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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: t~":'le`zr  
  p ^9o*k`u  
  一、实现方法 h+j*vX/!  
& u6ydN1xe  
  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: ;s+3 #Py  
=>@ X+4Kb  
#pragma data_seg("shareddata") 8T Tj<T!N  
HHOOK hHook =NULL; //钩子句柄 e2L>"/  
UINT nHookCount =0; //挂接的程序数目 `$3ktQ$  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 gJ>#HEkMB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 59~mr:*sF  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;Nd'GA+1;(  
static int KeyCount =0; JkKbw&65  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 sj6LrE=1  
#pragma data_seg() Oc5f8uv  
U U#tm  
  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。 0IBQE  
UUF]45t>  
  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@{VQVx  
e7plL^^`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR pwV~[+SS_  
cKey,UCHAR cMask) D Q c pIV  
{ N1" bH~  
 BOOL bAdded=FALSE; /[n]t  
 for(int index=0;index<MAX_KEY;index++){ FU;a { irB  
  if(hCallWnd[index]==0){ "Jdi>{o8  
   hCallWnd[index]=hWnd; 8/;@4^Ux  
   HotKey[index]=cKey; hBhbcWD,ka  
   HotKeyMask[index]=cMask; TV`sqKW  
   bAdded=TRUE; G"".;}AV  
   KeyCount++; j3u!lZ}U  
   break; *w/N>:V0p  
  } N0N%~3  
 } Iz>\qC}  
 return bAdded; sn]D7Ae  
} QP>F *A  
//删除热键 8~g~XUl  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Rm~8n;7oOr  
{ ?8;WP&  
 BOOL bRemoved=FALSE; <;cch6Z  
 for(int index=0;index<MAX_KEY;index++){ ,$RXN8x1  
  if(hCallWnd[index]==hWnd){ qLl4t/p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ N2lz {  
    hCallWnd[index]=NULL; +fq\K]  
    HotKey[index]=0; f*T}Ov4  
    HotKeyMask[index]=0; PfGiJ]:V-u  
    bRemoved=TRUE; !sYZ1;WAO  
    KeyCount--; :z6?  
    break; 6o*'Q8h  
   } U /xzl4m6  
  } L@f&71  
 } ] v:"    
 return bRemoved; fA=Lb^,M  
} K cW 5  
Q5_,`r`  
15%6;K?b  
  DLL中的钩子函数如下: w{N8Y ~O  
Pon0(:#1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;alt%:$n  
{ ~RZN+N  
 BOOL bProcessed=FALSE; nP|ah~ q  
 if(HC_ACTION==nCode) JOs kf(  
 { {wO .nOB  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 rd"!&i  
   switch(wParam) jHObWUX  
   {  B[2t.d;h  
    case VK_MENU: N x^JC_  
     MaskBits&=~ALTBIT; E,ooD3$h  
     break; Mgu9m8 `J  
    case VK_CONTROL: ;ZkY[5  
     MaskBits&=~CTRLBIT; [jEA|rd~}  
     break; qLw^Qxo  
    case VK_SHIFT: -iFFXESVX  
     MaskBits&=~SHIFTBIT; *z_`$Y  
     break; =5:kV/p  
    default: //judge the key and send message 6j|~oMYP  
     break; b{X.lz0  
   } rA @|nL{  
   for(int index=0;index<MAX_KEY;index++){ jR*iA3LDo  
    if(hCallWnd[index]==NULL) }r"E\~E  
     continue; :`0,f?cE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UQWv)  
    { $#wi2Ve=6b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); O"_QDl<ya  
     bProcessed=TRUE; Lmw)Ts>  
    } A{\DzUV9,  
   } [g{fz3 O6  
  } >)mF'w  
  else if((lParam&0xc000ffff)==1){ //有键按下 KvI/!hl\  
   switch(wParam) "cbJ{ G1pk  
   { `iEYq0}  
    case VK_MENU: &v9"lR=_k  
     MaskBits|=ALTBIT; C;9P6^Oz  
     break; "j.Q*Hazg  
    case VK_CONTROL: j J54<.D  
     MaskBits|=CTRLBIT; )0Vj\>  
     break; c)q=il7ef  
    case VK_SHIFT: H)y_[:[  
     MaskBits|=SHIFTBIT; Z+4Mo*#  
     break; +?5Vuc%  
    default: //judge the key and send message T>&dPVmG,  
     break; w2^s}NO  
   } 6.a>7-K}%  
   for(int index=0;index<MAX_KEY;index++){ ^{NN-  
    if(hCallWnd[index]==NULL) 0XE(vc!  
     continue; /Wdrpv-%,1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,eL&Ner  
    { J|cw9u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Cn.dv-  
     bProcessed=TRUE; Upm#:i|"  
    } "g(q)u >  
   } $lJ!f  
  } b0tbS[j  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 YYvX@f  
   for(int index=0;index<MAX_KEY;index++){ CM `Q((  
    if(hCallWnd[index]==NULL) +.$:ZzH#  
     continue; 2Ns<lh   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $0]5b{i]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9N|JI3*41  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 9yLPh/!Ob  
   } s,D GFK  
  } H/*i-%]v+(  
 } =Hj3o_g-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -ilhC Y@M  
} vJW`aN1<I3  
7mb5z/N  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: m 7+=w>o  
<&4~Z! O  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3[~LmA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _sHeB7K  
dp3TJZ+U  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: n9 Jev_!A  
6O@Lx ]t  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l 5f'R  
{ U1kW1L}B  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) nYj7r* e[  
 { q"-Vh,8h  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ~fO#En  
  SaveBmp(); d 5h x%M  
  return FALSE; ~{6}SXp4U  
 } XU}" h&>  
 …… //其它处理及默认处理 T8j<\0WW  
} V7+/|P_  
^q<EnsY  
}5X.*wz  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 >PGsY[N  
YT@H^=  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 rPHM_fW(O@  
-3XnUGK  
  二、编程步骤 V0gu0+u~R  
W5&KmA  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; (c[DQSj  
<F| S<\Y.  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; _G)x\K]N  
?1X7jn`,+  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Wx8;+!2Q/  
BJsN~` =r  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; t4-0mNBZt$  
fY|vq amA;  
  5、 添加代码,编译运行程序。 ~\c  j  
X,K`]hb*0_  
三、程序代码 pf3-  
 ww\2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL c>C!vAg  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) O@rZ ^Aa  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \<b42\a}  
#if _MSC_VER > 1000 dBW4%Zh  
#pragma once 4_4|2L3  
#endif // _MSC_VER > 1000 G2J4N2hu  
#ifndef __AFXWIN_H__ FWS!b!#,N  
#error include 'stdafx.h' before including this file for PCH Ej`G(  
#endif RLDu5  
#include "resource.h" // main symbols t1aKq)?  
class CHookApp : public CWinApp ay=f1<a  
{ #;'*W$Wk2  
 public: h:vI:V[/X  
  CHookApp(); y!\q ', F  
  // Overrides qmnW  
  // ClassWizard generated virtual function overrides , w_C~XN$t  
  //{{AFX_VIRTUAL(CHookApp) g;y*F;0@  
 public: 5WtI.7r  
  virtual BOOL InitInstance(); &hzr(v~;  
  virtual int ExitInstance(); 1_LGlu~&  
  //}}AFX_VIRTUAL C,{ Ekbg  
  //{{AFX_MSG(CHookApp) )/{~&L U  
  // NOTE - the ClassWizard will add and remove member functions here. A{52T]9X  
  // DO NOT EDIT what you see in these blocks of generated code ! 9O:-q[K**  
  //}}AFX_MSG @ t8{pb;v  
  DECLARE_MESSAGE_MAP() o^BX:\}  
}; Vb~;"WABo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); l +O\oD?-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Aac7k m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ` h1>rP  
BOOL InitHotkey(); NbUibxJ  
BOOL UnInit(); eZ(o_  
#endif {.UK{nA?sm  
;S+"z;$m  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. FFf ~Vmw  
#include "stdafx.h" d,t'e?  
#include "hook.h" S,C/l1s  
#include <windowsx.h> OEHw%  
#ifdef _DEBUG kgRgHkAH~  
#define new DEBUG_NEW B5va4@  
#undef THIS_FILE e?dR'*-z  
static char THIS_FILE[] = __FILE__; 6Kd,(DI  
#endif "o<&3c4  
#define MAX_KEY 100 &s&Ha{(!w  
#define CTRLBIT 0x04 SS-7y:6y>  
#define ALTBIT 0x02 iP?=5j=4  
#define SHIFTBIT 0x01 p2 m`pT  
#pragma data_seg("shareddata") Wt! NLlN8  
HHOOK hHook =NULL; E%)3{# .z  
UINT nHookCount =0; vLM-v  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey diF2:80o  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 5%R$7>`Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey *&W1|Qkg_  
static int KeyCount =0; BctU`.  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift y Xi$w.gr  
#pragma data_seg() 6;}FZ  
HINSTANCE hins; U6_GEBz~y  
void VerifyWindow(); kn6X I*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) <t.  w(?  
//{{AFX_MSG_MAP(CHookApp) RSf*[2  
// NOTE - the ClassWizard will add and remove mapping macros here. l' a<k"  
// DO NOT EDIT what you see in these blocks of generated code! n UD;y}}n  
//}}AFX_MSG_MAP w;T?m,"  
END_MESSAGE_MAP() ~ponYc.Y  
.BZ3>]F3<  
CHookApp::CHookApp() Uj~ :| ?Wz  
{ qg8T}y>  
 // TODO: add construction code here, {+|Em(M  
 // Place all significant initialization in InitInstance `~ R%}ID  
} M{U7yE6*j*  
M Y>o8A  
CHookApp theApp; u-~?ylh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) J<7nOB}OD  
{  xXZ {  
 BOOL bProcessed=FALSE;  /w(t=Y  
 if(HC_ACTION==nCode) B_|jDH#RyJ  
 { x^6sjfAW  
  if((lParam&0xc0000000)==0xc0000000){// Key up \jByJCN  
   switch(wParam) dn= g!=  
   { 62J -)~_  
    case VK_MENU: iYzm<3n?  
     MaskBits&=~ALTBIT; ^2!l/(?  
     break; l":Z. J  
    case VK_CONTROL: ;S^7Q5-  
     MaskBits&=~CTRLBIT; pkEqd"G  
     break; OYNPZRu  
    case VK_SHIFT: /9 soUt  
     MaskBits&=~SHIFTBIT; _cXLQ)-  
     break; w]Vd IS  
    default: //judge the key and send message z T#j.v  
     break; ngQ]  
   } !4!Y~7sI"\  
   for(int index=0;index<MAX_KEY;index++){ \Y}nehxG@  
    if(hCallWnd[index]==NULL) NxQ+z^o\  
     continue; o_ SR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u6u1>  
    { h8tKYm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wr;8o*~  
     bProcessed=TRUE; F /% 5 r{  
    } twJ)h :!_y  
   } ?hwT{h  
  } '-m )fWf  
  else if((lParam&0xc000ffff)==1){ //Key down 6/eh~ME=  
   switch(wParam) F;_L/8Ov1  
   { ?W4IAbT\G  
    case VK_MENU: [#6Eax,j  
     MaskBits|=ALTBIT; Ym "Nj  
     break; X'h J&-[P  
    case VK_CONTROL: w>$2  
     MaskBits|=CTRLBIT; xQ7-4 N,  
     break; sDvtk]4o-4  
    case VK_SHIFT: 4V0j1 k&'  
     MaskBits|=SHIFTBIT; HX:rVHY  
     break; }[*BC5{>  
    default: //judge the key and send message o  w<.Dh  
     break; ] 6rr;S  
   } y9L:2f\  
   for(int index=0;index<MAX_KEY;index++) Wo+'j $k  
   { 5//.q;z  
    if(hCallWnd[index]==NULL) SB' $?Kh  
     continue; +gQoYlso  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mOvwdRKn  
    { +c^[[ K"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C@i4[g){  
     bProcessed=TRUE; #x;i R8^  
    } 3mnq=.<(w  
   } ?1u2P$d  
  } ]MXeWS(  
  if(!bProcessed){ Z6I^HG{:  
   for(int index=0;index<MAX_KEY;index++){ bl;C=n  
    if(hCallWnd[index]==NULL) ngoAFb  
     continue; o {bwWk7v6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q(Dp116  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); L0H kmaH  
   } Jr4^@]78o<  
  } p%v+\T2r  
 } Rv T>{G~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C!8XFf8e  
} 5ZkMd !$y  
LMmW3W`   
BOOL InitHotkey() =c,m)\u/8  
{ |tU4(hC  
 if(hHook!=NULL){ JtrLTo  
  nHookCount++; ,U#$Qb 12  
  return TRUE; w1+xlM,,9  
 } lJloa'%v9  
 else iCYo?>  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ^Pk-<b4}  
  if(hHook!=NULL) oX9rpTi  
   nHookCount++; <ZV !fn  
  return (hHook!=NULL); :3# t;  
} ;-1yG@KG  
BOOL UnInit() ,nELWzz%{  
{ nRmZu\(Ow|  
 if(nHookCount>1){ Dog Tj  
  nHookCount--; 6R+m;'  
  return TRUE; $(ugnnJ*  
 } Jn_;  cN  
 BOOL unhooked = UnhookWindowsHookEx(hHook); *hp3w  
 if(unhooked==TRUE){ \*0ow`|K  
  nHookCount=0; PKhH0O\_U  
  hHook=NULL; jz_\B(m9%  
 } mG!Rh  
 return unhooked; (bk~,n_  
} TrHz(no  
H *gF>1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G#&R/Tc5N  
{ G:e 9}  
 BOOL bAdded=FALSE; %hzl3>().  
 for(int index=0;index<MAX_KEY;index++){ x7=5 ;gf/X  
  if(hCallWnd[index]==0){ rQ^$)%uP  
   hCallWnd[index]=hWnd; p}j$p'D.RI  
   HotKey[index]=cKey; g pN{1  
   HotKeyMask[index]=cMask; 0# D4;v  
   bAdded=TRUE; "+2Hde1  
   KeyCount++; u[_~ !y  
   break; 4|*H0}HOm  
  } MH+t`/E0]  
 } '{:WxGgi  
 return bAdded; :6 ?&L  
} u~,@Zg87  
5__8+R  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $~<);dYu0  
{ at@B>Rb  
 BOOL bRemoved=FALSE; > !thxG/_  
 for(int index=0;index<MAX_KEY;index++){ T=|oZ  
  if(hCallWnd[index]==hWnd){ 'G!w0yF  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ h5-<2B|  
    hCallWnd[index]=NULL; G9.+N~GZ.  
    HotKey[index]=0; D_%y&p?<Ls  
    HotKeyMask[index]=0; %.kJ@@_e  
    bRemoved=TRUE; k{3:$, b  
    KeyCount--; QQ4  &,d  
    break; ]e?cKC\"e  
   } MX-(;H  
  } LY%`O#i.  
 } C ebl"3Q  
 return bRemoved; M~Yho".  
} o:<g Jzg  
,[rh7 _  
void VerifyWindow() t'bzhPQO)f  
{ H1H+TTZr  
 for(int i=0;i<MAX_KEY;i++){ * _puW x  
  if(hCallWnd!=NULL){ 72qbxPY13h  
   if(!IsWindow(hCallWnd)){ f>Mg.9gJ(  
    hCallWnd=NULL; 51Yq>'8  
    HotKey=0; 0^VA,QkQ\  
    HotKeyMask=0; 5+<<:5_6l  
    KeyCount--; ssv4#8p3  
   } 8'Eu6H&$G  
  } ZW$PJmz  
 } rAK}rNxI  
} 5Uc!;Gd?b  
rULrGoM  
BOOL CHookApp::InitInstance() kDM\IyM<\  
{ ULq#2l  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); d>z?JD t  
 hins=AfxGetInstanceHandle(); =6Dz<Lq  
 InitHotkey(); \Lxsg! wtJ  
 return CWinApp::InitInstance(); Y]ML-smN  
} .` z](s  
&[*F!=%8  
int CHookApp::ExitInstance() tkBp?Wl  
{ |kL^k{=zV  
 VerifyWindow(); sGjYL>*  
 UnInit(); +@wa?"  
 return CWinApp::ExitInstance(); H@$\SUc{  
} a)'^'jm)4  
I4kN4*d!N,  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file tH0=ysf  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (^-i[aJY  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ lPL>8.j  
#if _MSC_VER > 1000 ?Xscc mN  
#pragma once #!d@;= [\  
#endif // _MSC_VER > 1000 #M;Cw}pW  
0GW(?7ZC  
class CCaptureDlg : public CDialog @GzEhv  
{ %/17K2g  
 // Construction Yb8o`j+t  
 public: Fv \yhR  
  BOOL bTray; w) o^?9T  
  BOOL bRegistered; d(RSn|[0  
  BOOL RegisterHotkey(); irSdqa/  
  UCHAR cKey; 7@R;lOzL3  
  UCHAR cMask; !BD+H/A.{  
  void DeleteIcon(); sfSM7f  
  void AddIcon(); tSK{Abw1B  
  UINT nCount; .!T]sX_P  
  void SaveBmp(); R9X* R3nB  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ,&S:(b[D  
  // Dialog Data &D, gKT~  
  //{{AFX_DATA(CCaptureDlg) (,~gY=E+  
  enum { IDD = IDD_CAPTURE_DIALOG }; LFHV~>d  
  CComboBox m_Key; ek~bXy{O`  
  BOOL m_bControl; lYkm1  
  BOOL m_bAlt; ;W6P$@'zs  
  BOOL m_bShift; ?[>+'6  
  CString m_Path; wykk</eQ.i  
  CString m_Number; -=aI!7*"$  
  //}}AFX_DATA *k:Sg*neVq  
  // ClassWizard generated virtual function overrides RX.n7Tb  
  //{{AFX_VIRTUAL(CCaptureDlg) Xk[;MZ[  
 public: 1<RB}M  
  virtual BOOL PreTranslateMessage(MSG* pMsg); n5i#GvO^  
 protected: MsMNP[-l  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :Hdn&a i  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2x-67_BHY=  
  //}}AFX_VIRTUAL Wu]D pe  
  // Implementation b&s"/Y89  
 protected: bV_@!KL$  
  HICON m_hIcon; Sns`/4S?6Z  
  // Generated message map functions W)^0~[`i  
  //{{AFX_MSG(CCaptureDlg) Gj]*_"T  
  virtual BOOL OnInitDialog(); z-*/jFE  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); y=)Cid  
  afx_msg void OnPaint(); B`,4M&  
  afx_msg HCURSOR OnQueryDragIcon(); Rckqr7q  
  virtual void OnCancel(); PzThVeJ+  
  afx_msg void OnAbout(); )h-Qi#{  
  afx_msg void OnBrowse(); N:Yjz^Jt  
  afx_msg void OnChange(); {e4`D1B  
 //}}AFX_MSG :4]^PB@dl  
 DECLARE_MESSAGE_MAP() 8 ;oU{  
}; zmk#gk2H  
#endif 0q`n]NM  
.du FMJl  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 5}FPqyK"  
#include "stdafx.h" 9mW95YI S  
#include "Capture.h" .JIn(  
#include "CaptureDlg.h" X PnN"Y"y  
#include <windowsx.h> ,B ]kX/W  
#pragma comment(lib,"hook.lib") y'ULhDgq^B  
#ifdef _DEBUG O(BAw  
#define new DEBUG_NEW  u!TVvc  
#undef THIS_FILE L=W8Q8hf  
static char THIS_FILE[] = __FILE__; [5$=G@ zf  
#endif Jsf -t  
#define IDM_SHELL WM_USER+1 2aiZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yD6lzuk{X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S<"T:Y &  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _h1n]@ d5  
class CAboutDlg : public CDialog $y~!ePKh  
{ i,jPULzyjk  
 public: B\BxF6 y  
  CAboutDlg(); ^W-03  
  // Dialog Data ,Q~C F;qe  
  //{{AFX_DATA(CAboutDlg) dZ'hTzw~  
  enum { IDD = IDD_ABOUTBOX }; _&s37A&\  
  //}}AFX_DATA O 4xV "\  
  // ClassWizard generated virtual function overrides 3#7D g't  
  //{{AFX_VIRTUAL(CAboutDlg) w@U`@})r.  
 protected: cl s-x@ Kd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support FFGG6r  
  //}}AFX_VIRTUAL G%N3h'zDi  
  // Implementation VHhW_ya1g{  
 protected: H6Q1r[(B  
  //{{AFX_MSG(CAboutDlg) %,Fx qw  
  //}}AFX_MSG ][R#Q;y<  
  DECLARE_MESSAGE_MAP() NQCJ '%L6  
}; {bB;TO<b`  
lTOO`g  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) S7SD$+fX  
{ $agd9z,&m  
 //{{AFX_DATA_INIT(CAboutDlg) noz&4"S.{  
 //}}AFX_DATA_INIT Bd8,~8  
} oW]~\vp^0  
^3*k6h [(  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,1+AfI  
{ :Z0m "  
 CDialog::DoDataExchange(pDX); :G?6Hl)~)  
 //{{AFX_DATA_MAP(CAboutDlg) m}Z=m8  
 //}}AFX_DATA_MAP >P*wK9|(  
} JA'C\  
NbyVBl0=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) cY1d6P0  
 //{{AFX_MSG_MAP(CAboutDlg) f{=0-%dA  
 // No message handlers >*v!2=  
 //}}AFX_MSG_MAP  p]z *  
END_MESSAGE_MAP() XBi}hT  
Gb]t%\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) nRKh|B)  
: CDialog(CCaptureDlg::IDD, pParent) 4?GW]'d  
{ W| S{v7[l  
 //{{AFX_DATA_INIT(CCaptureDlg) Cf#[E~24  
  m_bControl = FALSE; (dl7+  
  m_bAlt = FALSE; k!Y7 Rc{"  
  m_bShift = FALSE; D,Ft*(|T  
  m_Path = _T("c:\\"); 5x";}Vp>P  
  m_Number = _T("0 picture captured."); 0. _)X  
  nCount=0; Z>GqLq\`ed  
  bRegistered=FALSE; ~4YU  
  bTray=FALSE;  f,utA3[  
 //}}AFX_DATA_INIT vMOI&_[\z  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 U2  0@B`<  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); I@x^`^+l  
} l_ /q/8-l  
go^?F- dZ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) IyvJwrO  
{ f=%k9Y*)  
 CDialog::DoDataExchange(pDX); We]mm3M3  
 //{{AFX_DATA_MAP(CCaptureDlg) NijvFT$V1  
  DDX_Control(pDX, IDC_KEY, m_Key); ~Dsz9  f  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); A1`y_ Aj  
  DDX_Check(pDX, IDC_ALT, m_bAlt); =<nx [J  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 7VWq8FH`  
  DDX_Text(pDX, IDC_PATH, m_Path); 4 \*!]5i  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Kts#e:k@  
 //}}AFX_DATA_MAP |7G +O+j  
} +AVYypql8K  
A1{ 7g<k6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) a`XXz  
//{{AFX_MSG_MAP(CCaptureDlg) ^ ,`;x  
 ON_WM_SYSCOMMAND() tz{W69k+  
 ON_WM_PAINT() FM\yf ]'  
 ON_WM_QUERYDRAGICON() Qs(WyP#  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Un{hI`3]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 5.st!Lp1  
 ON_BN_CLICKED(ID_CHANGE, OnChange) (<RZZ{m  
//}}AFX_MSG_MAP 7}+U;0,)  
END_MESSAGE_MAP() xE+Nz5F  
1t"  
BOOL CCaptureDlg::OnInitDialog() UOTM>d1P  
{ d^5OB8t  
 CDialog::OnInitDialog(); kaBP& 6|Z  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (+Ia:D  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7aAT  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *uJcB|KX  
 if (pSysMenu != NULL) zNe>fZ  
 { 6wk/IJ`  
  CString strAboutMenu; pF~[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); [UqJ3@>  
  if (!strAboutMenu.IsEmpty()) L`v7|!X  
  { *aKT&5Ch-  
   pSysMenu->AppendMenu(MF_SEPARATOR); g]B! 29M  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0<3)K[m~H  
  } ~y@,d  
 } yQ5F'.m9e  
 SetIcon(m_hIcon, TRUE); // Set big icon `Mj>t(  
 SetIcon(m_hIcon, FALSE); // Set small icon Y](kMNUSg  
 m_Key.SetCurSel(0); B J,U,!  
 RegisterHotkey(); 2%0J/]n\A"  
 CMenu* pMenu=GetSystemMenu(FALSE); PGTi-o}  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); nt$V H  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m0I/X$-Cl5  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \4;}S&`k  
 return TRUE; // return TRUE unless you set the focus to a control G$b*N4yR  
} l ;TWs_N  
MXy~kb&  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) GjDs,9@f  
{ sC ,[CN:b  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) pwq a/Yi  
 { &PJ&XTR  
  CAboutDlg dlgAbout; Hggp*(AQK  
  dlgAbout.DoModal(); yht|0mZV  
 } KMFvi_8  
 else RzPqtN  
 { ";:"p6?  
  CDialog::OnSysCommand(nID, lParam); u=epnz:<  
 } fQZ,kl  
} yk1.fxik'  
AcF6p)@_  
void CCaptureDlg::OnPaint() P+tnXT>nE  
{ zoFCHs r  
 if (IsIconic()) ,{{e'S9cy  
 { :u}FF"j  
  CPaintDC dc(this); // device context for painting qo2/?]  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /%W&zd=%#  
  // Center icon in client rectangle U-uBz4Gha  
  int cxIcon = GetSystemMetrics(SM_CXICON); %`rZ]^H  
  int cyIcon = GetSystemMetrics(SM_CYICON); N_#QS}H  
  CRect rect; OMaG*fb=  
  GetClientRect(&rect); x'Uv;mGo  
  int x = (rect.Width() - cxIcon + 1) / 2; Yxe%:  
  int y = (rect.Height() - cyIcon + 1) / 2; %bs6Uy5g)a  
  // Draw the icon pDW4DF:`(  
  dc.DrawIcon(x, y, m_hIcon); z)z_]c-X+  
 } .2y2Qm  
 else & ,KxE(C  
 { njO5 YYOu  
  CDialog::OnPaint(); TF_~)f(`  
 } $+#Lq.3,  
} ) `u)#@x  
u 3&9R)J1  
HCURSOR CCaptureDlg::OnQueryDragIcon() XJ\ j0  
{ xj/Iq<'R*O  
 return (HCURSOR) m_hIcon; B]):$#{Rxl  
} zqd_^  
h/T^+U?-<  
void CCaptureDlg::OnCancel() 2(5HPRQ  
{ #dcfQ  
 if(bTray) /uXEh61$8  
  DeleteIcon(); Kwc~\k  
  CDialog::OnCancel(); Tyc`U&  
} V\C$/8v  
Y!M&8;>  
void CCaptureDlg::OnAbout() (<|NerwD  
{ |$Y0VC4a  
 CAboutDlg dlg; _*(n2'2B  
 dlg.DoModal(); :?LUv:G  
} _FG?zE  
<F~0D0G  
void CCaptureDlg::OnBrowse() ^ +e5 M1U=  
{ 9eA2v{!S  
 CString str; -kFPmM;  
 BROWSEINFO bi; !nPwRK>  
 char name[MAX_PATH]; W<W5ih,#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #x) lN  
 bi.hwndOwner=GetSafeHwnd(); =#tQhg,_  
 bi.pszDisplayName=name; w 0V=49  
 bi.lpszTitle="Select folder"; |}G"^r  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; !PA:#]J  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); vvxxwZa=O  
 if(idl==NULL) rRe5Q  
  return; c-$rB_t+  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \}b2 oiY  
 str.ReleaseBuffer(); y[ dB mTY  
 m_Path=str; Orq/38:4G  
 if(str.GetAt(str.GetLength()-1)!='\\') u n v:sV#b  
  m_Path+="\\"; ^)dsi  
 UpdateData(FALSE); CPJ<A,V  
} px;~20$e  
1-gM)x{Jr  
void CCaptureDlg::SaveBmp() tyR?A>F4  
{ ,j%\3g`  
 CDC dc; QEJu.o  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); UPfE\KN+p#  
 CBitmap bm; (ks>F=vk*  
 int Width=GetSystemMetrics(SM_CXSCREEN); [edF'7La  
 int Height=GetSystemMetrics(SM_CYSCREEN); -gs I:-Xo  
 bm.CreateCompatibleBitmap(&dc,Width,Height); o-8{C0>:  
 CDC tdc; |nQfgl=V  
 tdc.CreateCompatibleDC(&dc); ~-'2jb*8  
 CBitmap*pOld=tdc.SelectObject(&bm); ']nIa7  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); NN4Z:6W5  
 tdc.SelectObject(pOld); P#A,(Bke3  
 BITMAP btm; !4p{ b f  
 bm.GetBitmap(&btm); Kki(A 4;7F  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; JT 7WZc)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); hCQOwk#  
 BITMAPINFOHEADER bih; Km5_P##  
 bih.biBitCount=btm.bmBitsPixel; Gld~GyB\k  
 bih.biClrImportant=0; @)b'3~ D  
 bih.biClrUsed=0; g}+|0FTV  
 bih.biCompression=0; Mk*4J]PP  
 bih.biHeight=btm.bmHeight; )la3GT*1mS  
 bih.biPlanes=1; RE t&QP  
 bih.biSize=sizeof(BITMAPINFOHEADER); Z|qI[uiO  
 bih.biSizeImage=size; V>Jr4z  
 bih.biWidth=btm.bmWidth; li*S^uSF  
 bih.biXPelsPerMeter=0; ?T/4 =  
 bih.biYPelsPerMeter=0; =Z+^n ?"  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2O kID WcM  
 static int filecount=0; !~E/Rp  
 CString name; 2c Xae  
 name.Format("pict%04d.bmp",filecount++); eCI'<^  
 name=m_Path+name; P`Zon  
 BITMAPFILEHEADER bfh; XIIq0I  
 bfh.bfReserved1=bfh.bfReserved2=0; Vg$d|m${  
 bfh.bfType=((WORD)('M'<< 8)|'B'); E]#;K-j  
 bfh.bfSize=54+size; oRbWqN`F.  
 bfh.bfOffBits=54; g]f<k2  
 CFile bf; 29:2Xu i  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ phDIUhL$z  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DGJ:#U E  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); wiI@DJ>E  
  bf.WriteHuge(lpData,size); ^y>V-R/N  
  bf.Close(); g=td*S  
  nCount++; M{L<aYe  
 } 0L>3 i8'  
 GlobalFreePtr(lpData); D*.3]3-I  
 if(nCount==1) va@;V+cD  
  m_Number.Format("%d picture captured.",nCount); ;W{z"L;nX  
 else 5j`sJvq  
  m_Number.Format("%d pictures captured.",nCount); 8$-MUF,  
  UpdateData(FALSE); 6Jgl"Jw8  
} j"jssbu}  
s~,!E  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) s $(%]~P  
{ S\Z*7j3;M  
 if(pMsg -> message == WM_KEYDOWN) S[L@8z.Sj  
 { 4<s;xSCL  
  if(pMsg -> wParam == VK_ESCAPE) i7dDklj4  
   return TRUE; ,.Ofv):=  
  if(pMsg -> wParam == VK_RETURN) E]q>ggeNH  
   return TRUE; `6rLd>=R  
 } 0/~p1SSun  
 return CDialog::PreTranslateMessage(pMsg); OG#^d5(  
} lZwjrU| _  
C 9%bD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7Ydqg&  
{ N)(m^M(~0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ p7+{xXf  
  SaveBmp(); 1 k!gR  
  return FALSE; "pt[Nm76)8  
} hEjvtfM9\-  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "0!#De  
 CMenu pop; 6ud?US(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); D?ic~-&  
 CMenu*pMenu=pop.GetSubMenu(0); 3~`\FuHHe  
 pMenu->SetDefaultItem(ID_EXITICON); 3+>R%TX6i<  
 CPoint pt; dtuCA"D  
 GetCursorPos(&pt); A]"6/Lr9P  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ,GWa3.&.d  
 if(id==ID_EXITICON) v_5O*F7)  
  DeleteIcon(); )-+tN>Bb  
 else if(id==ID_EXIT)  '0f!o&?g  
  OnCancel(); J|xXo  
 return FALSE; 7_Vd%<:  
} @i68%6H`?  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Yq Fzbm{\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +|H'I j$  
 AddIcon(); !K 9(OX2;  
 return res; EK#m?O:>  
} C\; 8l}t  
^0&] .m  
void CCaptureDlg::AddIcon() C49 G&  
{ h|H;ZC(B  
 NOTIFYICONDATA data; GMNb;D(>K  
 data.cbSize=sizeof(NOTIFYICONDATA); E\zhxiI  
 CString tip; L[bGO|O  
 tip.LoadString(IDS_ICONTIP); L)+ eM&W  
 data.hIcon=GetIcon(0); U .Od  
 data.hWnd=GetSafeHwnd(); bGJUu#  
 strcpy(data.szTip,tip); OL'=a|g|c  
 data.uCallbackMessage=IDM_SHELL; L%0lX$2&\  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; OKqpc;y:D  
 data.uID=98; ks5'Z8X  
 Shell_NotifyIcon(NIM_ADD,&data); O9_YVE/-]  
 ShowWindow(SW_HIDE); )QE_+H}p  
 bTray=TRUE; ^pjez+  
} 2o$8CR;  
(lnQ!4LK  
void CCaptureDlg::DeleteIcon() UBVb#FNF  
{ C|I 1 m  
 NOTIFYICONDATA data; AWDjj\Q4  
 data.cbSize=sizeof(NOTIFYICONDATA); >gZz`CH  
 data.hWnd=GetSafeHwnd(); X]fw9tZ  
 data.uID=98; V~_nyjrJM  
 Shell_NotifyIcon(NIM_DELETE,&data); PsgzDhRv  
 ShowWindow(SW_SHOW); K;qZc\q  
 SetForegroundWindow(); PWMaB  
 ShowWindow(SW_SHOWNORMAL); zEB1Br,  
 bTray=FALSE; (*RybKoaA  
} l(5-Cr  
t0>{0 5  
void CCaptureDlg::OnChange() yd72y'zi  
{ [86'/:L\2  
 RegisterHotkey(); ;SW-dfo2i  
} pt R  
;Kf|a}m-  
BOOL CCaptureDlg::RegisterHotkey() %RN-J*s]  
{ _}&]`,s>  
 UpdateData(); C6VoOT )\  
 UCHAR mask=0; *r`Yz}  
 UCHAR key=0; 9^='&U9sr  
 if(m_bControl) MuobMD}jqe  
  mask|=4; R`Lm"5w  
 if(m_bAlt) pPZ/O 6  
  mask|=2; dM UDLr-  
 if(m_bShift) `X='g96C1  
  mask|=1; tD]&et  
  key=Key_Table[m_Key.GetCurSel()]; $vBU}~l7  
 if(bRegistered){ (L >[,YO9  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); UTQKlwPa  
  bRegistered=FALSE; HD{`w1vcN  
 } ,}tdfkZFYl  
 cMask=mask; o"FiM5L^.  
 cKey=key; Xa@wN/"F  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (UF!Zb]{  
 return bRegistered; Gme$FWa  
} DANSexW  
GC[{=]}9U  
  四、小结 (U_Q7hja?  
bUN,P"  
  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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