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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: :-~x~ah-  
  9g7Ok9dF  
  一、实现方法 8KWhXF  
|`Be(  
  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: qG0gc\C}  
c3Zwp%  
#pragma data_seg("shareddata") RY*yj&?w [  
HHOOK hHook =NULL; //钩子句柄 e r"gPW  
UINT nHookCount =0; //挂接的程序数目 `3.bux~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 d4o_/[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 fa,;Sw  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~TjTd  
static int KeyCount =0; c}w[ T  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 [yVcH3GcjI  
#pragma data_seg() <n0j'P>1  
:KsBJ>2ck  
  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。 kS_3 7-;  
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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: X iM{YZ`B  
:U-yO 9!j  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR uN6xOq/  
cKey,UCHAR cMask) |2&|#K4k^  
{ BA_l*h%=Cc  
 BOOL bAdded=FALSE; uU1q?|4  
 for(int index=0;index<MAX_KEY;index++){ BF U#FE)s  
  if(hCallWnd[index]==0){ >2tosxH M  
   hCallWnd[index]=hWnd; Rr>""  
   HotKey[index]=cKey; _? u} Jy_  
   HotKeyMask[index]=cMask; N}q*(r!q<  
   bAdded=TRUE; r8!M8Sc  
   KeyCount++; /P*ph0S-  
   break; #M92=IH  
  } qb5IpI{U  
 } #e6x_o|  
 return bAdded; >u=nGeO  
} k_1o j[O  
//删除热键 #DcK{|ty  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) cQh=Mri]  
{ s$VLVT*6  
 BOOL bRemoved=FALSE; /(bn+l}W  
 for(int index=0;index<MAX_KEY;index++){ qGie~S ##  
  if(hCallWnd[index]==hWnd){ e3kdIOu5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ IE&G7\>(yO  
    hCallWnd[index]=NULL; Zh_ P  
    HotKey[index]=0; < !]7Gt  
    HotKeyMask[index]=0; AI2>{V  
    bRemoved=TRUE; BF]+fs`  
    KeyCount--; UFUm-~x`  
    break; G_?qY#"(  
   } 'deqF|Iox  
  } Dz+R Q`Vn  
 } <(Ktf0'__  
 return bRemoved; j,#R?Ig  
} dH0wVI<z  
RTTEAh:.  
'w}/ o+x@  
  DLL中的钩子函数如下: &qZ:"k  
@fSqGsSk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,YmTx  
{ [R Hji47  
 BOOL bProcessed=FALSE; YCNpJGM  
 if(HC_ACTION==nCode) ,y/N^^\  
 { H/Ov8|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }C&kzJBEF  
   switch(wParam) .gd'<l  
   {  ZAMS;e+e  
    case VK_MENU: SL>0_  
     MaskBits&=~ALTBIT; O)G^VD s  
     break; U+g<lgH1J  
    case VK_CONTROL: vjD||!g'  
     MaskBits&=~CTRLBIT; on0>_-n)  
     break; a5%IjgQ&z  
    case VK_SHIFT: T8a!"lPP7  
     MaskBits&=~SHIFTBIT; (1Ii86EP  
     break; R~(_m#6`:  
    default: //judge the key and send message uJ/ &!q<3  
     break; 5K?%Eo72!=  
   } +)TOcxF%  
   for(int index=0;index<MAX_KEY;index++){ o^~KAB7  
    if(hCallWnd[index]==NULL) Le}-F{~`^  
     continue; X3rvM8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O.+X,CQG*  
    { 04R-}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); aD8r:S\  
     bProcessed=TRUE; x)o`w"]al  
    } =%oKYQ  
   } j0[9Cj^%c  
  } RDQK_Ef:  
  else if((lParam&0xc000ffff)==1){ //有键按下 A+F@JpV  
   switch(wParam) 8Wyv!tL  
   { I;Bcim;  
    case VK_MENU: OAtn.LU  
     MaskBits|=ALTBIT; Tta+qjr  
     break; @60/IE{-v  
    case VK_CONTROL: _M7NL^B&  
     MaskBits|=CTRLBIT; wmG[*a_H  
     break; -pm^k-%v  
    case VK_SHIFT: FBJ Lkg0  
     MaskBits|=SHIFTBIT; Po82nKAh  
     break; 5R7DD5c[  
    default: //judge the key and send message _ ?Z :m  
     break; *Ldno`1O  
   } yTL<S'  
   for(int index=0;index<MAX_KEY;index++){ NKb,>TO  
    if(hCallWnd[index]==NULL) Qz/1^xy  
     continue; eLAhfG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~eHu +pv  
    { 8?&u5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .m\'|%  
     bProcessed=TRUE; En/EQ\T@F  
    } /*5lO;!s{  
   } Se-n#  
  } "#a,R ^J  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 >0qe*4n|M  
   for(int index=0;index<MAX_KEY;index++){ iu 6NIy7D  
    if(hCallWnd[index]==NULL) . 'rC'FT  
     continue; SV96eYT<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) O<?z\yBtS^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,\n%e'  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 A&6qt  
   } C| Vz `FY  
  } |cUBS)[)X  
 } iZ-"l3) D  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ZJ|'$=lR  
} > H(o=39s  
AjA.="3  
  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: DQOEntw  
",qJG]_ <  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9n[ovX 7n!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s0x;<si_  
w>ap8><4  
  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: !*l5%H  
Sx3R 2-!Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Qcf5* ]V  
{ )j>BvO  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 11 >K\"K}  
 { CA{(x(W\:  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 COf>H0^%Q  
  SaveBmp(); nJ-U*yz  
  return FALSE; x#_0 6  
 } B`SHr"k!V[  
 …… //其它处理及默认处理 coQ>CbHg  
} THbV],RhJ  
N^{+1u7  
d]6#pSE  
  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。 I,xV&j+<  
|}>;wZ[7  
  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。 +Tw]u`  
J< U,~ra\  
  二、编程步骤 $pg1Av7l  
yl[6b1  
  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"; sjj*7i*  
e2PM^1{_  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; `vPc&.-K  
u9}k^W)E  
  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; 'P^6H$0  
<>FpvdB  
  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; ;,yjkD[mWE  
_ X* A  
  5、 添加代码,编译运行程序。 x#{.mN  
R2[-Q"|Ra  
三、程序代码 Ev7fvz =  
.j)f'<;%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Ce0YO~I  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) *U=%W4?W  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ D,H v(6({  
#if _MSC_VER > 1000 qOk=:1`3  
#pragma once 3'zm)SXJ  
#endif // _MSC_VER > 1000 9AsK=/Buf  
#ifndef __AFXWIN_H__ r g$2)z1  
#error include 'stdafx.h' before including this file for PCH +/E yX =  
#endif UoiXIf_Q  
#include "resource.h" // main symbols 8#MiM . f  
class CHookApp : public CWinApp 3M[b)At V.  
{ a!US:^}lu  
 public: <x|P}  
  CHookApp(); _#8OHG.x  
  // Overrides p7pJ90~E  
  // ClassWizard generated virtual function overrides (wRJ"Nwu  
  //{{AFX_VIRTUAL(CHookApp) &gL &@';,  
 public: \)Bws `  
  virtual BOOL InitInstance(); 5/),HGxi  
  virtual int ExitInstance(); FX#fh 2  
  //}}AFX_VIRTUAL #AJo75E%  
  //{{AFX_MSG(CHookApp) ny]R,D0  
  // NOTE - the ClassWizard will add and remove member functions here. n(MVm-H  
  // DO NOT EDIT what you see in these blocks of generated code ! /.u0rxoRP}  
  //}}AFX_MSG "/zIsn7  
  DECLARE_MESSAGE_MAP() =#"ZO  
}; pGO)9?j_N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Dr!g$,9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?U`~,oI0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dlx "L%  
BOOL InitHotkey(); UpU2H4  
BOOL UnInit(); Iw<: k  
#endif dk^Uf84.Gr  
7O,y%NWaK  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. }RvP*i  
#include "stdafx.h" oe8sixZ[  
#include "hook.h" L/VlmN_v>s  
#include <windowsx.h> ^U`Bj*"2  
#ifdef _DEBUG [;F%6MPK^  
#define new DEBUG_NEW -W:te7  
#undef THIS_FILE n!B*n(;!u  
static char THIS_FILE[] = __FILE__; H^c8r^#  
#endif AMhHq/Dw  
#define MAX_KEY 100 / ao|v  
#define CTRLBIT 0x04 !Deg!f\g  
#define ALTBIT 0x02 }op0`-Xb  
#define SHIFTBIT 0x01 yR Zb_Mq9U  
#pragma data_seg("shareddata") tC,R^${#  
HHOOK hHook =NULL; 5IPZ;  
UINT nHookCount =0; !Cpy )D(  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey vThK@P!s  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT O7_u9lz2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey o"Dk`L2  
static int KeyCount =0; 2)A% 'Akf  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 4[ 7) $  
#pragma data_seg() K6=i\   
HINSTANCE hins; <=D\Ckmb  
void VerifyWindow(); 5)rMoYn25  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) #xMl<  
//{{AFX_MSG_MAP(CHookApp)  / >Z`?  
// NOTE - the ClassWizard will add and remove mapping macros here. avb'J^}f  
// DO NOT EDIT what you see in these blocks of generated code! BP6|^Q  
//}}AFX_MSG_MAP k-$5H~(PZ  
END_MESSAGE_MAP() LtxeT .  
vt`V<3  
CHookApp::CHookApp() \=O['#  
{ Y'YvVI  
 // TODO: add construction code here, i7D)'4gkW  
 // Place all significant initialization in InitInstance <R TAO2  
} LB1AjNJ  
YQ&Ww|xe  
CHookApp theApp; ^11y8[[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R<J1bH1n3  
{ vCf{k  
 BOOL bProcessed=FALSE; I,*zZNv Ri  
 if(HC_ACTION==nCode) ;PO{ ips  
 { c==5cMUg  
  if((lParam&0xc0000000)==0xc0000000){// Key up ne=?'e4  
   switch(wParam) _NfdJ=[Xh  
   { &X^ -|7~N  
    case VK_MENU: /YP,Wfd%  
     MaskBits&=~ALTBIT; {xFgPtCM  
     break; zT\nj&7  
    case VK_CONTROL: <Be:fnPX7  
     MaskBits&=~CTRLBIT; (V:z7  
     break; )<?^~"h  
    case VK_SHIFT: 5d7AE^SHsH  
     MaskBits&=~SHIFTBIT; V!Px975P  
     break; -A?6)ggf.  
    default: //judge the key and send message xp!M A  
     break; &DX&*Xq2  
   } aDV~T24  
   for(int index=0;index<MAX_KEY;index++){ )O xsasn)M  
    if(hCallWnd[index]==NULL) p f\ Ybbs  
     continue; W:s>?(6?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~]MACG:'  
    { cN#c25S>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 59Lv/Mfy  
     bProcessed=TRUE; Dsl,(qm5  
    } qHZ!~Kq,"'  
   } ^ZxT0oaL  
  } r9nyEzk  
  else if((lParam&0xc000ffff)==1){ //Key down " vW4"R6  
   switch(wParam) ZU=om Rh5  
   { xppl6v(  
    case VK_MENU: BwLggo  
     MaskBits|=ALTBIT; @>r3=s.Q  
     break; gQ < >S  
    case VK_CONTROL: o =oXL2}  
     MaskBits|=CTRLBIT; S,ENbP%0r  
     break; ~HFqAOr  
    case VK_SHIFT: ;;^OKrzWW  
     MaskBits|=SHIFTBIT; m W/6FC  
     break; Hwz.5hV"  
    default: //judge the key and send message eHQS\n  
     break; q X"Pg  
   } qhdY<[6  
   for(int index=0;index<MAX_KEY;index++) FZt a  
   { d@$]/=%  
    if(hCallWnd[index]==NULL) N;YAG#'9~_  
     continue; eK=W'cNu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y#VtZTcT  
    { eWN[EJI<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); GOKca%DT=  
     bProcessed=TRUE; }{R?i,j(  
    } >@Nn_d  
   } UJ/=RBfkJ  
  } wWVLwp4-  
  if(!bProcessed){ F}f/cG<X  
   for(int index=0;index<MAX_KEY;index++){ jkVX>*.|oy  
    if(hCallWnd[index]==NULL) K&Sz8# +  
     continue; _Q**4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) g< F7UA  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &>@  
   } C[-M ~yIL  
  } "^Ax}Jr  
 } 'lsG?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); L[D<e?j  
} wWI1%#__|o  
e5}KzFZmZ  
BOOL InitHotkey() IO@Ti(,  
{ &y} ]^wB  
 if(hHook!=NULL){ z]twh&^1L  
  nHookCount++; TtWE:xE  
  return TRUE; 6h5,XcO4  
 } 0b)q,]l]  
 else {:63% j  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); <>Nq ]WqA  
  if(hHook!=NULL) ?o D]J  
   nHookCount++; mRECd Gst  
  return (hHook!=NULL); 6EX_IDb  
} N wISf  
BOOL UnInit() i$z).S?1  
{ hhM?I$t:  
 if(nHookCount>1){ /c&;WlE/n  
  nHookCount--; "PK`Ca@`v  
  return TRUE; |z+K]R8_  
 } <`f~Z|/-_(  
 BOOL unhooked = UnhookWindowsHookEx(hHook); oEuV&m|yX  
 if(unhooked==TRUE){ :L6,=#  
  nHookCount=0; j><8V Qx  
  hHook=NULL; b9%G"?~Zz  
 } M[= #%U3*N  
 return unhooked; 3d>3f3D8;  
} e8Y;~OAj[  
<hv {,1p-r  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s"xiGp9  
{ )HL[_WfY  
 BOOL bAdded=FALSE; Mb1K:U  
 for(int index=0;index<MAX_KEY;index++){ 0dKv%X#\  
  if(hCallWnd[index]==0){ 7`G FtX}  
   hCallWnd[index]=hWnd; 4g "_E  
   HotKey[index]=cKey; zz7#g U  
   HotKeyMask[index]=cMask; gK6_vS4K)  
   bAdded=TRUE; m%p;>:"R  
   KeyCount++; pR,eus;8  
   break; D-S"?aO-  
  } 79bt%P  
 } !8Mi+ZV  
 return bAdded; 8%,u~ELA  
} u&npUw^Va  
,K-?M5(n9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B7u4e8(E*  
{ t*Xo@KA  
 BOOL bRemoved=FALSE; q=J8SvSRl  
 for(int index=0;index<MAX_KEY;index++){ 1M<;}hJ{/  
  if(hCallWnd[index]==hWnd){ ~\QN.a   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )/Mk\``j  
    hCallWnd[index]=NULL; .!^}sp,E  
    HotKey[index]=0; }Y=X{3+~.  
    HotKeyMask[index]=0; o6@`aU  
    bRemoved=TRUE; s~)I1G  
    KeyCount--; <0M 2qt8  
    break; I&s!}$cD  
   } T:G8xI1 P  
  } 3yXSv1  
 } sq;nUA=  
 return bRemoved; 4r- CF#o  
} Es^=&2 ''  
Q\qI+F2?  
void VerifyWindow() 5_yu4{@;y  
{ Z< 4Du  
 for(int i=0;i<MAX_KEY;i++){ +W}dO#  
  if(hCallWnd!=NULL){ b&_u+g  
   if(!IsWindow(hCallWnd)){ -nL!#R{e  
    hCallWnd=NULL; X[;-SXq  
    HotKey=0; d+iV19#i  
    HotKeyMask=0; S4!}7NOh  
    KeyCount--; #sJL"GB  
   } ~1g)4g~  
  } G1?m}{D)  
 } Mf_urbp]  
} *vS)aRK  
Tsc2;I  
BOOL CHookApp::InitInstance() :vWixgLg  
{ 6qYK"^+xu  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); QZ?%xN(4  
 hins=AfxGetInstanceHandle(); EA=EcUf'  
 InitHotkey(); Pgh)+>ON  
 return CWinApp::InitInstance(); kWm[Lt  
} '1NZSiv+C?  
~]S%b3>  
int CHookApp::ExitInstance() rIRkXO)  
{ s^lm 81;  
 VerifyWindow(); ^a #  
 UnInit(); C%T$l8$  
 return CWinApp::ExitInstance(); CeD(!1V G  
} v;$cx*?  
;>jLRx<KC  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #}8 x  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) [`/d$V!e  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %;-r->  
#if _MSC_VER > 1000 L`@)*x)~R  
#pragma once 71wtO  
#endif // _MSC_VER > 1000 yGZsPQIaV  
/~6)Vt  
class CCaptureDlg : public CDialog dkI(&/  
{ d:GAa   
 // Construction JM>4m)h#  
 public: >DkRl  
  BOOL bTray; U!D\Vd  
  BOOL bRegistered; !`qw" i  
  BOOL RegisterHotkey(); (|t)MnPfY  
  UCHAR cKey; <HMmsw  
  UCHAR cMask; I5H#]U  
  void DeleteIcon(); ,Z aPY  
  void AddIcon(); -s,guW |  
  UINT nCount; &O;' ?/4 S  
  void SaveBmp(); %YV3-W8S0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor m14OPZ<3?-  
  // Dialog Data ^QbaMX  
  //{{AFX_DATA(CCaptureDlg) M?G4k]  
  enum { IDD = IDD_CAPTURE_DIALOG }; Q2jl61d_9  
  CComboBox m_Key; ?<h|Q~JH  
  BOOL m_bControl; 1Uf8ef1,  
  BOOL m_bAlt; m>8tA+K)+)  
  BOOL m_bShift; 1WJ%n;  
  CString m_Path; ,mm9X\ '  
  CString m_Number; Ps=<@,dks  
  //}}AFX_DATA 0{Bhr12V  
  // ClassWizard generated virtual function overrides 6e q`/~#  
  //{{AFX_VIRTUAL(CCaptureDlg) Y V#|qb  
 public: =Xu(Js-  
  virtual BOOL PreTranslateMessage(MSG* pMsg); eczS(KoL4  
 protected: h$#zuqm  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;{S7bH'6m  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); m[E#$JZtG  
  //}}AFX_VIRTUAL y_A7CG"^  
  // Implementation NI)q<@ju  
 protected: Zrm!,qs  
  HICON m_hIcon; rwCjNky!  
  // Generated message map functions kO'_g1f<[  
  //{{AFX_MSG(CCaptureDlg) ^E|{i]j#f  
  virtual BOOL OnInitDialog(); e(~Y!:Q#O  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); \h UE, ^  
  afx_msg void OnPaint(); ; w+<yW}EL  
  afx_msg HCURSOR OnQueryDragIcon(); 4M3{P  
  virtual void OnCancel(); ,W:Bh$%  
  afx_msg void OnAbout(); K.I  \E  
  afx_msg void OnBrowse(); ^ e4y:#Nu  
  afx_msg void OnChange(); e,rCutA)  
 //}}AFX_MSG QCVwslj,K  
 DECLARE_MESSAGE_MAP() ppXt8G3% x  
}; @ 9q/jv`  
#endif A_xUP9g@?  
9!UFLZR  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ," ~4l&  
#include "stdafx.h" O({vHqN>  
#include "Capture.h" MsLQ'9%Au  
#include "CaptureDlg.h" wML5T+  
#include <windowsx.h> XJ9l, :c,  
#pragma comment(lib,"hook.lib") I15g G.)  
#ifdef _DEBUG ?KF.v1w7  
#define new DEBUG_NEW ]id5jVY  
#undef THIS_FILE GFmVR2z_+  
static char THIS_FILE[] = __FILE__; w 7Y>B`wm?  
#endif 97~*Z|#<+  
#define IDM_SHELL WM_USER+1 Ey**j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qw mZOR#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); o])2_e5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; xulwn{R s  
class CAboutDlg : public CDialog xfqW~&  
{ itmQH\9 8  
 public: F G5e{  
  CAboutDlg(); WeqQw?-  
  // Dialog Data :.%Hu9=GL  
  //{{AFX_DATA(CAboutDlg) wD'LX  
  enum { IDD = IDD_ABOUTBOX }; SYZS@o  
  //}}AFX_DATA 6yRxb (  
  // ClassWizard generated virtual function overrides W$_@9W(Bl  
  //{{AFX_VIRTUAL(CAboutDlg) f7Fr%*cO  
 protected: 4RU/y+[o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ne 9R u'B6  
  //}}AFX_VIRTUAL '.&z y#  
  // Implementation .-W_m7&}  
 protected: xs ^$fn\  
  //{{AFX_MSG(CAboutDlg) ecgGl,{  
  //}}AFX_MSG n gC|BLT%h  
  DECLARE_MESSAGE_MAP() 2 - ?  
}; *q/oS8vavd  
5Zdxn>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) h=Xr J  
{ 7<?~A6  
 //{{AFX_DATA_INIT(CAboutDlg) tzFgPeo$;  
 //}}AFX_DATA_INIT b6E,u*)"  
} B\z4o\am%  
SOPQg?'n=V  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %`Q<_LTU  
{ -A A='s  
 CDialog::DoDataExchange(pDX); j)[ w X  
 //{{AFX_DATA_MAP(CAboutDlg) R9B!F{! 5  
 //}}AFX_DATA_MAP 3"OD"  
} B U^3Ux$  
bWAVBF  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) u  teI[Q  
 //{{AFX_MSG_MAP(CAboutDlg) (&x#VmDL  
 // No message handlers K[( h2&  
 //}}AFX_MSG_MAP R0v5mD$:G  
END_MESSAGE_MAP() z9#iU>@  
1*!`G5c,}  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *0aU(E #  
: CDialog(CCaptureDlg::IDD, pParent) 6 NJ5v +  
{ !SFF 79$c  
 //{{AFX_DATA_INIT(CCaptureDlg) m+J3t @$  
  m_bControl = FALSE; !pNY`sw}  
  m_bAlt = FALSE; ZxRD+`  
  m_bShift = FALSE; Kpo{:a  
  m_Path = _T("c:\\"); =os%22*  
  m_Number = _T("0 picture captured."); e2v[ma-  
  nCount=0; J}-,!3qxW  
  bRegistered=FALSE; !a[1rQH  
  bTray=FALSE; ]zza/O;31(  
 //}}AFX_DATA_INIT ^|(w)Sy  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 liUrw7,  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); [foZO&+!  
} =O)dHY}  
ttwfWfX  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) IaU  
{ uW8LG\Z>D5  
 CDialog::DoDataExchange(pDX); [Yzh(a8  
 //{{AFX_DATA_MAP(CCaptureDlg) 6J|Y+Y$  
  DDX_Control(pDX, IDC_KEY, m_Key); 4D`T_l  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); fdD?"z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 1o;+.]B  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 5$e|@/(0  
  DDX_Text(pDX, IDC_PATH, m_Path); s C9j73 vf  
  DDX_Text(pDX, IDC_NUMBER, m_Number); .cQ<F4)!tu  
 //}}AFX_DATA_MAP tCk;tu!d  
} ">G|\_ZF  
q,JMmhWaT  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'j)xryw  
//{{AFX_MSG_MAP(CCaptureDlg) 0.~Pzg  
 ON_WM_SYSCOMMAND() w6fVZY4  
 ON_WM_PAINT() !6pOY*> j  
 ON_WM_QUERYDRAGICON() FX FTf2*T  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) xsx @aF  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) z~/z>_y$nv  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Ew=8"V`C  
//}}AFX_MSG_MAP 8/;q~:v  
END_MESSAGE_MAP() OgiElA.  
"b!EtlT9  
BOOL CCaptureDlg::OnInitDialog() NY'sZTM&  
{ (o1*7_]e  
 CDialog::OnInitDialog(); >C`b 4xQ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 1A4!zqT;  
 ASSERT(IDM_ABOUTBOX < 0xF000); K.Tfu"6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;J~NfL  
 if (pSysMenu != NULL) 1Z +3=$P  
 { z\,g %u41  
  CString strAboutMenu; g3%Xh0007{  
  strAboutMenu.LoadString(IDS_ABOUTBOX); k;w1y(  
  if (!strAboutMenu.IsEmpty()) `4RraJj>0~  
  { u6A ReL 'f  
   pSysMenu->AppendMenu(MF_SEPARATOR); IRemF@  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); <|NP!eMsw8  
  } 4ey m$UWw  
 } ?q(7avS9  
 SetIcon(m_hIcon, TRUE); // Set big icon BpL,<r,  
 SetIcon(m_hIcon, FALSE); // Set small icon t%e}'?#^  
 m_Key.SetCurSel(0); *v[WJ"8@  
 RegisterHotkey(); gv}Esps R  
 CMenu* pMenu=GetSystemMenu(FALSE); z O  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8I)66  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); c|lo%[]R!  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ; /fZh:V2  
 return TRUE; // return TRUE unless you set the focus to a control GNzk Vy:u  
} Fg)Iw<7_2  
[a;U'v*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) J~6+zBF  
{ OAMsqeWYA  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) W>Eee?  
 { #YM5P  
  CAboutDlg dlgAbout; [V~(7U  
  dlgAbout.DoModal(); /R&!92I0*  
 } y#5xS  
 else 0*MY4r|-  
 { V]cD^Fqp  
  CDialog::OnSysCommand(nID, lParam); bwG2=  
 } X !g"D6'  
} 1D03Nbh|5  
\`\& G-\  
void CCaptureDlg::OnPaint() H3Y FbR  
{ .eAN`-t;  
 if (IsIconic()) |1zoT|}q  
 { G[1:<Vg8  
  CPaintDC dc(this); // device context for painting sr+* q6W  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Q# w`ZQX3  
  // Center icon in client rectangle \WG6\Zg0A  
  int cxIcon = GetSystemMetrics(SM_CXICON); |*5Kfxq  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?(el6J}  
  CRect rect; hPa:>e  
  GetClientRect(&rect); ^uIP   
  int x = (rect.Width() - cxIcon + 1) / 2; tCAh?nR  
  int y = (rect.Height() - cyIcon + 1) / 2; k{<]J5{7  
  // Draw the icon n}MW# :eJe  
  dc.DrawIcon(x, y, m_hIcon); )-q#hY  
 } dd#=_xe  
 else >M{=qs  
 { Bb2;zOGdA  
  CDialog::OnPaint(); XBE+O7  
 } A*jU&3#  
} j:# wt70  
`9BZ))Pg  
HCURSOR CCaptureDlg::OnQueryDragIcon() V9*Z  
{ VMPBM:k G  
 return (HCURSOR) m_hIcon; nFU'DZ  
} p< i;@H;:  
@:\Iw"P  
void CCaptureDlg::OnCancel() W 86`R  
{ Tf/jd 3>  
 if(bTray) &<}vs`W  
  DeleteIcon(); ~0"(C#l 9  
  CDialog::OnCancel(); jj2 [Zh/h  
} +;uP) "Q/L  
e^)+bmh  
void CCaptureDlg::OnAbout() 1zwk0={x-%  
{ q}[g/%  
 CAboutDlg dlg; XKD0n^L[  
 dlg.DoModal(); h/E+r:2]  
} 2Fk4jHj  
od=%8z  
void CCaptureDlg::OnBrowse() !sWKi)1  
{ m20:{fld  
 CString str; hK F*{,'  
 BROWSEINFO bi; JDcc`&`M  
 char name[MAX_PATH]; e 4-  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #9-qF9M  
 bi.hwndOwner=GetSafeHwnd(); -j1?l Y  
 bi.pszDisplayName=name; Vmq:As^a  
 bi.lpszTitle="Select folder"; l"70|~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; w U".^ +  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]X y2km]  
 if(idl==NULL) q1!45a  
  return; {cmY`to  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <d89eV+  
 str.ReleaseBuffer(); XpWcf ([  
 m_Path=str; >yk@t&j,  
 if(str.GetAt(str.GetLength()-1)!='\\') w<=?%+n  
  m_Path+="\\"; -]$q8 Q(hM  
 UpdateData(FALSE); G?`{OW3:_  
} z,pKy Inw  
= F*SAz  
void CCaptureDlg::SaveBmp() WWf#in  
{ }LK +w+h~  
 CDC dc; nn[OC=cDN  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ?=zF]J:G1w  
 CBitmap bm;  A [W3.$s  
 int Width=GetSystemMetrics(SM_CXSCREEN); %d-|C.  
 int Height=GetSystemMetrics(SM_CYSCREEN); L'(ei7Z  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 7i- G5%w7  
 CDC tdc; .[mI9dc  
 tdc.CreateCompatibleDC(&dc); KrVP#|9%"  
 CBitmap*pOld=tdc.SelectObject(&bm); t&5N{C:  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); yW3!V-iA  
 tdc.SelectObject(pOld); Y:f"Zx  
 BITMAP btm;  zciL'9  
 bm.GetBitmap(&btm); %?<Y&t  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 90g=&O5@O  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >\f'QQ  
 BITMAPINFOHEADER bih; 4FwtC"G3  
 bih.biBitCount=btm.bmBitsPixel; `Vph=`0  
 bih.biClrImportant=0; CMu/n]?c  
 bih.biClrUsed=0; g$X4ZRSel  
 bih.biCompression=0; b&wyp@k  
 bih.biHeight=btm.bmHeight; KZeaM  
 bih.biPlanes=1; ^w|D^F=o  
 bih.biSize=sizeof(BITMAPINFOHEADER); }4$k-,1S  
 bih.biSizeImage=size; 'Cr2& dy  
 bih.biWidth=btm.bmWidth; w3hG\2)[HS  
 bih.biXPelsPerMeter=0; dgbqMu"  
 bih.biYPelsPerMeter=0; -hy`Np  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ^@91BY  
 static int filecount=0; Hs9; &C  
 CString name; Q[rmsk 2L'  
 name.Format("pict%04d.bmp",filecount++); JSp V2c5Q  
 name=m_Path+name; J}zN]|bz  
 BITMAPFILEHEADER bfh; \S5YS2,P  
 bfh.bfReserved1=bfh.bfReserved2=0; W20qn>{z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Qqm$Jl!  
 bfh.bfSize=54+size; 9:\#GOg  
 bfh.bfOffBits=54; P5?M"j0/^  
 CFile bf; B}?$kp  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6h5DvSO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?aMd#.&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); T)CEcz  
  bf.WriteHuge(lpData,size); 5~ip N/)E  
  bf.Close(); :"Gx  
  nCount++; {7F?30: ]  
 } GkU]>8E'"  
 GlobalFreePtr(lpData); :o37 V!  
 if(nCount==1) +cXdF  
  m_Number.Format("%d picture captured.",nCount); 1uwzo9Yg  
 else !3*:6  
  m_Number.Format("%d pictures captured.",nCount); }c]u'a!4  
  UpdateData(FALSE); pnTuYT^%)  
} vx7wW<e%D  
"a T "o  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) tKP zM  
{ oS0rP'V^  
 if(pMsg -> message == WM_KEYDOWN) ,$oz1,Q/  
 { A?zxF5rfp  
  if(pMsg -> wParam == VK_ESCAPE) w]ihGh  
   return TRUE; )@\Eibt2oH  
  if(pMsg -> wParam == VK_RETURN) ABG>W>H-S  
   return TRUE; W)LtnD2 w  
 } (R{|*:KP  
 return CDialog::PreTranslateMessage(pMsg); *K#Ci1Q  
} "e;wN3/bF  
zZE@:P&lf  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8+|7*Ud  
{ <&CzM"\Em  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ c}u`L6!I3  
  SaveBmp(); ^2f2g>9j_C  
  return FALSE; )O:T\{7+  
} P`$Y73L  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [kp#  
 CMenu pop; Yn>y1~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); TBU.%3dEyI  
 CMenu*pMenu=pop.GetSubMenu(0); 1RU+d.&D  
 pMenu->SetDefaultItem(ID_EXITICON); znq/ %7  
 CPoint pt; i_' u:P<t  
 GetCursorPos(&pt); KQu lz  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  \LP?,<  
 if(id==ID_EXITICON) 4*9WxhJ ]0  
  DeleteIcon(); @ak3ZNor  
 else if(id==ID_EXIT) 1cdX0[sN  
  OnCancel(); oMV^W^<  
 return FALSE; 4xsnN@b  
} r1]DkX <6  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); j0(+Kq:J  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) X"fSM #  
 AddIcon(); 8]2j*e0xV  
 return res; ^`f( Pg!  
} d@QC[$qXj  
|]=s  
void CCaptureDlg::AddIcon() ,\CG}-v@CN  
{ @\)a&p]a  
 NOTIFYICONDATA data; }'c@E0"  
 data.cbSize=sizeof(NOTIFYICONDATA); z@tIC^s  
 CString tip; g@s'-8}X^  
 tip.LoadString(IDS_ICONTIP); ,/1[(^e  
 data.hIcon=GetIcon(0); iosL&*'8  
 data.hWnd=GetSafeHwnd(); :G/.h[\R|  
 strcpy(data.szTip,tip); Op 0Qpn  
 data.uCallbackMessage=IDM_SHELL; W^T6^q5;H  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Hphfqdh0`  
 data.uID=98; Ks/Uyu. X  
 Shell_NotifyIcon(NIM_ADD,&data); G ]JWd  
 ShowWindow(SW_HIDE); IA(+}V  
 bTray=TRUE; A1kqWhg\  
} tLc~]G*\`s  
jHx)q|2\  
void CCaptureDlg::DeleteIcon() ?S0gazZm  
{ 48W-Tf6v|  
 NOTIFYICONDATA data; 5#}wI~U;  
 data.cbSize=sizeof(NOTIFYICONDATA); > Du>vlT Y  
 data.hWnd=GetSafeHwnd(); 'i7!"Y6>  
 data.uID=98; \!Fx,#r$7-  
 Shell_NotifyIcon(NIM_DELETE,&data); c&>==pI]k  
 ShowWindow(SW_SHOW); >XomjU[srQ  
 SetForegroundWindow(); V+MhS3VD  
 ShowWindow(SW_SHOWNORMAL); 8pE0ANbq  
 bTray=FALSE; <f/wWu}  
} RxrUnMF  
38HnW  
void CCaptureDlg::OnChange() 6JZ$; x{j  
{ 6~y7A<[^  
 RegisterHotkey(); w@Gk#  
} :d`8:gv?  
6H:'_|G  
BOOL CCaptureDlg::RegisterHotkey() Xw<5VIAHm;  
{ bR&<vrMmrA  
 UpdateData(); FK!UUy;  
 UCHAR mask=0; )WR*8659e  
 UCHAR key=0; dq U.2~9  
 if(m_bControl) *JmU",X  
  mask|=4; <Q%:c4N  
 if(m_bAlt) 1u\kxlZ  
  mask|=2; v>]^wH>/"  
 if(m_bShift) N \Wd 0b  
  mask|=1; ,Y_[+  
  key=Key_Table[m_Key.GetCurSel()]; m<wEw-1.  
 if(bRegistered){ B9Z=`c.T  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); )9mUE*[  
  bRegistered=FALSE; AfOq?V  
 } O:86*  
 cMask=mask; C~([aH@-I  
 cKey=key; ab-MEN`5  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); sXmo.{Ayb  
 return bRegistered; y |0I3n]e  
} /@~&zx&_  
y+D"LeCAad  
  四、小结 3V2w1CERE  
j"Vb8}  
  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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