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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: Q:4euhz*  
  MJ+]\(  
  一、实现方法 `p. O  
NgXV|) L  
  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: 'Oe}Ja  
"ccP,#Y  
#pragma data_seg("shareddata") ~dO&e=6Hk  
HHOOK hHook =NULL; //钩子句柄 d^Jf(NE0Yo  
UINT nHookCount =0; //挂接的程序数目 Xw2tCRzD  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 zwyK \j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 B- VhUS  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey w[V71Iej  
static int KeyCount =0; b&$sY!iU  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 [qEd`8V (  
#pragma data_seg() h5.>};"@ '  
lN-[2vT<  
  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。 N))G/m3  
X+*"FKm 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: BVt)~HZ  
uWSfr(loX  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR QE8aYPSFf  
cKey,UCHAR cMask) eT|"6WJ:{  
{ 9se ,c  
 BOOL bAdded=FALSE; 34$qV{Y%y  
 for(int index=0;index<MAX_KEY;index++){ Lb>UraUvL  
  if(hCallWnd[index]==0){ ;1&7v  
   hCallWnd[index]=hWnd; Gpauy=4f  
   HotKey[index]=cKey; JN Ur?+g  
   HotKeyMask[index]=cMask; k^ZcgHHgb  
   bAdded=TRUE; nd 5w|83  
   KeyCount++; ~e)`D nJ  
   break; 50S >`qi2x  
  } =n}+p>\s  
 } u=5~^ 9  
 return bAdded; %Z"I=;=nxI  
} +$YluGEJ  
//删除热键 aNW!Y':*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P}El#y#&  
{ eI 6G  
 BOOL bRemoved=FALSE; VZ:L K  
 for(int index=0;index<MAX_KEY;index++){ %z_PEqRj  
  if(hCallWnd[index]==hWnd){ C6XZZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -0{"QhdE%  
    hCallWnd[index]=NULL; \R0&*cnmo  
    HotKey[index]=0; Y_}DF.>I P  
    HotKeyMask[index]=0; 9Xu O\+z  
    bRemoved=TRUE; QE.a2 }  
    KeyCount--; B-<H8[GkG1  
    break; PJCRvs|X  
   } C(^IX"9 #  
  } jd&kak  
 } A{!D7kwTz~  
 return bRemoved; ;DkX"X+  
} v/Z!Wp1LV  
.\?)O+J!  
2 P=c1;  
  DLL中的钩子函数如下: "[*W=6m0  
1P'R-I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) OC[+t6  
{ {y[T3(tt  
 BOOL bProcessed=FALSE; +])St3h  
 if(HC_ACTION==nCode) qOV6Kh)  
 { pErre2fS  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,MtN_V-  
   switch(wParam) ;LBq!  
   {  dz6i~&  
    case VK_MENU: B@Ae2_;  
     MaskBits&=~ALTBIT; m 8Q[+_:$H  
     break; YXR%{GUP[  
    case VK_CONTROL: #^>5,M2  
     MaskBits&=~CTRLBIT; Vko1{$}t  
     break; C>?`1d@  
    case VK_SHIFT: Rr#vv  
     MaskBits&=~SHIFTBIT; wuv2bd )+  
     break; %Q}T9%Mtj  
    default: //judge the key and send message k lRS:\dW  
     break; K'`N(WiL  
   } d`z),A=  
   for(int index=0;index<MAX_KEY;index++){ O=HT3gp&  
    if(hCallWnd[index]==NULL) .[ Z<r>  
     continue; Felu`@b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \eD{bD  
    { oWZbfR9R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 483BrFV  
     bProcessed=TRUE; \9*,[mvC  
    } gUo L8~  
   } j&G*$/lTO6  
  } 5df~] -=0Y  
  else if((lParam&0xc000ffff)==1){ //有键按下 llf|d'5Nl  
   switch(wParam) w2!5Cb2  
   { H!D?;X  
    case VK_MENU: nJ.<yrzi  
     MaskBits|=ALTBIT; Zz\e:/  
     break; :\+;5Se+l  
    case VK_CONTROL: Tn~b#-0  
     MaskBits|=CTRLBIT; +,xl_,Z6  
     break; H$ !78/f  
    case VK_SHIFT: vKzq7E  
     MaskBits|=SHIFTBIT; O6LuFT .  
     break; #'qEm=%  
    default: //judge the key and send message f?iQ0wv)  
     break; | %Dh  
   } uqhNi!;  
   for(int index=0;index<MAX_KEY;index++){ !,#42TY*X  
    if(hCallWnd[index]==NULL) t\hvhcbL  
     continue; (W<n<sl:-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p+O 2 :  
    { 6wzTX8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2BU%4IG  
     bProcessed=TRUE; !,mv 7Yj  
    }  1k5o?'3&  
   } u0;FQr2  
  }  xZ*.@Pkr  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Y5}<7s\UDO  
   for(int index=0;index<MAX_KEY;index++){ ( aGwe@AS  
    if(hCallWnd[index]==NULL) %|l^oC+E  
     continue; S$!)Uc\)A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *}Al0\q0M  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g4BEo'  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 AwhXCq|k  
   } !N4?>[E  
  } $e=pdD~  
 } Y7{9C*>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); I/ pv0  
} QMGMXa   
S C8r.  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Z7<N<  
;:nO5VFOg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t7rz]EN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dF$Fd{\4^  
$Ik\^:-  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: /( /)nYAjk  
By|y:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c=U1/=R5  
{ 1M|DaAI  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4s?x 8oAy  
 { :%M[|Fj  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 O.n pi: a  
  SaveBmp(); yq{k:)  
  return FALSE; QGtKu:c.81  
 } l@ +]XyLj  
 …… //其它处理及默认处理 ~.;S>o[  
} tL?nO#Qx  
i-(^t1c  
6m_whGosi  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 qB`zyd8yu  
#`tn:cP  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。  g?qh  
U*G9fpVy  
  二、编程步骤 [vuqH:Ln  
.JNU3%s  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; fmDU  
Sm;EWz-?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; hadGF%> O6  
lW! U:  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 3YyB0BMW  
k T$yHB #  
  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; ZyBNo]  
rz c}2I  
  5、 添加代码,编译运行程序。 :T5p6:  
nu {bEp  
三、程序代码 *I0{1cST  
WH F>J  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL qRMH[F$`  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Jsee8^_~  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ^c1%$@H  
#if _MSC_VER > 1000 \Uun2.K  
#pragma once gkdd#Nrk  
#endif // _MSC_VER > 1000 Gld|w=qr  
#ifndef __AFXWIN_H__ rs$sAa*f  
#error include 'stdafx.h' before including this file for PCH zi~_[l-  
#endif "Jw6.q+  
#include "resource.h" // main symbols VmLV:"P}^  
class CHookApp : public CWinApp A&#P=m j  
{ |A_yr/f  
 public: Xp <RG p7E  
  CHookApp(); wv>uT{g#  
  // Overrides X4emhB  
  // ClassWizard generated virtual function overrides =4z:Df  
  //{{AFX_VIRTUAL(CHookApp) _ukKzY  
 public: D*d@<&Bl4<  
  virtual BOOL InitInstance(); }-H<wQ&x  
  virtual int ExitInstance(); $QQv$  
  //}}AFX_VIRTUAL `A5^D  
  //{{AFX_MSG(CHookApp) A~ugx~S0  
  // NOTE - the ClassWizard will add and remove member functions here. 7dl]f#uZU  
  // DO NOT EDIT what you see in these blocks of generated code ! .d:sQ\k~=  
  //}}AFX_MSG FHVZ/ e  
  DECLARE_MESSAGE_MAP() "R-1 G/  
}; yBKkx@o#z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); M IPmsEdBi  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "|{O%X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pqPhtWi%PJ  
BOOL InitHotkey(); =T$-idx1l  
BOOL UnInit(); k36%n *4  
#endif MR$Bl"d  
45l/)=@@B  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. cDMA#gp  
#include "stdafx.h" 3R%'<MV|  
#include "hook.h" (,eH*/~/  
#include <windowsx.h> mjbr}9  
#ifdef _DEBUG \HFeEEKH  
#define new DEBUG_NEW g+gHIb7{  
#undef THIS_FILE Uv,_VS(  
static char THIS_FILE[] = __FILE__; D'e'xU  
#endif "=I ioY  
#define MAX_KEY 100 vS %r_gf(  
#define CTRLBIT 0x04 ;L.@4b[lP  
#define ALTBIT 0x02 *h Ph01  
#define SHIFTBIT 0x01 &) 7umdSgi  
#pragma data_seg("shareddata") mc_`:I=  
HHOOK hHook =NULL; wXf_2qB9  
UINT nHookCount =0; :(EU\yCzK  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey x0wy3+GZc  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |V{'W-` |[  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 2ul!f7#E  
static int KeyCount =0; 7-81,ADv(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift :70cOt~Z  
#pragma data_seg() -fu=RR  
HINSTANCE hins; ckRWVw   
void VerifyWindow(); %RgCU$s[>  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) jj8AV lN  
//{{AFX_MSG_MAP(CHookApp) C.dN)?O  
// NOTE - the ClassWizard will add and remove mapping macros here. =BpX;n <  
// DO NOT EDIT what you see in these blocks of generated code! kBd #=J  
//}}AFX_MSG_MAP T!eb=oy  
END_MESSAGE_MAP() &Mbpv)V8  
#imMkvx?  
CHookApp::CHookApp() R?g qPi-  
{ qy6zHw  
 // TODO: add construction code here, R iid,n  
 // Place all significant initialization in InitInstance RrSo`q-h+  
} C,:3z  
Oa=0d;_  
CHookApp theApp; TfK$tTkM  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) N?0T3-/K  
{ 5!,`LM9  
 BOOL bProcessed=FALSE; @qH{;  
 if(HC_ACTION==nCode) S5]rIcM  
 { s<x2*yVUA  
  if((lParam&0xc0000000)==0xc0000000){// Key up ?}y?e}y*xZ  
   switch(wParam) uNV (r"  
   { ipfiarT~)  
    case VK_MENU: \:C@L&3[  
     MaskBits&=~ALTBIT; `V[{(&?,n  
     break; +~RiCZt  
    case VK_CONTROL: u(\O  
     MaskBits&=~CTRLBIT; a2 fV0d6*l  
     break; rz0~W6 U  
    case VK_SHIFT: +9>t; Ty  
     MaskBits&=~SHIFTBIT; gl-O"%rMcL  
     break; 'l2'%@E>  
    default: //judge the key and send message :N5R.@9  
     break; MnUal}MO  
   } n *|F=fl  
   for(int index=0;index<MAX_KEY;index++){ z>+@pj   
    if(hCallWnd[index]==NULL) lil1$K: i  
     continue; nE)?P*$3Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g9I2 e<;o  
    { "Q;n-fqf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); N8;/Zd;^  
     bProcessed=TRUE; !Y/$I?13Z  
    } !q!.OQ  
   } =rcqYPul0  
  } O#fGHI<43[  
  else if((lParam&0xc000ffff)==1){ //Key down 7u-o7#,X2  
   switch(wParam) +/*,%TdQ4  
   { \'6hv>W@  
    case VK_MENU: bCHA!zO  
     MaskBits|=ALTBIT; DU#6%8~  
     break; S !cc%  
    case VK_CONTROL: *?%DdVrO@  
     MaskBits|=CTRLBIT; r8rU+4\8<  
     break; AjB-&Z  
    case VK_SHIFT: -4{sr| lm  
     MaskBits|=SHIFTBIT; o7E?A  
     break; WjtmV2b<7  
    default: //judge the key and send message 8@ck" LUzD  
     break; a=\r~Z7E  
   } OF*m 9  
   for(int index=0;index<MAX_KEY;index++) 7HzO_u%H1  
   { Qp~O!9ph  
    if(hCallWnd[index]==NULL) 5Og.:4  
     continue; Jj}+tQ f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w=I8f}(  
    { Zo}wzY~x>I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {j.5!Nj]B  
     bProcessed=TRUE; <[Ae 0UK  
    }  RSXYz8{  
   } yZ=wT,Y  
  } `=8g%O|T  
  if(!bProcessed){ s,O:l0  
   for(int index=0;index<MAX_KEY;index++){ Q1?  !,a  
    if(hCallWnd[index]==NULL) uFNVV;~RFI  
     continue; gtWJR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) X*6bsYbK-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); GV'Y'  
   } <eK F  
  } F Cg{!h  
 } ,cD(s(6+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); > f,G3Ay  
} =m6;]16D  
z6#~B&  
BOOL InitHotkey() >QV=q`I  
{ gnF]m0LR  
 if(hHook!=NULL){ ^c" wgRHc<  
  nHookCount++; `Et)@{iP  
  return TRUE; { [ QCuR  
 } zts%oIgV  
 else d-w#\ ^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); +]P? ?`,R;  
  if(hHook!=NULL) 1>bG]l1//  
   nHookCount++; F1%-IBe  
  return (hHook!=NULL); \zCT""'i  
} =n|n%N4Y  
BOOL UnInit() vfPL;__{Y]  
{ .XQ_,  
 if(nHookCount>1){ ;:NW  
  nHookCount--; `b 6j7  
  return TRUE; fOs}5J  
 } gB,~Y511  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 1:5jUUL8  
 if(unhooked==TRUE){ #]pFE.o  
  nHookCount=0; -@f5d  
  hHook=NULL; eSNi6RvE  
 } v {E~R  
 return unhooked; uQgv ;jsPz  
} Y8YNRyc=  
[A99e`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ib8@U}Vn1  
{ ,;9byb  
 BOOL bAdded=FALSE; z/yNFY]i  
 for(int index=0;index<MAX_KEY;index++){ %7WGodlXW  
  if(hCallWnd[index]==0){ *^+8_%;1  
   hCallWnd[index]=hWnd; qELy'\  
   HotKey[index]=cKey; k_$:?$  
   HotKeyMask[index]=cMask; ^F/gJ3_;  
   bAdded=TRUE; 4sOo>.<x  
   KeyCount++; <]#'6'  
   break; 7jP C{W  
  }  >sk vg  
 } |c,,*^  
 return bAdded;  uaN0X"  
} (F9U`1~4  
-)_"7}|u5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _GSl}\  
{ ,x#5.Koz  
 BOOL bRemoved=FALSE; qBL >C\V +  
 for(int index=0;index<MAX_KEY;index++){ #)hc^gIO&<  
  if(hCallWnd[index]==hWnd){ G*.}EoA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j t9fcw  
    hCallWnd[index]=NULL; *m$P17/C  
    HotKey[index]=0; H]2cw{2  
    HotKeyMask[index]=0; jinDKJ,n;  
    bRemoved=TRUE; \=3V]7\&  
    KeyCount--; . Z 93S|q  
    break; NJ\ID=3l  
   } n@IpO i$Q  
  } ^)|8N44O  
 } `rEu8u  
 return bRemoved; c!n\?lB  
} T 2Uu/^  
8bT]NvCA  
void VerifyWindow() ^i>Tm9vM  
{ =y)e&bj  
 for(int i=0;i<MAX_KEY;i++){ z2:^Qg  
  if(hCallWnd!=NULL){ +zM WIG  
   if(!IsWindow(hCallWnd)){ G 92\` Q  
    hCallWnd=NULL; Pyfj[m4+}  
    HotKey=0; Se*o{V3s$  
    HotKeyMask=0; N,N9K  
    KeyCount--; X.^S@3[  
   } i> }P V  
  } i}d^a28  
 } 1yHlBeEC  
}  {*!L[)  
V}c3}'_U]  
BOOL CHookApp::InitInstance() d~#>.$Uu  
{ $J]VY;C!  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ,ru2C_LQ  
 hins=AfxGetInstanceHandle(); PX7@3Y  
 InitHotkey(); 'vbrzI5m  
 return CWinApp::InitInstance(); $,Q0ay  
} R'M=`33M  
Y|%s =0M  
int CHookApp::ExitInstance() F\LAw#IJ  
{ J0xV\O !e  
 VerifyWindow(); )?es3Ehqq  
 UnInit(); jhU'UAn  
 return CWinApp::ExitInstance(); Vqr#%. N  
} `x b\)  
4}C^s\?z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,|:TML  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) `v;9!ReZV  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,ddoII  
#if _MSC_VER > 1000 ;h|zNx0  
#pragma once !h\>[O  
#endif // _MSC_VER > 1000 6k569c{7  
v D"4aw  
class CCaptureDlg : public CDialog 9 GEMmo3  
{ Q)`3&b  
 // Construction QYl Pr&O9  
 public: 2VB|a;Mo  
  BOOL bTray; [diUO1p  
  BOOL bRegistered; dY|~"6d)  
  BOOL RegisterHotkey(); HP/f`8  
  UCHAR cKey; 'IVNqfC)u  
  UCHAR cMask; .K I6<k/  
  void DeleteIcon(); "}"hQ.kAz  
  void AddIcon(); [w>T.b  
  UINT nCount; ] yg3|C;  
  void SaveBmp(); &A}@@d  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Q7V*~{  
  // Dialog Data Nu}x`Qkmr  
  //{{AFX_DATA(CCaptureDlg) G3[X.%g`  
  enum { IDD = IDD_CAPTURE_DIALOG }; v@_^h}h/,=  
  CComboBox m_Key; AcRrk  
  BOOL m_bControl; G3Z>,"w;=  
  BOOL m_bAlt; ?%)G%2  
  BOOL m_bShift; ;^fGQ]`4  
  CString m_Path; j.}@9  
  CString m_Number; _SVIY@K|/  
  //}}AFX_DATA O $ p  
  // ClassWizard generated virtual function overrides 'aj97b;lpG  
  //{{AFX_VIRTUAL(CCaptureDlg) cOhx  
 public: ,drbj.0-  
  virtual BOOL PreTranslateMessage(MSG* pMsg); g4p-$WyT8>  
 protected: }02#[vg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nw.,`M,N  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); I%4)%  
  //}}AFX_VIRTUAL g3fxf(iY(  
  // Implementation no~Yet+<"  
 protected: 6A$  Y]u  
  HICON m_hIcon; jFE1k(2e  
  // Generated message map functions {DP%=4  
  //{{AFX_MSG(CCaptureDlg) y~16o   
  virtual BOOL OnInitDialog(); ;_bZH%o.  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); O{P@fv%~(o  
  afx_msg void OnPaint(); 3c%dErch  
  afx_msg HCURSOR OnQueryDragIcon(); `lI(SS]w  
  virtual void OnCancel(); 1u9*)w  
  afx_msg void OnAbout(); gfr y5e  
  afx_msg void OnBrowse();  gAFu  
  afx_msg void OnChange(); [.ya&E)x  
 //}}AFX_MSG oR``Jiob|  
 DECLARE_MESSAGE_MAP() _lK+/"-l  
}; aRt`IcZYz  
#endif !Eqp,"ts7  
VXfp=JE  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file F'NX  
#include "stdafx.h" uD'GI  
#include "Capture.h" u*W6fg/"  
#include "CaptureDlg.h" lla?;^,  
#include <windowsx.h> T6Oah:50EM  
#pragma comment(lib,"hook.lib") `<cn b!]  
#ifdef _DEBUG [wLK*9@&  
#define new DEBUG_NEW KR49Y>s<  
#undef THIS_FILE d9qA\ [  
static char THIS_FILE[] = __FILE__; a;GuFnfn,  
#endif VM.4w.})_E  
#define IDM_SHELL WM_USER+1 q3_ceXYU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uT\|jv,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w#-J ?/m  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @.D1_A  
class CAboutDlg : public CDialog @2X{e7+D  
{ o+}>E31a  
 public: o.o$dg(r!  
  CAboutDlg(); w6Owfq'v  
  // Dialog Data *_qLLJg  
  //{{AFX_DATA(CAboutDlg) }{oZdO  
  enum { IDD = IDD_ABOUTBOX }; xJNV^u  
  //}}AFX_DATA @Yu=65h  
  // ClassWizard generated virtual function overrides >GV(\In  
  //{{AFX_VIRTUAL(CAboutDlg) )qq5WShMJ  
 protected: !e<D2><^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .+.'TY--  
  //}}AFX_VIRTUAL d?9b6k?  
  // Implementation /Wx({N'h$  
 protected: Kw/7X[|'G  
  //{{AFX_MSG(CAboutDlg) %}`zq8Q;  
  //}}AFX_MSG _MmSi4]yd  
  DECLARE_MESSAGE_MAP() 1:.I0x!  
}; ~uUN\qx52  
QTC-W2t]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) XCP/e p  
{ <3SO1@?  
 //{{AFX_DATA_INIT(CAboutDlg) =sIkA)"!=  
 //}}AFX_DATA_INIT A.8[FkiNmD  
} 8AGP*"gI  
Y|3n^%I  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) uOv0ut\\G  
{ :(?F(Q^  
 CDialog::DoDataExchange(pDX);  l,lfkm  
 //{{AFX_DATA_MAP(CAboutDlg) CRh.1-  
 //}}AFX_DATA_MAP 'ZiTjv ]  
} SNUq  
F\Z|JCA  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SQS PdR+  
 //{{AFX_MSG_MAP(CAboutDlg) VfFXH,j  
 // No message handlers GN=ugP 9  
 //}}AFX_MSG_MAP @OB7TI_/   
END_MESSAGE_MAP() CI8bHY$  
>Ohh) $  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) d#W>"Cqxqa  
: CDialog(CCaptureDlg::IDD, pParent) wG-lR,glb  
{ `B%IHr  
 //{{AFX_DATA_INIT(CCaptureDlg) a3wk#mH  
  m_bControl = FALSE; K|ZB!oq  
  m_bAlt = FALSE; xIb"8,N  
  m_bShift = FALSE; ->u}b?aF  
  m_Path = _T("c:\\"); cH7Gb|,M  
  m_Number = _T("0 picture captured.");  yh'uH  
  nCount=0; G.B~n>}JU,  
  bRegistered=FALSE; 9sId2py]W  
  bTray=FALSE; Z`jSpgWR  
 //}}AFX_DATA_INIT VUQx"R9-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 "3Lq/mJYnZ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6!|/(~  
} 71I: P|.>  
g.]S5(  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4UISuYg'  
{ d95 $w8>  
 CDialog::DoDataExchange(pDX); NGs@z^&V  
 //{{AFX_DATA_MAP(CCaptureDlg) OH_mZA  
  DDX_Control(pDX, IDC_KEY, m_Key); 7lH.>n  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); u|Tg*B  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ZR*Dl.GWY  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); g~v>{F+u  
  DDX_Text(pDX, IDC_PATH, m_Path); ,?KN;~t#vz  
  DDX_Text(pDX, IDC_NUMBER, m_Number); +>BD^[^^  
 //}}AFX_DATA_MAP MRb6O!$`C  
} h3YWqSj  
wj$WE3Y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 4COo~d  
//{{AFX_MSG_MAP(CCaptureDlg) hVl^vw7o  
 ON_WM_SYSCOMMAND() gc[BP>tl\  
 ON_WM_PAINT() =}xH6^It  
 ON_WM_QUERYDRAGICON() py':UQS*q  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) qHf8z;lc  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) p3W-*lE  
 ON_BN_CLICKED(ID_CHANGE, OnChange) |qq7vx  
//}}AFX_MSG_MAP Js0hlWu  
END_MESSAGE_MAP() "74Rn"d5  
Kd|@  
BOOL CCaptureDlg::OnInitDialog() RK\$>KFE  
{ &~&nJr  
 CDialog::OnInitDialog(); ?(2^lH~6h  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Q G8X{'  
 ASSERT(IDM_ABOUTBOX < 0xF000); *,y .%`o  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 7@u:F?c  
 if (pSysMenu != NULL) 'g#EBy  
 { 6_zyPh  
  CString strAboutMenu; .% {4B,d$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 0w9[Z  
  if (!strAboutMenu.IsEmpty()) Og E<bw  
  { ;UPI%DnE]  
   pSysMenu->AppendMenu(MF_SEPARATOR); gQ;1SY!  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v$]eCj'  
  } 0NFYFd-50  
 } UgC{  
 SetIcon(m_hIcon, TRUE); // Set big icon gBPYGci2F  
 SetIcon(m_hIcon, FALSE); // Set small icon Sf"]enwB  
 m_Key.SetCurSel(0); w\`u |f;Aq  
 RegisterHotkey(); < /\y<]b  
 CMenu* pMenu=GetSystemMenu(FALSE); ;Svs|]d  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); eW/sP Q-  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); n/vKxtW  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6U?z  
 return TRUE; // return TRUE unless you set the focus to a control grbUR)f<?-  
} ?_BK(kL_  
yRtxh_wr9  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [7sy}UH  
{ T^1]|P  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 1J?x2  
 { 89+Q^79m  
  CAboutDlg dlgAbout; & G8tb>q<V  
  dlgAbout.DoModal(); #Ks2a):8  
 } N799@:.  
 else Y-y<gW  
 { 9yWQ}h  
  CDialog::OnSysCommand(nID, lParam); >j}.~$6dj_  
 } m6iQB\ \  
} e)): U  
d7i 0'R  
void CCaptureDlg::OnPaint() W,-fnJk  
{ kr{eC/Q"  
 if (IsIconic()) J{qpGRQNa  
 { m)oGeD( !  
  CPaintDC dc(this); // device context for painting G~FAChI8![  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); sUTfY|<7|  
  // Center icon in client rectangle }MCJ$=5  
  int cxIcon = GetSystemMetrics(SM_CXICON); Lju)q6  
  int cyIcon = GetSystemMetrics(SM_CYICON); x17K8De  
  CRect rect; P8\bi"iiN  
  GetClientRect(&rect); @/ G$ C9<  
  int x = (rect.Width() - cxIcon + 1) / 2; )4CF*>*6V  
  int y = (rect.Height() - cyIcon + 1) / 2; TD6MP9L  
  // Draw the icon s!eB8lkcT  
  dc.DrawIcon(x, y, m_hIcon); 9%6W_ 0>  
 } %5rC`9^  
 else c@<vFoq  
 { _X"G(  
  CDialog::OnPaint(); Y2 QX9RN  
 } n[tES6u  
} H;k-@J  
9S! 2r  
HCURSOR CCaptureDlg::OnQueryDragIcon() #a|.cm>6  
{ '~;vp  
 return (HCURSOR) m_hIcon; S :%SarhBD  
} *fg|HH+i  
BE LxaV,  
void CCaptureDlg::OnCancel() p8_ CY[U  
{ y~-dQ7r  
 if(bTray) Yj#4{2A  
  DeleteIcon(); C[IY9s:Pf  
  CDialog::OnCancel(); SQ0t28N3h  
} #dEMjD  
&* 1iW(x  
void CCaptureDlg::OnAbout() ^!yJ;'H\  
{ } Rs@  
 CAboutDlg dlg; ]O1}q!s   
 dlg.DoModal(); z(JDLd  
} /\e&nYz  
f'Cx %  
void CCaptureDlg::OnBrowse() b@  S.  
{ Z`{ZV5  
 CString str; G.y~*5?#  
 BROWSEINFO bi; .!Qo+(  
 char name[MAX_PATH]; +#=l{_Z,ZJ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 4 /Q4sE~<  
 bi.hwndOwner=GetSafeHwnd(); ed:[^#Lj  
 bi.pszDisplayName=name; i3v|r 0O~L  
 bi.lpszTitle="Select folder"; "o6a{KY(  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; jt,dr3|/n  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); X\ bXat+  
 if(idl==NULL) Uk@'[_1z  
  return; }<KQ +  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); nLcOz3h  
 str.ReleaseBuffer(); K%iA-h  
 m_Path=str; KVA~|j B  
 if(str.GetAt(str.GetLength()-1)!='\\') AttS?TZr  
  m_Path+="\\"; /@`kM'1:  
 UpdateData(FALSE); D g~L"  
} Z @d(0 z  
B>Xfs ZS  
void CCaptureDlg::SaveBmp()  V9cKl[  
{ =}^J6+TVL  
 CDC dc; P{ HYZg  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); RI</T3%~  
 CBitmap bm; +q-/~G'  
 int Width=GetSystemMetrics(SM_CXSCREEN); K]s*rPT/,  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~4'AnoD1w  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0oiz V;B5%  
 CDC tdc; 1p }:K`#{  
 tdc.CreateCompatibleDC(&dc);  QnN cGH  
 CBitmap*pOld=tdc.SelectObject(&bm); !,z ==Qp|v  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); N,F$^ q6  
 tdc.SelectObject(pOld); d@aPhzLu  
 BITMAP btm; e_Un:r@)  
 bm.GetBitmap(&btm); @?E|]H!S]  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; lS!uL9t.  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); %{*)-_M  
 BITMAPINFOHEADER bih; 4Ow0g-{  
 bih.biBitCount=btm.bmBitsPixel; IqrT@jgN-  
 bih.biClrImportant=0; z [9f  
 bih.biClrUsed=0; '#Pg:v_  
 bih.biCompression=0; W< sa6,$  
 bih.biHeight=btm.bmHeight; (W'.vEl  
 bih.biPlanes=1; RjW< H6a"K  
 bih.biSize=sizeof(BITMAPINFOHEADER); I/V lH:o  
 bih.biSizeImage=size; EnD }|9  
 bih.biWidth=btm.bmWidth; .{ +Ob i  
 bih.biXPelsPerMeter=0; KYN{Dh]-}  
 bih.biYPelsPerMeter=0; r< ~pSj  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); '7;b+Vbl#  
 static int filecount=0; ZA{T0:  
 CString name; Q-7C'|  
 name.Format("pict%04d.bmp",filecount++); B;=-h(E}vJ  
 name=m_Path+name; zC<k4[.  
 BITMAPFILEHEADER bfh; Fh0cOp(  
 bfh.bfReserved1=bfh.bfReserved2=0; U\~9YX8  
 bfh.bfType=((WORD)('M'<< 8)|'B'); GX-V|hLaGX  
 bfh.bfSize=54+size; oTLA&dy@  
 bfh.bfOffBits=54; .m/$ku{/J  
 CFile bf; `j)S7KN  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ L$rMfe S  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); SNl% ?j| f  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); E=eK(t(8  
  bf.WriteHuge(lpData,size); noL&>G  
  bf.Close(); pN?geF~t|  
  nCount++; ]~!?(d!J/  
 } Al-;-t#Dc  
 GlobalFreePtr(lpData); YRRsbm{  
 if(nCount==1) s. ]<r5v7  
  m_Number.Format("%d picture captured.",nCount); %3;vDB*L$  
 else O}w"@gO@.  
  m_Number.Format("%d pictures captured.",nCount); BWG*UjP M  
  UpdateData(FALSE); "J (0J  
} C(@#I7G  
r=74 'g  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) (u:^4,Z  
{ 'ugc=-0pd  
 if(pMsg -> message == WM_KEYDOWN) 0tb%h[%,M  
 { +0Z,#b  
  if(pMsg -> wParam == VK_ESCAPE) J,SP1-L  
   return TRUE; ]qpLaBD  
  if(pMsg -> wParam == VK_RETURN) e:uk``\  
   return TRUE; ~dz,eB  
 } 2uZ4$_  
 return CDialog::PreTranslateMessage(pMsg); R q |,@  
} {Uj-x -  
)F,IPAA#  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) nkTpUbS'f?  
{ u(W+hdTap=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ wY'w'%A?  
  SaveBmp(); ?_V&~?r   
  return FALSE; 1XXuFa&  
} uw>O|&!  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ d.3cd40Q  
 CMenu pop; Q /zlU@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;eY.4/*R  
 CMenu*pMenu=pop.GetSubMenu(0); !> 2kH  
 pMenu->SetDefaultItem(ID_EXITICON); E>I\m!ue  
 CPoint pt; )Bw}T  
 GetCursorPos(&pt); rZ#ZY  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); HzQ Y\Y6  
 if(id==ID_EXITICON) iKM!>Fi  
  DeleteIcon(); {'@`: p&3r  
 else if(id==ID_EXIT) $s]vZ(H  
  OnCancel(); ZULnS*V;5  
 return FALSE; iO@UzD #v  
} RzOcz=A}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); tN1xZW:  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) fPBJ%SZ  
 AddIcon(); Uu_Es{@  
 return res; @ Cd#\D|  
} }5]2tH${  
uEui{_2$  
void CCaptureDlg::AddIcon() {$xt.<  
{ NXHe;G  
 NOTIFYICONDATA data; u8Ak2:   
 data.cbSize=sizeof(NOTIFYICONDATA); \` U=pZJ  
 CString tip; XT%\Ce!  
 tip.LoadString(IDS_ICONTIP); r\T'_wo  
 data.hIcon=GetIcon(0); /nWBol,  
 data.hWnd=GetSafeHwnd(); SUC'o"  
 strcpy(data.szTip,tip); fvBL? x  
 data.uCallbackMessage=IDM_SHELL; f"RS,]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; H ]z83:Z  
 data.uID=98; m"/ o4  
 Shell_NotifyIcon(NIM_ADD,&data); L.?QZN%cN  
 ShowWindow(SW_HIDE); s C>Oyh:%!  
 bTray=TRUE; W"n0x8~sV  
} K 7 OIT2-  
F87/p  
void CCaptureDlg::DeleteIcon() urhOvC$a  
{ A@<a')#>)  
 NOTIFYICONDATA data; ?Gqq]ozm  
 data.cbSize=sizeof(NOTIFYICONDATA); z3Zo64V~7  
 data.hWnd=GetSafeHwnd(); Q].p/-[(  
 data.uID=98; (Cb;=:3G  
 Shell_NotifyIcon(NIM_DELETE,&data); \"pp-str  
 ShowWindow(SW_SHOW); /Os6i&;  
 SetForegroundWindow(); A9_} RJ9  
 ShowWindow(SW_SHOWNORMAL); !9t,#?!  
 bTray=FALSE; WCD)yTg:ES  
} z50P* eS  
2!Qg1hM  
void CCaptureDlg::OnChange() Xti.yQx\  
{ rU9z? (  
 RegisterHotkey(); ["^? vhv  
} $uUR@l  
%jJ|4\  
BOOL CCaptureDlg::RegisterHotkey() $a'}7Q_  
{ RJ1 @ a  
 UpdateData(); Dbu>rESz  
 UCHAR mask=0; ]?%S0DO*  
 UCHAR key=0; g{^~g  
 if(m_bControl) +Ly@5y"  
  mask|=4; 19b@QgfWpb  
 if(m_bAlt) es^@C9qt  
  mask|=2; 74r$)\q  
 if(m_bShift) FrC)2wX  
  mask|=1; P W_"JZ  
  key=Key_Table[m_Key.GetCurSel()]; `gAW5 i-z5  
 if(bRegistered){ Z`<5SHQd  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); bH.SUd)  
  bRegistered=FALSE; UZpQ%~/  
 } 3 <)+)n  
 cMask=mask; Z 4QL&?U  
 cKey=key; R-YNg  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); A<_{7F9  
 return bRegistered; <?>tjCg'  
} o~7D=d?R  
Tq?7-_MLC$  
  四、小结 5=#2@qp  
$5:I~ -mx  
  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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