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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: n:] 1^wX#  
  glIIJ5d|,  
  一、实现方法 1D DOUV  
8Y'"=!3  
  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: <OB~60h"  
> PA,72e   
#pragma data_seg("shareddata") 6VE5C g  
HHOOK hHook =NULL; //钩子句柄 h(up1(x  
UINT nHookCount =0; //挂接的程序数目 >?FCv7qN  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 8nR,GW\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 P$(}}@  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey $o H,:x?}  
static int KeyCount =0; @b({QM|  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Q(7l<z  
#pragma data_seg() _3>zi.J/  
zjE4v-H:l  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 cNv c pv  
( "z;Q?(  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: S3wH M  
9hpM*wt  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR YJsi5  
cKey,UCHAR cMask) RjHpC7b*%  
{ ?!-im*~w  
 BOOL bAdded=FALSE; wB"Gw` D  
 for(int index=0;index<MAX_KEY;index++){ 5(Oc"0''H  
  if(hCallWnd[index]==0){ FQl|<l6  
   hCallWnd[index]=hWnd; AW68'G*m  
   HotKey[index]=cKey; hKYPH?b%  
   HotKeyMask[index]=cMask; I%xJ)fIK  
   bAdded=TRUE; 8 \Oiv$r  
   KeyCount++; 4tWI)}+ak  
   break; H4jqF~  
  } 4/_|Qy  
 } E v#aMK  
 return bAdded; . %7A7a  
} 4f,x@:Jw  
//删除热键 PCjY,O  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n3,wwymQ  
{ gu&oCT  
 BOOL bRemoved=FALSE; NE"fyX`  
 for(int index=0;index<MAX_KEY;index++){ A>yIH)b  
  if(hCallWnd[index]==hWnd){ T667&@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ L\DaZ(Y  
    hCallWnd[index]=NULL; < Ifnf 6~  
    HotKey[index]=0; b*fflJ  
    HotKeyMask[index]=0; " z{w^k  
    bRemoved=TRUE; _r'M^=yx[  
    KeyCount--; 3J<,2  
    break; ,iUx'U  
   } 4pv :u:Z  
  } P#PQ4uK \  
 } ?Pc 3*.  
 return bRemoved; p7er04/}\  
} BZ9iy~  
"dTXT  
~yN,FpD  
  DLL中的钩子函数如下: yjzNU5F  
Xi.?9J`@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2O/_hv.  
{ 3s2M$3r)6  
 BOOL bProcessed=FALSE; ,pz CJ@5  
 if(HC_ACTION==nCode) *Cw2h  
 { SGm? "esEt  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 9_{!nQC.g  
   switch(wParam) [DwB7l)O(  
   {  c2/HY8ttRD  
    case VK_MENU: #J_i 5KmXJ  
     MaskBits&=~ALTBIT; ^ EOjq  
     break; -&}E:zoe  
    case VK_CONTROL: OFv} jT  
     MaskBits&=~CTRLBIT; 566Qik w2  
     break; lfP|+=^B  
    case VK_SHIFT: pkx>6(Y  
     MaskBits&=~SHIFTBIT; ri ~2t3gg  
     break; IIkJ"Qg.  
    default: //judge the key and send message f'dI"o&^/d  
     break;  Km7  
   } $(U|JR@  
   for(int index=0;index<MAX_KEY;index++){ 9j`-fs@:  
    if(hCallWnd[index]==NULL) |{T2|iJI  
     continue; }__+[-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A$cbH.  
    { h;->i]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -yeT$P&|  
     bProcessed=TRUE; ZI7<E  
    } 6tguy  
   } c^y 1s*  
  } _rd{cvdR  
  else if((lParam&0xc000ffff)==1){ //有键按下 -}@9lhS,  
   switch(wParam) {W]jVh p  
   { AK HH{_  
    case VK_MENU: s?Kn,6Y  
     MaskBits|=ALTBIT; }T,uw8?f!  
     break; CggEAi~  
    case VK_CONTROL: O;2 u1p'iP  
     MaskBits|=CTRLBIT; b3+PC$z2h  
     break; S6]':  
    case VK_SHIFT: tS$Ne7yk e  
     MaskBits|=SHIFTBIT; 4KCxhJq  
     break; L@XeAEIq  
    default: //judge the key and send message \~PFD%]:3  
     break; ?F/3]lsggT  
   } *rLs!/[Z_  
   for(int index=0;index<MAX_KEY;index++){ )T?ryp3ev  
    if(hCallWnd[index]==NULL) KXJHb{?  
     continue; @zbXG_J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }8HLyK,4  
    { i7FEjjGtG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :z\STXq  
     bProcessed=TRUE; \+xsJbEV  
    } 4"sP= C  
   } c'b,=SM  
  } ~"k'T9QBY  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D6w0Y:A{.  
   for(int index=0;index<MAX_KEY;index++){ 7nmo p7  
    if(hCallWnd[index]==NULL) z( wXs&z;  
     continue; {/ta1&xyG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) '' 6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]NCOi ?Odx  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 s6B@:9  
   } /03>|Juo  
  } r`2& o  
 } \ (,2^T'$J  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H< j+-u4b  
} t(Uoi~#[  
#XsqTK_nk  
  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: 9L};vkYk#  
|NI0zd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?@_dx=su  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~J|0G6H  
V;"'!dVX  
  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: nFqMS|EN  
LdOB[W  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Dng^4VRd  
{ >qE$:V "_5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) GOt@x9%  
 { /?sV\shy  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 [# :k3aFz  
  SaveBmp(); Ev%\YI!MaY  
  return FALSE; <$ 5\^y,V  
 } 3r\QLIr L8  
 …… //其它处理及默认处理 o! 8X< o  
} Z]tz<YSkG  
\4ZQop  
wQ5__"D  
  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。 yC[}gHv  
&~i1 @\]  
  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。 *4ID$BmO  
G.Q+"+* ^  
  二、编程步骤 8PQt8G.  
/W9=7&R0  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; <XNLeJdY  
y.zW>Mfl  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; { }z7N~  
r* U6govky  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Z1Wra-g  
CV k8MA  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; B4hR3%  
0^+W"O  
  5、 添加代码,编译运行程序。  ZM"t.  
:z[SI{Y  
三、程序代码 <%5ny!]  
M<SZ7^9<  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL {S?.bT%&  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 4h|vd.t  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]?^mb n  
#if _MSC_VER > 1000 s SDBl~g  
#pragma once j0J6ySlY  
#endif // _MSC_VER > 1000 OA_ %%A;o  
#ifndef __AFXWIN_H__ !>M: G:K  
#error include 'stdafx.h' before including this file for PCH EB \\ F  
#endif sS._N@f  
#include "resource.h" // main symbols x`4">:IA  
class CHookApp : public CWinApp hQ9VcS6=gD  
{ , vWcWT  
 public: c5JxKU_  
  CHookApp(); k{; 2*6b0  
  // Overrides i]P]o)  
  // ClassWizard generated virtual function overrides #soWX_>  
  //{{AFX_VIRTUAL(CHookApp) &a V`u?'e  
 public: zJPzI{-w|  
  virtual BOOL InitInstance(); ;X8eZQ  
  virtual int ExitInstance(); ).\%a h  
  //}}AFX_VIRTUAL 8IO4>CMkv  
  //{{AFX_MSG(CHookApp) '2eggX%  
  // NOTE - the ClassWizard will add and remove member functions here. HJDM\j*5  
  // DO NOT EDIT what you see in these blocks of generated code ! _f/6bpv  
  //}}AFX_MSG |1#*`2j\=9  
  DECLARE_MESSAGE_MAP() ~x2azY2DP  
}; YM-,L-HMA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -Wf 2m6t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )<%GHDWL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {<V{0 s%  
BOOL InitHotkey(); 7"1M3P5*8  
BOOL UnInit(); Gx!Y 4Q}-  
#endif o<Q~pd#Ip,  
Wh,p$|vL  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. `rvS(p[s  
#include "stdafx.h" {q:6;yzxl  
#include "hook.h" 3qP! (*  
#include <windowsx.h> nBR4j?':i  
#ifdef _DEBUG yN9/'c~  
#define new DEBUG_NEW Mp}U>+8  
#undef THIS_FILE #}o*1  
static char THIS_FILE[] = __FILE__; }5`Kn}rY  
#endif -GH>12YP  
#define MAX_KEY 100 :U=*@p4?  
#define CTRLBIT 0x04 dW6sA65<Y  
#define ALTBIT 0x02 MGK%F#PM  
#define SHIFTBIT 0x01 T)MKhK9\Ab  
#pragma data_seg("shareddata") nPE{Gp) }  
HHOOK hHook =NULL; {;q zz9 |  
UINT nHookCount =0; Nzf tc  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ) }(Po_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT m;'ebkq  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey w=,bF$:fIW  
static int KeyCount =0; C h>r.OfP  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 5 y0 N }}  
#pragma data_seg() wZ0RI{)s'  
HINSTANCE hins; 1 Qln|b8<  
void VerifyWindow(); ]@0C1 r  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) )1N~-VuT  
//{{AFX_MSG_MAP(CHookApp) *|Tx4Qt  
// NOTE - the ClassWizard will add and remove mapping macros here. P`^nNX]x+,  
// DO NOT EDIT what you see in these blocks of generated code! kZ$2Uss  
//}}AFX_MSG_MAP dSkMA  
END_MESSAGE_MAP() ;X, A|m$(  
;0FfP  
CHookApp::CHookApp() Qhy!:\&1  
{ 5<YV`T{5Kl  
 // TODO: add construction code here, -%,=%FBi~4  
 // Place all significant initialization in InitInstance g%TOYZr!X  
} evjj~xkte  
sFt"2TVr3  
CHookApp theApp; l|v`B6(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) S"H djEF7\  
{ pLSh +*F  
 BOOL bProcessed=FALSE; \xG_q>1_  
 if(HC_ACTION==nCode) LGB}:;$AL  
 { c^3,e/H  
  if((lParam&0xc0000000)==0xc0000000){// Key up iSbPOC7  
   switch(wParam) Ogv9_ X8  
   { 42M_  %l_  
    case VK_MENU: 4( $p8J  
     MaskBits&=~ALTBIT; MQ#k`b#()  
     break; 2)hfYLi  
    case VK_CONTROL: Y O&@  
     MaskBits&=~CTRLBIT; ]n}aePl}oU  
     break; SP.k]@P  
    case VK_SHIFT: Wz%H?m:g#  
     MaskBits&=~SHIFTBIT; KT[ZOtu  
     break; ,<k%'a!B  
    default: //judge the key and send message 6%it`A8}  
     break; :CLWmMC_  
   } r3  qKT  
   for(int index=0;index<MAX_KEY;index++){ GXG 7P,p,  
    if(hCallWnd[index]==NULL) >$,P )cB'  
     continue; .dI".L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #lR-?Uh  
    { $Q"D>Qf{G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 'Fy"|M;2  
     bProcessed=TRUE; 9TX2h0U?  
    } X!_&%^L'  
   } e>6|# d  
  } @Bds0t  
  else if((lParam&0xc000ffff)==1){ //Key down A3)"+`&PUl  
   switch(wParam) pT{is.RM  
   { 3^[P  
    case VK_MENU: =^1jVaAL  
     MaskBits|=ALTBIT; EQN)y27poW  
     break; tk]D)+{u&c  
    case VK_CONTROL: i\<S ;  
     MaskBits|=CTRLBIT; k4a51[SYBK  
     break; (n`] sbx  
    case VK_SHIFT: ,Qx]_gZ`  
     MaskBits|=SHIFTBIT; Idb*,l|<  
     break; M287Z[  
    default: //judge the key and send message ~7 `,}) d  
     break; G9NI`]k  
   } f0vO(@I  
   for(int index=0;index<MAX_KEY;index++) D=Q.Q  
   { >$7x]f  
    if(hCallWnd[index]==NULL) Y?TS,   
     continue; $C.a@gm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1RJFPv  
    { d(|q&b:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~Oa$rqu%m  
     bProcessed=TRUE; NB1KsvD{  
    } 1Y87_o'd  
   } u?" ="-^  
  } e8rZP(g&g  
  if(!bProcessed){ 10fxK  
   for(int index=0;index<MAX_KEY;index++){ d7Vp^^}(  
    if(hCallWnd[index]==NULL) U$mDAi$  
     continue; hw,nA2w\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Vm|KL3}NRv  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G<M0KU (  
   } d\uN  
  } =WjHf8v;  
 } OHi.5 (  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); yI1 :L -  
} T? Kh '  
t5%cpkgh4  
BOOL InitHotkey() <4+P37^ ~  
{ KF zI27r  
 if(hHook!=NULL){ Ym 1vq=  
  nHookCount++; <Xl#}6II  
  return TRUE; %ggf|\ -e  
 } P&sWn?q Ol  
 else XHekz6_  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); s EFQ8S  
  if(hHook!=NULL) @QV0l]H0+  
   nHookCount++; H.\`(`6  
  return (hHook!=NULL); @Wc5r#  
} Bhxs(NO  
BOOL UnInit() yI 2UmhA  
{ 3("C'(W  
 if(nHookCount>1){ KEtV  
  nHookCount--; /1MmOB  
  return TRUE; "aOs#4N  
 } RqgN<&g?  
 BOOL unhooked = UnhookWindowsHookEx(hHook); BbI%tmA7  
 if(unhooked==TRUE){ b%0p<*:a/  
  nHookCount=0; 2uOYuM[7gH  
  hHook=NULL; (oi:lC@h*  
 } 6LBdTnzUd  
 return unhooked; T[Zs{S  
} HwHF8#D*l  
'|DW#l\n  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lFGuQLuqA{  
{ *{3d+j/?/  
 BOOL bAdded=FALSE; lG)wa  
 for(int index=0;index<MAX_KEY;index++){ \P*_zd@%  
  if(hCallWnd[index]==0){ QkBw59L7  
   hCallWnd[index]=hWnd; Jqj!k*=/  
   HotKey[index]=cKey; cc|W1,q  
   HotKeyMask[index]=cMask; Fp/{L  
   bAdded=TRUE; C3}:DIn"w  
   KeyCount++; eAfi!!Z<  
   break; |tGUx*NN  
  } 6N#hN)/  
 } `Gqe]ZE#"  
 return bAdded; Q,[G?vbj  
} xj3 qOx$  
WeM38&dWY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kJJT`Ba&/  
{ au{) 5W4~  
 BOOL bRemoved=FALSE; '{"Rjv7  
 for(int index=0;index<MAX_KEY;index++){ V4+ |D2   
  if(hCallWnd[index]==hWnd){ #RBrii-,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ UJL2IF-x  
    hCallWnd[index]=NULL; 1uAjy(y  
    HotKey[index]=0; +nE>)ZH  
    HotKeyMask[index]=0; nF@**,C Q  
    bRemoved=TRUE; OP`f[lCiL  
    KeyCount--; hx9{?3#  
    break; --WQr]U/  
   } /K#k_k  
  } I8Aq8XBw  
 } 8:$h&aBI  
 return bRemoved; } ?j5V  
} @@AL@.*  
w}ji]V}  
void VerifyWindow() krUtOVI  
{ xqt?z n  
 for(int i=0;i<MAX_KEY;i++){ M7TLQqaF  
  if(hCallWnd!=NULL){ 2!{D~Gfl=  
   if(!IsWindow(hCallWnd)){ /'sv7hg+  
    hCallWnd=NULL; w\)K0RN  
    HotKey=0; 4yyw:"  
    HotKeyMask=0; i "h\*B=  
    KeyCount--; w:t~M[kTW  
   } ./#YUIC  
  } h[W`P%xZ  
 } AELj"=RA  
} "+(|]q"W  
4>d4g\Z0L  
BOOL CHookApp::InitInstance() 'JOUx_@z  
{ ;7'O=%  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); $Zu?Gd?  
 hins=AfxGetInstanceHandle(); +V4)><  
 InitHotkey(); PVIOe}N  
 return CWinApp::InitInstance(); UxGu1a  
} o-\h;aQJ  
^%r6+ey  
int CHookApp::ExitInstance() J$#T_4 )  
{ ?9`j1[0  
 VerifyWindow(); 1Gsh%0r3  
 UnInit(); iXDG-_K  
 return CWinApp::ExitInstance(); i#'K7XM2  
} MgeC-XQM  
], lLD UZ\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file C%z)D1-  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Tqt-zX|>  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ danPy2  
#if _MSC_VER > 1000 K!6T8^JH  
#pragma once W'C>Fn}lO?  
#endif // _MSC_VER > 1000 7hHID>,o9%  
0V:H/qu8>  
class CCaptureDlg : public CDialog |'h (S|  
{ _4by3?<c  
 // Construction B!wN%> U  
 public: \u,CixV=  
  BOOL bTray; Db|f"3rq?  
  BOOL bRegistered; $e\s8$EO  
  BOOL RegisterHotkey(); bo\ bs1  
  UCHAR cKey; 76l. {TXF  
  UCHAR cMask; &<t%u[3  
  void DeleteIcon(); `NIb? /!f  
  void AddIcon(); QTHY{:Rmu  
  UINT nCount; 4fi4F1f  
  void SaveBmp(); mkSu $c  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor A (2 0+  
  // Dialog Data 74([~Qs _M  
  //{{AFX_DATA(CCaptureDlg) |5^ iqW  
  enum { IDD = IDD_CAPTURE_DIALOG }; C m:AU;  
  CComboBox m_Key; bBi>BP =  
  BOOL m_bControl; %p 6Ms  
  BOOL m_bAlt; s~Eo]e  
  BOOL m_bShift; U1YqyG8  
  CString m_Path; Y/sav;  
  CString m_Number; 'gY?=,dF>  
  //}}AFX_DATA SY,ns*>1F  
  // ClassWizard generated virtual function overrides nt2b}u>*  
  //{{AFX_VIRTUAL(CCaptureDlg) I): c#  
 public:  "9;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); j,OA>{-$  
 protected: d]E=w6 +;Q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .#&)%}GC  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); tj;47UtH  
  //}}AFX_VIRTUAL y4kn2Mw;  
  // Implementation 7J);{ &x9h  
 protected: sPNm.W$_  
  HICON m_hIcon; .q 2r!B  
  // Generated message map functions Bl+\|[yd  
  //{{AFX_MSG(CCaptureDlg) uuM1_nD[  
  virtual BOOL OnInitDialog(); HM% +Y47a  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); U^_\V BAk  
  afx_msg void OnPaint(); x// uF  
  afx_msg HCURSOR OnQueryDragIcon(); W> TG?hH  
  virtual void OnCancel(); ^&;,n.X5Z  
  afx_msg void OnAbout(); K@p9_K8  
  afx_msg void OnBrowse(); ^]o H}lwO  
  afx_msg void OnChange(); n/v.U,f&l@  
 //}}AFX_MSG Yi9Y`~J  
 DECLARE_MESSAGE_MAP() -|V#U`mwF  
}; ;Rv WF )  
#endif o33t~@RX  
- +a,Ej  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file iQO4IT   
#include "stdafx.h" "~VKUvDu  
#include "Capture.h" T={!/y+  
#include "CaptureDlg.h" k~ )CJ6}  
#include <windowsx.h> "nz\YQdg  
#pragma comment(lib,"hook.lib") ^li3*#eT  
#ifdef _DEBUG G&h@  
#define new DEBUG_NEW F:jNv3W1  
#undef THIS_FILE +(!/(2>~  
static char THIS_FILE[] = __FILE__; ;L$ -_Z  
#endif -7!L]BcZ.  
#define IDM_SHELL WM_USER+1 V?OTP&+J%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |M?s[}ll  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,=e.Q AF!"  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; VP!4Nob  
class CAboutDlg : public CDialog ;gL{*gR]S  
{ Tv#d>ZSD  
 public: q]1p Q)\'p  
  CAboutDlg(); .c>6}:ye  
  // Dialog Data ViW2q"4=  
  //{{AFX_DATA(CAboutDlg) E,d<F{=8,o  
  enum { IDD = IDD_ABOUTBOX }; %f<>Kwr`2  
  //}}AFX_DATA +o@:8!IM1  
  // ClassWizard generated virtual function overrides `a52{Wa  
  //{{AFX_VIRTUAL(CAboutDlg) Ab[o~X"  
 protected: A,&711Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Lv@WI6DM  
  //}}AFX_VIRTUAL =oVC*b  
  // Implementation 0to`=;JI  
 protected: bj`GGxzOb  
  //{{AFX_MSG(CAboutDlg) iuj%.}  
  //}}AFX_MSG ]Sj;\Iz  
  DECLARE_MESSAGE_MAP() NU_^*@k  
}; a;bmlV04  
4Q#{,y944  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) yR~$i3Z*  
{ ?<F([(  
 //{{AFX_DATA_INIT(CAboutDlg) &IXmy-w  
 //}}AFX_DATA_INIT 7#wB  
} yT:2*sZRc  
WZ`i\s1#  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) gaC4u,Zb  
{ R1 SFMI   
 CDialog::DoDataExchange(pDX); n;Mk\*Cg  
 //{{AFX_DATA_MAP(CAboutDlg) 4"|3pMr  
 //}}AFX_DATA_MAP T}{zh  
} wdt2T8`I/  
?#a&eW  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Jqzw94  
 //{{AFX_MSG_MAP(CAboutDlg) 2ih}?%H8  
 // No message handlers Syseiw  
 //}}AFX_MSG_MAP _8r'R  
END_MESSAGE_MAP() q{V e%8$"  
/t`|3Mw  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) e<uf)K=(C  
: CDialog(CCaptureDlg::IDD, pParent) 0Sk~m4fj(  
{ w;Azxcw  
 //{{AFX_DATA_INIT(CCaptureDlg) %AJ9fs4/  
  m_bControl = FALSE; V5-!w0{  
  m_bAlt = FALSE; %h(%M'm?  
  m_bShift = FALSE; IG|u;PH<  
  m_Path = _T("c:\\"); ogSDV   
  m_Number = _T("0 picture captured."); t ]Ln(r  
  nCount=0; T*@o?U  
  bRegistered=FALSE; Z796;qk  
  bTray=FALSE; X2I_,k'fQ  
 //}}AFX_DATA_INIT Q_p&~PNy5  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Vo^J2[U  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);  RSj8T<  
} ?7pn%_S  
tq,^!RSbZ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) &x B^  
{ E$z-|-{>  
 CDialog::DoDataExchange(pDX); A",}Ikh='`  
 //{{AFX_DATA_MAP(CCaptureDlg) ;F- mt(Y  
  DDX_Control(pDX, IDC_KEY, m_Key); lH?jqp  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5nBJj  
  DDX_Check(pDX, IDC_ALT, m_bAlt); %5+X  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); %CYo, e  
  DDX_Text(pDX, IDC_PATH, m_Path); !"<rlB,J  
  DDX_Text(pDX, IDC_NUMBER, m_Number); )H]L/n  
 //}}AFX_DATA_MAP G6{'|CV  
} x>mI$K(6M  
&Jb$YKt  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) LUxDP#~7  
//{{AFX_MSG_MAP(CCaptureDlg) &?Erkc~#  
 ON_WM_SYSCOMMAND() \VEnP=*:W  
 ON_WM_PAINT() JFc, f  
 ON_WM_QUERYDRAGICON() A@_>9;   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _vb'3~'S  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;=IJHk1&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) yogL8V-^4  
//}}AFX_MSG_MAP ` ;mQ"lO  
END_MESSAGE_MAP() K_ymA,&()  
d0}(d Gl  
BOOL CCaptureDlg::OnInitDialog() K"t?  
{ yKrb GK*=_  
 CDialog::OnInitDialog(); BI%~0 Gj8  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -1B.A  
 ASSERT(IDM_ABOUTBOX < 0xF000); 6ERMn"[_w  
 CMenu* pSysMenu = GetSystemMenu(FALSE); e(0 cz6  
 if (pSysMenu != NULL) &`s{-<t<L  
 { :qqG%RB  
  CString strAboutMenu; nu+^D$ait  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 3rFku"z T$  
  if (!strAboutMenu.IsEmpty()) |xZu?)M4  
  { `peR,E  
   pSysMenu->AppendMenu(MF_SEPARATOR); 0+qC_ISns  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); o:cTc:l)  
  } @,= pG  
 } ,J+L_S+B~  
 SetIcon(m_hIcon, TRUE); // Set big icon ?(R#  
 SetIcon(m_hIcon, FALSE); // Set small icon &qPezyt  
 m_Key.SetCurSel(0); A0@,^|]  
 RegisterHotkey(); FXY>o>K%h  
 CMenu* pMenu=GetSystemMenu(FALSE); 8<0P Ssx  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); P 0+@,kM  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ZZ{c  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); T#!% Uzz  
 return TRUE; // return TRUE unless you set the focus to a control U5-8It2OR  
} .]KC*2  
f^hJAZ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) z]hRc8 g}d  
{ ?mC'ZYQI  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) kmTYRl )j  
 { gfN=0Xj4  
  CAboutDlg dlgAbout; \kUQe-:he  
  dlgAbout.DoModal(); gQSVPbzK  
 } '?m2|9~  
 else 8Uh|V&  
 { 5tkKd4VfL  
  CDialog::OnSysCommand(nID, lParam); hR0a5   
 } ud)WH|Z  
} \WnTpl>B  
) YwEl72c  
void CCaptureDlg::OnPaint() .H M3s  
{ W //+[  
 if (IsIconic()) hTO 2+F*  
 { Va.TUz4  
  CPaintDC dc(this); // device context for painting Md>C!c  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); #E=8kbD7  
  // Center icon in client rectangle vf>d{F^rv  
  int cxIcon = GetSystemMetrics(SM_CXICON); Bi;a~qE  
  int cyIcon = GetSystemMetrics(SM_CYICON); }OnU32P  
  CRect rect; >oyf i:  
  GetClientRect(&rect); bcT_YFLQ  
  int x = (rect.Width() - cxIcon + 1) / 2; YWd2bRb  
  int y = (rect.Height() - cyIcon + 1) / 2; `)]W~  
  // Draw the icon ]smu~t0\  
  dc.DrawIcon(x, y, m_hIcon); ; xw9#.d#D  
 } _~CJitR3  
 else z8S]FpM6  
 { Z/:yYSq  
  CDialog::OnPaint(); E Lq1   
 } 6rmx{Bt  
} z<!A;.iD  
r6Vw!^]8u8  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;aD~1;q  
{ \VIY[6sn\M  
 return (HCURSOR) m_hIcon; D5Sbs(  
} 60%fva  
i83Jy w,f  
void CCaptureDlg::OnCancel() N lm}'Xt  
{ Bx}"X?%S  
 if(bTray) _nzq(m1@  
  DeleteIcon(); ,MJddbcg  
  CDialog::OnCancel(); [cEGkz  
} 9'~qA(=.?  
8/)q$zs  
void CCaptureDlg::OnAbout() %YF /=l  
{ Hr}"g@ <  
 CAboutDlg dlg; WhH60/`  
 dlg.DoModal(); "38<14V  
} !.V_?aYi8  
O"TVxP:  
void CCaptureDlg::OnBrowse() S=V  
{ Ufi#y<dP  
 CString str; @,Dnl v|?  
 BROWSEINFO bi; v+sF0 j\P  
 char name[MAX_PATH]; *wmkcifF;  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); nIBeZof  
 bi.hwndOwner=GetSafeHwnd(); qA!4\v={  
 bi.pszDisplayName=name; {df;R|8 l  
 bi.lpszTitle="Select folder"; xo @|;Z>&F  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /{8Y,pZbu  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @##}zku  
 if(idl==NULL) 4mp)v*z  
  return; CpX[8>&osD  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); {P?DkUO}  
 str.ReleaseBuffer(); t xnH~;(  
 m_Path=str; t'W6Fmwkx  
 if(str.GetAt(str.GetLength()-1)!='\\') B[8 RBTsA  
  m_Path+="\\"; 7yg {0a  
 UpdateData(FALSE); &``nD  
} ]P7gEBi  
5lzbg   
void CCaptureDlg::SaveBmp() B3[X{n$px  
{ B$s6|~  
 CDC dc; a}VR>!b  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); OraT$lV)_  
 CBitmap bm; N@k' s   
 int Width=GetSystemMetrics(SM_CXSCREEN); @(x]+*)  
 int Height=GetSystemMetrics(SM_CYSCREEN); AZNo%!)o  
 bm.CreateCompatibleBitmap(&dc,Width,Height); LHOt(5VY  
 CDC tdc; kn3GgdU  
 tdc.CreateCompatibleDC(&dc);  FO!0TyQ  
 CBitmap*pOld=tdc.SelectObject(&bm); "3Dnp?gB  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \&V[<]  
 tdc.SelectObject(pOld); Dvz 6 E  
 BITMAP btm; VY~*QF~P  
 bm.GetBitmap(&btm); =|$U`~YB  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; L&NpC&>wD  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); qx >Z@o  
 BITMAPINFOHEADER bih; ';v2ld 9  
 bih.biBitCount=btm.bmBitsPixel; uW[AnQ1w  
 bih.biClrImportant=0; /#_[{lSr?  
 bih.biClrUsed=0; 13 JG[,w  
 bih.biCompression=0; ;2fzA<RkK  
 bih.biHeight=btm.bmHeight; FChW`b&S  
 bih.biPlanes=1; xk8NX-:  
 bih.biSize=sizeof(BITMAPINFOHEADER); G;t< dJ8  
 bih.biSizeImage=size; u|ihUE!h  
 bih.biWidth=btm.bmWidth; 32J/   
 bih.biXPelsPerMeter=0; <daH0l0  
 bih.biYPelsPerMeter=0; 3~WI3ZIR  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); A9DFZZ0  
 static int filecount=0; +dq2}gM  
 CString name; R"t2=3K  
 name.Format("pict%04d.bmp",filecount++); +ZE"pA^C  
 name=m_Path+name; y\iECdPU  
 BITMAPFILEHEADER bfh; u5U^}<}y}  
 bfh.bfReserved1=bfh.bfReserved2=0; d@Bd*iI<  
 bfh.bfType=((WORD)('M'<< 8)|'B'); \Z%_dT}  
 bfh.bfSize=54+size; }Sh@.3*  
 bfh.bfOffBits=54; }\N ~%?6D  
 CFile bf; {}" <  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ qIzv|Nte  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); eK3d_bF+  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 4T)`%Oo<}  
  bf.WriteHuge(lpData,size); +['1~5  
  bf.Close(); n^G[N-\3  
  nCount++; +W[{UC4b  
 } ^eRbp?H*T  
 GlobalFreePtr(lpData); t?weD{O  
 if(nCount==1) B=_5gZ4Y  
  m_Number.Format("%d picture captured.",nCount); M6]:^;p'  
 else \Z~@/OVc  
  m_Number.Format("%d pictures captured.",nCount); Pa|*Jcr  
  UpdateData(FALSE); 5?j#  
} Y3)*MqZlF  
Lq@uwiq!  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Iz#jR2:yn  
{ JGzEm>_ m  
 if(pMsg -> message == WM_KEYDOWN) T`I4_x  
 { brCL"g|}  
  if(pMsg -> wParam == VK_ESCAPE) cZ.p  
   return TRUE; @v /Ae_q!  
  if(pMsg -> wParam == VK_RETURN) 0Y~5|OXJ  
   return TRUE; 1Sns$t%b  
 } q8e]{sT'!  
 return CDialog::PreTranslateMessage(pMsg); [zrFW g6N  
} daQJ{Cd,w  
dt<P6pK-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &)!N5Veb  
{ `v/p4/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7Z}T!HFMr  
  SaveBmp(); %|2x7@&s  
  return FALSE; e<u~v0rDl  
} Fb{HiU9<!  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 1[RI 07g7*  
 CMenu pop; vBY?3p,0p  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); kk CoOTe&  
 CMenu*pMenu=pop.GetSubMenu(0); [-)BI|S:  
 pMenu->SetDefaultItem(ID_EXITICON); _w5c-\-PUM  
 CPoint pt; ;t.)A3 PL  
 GetCursorPos(&pt); XzBl }4s  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 56Lt "Z F  
 if(id==ID_EXITICON) a63Ud<_a7  
  DeleteIcon(); \:Hh'-77q  
 else if(id==ID_EXIT) 3Z}m5f`t  
  OnCancel(); mI;\ UOh'  
 return FALSE; NeewV=[%  
} (I1^nrDP.  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); H,!yG5yF  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) K1- 3!G  
 AddIcon(); sa"!ckh  
 return res; Ob|tA  
} xCu\jc)2  
~!Rf5QA85  
void CCaptureDlg::AddIcon() b|.<rV'BTt  
{ B-$ps=G+z  
 NOTIFYICONDATA data; /5f=a  
 data.cbSize=sizeof(NOTIFYICONDATA); cdL0<J b,  
 CString tip; |Yi_|']#  
 tip.LoadString(IDS_ICONTIP); &c= 3BEh  
 data.hIcon=GetIcon(0); 4%jQHOZ  
 data.hWnd=GetSafeHwnd(); cm>+f^4?n  
 strcpy(data.szTip,tip); >+[{m<Eq  
 data.uCallbackMessage=IDM_SHELL; ge{%B~x  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; S)^eHuXPI  
 data.uID=98; Gx%f&H~Z^  
 Shell_NotifyIcon(NIM_ADD,&data); ch/DBu  
 ShowWindow(SW_HIDE); O3p<7`K<4  
 bTray=TRUE; -}>H3hr  
} > mP([]  
AD'c#CT  
void CCaptureDlg::DeleteIcon() ,YrPwdaTB  
{ !3*%-8bp  
 NOTIFYICONDATA data; 2<_|1%C  
 data.cbSize=sizeof(NOTIFYICONDATA); X&%;(`  
 data.hWnd=GetSafeHwnd(); gYw=Z_z  
 data.uID=98; $h1pL>^J  
 Shell_NotifyIcon(NIM_DELETE,&data); Q6PMRG}/o  
 ShowWindow(SW_SHOW); )EsFy6K:  
 SetForegroundWindow(); 2$joM`j$  
 ShowWindow(SW_SHOWNORMAL); %cq8%RT  
 bTray=FALSE; zgSv -h+f  
} %/K;!'7  
C7MCMM|S  
void CCaptureDlg::OnChange() 4+N9Ylh  
{ B,{Q[  
 RegisterHotkey(); ,Mu"r!MK  
} 1KI5tf>>p  
K=J">^uW  
BOOL CCaptureDlg::RegisterHotkey() g+ cH  
{ `n%8y I%  
 UpdateData(); %Q5 |RL D  
 UCHAR mask=0; S\A9r!2  
 UCHAR key=0; $w! v  
 if(m_bControl) ']>/$[!  
  mask|=4; Y:5Gp8Vi  
 if(m_bAlt) n'<F'1SWv  
  mask|=2; k{+ Gv}Y  
 if(m_bShift) ;#dzw!+Y  
  mask|=1; /h K/t;  
  key=Key_Table[m_Key.GetCurSel()]; 2P VQSwW:  
 if(bRegistered){ od]1:8OF  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); WeS$$:ro  
  bRegistered=FALSE; zWq&HBs  
 } ]=sGLd^)E  
 cMask=mask; Wg=4`&F^  
 cKey=key; '<hg c  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); axiP~t2  
 return bRegistered; .OvH<%g!.  
} kBJx`tjtp  
s!j vBy  
  四、小结 Xwk_QFv3  
Hu7WU;w  
  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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