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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: Q!I><u  
  Qo*OC 9E`  
  一、实现方法 ;1>V7+/  
ZmJ<FF4  
  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: OM`Ws5W}f  
^b^buCYw  
#pragma data_seg("shareddata") AKS. XW  
HHOOK hHook =NULL; //钩子句柄 |3hNTH?  
UINT nHookCount =0; //挂接的程序数目 Ix~rBD9  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Ds{DVdqA$c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 LCe6](Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 57_AJT hR  
static int KeyCount =0; Iv u'0vF  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 _{GD\Ai_W  
#pragma data_seg() 8v=t-GJW  
E 0@u|  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ]Y$jc  
m';4`Y5-  
  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: *Xn6yL9  
:4LWm<P  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR l7Wdbx5x0  
cKey,UCHAR cMask) oxJAI4{y 4  
{ J<&?Hb*|  
 BOOL bAdded=FALSE; omT^jh  
 for(int index=0;index<MAX_KEY;index++){ zQ(`pld  
  if(hCallWnd[index]==0){ !wZIXpeL  
   hCallWnd[index]=hWnd; u)%/df qzZ  
   HotKey[index]=cKey; PtGFLM9R  
   HotKeyMask[index]=cMask; 9S<V5$}  
   bAdded=TRUE; e488}h6#m  
   KeyCount++; K 28s<i`  
   break; (-@I'CFd  
  } &y-z[GR[{  
 } D}N4*L1  
 return bAdded; *q@3yB}  
} db>"2EE  
//删除热键 S7@/d HN  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) R_vK^Da  
{ Sae*VvT6  
 BOOL bRemoved=FALSE; N,*'")k9  
 for(int index=0;index<MAX_KEY;index++){ vtc%MG1  
  if(hCallWnd[index]==hWnd){ N37CAbw0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ U? ;Q\=>  
    hCallWnd[index]=NULL; #E#@6ZomT  
    HotKey[index]=0; (^]3l%Ed  
    HotKeyMask[index]=0; z9v70 q  
    bRemoved=TRUE; }n +MVJ;dG  
    KeyCount--; (@bq@0g  
    break; QoMa+QTuc  
   } 4~hP25q  
  } ={jj'X9  
 } 5D mSgP:  
 return bRemoved; biU ?>R  
} M7YbRl  
=>O{hT ^F  
& sXMB  
  DLL中的钩子函数如下: : z\||f  
kZfj"+p_S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) eu//Q'W  
{ *g4Uo{  
 BOOL bProcessed=FALSE; .Vs|&c2im  
 if(HC_ACTION==nCode) 7324#HwS  
 { 5JG`FRW!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 om6`>I*  
   switch(wParam) Vygh|UEo  
   {   Gc;-zq  
    case VK_MENU: GKG:iR)  
     MaskBits&=~ALTBIT; +Q"XwxL<6  
     break; qVvnl  
    case VK_CONTROL: -WGlOpg0;  
     MaskBits&=~CTRLBIT; fe}RmnAC  
     break; "kKIv|`  
    case VK_SHIFT: tv; ?W=&P  
     MaskBits&=~SHIFTBIT; 2/x~w~3U  
     break; Z`n "}{  
    default: //judge the key and send message ^}<]sjmk  
     break; C\0,D9  
   } >}d6)s|   
   for(int index=0;index<MAX_KEY;index++){ fr8';Jm  
    if(hCallWnd[index]==NULL) @[Wf!8_  
     continue;  vF'IK,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~N )(|N  
    { hK3Twzte  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8L`wib2  
     bProcessed=TRUE; ^Gi WU +`  
    } 'G`xD3 E3,  
   } yz)Nco]  
  } ler$HA%F]  
  else if((lParam&0xc000ffff)==1){ //有键按下 W~s:SN  
   switch(wParam) _6]tbni?v  
   { Mv:\T%]  
    case VK_MENU: `*i:z'  
     MaskBits|=ALTBIT; 8rNf4]5@X(  
     break; -.Zy(  
    case VK_CONTROL: ft!D2M  
     MaskBits|=CTRLBIT; x@|10GC#:  
     break; _J,*0~O$  
    case VK_SHIFT: Jt)J1CA Yo  
     MaskBits|=SHIFTBIT; -:Q"aeC5  
     break; N_(-\\mq  
    default: //judge the key and send message VuH }@  
     break; tn|H~iF{  
   } khQ fLA  
   for(int index=0;index<MAX_KEY;index++){ `'pfBVBz  
    if(hCallWnd[index]==NULL) eGWwPSIp  
     continue; "M,Hm!j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w!}kcn<  
    { hz h3p[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); NYR:dH]N~d  
     bProcessed=TRUE; r_o\72  
    } C @P$RVS  
   } g$z6*bL  
  } T6\d]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 hl,x|.f}4Y  
   for(int index=0;index<MAX_KEY;index++){ `J;g~#/k  
    if(hCallWnd[index]==NULL) 1TgD;qX  
     continue; +77j2W_0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +;q` A 1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); E:P_CDSd]  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 "a<:fEsSE  
   } C~M,N|m+^  
  } qI[AsM+  
 } On,z# A  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %)e&"mq!|  
} hF1Lj=x  
]v_u2f'  
  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>]*D68  
MQX9BJ%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SOS|3q_`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r4]hcoU  
/5?tXH"  
  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: ~^o YPd52*  
) LohB,?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6dRvx;d  
{ OZe`>Q6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) - P4X@s_;  
 { 5&]a8p{  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Uu|R]azbO  
  SaveBmp(); \WZSY||C|_  
  return FALSE; &B$%|~Y5  
 } M2A_T.F=H  
 …… //其它处理及默认处理 sDkO!P  
} TR:4$92:H  
ayLINpL  
[MeFj!(  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 JE;!~=   
cq$ _$jRx  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 WT1d'@LY  
MO|8A18B  
  二、编程步骤 )ZfbM|  
l^__oam  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; QL-E4]   
M[0NB2`Wp  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; q oz[x  
VrJf g  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 5zF$Q{3  
,F=FM>o  
  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; X6r3$2!  
!" @<!  
  5、 添加代码,编译运行程序。 k%;oc$0G-3  
7<LCX{Uw  
三、程序代码 K>#QC  
tl=e!  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL t*Z4&Sy^  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) .F0Q< s9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ h<g2aL21?F  
#if _MSC_VER > 1000 } ;d=  
#pragma once Z3-=TN  
#endif // _MSC_VER > 1000 43!E>mq  
#ifndef __AFXWIN_H__ :\%ZTBLL  
#error include 'stdafx.h' before including this file for PCH (b7',:_U7  
#endif iz27yXHZ~  
#include "resource.h" // main symbols >|1-o;UU  
class CHookApp : public CWinApp xr31< 4B  
{ WFvVu3  
 public: Dt'bbX'edw  
  CHookApp(); t* =i8`8  
  // Overrides L^Fb;sJYI  
  // ClassWizard generated virtual function overrides "XU)(<p  
  //{{AFX_VIRTUAL(CHookApp) U(hIT9  
 public: $Q=S`z=  
  virtual BOOL InitInstance(); ^g"%:4zO  
  virtual int ExitInstance(); ZSLvr-,D  
  //}}AFX_VIRTUAL !_-Uwg  
  //{{AFX_MSG(CHookApp) {v2[x W  
  // NOTE - the ClassWizard will add and remove member functions here. m1RjD$fM  
  // DO NOT EDIT what you see in these blocks of generated code ! =Nr?F '<  
  //}}AFX_MSG r%`3*<ALV)  
  DECLARE_MESSAGE_MAP() NZ% v{?  
}; b{.Y?.U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); KB gFS%-W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2|${2u`$&y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =0>[-:Z  
BOOL InitHotkey(); x.'Ys1M  
BOOL UnInit(); \cHF V  
#endif _:KeSskuO  
k|cP]p4,  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. O{EbL5p  
#include "stdafx.h" /mK]O7O7  
#include "hook.h" A $l  
#include <windowsx.h> Ba76~-gK$  
#ifdef _DEBUG ;7(vqm<V2~  
#define new DEBUG_NEW w NMA)S  
#undef THIS_FILE :#=B wdC  
static char THIS_FILE[] = __FILE__; m[hHaX  
#endif Q}1qt4xy*  
#define MAX_KEY 100 -#r=  
#define CTRLBIT 0x04 Ib"fHLWA^!  
#define ALTBIT 0x02 <,J O  
#define SHIFTBIT 0x01 u`pw'3hY  
#pragma data_seg("shareddata") [+qB^6I+P%  
HHOOK hHook =NULL; ,W>-MPJn[8  
UINT nHookCount =0; ;6`7 \  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Kn}Y7B{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT pAyUQe;X#  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey WPPD vB  
static int KeyCount =0; -$`q:j  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift fdgjTX  
#pragma data_seg() tZ:fh  p  
HINSTANCE hins; BfQ#5  
void VerifyWindow(); 0,6! 6>BOT  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) wIF)(t-):  
//{{AFX_MSG_MAP(CHookApp) \ (U|&  
// NOTE - the ClassWizard will add and remove mapping macros here. {T3wOi  
// DO NOT EDIT what you see in these blocks of generated code! X @X`,/{X  
//}}AFX_MSG_MAP iN2591S  
END_MESSAGE_MAP() ucUu hS5  
\psO$TxF=  
CHookApp::CHookApp() 5Z13s  
{ r(g2&}o\  
 // TODO: add construction code here, GQ*or>R1  
 // Place all significant initialization in InitInstance bs)Ro/7}  
} 3Q_)Xs r`  
)b,FE}YX  
CHookApp theApp; hO(A_Bw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ZC)m&V 1  
{ `-5gsJ  
 BOOL bProcessed=FALSE; t!0 IQ9\[*  
 if(HC_ACTION==nCode) gKRlXVS  
 { |j4;XaG)  
  if((lParam&0xc0000000)==0xc0000000){// Key up _ + >V(,{G  
   switch(wParam) _ FN#Vq2  
   { 3 op{h6  
    case VK_MENU: Jv~^hN2  
     MaskBits&=~ALTBIT; b3q&CJ4|  
     break; /=KEM gI?  
    case VK_CONTROL: J?f7!F:8  
     MaskBits&=~CTRLBIT; J n'SGR  
     break; ^C;ULUn3  
    case VK_SHIFT: |43Oc:Ah+  
     MaskBits&=~SHIFTBIT; nsu RG  
     break; H)5"<=]  
    default: //judge the key and send message ?F|F~A8dr  
     break; 5zH_yZ@+  
   } z!)@`?  
   for(int index=0;index<MAX_KEY;index++){ 8#RL2)7Uy`  
    if(hCallWnd[index]==NULL)  x(A6RRh  
     continue; w+hpi5OH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Uq.hCb`:  
    { B9]bv]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4 Z&KR<2Z  
     bProcessed=TRUE; ^(7Qz&q  
    } Ce} m_  
   } Uf~5Fc1d =  
  } 2 e&M/{  
  else if((lParam&0xc000ffff)==1){ //Key down mnU8i=v0 A  
   switch(wParam) p+${_w>pl{  
   { 1?,C d  
    case VK_MENU: ~\ v"xV  
     MaskBits|=ALTBIT; 2h1P!4W85  
     break; lF\2a&YRbn  
    case VK_CONTROL: Xi!e=5&Pa  
     MaskBits|=CTRLBIT; }+K=>.  
     break; k{cPiY^  
    case VK_SHIFT: dyB@qh~H  
     MaskBits|=SHIFTBIT; i$CF*%+t  
     break; mcxD#+H 3  
    default: //judge the key and send message ,?wxW  
     break; 7nZ3u _~  
   } Nwk^r75lq  
   for(int index=0;index<MAX_KEY;index++) \Npvm49  
   { rnBp2'EM  
    if(hCallWnd[index]==NULL) & 5QvUn  
     continue; x|g2H.n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) As j<u!L  
    { otQ G6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9G4os!x)  
     bProcessed=TRUE; xp*d:  
    } IaO*{1re  
   } 3!i{4/  
  } hz5t/E  
  if(!bProcessed){ Q<(aU{  
   for(int index=0;index<MAX_KEY;index++){ SZvC4lOn#  
    if(hCallWnd[index]==NULL) GZm=>!T  
     continue; gwFW+*h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JX`>N(K4\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); gZ=$bR  
   } j_S3<wEJ  
  } *E-MJCv  
 } (iht LFp  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); bb$1zSA  
} E CPSE {  
,Qj\_vr@  
BOOL InitHotkey() @2TfW]6  
{ Bk5ft4v-  
 if(hHook!=NULL){ i*mI-l  
  nHookCount++; Q+Eqaz`  
  return TRUE; =nlj|S ~3  
 } ^cuH\&&7  
 else /'^ BH A|h  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "tu*(>'~5  
  if(hHook!=NULL) W!1 B~NH#  
   nHookCount++; k7M{+X6[  
  return (hHook!=NULL); 7**zO3 H  
} ::@JL  
BOOL UnInit() J!}R>mR  
{ ajX] ui  
 if(nHookCount>1){ rw?wlBEG%  
  nHookCount--; 8yM8O #S  
  return TRUE; }&%&0$%  
 } |*L/ m0'L  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 845\u&  
 if(unhooked==TRUE){ (@S 9>z4s  
  nHookCount=0; |I3&a=,  
  hHook=NULL; ER:K^ Za  
 } (U:6vk3Q  
 return unhooked; >E WK cocM  
} 3M>y.MS  
milQxSpj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) e' |c59E  
{ 2hTsjJ!'  
 BOOL bAdded=FALSE; (A-Uo   
 for(int index=0;index<MAX_KEY;index++){ y|3!E>Up  
  if(hCallWnd[index]==0){ Pt'=_^Io  
   hCallWnd[index]=hWnd; 2L=(-CH9]  
   HotKey[index]=cKey; \!k\%j 9  
   HotKeyMask[index]=cMask; A@reIt  
   bAdded=TRUE; ?28)l 4 Ml  
   KeyCount++; In*0.   
   break; {fMo#`9=  
  } Z1wfy\9c8  
 } 5xa!L@)`wF  
 return bAdded; S4OOm[8  
} J$-1odL0Z  
jI$7vmO  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ZL9|/ PY  
{ ,.&D{ $1W  
 BOOL bRemoved=FALSE; 3w! NTvp  
 for(int index=0;index<MAX_KEY;index++){ z'0 =3  
  if(hCallWnd[index]==hWnd){ S(:|S(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Az/P;C=  
    hCallWnd[index]=NULL; k0xm-  
    HotKey[index]=0; @"m+9ZY  
    HotKeyMask[index]=0; 9xL` i-7]  
    bRemoved=TRUE; 2-^ ['R  
    KeyCount--; rEs!gGNN  
    break; {wD "|K  
   } P5'VLnE R{  
  } ?l`|j*  
 } \*c=bz&l  
 return bRemoved; s*vtCdrE.  
} .C1g Dry]  
pWKI^S  
void VerifyWindow() #?~G\Ux0/  
{ ,Uy~O(F t  
 for(int i=0;i<MAX_KEY;i++){ Po.izE!C  
  if(hCallWnd!=NULL){ P+,YWp  
   if(!IsWindow(hCallWnd)){ oM,UQ!x <  
    hCallWnd=NULL; p&HkR^.S  
    HotKey=0; c32"$g  
    HotKeyMask=0; A \Z_br  
    KeyCount--; G ahY+$L,  
   } c43&[xP Lz  
  } q4Y'yp`?K;  
 } UO-,A j*wW  
} %gTY7LIe1z  
I!.-}]k  
BOOL CHookApp::InitInstance() UBx0Z0Y  
{ zZS,<Z  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); pH0MVu(W  
 hins=AfxGetInstanceHandle(); v&`n}lS  
 InitHotkey(); ^{-Z3Yxd  
 return CWinApp::InitInstance(); &p=(0$0&-  
} +lJD7=%K]Z  
B:)vPO+ d  
int CHookApp::ExitInstance() _F jax  
{ (KR.dxzjf  
 VerifyWindow(); q&,uJo  
 UnInit(); ; $UB@)7%  
 return CWinApp::ExitInstance(); ,k m`-6.2?  
} lsVg'k/Z!  
q{7+N1 "  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 5_SxX@fW %  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) u)l[*";S  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ &>XSQB(&%  
#if _MSC_VER > 1000 5%" 0  
#pragma once fjS#  
#endif // _MSC_VER > 1000 kFi=^#J{  
8+~'T|  
class CCaptureDlg : public CDialog ;5}"2hU>  
{ r4 ;nkx  
 // Construction Chtls;Ph[  
 public: ET|4a(x  
  BOOL bTray; ,D`\ R V  
  BOOL bRegistered; 5ma~Pjt8}  
  BOOL RegisterHotkey(); hy@e(k|S]U  
  UCHAR cKey; > Cx;h=  
  UCHAR cMask; _Tf0L<A'R  
  void DeleteIcon(); q_:B=w+bC  
  void AddIcon(); vFK(Dx  
  UINT nCount; SuA`F|7?P  
  void SaveBmp(); Gdlx0i  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor r D|Bj(X8  
  // Dialog Data AaJz3oncJ  
  //{{AFX_DATA(CCaptureDlg) OWmI$_L  
  enum { IDD = IDD_CAPTURE_DIALOG }; QC+BEN$  
  CComboBox m_Key; 58Z,(4:E  
  BOOL m_bControl; _i0,?U2C  
  BOOL m_bAlt; s?&UFyYb,  
  BOOL m_bShift; _?9|,  
  CString m_Path; +4K'KpFzZ  
  CString m_Number; %X(|Z4dL  
  //}}AFX_DATA 5Veybchy "  
  // ClassWizard generated virtual function overrides =UF mN"  
  //{{AFX_VIRTUAL(CCaptureDlg) QkY;O<Y_  
 public: BEii:05  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  !:|D[1m  
 protected: S&~;l/  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @|9V]bk  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7XiR)jYo*  
  //}}AFX_VIRTUAL Tc;j)_C)  
  // Implementation ffh3okyW0  
 protected: 2tdr1+U?g  
  HICON m_hIcon; AO0aOX8_+D  
  // Generated message map functions tR-rW)0K3Q  
  //{{AFX_MSG(CCaptureDlg) #jX%nqMxW  
  virtual BOOL OnInitDialog(); i^6g1"h  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); <@H=XEn  
  afx_msg void OnPaint(); X:gE mcXc  
  afx_msg HCURSOR OnQueryDragIcon(); AO^c=^  
  virtual void OnCancel(); F$H^W@<w  
  afx_msg void OnAbout(); OEj%cB!  
  afx_msg void OnBrowse(); 7a'@NgiGg  
  afx_msg void OnChange(); m*H6\on:  
 //}}AFX_MSG aZYs?b>Gm  
 DECLARE_MESSAGE_MAP() mX QVL.P\  
}; iCZ1ARi  
#endif W8s/"  
h%(0|  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Ih5F\eM  
#include "stdafx.h" H%`|yUE(  
#include "Capture.h" /mFa*~dj2  
#include "CaptureDlg.h" g+92}$_  
#include <windowsx.h> vhu5w#]u*  
#pragma comment(lib,"hook.lib") :X ~{,J  
#ifdef _DEBUG )x&OdFX  
#define new DEBUG_NEW ~0XV[$`L  
#undef THIS_FILE j?9fb  
static char THIS_FILE[] = __FILE__; bY7~b/  
#endif ^1w*$5YI  
#define IDM_SHELL WM_USER+1 @P}!mdH1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uOnyU+fZV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +#0,2 wR#  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ttC+`0+H  
class CAboutDlg : public CDialog ~:lN("9OI  
{ }e0)=*;l  
 public: Zk75GC  
  CAboutDlg(); ,[0rh%%j  
  // Dialog Data <{b#nPc!,#  
  //{{AFX_DATA(CAboutDlg) IBe0?F #  
  enum { IDD = IDD_ABOUTBOX }; s9}VnNr  
  //}}AFX_DATA !JVpR]lWS  
  // ClassWizard generated virtual function overrides dEM=U;  
  //{{AFX_VIRTUAL(CAboutDlg) iWu^m+"k  
 protected: rJ}k!}G  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support i2+vUl|;Z  
  //}}AFX_VIRTUAL >6zXr.  
  // Implementation a76`"(W  
 protected: V61.UEN  
  //{{AFX_MSG(CAboutDlg) zWEt< `1M  
  //}}AFX_MSG 4GTB82V$  
  DECLARE_MESSAGE_MAP() gay6dj^  
}; >\c"U1%E  
+idp1SJ4  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 6N.+  
{ ti^msC8e  
 //{{AFX_DATA_INIT(CAboutDlg) \LZVazXD  
 //}}AFX_DATA_INIT dk4|*l-  
} SRf .8j  
dJwE/s  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ![#>{Q4i  
{ Rt10:9Kz$  
 CDialog::DoDataExchange(pDX); nXnO]wXC  
 //{{AFX_DATA_MAP(CAboutDlg) vx8-~Oq{|;  
 //}}AFX_DATA_MAP .ITR3]$  
} nPS:T|*G  
X[ up$<  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) my^2}>wi  
 //{{AFX_MSG_MAP(CAboutDlg) G*lkVQ6?  
 // No message handlers YjM_8@ <  
 //}}AFX_MSG_MAP C%y!)v_x  
END_MESSAGE_MAP() QL4BD93v  
#b?)fqRJL  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) jsrIZbN  
: CDialog(CCaptureDlg::IDD, pParent) 9!06R-h  
{ ai,Nx:r   
 //{{AFX_DATA_INIT(CCaptureDlg) 5*W<6ia  
  m_bControl = FALSE; F ak"u'~  
  m_bAlt = FALSE; =`MU*Arcs[  
  m_bShift = FALSE; v{dvB:KP5X  
  m_Path = _T("c:\\"); 6$|!_94>*)  
  m_Number = _T("0 picture captured."); %+,7=Wt-  
  nCount=0; &=d0'3k>  
  bRegistered=FALSE; 1SYBq,[])  
  bTray=FALSE; 9 L^:N)-  
 //}}AFX_DATA_INIT Hkck=@>8H*  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 rFPfTpS  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \h}a?T6  
} 2'6:fr=R  
pNzSy"Y$  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) I T\lkF2  
{ ADQ#qA,/  
 CDialog::DoDataExchange(pDX); Q7-d]xJ^  
 //{{AFX_DATA_MAP(CCaptureDlg) x.OCE`  
  DDX_Control(pDX, IDC_KEY, m_Key); .}.63T$h9  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5, <:|/r  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ?Q XS?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ucVn `  
  DDX_Text(pDX, IDC_PATH, m_Path); _(Qec?[^Ps  
  DDX_Text(pDX, IDC_NUMBER, m_Number); }.j09[<  
 //}}AFX_DATA_MAP RC| t-(Z  
} 6 -\ghPo  
pl{Pur ;i  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) yj48GQP]  
//{{AFX_MSG_MAP(CCaptureDlg) )ZA3m _w]  
 ON_WM_SYSCOMMAND() (f*0Wp;  
 ON_WM_PAINT() 17nONhh  
 ON_WM_QUERYDRAGICON() a8Q=_4 l  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6GZ zNhz  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hn bF}AD  
 ON_BN_CLICKED(ID_CHANGE, OnChange) C/{tvY /o  
//}}AFX_MSG_MAP eZ^-gk?  
END_MESSAGE_MAP() -:|1>og  
&b#O=LF  
BOOL CCaptureDlg::OnInitDialog() ))qOsphN  
{ 4x'N#m{p  
 CDialog::OnInitDialog(); U%~L){<V[  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); UmRI! WQl  
 ASSERT(IDM_ABOUTBOX < 0xF000); k}yUD 0Y  
 CMenu* pSysMenu = GetSystemMenu(FALSE); uS%Y$v  
 if (pSysMenu != NULL) `T]1u4^E  
 { rfdT0xfcU  
  CString strAboutMenu; @}{~Ofs  
  strAboutMenu.LoadString(IDS_ABOUTBOX); vQ/&iAyut  
  if (!strAboutMenu.IsEmpty()) E4nj*Lp~+  
  { %j3 *j  
   pSysMenu->AppendMenu(MF_SEPARATOR); 8=%%C:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); DgQw9`W A  
  } ARD&L$AX  
 } ^Cs5A0xo#s  
 SetIcon(m_hIcon, TRUE); // Set big icon oq<n5  
 SetIcon(m_hIcon, FALSE); // Set small icon &u_s*  
 m_Key.SetCurSel(0); UaQR0,#0y  
 RegisterHotkey(); :i4>&4j  
 CMenu* pMenu=GetSystemMenu(FALSE); %0z&k!P  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); SbLx`]rI  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =h4* ^NJ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); l$_Yl&!q$  
 return TRUE; // return TRUE unless you set the focus to a control  3O:gZRxK  
} N!fTt,  
1qw*mV;W)_  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]i3 1@O  
{ 3',|HA /x  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) }BpCa6SAs  
 { lUR7zrwJ]o  
  CAboutDlg dlgAbout; q DQ$Zq[  
  dlgAbout.DoModal(); nzdJ*C  
 } St6U  
 else YuZxKuGy  
 { @GB~rfB[  
  CDialog::OnSysCommand(nID, lParam); XCGJ~  
 } [a&|c%h  
} jo.Sg:7&  
 !XvQm*1  
void CCaptureDlg::OnPaint() Myj 68_wf  
{ 7>a-`"`O  
 if (IsIconic()) Ri}n0}I  
 { $LLy#h?V]  
  CPaintDC dc(this); // device context for painting >^8=_i !  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =c-,uW11[  
  // Center icon in client rectangle 1?6;Oc^  
  int cxIcon = GetSystemMetrics(SM_CXICON); c teUKK.|)  
  int cyIcon = GetSystemMetrics(SM_CYICON); ,<[Q/:}[  
  CRect rect; z8SrZ#mg  
  GetClientRect(&rect); iI2 7N'g  
  int x = (rect.Width() - cxIcon + 1) / 2; liW0v!jBo  
  int y = (rect.Height() - cyIcon + 1) / 2; qeK_w '  
  // Draw the icon r.5}Q?  
  dc.DrawIcon(x, y, m_hIcon); Q)\~=/L b  
 } =kp-[7  
 else W?5u O  
 { .Y8z3O  
  CDialog::OnPaint(); cax]l O  
 } ~Bll\3-=  
} BcMgfa/  
.e $W(}  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;TAf[[P  
{ m"{D}(TA  
 return (HCURSOR) m_hIcon; H1]An'qz,  
} q;dg,Om  
wt;7+  
void CCaptureDlg::OnCancel() *CHLs^)   
{ 8y-Sd\0g  
 if(bTray) E,]G Ek  
  DeleteIcon(); 9'tElpDJ6#  
  CDialog::OnCancel(); o1j_5c PS  
} CzF#feTA  
e12.suv  
void CCaptureDlg::OnAbout() yG)zrRU  
{ Pg]&^d&$  
 CAboutDlg dlg; ]ov>VF,<  
 dlg.DoModal(); !2)$lM1@J  
} SjT8 eH #  
3d qj:4[f  
void CCaptureDlg::OnBrowse() ,k*g `OTW  
{ l2))StEm  
 CString str; WUQlAsme  
 BROWSEINFO bi; YQyf:xJ  
 char name[MAX_PATH]; mHqw,28}  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 2|xNT9RW  
 bi.hwndOwner=GetSafeHwnd(); r Z0+mS'/G  
 bi.pszDisplayName=name; <,%qt_ !  
 bi.lpszTitle="Select folder"; W}<'Y@[ ,  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; lg)jc3  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1gEeZ\B-&  
 if(idl==NULL) 1m*fkM#  
  return; dqU bJc]  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?mdgY1  
 str.ReleaseBuffer(); a#iJXI  
 m_Path=str; 'eNcQJh  
 if(str.GetAt(str.GetLength()-1)!='\\') Zrtyai{8l  
  m_Path+="\\"; y$=$Yc&Ub  
 UpdateData(FALSE); 29(s^#e8A  
} q[l!kC+Eh  
\,<5U F0  
void CCaptureDlg::SaveBmp() zJnF#G  
{ 0v%ZKvSID  
 CDC dc; EgAM,\  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); W0 n/B &C  
 CBitmap bm; s2-`}LL  
 int Width=GetSystemMetrics(SM_CXSCREEN); VKW9Rn9Qg  
 int Height=GetSystemMetrics(SM_CYSCREEN); wb@TYvDt  
 bm.CreateCompatibleBitmap(&dc,Width,Height); czMThm  
 CDC tdc; ou;E@`h;x  
 tdc.CreateCompatibleDC(&dc); n>d@}hyv  
 CBitmap*pOld=tdc.SelectObject(&bm); mM| 313  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3snr-)   
 tdc.SelectObject(pOld); %?gh;? GD  
 BITMAP btm; *Uvh;d{  
 bm.GetBitmap(&btm); x>5"7MR`  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /&g5f4[|p  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *~~&*&+  
 BITMAPINFOHEADER bih; 2R:I23[#B  
 bih.biBitCount=btm.bmBitsPixel; > YHwWf-  
 bih.biClrImportant=0; O s*B%,}  
 bih.biClrUsed=0; h rL_. 4  
 bih.biCompression=0; 8lAs~c  
 bih.biHeight=btm.bmHeight; gOkq>i_  
 bih.biPlanes=1; jmgU'w-s  
 bih.biSize=sizeof(BITMAPINFOHEADER); {\!_S+}{  
 bih.biSizeImage=size; 3urL*Fw,  
 bih.biWidth=btm.bmWidth; %:bTOw[4r  
 bih.biXPelsPerMeter=0; U$; FOl  
 bih.biYPelsPerMeter=0; AV"fOK;#A  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); v%_5!SR  
 static int filecount=0; 0/7y&-/(  
 CString name; zJE$sB.f  
 name.Format("pict%04d.bmp",filecount++); Bvke@|]kW  
 name=m_Path+name; Q{hXP*5  
 BITMAPFILEHEADER bfh; 1bW[RK;GE  
 bfh.bfReserved1=bfh.bfReserved2=0; =|)W#x9=  
 bfh.bfType=((WORD)('M'<< 8)|'B'); N# o" W  
 bfh.bfSize=54+size; %#!pAUP\&  
 bfh.bfOffBits=54; F9DY\EI  
 CFile bf;  >'>onAIL  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8cqH0{  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3l?D%E]P  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7Sc._G{[%  
  bf.WriteHuge(lpData,size); ~f/nq/8  
  bf.Close(); cVHv>nd#  
  nCount++; =.q Zgcg  
 } $is|B9B  
 GlobalFreePtr(lpData); m&EJ @,H  
 if(nCount==1) ';g]!XsY)  
  m_Number.Format("%d picture captured.",nCount); mK!73<p_  
 else . zM  
  m_Number.Format("%d pictures captured.",nCount); Ho3$T  
  UpdateData(FALSE); ;J"b%~Gn  
} 9|Z25_sS  
1 J3h_z6/  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Ok7i^-85  
{ i *W9 4  
 if(pMsg -> message == WM_KEYDOWN) 8*sZ/N.  
 { $O}:*.{(W  
  if(pMsg -> wParam == VK_ESCAPE) +b<q4W  
   return TRUE; kHj|:,'sV  
  if(pMsg -> wParam == VK_RETURN) =yn|.%b  
   return TRUE; ,uEi*s>  
 } vA(V.s`  
 return CDialog::PreTranslateMessage(pMsg); .8[Db1W  
} dl:uI5]  
EeW%5/;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4%h@K(iN  
{ P<AN`un  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ /RLeD  
  SaveBmp(); 2yYq/J  
  return FALSE; J(CqT/Au-  
} J|k~e,C  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ jOuz-1x,&  
 CMenu pop; 1aC ?*,e?  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); zLQplw`#  
 CMenu*pMenu=pop.GetSubMenu(0); F<'@T,LVc  
 pMenu->SetDefaultItem(ID_EXITICON); sq6|J])GgU  
 CPoint pt; TCW[;d  
 GetCursorPos(&pt); `(j}2X'[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Hu"?wZj  
 if(id==ID_EXITICON) 2Z3c`/k  
  DeleteIcon(); %]/O0#E3Kz  
 else if(id==ID_EXIT) &yFt@g]  
  OnCancel(); AL #w  
 return FALSE; DL&\iR  
} 9v_B$F$_T  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0E9LZOw4T  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /IDfGAE  
 AddIcon(); XWQp-H.  
 return res; joa|5v'  
} >L6V!  
#q`-"2"|  
void CCaptureDlg::AddIcon() sxq'uF(K  
{ $0[T=9q <+  
 NOTIFYICONDATA data; MjIp~?*  
 data.cbSize=sizeof(NOTIFYICONDATA); <a@'Pcsk  
 CString tip; ;U6z|O7L  
 tip.LoadString(IDS_ICONTIP); 1-.UkdZ}  
 data.hIcon=GetIcon(0); Vj^<V|=  
 data.hWnd=GetSafeHwnd(); AplXl=  
 strcpy(data.szTip,tip); vh8{*9+  
 data.uCallbackMessage=IDM_SHELL; Eeem y*U  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; mz\d>0F U.  
 data.uID=98; _KSYt32N  
 Shell_NotifyIcon(NIM_ADD,&data); N :E7rtT,M  
 ShowWindow(SW_HIDE); &r \pQ};  
 bTray=TRUE; VH3 j  
} `@MY}/ o.  
n GE3O#fv  
void CCaptureDlg::DeleteIcon() ht8%A 1|  
{ 8 Zy`Z  
 NOTIFYICONDATA data; b<UZD yN~  
 data.cbSize=sizeof(NOTIFYICONDATA); K * Tj;  
 data.hWnd=GetSafeHwnd(); `>^2MHF3LT  
 data.uID=98; X9^a:7(  
 Shell_NotifyIcon(NIM_DELETE,&data); W(N@`^  
 ShowWindow(SW_SHOW); ZJz6 {cY  
 SetForegroundWindow(); (;^VdiJ  
 ShowWindow(SW_SHOWNORMAL); )M5:aSRz  
 bTray=FALSE; kFPZ$8e  
} V!=1 !"}OG  
AhOvI {  
void CCaptureDlg::OnChange() g%1FTl  
{ rf.w}B;V;  
 RegisterHotkey(); HhfuHZ<  
} " $5J7  
;74hOHDS  
BOOL CCaptureDlg::RegisterHotkey() [eV!ho*r  
{ nKn,i$sO/.  
 UpdateData(); '+tU8Pb  
 UCHAR mask=0; {5}UP@h  
 UCHAR key=0; n,eO6X 4  
 if(m_bControl) 0*?~I;.2m$  
  mask|=4; sMh3IL9(*  
 if(m_bAlt) v@bs4E46e  
  mask|=2; Ql-RbM  
 if(m_bShift) T9enyYt%  
  mask|=1; "T4Z#t  
  key=Key_Table[m_Key.GetCurSel()];  S5RQ  
 if(bRegistered){ ?YR/'Vq97  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); X5kIM\  
  bRegistered=FALSE; XjpFJ#T*$A  
 } Q>s>@hw  
 cMask=mask; 1X\dH<B}  
 cKey=key; 6yZfV7I  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Cg NfqT0  
 return bRegistered; [bH5UTA  
} %h;~@-$  
Bfw]#"N`  
  四、小结 M|e Qds  
*RKYdwnb  
  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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