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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: |'.SOm9)*  
  +a|4XyN  
  一、实现方法 09"~<W8  
K(p1+ GHC  
  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: "FU|I1Xz  
E.}Zmr#H  
#pragma data_seg("shareddata") $W09nz9?  
HHOOK hHook =NULL; //钩子句柄 li{_biey}  
UINT nHookCount =0; //挂接的程序数目 | @YN\g K;  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7XY C.g  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 YJ9_cA'A  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5E@V@kw  
static int KeyCount =0; qg O)@B+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ofSOy1  
#pragma data_seg() 6f?DW-)jp/  
WO{N@f^  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Qhr:d`@^]  
arB$&s  
  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: zumRbrz  
M3Z yf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6k[u0b`  
cKey,UCHAR cMask) NOx| #  
{ TwH(47|?Nt  
 BOOL bAdded=FALSE; ,9rT|:N  
 for(int index=0;index<MAX_KEY;index++){ 1/i|  
  if(hCallWnd[index]==0){ 'L,rJ =M3  
   hCallWnd[index]=hWnd; yZ 9 *oDs  
   HotKey[index]=cKey; OLi;/(g  
   HotKeyMask[index]=cMask; >}9TdP/oT  
   bAdded=TRUE; uODsXi{z  
   KeyCount++; \DHCf 4,  
   break; 7+ysE  
  } *~vRbD$q  
 } d+^;kse  
 return bAdded; YZk&'w  
} rf~Ss<  
//删除热键 h<j04fj  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T/3UF  
{ U*b SM8)L*  
 BOOL bRemoved=FALSE; ;(afz?T  
 for(int index=0;index<MAX_KEY;index++){ ]oY~8HW  
  if(hCallWnd[index]==hWnd){ k\[2o  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 56 )B/0=  
    hCallWnd[index]=NULL; iZ:-V8{  
    HotKey[index]=0; <7zpHSFBq  
    HotKeyMask[index]=0; V_~wWuZ-  
    bRemoved=TRUE; r*g _  
    KeyCount--; kA3kh`l  
    break; yG_#>3sD+%  
   } s:_5p`w>  
  } jIl-}/2  
 } x:2_FoQ  
 return bRemoved; BgRiJFa.d[  
} ''6"Xi|5  
6?74l;  
r1\.Jz  
  DLL中的钩子函数如下: ;?cUF78#  
nQ+{1 C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) MT*b+&1e  
{ 48DsRy  
 BOOL bProcessed=FALSE; k X-AC5]  
 if(HC_ACTION==nCode) k >MgrtJI  
 { 52~k:"c  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ux }DWrR  
   switch(wParam) dlU=k9N-  
   {  T>z@;5C  
    case VK_MENU: 936t6K&  
     MaskBits&=~ALTBIT; gK>Vm9rO  
     break; /x-t -}  
    case VK_CONTROL: pif8/e  
     MaskBits&=~CTRLBIT; VjnSi  
     break; iN><m|  
    case VK_SHIFT: #K[ @$BY:  
     MaskBits&=~SHIFTBIT; qq/Cn4fN8  
     break; ?ix,Cu@M  
    default: //judge the key and send message 8]c`n!u=`  
     break; !6KEW,  
   } }[Y):Yy  
   for(int index=0;index<MAX_KEY;index++){ X4TUi8ht!]  
    if(hCallWnd[index]==NULL) 4e(@b3y  
     continue; itvwmI,m\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rfZA21y{?  
    { F7hQNQu:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 0uvL,hF  
     bProcessed=TRUE; sPw(+m*C   
    } jlB3BwG{w  
   } ^KlOD_GN|  
  } h~1QmEat  
  else if((lParam&0xc000ffff)==1){ //有键按下 9W8Dp?:  
   switch(wParam) 8}0 D?  
   { "~ `-Jkm   
    case VK_MENU: ^?A+`1-  
     MaskBits|=ALTBIT; -Av/L>TxlI  
     break; :Y'nye3:  
    case VK_CONTROL: p[wjHfIq  
     MaskBits|=CTRLBIT; 3ty){#:  
     break; 5|b/G  
    case VK_SHIFT: w.3R1}R  
     MaskBits|=SHIFTBIT; \<8!b {F  
     break; XC$~!  
    default: //judge the key and send message ^T[ #rNkeL  
     break; }dxdxnVt  
   } F&P)mbz1  
   for(int index=0;index<MAX_KEY;index++){ A1_x^s  
    if(hCallWnd[index]==NULL) #-W5$1  
     continue; ?{2-,M0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ALv\"uUNu+  
    { -1o1k-8d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Mc8^{br61  
     bProcessed=TRUE; 83h3C EQ  
    } v+OVZDf  
   } jQDxbkIuzE  
  } pg<>Ow5,~l  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ,..b)H5n  
   for(int index=0;index<MAX_KEY;index++){ vfm-K;,#  
    if(hCallWnd[index]==NULL) #7>CLjI  
     continue; bcYz?o6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3)ip@29F  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |j+~Td3})&  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ieI-_]|[  
   } YU`{  
  } YszhoHYh  
 } :Ls36E8f=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); BpCSf.zZ  
} 5J;c;PF  
'UyL%h;nJ  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 3LmHH =  
oMPQkj;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +R_U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X}yYBf/R`  
\,N dg*qC  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ra&C|"~E  
%F~ dmA#:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~IXfID!8  
{ jt3SA [cy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) j{=%~  
 { 2S;zze7)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 e=_hfOUC  
  SaveBmp(); QKO(8D6+  
  return FALSE; l0_V-|x  
 } SS`C0&I@p  
 …… //其它处理及默认处理 nAzr!$qbNv  
} liTr3T`,V  
I?"5i8E  
9V&LJhDQ  
  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。 N9Ml&*%oX{  
[h1{{Nb#ez  
  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。 ?]z ._I`E  
9 2EMDKJ  
  二、编程步骤 -&? -  
/p>[$`Aq  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; `FwAlYJK  
krA))cP  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; El%(je,|  
-}J8|gwwp  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; F\I^d]#,[  
Go|65Z\`7M  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; m+g>s&1H  
epF>z   
  5、 添加代码,编译运行程序。 d1-p];&  
93\,m+-  
三、程序代码 UU/|s>F  
4pqZ!@45|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  AMdS+(J  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) hs4r5[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ *C BCQp[$  
#if _MSC_VER > 1000 7h2bL6Y88  
#pragma once <c#[.{A}s  
#endif // _MSC_VER > 1000 zCrcCr  
#ifndef __AFXWIN_H__ YO,ldsSz|r  
#error include 'stdafx.h' before including this file for PCH W}RR_Gu  
#endif *QG;KJ%  
#include "resource.h" // main symbols s<b7/;w'  
class CHookApp : public CWinApp 6,PL zZ5  
{ 3[0:,^a  
 public: je-s%kNlJ  
  CHookApp(); Q 1Ao65  
  // Overrides l&B'.6XKs  
  // ClassWizard generated virtual function overrides ~}w 8UO  
  //{{AFX_VIRTUAL(CHookApp) H~Cfni;  
 public: ^= G+]$8  
  virtual BOOL InitInstance(); 9x!y.gx  
  virtual int ExitInstance(); _SqrQ  
  //}}AFX_VIRTUAL 9[D7N  
  //{{AFX_MSG(CHookApp) YC'~8\x3z  
  // NOTE - the ClassWizard will add and remove member functions here. @Hh"Y1B  
  // DO NOT EDIT what you see in these blocks of generated code ! B}X#oA  
  //}}AFX_MSG e=jO_[  
  DECLARE_MESSAGE_MAP() 5MJ'/Fy(  
}; "puz-W'n  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); R{_IrYk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mQd?Tyvn  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @ni~ij  
BOOL InitHotkey(); Ne 4*MwK  
BOOL UnInit(); }^7V^W  
#endif /3]|B%W9  
3)Y:c2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. <.ky1aex7  
#include "stdafx.h"  Dfia=1A  
#include "hook.h" G.8b\E~  
#include <windowsx.h> qS al~  
#ifdef _DEBUG )v~]lk,o  
#define new DEBUG_NEW -e>)yM `i  
#undef THIS_FILE Z"Oa5V6[A  
static char THIS_FILE[] = __FILE__; Vm.@qO*=  
#endif Y=Qf!Cq]  
#define MAX_KEY 100 W<"\hQI  
#define CTRLBIT 0x04 =L%3q<]p  
#define ALTBIT 0x02 [<QWTMjR  
#define SHIFTBIT 0x01 'Aj>+H<B  
#pragma data_seg("shareddata") 99K+7G\{  
HHOOK hHook =NULL; N&=2 /  
UINT nHookCount =0; |U $-d^ZJ  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey tpONSRY  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT <>s\tJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey sdQv:nd'R  
static int KeyCount =0; 1#"Q' ,7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 4a!7|}W  
#pragma data_seg() UI C? S  
HINSTANCE hins; ,~(}lvqVH  
void VerifyWindow(); G`"Cqs<  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) u(702S4  
//{{AFX_MSG_MAP(CHookApp) ^<0NIu}  
// NOTE - the ClassWizard will add and remove mapping macros here. QaR.8/xV  
// DO NOT EDIT what you see in these blocks of generated code! NCt sx /C  
//}}AFX_MSG_MAP Xf9%A2 iB  
END_MESSAGE_MAP() RCXSz  
rrYp^xLa`  
CHookApp::CHookApp() :'~ gLW>j  
{ "b4iOp&:=  
 // TODO: add construction code here, (L%q/$  
 // Place all significant initialization in InitInstance u V7Hsg9l  
} tYZGf xj  
<9a_wGs  
CHookApp theApp; /g'-*:a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) XWpnZFjE  
{ ^1=|(Z/  
 BOOL bProcessed=FALSE; +Q31K7Gr  
 if(HC_ACTION==nCode) y$o=\:  
 { pVS2dwBqE  
  if((lParam&0xc0000000)==0xc0000000){// Key up ^]&{"!  
   switch(wParam) 9PK-r;2  
   { \/'n[3x  
    case VK_MENU: 5C1Rub)  
     MaskBits&=~ALTBIT; K"j=_%{  
     break; 9dtGqXX  
    case VK_CONTROL: :iB%JY Ad  
     MaskBits&=~CTRLBIT; k^c=y<I  
     break; es+_]:7B9  
    case VK_SHIFT: B@inH]wq  
     MaskBits&=~SHIFTBIT; K/v-P <g  
     break; 1Z8Oh_D C  
    default: //judge the key and send message  O'|P|  
     break; Ks2%F&\cE  
   } %C0O?q  
   for(int index=0;index<MAX_KEY;index++){ pm@Z[g  
    if(hCallWnd[index]==NULL) x*8f3^ wE  
     continue; E(kpK5h{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SoU'r]k1x  
    { Pl& `&N;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =v$s+`cP  
     bProcessed=TRUE; KGmc*Jwy  
    } wn|@D<  
   } ^@L l(?  
  } I7z/GA\x  
  else if((lParam&0xc000ffff)==1){ //Key down J?quYlS  
   switch(wParam) cN}A rv  
   { jI`To%^ Y  
    case VK_MENU: I@Z*Nu1L  
     MaskBits|=ALTBIT; np\2sa`  
     break; *M<BPxh0w]  
    case VK_CONTROL: Dh(T) yc  
     MaskBits|=CTRLBIT; !riMIl1  
     break; f\_!N "HW  
    case VK_SHIFT: w <>6>w@GZ  
     MaskBits|=SHIFTBIT; wU)5Evp[  
     break; S{i@=:  
    default: //judge the key and send message bSR+yr'?  
     break; _JJKbi  
   } _% 9+U [@  
   for(int index=0;index<MAX_KEY;index++) )  v5n "W  
   { 7h9[-d6  
    if(hCallWnd[index]==NULL) R|J>8AL}BY  
     continue; [S&O-b8A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fwv T2G4  
    { <&s)k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w[7.@%^[  
     bProcessed=TRUE; Xe3z6  
    } `}8@[iB'  
   } Q=L$7   
  } maUHjI 5A-  
  if(!bProcessed){ ? Ga2K  
   for(int index=0;index<MAX_KEY;index++){ #C;zS9(]B  
    if(hCallWnd[index]==NULL) ]n]uN~)9  
     continue; dFP-(dX#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |k .M+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @W\4UX3dK  
   } ddq 1NW  
  } 1;:t~Y  
 } K*U=;*p)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P[I*%  
} d?&!y]RS#  
=#Cf5s6qt  
BOOL InitHotkey() h3]@M$Y[  
{ Q@W|GOH3  
 if(hHook!=NULL){ %f_OP$;fc  
  nHookCount++; UG"6RW @  
  return TRUE; AK s39U'  
 } )Z8"uRTb0  
 else R(? <97  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [mf7>M`p]@  
  if(hHook!=NULL)  J"Y   
   nHookCount++; iPY vePQ  
  return (hHook!=NULL); <m /b]|  
} yg-FJ/  
BOOL UnInit() MpIw^a3(r  
{ Pm#x?1rAj  
 if(nHookCount>1){ (o6[4( G  
  nHookCount--; AJ?}Hel[0  
  return TRUE; =SK+ \j$  
 } }]g95xT  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ]Z$TzT&@%  
 if(unhooked==TRUE){ (O_t5<A*X  
  nHookCount=0; 2Z;`#{  
  hHook=NULL; mU3Y)  
 } +)JNFy-  
 return unhooked; '/u:,ar  
} `gt&Y-  
3:~l2KIP4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >1a \ %G  
{ @W1WReK]f  
 BOOL bAdded=FALSE; tFvgvx\:  
 for(int index=0;index<MAX_KEY;index++){ }} ``~  
  if(hCallWnd[index]==0){ PJK]t7vp  
   hCallWnd[index]=hWnd; fY%M=,t3c  
   HotKey[index]=cKey; Z.aLk4QO@  
   HotKeyMask[index]=cMask; Q k;Kn  
   bAdded=TRUE; *qO]v9 j  
   KeyCount++; qJ X+[PJ  
   break; B3cf] S%  
  } R?bn,T>  
 } GcZM+c  
 return bAdded; l~fh_IV1  
} xgtJl}L  
B%eDBu ")  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T\2) $  
{ +24|_Lx0  
 BOOL bRemoved=FALSE; 3b|7[7}&  
 for(int index=0;index<MAX_KEY;index++){ o%Uu.P  
  if(hCallWnd[index]==hWnd){ > h,y\uV1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ N /sEec  
    hCallWnd[index]=NULL; O>SuZ>g+7  
    HotKey[index]=0; i?a,^UM5n[  
    HotKeyMask[index]=0; = GH@.3`X  
    bRemoved=TRUE; H]tSb//qc  
    KeyCount--; N#RD:"RS!  
    break; 462!;/ y  
   } 192.W+H<  
  } pcRF: ~TE  
 } )BF \!sTn  
 return bRemoved; u>,lf\Fgz  
} XN~#gm#  
g{A3W) [ b  
void VerifyWindow() QIij>!c4  
{ <TLGfA1bC  
 for(int i=0;i<MAX_KEY;i++){ &\"Y/b]  
  if(hCallWnd!=NULL){ !B [1zE  
   if(!IsWindow(hCallWnd)){ ]r/(n]=(  
    hCallWnd=NULL; v:veV.y  
    HotKey=0; 8/Et&TJ`  
    HotKeyMask=0; 9Qt)m fqM  
    KeyCount--; & %N(kyp  
   } Pn'`Q S?  
  } X"hOHx5P  
 } M>?aa6@0  
} G *mO&:q  
_&; ZmNNhc  
BOOL CHookApp::InitInstance() b?Cmc  
{ 2!{_/@I\Y  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ->&BcPLn  
 hins=AfxGetInstanceHandle(); LKR==;qn  
 InitHotkey(); "xD}6(NL(r  
 return CWinApp::InitInstance(); DL'd&;6  
} T>\nWancQM  
%PQldPL8  
int CHookApp::ExitInstance() u;+%Qh  
{ ?G4iOiyt  
 VerifyWindow(); c&Gz> L  
 UnInit(); ]PR|d\O  
 return CWinApp::ExitInstance(); o5N]((9  
} 0M#N=%31  
dr| | !{\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Y H<$ +U  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) X+`ddX  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \yih 1Om>~  
#if _MSC_VER > 1000 U9<_6Bsd  
#pragma once /Y;+PAy  
#endif // _MSC_VER > 1000 (oLpnjJ(,  
9"WRIHt'c  
class CCaptureDlg : public CDialog y0scL7/  
{ I$aXnd6)  
 // Construction yD"]{  
 public: s~'9Hv9  
  BOOL bTray; f*{M3"$E  
  BOOL bRegistered; <)_:NRjBF&  
  BOOL RegisterHotkey(); {[Uti^)m%  
  UCHAR cKey; %:" RzHN  
  UCHAR cMask; Jq# [uX  
  void DeleteIcon(); ,(j>)g2Ob  
  void AddIcon(); |f"-|6  
  UINT nCount; MS{Hz,I,  
  void SaveBmp(); H,(F1+~d  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor - ,R0IGS  
  // Dialog Data ge^!F>whr  
  //{{AFX_DATA(CCaptureDlg) rU; g0'4e  
  enum { IDD = IDD_CAPTURE_DIALOG }; IM[54_I  
  CComboBox m_Key; :0nK`$'  
  BOOL m_bControl; Ezi' 2Sc  
  BOOL m_bAlt; (3AYy0J%  
  BOOL m_bShift; jZa25Z00  
  CString m_Path; IgLVn<5n  
  CString m_Number; X"kXNKV/n  
  //}}AFX_DATA ?$<SCN =  
  // ClassWizard generated virtual function overrides l!\1,J:}Z  
  //{{AFX_VIRTUAL(CCaptureDlg) j'k8^*M6  
 public:  G5!|y#T  
  virtual BOOL PreTranslateMessage(MSG* pMsg); i B%XBR  
 protected: ~;}\zKQKE  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +*n] tlk  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 63.( j P1;  
  //}}AFX_VIRTUAL W7%p^;ZQ$  
  // Implementation ~af8p {  
 protected: Pg7>ce  
  HICON m_hIcon; +<gg  
  // Generated message map functions IZ+ *`E  
  //{{AFX_MSG(CCaptureDlg) +z+ F-  
  virtual BOOL OnInitDialog(); !{ $qMhT  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); mRwXN*Izw  
  afx_msg void OnPaint(); sjSi;S4  
  afx_msg HCURSOR OnQueryDragIcon(); "P MO  
  virtual void OnCancel(); '-`O. 4u  
  afx_msg void OnAbout(); |drf"lX<{  
  afx_msg void OnBrowse(); S<V-ZV&_:U  
  afx_msg void OnChange(); <BZ_ (H  
 //}}AFX_MSG 1d`cTaQ-  
 DECLARE_MESSAGE_MAP() K-Re"zsz  
}; 8098y,mQe  
#endif bi+9R-=&  
KCE=|*6::|  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file HB%K|&!+  
#include "stdafx.h" QQ*gFP.Ao  
#include "Capture.h" 6j_ 678  
#include "CaptureDlg.h" ol50d73B  
#include <windowsx.h> : -E,   
#pragma comment(lib,"hook.lib") wc"9A~  
#ifdef _DEBUG  "";=DH  
#define new DEBUG_NEW J)_>%.  
#undef THIS_FILE wqcDAO (  
static char THIS_FILE[] = __FILE__; 6Ux[,]G K  
#endif '[%jjUU  
#define IDM_SHELL WM_USER+1 1bd$XnU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dQ,Q+ON>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); CdZnD#F2  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; i)=m7i  
class CAboutDlg : public CDialog X|,["Az 8  
{ gglf\)E;}E  
 public: B4@fY  
  CAboutDlg(); XWJ SLN(O  
  // Dialog Data x9h?e`  
  //{{AFX_DATA(CAboutDlg) ;r3}g"D@  
  enum { IDD = IDD_ABOUTBOX }; )Q~C4C-j  
  //}}AFX_DATA xF&6e&nv  
  // ClassWizard generated virtual function overrides ]}.0el{  
  //{{AFX_VIRTUAL(CAboutDlg) VXA[ TIqp  
 protected: f#1/}Hq/I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2.ew^D#  
  //}}AFX_VIRTUAL ^1R"7h  
  // Implementation Vu=] O/ =P  
 protected: aFyh,  
  //{{AFX_MSG(CAboutDlg) ,}KwP*:Z  
  //}}AFX_MSG -U7,k\g  
  DECLARE_MESSAGE_MAP() B& "RS  
}; 04~}IbeJ  
u >4ArtF  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #vtN+E  
{ 0JK2%%  
 //{{AFX_DATA_INIT(CAboutDlg) +N7"EROc  
 //}}AFX_DATA_INIT 0iF-}o  
} ndqckT@93  
eIsT!V" 7  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )Z("O[  
{ p=H3Q?HJ}  
 CDialog::DoDataExchange(pDX); s"q=2i  
 //{{AFX_DATA_MAP(CAboutDlg) &Bm&i.r  
 //}}AFX_DATA_MAP 02(h={  
} BGN9, ii  
G?R_aPP  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ,[Ag~.T  
 //{{AFX_MSG_MAP(CAboutDlg) 1& |  
 // No message handlers P8<hvMF  
 //}}AFX_MSG_MAP UoHd-  
END_MESSAGE_MAP() oXdel Ju?  
=MxpH+spI  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) j|mv+O  
: CDialog(CCaptureDlg::IDD, pParent) Z&-tMai;  
{ 1\y@E  
 //{{AFX_DATA_INIT(CCaptureDlg) w763 zi{  
  m_bControl = FALSE; !j0_ cA  
  m_bAlt = FALSE; nZxSMN0]  
  m_bShift = FALSE; &8n?  
  m_Path = _T("c:\\"); ?~Pv3'%d  
  m_Number = _T("0 picture captured."); Y([d;_#P  
  nCount=0; -R:X<eb  
  bRegistered=FALSE; "b`7[;a  
  bTray=FALSE; hXc}r6<B  
 //}}AFX_DATA_INIT AX;c}0g  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 '$?du~L-  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 'AWp6L@  
} F5U|9<  
2QL?]Vo  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \sITwPA[z  
{ dZDK7UL  
 CDialog::DoDataExchange(pDX); 85D? dgV  
 //{{AFX_DATA_MAP(CCaptureDlg) ^&MK42,\  
  DDX_Control(pDX, IDC_KEY, m_Key); SB/3jH  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); )b9_C O}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); r8,om^N6  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 4gb'7'  
  DDX_Text(pDX, IDC_PATH, m_Path); Y& 5.9 s@'  
  DDX_Text(pDX, IDC_NUMBER, m_Number); YQ7@D]#  
 //}}AFX_DATA_MAP Fm5Q&'`l  
} ?!y"OrHg  
j`9Qzi1  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) |mOMRP#'  
//{{AFX_MSG_MAP(CCaptureDlg) :v)6gz(p  
 ON_WM_SYSCOMMAND() L#2ZMy  
 ON_WM_PAINT() Z9VR]cf?  
 ON_WM_QUERYDRAGICON() [~)x<=H8{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ^BiP LQ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) n]iyFZ`9  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %J!NL0x_  
//}}AFX_MSG_MAP +{e`]t>_  
END_MESSAGE_MAP() R5ZIC4p  
-=mwy  
BOOL CCaptureDlg::OnInitDialog() #x)8f3I  
{ (hN?:q?'  
 CDialog::OnInitDialog(); #kci=2q_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Ha218Hy0W  
 ASSERT(IDM_ABOUTBOX < 0xF000); iD714+N(  
 CMenu* pSysMenu = GetSystemMenu(FALSE); #ouE r-=  
 if (pSysMenu != NULL)  n}OU Y  
 { |vz9Hs$@l  
  CString strAboutMenu; 96}eR,  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 1qZG`Vz  
  if (!strAboutMenu.IsEmpty()) NO4Z"3Pd_  
  { S/7l/DFb  
   pSysMenu->AppendMenu(MF_SEPARATOR); pV=@sz,G  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0>FE%  
  } Y{+3}drJE  
 } *)D1!R<\,R  
 SetIcon(m_hIcon, TRUE); // Set big icon :j,}{)5=  
 SetIcon(m_hIcon, FALSE); // Set small icon V{ |[oIp  
 m_Key.SetCurSel(0); o(fyd)t  
 RegisterHotkey(); fEwifSp.  
 CMenu* pMenu=GetSystemMenu(FALSE); =$&&[&  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); qrE0H  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); !i Jipe5  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )4m_A p\  
 return TRUE; // return TRUE unless you set the focus to a control d.AC%&W  
}  :,~K]G  
E}YI WTX  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9!#EwPD$#  
{ gr+Pl>C{  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) EEwWucQ  
 { r6 }_H?j  
  CAboutDlg dlgAbout; h.}u?{  
  dlgAbout.DoModal(); &d,Wy"WPi  
 } U\bC0q   
 else sLhDO'kM  
 { QNg\4%  
  CDialog::OnSysCommand(nID, lParam); FmD +8=  
 } VB"(9O]  
} 5v|EAjB6o  
= F<:}Tx)C  
void CCaptureDlg::OnPaint() taDQ65  
{ X8R1a?  
 if (IsIconic()) pkk4h2Ah  
 { "dtlME{Bx  
  CPaintDC dc(this); // device context for painting %/pc=i|+  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &*gbK6JB  
  // Center icon in client rectangle QBihpA 1;  
  int cxIcon = GetSystemMetrics(SM_CXICON); ^l(^z fsZ  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7 :U8 f:  
  CRect rect; t$I|E  
  GetClientRect(&rect); l"\uf(0K  
  int x = (rect.Width() - cxIcon + 1) / 2; U=m=1FYaG  
  int y = (rect.Height() - cyIcon + 1) / 2; m&/=&S  
  // Draw the icon ~kb{K;  
  dc.DrawIcon(x, y, m_hIcon); Uk'U?9O  
 } vpLMhf`  
 else eaAPKx  
 { _#pnjo   
  CDialog::OnPaint(); 1~Mn'O%  
 } y6%<zhs  
} #PFO]j!_b  
5[R?iSGL1  
HCURSOR CCaptureDlg::OnQueryDragIcon() l$M +.GB<  
{ gtYRV*^q  
 return (HCURSOR) m_hIcon; "8/dD]=f^a  
} m~>@BCn;  
BY( eV!  
void CCaptureDlg::OnCancel() 9)lZyE}   
{ rQj~[Y.c  
 if(bTray) 1exfCm  
  DeleteIcon(); 0>@[o8  
  CDialog::OnCancel(); $ $4W}Ug3U  
} fM ^<+o@  
XU9'Rfp  
void CCaptureDlg::OnAbout() &t3Jv{  
{ w2zp#;d  
 CAboutDlg dlg; Ac\W\=QvB  
 dlg.DoModal(); 88o:NJ}_  
} c<jB6|.=2  
/gw Cwyo  
void CCaptureDlg::OnBrowse() i@,]Z~]  
{ jBRPR R0  
 CString str; 1X&B:_  
 BROWSEINFO bi; vGN3 YcH  
 char name[MAX_PATH];  Zi4d]  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); =DMbz`t  
 bi.hwndOwner=GetSafeHwnd(); 28oJFi]  
 bi.pszDisplayName=name; MZ~.(&  
 bi.lpszTitle="Select folder"; M[s\E4l:t  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; d+5:Qrr  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Kz[BB@[  
 if(idl==NULL) #{,h@g}W  
  return; KY+]RxX  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <'2u a  
 str.ReleaseBuffer(); [@2s&Ct;  
 m_Path=str; j-32S!  
 if(str.GetAt(str.GetLength()-1)!='\\') 6?o>{e7n^  
  m_Path+="\\"; 6mHhC?  
 UpdateData(FALSE); a D|Yo  
} TQ'e  
p;`N\.ld  
void CCaptureDlg::SaveBmp() ' ^a!`"Bc  
{ ;rHz;]si  
 CDC dc; /b{HG7i\  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); [`nY2[A$  
 CBitmap bm; 9L"?wv  
 int Width=GetSystemMetrics(SM_CXSCREEN); ;BVDt  
 int Height=GetSystemMetrics(SM_CYSCREEN); . r `[  
 bm.CreateCompatibleBitmap(&dc,Width,Height); c<tmj{$  
 CDC tdc; :e2X/tl#  
 tdc.CreateCompatibleDC(&dc); q"nGy#UWR  
 CBitmap*pOld=tdc.SelectObject(&bm); Y iZx{5  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ) b:4uK A  
 tdc.SelectObject(pOld); 5f_7&NxT  
 BITMAP btm; fU ={a2  
 bm.GetBitmap(&btm); 61:9(*4~!F  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )4ncutb  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); WG%2<Q^  
 BITMAPINFOHEADER bih; &+- e  
 bih.biBitCount=btm.bmBitsPixel; w-FHhf  
 bih.biClrImportant=0; ]^ 'ZiyJX  
 bih.biClrUsed=0; Q52 bh'cuU  
 bih.biCompression=0; kzi|$Gs<  
 bih.biHeight=btm.bmHeight; zlkWU  
 bih.biPlanes=1; -u~eZ?(!Ye  
 bih.biSize=sizeof(BITMAPINFOHEADER); /qXzOd  
 bih.biSizeImage=size; z2~87fv+  
 bih.biWidth=btm.bmWidth; ZNL5({lv  
 bih.biXPelsPerMeter=0; s=U\_koyH  
 bih.biYPelsPerMeter=0; xJc.pvVPw  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <Uwwux<v  
 static int filecount=0; U>A6eWhH  
 CString name; ImHU:iR[J-  
 name.Format("pict%04d.bmp",filecount++); 8\_*1h40s  
 name=m_Path+name; qTy v.#{y  
 BITMAPFILEHEADER bfh; KPggDKS  
 bfh.bfReserved1=bfh.bfReserved2=0; JqEb;NiP)5  
 bfh.bfType=((WORD)('M'<< 8)|'B'); :8]6#c6`74  
 bfh.bfSize=54+size; e=J*Esc@k  
 bfh.bfOffBits=54; "TFwHe3C4  
 CFile bf; 26PD[af64O  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ x4 hO$3o  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `]{Psc6_=  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,`)OEI|1d  
  bf.WriteHuge(lpData,size); @_Sp3nWdu  
  bf.Close(); ^ZVO ql&  
  nCount++; ~`[8"YUL  
 } vJThU$s-  
 GlobalFreePtr(lpData); ?*+1~m>  
 if(nCount==1) 7@a\*|K6  
  m_Number.Format("%d picture captured.",nCount); bd{\{[^S!  
 else K?YEoz'y[  
  m_Number.Format("%d pictures captured.",nCount); {aIZFe}B  
  UpdateData(FALSE); dEET}s\  
} R@$+t:}  
k =|K|  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) JV%nH! Fs  
{ zq=&4afOE  
 if(pMsg -> message == WM_KEYDOWN) JWWInuH  
 { {*fUJmao"  
  if(pMsg -> wParam == VK_ESCAPE) 5M.Red.L  
   return TRUE; 5Pqt_ZWy  
  if(pMsg -> wParam == VK_RETURN) O! (85rp/  
   return TRUE; H &fTh  
 } nl9kYE [  
 return CDialog::PreTranslateMessage(pMsg); c(&AnIlS  
} rkIMM,   
|0]YA  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) CjV7q y  
{ D!me%;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ D2$^"  
  SaveBmp(); 5p{25N_t  
  return FALSE; c/RT0xql*  
} eA&t %  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ z}3di5+P  
 CMenu pop; ^XNw$@&',  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); -;ER`Jqs,  
 CMenu*pMenu=pop.GetSubMenu(0); 9C=~1>S  
 pMenu->SetDefaultItem(ID_EXITICON); Yx 3|G  
 CPoint pt; /N%zwj/*  
 GetCursorPos(&pt); g/B\ObY  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); v^\JWPR/  
 if(id==ID_EXITICON) Iu%^*K%  
  DeleteIcon(); Iht'e8)gq  
 else if(id==ID_EXIT) O$U}d-Xnx  
  OnCancel(); UQnBqkE  
 return FALSE; jm+ blB^%K  
} Bs@:rhDi  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); AHWh}~Yi  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) X98#QR#m  
 AddIcon(); lJlhl7  
 return res; $':JI#  
} sX!3_ '-  
Z,SY N?@  
void CCaptureDlg::AddIcon() (H2ylMpQt  
{ GI?PGAT  
 NOTIFYICONDATA data; Eo Ko   
 data.cbSize=sizeof(NOTIFYICONDATA); LS{bg.e  
 CString tip; 0W_mCV  
 tip.LoadString(IDS_ICONTIP); 7|{ B#  
 data.hIcon=GetIcon(0); "R8.P/ 3  
 data.hWnd=GetSafeHwnd();  }Zt.*%  
 strcpy(data.szTip,tip); R)Q/Ff@o0  
 data.uCallbackMessage=IDM_SHELL; l[Tt[n  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /Bh>  
 data.uID=98;  M$F{N  
 Shell_NotifyIcon(NIM_ADD,&data); J ZA*{n2  
 ShowWindow(SW_HIDE); R qn WtE  
 bTray=TRUE; m|lM.]2_  
} ]  ~'9  
HmW=t}!  
void CCaptureDlg::DeleteIcon() <c(&T<$  
{ _TrZ'iL}T  
 NOTIFYICONDATA data; {hM"TO7\  
 data.cbSize=sizeof(NOTIFYICONDATA); ;*nh=w  
 data.hWnd=GetSafeHwnd(); "% SX@  
 data.uID=98;  w"BIv9N  
 Shell_NotifyIcon(NIM_DELETE,&data); t@6w$5:}  
 ShowWindow(SW_SHOW); *.:!Ax  
 SetForegroundWindow(); 1y 1_6TZ+  
 ShowWindow(SW_SHOWNORMAL); p1klLX  
 bTray=FALSE; ^]i" H|(x  
} ?P%|P   
%n4@[fG%K  
void CCaptureDlg::OnChange() +;YE)~R?  
{ vUqe.?5  
 RegisterHotkey(); 4Q@\h=r  
} b'&LBT7  
nT#37v  
BOOL CCaptureDlg::RegisterHotkey() &yB%QX{3  
{ z}iSq$  
 UpdateData(); lx`q *&E  
 UCHAR mask=0; c5<kbe  
 UCHAR key=0; 7&h\l6}Yh  
 if(m_bControl) xC'mPcU8  
  mask|=4; q)vK`\Y  
 if(m_bAlt) )sRN!~  
  mask|=2; (v]P<3%  
 if(m_bShift) l},dQ4R  
  mask|=1; ijE<spG  
  key=Key_Table[m_Key.GetCurSel()]; CcBQo8!G  
 if(bRegistered){  ccRlql(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); )4@M`8  
  bRegistered=FALSE; J`4Z<b53  
 } mZ]P[lQ'5  
 cMask=mask; ?n2C  
 cKey=key; *3 !(*F@M,  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); X {#bJ  
 return bRegistered; 7qpzk7X?pR  
} 9z+vFk`  
Ih(:HFRMq6  
  四、小结 $|rCrak;  
={\![{L  
  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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