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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: .5KRi6  
  Xk(c2s&  
  一、实现方法 C03ehjT<  
@j5W4HU  
  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: 552c4h/T  
EJb"/oLla  
#pragma data_seg("shareddata") x_bS-B)%Y:  
HHOOK hHook =NULL; //钩子句柄 D3(|bSca  
UINT nHookCount =0; //挂接的程序数目 pbR84g^p.S  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $PHKI B(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 o&fAnpia=  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 76mQ$ze  
static int KeyCount =0; ^e<0-uM" s  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 WLv( K_3Y  
#pragma data_seg() %+Mi~k*A'  
^nFa'=  
  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。 iV(B0z  
Qh%7RGh_  
  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: ?fCLiK  
u5$\E]+ _  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR q8P| ]  
cKey,UCHAR cMask) =n i&*&  
{ 6>SP5|GG  
 BOOL bAdded=FALSE; lmQ!q>N  
 for(int index=0;index<MAX_KEY;index++){   VG q'  
  if(hCallWnd[index]==0){ ]^/:Xsk$  
   hCallWnd[index]=hWnd; E/Eny 5  
   HotKey[index]=cKey; >bEH&7+@_'  
   HotKeyMask[index]=cMask; 2 os&d|  
   bAdded=TRUE; I6{}S6  
   KeyCount++; EX=+TOkAf  
   break; =p N?h<dc  
  } P[% W[E<  
 } .e"De-u  
 return bAdded; b4S7 Q"g  
} ) m%ghpX  
//删除热键 u}qfwVX Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) DIkD6n?V  
{ Xe:B*  
 BOOL bRemoved=FALSE; nBWrkVX  
 for(int index=0;index<MAX_KEY;index++){ 4US8B=jk  
  if(hCallWnd[index]==hWnd){ V0c*M>V  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3)EslBA7i  
    hCallWnd[index]=NULL; v^HDR 3I  
    HotKey[index]=0; = 14'R4:  
    HotKeyMask[index]=0; ]J5[ZVz  
    bRemoved=TRUE; it D%sKo  
    KeyCount--; {~[H"h537t  
    break; KFCuv15w,3  
   } "|.>pD#0&  
  } f|w+}z  
 } .A&Ey5  
 return bRemoved; +2|X 7wA  
} >"5^]o2?~l  
NnGQ=$e  
KaBze67<|  
  DLL中的钩子函数如下: J &u&G7#S  
 ]i=-/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2fFNJ  
{ Q^b_+M  
 BOOL bProcessed=FALSE; R]m`v: 9  
 if(HC_ACTION==nCode) !M)!  
 { 0r_8/|N#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /^P^K  
   switch(wParam) MS_&;2  
   {  X+?*Tw!\  
    case VK_MENU: 4 (bV#   
     MaskBits&=~ALTBIT; F, %qG,  
     break; :_p3nb[r  
    case VK_CONTROL: `a3q)}*Y  
     MaskBits&=~CTRLBIT; 3k5Mty  
     break; bxqXFy/I  
    case VK_SHIFT: HI,1~ Jw+  
     MaskBits&=~SHIFTBIT; <E&1HeP  
     break; +}I[l,,xy  
    default: //judge the key and send message h" P4  
     break; j/ #kO?  
   } I&q:w\\z8|  
   for(int index=0;index<MAX_KEY;index++){ *~lD;{2  
    if(hCallWnd[index]==NULL) 1LJ ?Ka[_*  
     continue; V4l`Alr\L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) G>YJ3p7  
    { DSizr4R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;6e#W!  
     bProcessed=TRUE; )j',e $m  
    } gupB8 .!  
   } gTH1FR8$y  
  } 1AjsAi,7;2  
  else if((lParam&0xc000ffff)==1){ //有键按下 l:z :tJ#(  
   switch(wParam) C ])Q#!D|  
   { e ! 6SJ7xC  
    case VK_MENU: dY;^JPT  
     MaskBits|=ALTBIT; `[jQn;  
     break; $io-<Z#Q  
    case VK_CONTROL: TEh]-x`  
     MaskBits|=CTRLBIT; LCyci1\@  
     break; \&&kUpI  
    case VK_SHIFT: 23_<u]V  
     MaskBits|=SHIFTBIT; c^6v7wT5  
     break; e,Gv~ae9  
    default: //judge the key and send message G"5Nj3v d  
     break; 6@]Xwq  
   } 8v*>~E/0  
   for(int index=0;index<MAX_KEY;index++){ >#$( M5&}-  
    if(hCallWnd[index]==NULL) fh b&_T  
     continue; p<Ah50!B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p27A#Uu2}  
    { ^t*+hFEI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C$"jZcm,I  
     bProcessed=TRUE; v|?hc'Fj  
    } Ke&lGf"5  
   } mB"zyL-  
  } 2^ ^;Q:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 2GqPS  
   for(int index=0;index<MAX_KEY;index++){ 28f-8B  
    if(hCallWnd[index]==NULL) 5caYA&R  
     continue; N>/*)Frt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [YHvyfk~_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); zv@'x nY]  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ojs&W]r0Z  
   } i\3BA"ZX  
  } -102W{V/T  
 } <^~Xnstl  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); j+Y4>fL$  
} Gqk"%irZ  
HAf.LdnzS  
  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: ![7v_l\Q  
U"%k4]:A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); htX'bA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); CBnD)1b\  
6KnD(im  
  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: Ook3B  
fX[,yc;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >, 234ab=d  
{ )@]-bPnv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) }sPY+ZjV  
 { :`:<JA3,  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @!0j)5%  
  SaveBmp(); >h[tHM O  
  return FALSE; 7/PHg)&  
 } %f6l"~y  
 …… //其它处理及默认处理 w?jmi~6  
} xXA$16kd  
XhWMvme  
l]sO[`X  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 4=o3 ZRV  
(pi7TSJ  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 {)4Vv`n  
F#X\}MvEU  
  二、编程步骤 L9Fx Lw41  
"'t<R}t!A  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; p\+#`] Q7}  
/D1Bf:'(  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; gW/H#T,  
,=$yvZs4[]  
  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; _\@i&3hkx  
&U4]hawbOU  
  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; <Cg;l<$`b  
]DmqhK`  
  5、 添加代码,编译运行程序。 Qbl6~>T  
W.MJyem  
三、程序代码 g+ 2SB5 2D  
RVI],O  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL :&?#~NFH  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) D1o 8Wo  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ni2H~{]z  
#if _MSC_VER > 1000 82O`<Ci  
#pragma once ~gI%   
#endif // _MSC_VER > 1000 w2+RX-6Ie  
#ifndef __AFXWIN_H__ gvoK  
#error include 'stdafx.h' before including this file for PCH <RGRvv  
#endif DOhXb  
#include "resource.h" // main symbols !PUhdW  
class CHookApp : public CWinApp )z/j5tnvm  
{ +S;8=lzuV  
 public: s3J T1TX  
  CHookApp(); d57(#)`  
  // Overrides m G?a)P  
  // ClassWizard generated virtual function overrides KOi%zE%  
  //{{AFX_VIRTUAL(CHookApp) {dMa&r|lp  
 public: elKQge  
  virtual BOOL InitInstance(); nJ*NI)  
  virtual int ExitInstance(); /jj!DO#  
  //}}AFX_VIRTUAL _x UhDu%  
  //{{AFX_MSG(CHookApp) ]"/ *7NM  
  // NOTE - the ClassWizard will add and remove member functions here. ,l0s(Cg  
  // DO NOT EDIT what you see in these blocks of generated code ! Q=^}B}G  
  //}}AFX_MSG ya:H{#%6  
  DECLARE_MESSAGE_MAP() l' "<  
}; fi bR:8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); HowlJ[km%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tCc}}2bC&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h$ZF[Xbfe  
BOOL InitHotkey(); _^P>@ ^  
BOOL UnInit(); dcHkb,HsO  
#endif >$R-:>~zN  
jDXmre?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4?%0z) g  
#include "stdafx.h" tmb0zuJ&C!  
#include "hook.h" da I-*  
#include <windowsx.h> $<ZX};/D  
#ifdef _DEBUG ~gBqkZ# y?  
#define new DEBUG_NEW wV5<sH__  
#undef THIS_FILE _I$]L8hC  
static char THIS_FILE[] = __FILE__; <7 PtC,74  
#endif A)`M*(~  
#define MAX_KEY 100 l@j!j]nE  
#define CTRLBIT 0x04 k?J}-+Bm[|  
#define ALTBIT 0x02 @F3d9t-  
#define SHIFTBIT 0x01 .S?,%4v%%  
#pragma data_seg("shareddata") |?g2k:fzB7  
HHOOK hHook =NULL; mY`b|cS3p$  
UINT nHookCount =0; &Q&$J )0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey )9<)mV*EB(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ImF/RKI~ "  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~)ByARao=  
static int KeyCount =0; [Xz7.<0#U  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Mm/GI a  
#pragma data_seg() O$&p<~  
HINSTANCE hins; n"dT^ g  
void VerifyWindow(); ,9A[o`b  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) PMrvUM62  
//{{AFX_MSG_MAP(CHookApp) Nm; ka&'  
// NOTE - the ClassWizard will add and remove mapping macros here. v WhtClJ3  
// DO NOT EDIT what you see in these blocks of generated code! {?m',sG;&  
//}}AFX_MSG_MAP 5@v!wms  
END_MESSAGE_MAP() *S=v1 s/  
}'@*Olj  
CHookApp::CHookApp() ~?L. n:wu  
{ el[6E0!@  
 // TODO: add construction code here, w\@Anwj#L  
 // Place all significant initialization in InitInstance nZ%<2  
} $}\. )^[}  
l|uN-{ w  
CHookApp theApp; kXOlZ C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) SQz>e  
{ ?ii a  
 BOOL bProcessed=FALSE; S8]g'!  
 if(HC_ACTION==nCode) :^ cA\2=  
 { %*s[s0$c  
  if((lParam&0xc0000000)==0xc0000000){// Key up "arbUX~d  
   switch(wParam) gqC:r,a  
   { `q5*VqIhs  
    case VK_MENU: HX=`kkX  
     MaskBits&=~ALTBIT; _C*}14 "3  
     break; >G-D& A+  
    case VK_CONTROL: h,#AY[Q  
     MaskBits&=~CTRLBIT; ,YiBu^E9  
     break; ;XTP^W!6f  
    case VK_SHIFT: Af -{'  
     MaskBits&=~SHIFTBIT; 6~2!ZU  
     break; $Z;0/\r%  
    default: //judge the key and send message H7\EvIM=  
     break; ;ga~ae=Fg  
   } RWoa'lnu  
   for(int index=0;index<MAX_KEY;index++){ C"F(kgL  
    if(hCallWnd[index]==NULL) 8<g5.$xyz  
     continue; 2smLv1w@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) : 0%V:B  
    { U,+=>ns>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \?GMtM,  
     bProcessed=TRUE; zb9$  
    } 7%?A0%>6G  
   } R"82=">v  
  } RQh4RUm  
  else if((lParam&0xc000ffff)==1){ //Key down K}wUM^  
   switch(wParam) A46y?"]/30  
   { \ (X~Z  
    case VK_MENU: Tlf G"HzZ%  
     MaskBits|=ALTBIT; 43(+3$VM7  
     break; N}^\$sVu_  
    case VK_CONTROL: G,$jU9 f  
     MaskBits|=CTRLBIT; C"YM"9JSJ  
     break; .IG(Y!cB  
    case VK_SHIFT: "4ovMan  
     MaskBits|=SHIFTBIT; N 2x\O~7  
     break; |#MA?oz3T  
    default: //judge the key and send message JM!o(zbt  
     break; EmH2 Dbw  
   } \6sp"KqP  
   for(int index=0;index<MAX_KEY;index++) eR;cl$  
   { RE*SdazY?  
    if(hCallWnd[index]==NULL) /gPn2e;  
     continue; 3 D+dM0wM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jLZ~9FXF2  
    { \a}%/_M\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ffSecoX  
     bProcessed=TRUE; !rwv~9I  
    } //AS44^IS  
   } QRa>W/N  
  } !qy/'v4  
  if(!bProcessed){ 7 bpV=  
   for(int index=0;index<MAX_KEY;index++){ :.Np7[~{  
    if(hCallWnd[index]==NULL) 'KXvn0  
     continue; ,!Q2^R   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) CM~)\prks  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0A|.ch  
   } Cj ykM])  
  } 1'}~;?_  
 } d7l0;yR&+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); jMZ{>l.v  
} r0hu?3u1?  
xy[R9_V  
BOOL InitHotkey() #,$d!l @  
{ 4egq Y0A  
 if(hHook!=NULL){ & XcY|y=W  
  nHookCount++; mNs&*h}  
  return TRUE; >D*L0snjV  
 } L%N|8P[  
 else \/'u(|G  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 72Ft?;R  
  if(hHook!=NULL) N0/DPZX7  
   nHookCount++; ?mrG^TV^+r  
  return (hHook!=NULL); &|55:Y87  
} 5H>[@_u+:  
BOOL UnInit() l*/I ; a$  
{ n Hy|  
 if(nHookCount>1){ {3!v<CY'  
  nHookCount--; `|Tr"xavf  
  return TRUE; \~U8<z  
 } JZN'U<R  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 41,Mt  
 if(unhooked==TRUE){ W}nD#9tL  
  nHookCount=0; $I+QyKO9k  
  hHook=NULL; <{7B ^'  
 } C:zK{+  
 return unhooked; FhS:.  
} ?MyXii<a  
,%yjEO  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vA:1z$m  
{ jsc1B  
 BOOL bAdded=FALSE; BPe5c :z  
 for(int index=0;index<MAX_KEY;index++){ h_Q9 c  
  if(hCallWnd[index]==0){ fY$M**/,  
   hCallWnd[index]=hWnd; jj.iW@m  
   HotKey[index]=cKey; (B]rINY|  
   HotKeyMask[index]=cMask; mq su8ti  
   bAdded=TRUE; h0d;a  
   KeyCount++; 1Y\g{A "  
   break; kC0F@'D  
  } (wnkdI{  
 } ErHbc 2  
 return bAdded; ;ukwKf s  
} 9:IVSD&"Rf  
9UZKL@KC  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jL>IX`,+6  
{ 8?h-H #h  
 BOOL bRemoved=FALSE; ytK h[Uo  
 for(int index=0;index<MAX_KEY;index++){ Hh4$Qr;R  
  if(hCallWnd[index]==hWnd){ X^eTf-*T  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |Fm(  
    hCallWnd[index]=NULL; O}"VK  
    HotKey[index]=0; pQ!NhzQ  
    HotKeyMask[index]=0; seB ^o}  
    bRemoved=TRUE; a9`E&Q}z  
    KeyCount--; v&D^N9hy9  
    break; tc.R(F96  
   } >7p?^*&7;  
  } u-$(TyDEl|  
 } vzd1:'^t  
 return bRemoved; $&I##od  
} S{zi8Oc6  
I_oJx  
void VerifyWindow() Cpz'6F^oP  
{ YJ3aJ^m#E  
 for(int i=0;i<MAX_KEY;i++){ #Huvn4x  
  if(hCallWnd!=NULL){ :na9PW`TC  
   if(!IsWindow(hCallWnd)){ C%9;~S  
    hCallWnd=NULL; -uHD| }  
    HotKey=0; s(o{SC'tt  
    HotKeyMask=0; 7H %>\^A^  
    KeyCount--; # 4L[8(+V  
   } yn)K1f^  
  } L Me{5H  
 } z}&?^YU*)`  
} L#1Y R}m  
$0~H~ -  
BOOL CHookApp::InitInstance() s=h  
{ '%vb&a!.6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5IE2&V  
 hins=AfxGetInstanceHandle(); bx_`S#*N  
 InitHotkey(); NiQ`,Q$B  
 return CWinApp::InitInstance(); ?| s1Cuc  
} [I^>ji0V  
I6,'o)l{_  
int CHookApp::ExitInstance() l\I#^N  
{ `lX |yy"  
 VerifyWindow(); /GD4GWv :  
 UnInit(); /'ccFm2  
 return CWinApp::ExitInstance(); O KVIl  
} KuL2X@)}  
^2rNty,nH  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file M_<O'Ii3  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) !`LaX!bmp  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ dbQUW#<Q  
#if _MSC_VER > 1000 ;P3sDN  
#pragma once jCa%(2~iQ7  
#endif // _MSC_VER > 1000 rXPq'k'h#-  
w7 @fiH{  
class CCaptureDlg : public CDialog 3(0k!o0 "  
{ .'k]]2%ILp  
 // Construction `xMmo8u4  
 public: ) jv]Oz  
  BOOL bTray; =ZR9zL=h  
  BOOL bRegistered; =Yg36J4[  
  BOOL RegisterHotkey(); ?5_~Kn%2  
  UCHAR cKey; z-$bce9*  
  UCHAR cMask; XkLl(uyh  
  void DeleteIcon(); kscZ zXv  
  void AddIcon(); G0 Q} 1  
  UINT nCount; A[`c2v-hF  
  void SaveBmp(); 2oyTS*2u_&  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor y !)  
  // Dialog Data rf^ Q%ds  
  //{{AFX_DATA(CCaptureDlg) ,7&`V=C  
  enum { IDD = IDD_CAPTURE_DIALOG }; @ *P$4c  
  CComboBox m_Key; %{ WZ  
  BOOL m_bControl; V3DXoRE-8i  
  BOOL m_bAlt; 1RpTI7  
  BOOL m_bShift; l?2(c  
  CString m_Path; F67%xz0  
  CString m_Number; ()a(PvEO  
  //}}AFX_DATA m7}PJ^*b  
  // ClassWizard generated virtual function overrides <Z GEmQ  
  //{{AFX_VIRTUAL(CCaptureDlg) mN Hd  
 public: Fr_esx  
  virtual BOOL PreTranslateMessage(MSG* pMsg); &'4{/Gz  
 protected: W/q-^Zkt,9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <+I^K 7   
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); qDHiyg^u  
  //}}AFX_VIRTUAL 03$-U0.;-  
  // Implementation (7/fsfsF  
 protected: 3NAU|//J  
  HICON m_hIcon; _ZX"gH x  
  // Generated message map functions ]wFKXZeK  
  //{{AFX_MSG(CCaptureDlg) ?@8[1$1a  
  virtual BOOL OnInitDialog(); .@KpN*`KH  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); golr,+LSo  
  afx_msg void OnPaint(); +EK(r@eV  
  afx_msg HCURSOR OnQueryDragIcon(); 5{/CqUIl  
  virtual void OnCancel(); XHU&ix{Od  
  afx_msg void OnAbout(); hiO:VA  
  afx_msg void OnBrowse(); A`_(L|~  
  afx_msg void OnChange(); kzU;24"K  
 //}}AFX_MSG xEdCGwgp#  
 DECLARE_MESSAGE_MAP() `7_=2C  
}; DID&fj9m  
#endif Au3> =x`  
9DcUx-   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 3yg22y &l  
#include "stdafx.h" O92a*)  
#include "Capture.h" <{ !^  
#include "CaptureDlg.h" o8B_;4uB  
#include <windowsx.h> banie{ e  
#pragma comment(lib,"hook.lib") lCT N dW+=  
#ifdef _DEBUG ? g9mDe;k  
#define new DEBUG_NEW E)z[@Np  
#undef THIS_FILE %.^8&4$+  
static char THIS_FILE[] = __FILE__; =qPk'n9i8  
#endif Q-;ltJ  
#define IDM_SHELL WM_USER+1 ;ELQIHnD"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); DwM4/m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (}E-+:vFU  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; uX_A4ht*  
class CAboutDlg : public CDialog . +_IpygQ  
{ FD>j\  
 public: Zkl:^!*  
  CAboutDlg(); u=^0n2ez  
  // Dialog Data ER,,K._?B  
  //{{AFX_DATA(CAboutDlg) eBiP\  
  enum { IDD = IDD_ABOUTBOX }; l*]9   
  //}}AFX_DATA /LMb~Hy,  
  // ClassWizard generated virtual function overrides k<W n  
  //{{AFX_VIRTUAL(CAboutDlg) $mFsf)1]]?  
 protected: Jg#L8>p1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 09?n5x!6  
  //}}AFX_VIRTUAL nTrfbK@  
  // Implementation <q Z"W6&&  
 protected: Q|eRek  
  //{{AFX_MSG(CAboutDlg) XgY( Vv  
  //}}AFX_MSG  yH_L<n  
  DECLARE_MESSAGE_MAP() . 2_t/2  
}; !g:UkU\J  
k 1;,eB  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) [?TQ!l}8A  
{ )US|&> o8  
 //{{AFX_DATA_INIT(CAboutDlg) 2{naSiaq  
 //}}AFX_DATA_INIT 0_JbE  
} 7s:`]V%  
}G n2%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) AU1P?lk  
{ #6{"c r6l  
 CDialog::DoDataExchange(pDX); il^SGH  
 //{{AFX_DATA_MAP(CAboutDlg) E.W7`zl  
 //}}AFX_DATA_MAP +js3o@Ku{\  
} bh=d'9B@&J  
.UNh\R?r  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) t6 :;0[j  
 //{{AFX_MSG_MAP(CAboutDlg) {m5tgVi&  
 // No message handlers wqDRFZ1*P  
 //}}AFX_MSG_MAP g*8LdH 6mq  
END_MESSAGE_MAP() b:fy  
'>FJk`iI  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -x )(2|  
: CDialog(CCaptureDlg::IDD, pParent) pGw|T~e%  
{ TnET1$@qr*  
 //{{AFX_DATA_INIT(CCaptureDlg) YLk; ^?  
  m_bControl = FALSE; Mi'Q5m  
  m_bAlt = FALSE; PHRc*G{  
  m_bShift = FALSE; X'N 4a  
  m_Path = _T("c:\\"); <LM<,  
  m_Number = _T("0 picture captured.");  iqf+rBL  
  nCount=0; $ hB;r  
  bRegistered=FALSE; 2 =tPxO')B  
  bTray=FALSE; Cnf;5/  
 //}}AFX_DATA_INIT ^EU& 6M2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 'R6D+Vk/  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @'[w7HsJ  
} QI>yi&t  
lv9Ss-c4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) CaNZScnZ  
{ E&0A W{  
 CDialog::DoDataExchange(pDX); %Fb"&F^7  
 //{{AFX_DATA_MAP(CCaptureDlg) oQ!}@CaN|  
  DDX_Control(pDX, IDC_KEY, m_Key); J)(H-xvV  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); &rj6<b1A  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Ne/jvWWN  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); @t`| w.]ml  
  DDX_Text(pDX, IDC_PATH, m_Path); nut;ohIh  
  DDX_Text(pDX, IDC_NUMBER, m_Number); {(G@YG?  
 //}}AFX_DATA_MAP %o< &O(Y  
} #FF5xe  
/b@0HL?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) >K#Z]k  
//{{AFX_MSG_MAP(CCaptureDlg) Jl3l\I'  
 ON_WM_SYSCOMMAND() !7J;h{3Uw  
 ON_WM_PAINT() L]0+ u\(  
 ON_WM_QUERYDRAGICON() IDBhhv3ak  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) +AyQ4Q(-o  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) xMg&>}5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) MnFem $ @  
//}}AFX_MSG_MAP sBp|Lo  
END_MESSAGE_MAP() FsZM_0>/s  
4s*P5w_'/  
BOOL CCaptureDlg::OnInitDialog() Mr:*l`b_  
{ GN{\ccej  
 CDialog::OnInitDialog(); )<4o"R:*  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); W"Dj+/uS  
 ASSERT(IDM_ABOUTBOX < 0xF000); 9.e?<u*-z  
 CMenu* pSysMenu = GetSystemMenu(FALSE); T,(IdVlJ  
 if (pSysMenu != NULL) Rz`<E97-  
 { 93fKv  
  CString strAboutMenu; `u:U{m  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #c4LdZu9  
  if (!strAboutMenu.IsEmpty()) ;3\F b3d  
  { M4M 4*o  
   pSysMenu->AppendMenu(MF_SEPARATOR); (d993~|h  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); tZ>>aiI3  
  } u]E%R&  
 } @&+h3dV.V  
 SetIcon(m_hIcon, TRUE); // Set big icon jLvI!q   
 SetIcon(m_hIcon, FALSE); // Set small icon 7|zt'.56[  
 m_Key.SetCurSel(0); `]]gD EPG{  
 RegisterHotkey(); ]Vjn7P`~ N  
 CMenu* pMenu=GetSystemMenu(FALSE); #f.@XIt'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); nL^6{I~  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 5:|5NX[.b  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); MS^,h>KI  
 return TRUE; // return TRUE unless you set the focus to a control u!g=>zEu  
} R2Tvo?xI7  
3~I<f ^K4  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^'QcP5Fv  
{ oD{V_/pdx  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) A#1aO  
 { f]T1:N*t  
  CAboutDlg dlgAbout; w,8 M  
  dlgAbout.DoModal(); ] >ipC,v  
 } Djf2ir'  
 else dG7sY O@U  
 { ~\<ZWU<BE  
  CDialog::OnSysCommand(nID, lParam); ^ .kas7 <  
 } 6z%3l7#7Yi  
} %n}fkj'  
{ KwLcSn  
void CCaptureDlg::OnPaint() /7S]%UY  
{  +KFK..  
 if (IsIconic())  aSHZR  
 { y#AY+ >  
  CPaintDC dc(this); // device context for painting w])~m1yW  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); >4M_jC.  
  // Center icon in client rectangle ieBW 0eMi  
  int cxIcon = GetSystemMetrics(SM_CXICON); >;xEzc!W3*  
  int cyIcon = GetSystemMetrics(SM_CYICON); rF~q"9  
  CRect rect; +*0THol-  
  GetClientRect(&rect); Zz?+,-$_*&  
  int x = (rect.Width() - cxIcon + 1) / 2; }WI24|`zM  
  int y = (rect.Height() - cyIcon + 1) / 2; 86%weU/*  
  // Draw the icon n^&QOII@>  
  dc.DrawIcon(x, y, m_hIcon); 8x,;B_Zu  
 } 9U}EVpD  
 else (-dJ0!  
 { ,eUMSg~P.7  
  CDialog::OnPaint(); vo7 1T<K  
 } fil6w</L  
} 73}k[e7e  
/Z2*>7HM8[  
HCURSOR CCaptureDlg::OnQueryDragIcon() qWE"vI22M  
{ nj7Ri=lyS  
 return (HCURSOR) m_hIcon; Z/-%Eb]L1  
} \ vJ*3H6  
vy|}\%*r~  
void CCaptureDlg::OnCancel() *y(2BrL>  
{ 6w1:3~a  
 if(bTray) Kyl(  
  DeleteIcon(); dje3&a  
  CDialog::OnCancel(); )0}obPp  
} LiV]!*9$KG  
b:O4d<+%  
void CCaptureDlg::OnAbout() <Isr  
{ y Fp1@*ef  
 CAboutDlg dlg; e:7aVOm  
 dlg.DoModal(); 6@F Z,e  
} 3"L$*toRA  
Be]o2N;J  
void CCaptureDlg::OnBrowse() GtGToI  
{ :cC`wX$  
 CString str; {Z?!*Ow  
 BROWSEINFO bi; 7H >dv'  
 char name[MAX_PATH]; R2J3R5 S=[  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~Q%QA._R?  
 bi.hwndOwner=GetSafeHwnd(); R*&3i$S  
 bi.pszDisplayName=name; D3^v[>E2  
 bi.lpszTitle="Select folder"; T >-F~?7Sv  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ` jUn  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); >LLzG  
 if(idl==NULL) 5~[ Fh2+  
  return; 7L<oWAq  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @~N#)L^  
 str.ReleaseBuffer(); "t\9@nzdX  
 m_Path=str; 6kDU}]c:H]  
 if(str.GetAt(str.GetLength()-1)!='\\') *M`[YG19!e  
  m_Path+="\\"; q?0goL  
 UpdateData(FALSE); aPb!-o{  
} iTK1I0  
QiRzA4-zq  
void CCaptureDlg::SaveBmp() O-'T*M>  
{ A|a\pL`@  
 CDC dc; 3=K-+dhk|t  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Ys3C'Gc  
 CBitmap bm; G: &Q)_  
 int Width=GetSystemMetrics(SM_CXSCREEN); l{pF^?K  
 int Height=GetSystemMetrics(SM_CYSCREEN); 4PF4#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); <s{/ka3  
 CDC tdc; #{ ?oUg>$  
 tdc.CreateCompatibleDC(&dc); Sqge5v  
 CBitmap*pOld=tdc.SelectObject(&bm); ePY K^D  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); eb8_guZ  
 tdc.SelectObject(pOld); Q@j:b]Y9  
 BITMAP btm; qzmZ/z96  
 bm.GetBitmap(&btm); #tfJ?w`  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; { U<h tl4  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 4Sl^cKb$7  
 BITMAPINFOHEADER bih; eo,]b1C2n  
 bih.biBitCount=btm.bmBitsPixel; . LS.Z 4@  
 bih.biClrImportant=0; D0]9 -h  
 bih.biClrUsed=0; 4{Ak|  
 bih.biCompression=0; y\)w#  
 bih.biHeight=btm.bmHeight; l3MH+o  
 bih.biPlanes=1; wGxLs>| 4  
 bih.biSize=sizeof(BITMAPINFOHEADER); Ip0Zf?  
 bih.biSizeImage=size; D2mB4  
 bih.biWidth=btm.bmWidth; WUV Q_<i+  
 bih.biXPelsPerMeter=0; M<L<mP}  
 bih.biYPelsPerMeter=0; 6x7=0}'  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); D"WkD j"M  
 static int filecount=0; tvH)I px  
 CString name; \G"/Myi  
 name.Format("pict%04d.bmp",filecount++); tsa6: D  
 name=m_Path+name; <;T7q EIlo  
 BITMAPFILEHEADER bfh; @kK=|(OB'  
 bfh.bfReserved1=bfh.bfReserved2=0; s1FBz)yCY=  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $R5-JvJJH  
 bfh.bfSize=54+size; ~iSW^mi  
 bfh.bfOffBits=54; axl?t|~I  
 CFile bf; +Q9HsfX/  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2U+&F'&Q  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0jS/U|0  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); t.TQ@c+,J  
  bf.WriteHuge(lpData,size); oe<Y,%u"6  
  bf.Close(); hh{liS% 10  
  nCount++; d"cfSH;h  
 }  (M=Br  
 GlobalFreePtr(lpData); uXC?fMWp.  
 if(nCount==1) JQCwI`%i  
  m_Number.Format("%d picture captured.",nCount); !K2[S J  
 else -,tYfQ;:  
  m_Number.Format("%d pictures captured.",nCount); ]aR4U`  
  UpdateData(FALSE); Ij8tBT?jlL  
} e{O5y8,  
:Ry 24X  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) r6)1Y`K=9  
{ n" ~*9'  
 if(pMsg -> message == WM_KEYDOWN) ;0 *^98K  
 { .s?OKy  
  if(pMsg -> wParam == VK_ESCAPE) h.^DRR^S  
   return TRUE; `iI"rlc  
  if(pMsg -> wParam == VK_RETURN) nX S%>1o,  
   return TRUE; 525 >=h  
 } vB{b/xmah  
 return CDialog::PreTranslateMessage(pMsg); ?uN(" I  
} )-{~7@yqZ  
a8 1%M  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rifxr4c[X>  
{ `lhLIQ'j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ <j#EyGAV  
  SaveBmp(); -T8 gV1*(<  
  return FALSE; ?Sqm`)\>4  
} ["M >  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ F~AS(sk  
 CMenu pop; 7y\g~?5N  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); a*hThr+$M  
 CMenu*pMenu=pop.GetSubMenu(0); X A|`wAGP  
 pMenu->SetDefaultItem(ID_EXITICON); "=(;l3-o  
 CPoint pt; {Jc!T:vJ  
 GetCursorPos(&pt); aiHr2x6  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); d/&|%Z r  
 if(id==ID_EXITICON) B,>FhX>h  
  DeleteIcon(); -Tx tX8v  
 else if(id==ID_EXIT) Mvv=)?:  
  OnCancel(); u^9c`  
 return FALSE; "Zk6B"o)  
} av?BpN"l  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "BRE0Ir:  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )'~FDw\6  
 AddIcon(); Anv8)J!9u  
 return res; uH[0kh  
} OpLSjr  
clw91yrQn  
void CCaptureDlg::AddIcon() <T[N.mB  
{ zf~zYZSr  
 NOTIFYICONDATA data; t] wM_]+  
 data.cbSize=sizeof(NOTIFYICONDATA); to 6Q90(  
 CString tip; y7OG[L/  
 tip.LoadString(IDS_ICONTIP); e63|Z[8  
 data.hIcon=GetIcon(0); o3qv945  
 data.hWnd=GetSafeHwnd(); D3xaR   
 strcpy(data.szTip,tip); j!\0Fyr  
 data.uCallbackMessage=IDM_SHELL; @W8}N|jek  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; DZRxp,  
 data.uID=98; l`&6W?C  
 Shell_NotifyIcon(NIM_ADD,&data); c5e\ckqm^  
 ShowWindow(SW_HIDE); S$52KOo  
 bTray=TRUE; MF}Lv1/[-J  
} ?8@*q6~8  
C4tl4df9  
void CCaptureDlg::DeleteIcon() E{ s|#  
{ |vz;bJG  
 NOTIFYICONDATA data; zDyeAxh4  
 data.cbSize=sizeof(NOTIFYICONDATA); xUi!|c  
 data.hWnd=GetSafeHwnd(); QJWES%m`  
 data.uID=98; &o@5%Rz2/  
 Shell_NotifyIcon(NIM_DELETE,&data); k+$4?/A  
 ShowWindow(SW_SHOW); PAV2w_X~  
 SetForegroundWindow(); L0b] ^_ tI  
 ShowWindow(SW_SHOWNORMAL); }27Vh0v  
 bTray=FALSE; "NH+qQhs  
} 7RE6y(V1  
B:4qW[U#  
void CCaptureDlg::OnChange() ~^~RltY  
{ ZHlin#"  
 RegisterHotkey(); \)ZX4rs{8  
} (B,t 1+%  
Xl6ZV,1=n7  
BOOL CCaptureDlg::RegisterHotkey() $L8s/1up  
{ ws>Iyw.u  
 UpdateData(); *.%)rm  
 UCHAR mask=0; x[W]?`W3r~  
 UCHAR key=0; -#;VFSz,9*  
 if(m_bControl) V)QR!4De  
  mask|=4; |~LjH|*M  
 if(m_bAlt) KH>sCEt  
  mask|=2; <S@mQJS!y  
 if(m_bShift) vC<kpf!  
  mask|=1; ]#q7}Sd  
  key=Key_Table[m_Key.GetCurSel()]; )^S^s >3  
 if(bRegistered){ u6I0<i_KZ  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :YXQ9/iRr  
  bRegistered=FALSE; Qfu*F}  
 } 2G5!u)  
 cMask=mask; <VR&= YJ  
 cKey=key; G!LNP&~  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); j_uY8c>3\q  
 return bRegistered; *2 $m>N  
} N|d.!Q;V.y  
a 8hv.43  
  四、小结 (Zn3-t*  
7WfirRM  
  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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