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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: \~5|~|9<  
  !&VfOx:PN  
  一、实现方法 8?+|4:#=*J  
]Btkoad  
  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: *HKw;I   
3 ~v 17  
#pragma data_seg("shareddata") A0DGDr PD  
HHOOK hHook =NULL; //钩子句柄 /\8I l+0  
UINT nHookCount =0; //挂接的程序数目 5BhR4+1J  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 P"w\hF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 (9'^T.J  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 7{|QkTgC  
static int KeyCount =0; Tz]R}DKB&  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -* ,CMw  
#pragma data_seg() $O%{l.-O  
@[n#-!i  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 3$\k=q3`#  
W'[V$*  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: bx3Q$|M?  
X06Lr!-%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR e,U:H~+]  
cKey,UCHAR cMask) ShB]U5b:k  
{ .;?!I_`  
 BOOL bAdded=FALSE; ! xCo{U=  
 for(int index=0;index<MAX_KEY;index++){ z]G|)16  
  if(hCallWnd[index]==0){ (>v'0 RA  
   hCallWnd[index]=hWnd; )j_El ]?  
   HotKey[index]=cKey; c$g@3gL  
   HotKeyMask[index]=cMask; t2N W$ -E  
   bAdded=TRUE; ,>  zEG  
   KeyCount++; V_+&Y$msi~  
   break; II\&)_S.4  
  } >d/H4;8  
 } MYAt4cHc2  
 return bAdded; OR <+y~Rv  
} wX,V:QE  
//删除热键 YFO{i-*q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S&-K!XyJ  
{ oh9 ;_~  
 BOOL bRemoved=FALSE; B 71/nt9  
 for(int index=0;index<MAX_KEY;index++){ WK>F0xMs1  
  if(hCallWnd[index]==hWnd){ A lU^ ,X  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,;)ZF  
    hCallWnd[index]=NULL; -#|D>  
    HotKey[index]=0; NQ9v[gv  
    HotKeyMask[index]=0; k ka5=u  
    bRemoved=TRUE; H9cPtP~a)  
    KeyCount--; [^5\Ww  
    break; ks4`h>i  
   } V0nQmsP1U  
  } y?$DDD  
 } '0+*  
 return bRemoved; DP ? d C`  
} S#/%#k103  
pO` KtagL  
P49\A^5S!  
  DLL中的钩子函数如下: @+u>rS|IB  
* DL7p8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) OK [J h  
{ D|;O9iks#  
 BOOL bProcessed=FALSE; *%j$i_  
 if(HC_ACTION==nCode) -=ZL(r 1  
 { JB_fS/I  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /).{h'^Hq\  
   switch(wParam) )kD/ 8  
   {  CKsVs.:u  
    case VK_MENU: ]{>AU^=U  
     MaskBits&=~ALTBIT; 'YL[s  
     break; ~3&{`9Y  
    case VK_CONTROL: %ByPwu:f  
     MaskBits&=~CTRLBIT; ~4~`bT9  
     break; n>M`wF>  
    case VK_SHIFT: GtA`0B  
     MaskBits&=~SHIFTBIT; P?54"$b  
     break; c`a(  
    default: //judge the key and send message G.W !   
     break; 2QfN.<[-  
   } UiFH*HT  
   for(int index=0;index<MAX_KEY;index++){ V`V\/s gj  
    if(hCallWnd[index]==NULL) =&HLz 7|  
     continue; H];B?G';C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rd%%NnT"  
    { *IG$"nu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]\$/:f-2  
     bProcessed=TRUE; \/a6h   
    } r* *zjv>  
   } M([#Py9h  
  } (Fv tL*  
  else if((lParam&0xc000ffff)==1){ //有键按下 xs$$fPAQ  
   switch(wParam) yK~=6^M  
   { CD|[PkjW  
    case VK_MENU: }r:o8+4  
     MaskBits|=ALTBIT; zZ5:)YiW-  
     break; }lJ;|kx$  
    case VK_CONTROL: hp\&g2_S0W  
     MaskBits|=CTRLBIT; YG p+[|'  
     break; ._mep\#.:  
    case VK_SHIFT: }U_ ' 7_JT  
     MaskBits|=SHIFTBIT; qNp1<QO0  
     break; .HqFdsm  
    default: //judge the key and send message WjV15\,  
     break; dUI5,3*  
   } MmuT~d/  
   for(int index=0;index<MAX_KEY;index++){ ^J!q>KJs  
    if(hCallWnd[index]==NULL) uV/5f#)  
     continue; V~J5x >O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qWt}8_"  
    { 0#q=-M/?`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); }f}.>B0#  
     bProcessed=TRUE; x%{]'z  
    } B /? L$m  
   } Vz{+3vfra6  
  } ]Bw0Qq F#  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 sDY~jP[Oa  
   for(int index=0;index<MAX_KEY;index++){ :6^7l/p  
    if(hCallWnd[index]==NULL) sp9gz~Kq  
     continue; J=4>zQLW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) bz>X~   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cr7MvXF-  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 }pc9uvmIJ  
   } O] _4pP  
  } =OVDJ0ozZ  
 } 8)i""OD@I  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |{jT+  
} Jd2.j?P=  
']]d-~:  
  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: ~/ %Xm<  
s\ IKSoE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JzHG5nmB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SC{m@  
!3v&+Jrf6  
  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: 2ZH+fV?.  
+n3I\7G>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) s='+[*&&  
{ DL]tg [w{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) KWTV!Wxb=K  
 { eRauyL"Q+  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @NHh- &;w  
  SaveBmp(); {|;a?] ?  
  return FALSE; x-^6U  
 } zmMc*|  
 …… //其它处理及默认处理 /r}L_wI  
} wBPo{  
ITu19WG  
)8Va%{j  
  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。 9 _d2u#  
}x8!{Y#cF  
  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。 xo:kT)  
uOxHa>h  
  二、编程步骤 PT"}2sR)  
}Q7y tE  
  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"; ~5 ^Jv m  
H'+7z-% G  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; N^^0j,  
~z,o):q1 }  
  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; _n&Nw7d2 M  
8fR(y~_gF  
  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; w =^.ICyb@  
:Pud%}'  
  5、 添加代码,编译运行程序。 XtF m5\U  
| HazM9=  
三、程序代码 h}bfZL  
n*4`Tduu^  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ]rcF/uQJ<n  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) '\Xkvi  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ R>' %}|v/  
#if _MSC_VER > 1000 99m2aT()  
#pragma once ,d G.67  
#endif // _MSC_VER > 1000 QFh1sb)]d)  
#ifndef __AFXWIN_H__ O5\r%&$xd  
#error include 'stdafx.h' before including this file for PCH gN&i &%*!  
#endif 50UdY9E_v}  
#include "resource.h" // main symbols *Cy54Z#  
class CHookApp : public CWinApp +A9~h/"kt  
{ 6( HF)z  
 public: UD I{4+z  
  CHookApp(); n:j'0WW  
  // Overrides HL)!p8UHJ  
  // ClassWizard generated virtual function overrides DA=!AK>  
  //{{AFX_VIRTUAL(CHookApp) ,'#TdLe  
 public: 7y=>Wa?T[  
  virtual BOOL InitInstance(); 3"fDFR  
  virtual int ExitInstance();  Et>#&Nw8  
  //}}AFX_VIRTUAL =8^+M1I  
  //{{AFX_MSG(CHookApp) OLw]BJXYaE  
  // NOTE - the ClassWizard will add and remove member functions here. LiJYyp  
  // DO NOT EDIT what you see in these blocks of generated code ! 37AVk`a  
  //}}AFX_MSG 7]{g^g.9-  
  DECLARE_MESSAGE_MAP() 9+.wj/75  
}; D0. )%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); qY_qS=H^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); R!nf^*~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1/_g36\l$  
BOOL InitHotkey();  7WJ \nK  
BOOL UnInit(); )0{`}7X  
#endif A q i:h]x  
m 0HK1'  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~ELY$G.xl  
#include "stdafx.h" =w2 4(S  
#include "hook.h" XN<SKW(H3  
#include <windowsx.h> K+g[E<x\=  
#ifdef _DEBUG X -pbSq~5  
#define new DEBUG_NEW 8-$t7bV5  
#undef THIS_FILE ?W/.'_  
static char THIS_FILE[] = __FILE__; sJHVnMA  
#endif 4WT[(  
#define MAX_KEY 100 nF3}wCe)  
#define CTRLBIT 0x04 &|>@K#V8-;  
#define ALTBIT 0x02 +ikSa8)*i  
#define SHIFTBIT 0x01 9u=A:n\  
#pragma data_seg("shareddata") l.YE@EL  
HHOOK hHook =NULL; Y$'j9bUJ  
UINT nHookCount =0; CEy\1D  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey oOFTQB_6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT nep#L>LP$x  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ;\MWxh,K  
static int KeyCount =0; XqH@3Ehk  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ^W |YE72Y  
#pragma data_seg() 'Waa zk[@O  
HINSTANCE hins; K;K0D@>]HR  
void VerifyWindow(); M!&Hn,22  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) {UNH?2  
//{{AFX_MSG_MAP(CHookApp) MBLZ:A| C  
// NOTE - the ClassWizard will add and remove mapping macros here. 0cG'37[  
// DO NOT EDIT what you see in these blocks of generated code! bWPsfUn#  
//}}AFX_MSG_MAP Xfiwblg  
END_MESSAGE_MAP() ]HKt7 %,  
{q>%Sr]9  
CHookApp::CHookApp()  F/Goq`  
{ EOPx 4+o  
 // TODO: add construction code here, Y&2FH/(M  
 // Place all significant initialization in InitInstance V"Q\7,_k.  
} GT{4L]C  
+{UY9_~\3  
CHookApp theApp; q'D Ts9Bj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `[ZswLE  
{ U%3N=M  
 BOOL bProcessed=FALSE; A;AQw  
 if(HC_ACTION==nCode) i'Y8-})  
 { =NB[jQ :(  
  if((lParam&0xc0000000)==0xc0000000){// Key up U-|]A\`)I  
   switch(wParam) lyn%r  
   { +VwQ=[y]  
    case VK_MENU: y6(PG:L  
     MaskBits&=~ALTBIT; {!,K[QwcI  
     break; E@}F^0c  
    case VK_CONTROL: E'iE#He  
     MaskBits&=~CTRLBIT; 3(YvqPp&  
     break; Hv6h7-  
    case VK_SHIFT: osC?2.  
     MaskBits&=~SHIFTBIT; .7iRV  
     break; *ug~LK5Y.  
    default: //judge the key and send message g*k)ws  
     break; AXyXK??  
   } {16a P  
   for(int index=0;index<MAX_KEY;index++){ 'g#%>  
    if(hCallWnd[index]==NULL) )~2\4t4|g  
     continue; 2mLZ4 r>WE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y r (g/0  
    { ~nZcA^b#DQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g`fG84  
     bProcessed=TRUE; EJ:O 1  
    } G e;67  
   } bY_'B5$.^2  
  } C'R9Nn'  
  else if((lParam&0xc000ffff)==1){ //Key down N0 {e7M  
   switch(wParam) *'@O o  
   { *85N_+Wv!  
    case VK_MENU: z/t|'8f  
     MaskBits|=ALTBIT; 2|pTw5z~  
     break; -wU]L5uP  
    case VK_CONTROL: (/y8KG 3  
     MaskBits|=CTRLBIT; .Fb#j+Lq  
     break; 17hoX4T  
    case VK_SHIFT: ZTmy}@l  
     MaskBits|=SHIFTBIT; NcA `E_3  
     break; ljFq;!I5  
    default: //judge the key and send message 2z>-H595az  
     break; ;"dX]":  
   } zlMh^+rMX  
   for(int index=0;index<MAX_KEY;index++) .n:Q~GEL  
   { rPH7 ]]  
    if(hCallWnd[index]==NULL) %H{pU:[5*  
     continue; ]r`;89:s>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y2W+YV*  
    { 0E.N3iU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); H cmW  
     bProcessed=TRUE; `[H^ `   
    } :7e*- '  
   } #GM^:rF  
  } D e&,^"%  
  if(!bProcessed){ AVT % AS  
   for(int index=0;index<MAX_KEY;index++){ ^'QO!{7f  
    if(hCallWnd[index]==NULL) %.Y5%T yP  
     continue; 9f~qD&~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~J\qkQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); A6(Do]M  
   } ,gV#x7IW  
  } *aErwGLB8  
 } M9)4ihK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /@:X0}L  
} >n7h%c  
P2n8HFi  
BOOL InitHotkey() cSL6V2F  
{ *\ii +f-  
 if(hHook!=NULL){ !}Xoqamm  
  nHookCount++; Snr(<u  
  return TRUE; 0zW*JJxV  
 } |5u~L#P  
 else KL \>-  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); rLTBBvV  
  if(hHook!=NULL) \$9C1@B@  
   nHookCount++; =.`\V]  
  return (hHook!=NULL); 7@@g|l]  
} RV~t%Sw^  
BOOL UnInit() m6R/,  
{ ?/|Xie  
 if(nHookCount>1){ E/cV59  
  nHookCount--; @=kg K[t 9  
  return TRUE; ky2]%cw  
 } ~'M<S=W  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 21TR_0g&<  
 if(unhooked==TRUE){ u X,n[u  
  nHookCount=0; 4t*%(  
  hHook=NULL; O Z ./suR)  
 } E{ /, b)  
 return unhooked;  IuY9Q8  
} |WB-Ng  
/8; m.J>bf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /&Q{B f  
{ TcZ.5Oe6h#  
 BOOL bAdded=FALSE; >pu4G+M  
 for(int index=0;index<MAX_KEY;index++){ k4Q>J,k  
  if(hCallWnd[index]==0){ HV%/baX]  
   hCallWnd[index]=hWnd; O)jD2X?  
   HotKey[index]=cKey; 1 Uup.(  
   HotKeyMask[index]=cMask; `r$7Cc$C  
   bAdded=TRUE; ]i {yJ)i  
   KeyCount++; vW?\bH7}I  
   break; kZe<<iv  
  } |]-Zz7N)  
 } q>_<\|?%x  
 return bAdded; mZ71_4X#  
} *RkUF!)(  
}MaY:PMA  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) WW:G( \`  
{ ^ ]9K>}  
 BOOL bRemoved=FALSE; _}R9!R0O  
 for(int index=0;index<MAX_KEY;index++){ Vn5T Jw  
  if(hCallWnd[index]==hWnd){ bK:U:vpYm  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0?54 8yH  
    hCallWnd[index]=NULL; ?^VPO%  
    HotKey[index]=0; ZR1U&<0c@  
    HotKeyMask[index]=0; FKO2UY#&7  
    bRemoved=TRUE; y#Dh)~|k  
    KeyCount--; pGD@R=8  
    break; xMr,\r'+  
   } JQ?`l)4  
  } M5{#!d}^D  
 } 1.14tS-}[4  
 return bRemoved; w_{tS\  
} ]g-%7g|  
JuO47}i]5  
void VerifyWindow() ~,/@]6S&Y  
{ ?t YZ/  
 for(int i=0;i<MAX_KEY;i++){ :)1"yo\  
  if(hCallWnd!=NULL){ P<g(i 6]  
   if(!IsWindow(hCallWnd)){ }{R*pmv$bN  
    hCallWnd=NULL; NQ`D"n  
    HotKey=0; ]5'$EAsuW  
    HotKeyMask=0; 8m"k3:e^  
    KeyCount--; v+LJx    
   } (;#c[eKy  
  } 8>YF}\D V  
 } \Kf\%Q  
} )- W1Wtom  
zT>!xGTu7~  
BOOL CHookApp::InitInstance() AW5iwq6p  
{ ET.jjV  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); c)#P}Ai  
 hins=AfxGetInstanceHandle(); X +!+&RAN*  
 InitHotkey(); !<M eWo  
 return CWinApp::InitInstance(); )JzY%a SP  
} uzdPA'u  
]FCP|Jz  
int CHookApp::ExitInstance() CM?:\$ 4  
{ u%C oo  
 VerifyWindow(); B@F@,?K4%  
 UnInit(); o-6d$c}{f  
 return CWinApp::ExitInstance(); `<9>X9.+  
} LGt>=|=bj  
9rEBq&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 6U{A6hH]  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) T#B#q1/  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ dJR[9T_OF  
#if _MSC_VER > 1000 sqKx?r72  
#pragma once wqo:gW_  
#endif // _MSC_VER > 1000 2|;|C8C  
ZPZh6^cc  
class CCaptureDlg : public CDialog os5$(  
{ Vg'R=+Wb  
 // Construction &Ym):pc  
 public: m|q,i xg  
  BOOL bTray; (~DW_+?]'  
  BOOL bRegistered; 9w-\K]  
  BOOL RegisterHotkey(); *s4|'KS2o  
  UCHAR cKey; [Vs\r&qL  
  UCHAR cMask; iaL@- dg  
  void DeleteIcon(); ~ YH?wdT  
  void AddIcon(); E`TZ:W]r,  
  UINT nCount; @6UtnX'd  
  void SaveBmp(); a/ A c^!(  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ko@ej^  
  // Dialog Data L"ho|v9:  
  //{{AFX_DATA(CCaptureDlg) `N\ ^JAGW  
  enum { IDD = IDD_CAPTURE_DIALOG }; :9QU\{2  
  CComboBox m_Key; g`pq*D  
  BOOL m_bControl; mn@1&#c4y  
  BOOL m_bAlt; Ze V@ X  
  BOOL m_bShift; S"!6]!~^  
  CString m_Path; ZN8j})lE  
  CString m_Number; # `=Zc7gf  
  //}}AFX_DATA r~,y3L6ic  
  // ClassWizard generated virtual function overrides /V,xSK9.&  
  //{{AFX_VIRTUAL(CCaptureDlg) R&cT Md  
 public: vgeqH[:  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *aCL/:  
 protected: =d8Rij-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +0Q   
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :^y!z1\2(7  
  //}}AFX_VIRTUAL lgews"  
  // Implementation WX4sTxJK  
 protected: TO Hz3=  
  HICON m_hIcon; %DSr@IX  
  // Generated message map functions hi,=" /9  
  //{{AFX_MSG(CCaptureDlg) &>qUT]w  
  virtual BOOL OnInitDialog(); 7$<pdayd  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); &m3-][ !n  
  afx_msg void OnPaint(); eDpi0htm  
  afx_msg HCURSOR OnQueryDragIcon(); htB7 j(  
  virtual void OnCancel(); +;W%v7 %<  
  afx_msg void OnAbout(); ^(JrOh'  
  afx_msg void OnBrowse(); `%Fp'`ZM$8  
  afx_msg void OnChange(); OG}890$n  
 //}}AFX_MSG x;[ .ZzQ  
 DECLARE_MESSAGE_MAP() n~629&  
}; d.+*o  
#endif PtkMzhX  
\d"\7SA  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Zbnxs.i!  
#include "stdafx.h" 9p8ajlYg,  
#include "Capture.h" d&^b=d FDu  
#include "CaptureDlg.h" P8m0]T.&x  
#include <windowsx.h> e=9/3?El  
#pragma comment(lib,"hook.lib") i\CA6I  
#ifdef _DEBUG 7RT{RE  
#define new DEBUG_NEW wm@j(h4  
#undef THIS_FILE Onx6Fy]L  
static char THIS_FILE[] = __FILE__; 3#t9pI4  
#endif IRg2\Hq  
#define IDM_SHELL WM_USER+1  /!ElAL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >7BP}5`.;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 30HUY?'K  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A"S"La%"  
class CAboutDlg : public CDialog L$=R/l  
{ M !6Fnj  
 public: >n,_Aj c  
  CAboutDlg(); Q+1ot,R  
  // Dialog Data 8fqabR  
  //{{AFX_DATA(CAboutDlg) wKpGJ& {  
  enum { IDD = IDD_ABOUTBOX }; i6paNHi*  
  //}}AFX_DATA [<=RsD_q~  
  // ClassWizard generated virtual function overrides :=Zd)i)3  
  //{{AFX_VIRTUAL(CAboutDlg) . Z&5TK4I  
 protected: o'lG9ePM|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `p\%ha!,w  
  //}}AFX_VIRTUAL 5x@ U<  
  // Implementation |&@q$d  
 protected: \>S.nW  
  //{{AFX_MSG(CAboutDlg) PSc=k0D  
  //}}AFX_MSG $R}C(k ;?  
  DECLARE_MESSAGE_MAP() CRo'r/G  
}; %ZoJu  
lH3.q4D 5  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Gxd/t#;  
{ `&NFl'l1C  
 //{{AFX_DATA_INIT(CAboutDlg) v.W!  
 //}}AFX_DATA_INIT "5eD >!  
} \];|$FQg  
?`TJ0("z"  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) &m5^ YN$b  
{ L@\t] ~  
 CDialog::DoDataExchange(pDX); W,~*pyLdO  
 //{{AFX_DATA_MAP(CAboutDlg) ++~ G\T9H  
 //}}AFX_DATA_MAP 1tXc7NA<  
} d*+}_EV)Y3  
"dCIg{j   
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) b!g)/%C  
 //{{AFX_MSG_MAP(CAboutDlg) 9-n]_AF`0  
 // No message handlers DSs/D1mj&  
 //}}AFX_MSG_MAP <vl(a*4a  
END_MESSAGE_MAP() )[hs#nKTh  
!&OdbRHM  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Kj?)]Z4  
: CDialog(CCaptureDlg::IDD, pParent) cPIyD?c  
{ 8TYh&n=r  
 //{{AFX_DATA_INIT(CCaptureDlg) _dd_Z40R  
  m_bControl = FALSE; w'}s'gGE  
  m_bAlt = FALSE; ` .`:~_OE  
  m_bShift = FALSE; ]}SV%*{ %  
  m_Path = _T("c:\\"); R{}_Qb  
  m_Number = _T("0 picture captured."); !& c%!*  
  nCount=0; > X  AB#  
  bRegistered=FALSE; (NUXK  
  bTray=FALSE; f]1 $`  
 //}}AFX_DATA_INIT o,k#ft<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ty b_'|?rW  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); T\wOGaCW  
} x75;-q  
3=]/+{B  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) TPb&";4ROf  
{ a?Om;-i2`S  
 CDialog::DoDataExchange(pDX); ip'v<%,Q3"  
 //{{AFX_DATA_MAP(CCaptureDlg) TJ>YJ D  
  DDX_Control(pDX, IDC_KEY, m_Key); kk126?V]_  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); w32F?78]  
  DDX_Check(pDX, IDC_ALT, m_bAlt); AkjoD7.*  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); h1>.w pr  
  DDX_Text(pDX, IDC_PATH, m_Path); ,=!s;+lu{  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ZHen:  
 //}}AFX_DATA_MAP zX=%BL?  
} :8n?G  
.aZB?M W  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :x q^T  
//{{AFX_MSG_MAP(CCaptureDlg) 9^S rOW6~  
 ON_WM_SYSCOMMAND() W(ZEqH2  
 ON_WM_PAINT() jM*wm~4>@  
 ON_WM_QUERYDRAGICON() IAd ^$9  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .*k!Zl*  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;2 o{ 6  
 ON_BN_CLICKED(ID_CHANGE, OnChange) JF &$'  
//}}AFX_MSG_MAP k'$7RjCu  
END_MESSAGE_MAP() lItr*,A]  
=uwG.,lC  
BOOL CCaptureDlg::OnInitDialog() O'S xTwO  
{ >y+j!)\  
 CDialog::OnInitDialog(); \mN?5QCcE  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); p38s&\-kEN  
 ASSERT(IDM_ABOUTBOX < 0xF000); L%9yFg%u  
 CMenu* pSysMenu = GetSystemMenu(FALSE); avS9"e  
 if (pSysMenu != NULL) gKU*@`6G  
 { jbOzbxR?  
  CString strAboutMenu; ^(xVjsHp#  
  strAboutMenu.LoadString(IDS_ABOUTBOX); AO$aWyI  
  if (!strAboutMenu.IsEmpty()) W6B o\UK  
  { !/&~Feb  
   pSysMenu->AppendMenu(MF_SEPARATOR); tORDtMM9+  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); GmGq69]J*  
  } n;b 9f|&z  
 } fZd~},X  
 SetIcon(m_hIcon, TRUE); // Set big icon :+DAzjwO<  
 SetIcon(m_hIcon, FALSE); // Set small icon >fR#U"KPAB  
 m_Key.SetCurSel(0); mR{%f?B  
 RegisterHotkey(); Q[O U`   
 CMenu* pMenu=GetSystemMenu(FALSE); '9wD+'c=A  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); s|!b: Ms`  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); D/{Spw@  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _ )^n[_E  
 return TRUE; // return TRUE unless you set the focus to a control /=OSGIJzm  
} b!37:V\#}  
X>jwjRK $  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) q33!X!br  
{ r52,f%nlm  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) uP ?gGo  
 { [/t/694  
  CAboutDlg dlgAbout; qpc2;3*7  
  dlgAbout.DoModal(); S4~;bsSx  
 } gk6j5 $Y"<  
 else ^?[^o\/@R  
 { PzTTL=G +  
  CDialog::OnSysCommand(nID, lParam); EZiGi[t7  
 } &4MVk3SLx#  
} ZsPBs4<p  
;lWy?53=@  
void CCaptureDlg::OnPaint() [dL?N  
{ -p !KsU  
 if (IsIconic()) .J\U|r  
 { f4T-=` SO  
  CPaintDC dc(this); // device context for painting ?Ve5}N  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); J=]w$e ?.P  
  // Center icon in client rectangle Zr 2QeLQC(  
  int cxIcon = GetSystemMetrics(SM_CXICON); FkE CY  
  int cyIcon = GetSystemMetrics(SM_CYICON); f{z%PI[  
  CRect rect; {78*S R  
  GetClientRect(&rect); {K0T%.G  
  int x = (rect.Width() - cxIcon + 1) / 2; uJp}9B60_  
  int y = (rect.Height() - cyIcon + 1) / 2; g9"_BG  
  // Draw the icon 1y8:tri>N  
  dc.DrawIcon(x, y, m_hIcon); 7#|NQ=yd  
 } Sdt2D  
 else &akMj@4;R  
 { s9:2aLZ {  
  CDialog::OnPaint(); Y.*lO  
 } 3yD5u  
} |-aj$u%~  
1aMBCh<}JN  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3x9C]  
{ TuCOoz@d  
 return (HCURSOR) m_hIcon; R;V(D3  
} w)8@Tu:Q  
+ow ^xiD  
void CCaptureDlg::OnCancel() ~ pdf'  
{ mg,f>(  
 if(bTray) {:FITF3o  
  DeleteIcon(); &Y=NUDt_  
  CDialog::OnCancel(); fR[!=-6^f  
} 17Gdu[E  
?h3Ow`1G  
void CCaptureDlg::OnAbout() m<f{7]fi5  
{ hA\8&pI;  
 CAboutDlg dlg; FW.dHvNX  
 dlg.DoModal(); QBn>@jq  
} &{=~)>h  
0j/81Y}p  
void CCaptureDlg::OnBrowse() m[7:p{  
{ h'fD3Gr&  
 CString str; &s;%(c04A  
 BROWSEINFO bi; pn7 :")Zx  
 char name[MAX_PATH]; A>g$[  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); | uZ=S]V@  
 bi.hwndOwner=GetSafeHwnd(); gX _BJ6  
 bi.pszDisplayName=name; J+|ohA  
 bi.lpszTitle="Select folder"; q@-qA]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7VXeu+-P  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); imhq*f#A[  
 if(idl==NULL) l?1!h2z%  
  return; p+7BsW.l  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !^fJAtCN]  
 str.ReleaseBuffer(); \mu9ikZ<  
 m_Path=str; ,] {NZ9  
 if(str.GetAt(str.GetLength()-1)!='\\') EXFxiw  
  m_Path+="\\"; yl ;'Ru:  
 UpdateData(FALSE); ,"VQ 0Z1  
} q |^O  
0amz#VIB<u  
void CCaptureDlg::SaveBmp() @YB\ PVhW  
{ k51s*U6=  
 CDC dc; O]g+z$2o  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); fDqXM;a"  
 CBitmap bm; ">QY'r  
 int Width=GetSystemMetrics(SM_CXSCREEN); rpT<cCem1  
 int Height=GetSystemMetrics(SM_CYSCREEN); N]<gHGj}  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Z%{f[|h9}  
 CDC tdc; '> Q$5R1  
 tdc.CreateCompatibleDC(&dc); U ^9oc&  
 CBitmap*pOld=tdc.SelectObject(&bm); S+y2eP G  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); l.W:6", w  
 tdc.SelectObject(pOld); F`Y<(]+   
 BITMAP btm; KUyJ"q<W  
 bm.GetBitmap(&btm); 5#o,]tP  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; (*x "6)`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); k0IU~y%  
 BITMAPINFOHEADER bih; ] zY  
 bih.biBitCount=btm.bmBitsPixel; WO9/rF_  
 bih.biClrImportant=0; bC{8yV=)  
 bih.biClrUsed=0; M<srJ8|'  
 bih.biCompression=0; w1_Ux<RF  
 bih.biHeight=btm.bmHeight; K)@}Ok"#\4  
 bih.biPlanes=1; WLl9>v^1  
 bih.biSize=sizeof(BITMAPINFOHEADER); j1kc&(  
 bih.biSizeImage=size; `x VA]GR4c  
 bih.biWidth=btm.bmWidth; zNf5OItx  
 bih.biXPelsPerMeter=0; UIj/Id  
 bih.biYPelsPerMeter=0; dZgfls  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); NLGr=*dq  
 static int filecount=0; ^e,RM_.  
 CString name; i?/?{p$#a-  
 name.Format("pict%04d.bmp",filecount++); `7_LJ \>I  
 name=m_Path+name; ~&:R\  
 BITMAPFILEHEADER bfh; ECzNByP  
 bfh.bfReserved1=bfh.bfReserved2=0; \(FDR  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _64@zdL+  
 bfh.bfSize=54+size; -JENY|6  
 bfh.bfOffBits=54; mD)O\.uA  
 CFile bf; ix+x-G  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ i|^6s87"N2  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *~uuCLv_  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); { bn#:75r  
  bf.WriteHuge(lpData,size); 3p W MS&  
  bf.Close(); AZy2Pu56  
  nCount++; []0~9,u  
 } }AqD0Qd2Hj  
 GlobalFreePtr(lpData); Y7)@(7G)\  
 if(nCount==1) 2oG|l!C  
  m_Number.Format("%d picture captured.",nCount); Ig KAD#2a  
 else h,'+w  
  m_Number.Format("%d pictures captured.",nCount); @EZONKT  
  UpdateData(FALSE); l5ds`uR#  
} q*nz4QTOE  
W@dY:N}  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) UJ$:5*S=u  
{ T6roz  
 if(pMsg -> message == WM_KEYDOWN) ,P@-DDJ  
 { *$C[![   
  if(pMsg -> wParam == VK_ESCAPE)  0QqzS  
   return TRUE; HjS^ nYl  
  if(pMsg -> wParam == VK_RETURN) kG$8E  
   return TRUE; =+S3S{\CK  
 } !@Lc/'w  
 return CDialog::PreTranslateMessage(pMsg); CHit  
} E57{*C  
xN8JrZE&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Jk`)`94 I  
{ ok2~B._+;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :[f`HY&  
  SaveBmp(); =Zy!',,d,9  
  return FALSE; X", 0VO  
} f94jMzH9z  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ H<}eoU.  
 CMenu pop; :&)/vq  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); O f@#VZ  
 CMenu*pMenu=pop.GetSubMenu(0); {dXBXC/Ju  
 pMenu->SetDefaultItem(ID_EXITICON); '\B"g@if  
 CPoint pt; `j}d=zZ  
 GetCursorPos(&pt); b|o!&9Yyr  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); TeCpT2!5j  
 if(id==ID_EXITICON) .<^Y E%  
  DeleteIcon(); _C,@eu"9V  
 else if(id==ID_EXIT) f\U&M,L\ '  
  OnCancel(); @[lc0_ b  
 return FALSE; 7O{O')o!  
} AWXpA1(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?lN8~Ze  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) M2Fj)w2   
 AddIcon(); '#PqI)P  
 return res; wKS-O%?  
} gam#6 s  
&MZy;Sq  
void CCaptureDlg::AddIcon() yUmsE-W  
{ / &D$kxz  
 NOTIFYICONDATA data; \R\@t] >Y  
 data.cbSize=sizeof(NOTIFYICONDATA); L2.`1Aag  
 CString tip; .`>l.gmi&  
 tip.LoadString(IDS_ICONTIP); q,+kPhHEgy  
 data.hIcon=GetIcon(0); t`YZ)>Ws  
 data.hWnd=GetSafeHwnd(); TTZxkK  
 strcpy(data.szTip,tip); F*JvpI[7n  
 data.uCallbackMessage=IDM_SHELL; (2bZ]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !aw#',r8m  
 data.uID=98; N^( lUba  
 Shell_NotifyIcon(NIM_ADD,&data); l()MYuLNV  
 ShowWindow(SW_HIDE); apD=>O  
 bTray=TRUE; o?mXxL)  
} N46$EsO!h  
vd7N&c9  
void CCaptureDlg::DeleteIcon() 0$L0fhw.  
{ _OU.JrqC  
 NOTIFYICONDATA data; ;i9<y8Dha  
 data.cbSize=sizeof(NOTIFYICONDATA);  Vm;Q w  
 data.hWnd=GetSafeHwnd(); 6$fnQcpJ  
 data.uID=98; + i@yZfT  
 Shell_NotifyIcon(NIM_DELETE,&data); =Cy>$/H64  
 ShowWindow(SW_SHOW); tK|9qs<%  
 SetForegroundWindow(); t)gi.Ed1"L  
 ShowWindow(SW_SHOWNORMAL); yC 7Vb P  
 bTray=FALSE; QK!:q{  
} 3 E!<p  
"R2t&X[9  
void CCaptureDlg::OnChange() DxKfWb5 R  
{ w-H%B`/  
 RegisterHotkey(); LX\*4[0%K  
} C7 ]DJn  
d9-mWz(V+  
BOOL CCaptureDlg::RegisterHotkey() '*N9"C  
{ k/_8!^:'  
 UpdateData(); |[owNV>  
 UCHAR mask=0; 7XVzd]jH  
 UCHAR key=0; ocl47)  
 if(m_bControl) >PJtG]D  
  mask|=4; {#1j"  
 if(m_bAlt) 2'<=H76  
  mask|=2; De nt?  
 if(m_bShift) @9uYmkcV  
  mask|=1; g7 Md  
  key=Key_Table[m_Key.GetCurSel()]; -<51CDw,  
 if(bRegistered){ UhSh(E8p>  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 9U=fJrj'u  
  bRegistered=FALSE; 5Hwo)S]r  
 } VqClM  
 cMask=mask; y^!E "  
 cKey=key; cF_;hD|YZ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +-aU+7tu  
 return bRegistered; \7t5U7v8U  
} `?]rr0.}hp  
yD[zzEuQ  
  四、小结 ! nCjA\$  
7O+Ij9+{n  
  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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