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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: '[M^f+H|  
  d'Ik@D]I  
  一、实现方法 Xh7~MU~X  
YJ$Vn >6Z  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: +WU|sAK"  
IF36K^K  
#pragma data_seg("shareddata") `uM0,Z  
HHOOK hHook =NULL; //钩子句柄 6)uPM"cO  
UINT nHookCount =0; //挂接的程序数目 !i~x"1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 g~ppPAH  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 n,Yr!W:h  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?[hy|r6$  
static int KeyCount =0; 2 0Cie q  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 oPBg+Bh*  
#pragma data_seg() yKe*<\  
&(H)gjH  
  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。 `PQ?8z|  
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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: V#-qKV  
9QX ~a X  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR P*0nT  
cKey,UCHAR cMask) z'\}/k+  
{ [0tf Y0  
 BOOL bAdded=FALSE; m>*A0&??[  
 for(int index=0;index<MAX_KEY;index++){ $p}~,Kp/  
  if(hCallWnd[index]==0){ $$bTd3N+  
   hCallWnd[index]=hWnd; w$(0V$l_  
   HotKey[index]=cKey; P- `~]]  
   HotKeyMask[index]=cMask; 1a=9z'8V  
   bAdded=TRUE; 'Tru?y \  
   KeyCount++; ATMogxh  
   break; Tjeo*n^  
  } |;U}'|6  
 } IQk#  
 return bAdded; @sg T[P*ut  
} *1o+o$hY2  
//删除热键 4B3irHs\Q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >^a"Z[s[  
{ bD-/ZZz  
 BOOL bRemoved=FALSE; UgD'Bi  
 for(int index=0;index<MAX_KEY;index++){ JK:mQ_  
  if(hCallWnd[index]==hWnd){ mNnw G);$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ qj3bt_F!x  
    hCallWnd[index]=NULL; lEYT{  
    HotKey[index]=0; ~J. Fl[  
    HotKeyMask[index]=0; Vk N[=0a,  
    bRemoved=TRUE; <*r<+S   
    KeyCount--; }n2-*{)x  
    break; IioE<wS)  
   } |W~V@n8"6  
  } {!{7zM%u0C  
 } f,`}hFD  
 return bRemoved; /n(bThDH  
}  i_E#cU  
\@}$Wjsl  
O)RzNfI^`N  
  DLL中的钩子函数如下: JV?RgFy  
TOPPa?=vk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) F~Z 0  
{ [K)1!KK,L  
 BOOL bProcessed=FALSE; H/@M  
 if(HC_ACTION==nCode) ,@'){V  
 { LD~uI  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 QIMv9;  
   switch(wParam) +U_-Lq )  
   {  \xO2WD  
    case VK_MENU: X!+Mgh6  
     MaskBits&=~ALTBIT; |B{$URu  
     break; ,5A>:2 zs  
    case VK_CONTROL: "{ QHWZ  
     MaskBits&=~CTRLBIT; Nh\8+v*+{  
     break; N>}K+M>  
    case VK_SHIFT: n;k97>m${x  
     MaskBits&=~SHIFTBIT; [P&,}o)+E0  
     break; ~4~Tcn  
    default: //judge the key and send message #G!Adj+p5  
     break; 'MdE}  
   } t zW<&^  
   for(int index=0;index<MAX_KEY;index++){ l-^XW?CfL  
    if(hCallWnd[index]==NULL) H;t8(-F@'  
     continue; $vGEY7,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) iq^L~RW5e  
    { :UhFou_D4l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6kF uMtjc  
     bProcessed=TRUE; 4gv XJK-  
    } 'G3OZj8  
   }  > ^v8N  
  } u$%#5_k  
  else if((lParam&0xc000ffff)==1){ //有键按下 [A..<[  
   switch(wParam) |phWK^   
   { (Y.$wMB  
    case VK_MENU: <<2b2?a S`  
     MaskBits|=ALTBIT; >KClH'R2  
     break; qnfRN'  
    case VK_CONTROL: A%m `LKV~@  
     MaskBits|=CTRLBIT; )p^jsv.  
     break; 1uge>o&  
    case VK_SHIFT: 7SY->-H8  
     MaskBits|=SHIFTBIT; rLw[y$2  
     break; ep}/dBg  
    default: //judge the key and send message dYqDL<se/I  
     break; +81+4{*  
   } ][5p.owJse  
   for(int index=0;index<MAX_KEY;index++){ 8rG&CxI  
    if(hCallWnd[index]==NULL) ?jn6Op  
     continue; 8(_g]u#B;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $9i5<16  
    { iBiA0 W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5B.??;xtaV  
     bProcessed=TRUE; F",abp!  
    } 9MzkG87J  
   } POg0=32  
  } JdYF&~  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |16BidWi  
   for(int index=0;index<MAX_KEY;index++){ N evvA(M  
    if(hCallWnd[index]==NULL) @[b:([  
     continue; ty< tv|p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .sR&9FH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D_ZBx+/_?  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 S,tVOxs^  
   } o>A%}YU  
  } \HQb#f,  
 } Y&Lk4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); WfbNar[  
} !6/IKh`J  
t02"v4_i  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: g+/U^JIc4l  
3N%Ev o  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =i5:*J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); UuqnL{  
FHcqu_;J  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: .x$T a l  
/~rO2]rZ@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v8k ^=A:  
{ *4^]?Y\*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) BG8)bh k;/  
 { 0o=)&%G  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 / bu<,o  
  SaveBmp();  ;yER V  
  return FALSE; ^-;Z8M  
 } XXwhs-:o  
 …… //其它处理及默认处理 q vVZA*  
} x7 1!r  
Xsn- +e  
gwz _b  
  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。 udy;Odt  
q4ko}jn  
  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。 %dU'$)  
=+=|{l?F  
  二、编程步骤 7%}3Ghc%  
DJ [#H  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; f EiEfu  
!cq| g  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Tc(v\|F,  
r= | |sZs  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; BBJ]>lQ  
:::f,aCAu  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; +\oHQ=s>}\  
molowPI  
  5、 添加代码,编译运行程序。 uv!qE1z@':  
!X <n:J  
三、程序代码 KJC9^BAr  
v 4b`19}  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL d1La7|43u  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Aq]'.J =4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~JPzjE  
#if _MSC_VER > 1000 i@^`~vj  
#pragma once <0 idG  
#endif // _MSC_VER > 1000 4KSN;G  
#ifndef __AFXWIN_H__ FH21mwV  
#error include 'stdafx.h' before including this file for PCH J<*Mk  
#endif RcM0VbR"EU  
#include "resource.h" // main symbols vm^# aoDB  
class CHookApp : public CWinApp B@vH1T  
{ ,:4w$!;  
 public: @VS5Mg8  
  CHookApp(); knzED~ v@(  
  // Overrides 7[1 R}G V  
  // ClassWizard generated virtual function overrides )t ch>.EQ_  
  //{{AFX_VIRTUAL(CHookApp) 0i `Zy!  
 public: ^JDV4>S\  
  virtual BOOL InitInstance(); <d`UifqD  
  virtual int ExitInstance(); ~2}ICU5  
  //}}AFX_VIRTUAL [:S F(*}  
  //{{AFX_MSG(CHookApp) FOG+[v  
  // NOTE - the ClassWizard will add and remove member functions here. L [M8[~Hy  
  // DO NOT EDIT what you see in these blocks of generated code ! {$:13AnK   
  //}}AFX_MSG x2wWp-Z  
  DECLARE_MESSAGE_MAP() '|?r&-5 h  
}; =xet+;~ji  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Zs|sPatV<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \)uad5`N  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w|o@r%Q#l  
BOOL InitHotkey(); 1AV1W_"  
BOOL UnInit(); ^v5hr>m  
#endif [te7 uZv-  
5g2+Ar(  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ]LOtwY  
#include "stdafx.h" }jgAV  
#include "hook.h" : {Z^ _;Tf  
#include <windowsx.h> p&l:937  
#ifdef _DEBUG ]qHO{b4k  
#define new DEBUG_NEW deY<+!  
#undef THIS_FILE 2A ,36,  
static char THIS_FILE[] = __FILE__; pdiZ"pe  
#endif K3D $ hb  
#define MAX_KEY 100 '+zsj0!A  
#define CTRLBIT 0x04 Jz0S2&  
#define ALTBIT 0x02 tp2 _OQAQ  
#define SHIFTBIT 0x01 KptLeb:Om  
#pragma data_seg("shareddata") .. TjEBp  
HHOOK hHook =NULL; YDD]n*&  
UINT nHookCount =0; ADz|Y~V!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey s7} )4.vO  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -- FtFo  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ,peE'   
static int KeyCount =0; C$gLi8|m  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift GTNTx5H  
#pragma data_seg() bC-x`a@  
HINSTANCE hins; 2Hwf:S'  
void VerifyWindow(); Tou~U[V+  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) hI{Yg$H1  
//{{AFX_MSG_MAP(CHookApp) 3U$fMLx]k  
// NOTE - the ClassWizard will add and remove mapping macros here. xyz86r ^u  
// DO NOT EDIT what you see in these blocks of generated code! v72 dE  
//}}AFX_MSG_MAP (Z +C  
END_MESSAGE_MAP() ,SwaDWNO  
<);u]0  
CHookApp::CHookApp() Ec 7M'~1  
{ h8Si,W 3o  
 // TODO: add construction code here, >GUTno$J  
 // Place all significant initialization in InitInstance lGhUfhk  
} V%=t2+  
9 <m j@bI$  
CHookApp theApp; GqxK|G1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?%ntO]  
{ x=N;>  
 BOOL bProcessed=FALSE; 1<|I[EI  
 if(HC_ACTION==nCode) P[i/o#  
 { P@?CQvMx  
  if((lParam&0xc0000000)==0xc0000000){// Key up ':$a6f &T  
   switch(wParam) eqCB2u"Jq  
   { R"([Y#>m  
    case VK_MENU: ?0Zw ^a  
     MaskBits&=~ALTBIT; _ 0E,@[  
     break; xII!2.  
    case VK_CONTROL: ]XyJ7esg  
     MaskBits&=~CTRLBIT; i`L66uV  
     break; {rLOAewr  
    case VK_SHIFT: )&-E@% \  
     MaskBits&=~SHIFTBIT; nQ~L.V  
     break; S:QEHd_C  
    default: //judge the key and send message ?K 0V#aq  
     break; 4*X$Jle|  
   } .X1niguXH  
   for(int index=0;index<MAX_KEY;index++){ V485Yn!$(  
    if(hCallWnd[index]==NULL) (5&"Y?#o,  
     continue; +Ti@M1A&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j"s(?  
    { 2Wtfx" .y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8t!"K_Mkx  
     bProcessed=TRUE; #u@!O%MJ  
    } cTp+M L  
   } bxq`E!]  
  } l !v#6#iq  
  else if((lParam&0xc000ffff)==1){ //Key down v^ G5 N)F  
   switch(wParam) ?VsZo6Z"  
   { ERjf.7)d  
    case VK_MENU: D(|$6J 0  
     MaskBits|=ALTBIT; E@KK\m \e  
     break; lUd,-  
    case VK_CONTROL: N0C5FSH  
     MaskBits|=CTRLBIT; rC16?RovQ@  
     break; -X \v B  
    case VK_SHIFT: 7F\g3^ z9`  
     MaskBits|=SHIFTBIT; oR)7 \;g  
     break; i,T{SV  
    default: //judge the key and send message N0PX<$y  
     break; [~wcHE  
   } dM$S|, H  
   for(int index=0;index<MAX_KEY;index++) M(f'qFY=K  
   { QNFrkel  
    if(hCallWnd[index]==NULL) VuW19-G  
     continue; r_m&Jl@4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [:qX3"B  
    { ?M2@[w8_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?dYDfyFfB  
     bProcessed=TRUE; sx\7Z#|  
    } ^*OA%wg3=h  
   } [&:oS35O  
  } n>UvRn.7kz  
  if(!bProcessed){ D=Y HJ>-wB  
   for(int index=0;index<MAX_KEY;index++){ jBbc$|O4SY  
    if(hCallWnd[index]==NULL) x;Q2/YZ#  
     continue; uItKsu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) hlZjk0ez  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); J4i0+u  
   } /'&L M\  
  } H@:@zD!G[  
 } ;21JM2JI8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \Wk$>?+#@  
} JV>OmUAk  
Wwz{98,K  
BOOL InitHotkey() -j,o:ng0  
{ }1wuH  
 if(hHook!=NULL){ L  z  
  nHookCount++; VbYapPu4b!  
  return TRUE; ->(B: Cz  
 } _G|6xlO  
 else 1Rh&04O>VL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); t JP(eaqZ  
  if(hHook!=NULL) \!3='~2:=o  
   nHookCount++; j3>< J  
  return (hHook!=NULL); o%a$m9I  
} 3'wBX  
BOOL UnInit() M*N8p]3Cq  
{ )UJMmw\  
 if(nHookCount>1){ D[mYrWHpn  
  nHookCount--; mq L+W  
  return TRUE; <#-ERQw  
 } 5cU8GgN`  
 BOOL unhooked = UnhookWindowsHookEx(hHook); g2I@j3  
 if(unhooked==TRUE){ :>k\uW  
  nHookCount=0; Sy_M!`B  
  hHook=NULL; ^BZdR<;  
 } sMx\WTyz  
 return unhooked; "`k[ 4C  
} ]{hfM  
]nh)FMo  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {`LV{ !  
{ f8lww)^,v  
 BOOL bAdded=FALSE; e+mD$(h  
 for(int index=0;index<MAX_KEY;index++){ 809-p_)B  
  if(hCallWnd[index]==0){ kAoai|m@R  
   hCallWnd[index]=hWnd; R/W&~t  
   HotKey[index]=cKey; sIpK@BQ'  
   HotKeyMask[index]=cMask; 3A5" %  
   bAdded=TRUE; ;g9+*$Gw  
   KeyCount++; ;#due  
   break; bQ%^l#H_n'  
  } `W9_LROD  
 }  ulQE{c[  
 return bAdded; R+\5hI@ >i  
} };*5+XY^  
iq#Z\Y(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T1E=<q4  
{ - M]C-$  
 BOOL bRemoved=FALSE; Vk"QcW  
 for(int index=0;index<MAX_KEY;index++){ = 4If7  
  if(hCallWnd[index]==hWnd){ [,dsV d  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :MVD83?4  
    hCallWnd[index]=NULL; 1gC=xMAT  
    HotKey[index]=0; b+3pu\w `  
    HotKeyMask[index]=0; .jCdJ =z  
    bRemoved=TRUE; 4ZIXG,@mZJ  
    KeyCount--; &}]Wbk4:  
    break; )JPcSy*  
   } Wg[`H=)Q  
  } t`?FSV  
 } Q7C'O @  
 return bRemoved; &Wba2fD  
} D|xSO~M5  
pnD#RvmW2e  
void VerifyWindow() .f}I$ "2  
{ 'BC-'Ot  
 for(int i=0;i<MAX_KEY;i++){ Y9WH%  
  if(hCallWnd!=NULL){ Gi-tf<  
   if(!IsWindow(hCallWnd)){ UX?_IgJh<"  
    hCallWnd=NULL; 0V^?~ex  
    HotKey=0; #E#70vWp\O  
    HotKeyMask=0; -+L1Hid.7  
    KeyCount--; <AVpFy  
   } W`Soa&9  
  } ZA!vxQ?P,  
 } Q~9:}_@  
} v1} $FmHL"  
mp#5V c  
BOOL CHookApp::InitInstance() . &e,8  
{ Y/ `fPgE  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); G/y< bPQ  
 hins=AfxGetInstanceHandle(); GXAcy OV  
 InitHotkey(); Uz0mSfBp  
 return CWinApp::InitInstance(); G -;Yua2\  
} ]?kf;A@  
e1H.2n{y^  
int CHookApp::ExitInstance() K= 69z  
{ ~"-wSAm  
 VerifyWindow(); sB6UlX;b:  
 UnInit(); .(sT?M`\J  
 return CWinApp::ExitInstance(); (i`DUF'#y  
} ,Zdc  
s:jwwE2  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file HJ2]xe09  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *mYec~  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ eq"~by[Uq  
#if _MSC_VER > 1000 {PfE7KH  
#pragma once wtY#8 '^$&  
#endif // _MSC_VER > 1000 lU@ni(69d  
B *:6U+I  
class CCaptureDlg : public CDialog ^x q%P2s0  
{ 03,+uf  
 // Construction Q>.-u6(&  
 public: Y4i-Pp?  
  BOOL bTray; 4[6A~iC_  
  BOOL bRegistered; '\9A78NV{;  
  BOOL RegisterHotkey(); $rdA0%;  
  UCHAR cKey; `Z{7Ut^)  
  UCHAR cMask; UZ<!(g.  
  void DeleteIcon(); _uRgKoiy  
  void AddIcon(); W4Eo1 E  
  UINT nCount; 'Ct+0X:D  
  void SaveBmp(); k\EMO\je  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?J>^X-z  
  // Dialog Data 5!?><{k=%  
  //{{AFX_DATA(CCaptureDlg) 6Up,B=sX0  
  enum { IDD = IDD_CAPTURE_DIALOG }; w_9:gprf  
  CComboBox m_Key; 5SDHZ?h  
  BOOL m_bControl; j"c"sF\q  
  BOOL m_bAlt; r`" ?K]rI  
  BOOL m_bShift; b2Ct^`|M5  
  CString m_Path; kcQ |Zg  
  CString m_Number;  Jl}$) '  
  //}}AFX_DATA 'j}%ec1  
  // ClassWizard generated virtual function overrides zRB1V99k  
  //{{AFX_VIRTUAL(CCaptureDlg) bJ9>,,D  
 public: GwpJxiFgk  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 0.?|%;^ib  
 protected: FO*Py)/rX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Nf3L  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); qD%Jf4.0j  
  //}}AFX_VIRTUAL W1Ht8uYG3  
  // Implementation /9 [nogP  
 protected: eX}uZR  
  HICON m_hIcon; 9#1lxT4%  
  // Generated message map functions B=9|g1e  
  //{{AFX_MSG(CCaptureDlg) |vzGFfRI  
  virtual BOOL OnInitDialog(); $ZE OE8.\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); +lE 9*Gs_$  
  afx_msg void OnPaint(); 1(C%/g#"  
  afx_msg HCURSOR OnQueryDragIcon(); }4+S_b  
  virtual void OnCancel(); 1MOQ/N2BR  
  afx_msg void OnAbout(); C,K P!B{  
  afx_msg void OnBrowse(); Zr`:A$  
  afx_msg void OnChange(); N2C^'dFj  
 //}}AFX_MSG W[+E5I  
 DECLARE_MESSAGE_MAP() oZ!rK/qoA  
}; 4j/8Otn  
#endif \p.ku%{  
$NqT ={!  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file MvObx'+  
#include "stdafx.h" !k&<  
#include "Capture.h" xAsbP$J:  
#include "CaptureDlg.h" Ww@R ewo  
#include <windowsx.h> zX(p\NU  
#pragma comment(lib,"hook.lib") X1$0'u sS  
#ifdef _DEBUG :eDwkzlHH  
#define new DEBUG_NEW H+-9R  
#undef THIS_FILE t + Fm?  
static char THIS_FILE[] = __FILE__; pnDD9u-4;  
#endif 7ej"q  
#define IDM_SHELL WM_USER+1 LR}b^QU7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3TO$J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Xa+ u>1"2"  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Ao 1*a%-.  
class CAboutDlg : public CDialog DaaLRMQ=  
{ Haiuf)a  
 public: 3%'$AM}+s  
  CAboutDlg(); 6f0 WN  
  // Dialog Data NO"=\Zn6  
  //{{AFX_DATA(CAboutDlg) HJM-;C](  
  enum { IDD = IDD_ABOUTBOX }; ]*Zg(YA  
  //}}AFX_DATA jF{zcYU  
  // ClassWizard generated virtual function overrides Z&YW9de@  
  //{{AFX_VIRTUAL(CAboutDlg) jFnq{L t  
 protected: 9V("K  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support A{Pp`*l  
  //}}AFX_VIRTUAL $5|/X&"O)/  
  // Implementation D24@lZ`g~  
 protected: YWjw`,EA(  
  //{{AFX_MSG(CAboutDlg) ,+%$vV .g\  
  //}}AFX_MSG 8D)2/$NsY}  
  DECLARE_MESSAGE_MAP() #\o VbVq  
}; 3-srt^>w*  
7zT]\AnO  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %6HDLG6@^}  
{ 6 C;??Y>b  
 //{{AFX_DATA_INIT(CAboutDlg) L<*wzl2Go  
 //}}AFX_DATA_INIT or>5a9pj  
} *tO7A$LDT  
nO2-fW:9]  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) o|(-0mWBQA  
{ C%0|o/Wi  
 CDialog::DoDataExchange(pDX); <e)3 j6F!  
 //{{AFX_DATA_MAP(CAboutDlg) &p`RKD  
 //}}AFX_DATA_MAP 5 J61PuH   
} [@_}BZk  
!ai, \  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;)~loa1\  
 //{{AFX_MSG_MAP(CAboutDlg) m^%[  
 // No message handlers +.NopI3:  
 //}}AFX_MSG_MAP f_7a) 'V4  
END_MESSAGE_MAP() +hqsIx  
-BgzAxa  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -(ABQgSO]  
: CDialog(CCaptureDlg::IDD, pParent) Gr}Lp  
{ s=#3f3  
 //{{AFX_DATA_INIT(CCaptureDlg) CUaI66  
  m_bControl = FALSE; 7xz|u\?_2  
  m_bAlt = FALSE; ?(n|ykXwc  
  m_bShift = FALSE; la[xbv   
  m_Path = _T("c:\\"); [0w @0?[  
  m_Number = _T("0 picture captured."); `c ^2  
  nCount=0; }L3kpw  
  bRegistered=FALSE; N{ @B@]  
  bTray=FALSE; D<]z.33  
 //}}AFX_DATA_INIT -P^ 6b(  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 gyondcF  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -tlRe12  
} ZC@sUj"  
]=m '| 0}  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) udMDE=1~L  
{ V \,Z (  
 CDialog::DoDataExchange(pDX); _t_X`  
 //{{AFX_DATA_MAP(CCaptureDlg) ^Bf@ I  
  DDX_Control(pDX, IDC_KEY, m_Key); VZ 5EV'D8!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); j ~:Dr   
  DDX_Check(pDX, IDC_ALT, m_bAlt); m$Lq#R={Z  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); }1f@>'o  
  DDX_Text(pDX, IDC_PATH, m_Path); m(L]R(t  
  DDX_Text(pDX, IDC_NUMBER, m_Number);  LkD$\i  
 //}}AFX_DATA_MAP D9*GS_K2 t  
} 4N|^Joi  
M1^,g~e  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) )4vZIU#  
//{{AFX_MSG_MAP(CCaptureDlg) 9s8B>(L  
 ON_WM_SYSCOMMAND() prV:Kq;O  
 ON_WM_PAINT() PqZMuUd  
 ON_WM_QUERYDRAGICON() Es/\/vF7]D  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) DJ2EV^D+P  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) iP6$;Y{ZA  
 ON_BN_CLICKED(ID_CHANGE, OnChange) M}kt q)  
//}}AFX_MSG_MAP u_[s+ J/  
END_MESSAGE_MAP() {L$]NQdz  
W9D]s~bO;  
BOOL CCaptureDlg::OnInitDialog() ?6P P_QY  
{ QWp,(Mv:r  
 CDialog::OnInitDialog(); nlQ<Aa-%  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); C0|<+3uND=  
 ASSERT(IDM_ABOUTBOX < 0xF000); '5\7>2fI  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @kw#\%Uz  
 if (pSysMenu != NULL) 7@NAky(  
 { 7aUk?Hf  
  CString strAboutMenu; {+_ pyL  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ^Qt4}V=  
  if (!strAboutMenu.IsEmpty()) AL74q[>  
  { .H {  
   pSysMenu->AppendMenu(MF_SEPARATOR); FIG3P))  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); s-!Bpr16o0  
  } Av:5v3%  
 } {{7%z4l  
 SetIcon(m_hIcon, TRUE); // Set big icon %]S~PKx  
 SetIcon(m_hIcon, FALSE); // Set small icon 2It$ bz  
 m_Key.SetCurSel(0); (vMC.y5  
 RegisterHotkey(); wg\*FfQn  
 CMenu* pMenu=GetSystemMenu(FALSE); yJkERiJV  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); RsIR}.*  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); B#9rqC  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Z[[ou?c  
 return TRUE; // return TRUE unless you set the focus to a control cLj@+?/  
} O:cta/M  
^|M\vO  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) TO7%TW{L  
{ !*_5 B'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) v<c~ '?YzO  
 { Bt[OGa(q  
  CAboutDlg dlgAbout; }>Gnp c  
  dlgAbout.DoModal(); P~$FgAV  
 } {h5 S=b  
 else ;O5p>o  
 { l3dGe'  
  CDialog::OnSysCommand(nID, lParam); RG1~)5AL~Y  
 } I?nj_ as  
} (;T$[ru`  
RLBjl%Q>  
void CCaptureDlg::OnPaint() PYX]ld.E  
{ WX$mAQDV  
 if (IsIconic()) 28J ; 9  
 { 4)./d2/E  
  CPaintDC dc(this); // device context for painting x;ym_UZ6e  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \' (_r  
  // Center icon in client rectangle iTJSW  
  int cxIcon = GetSystemMetrics(SM_CXICON); t>p!qKrE'J  
  int cyIcon = GetSystemMetrics(SM_CYICON); g"gh2#!D  
  CRect rect; GInU7y904  
  GetClientRect(&rect); teh$W<C  
  int x = (rect.Width() - cxIcon + 1) / 2; jsL\{I^>  
  int y = (rect.Height() - cyIcon + 1) / 2; HL-zuZa`Ju  
  // Draw the icon YcW[BMy5h  
  dc.DrawIcon(x, y, m_hIcon); gU1E6V-Jm  
 } mVFz[xI  
 else $xqI3UaX  
 { <Hw)},_*  
  CDialog::OnPaint(); %"Tn=fZIF  
 } 7A'd55I4  
} 72@lDY4cE  
c#X9d8>  
HCURSOR CCaptureDlg::OnQueryDragIcon() +rse,b&U(  
{ | d}f\a`  
 return (HCURSOR) m_hIcon; MN1 kR  
} kNqSBzg  
{?tK]g#  
void CCaptureDlg::OnCancel() mNS7/I\  
{ o;bK 7D  
 if(bTray) l1BbL5#1Q>  
  DeleteIcon(); JQ|qg\[  
  CDialog::OnCancel(); _q*4+x  
} Du@?j7&l=$  
:l<)p;\  
void CCaptureDlg::OnAbout() r_/=iYYJ  
{ _hT-5)1r  
 CAboutDlg dlg; 5A(zQ'6  
 dlg.DoModal(); gx+bKGB`  
} \z"0lAv"  
$U=E7JO  
void CCaptureDlg::OnBrowse() GCSR)i|  
{ Bc%A aZ0x  
 CString str; +%vBDcf  
 BROWSEINFO bi; +c&n7  
 char name[MAX_PATH]; i oCoFj  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 6f1%5&si  
 bi.hwndOwner=GetSafeHwnd(); Fl{:aq"3  
 bi.pszDisplayName=name; g3[Zh=+]E  
 bi.lpszTitle="Select folder"; P2J{ Ml#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; U^jxKBq^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Cw`8[)=}o  
 if(idl==NULL) qFEGV+  
  return; ~P&Brn"=Rs  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); D5]4(]k&  
 str.ReleaseBuffer(); F\&Sn1>k  
 m_Path=str; .Cv0Ze  
 if(str.GetAt(str.GetLength()-1)!='\\') S;a'@5  
  m_Path+="\\"; %JmRJpCvR  
 UpdateData(FALSE); _ 4:@+{  
} QP/6N9/  
Wr3j8"f/  
void CCaptureDlg::SaveBmp() x:'M\c7  
{ ~3k& =3d]  
 CDC dc; ke.{wh\0  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); VrL==aTYXs  
 CBitmap bm; V=yRE  
 int Width=GetSystemMetrics(SM_CXSCREEN); gp07I{0~m  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2kg<O%KA`c  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0Y rdu,c  
 CDC tdc; RiHOX&-7  
 tdc.CreateCompatibleDC(&dc); 4dy2m!  
 CBitmap*pOld=tdc.SelectObject(&bm); a^yBtb~,P  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |Z%I3-z_DS  
 tdc.SelectObject(pOld); Xk#"rM< Y  
 BITMAP btm; @\-i3EhR  
 bm.GetBitmap(&btm); b=:$~N@Y  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; (!F Uu  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); f tBbO8e  
 BITMAPINFOHEADER bih; ]3.Un,F  
 bih.biBitCount=btm.bmBitsPixel; |$[WnYP  
 bih.biClrImportant=0; Q `$Q(/  
 bih.biClrUsed=0;  LW?Zd=  
 bih.biCompression=0; LxqK@Q<B  
 bih.biHeight=btm.bmHeight; qyXx`'e  
 bih.biPlanes=1; !'uLV#YEZ  
 bih.biSize=sizeof(BITMAPINFOHEADER); >r Nff!Ow  
 bih.biSizeImage=size; Y|ONCc  
 bih.biWidth=btm.bmWidth; diXb8L7B;  
 bih.biXPelsPerMeter=0; Wtl0qug  
 bih.biYPelsPerMeter=0; rBBA`Ut@F  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); cSdkhRAn  
 static int filecount=0; CPRv"T;?  
 CString name; ,:yv T6)p  
 name.Format("pict%04d.bmp",filecount++); =n $@  
 name=m_Path+name; uP,{yna(  
 BITMAPFILEHEADER bfh; s|3@\9\  
 bfh.bfReserved1=bfh.bfReserved2=0; ]8,:E ]`O  
 bfh.bfType=((WORD)('M'<< 8)|'B'); B35zmFX|}N  
 bfh.bfSize=54+size; 9G8n'jWyY  
 bfh.bfOffBits=54; cY/!z  
 CFile bf; jO'+r'2B9  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 3/ sKRU  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )h(Dt(2Wm  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }7k!>+eQ  
  bf.WriteHuge(lpData,size); F\m  
  bf.Close(); ^B9rt\,q  
  nCount++; -VK 6Fq  
 } - w41Bvz0  
 GlobalFreePtr(lpData); RG(m:N  
 if(nCount==1) s3m]rC  
  m_Number.Format("%d picture captured.",nCount); ?h`Ned0P  
 else ] iKFEd  
  m_Number.Format("%d pictures captured.",nCount); BKoc;20;  
  UpdateData(FALSE); 1FfdW>ay*  
} QusEWq)}<  
StUiL>9T#  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) k;V4%O  
{ @\gTi;u/x  
 if(pMsg -> message == WM_KEYDOWN) }qUNXE@  
 { XOl]s?6H$  
  if(pMsg -> wParam == VK_ESCAPE) ; n2|pC^  
   return TRUE; )k5lA=(Yr+  
  if(pMsg -> wParam == VK_RETURN) /a7tg+:  
   return TRUE; ,e"A9ik#  
 } .y7&!a35  
 return CDialog::PreTranslateMessage(pMsg); w, 0tY=h6  
} )"7hyW5  
KZ ezA4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) VdpkE0  
{ GD1=Fb"&)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ K GlO;Q~7  
  SaveBmp(); 6T6 S9A*nT  
  return FALSE; hjiU{@q  
} oOk.Fq  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ B`Q.<Lqu  
 CMenu pop; .8is! TT  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); O[RmQ8ll  
 CMenu*pMenu=pop.GetSubMenu(0); _]E ~ci}  
 pMenu->SetDefaultItem(ID_EXITICON); # k+Gg w  
 CPoint pt; VQHJ O I  
 GetCursorPos(&pt); Vv(!Ki}  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); s{q)m@  
 if(id==ID_EXITICON) { .KCK_ d  
  DeleteIcon(); *[*E|by  
 else if(id==ID_EXIT) p},6W,f  
  OnCancel(); iKB8V<[\T  
 return FALSE; +Q, 0kv  
} LV:oNK(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); IY|;}mIF  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) db"FC3/H  
 AddIcon(); (_ov _3  
 return res; 'e-Nt&;  
} mwFI89J'  
"Kk3#  
void CCaptureDlg::AddIcon() 8F0+\40  
{ ,hK0F3?H>  
 NOTIFYICONDATA data; lo:]r.lX{  
 data.cbSize=sizeof(NOTIFYICONDATA); Du>dTi~  
 CString tip; VVuL+i  
 tip.LoadString(IDS_ICONTIP); #bPio  
 data.hIcon=GetIcon(0); p$}iBk0B(z  
 data.hWnd=GetSafeHwnd(); -@ #b<"1  
 strcpy(data.szTip,tip); <[xxCW(2  
 data.uCallbackMessage=IDM_SHELL; GY4 :9Lub7  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; W|=?-  
 data.uID=98; 7Z>u|L($m  
 Shell_NotifyIcon(NIM_ADD,&data); GCrh4rxgg  
 ShowWindow(SW_HIDE); |0(Z)s,  
 bTray=TRUE; b:7;zOtF  
} i;^ e6A>  
LBtVK, ?  
void CCaptureDlg::DeleteIcon() daBu<0\  
{ Kzxzz6R?  
 NOTIFYICONDATA data; / /qTMxn  
 data.cbSize=sizeof(NOTIFYICONDATA); Vn1kC  
 data.hWnd=GetSafeHwnd(); ~Dr/+h:^\  
 data.uID=98; gcr,?rE<  
 Shell_NotifyIcon(NIM_DELETE,&data); zQ xZR}'  
 ShowWindow(SW_SHOW); AO;`k]0e  
 SetForegroundWindow(); ZZTPAmIr  
 ShowWindow(SW_SHOWNORMAL); _,b%t1v  
 bTray=FALSE; 7dX1.}M<(  
} %iIryv;  
_jef{j  
void CCaptureDlg::OnChange() yhEU *\:  
{ V_U$JKJ1=  
 RegisterHotkey(); q /|<>s  
} yY*OAC  
 D@qq=M  
BOOL CCaptureDlg::RegisterHotkey() ]M{SM`Ya  
{ }Evyfc#D  
 UpdateData(); fl~k')s  
 UCHAR mask=0; V~5vVY_HG&  
 UCHAR key=0; GZQ)Tz R  
 if(m_bControl) AEK* w4  
  mask|=4; [8Ub#<]]  
 if(m_bAlt) ;: Hfkyy]  
  mask|=2; {a_= 4a  
 if(m_bShift) D>c%5h  
  mask|=1; =(*Eh=Pw  
  key=Key_Table[m_Key.GetCurSel()]; ` e~/  
 if(bRegistered){ T~Jl{(s9)  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =b,$jCv<,5  
  bRegistered=FALSE; [?W3XUJ,Y  
 } L3nHvKA]  
 cMask=mask; Opmb   
 cKey=key; jL 8&  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);  AO;+XP=  
 return bRegistered; &X_I^*  
} ?TE#4}p|  
H1|X0 a(j  
  四、小结 *we3i  
=0,")aa!  
  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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