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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: (;}tf~~r  
  F6W}mMZH/N  
  一、实现方法 Pd~MiyO;K  
2J<&rKCF  
  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: .Pw%DZ'  
yG&2UqX  
#pragma data_seg("shareddata") S$e Dnw~$  
HHOOK hHook =NULL; //钩子句柄 u g\w\b  
UINT nHookCount =0; //挂接的程序数目 Qw?+!-7TN  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 w(B H247`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 A62<]R)n  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey gDCOLDM  
static int KeyCount =0; "}b'E#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 .+E#q&=  
#pragma data_seg() .#fPw_i  
:[sOKV i  
  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。 =XT)J6z^"  
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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: We}lx{E  
knT.l"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR m&IsDAn  
cKey,UCHAR cMask) ]` ]g@v  
{ =Ikg.jYq&F  
 BOOL bAdded=FALSE; frN3S  
 for(int index=0;index<MAX_KEY;index++){ Km3&N  
  if(hCallWnd[index]==0){ s /%:dnij  
   hCallWnd[index]=hWnd; iePf ]O*  
   HotKey[index]=cKey; Bf]$X>d  
   HotKeyMask[index]=cMask; 8~ #M{}  
   bAdded=TRUE; Pl+xH%U+?  
   KeyCount++; j'G tgT  
   break; 8$vK5Dnn8  
  } 5]"SGP  
 } M)!skU   
 return bAdded; !QEL"iJ6M'  
} ^bUxLa[.  
//删除热键 B9X8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }nud  
{ NQ9Ojj{#  
 BOOL bRemoved=FALSE; GK{{7B  
 for(int index=0;index<MAX_KEY;index++){ RY=1H  
  if(hCallWnd[index]==hWnd){ b2 kWjg.4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ z^W$%G  
    hCallWnd[index]=NULL; l#bAl/c`  
    HotKey[index]=0; 6)e5zKW!?  
    HotKeyMask[index]=0; ?znSx}t  
    bRemoved=TRUE; C+%K6/J(  
    KeyCount--; ^0tw%6:  
    break; @Bs0Avj.  
   } mm[SBiFO\  
  } otr>3a*'  
 } 7=P^_LcU  
 return bRemoved; t`|,6qEG  
} cDV ^8 R  
$h28(K%  
(j&A",^^S  
  DLL中的钩子函数如下: Veji^-0E  
rt4Z;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Zb''mf\  
{ ]gEhE  
 BOOL bProcessed=FALSE; Owf.f;QR  
 if(HC_ACTION==nCode) )1F<6R  
 { naNyGE7)  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 TJy4<rb  
   switch(wParam) >dQK.CG  
   {  8#LJ*o  
    case VK_MENU: SH8/0g?  
     MaskBits&=~ALTBIT; x#8w6@iPQ  
     break; J]pa4C`  
    case VK_CONTROL: lKV"Mh+6  
     MaskBits&=~CTRLBIT; onte&Ed\  
     break; )`HA::  
    case VK_SHIFT: 1u}nm;3  
     MaskBits&=~SHIFTBIT; ^_>!B)  
     break; Q\kub_I{@  
    default: //judge the key and send message Sm|(  
     break; V#83!  
   } !.Zt[g}  
   for(int index=0;index<MAX_KEY;index++){ 3HiFISA*  
    if(hCallWnd[index]==NULL) .mxTfP=9  
     continue; 2t1I3yA'{z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) NZXjE$<Vr  
    { cH D%{xlb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "uD= KlA  
     bProcessed=TRUE; w1|Hy2D`0  
    } |M5-5)  
   } 68t}w^=  
  } j+^L~, S  
  else if((lParam&0xc000ffff)==1){ //有键按下 )\ 0F7Z  
   switch(wParam) H{fM%*w  
   { 6)*xU|fU  
    case VK_MENU: 8_we: 9A  
     MaskBits|=ALTBIT; (P@Y36j>N  
     break; or?%-)  
    case VK_CONTROL: 85]SC$  
     MaskBits|=CTRLBIT; :tGYs8UK  
     break; g]$ 4~"|.  
    case VK_SHIFT: < {ru|-9  
     MaskBits|=SHIFTBIT; >+9JD%]x]  
     break; d"T Ht}  
    default: //judge the key and send message ;")A{tX2  
     break; J7&DR^.Sw  
   } 5EeDHsvV9  
   for(int index=0;index<MAX_KEY;index++){ yA7 )Y})>  
    if(hCallWnd[index]==NULL) ~&VN_;j_  
     continue; v}uJtBG(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &__DJ''+  
    { IazkdJX~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Vk}49O<K/  
     bProcessed=TRUE; BzbDZV  
    } ,M6ZZ* ,e  
   } KCR N}`^  
  } K|^wc$  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 xtfRrX^  
   for(int index=0;index<MAX_KEY;index++){ sbsu(Sz+  
    if(hCallWnd[index]==NULL) H;KDZO9W  
     continue; @Hjea1@t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) B~gV'(9g  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); yTAvF\s$(  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 VOgi7\  
   } OtUr GQP  
  } %|"Qi]c d  
 } "Pc$\zJm;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [ygF0-3ND  
} LAs7>hM  
&Cro2|KZhG  
  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: 6rDfQ`f\p  
6Wf^0ok  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t#b0H)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); HFtf  
UTk r.T+2X  
  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: UuJjO^t  
jNl/!l7B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) a/:XXy |  
{ ;e s^R?z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) J !#Zi#8sF  
 {  '3 ,\@4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Ex(3D[WmMW  
  SaveBmp(); \cySWP[  
  return FALSE; e>H:/24  
 } r|R7- HI  
 …… //其它处理及默认处理 :#X[%"g.  
} 8L{u}|{  
)iLM]m   
s: |M].  
  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。 y!Cc?$]_Y  
bI ITPxz  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 UH3t(o7O  
SN">gmY+  
  二、编程步骤 vA&Vu"}S  
9y]J/1#  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; =,/D/v$m'2  
xAdq+$><  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; d>i13d AI  
mN}7H:,  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 6`e@$(dfA  
Jh@_9/?  
  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; g1[&c+=U`P  
5vOCCW  
  5、 添加代码,编译运行程序。 T0e<Slo~C  
jPJAWXB4a  
三、程序代码 Fwfo2   
k*$3i  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL igkz2SI  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) trYTs,KV  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ o'= VZT9  
#if _MSC_VER > 1000 _6LoVS  
#pragma once isK;mU?<  
#endif // _MSC_VER > 1000 %u!XzdG  
#ifndef __AFXWIN_H__ ~L?nq@DL  
#error include 'stdafx.h' before including this file for PCH n^9  ?~  
#endif aW;aA'!  
#include "resource.h" // main symbols k onoI&kV|  
class CHookApp : public CWinApp Vz:_mKA  
{ P:!)9/.2  
 public: \V%_hl  
  CHookApp(); .ER98  
  // Overrides M?@p N<|  
  // ClassWizard generated virtual function overrides _m'ysCjA  
  //{{AFX_VIRTUAL(CHookApp) shFc[A,r}  
 public: H{zPft  
  virtual BOOL InitInstance(); Q:o 7G|C  
  virtual int ExitInstance(); ^%[F8\}XPJ  
  //}}AFX_VIRTUAL NGTe4Crx  
  //{{AFX_MSG(CHookApp) XD%wj  
  // NOTE - the ClassWizard will add and remove member functions here. m4/er539T  
  // DO NOT EDIT what you see in these blocks of generated code ! Z85|I.mr  
  //}}AFX_MSG 0|Uc d  
  DECLARE_MESSAGE_MAP() 8jnz}aBd  
}; 2CLB1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); GjQfi'vCk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U}AX0*S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F[E? A95W  
BOOL InitHotkey(); #g v4  
BOOL UnInit(); {NQo S"  
#endif ?pwE0N^  
@.$MzPQQI  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Y;Y 1+jt  
#include "stdafx.h" ZF{~ih*^u  
#include "hook.h" K0fv( !r{  
#include <windowsx.h> Fdt}..H%  
#ifdef _DEBUG =>LZm+P  
#define new DEBUG_NEW %+tV/7|F  
#undef THIS_FILE ME+em1ZH  
static char THIS_FILE[] = __FILE__; Xr_pgW|  
#endif Zf:]Gq1  
#define MAX_KEY 100 2p< Aj!  
#define CTRLBIT 0x04  ]PX}b  
#define ALTBIT 0x02 aiux^V  
#define SHIFTBIT 0x01 [.cq{6-  
#pragma data_seg("shareddata") >&K!VQ{g  
HHOOK hHook =NULL; 5h^[^*A?  
UINT nHookCount =0; ]Yz'8uts  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !#WqA9<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT +zO]N&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey .Q\\dESn"  
static int KeyCount =0; ZBM!MSf:  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ->oz#  
#pragma data_seg() q627<  
HINSTANCE hins; e}"wL g]  
void VerifyWindow(); J r*"V`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) A 7Y_HIo  
//{{AFX_MSG_MAP(CHookApp) -!dQ)UEP  
// NOTE - the ClassWizard will add and remove mapping macros here. .6T4z7I  
// DO NOT EDIT what you see in these blocks of generated code! 8pe0$r`b  
//}}AFX_MSG_MAP uxDLDA$;  
END_MESSAGE_MAP() a$}6:E  
"tR}j,=S:D  
CHookApp::CHookApp() 9k>uRV6  
{ |]ucHV  
 // TODO: add construction code here, )f*Iomp]@  
 // Place all significant initialization in InitInstance h~UJCn zS  
} u0]q`u/ T  
=cp;Q,t'9L  
CHookApp theApp; #7W.s!#}Dd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Y5%;p33uFG  
{ }$aNOf%:  
 BOOL bProcessed=FALSE; A*0*sZ0  
 if(HC_ACTION==nCode) {ymb\$f  
 { r{ @ `o@q  
  if((lParam&0xc0000000)==0xc0000000){// Key up p":zrf'(6  
   switch(wParam) U[fSQ`&D  
   { hyu}}0:  
    case VK_MENU: _*`q(dYcf  
     MaskBits&=~ALTBIT; !~J WYY  
     break; W_JhNe  
    case VK_CONTROL: O/9fuEF  
     MaskBits&=~CTRLBIT; FfYsSq2l  
     break; +by|  
    case VK_SHIFT: *l!5QG UoK  
     MaskBits&=~SHIFTBIT; g i4  
     break; yq6LH   
    default: //judge the key and send message E fSMFPM  
     break; Oz>io\P94  
   } ^!uO(B&  
   for(int index=0;index<MAX_KEY;index++){ 9dYOH)f  
    if(hCallWnd[index]==NULL) 3B#!2|  
     continue; Au=kSSB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aBlbg3q  
    { X_?%A54z?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); az bUc4M  
     bProcessed=TRUE; SLh~_ 5  
    } e "_"vbk  
   } UK:M:9  
  } 0w}{(P;  
  else if((lParam&0xc000ffff)==1){ //Key down eT\p-4b  
   switch(wParam) l?/gW D^  
   { vnZ/tF  
    case VK_MENU: (`mOB6j  
     MaskBits|=ALTBIT; Pz {Ig  
     break; 7'UWRRsxUF  
    case VK_CONTROL: sZm^&h;  
     MaskBits|=CTRLBIT; $4h04_"  
     break; ~UW{)]_jox  
    case VK_SHIFT: Q9q9<J7j$  
     MaskBits|=SHIFTBIT; (WMLNv  
     break; g& >m P?  
    default: //judge the key and send message 7b,AQ9  
     break; in?T]}  
   } Gx|Dql  
   for(int index=0;index<MAX_KEY;index++) Sy B-iQn  
   { ^Kum%<[i  
    if(hCallWnd[index]==NULL) UP*yeT,P,  
     continue; O 3}P07  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9/H^t* 5t  
    { x`3. Wu\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .-%oDuB5zF  
     bProcessed=TRUE; ]>*I)H)  
    } 6\mC$:F  
   } 2w7@u/OC'  
  } .lG +a!)  
  if(!bProcessed){ _!;\R7]  
   for(int index=0;index<MAX_KEY;index++){ hhj ,rcsi  
    if(hCallWnd[index]==NULL) J{x##p<F$  
     continue; vT}pbOTh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) NIL^UN}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]o!&2:'N`  
   } 6d(b'S^  
  } Y?e3Bx7*b  
 } (ai72#nFtb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C64eDX^  
} -%N}A3m!5  
wEv*1y4  
BOOL InitHotkey() rl41# 6  
{ z22N7W=7  
 if(hHook!=NULL){ P^n{Y~P=Q  
  nHookCount++; ~Gwas0e Na  
  return TRUE; rcW#6VZ=  
 } yT2vO_rH  
 else "rf\' 9=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 0= gF6U  
  if(hHook!=NULL) U(8I+xZ  
   nHookCount++; 7TR' zW2W  
  return (hHook!=NULL); Ic_tc  
} eKS:7:X  
BOOL UnInit() 1=- X<M75  
{ ap{{(y&R  
 if(nHookCount>1){ tTE3H_   
  nHookCount--; X.:_"+I;  
  return TRUE; w7Pe  
 } s}<)B RZi  
 BOOL unhooked = UnhookWindowsHookEx(hHook); B##C{^5A`  
 if(unhooked==TRUE){ ,at-ci\'  
  nHookCount=0; <"{+  
  hHook=NULL; =7H.F:BBG  
 } 64;oB_  
 return unhooked; }% FDm@+  
} Ho:}Bn g  
}.w#X   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dcM+ylB  
{ VQ/ <09e  
 BOOL bAdded=FALSE; ]Oig ..LJ  
 for(int index=0;index<MAX_KEY;index++){ d+1L5}Jn  
  if(hCallWnd[index]==0){ +}`p"<'u  
   hCallWnd[index]=hWnd; W[@"H1bVH  
   HotKey[index]=cKey; ?BXP}]  
   HotKeyMask[index]=cMask; t>m8iS>  
   bAdded=TRUE; he_HVRpB  
   KeyCount++; d#RF0,Y9  
   break; 38OIFT  
  }   zd.1  
 } mJ7 `.  
 return bAdded; /0X0#+kn  
} 'JJ1#kKa  
LZ3rr-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #wq;^)>  
{ F<H`8*q9  
 BOOL bRemoved=FALSE; %'$cH$%~J  
 for(int index=0;index<MAX_KEY;index++){ Ma n^\gkCi  
  if(hCallWnd[index]==hWnd){ b0rt.XB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =]2 b8  
    hCallWnd[index]=NULL; l;.[W|  
    HotKey[index]=0; $@lq}FQ%  
    HotKeyMask[index]=0; ~Q3WBOjn  
    bRemoved=TRUE; }6yxt9  
    KeyCount--; Q';\tGy  
    break; 5EVB27k  
   } }39M_4a&  
  } (e>RNn\  
 } rin >r0o  
 return bRemoved;  -fx(H+  
} S]Yu6FtWiO  
9Ba|J"?Y k  
void VerifyWindow() ,APGPE}I[  
{ 9F-ViDI.  
 for(int i=0;i<MAX_KEY;i++){ HCfS)`  
  if(hCallWnd!=NULL){ hqwz~Ky}  
   if(!IsWindow(hCallWnd)){ 3ZT/>a>@  
    hCallWnd=NULL; 0e[ tKn(  
    HotKey=0; L|dab {9  
    HotKeyMask=0; WW,r9D:/  
    KeyCount--; ]l9,t5Y  
   } s\F EA"w/  
  } z+5u/t  
 } bw<~R2[  
} 4n `[SN  
vV\/pu8  
BOOL CHookApp::InitInstance() UU;Y sj  
{ Y2ah zB  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); s /k  
 hins=AfxGetInstanceHandle(); ?eY chVq  
 InitHotkey(); FRs|!\S=  
 return CWinApp::InitInstance(); >TH-Q[  
} zEA{%)W  
Ply2DQr  
int CHookApp::ExitInstance() RBHqLg(  
{ YGZAtSf3z  
 VerifyWindow(); XACEt~y  
 UnInit(); s%0[DO3NV  
 return CWinApp::ExitInstance(); z[<pi :  
} : .UX[!^  
k;AV;KWI'  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file U)T/.L{0i  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) JXRmu~W~l  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7J)a"d^e  
#if _MSC_VER > 1000 Nys'4kx7  
#pragma once &T| UAM.  
#endif // _MSC_VER > 1000 tCF0Ah  
$bM#\2'  
class CCaptureDlg : public CDialog ta+"lM7A}$  
{ EeF n{_  
 // Construction }]Z,\lA  
 public: Bm2}\KOI  
  BOOL bTray; xu\/]f)  
  BOOL bRegistered; Kuzy&NI^w  
  BOOL RegisterHotkey(); 4 G68WBT  
  UCHAR cKey; &].1[&M]  
  UCHAR cMask; NjCLL`?f  
  void DeleteIcon(); FSXKH{Z  
  void AddIcon(); &p(*i@Ms  
  UINT nCount; qH}62DP3  
  void SaveBmp(); oM? C62g\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Fg}5V,  
  // Dialog Data FB^dp}  
  //{{AFX_DATA(CCaptureDlg) {0m[:af&  
  enum { IDD = IDD_CAPTURE_DIALOG }; E<fwl1<88  
  CComboBox m_Key; n"Z,-./m  
  BOOL m_bControl; ES2d9/]p-  
  BOOL m_bAlt; ^b/q|(Nu&  
  BOOL m_bShift; V!aC#^  
  CString m_Path; VG*=)8{  
  CString m_Number; [fJFH^&?hr  
  //}}AFX_DATA VS@rM<K{  
  // ClassWizard generated virtual function overrides 85d7IB{28  
  //{{AFX_VIRTUAL(CCaptureDlg) pCud` :o"  
 public: ZLFdnC@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); J{'zkR?Lr  
 protected: $=6kh+n@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support EJSgTtp 2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); E6KBpQcd[  
  //}}AFX_VIRTUAL 5{x[EXE'  
  // Implementation  +T8XX@#  
 protected: #Z3I%bkw H  
  HICON m_hIcon; 9zM4D  
  // Generated message map functions @bVh?T0~F,  
  //{{AFX_MSG(CCaptureDlg) |^&2zyUj/  
  virtual BOOL OnInitDialog(); XP Iu]F  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }E\+e!'!2  
  afx_msg void OnPaint(); 5qAE9G!c  
  afx_msg HCURSOR OnQueryDragIcon(); 2H32wpY ,l  
  virtual void OnCancel(); 9FR1Bruf  
  afx_msg void OnAbout(); ]Rys=.!  
  afx_msg void OnBrowse(); dA!f v`,6-  
  afx_msg void OnChange(); ', xs Ugk  
 //}}AFX_MSG }od7YL  
 DECLARE_MESSAGE_MAP() Z ysUz  
}; ]ge^J3az$u  
#endif :_[cT,3  
'| Q*~Lh  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file H9a3 rA>  
#include "stdafx.h" WFc[F`b  
#include "Capture.h" '\vmfp =  
#include "CaptureDlg.h" k-Hfip[ro  
#include <windowsx.h> #I@[^^Vw  
#pragma comment(lib,"hook.lib") g he=mQ-  
#ifdef _DEBUG ,-NLUS "w  
#define new DEBUG_NEW YH'.Yj2  
#undef THIS_FILE :!*;0~#  
static char THIS_FILE[] = __FILE__; uu46'aT  
#endif yl]Cm?8  
#define IDM_SHELL WM_USER+1 Ss#{K;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JqV<A3i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J*4_|j;Z-E  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; yl;$#aZB  
class CAboutDlg : public CDialog mjr{L{H=?+  
{ ."@a1_F|  
 public: Y_iF$ m/R  
  CAboutDlg(); e+[J[<8  
  // Dialog Data A.cZa  
  //{{AFX_DATA(CAboutDlg) z_iyuLRdb  
  enum { IDD = IDD_ABOUTBOX }; M97p.;;  
  //}}AFX_DATA HFCFEamBMP  
  // ClassWizard generated virtual function overrides 'MM~ ~:  
  //{{AFX_VIRTUAL(CAboutDlg) Q9'V&jm  
 protected: 4O,a`:d1$6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support PI<s5bns {  
  //}}AFX_VIRTUAL ,i((;/O6  
  // Implementation j*lWi0Z-  
 protected: q8yJW-GA   
  //{{AFX_MSG(CAboutDlg) P`Wf'C^h  
  //}}AFX_MSG /r 2.j3:l  
  DECLARE_MESSAGE_MAP() U~`^Y8UF  
}; w5JC2   
gJcL{]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) O5n] 4)<  
{ ra#)*fG,~  
 //{{AFX_DATA_INIT(CAboutDlg) aNf3 R;*  
 //}}AFX_DATA_INIT n7YWc5:CaL  
} OG$iZiuf  
E$zq8-p|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {(:)  
{ .`8,$"`4)  
 CDialog::DoDataExchange(pDX); ?g1 .-'  
 //{{AFX_DATA_MAP(CAboutDlg) DB= cc  
 //}}AFX_DATA_MAP #3ro?w  
} vT<wd#  
M/`z;a=EP  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) gJfL$S'w  
 //{{AFX_MSG_MAP(CAboutDlg) 8Nq Iz  
 // No message handlers -bX.4+U  
 //}}AFX_MSG_MAP -(,6w?  
END_MESSAGE_MAP() {mr)n3  
JM4`k8mM  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) )C0X]?   
: CDialog(CCaptureDlg::IDD, pParent)  l e/#J  
{ ?d`+vHK]>  
 //{{AFX_DATA_INIT(CCaptureDlg) Vt2=rD4oJk  
  m_bControl = FALSE; AS-t][m#  
  m_bAlt = FALSE; XA^:n+Yo  
  m_bShift = FALSE; &WV 9%fI  
  m_Path = _T("c:\\"); e:D9;`C  
  m_Number = _T("0 picture captured."); I }I/dh  
  nCount=0; #AnSjl  
  bRegistered=FALSE; +s 0Bt '  
  bTray=FALSE; u5|e9(J  
 //}}AFX_DATA_INIT ^i k|l=  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ~(E8~)f)  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); f9bz:_;W_  
} S#z8H+'  
2gI_*fG1  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) C+IE<=%F  
{ cr;`0  
 CDialog::DoDataExchange(pDX); :iC\#i]6  
 //{{AFX_DATA_MAP(CCaptureDlg) Kt7x'5  
  DDX_Control(pDX, IDC_KEY, m_Key); Ln -?/[E  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~ab_+%  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9 3I9`!e  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $?Mz[X  
  DDX_Text(pDX, IDC_PATH, m_Path); LjAIB(*  
  DDX_Text(pDX, IDC_NUMBER, m_Number); &_^<B7aC'k  
 //}}AFX_DATA_MAP W{/z-&  
} FPFYH?;$  
C)kQi2T  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  F}4 0  
//{{AFX_MSG_MAP(CCaptureDlg) x5Pt\/ow  
 ON_WM_SYSCOMMAND() 6242qb  
 ON_WM_PAINT() !`U<RlK7  
 ON_WM_QUERYDRAGICON() RN3D:b+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) V2* |j8|  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Q 8E~hgO  
 ON_BN_CLICKED(ID_CHANGE, OnChange) /Day5\Q#  
//}}AFX_MSG_MAP {j@)sDM X  
END_MESSAGE_MAP() ?b$zuJ]  
BC[d={_-  
BOOL CCaptureDlg::OnInitDialog() !/Ps}.)A`  
{ LX&P]{q KS  
 CDialog::OnInitDialog(); ^$ bhmJYT  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9\0 K%LL  
 ASSERT(IDM_ABOUTBOX < 0xF000); ;z=C]kI6M  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \Y 4Z Q"0Q  
 if (pSysMenu != NULL) X'4 Yofs  
 { ]V("^.~$+C  
  CString strAboutMenu; D/`E!6Fk=  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Kn\(Xd.>  
  if (!strAboutMenu.IsEmpty()) za/#R_%p  
  { B)`X 7uG  
   pSysMenu->AppendMenu(MF_SEPARATOR); rl7Y=*Dv  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]vFmY  
  } }w8AnaC  
 } B K;w!]  
 SetIcon(m_hIcon, TRUE); // Set big icon 7y7y<`)I5  
 SetIcon(m_hIcon, FALSE); // Set small icon :_zKUv]  
 m_Key.SetCurSel(0); .?j8{>  
 RegisterHotkey(); O{R5<"g  
 CMenu* pMenu=GetSystemMenu(FALSE); jG :R\D}0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); FI5C&d5d  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?R}oXSVT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); s~w+bwr  
 return TRUE; // return TRUE unless you set the focus to a control Al]9/ML/m  
} Q7%#3ML  
8hp]+k_y  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) YTh4&wm  
{ eP?|U.on  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) &Hxr3[+$  
 { *p!dd?8  
  CAboutDlg dlgAbout; Z`KmH.l!  
  dlgAbout.DoModal(); ~.PYS!" +  
 } SLo/7$rct  
 else YR.'JF`C  
 { S7Fxb+{6D  
  CDialog::OnSysCommand(nID, lParam); &3J#"9 _S  
 } {r8CzJ'f  
} ]f~YeOB@  
x"80c(i  
void CCaptureDlg::OnPaint() |i8dI)b  
{ \&90$>h  
 if (IsIconic()) 'wt|buu-H  
 { [9^e u>)A  
  CPaintDC dc(this); // device context for painting jwox?]f+  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); , &SJ?XAs  
  // Center icon in client rectangle WG{/I/bJ_  
  int cxIcon = GetSystemMetrics(SM_CXICON); d`/{0:F  
  int cyIcon = GetSystemMetrics(SM_CYICON); 9@B+$~:}7  
  CRect rect; ?Gfe?  
  GetClientRect(&rect); V:J6eks_  
  int x = (rect.Width() - cxIcon + 1) / 2; Us5 JnP5  
  int y = (rect.Height() - cyIcon + 1) / 2; sSK$  
  // Draw the icon 8msDJ {,X  
  dc.DrawIcon(x, y, m_hIcon); t79MBgZ  
 } Oa .%n9ec  
 else O=/Tx2i;  
 { )Cl&"bX  
  CDialog::OnPaint(); Vba}RF[b  
 } rl=_ "sd=  
} 0iHI "9z  
5ntP{p%>  
HCURSOR CCaptureDlg::OnQueryDragIcon() ja2]VbB  
{ dr o42#$Mo  
 return (HCURSOR) m_hIcon; opC11c/  
} |M_Bbo@ud  
48`<{|r{  
void CCaptureDlg::OnCancel() \tqAv'jA|  
{ $u sU  
 if(bTray) xWm'E2  
  DeleteIcon(); H5{J2M,f  
  CDialog::OnCancel(); wSMgBRV#^  
} CHB{P\WF  
"/"k50%  
void CCaptureDlg::OnAbout() ='j  
{ Z5=!R$4  
 CAboutDlg dlg; V'$ eun  
 dlg.DoModal(); &Te:l-x  
} 0l6%[U?o  
]Y?$[+Y  
void CCaptureDlg::OnBrowse() aRmS{X3  
{ C*!_. <b  
 CString str; .Yx. Lm}  
 BROWSEINFO bi; m.*+0NG  
 char name[MAX_PATH]; Q~kwUZ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); u4'Lm+&O  
 bi.hwndOwner=GetSafeHwnd(); uJ$,e5q  
 bi.pszDisplayName=name; z4goa2@Z  
 bi.lpszTitle="Select folder"; G`z48  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Su7?-vY  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  lzuZv$K  
 if(idl==NULL) HChewrUAn  
  return; 7d*<'k]{,  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); s7?kU3 y=s  
 str.ReleaseBuffer(); A UK7a  
 m_Path=str; Mi/_hzZ\  
 if(str.GetAt(str.GetLength()-1)!='\\') )C@,mgh  
  m_Path+="\\"; Nvi14,q/  
 UpdateData(FALSE); 4 C:YEX~  
} Q8n?7JB  
UPC& O  
void CCaptureDlg::SaveBmp() K&*FI (a  
{ 1jyWP#M#  
 CDC dc; r4sR5p]|  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ?cvv!2B]T  
 CBitmap bm; slx^" BF^  
 int Width=GetSystemMetrics(SM_CXSCREEN); u=[oo @Rk`  
 int Height=GetSystemMetrics(SM_CYSCREEN); (2(hl-- 'n  
 bm.CreateCompatibleBitmap(&dc,Width,Height); h:;~)={"X  
 CDC tdc; Ub$$wOsf  
 tdc.CreateCompatibleDC(&dc); BhjXNf9[  
 CBitmap*pOld=tdc.SelectObject(&bm); ^:0?R/A  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `3-j%H2R  
 tdc.SelectObject(pOld); wK_}`6R/  
 BITMAP btm; SZPu"O\  
 bm.GetBitmap(&btm); /iK )tl|X  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; U uys G\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); = 7?'S#  
 BITMAPINFOHEADER bih; @lX)dY  
 bih.biBitCount=btm.bmBitsPixel; l;2bBx7vW  
 bih.biClrImportant=0; F-Ea85/K@4  
 bih.biClrUsed=0; ;H^!yj5H  
 bih.biCompression=0;  4Zq5  
 bih.biHeight=btm.bmHeight; |z~?"F6 Y<  
 bih.biPlanes=1; :97`IV%  
 bih.biSize=sizeof(BITMAPINFOHEADER); T2d pn%I  
 bih.biSizeImage=size; O6pjuhMx  
 bih.biWidth=btm.bmWidth; H{BjxZ~)  
 bih.biXPelsPerMeter=0; %lPP1 R  
 bih.biYPelsPerMeter=0; Uu(W62  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); y^ :x2P  
 static int filecount=0; [{ pc1U-  
 CString name; BK{8\/dg  
 name.Format("pict%04d.bmp",filecount++); ihnM`TpMJ  
 name=m_Path+name; (_T&2%  
 BITMAPFILEHEADER bfh; u-Vnmig9  
 bfh.bfReserved1=bfh.bfReserved2=0; r?Vob}'Pt]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); dM') < lF  
 bfh.bfSize=54+size; N%-nxbI\  
 bfh.bfOffBits=54; [Y*UCFhI0  
 CFile bf; ubL Lhf  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .28*vkH%C=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {^qc`oF  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Eq?o /'e  
  bf.WriteHuge(lpData,size); fTeo,N  
  bf.Close(); )Mok$  
  nCount++; EW`3h9v~  
 } !|!V}O  
 GlobalFreePtr(lpData); $`  
 if(nCount==1) >C i=H(8vN  
  m_Number.Format("%d picture captured.",nCount); mF1oY[xa_  
 else &ke4":7X  
  m_Number.Format("%d pictures captured.",nCount); ";~#epPkX  
  UpdateData(FALSE); /[q@=X&  
} k5($b{  
*<@  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) g41LpplX  
{ f,1rmX1  
 if(pMsg -> message == WM_KEYDOWN) 5Z:HCp-aG  
 { ZoUfQ!2*  
  if(pMsg -> wParam == VK_ESCAPE) l|K8+5L  
   return TRUE; |J\/U,nh  
  if(pMsg -> wParam == VK_RETURN) B}(YD;7vJ  
   return TRUE; FD*y[A ?  
 } =k_u5@.Z  
 return CDialog::PreTranslateMessage(pMsg); K!9=e7|P  
} m$^7sFD$  
'>6-ie^0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L.R  
{ 2Zm*f2$xM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ fZZ!kea[  
  SaveBmp(); E'ZWSpP  
  return FALSE; ~ce.&C7cR  
} p|((r?{  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ LOA 90.D  
 CMenu pop; gO5;hd[ l  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); _:g V7>S?  
 CMenu*pMenu=pop.GetSubMenu(0); 1pn167IQL  
 pMenu->SetDefaultItem(ID_EXITICON); .D)}MyKnu  
 CPoint pt; 1>2397  
 GetCursorPos(&pt); kO.rgW82  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ._yr7uY[M  
 if(id==ID_EXITICON) 0Zq" -  
  DeleteIcon(); HwcGbbX)  
 else if(id==ID_EXIT) eAqQ~)8^  
  OnCancel(); l YhwV\3  
 return FALSE; FLWz7Rj  
} g R6:J  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); nuQ"\ G  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) KDhHp^IXQ  
 AddIcon(); =19]a  
 return res; "P|G^*"~2  
} d0xV<{,-  
 }QI*Ns  
void CCaptureDlg::AddIcon() `A'*x]l  
{ X#o:-FKf  
 NOTIFYICONDATA data; ABSeX  
 data.cbSize=sizeof(NOTIFYICONDATA); A=])pYE1  
 CString tip; 8RK\B%UW  
 tip.LoadString(IDS_ICONTIP); QdRMp n}q  
 data.hIcon=GetIcon(0); JDP#tA3  
 data.hWnd=GetSafeHwnd(); 0I k@d'7  
 strcpy(data.szTip,tip); s?2;u p*D  
 data.uCallbackMessage=IDM_SHELL; KyDBCCOv  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; xs:{%ki  
 data.uID=98; F 6Ol5  
 Shell_NotifyIcon(NIM_ADD,&data); u Qj#U m8  
 ShowWindow(SW_HIDE); )SQ g  
 bTray=TRUE; ge` J>2  
} jm?mO9p~  
MG<~{Y84}  
void CCaptureDlg::DeleteIcon() X6;aF ;"5  
{ xXbW6aI"  
 NOTIFYICONDATA data; QQw^c1@  
 data.cbSize=sizeof(NOTIFYICONDATA); vi2xonq^  
 data.hWnd=GetSafeHwnd(); t_N `e(V  
 data.uID=98; g(`6cY[}  
 Shell_NotifyIcon(NIM_DELETE,&data); i^> RjR  
 ShowWindow(SW_SHOW); *qqFIp^  
 SetForegroundWindow(); @s/ qOq?  
 ShowWindow(SW_SHOWNORMAL); h"'f~KM9a>  
 bTray=FALSE; s.~SV"  
} 4>|5B:  
4[#.N 3Y4*  
void CCaptureDlg::OnChange() ,^[s4 =3X?  
{ /j^zHrLN  
 RegisterHotkey(); GZ e )QH  
} ?=vwr,ir  
KIS.4nt#d"  
BOOL CCaptureDlg::RegisterHotkey() XkD_SaL}  
{ v ipmzg(S  
 UpdateData(); zb4g\H 0  
 UCHAR mask=0; ^KlOD_GN|  
 UCHAR key=0; h~1QmEat  
 if(m_bControl) 9W8Dp?:  
  mask|=4; &><`?  
 if(m_bAlt) fx|9*|E  
  mask|=2; ^?A+`1-  
 if(m_bShift) -Av/L>TxlI  
  mask|=1; RS1oPY  
  key=Key_Table[m_Key.GetCurSel()]; =f["M=)ZJ  
 if(bRegistered){ ,t[D1KZt  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask);  ^ "f  
  bRegistered=FALSE; f]lDJ?+ M  
 } zPXd]jIwV  
 cMask=mask; :JS} (  
 cKey=key; *vb)d0}P  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (UM+?]Qwy  
 return bRegistered; #i,O "`4  
} v:>P;\]r9M  
`Ctj]t  
  四、小结 HlO+^(eX  
Ju\"l8[f  
  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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