.h" ?`vGpi~  
#include <windowsx.h> D0\*WK$  
#pragma comment(lib,"hook.lib") [)}`w;#  
#ifdef _DEBUG :V"e+I  
#define new DEBUG_NEW W SvhC  
#undef THIS_FILE "pX|?ap  
static char THIS_FILE[] = __FILE__; ci%$So 2#  
#endif -= c&K&  
#define IDM_SHELL WM_USER+1 NWwKp?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %b pQ=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Hj-n 'XZ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; PtPx(R3  
class CAboutDlg : public CDialog !*^+7M  
{ aa]|  
 public: Lz9|"F"V  
  CAboutDlg(); &iuMB0rbu  
  // Dialog Data -iy17$  
  //{{AFX_DATA(CAboutDlg) ! .Pbbs%  
  enum { IDD = IDD_ABOUTBOX }; *` -  
  //}}AFX_DATA Yh,,(V6  
  // ClassWizard generated virtual function overrides &6GW9pl[  
  //{{AFX_VIRTUAL(CAboutDlg) m{*_%tjN0  
 protected: iMYJVB=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ) fuAdG  
  //}}AFX_VIRTUAL abe5 As r  
  // Implementation  ^~B#r#  
 protected: A;xH{vo{  
  //{{AFX_MSG(CAboutDlg) ;[C_ho  
  //}}AFX_MSG BN`tiPNEp  
  DECLARE_MESSAGE_MAP() G #$r)S  
}; N+UBXhh  
nFwg pT  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) w$qdV,s 7  
{ Fyz1LOH[X  
 //{{AFX_DATA_INIT(CAboutDlg) HlxgJw~<  
 //}}AFX_DATA_INIT !{r@ H+Kf  
} it j&L <e  
H8Ra!FW@  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) rb.:(d)T  
{ fn//j7 j  
 CDialog::DoDataExchange(pDX); #cl|5jm+m#  
 //{{AFX_DATA_MAP(CAboutDlg) :2t?0YR  
 //}}AFX_DATA_MAP 1OFrxSg  
} R,hwn2@B  
K?S5C8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) RLh%Y>w  
 //{{AFX_MSG_MAP(CAboutDlg) b5 AP{ #  
 // No message handlers :Mu]* N  
 //}}AFX_MSG_MAP !&G& ~*.x  
END_MESSAGE_MAP() )P W Zc?M  
P#KT lH  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) St3/mDtH  
: CDialog(CCaptureDlg::IDD, pParent) pr \OjpvD  
{ G7#<Jo<8  
 //{{AFX_DATA_INIT(CCaptureDlg) mj& 4FQ#O*  
  m_bControl = FALSE; ,Igd<A=  
  m_bAlt = FALSE; ! M7727  
  m_bShift = FALSE; 2reQd47  
  m_Path = _T("c:\\"); F PAj}as  
  m_Number = _T("0 picture captured."); DoEN`K\U  
  nCount=0; GZiN&}5e  
  bRegistered=FALSE; > 8!9  
  bTray=FALSE; Qv;^nj{\qV  
 //}}AFX_DATA_INIT d r=h;[Q'  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ' '|R$9\@  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /n9,XD&)  
} 4:s!mHcz  
4^w`] m  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 78zwu<ET  
{ mk`#\=GE  
 CDialog::DoDataExchange(pDX); $gcC}tX  
 //{{AFX_DATA_MAP(CCaptureDlg) Hc-68]T  
  DDX_Control(pDX, IDC_KEY, m_Key); fXx !_Z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); G8 CM  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Q[%+y.  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); FHyyZ{"  
  DDX_Text(pDX, IDC_PATH, m_Path); m@c\<-P  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Cbr>\;sc2Z  
 //}}AFX_DATA_MAP *46hw(L  
} K1|xatx1V  
6  8a  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 7,D6RP(b  
//{{AFX_MSG_MAP(CCaptureDlg) FJ V!B&  
 ON_WM_SYSCOMMAND() .5YW >PV  
 ON_WM_PAINT() 8CGjI?j  
 ON_WM_QUERYDRAGICON() v?#W/].C+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ~i9'9PHX@  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /-C6I:  
 ON_BN_CLICKED(ID_CHANGE, OnChange)  5wy3C  
//}}AFX_MSG_MAP +J(@.  
END_MESSAGE_MAP() L=-v>YL+  
#BwkbOgr  
BOOL CCaptureDlg::OnInitDialog() {-e|x&-  
{ ~g|z7o  
 CDialog::OnInitDialog(); ^@AIXBe  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); U=\!`_f':  
 ASSERT(IDM_ABOUTBOX < 0xF000); <(dg^;  
 CMenu* pSysMenu = GetSystemMenu(FALSE); LRmH@-qP  
 if (pSysMenu != NULL) Jhr3[A  
 { f-l(H="e  
  CString strAboutMenu; z+qrsT/?L  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~{gV`nm=J  
  if (!strAboutMenu.IsEmpty()) D eM/B5qw  
  { .l ufE  
   pSysMenu->AppendMenu(MF_SEPARATOR); )U u! x6  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Pa\"l'!>^  
  } Ld:U~M-  
 } _';oT*#  
 SetIcon(m_hIcon, TRUE); // Set big icon Tn 3<cO7v  
 SetIcon(m_hIcon, FALSE); // Set small icon B|6_4ry0U  
 m_Key.SetCurSel(0); -jQM h  
 RegisterHotkey(); U8R*i7  
 CMenu* pMenu=GetSystemMenu(FALSE); 3YOYlb %j  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )l"py9STF  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); t7qY!S (  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4n, >EA85  
 return TRUE; // return TRUE unless you set the focus to a control ubQZTAx  
} {S5H H"  
*B1%-  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 7c aV-8:  
{ x72T5.  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) M7g6m  
 { %[H|3  
  CAboutDlg dlgAbout; kB $?A8Olu  
  dlgAbout.DoModal(); UbSAyf  
 } )r.4`5Rc  
 else Ht=h9}x"g  
 { LP- _i}Kq  
  CDialog::OnSysCommand(nID, lParam); /#xx,?~xx0  
 } 55#s/`gd)^  
} wwD?i.3  
-"MB(`  
void CCaptureDlg::OnPaint() x|`o7.  
{ Rt2<F-gY  
 if (IsIconic()) ;@l5kdZx`  
 { On4tK\l @  
  CPaintDC dc(this); // device context for painting >,)tRQS  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); N9=1<{Z  
  // Center icon in client rectangle i"J`$u  
  int cxIcon = GetSystemMetrics(SM_CXICON); 1a>TJdoa  
  int cyIcon = GetSystemMetrics(SM_CYICON); X|Z2"*;b`  
  CRect rect; p`2w\P3;)  
  GetClientRect(&rect); ^L"ENsOs  
  int x = (rect.Width() - cxIcon + 1) / 2; "-a CF  
  int y = (rect.Height() - cyIcon + 1) / 2; <9jN4hV  
  // Draw the icon B #zU'G*Y  
  dc.DrawIcon(x, y, m_hIcon); sbV {RSl  
 } $PE{}`#g  
 else sxFkpf_h  
 { \:@yfI@  
  CDialog::OnPaint();  4fa2_  
 } :#&Y  
} 0$A7"^]  
<Gkmk?x`A  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1NQstmd{  
{ ~|5B   
 return (HCURSOR) m_hIcon; S @[B?sNj  
} deVbNg8gs  
s%l`XW;v  
void CCaptureDlg::OnCancel() }Z Nyd  
{ (Ceq@eAlT  
 if(bTray) t0-)\kXcA  
  DeleteIcon(); QdtGFY4f,  
  CDialog::OnCancel(); Os>^z@x  
} L92vb zP  
a15kFun  
void CCaptureDlg::OnAbout() =LHz[dSL  
{ q6a7o=BP]  
 CAboutDlg dlg; h<I C d'!  
 dlg.DoModal(); .R5(k'g?  
} M:QM*?+)  
K! I]0!:  
void CCaptureDlg::OnBrowse() ,ctm;T1H+  
{ 5KIlU78  
 CString str; Cr#Z.  
 BROWSEINFO bi; Kp)H>~cL  
 char name[MAX_PATH]; .Qz412  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); |fhYft  
 bi.hwndOwner=GetSafeHwnd(); fNnX{Wq  
 bi.pszDisplayName=name; V4>qR{5  
 bi.lpszTitle="Select folder"; W&`{3L  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; k^C^.[?  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ll8Zo+-[  
 if(idl==NULL) (dgBI}Za  
  return; F\IJim-Rh  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (`me}8  
 str.ReleaseBuffer(); 09L"~:rg  
 m_Path=str; yZcnky  
 if(str.GetAt(str.GetLength()-1)!='\\') bji^b@ us_  
  m_Path+="\\"; Wi%e9r{hU  
 UpdateData(FALSE); 6#za\[  
} tTcff9ee  
q88;{?T1  
void CCaptureDlg::SaveBmp() SL ) ope  
{ ;VW->i a6  
 CDC dc; <7 R+p;y  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8 LH\a.>  
 CBitmap bm; Cyu= c1D;  
 int Width=GetSystemMetrics(SM_CXSCREEN); N6UPD11}6  
 int Height=GetSystemMetrics(SM_CYSCREEN); >pRC$'Usx  
 bm.CreateCompatibleBitmap(&dc,Width,Height); jhF&   
 CDC tdc; & @rXt!  
 tdc.CreateCompatibleDC(&dc); B57MzIZi]  
 CBitmap*pOld=tdc.SelectObject(&bm); xixdv{M<FF  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2.PZtl  
 tdc.SelectObject(pOld); _6!@>`u~  
 BITMAP btm; ScCA8JgY  
 bm.GetBitmap(&btm); <TQ,7M4X  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; c%x9.s<+1  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,6AnuA  
 BITMAPINFOHEADER bih; @/f'i9?oM`  
 bih.biBitCount=btm.bmBitsPixel; /{71JqFis  
 bih.biClrImportant=0; -XNawpl`  
 bih.biClrUsed=0; _-c1" Kl  
 bih.biCompression=0; MR3\7D+9y  
 bih.biHeight=btm.bmHeight; 7GG:1:2+>  
 bih.biPlanes=1; +L U.QI'  
 bih.biSize=sizeof(BITMAPINFOHEADER); YHQvx_0yP  
 bih.biSizeImage=size; >_'0 s  
 bih.biWidth=btm.bmWidth; /C\tJs  
 bih.biXPelsPerMeter=0; ~`c(7  
 bih.biYPelsPerMeter=0; ?(R !BB  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =V>inH  
 static int filecount=0; )1, U~+JFU  
 CString name; wT>~7$=L{  
 name.Format("pict%04d.bmp",filecount++); ec3zoKtV  
 name=m_Path+name; `W9~u: F  
 BITMAPFILEHEADER bfh; f(UB$^4  
 bfh.bfReserved1=bfh.bfReserved2=0; Hn sPXF'8g  
 bfh.bfType=((WORD)('M'<< 8)|'B');  "[ #.  
 bfh.bfSize=54+size; $eiW2@  
 bfh.bfOffBits=54; !=bGU=^  
 CFile bf; u ?7^+z  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =)YDjd_=z  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); VKMgcfbHr/  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1EAQ ~S!2  
  bf.WriteHuge(lpData,size); 8Ao-m38  
  bf.Close(); 7xh91EU:4  
  nCount++; <IO@Qj1*  
 } FxdWJ|rN9D  
 GlobalFreePtr(lpData); 9 .18E(-  
 if(nCount==1) 51gSbkVX  
  m_Number.Format("%d picture captured.",nCount); rd1EA|T  
 else Hj97&C{Q^  
  m_Number.Format("%d pictures captured.",nCount); \N[2-;[3  
  UpdateData(FALSE); K,5_{pj  
} ?*L{xNC#  
Plj>+XRO  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) XImX1GH  
{ j.kv!;Rj=  
 if(pMsg -> message == WM_KEYDOWN) p1!-|Sqq  
 { D%~"]WnZ\Q  
  if(pMsg -> wParam == VK_ESCAPE) sv)4e)1  
   return TRUE; L Z}m;  
  if(pMsg -> wParam == VK_RETURN) h!J|4Q a  
   return TRUE; 7* R %zJ  
 } tSVU,m  
 return CDialog::PreTranslateMessage(pMsg);  {HbSty  
} IC:>60A,]  
G#YBfPmr  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ia j`u  
{ h{ T{3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ oq9gFJG(  
  SaveBmp();  N<~LgH  
  return FALSE; =wznkqyhi  
} B|ctauJ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p]rV\,Yss  
 CMenu pop; 3?Fe( !@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); -,q qQf  
 CMenu*pMenu=pop.GetSubMenu(0); sL)7MtNwy  
 pMenu->SetDefaultItem(ID_EXITICON); }CM#jN?(  
 CPoint pt; %$'Z"njO&  
 GetCursorPos(&pt); @k9n0Qe|F  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); KEjMxOv1  
 if(id==ID_EXITICON) 8Om4G]*|,  
  DeleteIcon(); PIHKSAnq  
 else if(id==ID_EXIT) [&pMU)   
  OnCancel(); _'Rg7zHTp-  
 return FALSE; } 8[  
} M^{=&  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xg;vQKS6  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /h 4rW>8D2  
 AddIcon(); yp]z@SYA@  
 return res; L cTTfb+<  
} ]JQ}9"p=5  
=g|5VXW5  
void CCaptureDlg::AddIcon() {hoe^07XK  
{ 5a|{ytP   
 NOTIFYICONDATA data; @$1jp4c   
 data.cbSize=sizeof(NOTIFYICONDATA); V;"Rp-`^  
 CString tip; { g4`>^;  
 tip.LoadString(IDS_ICONTIP); pP%9MSCi  
 data.hIcon=GetIcon(0); nd"$gi  
 data.hWnd=GetSafeHwnd(); w\a6ga!xt"  
 strcpy(data.szTip,tip); =w7+Yt  
 data.uCallbackMessage=IDM_SHELL; vr4{|5M  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; xAr&sGMA  
 data.uID=98; NInZ~4:  
 Shell_NotifyIcon(NIM_ADD,&data); p\Fxt1Y@X  
 ShowWindow(SW_HIDE); _k#!^AJ}x  
 bTray=TRUE;  S8O,{  
} Ec&_&  
B & ]GGy  
void CCaptureDlg::DeleteIcon() 0nZQ" {x  
{ ,I H~  
 NOTIFYICONDATA data; k\Y*tY#2  
 data.cbSize=sizeof(NOTIFYICONDATA); : . PRM+  
 data.hWnd=GetSafeHwnd(); XB]>Z)  
 data.uID=98; ,z#S=I  
 Shell_NotifyIcon(NIM_DELETE,&data); Cx&l0ZXHEX  
 ShowWindow(SW_SHOW); yIg^iZD  
 SetForegroundWindow(); h-\Ov{~  
 ShowWindow(SW_SHOWNORMAL); 7bQST0 ?  
 bTray=FALSE; qL5~Wr m-W  
} `A<2wd;  
, [<$X{9  
void CCaptureDlg::OnChange() zm3$)*p1  
{ S R s  
 RegisterHotkey(); vy-q<6T}:p  
} rdsZ[ii  
i:Gyi([C  
BOOL CCaptureDlg::RegisterHotkey() BS%pS(  
{ LtPaTe  
 UpdateData(); Rh%@N.Z*  
 UCHAR mask=0; ^fE8|/]nG9  
 UCHAR key=0; @}pcj2K#  
 if(m_bControl) ;]k\F  
  mask|=4; $4Dr +Z H  
 if(m_bAlt) Jp= )L  
  mask|=2; Vi>P =i  
 if(m_bShift) 4'td6F  
  mask|=1; 53>(2 _/[r  
  key=Key_Table[m_Key.GetCurSel()]; *BvdL:t  
 if(bRegistered){ {^k7}`7,  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5s@xpWVot  
  bRegistered=FALSE; RK p9[^/?  
 } WJ,?5#  
 cMask=mask; p)VMYu  
 cKey=key; O:ACp<@  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); O* lE0~rJ  
 return bRegistered; v]rbm}uU9  
} (M<l}pl)  
cj[x%eK>  
  四、小结 y6Ez.$M  
dKhS;!K9p  
  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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