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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: TzM=LvA  
  'b[0ci:  
  一、实现方法 Vxh.<b6&'  
7+ XM3  
  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: gfo}I2"  
'sU)|W(3U  
#pragma data_seg("shareddata") &" h]y?Q  
HHOOK hHook =NULL; //钩子句柄 "mZ.V  
UINT nHookCount =0; //挂接的程序数目 ?R6`qe_F  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9 5 H?{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ,Y!zORv<7  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @ajM^L!O  
static int KeyCount =0; 9]$`)wZ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Y}.Ystem  
#pragma data_seg() PXEKV0y  
V5 MO}  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 6Rz[?-mkLO  
GGE[{Gb9  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: _#'9kx|)  
oR %agvc^^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =A n`D  
cKey,UCHAR cMask) NWKi ()nA%  
{ \Ph7(ik  
 BOOL bAdded=FALSE; C\Ayv)S #2  
 for(int index=0;index<MAX_KEY;index++){ W_<4WG  
  if(hCallWnd[index]==0){ iBvOJs  
   hCallWnd[index]=hWnd; arj$dAW  
   HotKey[index]=cKey; Q}P-$X+/ n  
   HotKeyMask[index]=cMask; ,sDr9h/'C3  
   bAdded=TRUE; ?q Xs-  
   KeyCount++; z="L4  
   break; $D_HZ"ytu  
  } D4Sh9:\  
 } s~$zWx@v  
 return bAdded; #IX&9 aFB}  
} MUcN C\`z  
//删除热键 7rIlTrG  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nW5K[/1D  
{ ]Oso#GYD  
 BOOL bRemoved=FALSE; B8~= RmWLl  
 for(int index=0;index<MAX_KEY;index++){ (@Zcx9  
  if(hCallWnd[index]==hWnd){ _01Px a2.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #s+Q{2s  
    hCallWnd[index]=NULL; %#k,6 ;m  
    HotKey[index]=0; |Fv?6qw+  
    HotKeyMask[index]=0; 2k+16/T  
    bRemoved=TRUE; r/AHJU3&eY  
    KeyCount--; }ND'0*#  
    break; ")M;+<c"l  
   } ;[Tyt[  
  } \ X$)vK  
 } {L9yhYw  
 return bRemoved; j>!sN`dBj  
} Kbas-</Si  
"DjU:*'  
`P.CNYR<J  
  DLL中的钩子函数如下: K^H>~`C=  
Z[} $n-V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) oVkr3K Z  
{ p>p'.#M  
 BOOL bProcessed=FALSE; gpAHC   
 if(HC_ACTION==nCode) s*JE)  
 { Qp!J:YV  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 &=zU611,  
   switch(wParam) X47Ol  
   {  3w'W~  
    case VK_MENU: mo9$NGM&}  
     MaskBits&=~ALTBIT; ;0j*>fb\q7  
     break; k/#>S*Ne  
    case VK_CONTROL: u(hC^T1  
     MaskBits&=~CTRLBIT; 263*: Y  
     break; btQet.  
    case VK_SHIFT: @^CG[:|  
     MaskBits&=~SHIFTBIT; {!=2<-Aq  
     break; ;3 UvkN  
    default: //judge the key and send message 3;y_mg  
     break; E@pFTvo  
   } F= i!d,S  
   for(int index=0;index<MAX_KEY;index++){ NI\H \#bJ  
    if(hCallWnd[index]==NULL) h{/ve`F>@  
     continue; x,1=D~L}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A&l7d0Z^j5  
    { RVP18ub.S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); z!CD6W1n  
     bProcessed=TRUE; -N z}DW>  
    } t w!.%_1^  
   } :t>Q:mX(N  
  } U;gp)=JNT  
  else if((lParam&0xc000ffff)==1){ //有键按下 4$Pr|gx  
   switch(wParam) #!d]PH746  
   { b-nYxd  
    case VK_MENU: QUp?i  
     MaskBits|=ALTBIT; *<k&#D"m  
     break; O+FBQiv  
    case VK_CONTROL: N84qcc  
     MaskBits|=CTRLBIT; {^wdJZ~QLK  
     break; rfTe  
    case VK_SHIFT: RbAt3k;y  
     MaskBits|=SHIFTBIT; J wFned#T  
     break; ':sTd^V  
    default: //judge the key and send message q?i Cc c  
     break; !4B_$6US  
   } o2}N=|&  
   for(int index=0;index<MAX_KEY;index++){ sR! +d:LJ4  
    if(hCallWnd[index]==NULL) Tc_do"uU  
     continue; 6ZksqdP8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :#SNpn=@  
    { \HG$V>2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); s##Ay{  
     bProcessed=TRUE; ^ LbGH<#J  
    } ohplj`X[21  
   } z8tl0gd%D  
  } ,'_( DJX  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 N 8}lt  
   for(int index=0;index<MAX_KEY;index++){ d h?dO`  
    if(hCallWnd[index]==NULL) kW(Kh0x  
     continue; A'~#9@l<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kaO{#i2-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); yoW> BX  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 5)*6V&  
   } -fPT}v  
  } e YDUon  
 } 2Oi'E  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); % $.vOFP9  
} ' =}pxyg  
X <FOn7qf  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: %,;gP.dh7  
h--45`cE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ucM.Ro=@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~o Fh>9u  
eP?~- #  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: +"Ub/[J{G1  
+!xu{2!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V4\56 0  
{ ^$}/|d(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) >KHp-|0pv  
 { G1p'p&x.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 qp@m&GH  
  SaveBmp(); EW9b*r7./  
  return FALSE; g? I!OG  
 } ifHU|0_=  
 …… //其它处理及默认处理 sW'6} ^Q  
} -%=RFgU4  
f?5A"-NS  
TZBVU&,{Z  
  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。 0V7 _n  
~4+8p9f  
  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。 NQ{-&#@/v  
-xTKdm D  
  二、编程步骤 f| =# q  
b-4dsz 'ai  
  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"; \*J.\f  
g@(4ujOT  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Qpw@MF2P  
l# BZzJ?~  
  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; nj"m^PmWo3  
_j>L4bT  
  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; h[,XemwX  
Oc~VHT  
  5、 添加代码,编译运行程序。 H\d;QN9Q;  
lfgtcR{l5  
三、程序代码 S2bexbp0o  
D@*|24y  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL [tz u;/  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) u ]SZ{[ e  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 90(UgK&Y  
#if _MSC_VER > 1000 V:8@)Hc=  
#pragma once jf8w7T  
#endif // _MSC_VER > 1000 kAt RY4p  
#ifndef __AFXWIN_H__ GqMB^Ad  
#error include 'stdafx.h' before including this file for PCH L^x5&CCwk  
#endif FXxN>\76.  
#include "resource.h" // main symbols UtPwWB_YV  
class CHookApp : public CWinApp SlT7L||Ww  
{ S<9gyW  
 public: hWm0$v 1p  
  CHookApp(); $i -zMa  
  // Overrides df yrn%^Ia  
  // ClassWizard generated virtual function overrides #XfT1  
  //{{AFX_VIRTUAL(CHookApp) Yq{jEatY{/  
 public: &rcdr+'  
  virtual BOOL InitInstance(); s4N,^_j  
  virtual int ExitInstance(); xlk5Gob*  
  //}}AFX_VIRTUAL ;8uHRcdQ  
  //{{AFX_MSG(CHookApp) A`g.[7  
  // NOTE - the ClassWizard will add and remove member functions here. -FaaFw:Z;A  
  // DO NOT EDIT what you see in these blocks of generated code ! :k\} I k  
  //}}AFX_MSG <oQ6ZX  
  DECLARE_MESSAGE_MAP() !x6IV25  
}; Wy!uRzbBv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 03C .Xh=!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z"]xdOre  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c{ 7<H  
BOOL InitHotkey(); !;jgzi?z  
BOOL UnInit(); 5Vm Eyb  
#endif 4NJVW+:2  
ePi Z  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. &D^e<j}RQ  
#include "stdafx.h" 8a?IC|~Pz  
#include "hook.h" i"< ZVw  
#include <windowsx.h> Pm~,Ky&Hl  
#ifdef _DEBUG 9V.+U7\w  
#define new DEBUG_NEW /K[]B]1NE  
#undef THIS_FILE d;<.;Od$`  
static char THIS_FILE[] = __FILE__; $.;iu2iyo  
#endif K(' 9l& A  
#define MAX_KEY 100 vWuyft*  
#define CTRLBIT 0x04 y]w )`}Ax  
#define ALTBIT 0x02 r<v_CFJ  
#define SHIFTBIT 0x01 $Q=$?>4U  
#pragma data_seg("shareddata") :ET x*c  
HHOOK hHook =NULL; 8pd&3G+  
UINT nHookCount =0; A_aO }oBX  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey fG3wc l~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT PMQb\%iE"  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey y>4p~  
static int KeyCount =0; 7WXiG0  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift $G)&J2zL  
#pragma data_seg() 75<el.'H  
HINSTANCE hins; NWeV>;lh9  
void VerifyWindow(); 5%'o%`?i  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) t&3 8@p  
//{{AFX_MSG_MAP(CHookApp) $4sA nu]  
// NOTE - the ClassWizard will add and remove mapping macros here. 80dSQ"y  
// DO NOT EDIT what you see in these blocks of generated code! w~ijD ^ g  
//}}AFX_MSG_MAP $f9 ,##/  
END_MESSAGE_MAP() ,=yOek}  
W%=Zdm rv  
CHookApp::CHookApp() "--/v. Cs  
{ C"(_mW{@  
 // TODO: add construction code here,  I.UjST  
 // Place all significant initialization in InitInstance 9#Z zE/  
} :J<Owh@  
8 qn{  
CHookApp theApp; g~eJ YS,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %s]U@Ku(a  
{ dP?nP(l  
 BOOL bProcessed=FALSE; nMLU-C!t  
 if(HC_ACTION==nCode) Sb^add0dT  
 { {n pOlV  
  if((lParam&0xc0000000)==0xc0000000){// Key up hZ%2?v`  
   switch(wParam) JATS6-Lz`  
   { .V7Y2!4TE  
    case VK_MENU: :vw0r`  
     MaskBits&=~ALTBIT; m9 ^m  
     break; U<K|jsFo  
    case VK_CONTROL: XC :;Rq'j  
     MaskBits&=~CTRLBIT; d~w}NK[(  
     break; hkkF1 h  
    case VK_SHIFT: \dC.%#  
     MaskBits&=~SHIFTBIT; 9zmD6G!}t  
     break; Pv^(Q ]  
    default: //judge the key and send message <yis  
     break; 4 `j,&=  
   } 6\%r6_.d  
   for(int index=0;index<MAX_KEY;index++){ B>ms`|q=l  
    if(hCallWnd[index]==NULL) xV"6d{+  
     continue; MX"A@p~H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %g!yccD9  
    { 9Ilfv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =PI^X\if88  
     bProcessed=TRUE; >hHJ:5y  
    } t `N ">c"  
   } >fW+AEt\JB  
  } JHnk%h0  
  else if((lParam&0xc000ffff)==1){ //Key down ' #;,oX~5  
   switch(wParam) [Od>NO,n+]  
   { vx({N?  
    case VK_MENU: d4b 9rtM  
     MaskBits|=ALTBIT; #9URVq,  
     break; 8XLxT(YFIs  
    case VK_CONTROL: Y:DNu9  
     MaskBits|=CTRLBIT; .CIbpV?T  
     break; 3L'en  
    case VK_SHIFT: >lUBt5gU  
     MaskBits|=SHIFTBIT; #|)JD@;Q  
     break; t-3v1cv"  
    default: //judge the key and send message yg]suU<z]  
     break; 53g8T+`\(  
   } >xhd[  
   for(int index=0;index<MAX_KEY;index++) dt`9RB$  
   { \] tq7  
    if(hCallWnd[index]==NULL) ykErt%k<n  
     continue; E geG,/-`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 23(B43zy  
    { ,-w-su=J_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $)kk8Q4+K  
     bProcessed=TRUE; jx^|2  
    } *+_fP|cv  
   } L,s|gt v  
  } QO1A976o  
  if(!bProcessed){ 6i*ArGA   
   for(int index=0;index<MAX_KEY;index++){ S3%.-)ib  
    if(hCallWnd[index]==NULL) .WN;TjEg!  
     continue; I!C(K^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) WLg6-@kxXs  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -o=P85 V  
   } ~9`^72  
  } r6gt9u:  
 } @m !9"QhC  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @&nx;K6h  
} 7I2a*4}  
m'G?0^Ft  
BOOL InitHotkey() N7RG5?  
{ &0;{lS[N:L  
 if(hHook!=NULL){ .{'Uvn  
  nHookCount++; <>&e/  
  return TRUE; J4Q)`Y\~  
 } T U"K#V&u  
 else ,d9%Ce.$2  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); qv ;1$  
  if(hHook!=NULL) ')1}#V/I  
   nHookCount++; r| 6S  
  return (hHook!=NULL); ?{ 8sT-Z-L  
} 1 $KLMW  
BOOL UnInit() 0-;DN:>  
{ "w:\@Jwu(  
 if(nHookCount>1){ |k['wqn"  
  nHookCount--; YoSo0fQA  
  return TRUE; !Vp,YN+yN  
 } X:xC>4]gG'  
 BOOL unhooked = UnhookWindowsHookEx(hHook); D7gX,e  
 if(unhooked==TRUE){ c Eh0Vh-]  
  nHookCount=0; .,d$%lN  
  hHook=NULL; ^a:vJ)WB7  
 } o2 T/IJP  
 return unhooked; 7Ap~7)z[  
} XNkQk0i;g&  
(dO'_s&M]/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) WwCK  K  
{ LX(iuf+l  
 BOOL bAdded=FALSE; 4z-,M7iP  
 for(int index=0;index<MAX_KEY;index++){ @'F8|I 6  
  if(hCallWnd[index]==0){ `a/PIc"  
   hCallWnd[index]=hWnd; WIH4Aw  
   HotKey[index]=cKey; fY,@2VxyfA  
   HotKeyMask[index]=cMask; OI]K_ m3  
   bAdded=TRUE; LS2ek*FJO  
   KeyCount++; 61s2bt#  
   break; ZH`K%h0  
  } *`S)@'@:(  
 } 4}r\E,`*X  
 return bAdded; K[Egwk7  
} buC m @@o  
"Dmw -  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vP87{J*DE1  
{ ]"2 v7)e  
 BOOL bRemoved=FALSE; 3-_U-:2"  
 for(int index=0;index<MAX_KEY;index++){ :xAe<Pq  
  if(hCallWnd[index]==hWnd){ Z)6nu)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ZB_16&2Ow  
    hCallWnd[index]=NULL; \^;|S  
    HotKey[index]=0; sBuq  
    HotKeyMask[index]=0; SG+i\yu$h0  
    bRemoved=TRUE; 2=!3[> B  
    KeyCount--; 0c\|S>g [  
    break; !mErt2UJl  
   } YjIED,eRv  
  } :y O,  
 } ==e#CSJq  
 return bRemoved; X,JWLS J  
} 0,L$x*Nj5  
g qJEJ~  
void VerifyWindow() Cr V2 V)|G  
{ ~\@<8@N2a6  
 for(int i=0;i<MAX_KEY;i++){ :}3qZX  
  if(hCallWnd!=NULL){ UVoLHd  
   if(!IsWindow(hCallWnd)){ kb}]sj  
    hCallWnd=NULL; 2XecP'+m  
    HotKey=0; <p L;-  
    HotKeyMask=0; J.1ln = Y  
    KeyCount--; VT.{[Kl  
   } qeK  
  } tE9_dR^K  
 } :zn ?<(sQ  
} %9 -#`  
@cTZ`bg  
BOOL CHookApp::InitInstance() .^N#|hp^  
{ 8)q]^  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); yZ(Nv $[5  
 hins=AfxGetInstanceHandle(); yK>0[6l  
 InitHotkey(); q:~`7I  
 return CWinApp::InitInstance(); +{Vwz  
} I$6 f.W  
:9rhv{6Wp  
int CHookApp::ExitInstance() ubN"(F:!-S  
{ ?C>VB+X}y  
 VerifyWindow(); Zh~Lm  
 UnInit(); T>uWf#&pjs  
 return CWinApp::ExitInstance(); &"j).Ogm4  
} G}?P r4Gj  
,C@hTOT  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file GFc  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Mp=kZs/  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ s=%+o& B  
#if _MSC_VER > 1000 XdIVMXLL\  
#pragma once ^s(X VVA  
#endif // _MSC_VER > 1000 B 1ZHV^  
4M<JfD  
class CCaptureDlg : public CDialog m|cWX"#g  
{ b\|p  
 // Construction "/K&qj  
 public: w<F;&' ;@h  
  BOOL bTray; )zLS,/pk^  
  BOOL bRegistered; f w>Gx9  
  BOOL RegisterHotkey(); M_.,c Vk  
  UCHAR cKey; }$k`[ivBx(  
  UCHAR cMask; eze(>0\f  
  void DeleteIcon(); fe9& V2Uu  
  void AddIcon(); luz%FY:  
  UINT nCount; [|;Zxb:  
  void SaveBmp(); ':R3._tw\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor k\thEEVP0*  
  // Dialog Data /&!d  
  //{{AFX_DATA(CCaptureDlg) }vxH)U6$q  
  enum { IDD = IDD_CAPTURE_DIALOG }; ~ :b:_ 5"  
  CComboBox m_Key; % x*Ec[l  
  BOOL m_bControl; 7pI \`*7b  
  BOOL m_bAlt; _d=&9d#=\  
  BOOL m_bShift; eN?P) ,  
  CString m_Path; 'hi\98y  
  CString m_Number; Lvj5<4h;  
  //}}AFX_DATA Q3O .<9S  
  // ClassWizard generated virtual function overrides Rd1ku=  
  //{{AFX_VIRTUAL(CCaptureDlg) w3bH|VnU8;  
 public: 0|>  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @G$<6CG\  
 protected: eP)YJe 3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dVG UhXN6  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); S{)n0/_  
  //}}AFX_VIRTUAL ?nSp?m;  
  // Implementation '%RK KA  
 protected: #`L}.  
  HICON m_hIcon; UoS;!}l  
  // Generated message map functions sv6U%qV  
  //{{AFX_MSG(CCaptureDlg) ;pyJ O_R[  
  virtual BOOL OnInitDialog(); (cA|N0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); <^q"31f  
  afx_msg void OnPaint(); j}.J$RtW1f  
  afx_msg HCURSOR OnQueryDragIcon(); pBnf^Ew1  
  virtual void OnCancel(); 95 .'t}  
  afx_msg void OnAbout(); = hX-jP  
  afx_msg void OnBrowse(); tc2GI6]e'  
  afx_msg void OnChange(); |QTqa~~B  
 //}}AFX_MSG KeHE\Fq^V  
 DECLARE_MESSAGE_MAP() v4##(~Tu  
}; m'"VuH?^  
#endif r~fl=2>yQ  
O*/-I pM  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Lz{T8yvZ  
#include "stdafx.h" @#Uiy5N  
#include "Capture.h" E1ob+h:`d  
#include "CaptureDlg.h" Ci9wF (<k  
#include <windowsx.h> &r5%WRzpYT  
#pragma comment(lib,"hook.lib") *]{I\rX  
#ifdef _DEBUG d?y\~<  
#define new DEBUG_NEW [K@!JY  
#undef THIS_FILE 4x?u5L 9o  
static char THIS_FILE[] = __FILE__; ?!j/wV_H  
#endif x  Bw.M{  
#define IDM_SHELL WM_USER+1 "_@+/Iy.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bK;a V&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P(nHXVSUE  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 0Ilvr]1a4  
class CAboutDlg : public CDialog 35kbE'  
{ OSi9J.]O  
 public: ]%8;c  
  CAboutDlg(); ;U3Vows  
  // Dialog Data *"sDaN0@R  
  //{{AFX_DATA(CAboutDlg) ,vw`YKg  
  enum { IDD = IDD_ABOUTBOX }; tUF]f6  
  //}}AFX_DATA Zw 8b -_  
  // ClassWizard generated virtual function overrides bK%tQeT  
  //{{AFX_VIRTUAL(CAboutDlg) KBHKcFk  
 protected:  /r@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support YgOgYo{E!  
  //}}AFX_VIRTUAL L=!kDU  
  // Implementation QGG(I7{-  
 protected: 3CuoB b8  
  //{{AFX_MSG(CAboutDlg) @wJa33QT  
  //}}AFX_MSG #|h8u`  
  DECLARE_MESSAGE_MAP() pdqa)>$  
}; aMg f6veM  
IMrOPwjc  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) [y;ZbfMP|o  
{ :!15>ML;-  
 //{{AFX_DATA_INIT(CAboutDlg) vm}.gQ  
 //}}AFX_DATA_INIT i1@gHk  
} 6v)eM=   
U I|@5:J  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) TEZqAR]G  
{ <%uZwk>#  
 CDialog::DoDataExchange(pDX); 0MGK3o)  
 //{{AFX_DATA_MAP(CAboutDlg) &-Er n/[  
 //}}AFX_DATA_MAP luog_;{h+  
} S9+gVR8]C  
}mZ*f y0t  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ,?~,"IQyi[  
 //{{AFX_MSG_MAP(CAboutDlg) ^@"f%3  
 // No message handlers @5GP;3T  
 //}}AFX_MSG_MAP t1s@Ub5);I  
END_MESSAGE_MAP() %t.IxMY  
6.=1k  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) jF85bb$  
: CDialog(CCaptureDlg::IDD, pParent) 5z]KkPQ  
{ |noTIAI  
 //{{AFX_DATA_INIT(CCaptureDlg) $:Z xb  
  m_bControl = FALSE; oYx f((x  
  m_bAlt = FALSE; 98nLj9  
  m_bShift = FALSE; Q_Sq  uuk  
  m_Path = _T("c:\\"); UpBYL?+L  
  m_Number = _T("0 picture captured."); RVy87_J1  
  nCount=0; >&Lu0oHH  
  bRegistered=FALSE; iPNs EQ0We  
  bTray=FALSE; gipRVd*TA  
 //}}AFX_DATA_INIT SYLkC [0 k  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 w*@Z-'(j  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Z9bPj8d  
} S]@iS[|?  
.sMi"gg  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~h|L;E"  
{ B%;+8]  
 CDialog::DoDataExchange(pDX); Yr0i9Qow  
 //{{AFX_DATA_MAP(CCaptureDlg) I65GUX#DV  
  DDX_Control(pDX, IDC_KEY, m_Key); f\w4F'^tj  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -bQvJ`iF  
  DDX_Check(pDX, IDC_ALT, m_bAlt); H}rP{`m  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); NO1]JpR  
  DDX_Text(pDX, IDC_PATH, m_Path); vbJMgdHFR  
  DDX_Text(pDX, IDC_NUMBER, m_Number); h0}-1kVT^  
 //}}AFX_DATA_MAP KJZY.7  
} _fw'c*j  
lR^Qm|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6 VDF@V$E  
//{{AFX_MSG_MAP(CCaptureDlg) 'o9V0#$!  
 ON_WM_SYSCOMMAND() Y :BrAa[  
 ON_WM_PAINT() 24l9/v'  
 ON_WM_QUERYDRAGICON() K*RRbtb  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) hUc |Xm  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ?"Q6;np*  
 ON_BN_CLICKED(ID_CHANGE, OnChange) c~;.m<yrf  
//}}AFX_MSG_MAP \LXNdE2B  
END_MESSAGE_MAP() H[U*' 2TJ  
|REU7?B  
BOOL CCaptureDlg::OnInitDialog() 3E:<  
{ Vdyx74xX  
 CDialog::OnInitDialog(); H-lRgJdc  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); B)*%d7=x  
 ASSERT(IDM_ABOUTBOX < 0xF000); LnIJ wD  
 CMenu* pSysMenu = GetSystemMenu(FALSE); X / "H+l  
 if (pSysMenu != NULL) W0hLh<Go  
 { Rv o<ISp  
  CString strAboutMenu; 8yl /!O,v  
  strAboutMenu.LoadString(IDS_ABOUTBOX); tJ3s#q6  
  if (!strAboutMenu.IsEmpty()) 2Z |kf9  
  { |3@]5f&  
   pSysMenu->AppendMenu(MF_SEPARATOR); 'KG`{K$  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]ORat.*0[T  
  } 7G2N&v>  
 } ZrBxEf$f  
 SetIcon(m_hIcon, TRUE); // Set big icon % VZ\4+8S  
 SetIcon(m_hIcon, FALSE); // Set small icon >48Y-w  
 m_Key.SetCurSel(0); ><^@1z.J  
 RegisterHotkey(); ](pD<FfS]'  
 CMenu* pMenu=GetSystemMenu(FALSE); -n-X/M  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); E ..[F<5  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); g`8|jg0]`I  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); SNFz#*  
 return TRUE; // return TRUE unless you set the focus to a control beoMLHp  
} so?1lG  
}o.ZCACYg  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) c:5BQr '  
{ ]T`qPIf;yJ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Z O^ +KE"  
 { #^Y-*vf2  
  CAboutDlg dlgAbout; @"0qS:s]X  
  dlgAbout.DoModal(); aleIy}"  
 } 2{\Y<%.  
 else }_x oT9HUr  
 { 8%B @[YDe  
  CDialog::OnSysCommand(nID, lParam); t~`Ef  
 } ( d.i np(  
} >6j`ZWab>  
zQJbZ=5Bu"  
void CCaptureDlg::OnPaint() b%F*Nr  
{ x&wUPo{  
 if (IsIconic()) d=XhOC$  
 { |@nXlZE  
  CPaintDC dc(this); // device context for painting z=sqO'~  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ufOaD7  
  // Center icon in client rectangle <j' #mUzd  
  int cxIcon = GetSystemMetrics(SM_CXICON); `P~RG.HO  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2UquN0  
  CRect rect; BHYEd}M  
  GetClientRect(&rect); 2o;M:+KQ)  
  int x = (rect.Width() - cxIcon + 1) / 2; +tF,E^  
  int y = (rect.Height() - cyIcon + 1) / 2; .^,vK7  
  // Draw the icon z?^p(UH  
  dc.DrawIcon(x, y, m_hIcon); %/y/,yd  
 } AJ /_l;  
 else }PJ:9<G y  
 { VTdZ&%@  
  CDialog::OnPaint(); ?{V[bm  
 } |r%P.f:y{X  
} ~ +Y;jA dU  
qeYr=%)c  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1/HZY0em  
{ ZmDr$iU~  
 return (HCURSOR) m_hIcon; f!yxS?j3  
} !p2&$s"N.  
w_ m  
void CCaptureDlg::OnCancel() (g\'Zw5bk  
{ 0IK']C  
 if(bTray) +?p ;,Z%5  
  DeleteIcon(); W0|?R6|  
  CDialog::OnCancel(); T+fU +GLD  
} ~zx-'sc?  
d?>sy\{2  
void CCaptureDlg::OnAbout() 1<F/boF~  
{ lF<(yF5  
 CAboutDlg dlg; ^]kDYhe*Y  
 dlg.DoModal(); +^.(3Aw  
} q0}LfXql8  
LYKepk  
void CCaptureDlg::OnBrowse() sf LBi~*j  
{ UcZ3v]$I  
 CString str; 'D bHXS7N  
 BROWSEINFO bi; V}*b^<2o 5  
 char name[MAX_PATH]; K;K tx>Z/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Hd:ZE::Q'#  
 bi.hwndOwner=GetSafeHwnd(); "6ZatRUd  
 bi.pszDisplayName=name; wR KGJ  
 bi.lpszTitle="Select folder"; +W}f0@#)<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; l\eq/yg_  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1/z1~:Il  
 if(idl==NULL) SE\`JGA[  
  return; 0y(d|;':  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); O/-xkzR*  
 str.ReleaseBuffer(); Y#G '[N>  
 m_Path=str; Vj_ $%0  
 if(str.GetAt(str.GetLength()-1)!='\\') Uhf -}Jdw  
  m_Path+="\\"; c{[d@jt O  
 UpdateData(FALSE); pq@ad\8  
} opBv x>S  
Gr_I/+<  
void CCaptureDlg::SaveBmp() Wrlmo'31  
{ 3wK)vW  
 CDC dc; i9\Pks#l%  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); e2;"> tp6?  
 CBitmap bm; (\G~S 4  
 int Width=GetSystemMetrics(SM_CXSCREEN); vi'K|[!?  
 int Height=GetSystemMetrics(SM_CYSCREEN); r6A7}v  
 bm.CreateCompatibleBitmap(&dc,Width,Height); UuN(+&oD-  
 CDC tdc; umi#Se3&  
 tdc.CreateCompatibleDC(&dc); J[9jNCq|  
 CBitmap*pOld=tdc.SelectObject(&bm); OAv/P|n=  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); N%0Z> G  
 tdc.SelectObject(pOld); niFjsTA.Z  
 BITMAP btm; 0Y\u,\GrxW  
 bm.GetBitmap(&btm); .w0?  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; DQ,QyV  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Y$N|p{Z  
 BITMAPINFOHEADER bih; 9:P)@UF  
 bih.biBitCount=btm.bmBitsPixel; 6ik6JL$AI  
 bih.biClrImportant=0;  9TeDLp  
 bih.biClrUsed=0; !nu#r$K(  
 bih.biCompression=0; '  _N >  
 bih.biHeight=btm.bmHeight; )/BKN`,  
 bih.biPlanes=1; 1vobfZ-w9  
 bih.biSize=sizeof(BITMAPINFOHEADER); Y }0-&  
 bih.biSizeImage=size; /%.K`BMN  
 bih.biWidth=btm.bmWidth; Y.-i;Mmu  
 bih.biXPelsPerMeter=0; c;j]/R$i  
 bih.biYPelsPerMeter=0; [ML4<Eb+ x  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?)9 6YX'  
 static int filecount=0; Dj[D|%9a  
 CString name; M+Dkn3bx  
 name.Format("pict%04d.bmp",filecount++); mCg5-E~;  
 name=m_Path+name; $XJe)  
 BITMAPFILEHEADER bfh; |/q*Fg[f  
 bfh.bfReserved1=bfh.bfReserved2=0; tJ 6:$dh  
 bfh.bfType=((WORD)('M'<< 8)|'B'); fd(>[RP?  
 bfh.bfSize=54+size; *? c~7ru  
 bfh.bfOffBits=54; zj8;ENhEI  
 CFile bf; Y yI|^f8C  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ BKN]DxJ6  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); %bddR;c  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &vLZj  
  bf.WriteHuge(lpData,size); Jg7IGU(dct  
  bf.Close(); ,Qp58u2V  
  nCount++; nwz}&nR  
 } 1 }:k w  
 GlobalFreePtr(lpData); hj-M #a  
 if(nCount==1) E;%{hAD{  
  m_Number.Format("%d picture captured.",nCount); 0O[q6!&]  
 else #u#s'W  
  m_Number.Format("%d pictures captured.",nCount); Nz2}Ma 2  
  UpdateData(FALSE); F7mzBrz  
} r&^4L  
~=}56yxl[  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) '?#e$<uS-  
{ 2f4*r^  
 if(pMsg -> message == WM_KEYDOWN) >b/Yg:t  
 { !]W6i]p  
  if(pMsg -> wParam == VK_ESCAPE) (!;4Y82#  
   return TRUE; wj Y3:S~  
  if(pMsg -> wParam == VK_RETURN) <;= X7l+  
   return TRUE; X\M0Q%8  
 } J`\%'pEn  
 return CDialog::PreTranslateMessage(pMsg); B~z& "`  
} eE1w<] Eg  
*#~3\{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) anv_I=  
{ a "8/y4Y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ o6'`W2P  
  SaveBmp(); GAQVeL1  
  return FALSE; ~bg FU  
} R9{6$djq\:  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ E-l>z%  
 CMenu pop; U%2pbGU  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^M8\ 3G  
 CMenu*pMenu=pop.GetSubMenu(0); Jzh_`jW0l  
 pMenu->SetDefaultItem(ID_EXITICON); 89~)nV)  
 CPoint pt; ?9/%K45  
 GetCursorPos(&pt); V[CS{Hy'  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {DAwkJvb]  
 if(id==ID_EXITICON) Z#d_<e?  
  DeleteIcon(); m/CA  
 else if(id==ID_EXIT) GQT|T0>Ro  
  OnCancel(); ,>e)8  
 return FALSE; i_I`Y  
} c}$?k@=  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); z;1yZ4[G  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =U2`]50  
 AddIcon(); /Eu[7  
 return res; `}s)0 /}6  
} u6|P)8?`  
PJO +@+"{@  
void CCaptureDlg::AddIcon() `[[ A 7  
{ pM.>u/=X  
 NOTIFYICONDATA data; H2[ S]`?  
 data.cbSize=sizeof(NOTIFYICONDATA); =p ^Sn,t  
 CString tip; =f?|f  
 tip.LoadString(IDS_ICONTIP); u:<%!?  
 data.hIcon=GetIcon(0); lfb]xu]O  
 data.hWnd=GetSafeHwnd(); 'lg6<M%#[  
 strcpy(data.szTip,tip); 8q}`4wCD$  
 data.uCallbackMessage=IDM_SHELL; <{:$ ]3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; & Z*&&  
 data.uID=98; , En D3 |  
 Shell_NotifyIcon(NIM_ADD,&data); {-tCLkE 3  
 ShowWindow(SW_HIDE); |G!-FmIK  
 bTray=TRUE; L~CwL  
} |Kh#\d  
e*=N\$  
void CCaptureDlg::DeleteIcon() 7hY~  
{ e&#qj^  
 NOTIFYICONDATA data; `TBau:ElI  
 data.cbSize=sizeof(NOTIFYICONDATA); LQ373 j-  
 data.hWnd=GetSafeHwnd(); cC b'z1  
 data.uID=98; P]1`=-  
 Shell_NotifyIcon(NIM_DELETE,&data); 02SFFqm  
 ShowWindow(SW_SHOW); $D<LND=o=  
 SetForegroundWindow(); JM@MNS_||(  
 ShowWindow(SW_SHOWNORMAL); mQ:lj$Gf  
 bTray=FALSE; j8_WEjG  
} U2\zl  
gVEW*8  
void CCaptureDlg::OnChange() Gd%KBb  
{ 9!}&&]Q`  
 RegisterHotkey(); r^q@rL>   
} ]FL=E3U  
3I@j=:(%Y  
BOOL CCaptureDlg::RegisterHotkey() {H=DeQ  
{ l0l2fwz(  
 UpdateData(); X70G@-w  
 UCHAR mask=0; aU4v-9@U8  
 UCHAR key=0; 2y`rS _2  
 if(m_bControl) lt`#or"o  
  mask|=4; BMgiXdv.B  
 if(m_bAlt) *&^`Uk,[  
  mask|=2; $x)C_WZj?  
 if(m_bShift) v=RQ"iv8  
  mask|=1; [2WJ>2r}6  
  key=Key_Table[m_Key.GetCurSel()]; uwU;glT  
 if(bRegistered){ /:~mRf^  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); _r^Cu.[7  
  bRegistered=FALSE; y?zNxk/p  
 } :?O+EE  
 cMask=mask; 2aNCcZw0  
 cKey=key; 37Q9goMov  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Z4b<$t[u  
 return bRegistered; #"jEc*&=  
} ckHHD|  
h}nceH0s3d  
  四、小结 mhv{6v  
2zZ" }Zr#  
  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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