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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-U:H.Vp  
  T_fM\jdI  
  一、实现方法 +.QJZo_  
_[/#t|I}  
  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: !gJw?(8"  
<4582x,G  
#pragma data_seg("shareddata") m%s:4Z%=  
HHOOK hHook =NULL; //钩子句柄 0xfF  
UINT nHookCount =0; //挂接的程序数目 7\yh<?`V8  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 k +Cwnp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ]#vi/6\J  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey sEi9<$~R@0  
static int KeyCount =0; Yw_!40`  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ZWQ/BgKB  
#pragma data_seg() Hz>Dp !  
l_Zx'm  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ^ U~QQ  
8k;il54#  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: #gXxBM  
T@a|*.V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR R$;TX^r'o&  
cKey,UCHAR cMask) i:1 @ vo  
{ zpZfsn!  
 BOOL bAdded=FALSE; \}_,g  
 for(int index=0;index<MAX_KEY;index++){ J|`.d46  
  if(hCallWnd[index]==0){ w8a49Fv  
   hCallWnd[index]=hWnd; \J;_%-Z  
   HotKey[index]=cKey; ;RYIc0%  
   HotKeyMask[index]=cMask; DKF '*  
   bAdded=TRUE; IL`=r6\  
   KeyCount++; 6w[EJ;=p_  
   break; wOsg,p;\'  
  } W:K '2j  
 } PlCj<b1D:  
 return bAdded; gyuBmY  
} jwP5pu  
//删除热键 3cF8DNh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w/*m_O\!  
{ 5GGO:  
 BOOL bRemoved=FALSE; nkf7Fq}  
 for(int index=0;index<MAX_KEY;index++){ 2+ywl}9  
  if(hCallWnd[index]==hWnd){ ?hViOh$.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [v`kqL~  
    hCallWnd[index]=NULL; :aH5=@[!y  
    HotKey[index]=0; gFsqCx<q  
    HotKeyMask[index]=0; 8e1Z:axn0  
    bRemoved=TRUE; x_r*<?OZ  
    KeyCount--; hw(\3h()  
    break; lnRL^ }  
   } -!}3bl*(7  
  } Fu 5c_"!  
 } ,e$6%R  
 return bRemoved; l>KkAA  
} lc3Gu78 A/  
$tej~xZK  
%r8;i  
  DLL中的钩子函数如下: r-.>3J  
YrV@k*O*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  :>U+HQll  
{ E;[Uhh|78!  
 BOOL bProcessed=FALSE; GP^.h kVs  
 if(HC_ACTION==nCode) I&31jn_o /  
 { # 1dg%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;#:AM;  
   switch(wParam) -& =dl_m  
   {  X0REC%  
    case VK_MENU: 3#Bb4\_v  
     MaskBits&=~ALTBIT; -:E~Z_J`  
     break; vrcIwCa  
    case VK_CONTROL: *"OUwEl a  
     MaskBits&=~CTRLBIT; 5DVYHN9c|  
     break; V@[C=K  
    case VK_SHIFT: {Wu[e,p  
     MaskBits&=~SHIFTBIT; ]qxl^Himq  
     break; Dp!91NgB p  
    default: //judge the key and send message 2t PfIg  
     break; {Ay dt8  
   } "%p7ft  
   for(int index=0;index<MAX_KEY;index++){ T^(> 8/O  
    if(hCallWnd[index]==NULL) e[s}tjx  
     continue; P-3f51Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) } !y5hv!_  
    { |Wjpnz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cnI5 G!  
     bProcessed=TRUE; Wky9w r:g  
    } -$DfnAh  
   } 2`TV(U@  
  } c+ e~BN  
  else if((lParam&0xc000ffff)==1){ //有键按下 Ka_;~LS>(  
   switch(wParam) Fk^N7EJ:$  
   { /KNDo^P  
    case VK_MENU: ;S '?l0  
     MaskBits|=ALTBIT; om2N*W.gk  
     break; dvU{U@:sz  
    case VK_CONTROL: bzxf*b1I  
     MaskBits|=CTRLBIT; 1m#.f=u{R  
     break; P%gA` j  
    case VK_SHIFT: ^'a#FbMtt  
     MaskBits|=SHIFTBIT; CS~_>bn  
     break; ~$J(it-a  
    default: //judge the key and send message ts9wSx~[+  
     break; a[ayr$Hk?  
   } Ikw@B)0}  
   for(int index=0;index<MAX_KEY;index++){ t%%()!|)j  
    if(hCallWnd[index]==NULL) S_/S2(V"  
     continue; 7eAV2.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) se`Eez}  
    { sRA2O/yKCE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); U3Z=X TB  
     bProcessed=TRUE; N9-7YQ`D  
    } m|F1_Ggz  
   } G}9f/$'3  
  } c!/ +0[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 %1.F;-GdsW  
   for(int index=0;index<MAX_KEY;index++){ /s} "0/Y\  
    if(hCallWnd[index]==NULL) f&mi nBU  
     continue; 1P*hC<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kDMvTVd  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S#?2E8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 XUA@f*  
   } 7HBf^N.  
  } zh*D2/ r  
 } FK593z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5a$EXV  
} [`t ;or  
V`1{*PrI@L  
  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: U/^#nU.,  
7XK0vKmW3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8hD[z}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Cj<8r S4+  
tP7<WGHd/  
  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: t15{>>f4>  
4P k%+l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) XFvl  
{ t`+A;%=K]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6UuN-7z!"  
 { t4[q :[1  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 HyVV,q^E  
  SaveBmp(); ]JYE#F  
  return FALSE; ,>h"~X  
 } BZ1wE1t  
 …… //其它处理及默认处理 Y~8 5Z0l  
} nOvR, 6  
_ERtL5^  
T+ZA"i+  
  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。 $3G^}A"  
O573AA  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。  3Iv^  
KF_fz   
  二、编程步骤 Y?NL|cW4  
9hfg/3t('  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; =g9n =spAn  
W Su6chz)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5@m ,*n&[  
]690ey$E:j  
  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; jez0 A  
H.ksI;,  
  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; ,3Q~X$f  
w;`Jj -  
  5、 添加代码,编译运行程序。 6dR+qJa6i  
>5Yn`Fc5  
三、程序代码 k`8O/J  
t4_yp_  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL <@KIDZYC  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <&l$xn  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~ p? ArZb  
#if _MSC_VER > 1000 XNWtX-[ ^@  
#pragma once gZ$ 8Y7  
#endif // _MSC_VER > 1000 ~3?-l/$  
#ifndef __AFXWIN_H__ 5 ix*wu`,  
#error include 'stdafx.h' before including this file for PCH !q\=e@j-i  
#endif f?Zjd&|Ch  
#include "resource.h" // main symbols p{^:b6  
class CHookApp : public CWinApp .i RKuBM/  
{ +ig%_QED[\  
 public: $qQYxx@  
  CHookApp(); ]O"f%   
  // Overrides 'NhQBk  
  // ClassWizard generated virtual function overrides E=ijt3  
  //{{AFX_VIRTUAL(CHookApp) | 6JKB'  
 public: 6+IhI?lI=  
  virtual BOOL InitInstance(); _w4G|j$C  
  virtual int ExitInstance(); P);s0Y|@H  
  //}}AFX_VIRTUAL ?f"5yQ-B  
  //{{AFX_MSG(CHookApp) i *.Y  
  // NOTE - the ClassWizard will add and remove member functions here. >,{s Fc  
  // DO NOT EDIT what you see in these blocks of generated code ! g2|Myz)  
  //}}AFX_MSG <J&S[`U!  
  DECLARE_MESSAGE_MAP() 5p[}<I{  
}; QPDh!A3T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "kyCY9) %  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wS*r<zj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #XDgvX >  
BOOL InitHotkey(); q>2bkcGY#  
BOOL UnInit(); Z)`)9]*  
#endif o{sv<$  
noxJr/A]  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. eut2x7Z(c  
#include "stdafx.h" o:AfEoH"~  
#include "hook.h" %;k Hnl  
#include <windowsx.h> VO|ECB2e  
#ifdef _DEBUG w+ R/>a( ]  
#define new DEBUG_NEW qg oB}n%  
#undef THIS_FILE ~V8z%s@  
static char THIS_FILE[] = __FILE__; u[b |QR=5  
#endif sE% $]Jp  
#define MAX_KEY 100 H`CID*Ji  
#define CTRLBIT 0x04 V%oZT>T3  
#define ALTBIT 0x02 (SBhU:^h  
#define SHIFTBIT 0x01 90<g=B  
#pragma data_seg("shareddata") {-\U)&6#v  
HHOOK hHook =NULL; )RJEOl1  
UINT nHookCount =0; q*&R&K;q  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey t>\sP   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT a_>|Ny6{  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey =b%}x >>  
static int KeyCount =0; ^?VQ$o2  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift <=*f  
#pragma data_seg() *U[yeE].  
HINSTANCE hins; @Dh2@2`>  
void VerifyWindow(); '>"{yi-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) /sA&}kX}E  
//{{AFX_MSG_MAP(CHookApp) b5NVQ8Mq  
// NOTE - the ClassWizard will add and remove mapping macros here. 8F}drK9>F  
// DO NOT EDIT what you see in these blocks of generated code! 'I]XX==_  
//}}AFX_MSG_MAP )!"fUz$  
END_MESSAGE_MAP() +-!E% $  
m\`>N_4*9  
CHookApp::CHookApp() f jx`|MJ  
{ nqyD>>  
 // TODO: add construction code here, ,dIev<  
 // Place all significant initialization in InitInstance xqG<R5k>>  
} bE_8NA"2  
j]BRfA  
CHookApp theApp; 8>v_th  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7Z6=e6/\  
{ ,|]J aZq  
 BOOL bProcessed=FALSE; nq M7Is  
 if(HC_ACTION==nCode) p~$cwbQ!  
 { u.GnXuax  
  if((lParam&0xc0000000)==0xc0000000){// Key up 1r;zA<<%R  
   switch(wParam) ?_NKyiu95  
   { "hsT^sy  
    case VK_MENU: bF"l0 jS  
     MaskBits&=~ALTBIT; ``-N2U5  
     break; v-1}&K  
    case VK_CONTROL: R=z])  
     MaskBits&=~CTRLBIT; 9d drtJ]  
     break; XnyN*}8  
    case VK_SHIFT: QKG3>lU  
     MaskBits&=~SHIFTBIT; ')"+ a^c  
     break; CvoFt=c$jE  
    default: //judge the key and send message &W2*'$j"_  
     break; 3z8i0  
   } IO\4dU)  
   for(int index=0;index<MAX_KEY;index++){ o:Fq|?/e  
    if(hCallWnd[index]==NULL) FnO@\{M"A  
     continue; UkL1h7}a\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f<YYo  
    { Q\$3l'W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %2\Hj0JQQ  
     bProcessed=TRUE; <3;p>4gN  
    } #a8kA"X  
   } .IeO+RDQ  
  } cM#rus?)+  
  else if((lParam&0xc000ffff)==1){ //Key down 2e`}O  
   switch(wParam) IVR%H_uz  
   { 23}` e  
    case VK_MENU: 9kL,69d2  
     MaskBits|=ALTBIT; bv+u7B6,  
     break; k#].nQG  
    case VK_CONTROL: QZzamT)"  
     MaskBits|=CTRLBIT; [l23b{  
     break; q(KjhM  
    case VK_SHIFT: 0fsVbC  
     MaskBits|=SHIFTBIT;  - vvyG  
     break; @-$8)?`q  
    default: //judge the key and send message #<*Vc6pC  
     break; AC,RS 7  
   } $^]K611w9  
   for(int index=0;index<MAX_KEY;index++) =Hi@q "  
   { GcBqe=/B!  
    if(hCallWnd[index]==NULL) Yuv i{ 0  
     continue;  ;l$$!PJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GK@OdurAR  
    { Su#0 F0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); !}&|a~U@`k  
     bProcessed=TRUE; %* "+kw Z  
    } > i/jqT/  
   } q/i2o[f'n  
  } b($hp%+yJ  
  if(!bProcessed){ -#v~;Ci  
   for(int index=0;index<MAX_KEY;index++){ V b0T)C  
    if(hCallWnd[index]==NULL) zxyl+tU &  
     continue; :`bC3Mr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) XM$ ~HG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); gmGK3am  
   } x?h/e;  
  } ]VI^ hhf  
 } ATs_d_Sz  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K`4lL5oH  
} lTx_E#^s  
^m>4<~/  
BOOL InitHotkey() ^6s im2  
{ {EgSjxfmw  
 if(hHook!=NULL){ U+S=MP }:  
  nHookCount++; cAWn*%  
  return TRUE; =xI;D,@S  
 } (@?mm  
 else Rlq7.2cP  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); oTw!#Re)  
  if(hHook!=NULL) F? #3  
   nHookCount++; DHO]RRGV  
  return (hHook!=NULL); mQ[$U  
} <FT7QO$I  
BOOL UnInit() ,B <\a  
{ (5yM%H8:  
 if(nHookCount>1){ :/5m D  
  nHookCount--; ;+Jx,{ )  
  return TRUE;  ? wS}'  
 } GP} ;~  
 BOOL unhooked = UnhookWindowsHookEx(hHook); c./\sN@  
 if(unhooked==TRUE){ )x.%PUA  
  nHookCount=0; iU)I"#\l'k  
  hHook=NULL; t~Q 9} +  
 } r.C6` a  
 return unhooked; +3v)@18B1  
} Rh=" <'d  
e5L+NPeM6v  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NRRJlY S  
{ _7c3=f83  
 BOOL bAdded=FALSE; '.A!IGsj  
 for(int index=0;index<MAX_KEY;index++){ 8`4M4" lj  
  if(hCallWnd[index]==0){ PxkV[ nbS  
   hCallWnd[index]=hWnd; JF=R$!5  
   HotKey[index]=cKey; [|]J8o@u^  
   HotKeyMask[index]=cMask; {[y6qQm  
   bAdded=TRUE; $WA wMS,  
   KeyCount++; IiYL2JS;t|  
   break; xR+vu>f  
  } N`8K1{>BH  
 } ]2AOW}=  
 return bAdded; @Z5q2Q  
} k/K)nH@)  
s QDgNJbU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'HA{6v,y  
{ #6 M] tr  
 BOOL bRemoved=FALSE; 5y#,z`S  
 for(int index=0;index<MAX_KEY;index++){ 8v$q+Wic  
  if(hCallWnd[index]==hWnd){ E0Wc8m"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ T.bFB+'E|  
    hCallWnd[index]=NULL; J Enjc/  
    HotKey[index]=0; %cF`x_h[j  
    HotKeyMask[index]=0; .D*Qu}  
    bRemoved=TRUE; P\U<,f  
    KeyCount--; qt8Y3:=8l  
    break; *!5CL'  
   } MAa9JA8kw)  
  } u~uzKG  
 } DB vM.'b$  
 return bRemoved; Q):#6|u+  
} |x}TpM;ni  
1XGg0SC  
void VerifyWindow() Cfi{%,em  
{ Jh"[ug  
 for(int i=0;i<MAX_KEY;i++){ oo'9ZE/%  
  if(hCallWnd!=NULL){ = 0 ~4k#  
   if(!IsWindow(hCallWnd)){ )nN!% |J  
    hCallWnd=NULL; GS;GJsAs  
    HotKey=0; 1/dL-"*0  
    HotKeyMask=0; ^y5A\nz&  
    KeyCount--; [$y(>] ~.  
   } L%/RD2L D  
  } L8 P0bNi  
 } LuS@Kf8N+  
} bZowc {!\  
H<Sn p)  
BOOL CHookApp::InitInstance() SmXoNiM"y  
{ F`D$bE;|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); h:Pfiw]  
 hins=AfxGetInstanceHandle(); N/ a4Gl(  
 InitHotkey(); *C*J1JYp+  
 return CWinApp::InitInstance(); DB}Uzw|  
} 6-U_TV  
} z'Jsy[s  
int CHookApp::ExitInstance() De$~ *2  
{ bT:u |/I  
 VerifyWindow(); z{XB_j6\=  
 UnInit(); >X~B1D,SV7  
 return CWinApp::ExitInstance(); *yZ6"  
} Ww<Y]H$xZ<  
Ah2@sp,z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `YOYC  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_)  5%-{r&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ }7.A~h  
#if _MSC_VER > 1000 `d <`>  
#pragma once Q{/z>-X\x  
#endif // _MSC_VER > 1000 t=%zY~P  
j0l{Mc5  
class CCaptureDlg : public CDialog J 6 ~Sr  
{ tU4#7b:Y  
 // Construction aCZ0-X?c  
 public: "P! .5B  
  BOOL bTray; ,%pCcM)  
  BOOL bRegistered; [@i:qB>B  
  BOOL RegisterHotkey(); >.<VD7p  
  UCHAR cKey; 6[m~xegG  
  UCHAR cMask; H/a gt  
  void DeleteIcon(); eMGJx"a  
  void AddIcon(); C HnclT  
  UINT nCount; K V5 '-Sv1  
  void SaveBmp(); W8W7<ml0A  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor >a"J);p  
  // Dialog Data ()lgd7|+  
  //{{AFX_DATA(CCaptureDlg) XIcUoKg^  
  enum { IDD = IDD_CAPTURE_DIALOG }; ^".OMS"!  
  CComboBox m_Key; m?S;s ew@5  
  BOOL m_bControl; '#Wx@  
  BOOL m_bAlt; V]zZb-m=  
  BOOL m_bShift; XYU5.  
  CString m_Path; OZ`cE5"i  
  CString m_Number; E%w^q9C  
  //}}AFX_DATA k_pv6YrE  
  // ClassWizard generated virtual function overrides poz_=,c  
  //{{AFX_VIRTUAL(CCaptureDlg) <H-Nft>O  
 public: kpgvAKyx  
  virtual BOOL PreTranslateMessage(MSG* pMsg); _S9)<RVI+  
 protected: 3lF"nv  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (cj9xROx  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6Zi{gx  
  //}}AFX_VIRTUAL I%d=c0>%  
  // Implementation -y.cy'$f  
 protected: >LBA0ynh {  
  HICON m_hIcon; e-dkvPr  
  // Generated message map functions S,5ok0R  
  //{{AFX_MSG(CCaptureDlg) t$BjJ -G  
  virtual BOOL OnInitDialog(); x?AG*' h&  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); yY VR]HH  
  afx_msg void OnPaint(); p]aEC+q  
  afx_msg HCURSOR OnQueryDragIcon(); .fWy\ r0  
  virtual void OnCancel(); f:-)S8OJ  
  afx_msg void OnAbout(); sH6;__e  
  afx_msg void OnBrowse(); (.-4Jn  
  afx_msg void OnChange(); -XYvjW,|  
 //}}AFX_MSG O84]J:b  
 DECLARE_MESSAGE_MAP() hQ#e;1uD  
}; l>6tEOXt  
#endif $>)0t@[f  
7. F'1oEf  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [CQR  
#include "stdafx.h" n>ryS/1  
#include "Capture.h" '/O:@P5qY  
#include "CaptureDlg.h" MCN>3/81  
#include <windowsx.h> ' ]k<' `b|  
#pragma comment(lib,"hook.lib") FJvY`zqB  
#ifdef _DEBUG HXq']+iC  
#define new DEBUG_NEW %+*=Vr  
#undef THIS_FILE VR (R.  
static char THIS_FILE[] = __FILE__; |4\1V=(  
#endif [t4v/vQT  
#define IDM_SHELL WM_USER+1 ny-:%A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t:10  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KZKE&bTx  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :T-DxP/  
class CAboutDlg : public CDialog +bumWOQ'  
{ g Wtc3  
 public: '| i?-(f)  
  CAboutDlg(); 0B.Gt&O al  
  // Dialog Data uj.i(U s  
  //{{AFX_DATA(CAboutDlg) FL{Uz+Q  
  enum { IDD = IDD_ABOUTBOX }; /A{ Zf'DI  
  //}}AFX_DATA ]N'3jf`W  
  // ClassWizard generated virtual function overrides UhH#> 2r_  
  //{{AFX_VIRTUAL(CAboutDlg) {/QVs?d  
 protected: %IsodtkDu  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D:T]$<=9  
  //}}AFX_VIRTUAL i{^T;uAE  
  // Implementation wOAR NrPx2  
 protected: o/N!l]r  
  //{{AFX_MSG(CAboutDlg) H )ej]DXy  
  //}}AFX_MSG ACyK#5E  
  DECLARE_MESSAGE_MAP() Mj@2=c  
}; j[U#J  
&g|[/~dIr  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -[=~!Qr:  
{ $a_y-lY  
 //{{AFX_DATA_INIT(CAboutDlg) 3;>ls~4  
 //}}AFX_DATA_INIT d]DV\*v  
} |5 V0_79  
y[m,t}gi  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ` aVp#  
{ d{YvdN9d  
 CDialog::DoDataExchange(pDX); A.>mk598  
 //{{AFX_DATA_MAP(CAboutDlg) 'rB% a<  
 //}}AFX_DATA_MAP ]oP1c-GEk  
} !|[rh,e]  
;1(^H:7T  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) GD4S/fn3  
 //{{AFX_MSG_MAP(CAboutDlg) NW1Jr/  
 // No message handlers #RlZxtx.O  
 //}}AFX_MSG_MAP Q ^b&   
END_MESSAGE_MAP() T.da!!'B f  
wv9HiHz8gD  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !v}TRGX  
: CDialog(CCaptureDlg::IDD, pParent) 8^>qor.]M  
{ aqON6|6K  
 //{{AFX_DATA_INIT(CCaptureDlg) ) H,Xkex  
  m_bControl = FALSE; = wz}yfdrC  
  m_bAlt = FALSE; }zGx0Q  
  m_bShift = FALSE; |.k'?!  
  m_Path = _T("c:\\"); g*YDgY  
  m_Number = _T("0 picture captured."); J5{;+ysUMl  
  nCount=0; ?c#s}IH  
  bRegistered=FALSE; -Q20af-  
  bTray=FALSE; 1'&.6{)P  
 //}}AFX_DATA_INIT Z|t=t"6"  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 JI>Y?1i0O  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $cSUB  
} }a;xs};X;  
R1zt6oY  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #Y=^4U`  
{ gH//@`6  
 CDialog::DoDataExchange(pDX); neFwxS?  
 //{{AFX_DATA_MAP(CCaptureDlg) oxxuw Dcl  
  DDX_Control(pDX, IDC_KEY, m_Key); bv4umL /  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ^L%_kL_7  
  DDX_Check(pDX, IDC_ALT, m_bAlt); t\,Y<9{w  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); pwFdfp  
  DDX_Text(pDX, IDC_PATH, m_Path); c {= ; lT  
  DDX_Text(pDX, IDC_NUMBER, m_Number); -`faXFW'  
 //}}AFX_DATA_MAP 9L>?N:%5  
} mi=mwN%UB  
NzT &K7v  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9tHK_),9  
//{{AFX_MSG_MAP(CCaptureDlg) ^`cv6;)  
 ON_WM_SYSCOMMAND() EJn]C=_(  
 ON_WM_PAINT() AQ)gj$ m3  
 ON_WM_QUERYDRAGICON() 6=f)3!=  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) =+iY<~8  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) qPPe)IM'Sc  
 ON_BN_CLICKED(ID_CHANGE, OnChange) d6MWgg  
//}}AFX_MSG_MAP q;68tEupR  
END_MESSAGE_MAP() B<d=;V  
%5e|  
BOOL CCaptureDlg::OnInitDialog() Bt<)1_  
{ VlV X  
 CDialog::OnInitDialog(); JVoC2Z<  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); M+%Xq0`T  
 ASSERT(IDM_ABOUTBOX < 0xF000); d]0:r]e  
 CMenu* pSysMenu = GetSystemMenu(FALSE); &qbEF3p^@  
 if (pSysMenu != NULL) _*AI1/>`  
 { *'?ZG/ (  
  CString strAboutMenu; 'J?{/O^  
  strAboutMenu.LoadString(IDS_ABOUTBOX); =F@ +~)_  
  if (!strAboutMenu.IsEmpty()) >` s"C  
  { pB:XNkxL  
   pSysMenu->AppendMenu(MF_SEPARATOR); "WKOlfPa  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v]cw})l  
  } j- 9)Sijj{  
 } 9:2Bt <q  
 SetIcon(m_hIcon, TRUE); // Set big icon K+~?yOQj  
 SetIcon(m_hIcon, FALSE); // Set small icon H q6%$!q  
 m_Key.SetCurSel(0); v-#,@&Uwq  
 RegisterHotkey(); /bykIUTKI  
 CMenu* pMenu=GetSystemMenu(FALSE); `"=Hk@E  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); X(tx8~z  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 0BXr[%{`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Z#}sK5s  
 return TRUE; // return TRUE unless you set the focus to a control |Z>-<]p9g  
} li[[AAWVm  
y hKH} kR  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .'`aX 7{\  
{ _WNbuk0  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) fd4gB6>  
 { {H/%2  
  CAboutDlg dlgAbout; ~Z5AImR|  
  dlgAbout.DoModal(); i@9 qp?eb  
 } K^!#;,0  
 else O[ z0+Q?6Z  
 { bkdXBCBx?  
  CDialog::OnSysCommand(nID, lParam); ~B[e*| d  
 } <Z.`X7]Uk  
} Sqi9'-%m  
p l^;'|=M  
void CCaptureDlg::OnPaint() n>)aw4  
{ lZAGoR;0Ra  
 if (IsIconic()) r]Hrz'C`  
 { [.>=> KJ_  
  CPaintDC dc(this); // device context for painting 80Y% C-Y:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); - G>J  
  // Center icon in client rectangle hwM<0Jf   
  int cxIcon = GetSystemMetrics(SM_CXICON); 3PkZXeH/  
  int cyIcon = GetSystemMetrics(SM_CYICON); rd&d~R6  
  CRect rect; b#@xg L*D  
  GetClientRect(&rect); bYLYJ`hH<R  
  int x = (rect.Width() - cxIcon + 1) / 2; v9H t~\>  
  int y = (rect.Height() - cyIcon + 1) / 2; Hx6O Dj[-  
  // Draw the icon I'IFBVhaYn  
  dc.DrawIcon(x, y, m_hIcon); O^\:J 2I(  
 } J,,V KA&  
 else FV9{u[3m  
 { Mo@{1K/9  
  CDialog::OnPaint(); T%.Y so{  
 } SOG(&)b  
} egsP\ '  
1$DcE>  
HCURSOR CCaptureDlg::OnQueryDragIcon() 8/p ]'BLf  
{ >&HW6 c  
 return (HCURSOR) m_hIcon; l'm|**  
} `=;}I@]zj)  
f~l pa7  
void CCaptureDlg::OnCancel() xpp nBnu$7  
{ Z?S?O#FED  
 if(bTray) %H?B5y  
  DeleteIcon(); ~I N g9|  
  CDialog::OnCancel(); ;m] nl_vg  
} Wj3i*x$  
*b~8`O pa`  
void CCaptureDlg::OnAbout() M5RN Z%  
{ *# <%04f  
 CAboutDlg dlg; m^BXLG:b  
 dlg.DoModal(); w)J-e gc  
} R-$w* =Y  
B{0]v-w  
void CCaptureDlg::OnBrowse() P_jav 0j7g  
{ s8A"x`5(  
 CString str; \aPH_sf,  
 BROWSEINFO bi; WyV,(~y  
 char name[MAX_PATH]; X)(K|[  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); y)L X?d  
 bi.hwndOwner=GetSafeHwnd(); 3W ]zLUn  
 bi.pszDisplayName=name; uN?Lz1W\;  
 bi.lpszTitle="Select folder"; @rqmDpU  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; #Qg)4[pMJ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); U5ph4G  
 if(idl==NULL) VQf^yq  
  return; C:&Sk\   
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); q%k&O9C2]  
 str.ReleaseBuffer(); <x$nw'H9  
 m_Path=str; XU<owk  
 if(str.GetAt(str.GetLength()-1)!='\\') h('5x,G%  
  m_Path+="\\"; !m=Js"  
 UpdateData(FALSE); GYy8kp84  
} 3,Z;J5VL4!  
)y:M8((%  
void CCaptureDlg::SaveBmp() C3.]dsv:  
{ :xmj42w>^  
 CDC dc; oGZuYpa9  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); > mCH!ey  
 CBitmap bm; '%_K"rb  
 int Width=GetSystemMetrics(SM_CXSCREEN); `"'u mIz  
 int Height=GetSystemMetrics(SM_CYSCREEN); QgH{J8 0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); vp&.  
 CDC tdc; 5KbPpKpd  
 tdc.CreateCompatibleDC(&dc); i \Yd_  
 CBitmap*pOld=tdc.SelectObject(&bm); %q r,Ssa/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5mVO9Q j  
 tdc.SelectObject(pOld); jB9~'>JY  
 BITMAP btm; r 25VcY  
 bm.GetBitmap(&btm); l' Li!u  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Tw%1m  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); N DI4EA~z  
 BITMAPINFOHEADER bih; ,d!@5d&Zi  
 bih.biBitCount=btm.bmBitsPixel; #v$wjqK5  
 bih.biClrImportant=0; ORqqzy +  
 bih.biClrUsed=0; <  j  
 bih.biCompression=0; v 9G~i  
 bih.biHeight=btm.bmHeight; *E>R1bJ8  
 bih.biPlanes=1; JSq3)o9?/  
 bih.biSize=sizeof(BITMAPINFOHEADER);  EAr;  
 bih.biSizeImage=size; .`u8(S+  
 bih.biWidth=btm.bmWidth; sm?b,T/  
 bih.biXPelsPerMeter=0; ' 8R5 Tl  
 bih.biYPelsPerMeter=0; &&jQ4@m}j  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9%R"(X)  
 static int filecount=0; KDf#e3  
 CString name; 2u0B=0x  
 name.Format("pict%04d.bmp",filecount++); ',|OoxhbK  
 name=m_Path+name; u46Z}~xfb  
 BITMAPFILEHEADER bfh; xz} CqPJ#  
 bfh.bfReserved1=bfh.bfReserved2=0; m'G=WO*%  
 bfh.bfType=((WORD)('M'<< 8)|'B'); )_Hv9!U]e  
 bfh.bfSize=54+size; d@8: f  
 bfh.bfOffBits=54; R:'&>.AUw  
 CFile bf; xHx_! )7  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ wmMn1q0F  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2cS94h  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,T ^A?t  
  bf.WriteHuge(lpData,size); yI!W658$6  
  bf.Close(); z 36Y/{>[  
  nCount++; p_zVrlVb  
 } iB~dO @  
 GlobalFreePtr(lpData); Zu~t )W  
 if(nCount==1) (Xz q(QV  
  m_Number.Format("%d picture captured.",nCount); Q?>*h xzoP  
 else P uQ  
  m_Number.Format("%d pictures captured.",nCount); -IDhK}C&T  
  UpdateData(FALSE); K0@bh/i/^  
} A;^{%S  
 YO fYa  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &P*r66  
{ juu"V]Q 1  
 if(pMsg -> message == WM_KEYDOWN) 1x sJz^%V  
 { fI.X5c>WK  
  if(pMsg -> wParam == VK_ESCAPE) PVN`k, 4  
   return TRUE; 3+ C;zDKa  
  if(pMsg -> wParam == VK_RETURN) Mx 3fT>?  
   return TRUE; W=#jtU`:5  
 } 'Vhnio;qC  
 return CDialog::PreTranslateMessage(pMsg); Xp6Z<Z&N  
} b ts*qx&)  
hsK(09:J  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D-m%eP.  
{ 6@d/k.3p  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >Fe=PRs  
  SaveBmp(); dJb7d`  
  return FALSE; ,[_)BM  
} daf-B-  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 6hFs{P7  
 CMenu pop; OaByfo<S  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,yfJjV*I  
 CMenu*pMenu=pop.GetSubMenu(0); xKT;1(Mk  
 pMenu->SetDefaultItem(ID_EXITICON); #TgP:t]p  
 CPoint pt; G+3uY25y  
 GetCursorPos(&pt); COH.`Tv{*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y7z ,I  
 if(id==ID_EXITICON) 0 zjGL7  
  DeleteIcon(); V%^d~^m,H  
 else if(id==ID_EXIT) ])zpx-  
  OnCancel(); 4LJOT_  
 return FALSE; C+C1(b;1  
} ?J"Y4,{  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); v1NFz>Hx  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (<|1/^~=  
 AddIcon(); En8L1$_  
 return res; hg `N`O  
} c,*a|@  
{Q0DHNP(G  
void CCaptureDlg::AddIcon() J=#9eW  
{ ;s-fYS6(>{  
 NOTIFYICONDATA data; <@v|~ AO4~  
 data.cbSize=sizeof(NOTIFYICONDATA); oIKuo~  
 CString tip; ]mi)x6 3^  
 tip.LoadString(IDS_ICONTIP); M !rw!,g  
 data.hIcon=GetIcon(0); A+hT2Ew@t}  
 data.hWnd=GetSafeHwnd(); fp"GdkO#}i  
 strcpy(data.szTip,tip); `u8=~]rblj  
 data.uCallbackMessage=IDM_SHELL; b$B-LvHd1  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^Ov+n1,)  
 data.uID=98; <)gTi759h)  
 Shell_NotifyIcon(NIM_ADD,&data); e/IVZmUn^  
 ShowWindow(SW_HIDE); Uetna!ABB  
 bTray=TRUE; 9sB LCZ  
} R)GDsgXy  
`$r?^|T  
void CCaptureDlg::DeleteIcon() M3q7{w*bM  
{ v/G^yZa  
 NOTIFYICONDATA data; `Jl_'P}  
 data.cbSize=sizeof(NOTIFYICONDATA); YZ5[# E@l  
 data.hWnd=GetSafeHwnd(); I8:G:s:  
 data.uID=98; 3T@`V FbE  
 Shell_NotifyIcon(NIM_DELETE,&data); 2!Pwg0%2  
 ShowWindow(SW_SHOW); rK cr1VFy  
 SetForegroundWindow(); /_/Z/D!  
 ShowWindow(SW_SHOWNORMAL); ']vMOGG  
 bTray=FALSE; _dn*H-5hO  
} -k@Uo(MB  
z~yLc{M  
void CCaptureDlg::OnChange() r Ww.(l  
{ %A;s 3 ]V  
 RegisterHotkey(); ltmD=-]G_  
} 9B1bq#  
?} U l(  
BOOL CCaptureDlg::RegisterHotkey() .+CMm5T  
{ ( z%t  
 UpdateData();  7e@Bkq0)  
 UCHAR mask=0; 6)#%36rP  
 UCHAR key=0; v!rOT/I  
 if(m_bControl) PAy7b7m~B  
  mask|=4; (:J U  
 if(m_bAlt) G)y'exk  
  mask|=2; 4 !M6 RL8{  
 if(m_bShift) F}_Zh9/$(  
  mask|=1; 8HH\wu$$e  
  key=Key_Table[m_Key.GetCurSel()]; _jrkR n1"  
 if(bRegistered){ I6F $@  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Gjf1Ba  
  bRegistered=FALSE; %{";RfSVX%  
 } Y t0s  
 cMask=mask; ;i;;{j@$i  
 cKey=key; |#(g 8ua7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); L~L]MC&  
 return bRegistered; M% FKg/  
} m}fY5r<<;/  
F5f1j]c  
  四、小结 AV["%$ :  
7:h_U9Za?$  
  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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