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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: `('Up?  
  bO6cv{>x  
  一、实现方法 X|g5tnsj`  
0R+p\Nc&1  
  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: /:BC<]s  
)@y'$)5s  
#pragma data_seg("shareddata") CN-4FI)1D9  
HHOOK hHook =NULL; //钩子句柄 H15!QxD#  
UINT nHookCount =0; //挂接的程序数目 =z<sx2#*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 B VH)!]m0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 <; Td8O89_  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey (r'NB  
static int KeyCount =0; wa&:86~l?  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -cZuP7oA  
#pragma data_seg() z5<&}Vh;P  
%wu,c e]*  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ;F71f#iY  
9WQ'"wyAQ  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: )liNjY@  
9n\v{k=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Sn.I{~  
cKey,UCHAR cMask) UN^M.lqZX  
{ 4 BNbS|?vV  
 BOOL bAdded=FALSE; &#~U1: 0  
 for(int index=0;index<MAX_KEY;index++){ MC B2  
  if(hCallWnd[index]==0){ _jxysFl=  
   hCallWnd[index]=hWnd; sv "GX< +  
   HotKey[index]=cKey; g&ba]?[A  
   HotKeyMask[index]=cMask; 9NU-1vd~  
   bAdded=TRUE; RJN LcIm  
   KeyCount++; o@} qPvt0  
   break; CJ#Yu3}  
  } #0#6eT{-  
 } P;&U3i  
 return bAdded; NX]6RZr-  
} (15.?9  
//删除热键 3rX8H`R  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `@:k*d  
{ ,S, R6#3G  
 BOOL bRemoved=FALSE; Q2@yUDd!  
 for(int index=0;index<MAX_KEY;index++){ q^@*k,HG  
  if(hCallWnd[index]==hWnd){ {w99~?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Pb@$RAU6 3  
    hCallWnd[index]=NULL; ;D[I/U  
    HotKey[index]=0; (t,|FkVLV  
    HotKeyMask[index]=0; [{ A5BE -  
    bRemoved=TRUE; IY2f$YV  
    KeyCount--; 5hAs/i9_  
    break; tf9a- s  
   } @Hp=xC9V  
  } + J}h  
 } XR#?gx.}  
 return bRemoved; gvP.\,U  
} PC!X<C8*  
,/Y$%.Rp  
'}P$hP_d  
  DLL中的钩子函数如下: R_:-Z .  
h#|Ac>fz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) a-5#8  
{ gkx<<)y l  
 BOOL bProcessed=FALSE; -N2m|%B  
 if(HC_ACTION==nCode) `M_w^&6+n  
 { %9t=Iu*  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 6" . v6  
   switch(wParam) <<1_rRL]  
   {  FvBnmYn W  
    case VK_MENU: %-NG eN8  
     MaskBits&=~ALTBIT; <bBgevL+_K  
     break; 7b kh")^  
    case VK_CONTROL: L7.LFWq$S  
     MaskBits&=~CTRLBIT; ]jP 0Z#  
     break; DJRr  
    case VK_SHIFT: )Vx C v  
     MaskBits&=~SHIFTBIT; P?iQ{x}w~  
     break; 93Qx+oK]  
    default: //judge the key and send message (i^<er q  
     break; k,[[ CZ0j  
   } FWyfFCK  
   for(int index=0;index<MAX_KEY;index++){ `SYq/6$VEH  
    if(hCallWnd[index]==NULL) 7)Bizlf  
     continue; I{u+=0^Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @'?7au ''  
    { ogE|8`Tq^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M j |"+(  
     bProcessed=TRUE; : DBJ2n  
    } 8PW3x-+  
   } sH)40QmO{  
  } ]LSlo593  
  else if((lParam&0xc000ffff)==1){ //有键按下 0 9*?'^s4  
   switch(wParam) TJ(vq]|&  
   { Hb9r.;r<EW  
    case VK_MENU: 'jU;.vZex  
     MaskBits|=ALTBIT; v;R+{K87  
     break; ]B-3Lh  
    case VK_CONTROL: \MmKz^tO  
     MaskBits|=CTRLBIT; Oj.xJ(uX+v  
     break; TbhsOf!  
    case VK_SHIFT: to'O;f">n  
     MaskBits|=SHIFTBIT; L>2gx$f  
     break; 4:XVu  
    default: //judge the key and send message kS(v|d  
     break; `[.4SIah  
   } o}lA\A  
   for(int index=0;index<MAX_KEY;index++){ K db:Q0B  
    if(hCallWnd[index]==NULL) ^g N?Io  
     continue; _ ~E_#cNn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0Y ld!L  
    { ltG|#(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); k|_LF[*Z  
     bProcessed=TRUE; &0@AM_b  
    } ?rububDT{  
   } nA XWbavY  
  } \EeK<)4:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 mF] 8  
   for(int index=0;index<MAX_KEY;index++){ >`.$Tyw  
    if(hCallWnd[index]==NULL) 2lBfc  
     continue; Y>'t)PK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ezw<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Zk 9i}H  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 x?-kt.M  
   } ;!/g`*?  
  } @RVj~J.A  
 } UNKXfe(X9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); CKRnkTTiV  
} [%BWCd8Q~P  
P}bwEj  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: tp=/f !bv  
/hbdQm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ng<oz*>U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H}&4#CQ'!  
TY *q[AWG  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: AG<TY<nqL  
W!WeYV}kb  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1jQlwT(:  
{ |t h"ET  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 's6hCs&|NV  
 { 23[XmBf  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Eg|C  
  SaveBmp(); ZuQ\Pyx  
  return FALSE; W&Gt^5  
 } B"fKv0  
 …… //其它处理及默认处理 /kK:{  
} Z%O>|ozpq  
wDS(zG   
( G#W6  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 q|7$@H^*  
]k.'~ Syz  
  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。 QDJ:LJz\  
,*'aH z  
  二、编程步骤 #`{L_n$c  
9q f=P3  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 9Kd:7@U  
s~MCt|a  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Hs6}~d  
+c_8~C  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; K+J fU J  
~ 'L`RJR  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; E'4 dI:  
#^&.*' z%z  
  5、 添加代码,编译运行程序。 66shr  
e.ksN  
三、程序代码 8ORr  
dsUY[X-<6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 04cNi~@m  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) r:uW(<EP^  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Di8;Tq  
#if _MSC_VER > 1000 2 VGGSLr  
#pragma once %G>V .d  
#endif // _MSC_VER > 1000 8NzXe 7  
#ifndef __AFXWIN_H__ U/I+A|S[  
#error include 'stdafx.h' before including this file for PCH `h|>;u   
#endif 1$G'Kg/  
#include "resource.h" // main symbols X-=J7G`\h#  
class CHookApp : public CWinApp Ks-aJ+}  
{ v&*}O  
 public: %R [X_n=  
  CHookApp(); F|t_&$Is?  
  // Overrides d9sqO9Ud8  
  // ClassWizard generated virtual function overrides t.E3Fh!o  
  //{{AFX_VIRTUAL(CHookApp) bZsg7[: C  
 public: 9F"Q2^l'  
  virtual BOOL InitInstance(); @s@67\  
  virtual int ExitInstance(); 4\%XC F!  
  //}}AFX_VIRTUAL mrz@Y0mgL  
  //{{AFX_MSG(CHookApp) :Y;\1J<b1  
  // NOTE - the ClassWizard will add and remove member functions here. LQrm/)4bF5  
  // DO NOT EDIT what you see in these blocks of generated code ! Ghpk0ia%d  
  //}}AFX_MSG ,HM~Zs  
  DECLARE_MESSAGE_MAP() [r5k8TB1  
}; #yVMC;J?W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); z7P] g C$\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Tx'ctd#Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); CD+2 w cy  
BOOL InitHotkey(); h8lI# Gs  
BOOL UnInit(); pe1_E KU  
#endif rv?d3QqIC  
~NtAr1  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. qxe%RYdA'j  
#include "stdafx.h" 8^Ov.$rP  
#include "hook.h" j,/t<@S>  
#include <windowsx.h> `F<[\@\d5  
#ifdef _DEBUG E[RLBO[*n  
#define new DEBUG_NEW T>;Kq;(9  
#undef THIS_FILE .wfN.Z  
static char THIS_FILE[] = __FILE__; JKsdPW<?  
#endif d4#Ra%   
#define MAX_KEY 100 d@72z r  
#define CTRLBIT 0x04 .4NQ2k1io  
#define ALTBIT 0x02 op%?V :  
#define SHIFTBIT 0x01 (\6R"2  
#pragma data_seg("shareddata") Z/ypWoV(  
HHOOK hHook =NULL; _("&jfn  
UINT nHookCount =0; ?w[M{   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey g$f ;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 8>|@O<2\  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey = 5 E:CP  
static int KeyCount =0; =_L  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8/y~3~A{D  
#pragma data_seg() U@$=0*  
HINSTANCE hins; I2wT]L UV  
void VerifyWindow(); 'Na/AcRdg  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _Vq7Gxy$R  
//{{AFX_MSG_MAP(CHookApp) ~?c}=XL-  
// NOTE - the ClassWizard will add and remove mapping macros here. wCb%{iowH  
// DO NOT EDIT what you see in these blocks of generated code! p3NTI/-  
//}}AFX_MSG_MAP -)Y?1w  
END_MESSAGE_MAP() `(9B(&t^,  
/B?hM&@z  
CHookApp::CHookApp() 6v9{ $:  
{ ;#$zHR  
 // TODO: add construction code here, 92k}ON  
 // Place all significant initialization in InitInstance e]+ [lq\p@  
} '*KP{"3\  
DjT ekn  
CHookApp theApp; M\s^>7es  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -0) So  
{ ^gdg0y!5~  
 BOOL bProcessed=FALSE; -e{H8ro  
 if(HC_ACTION==nCode) E5%ae (M^  
 { d.7Xvx0Yww  
  if((lParam&0xc0000000)==0xc0000000){// Key up M]>JI'8  
   switch(wParam) N -]m <z>  
   { cg,_nG]i  
    case VK_MENU: }<wj~f([  
     MaskBits&=~ALTBIT; R<!WW9IM  
     break; |7CH  
    case VK_CONTROL: JAA P5ur  
     MaskBits&=~CTRLBIT; _]=`F l  
     break; \?} {wh8  
    case VK_SHIFT: &\C{,:[  
     MaskBits&=~SHIFTBIT; rr[9sk`^H  
     break; bz~-uHC  
    default: //judge the key and send message _l?5GLl_F$  
     break; f-\l<o(  
   } wBcDL/(>  
   for(int index=0;index<MAX_KEY;index++){ y^C; ?B<  
    if(hCallWnd[index]==NULL) *4zVK/FJ  
     continue; "z }bgy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r[$Qtj Q  
    { FVsNOU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); z^4\?R50yO  
     bProcessed=TRUE; ^yRCR] oT  
    } WPE@yI(  
   } ubhem(p#  
  } oh;F]*k6  
  else if((lParam&0xc000ffff)==1){ //Key down r,6~?hG]  
   switch(wParam) EMH?z2iGd  
   { `.dTkL  
    case VK_MENU: ^}8_tZs8\  
     MaskBits|=ALTBIT; p;n)YY$  
     break; U6=m4]~Z  
    case VK_CONTROL: e<^tY0rR&  
     MaskBits|=CTRLBIT; 0nAeeVz|  
     break; Iw"?%k\U  
    case VK_SHIFT: H[x9 7r  
     MaskBits|=SHIFTBIT; ji( S ?^  
     break; 4(JxZ49  
    default: //judge the key and send message .)Se-'  
     break; r _r$nl  
   } su=.4JcK  
   for(int index=0;index<MAX_KEY;index++) CRWO R pP  
   { )m[!HE`cZ  
    if(hCallWnd[index]==NULL) PyHE >C%  
     continue; !*%3um  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ? =IbiT  
    { -T{~m6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); gr=ke #   
     bProcessed=TRUE; Qb# S)[6s+  
    } VH*j3  
   } y&__ 2t^u  
  } "_)   
  if(!bProcessed){ 3iWLo Qm  
   for(int index=0;index<MAX_KEY;index++){ c_^H;~^rL  
    if(hCallWnd[index]==NULL) nbpN+a%  
     continue; 7<.f&1MgI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =GR Em5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,75,~  
   } l!iB -?'u  
  } kd\yHI9A  
 } L761m7J]B  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); lQ+-g#`  
} >5 5/@+^  
_k+Bj.L  
BOOL InitHotkey() *rEW@06^\  
{ &U 'Ds!  
 if(hHook!=NULL){ g1J]z<&  
  nHookCount++; f\(Kou$  
  return TRUE; db%`- UST  
 } P6=|C;[  
 else # |UrHK;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;U`HvIch  
  if(hHook!=NULL) 0XozYyq  
   nHookCount++; 103Ik6.o  
  return (hHook!=NULL); _X.M,id  
} [=E<iPl  
BOOL UnInit() .Yu,&HR  
{ d&'6l"${  
 if(nHookCount>1){ 50H[u|  
  nHookCount--; 'ZDa*9nkF  
  return TRUE; r?V|9B`$p  
 } 7SqsVq`[~  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +vbNZqwz  
 if(unhooked==TRUE){ 4t8 Hy  
  nHookCount=0; n6uobo-  
  hHook=NULL; f:utw T  
 } Vk_L*lcN  
 return unhooked; (~#PzE :  
} zu|pL`X  
sU}e78mh  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \R#XSW,  
{ q5RLIstQ\  
 BOOL bAdded=FALSE; mA>Pr<aV:  
 for(int index=0;index<MAX_KEY;index++){ Sdt @"6  
  if(hCallWnd[index]==0){ ,vhR99g{  
   hCallWnd[index]=hWnd; xjX5PQu  
   HotKey[index]=cKey; OIWo* %  
   HotKeyMask[index]=cMask; Ql V:8:H$  
   bAdded=TRUE; ]CL70+[^9  
   KeyCount++; L]tyL)  
   break; 6a,YxR\  
  } XnG!T$  
 } V?rI,'F>N  
 return bAdded; ]JM9 ^F  
} HxM-VK '  
g{a0,B/j  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) uIPR*9~6o  
{ $i`YtV  
 BOOL bRemoved=FALSE; kdo)y(fn@  
 for(int index=0;index<MAX_KEY;index++){ FVpe*]  
  if(hCallWnd[index]==hWnd){ QDDSJ>l5_T  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ kB:R- St  
    hCallWnd[index]=NULL; eeX>SL5'i  
    HotKey[index]=0; 0!zWXKX  
    HotKeyMask[index]=0; 2Vi[qS^  
    bRemoved=TRUE; JL$RBr  
    KeyCount--; O ,;SA  
    break; M>^IQ  
   } ;}PL/L$L6;  
  } AUq?<Vg\  
 } /;>EyWW  
 return bRemoved;  6$Dbeb  
} #QB`'2)vw  
2KX *x_-   
void VerifyWindow() }$UFc1He\J  
{ I'j? T.  
 for(int i=0;i<MAX_KEY;i++){ w7W-=\Hvh  
  if(hCallWnd!=NULL){ #nd,cn  
   if(!IsWindow(hCallWnd)){ _8`|KY  
    hCallWnd=NULL; X3>(K1  
    HotKey=0; bC{~/ JP  
    HotKeyMask=0; ?:2Xh/8-  
    KeyCount--; u J$"2<O  
   } SW=p5@Hy{  
  } f ;Dz(~ hw  
 } XU54skN  
} 93rE5eGs  
8;5/_BwMu  
BOOL CHookApp::InitInstance() +l#2u#e  
{ !`WuLhB`  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); $ S49v  
 hins=AfxGetInstanceHandle(); Xgm7>=l  
 InitHotkey(); 7 D^A:f  
 return CWinApp::InitInstance(); -_}EQ9Q  
} ?\yo~=N^  
_`(g?  
int CHookApp::ExitInstance() a"zoDD/  
{ g$tW9 Q  
 VerifyWindow(); l%IOdco#  
 UnInit(); E5 dXu5+ye  
 return CWinApp::ExitInstance(); (o|E@d  
} 'K!kJ9oqe  
)>/c/ B  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file  96BMJE'  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G1l(  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ GB=q}@&8p  
#if _MSC_VER > 1000 e'`oisJU?q  
#pragma once N 4:'X6u;  
#endif // _MSC_VER > 1000 : ?V;  
#.@=xhK/  
class CCaptureDlg : public CDialog o6r4tpiR5  
{ `#]\Wnp~y  
 // Construction Dn[1BWM/7  
 public: `4=b|N+b"  
  BOOL bTray; $1v5*E  
  BOOL bRegistered; ymzm x$o=  
  BOOL RegisterHotkey(); S;NXOsSu  
  UCHAR cKey; HT&0i,`  
  UCHAR cMask; zxh"@j$?  
  void DeleteIcon(); = `^jz}  
  void AddIcon(); jmFN*VIL  
  UINT nCount; NR*SEbUU*  
  void SaveBmp();  /F_ :@#H  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor JVkawkeX  
  // Dialog Data sa`Yan  
  //{{AFX_DATA(CCaptureDlg) S|[UEU3FpB  
  enum { IDD = IDD_CAPTURE_DIALOG }; %Z7!9+<  
  CComboBox m_Key;  g{%';  
  BOOL m_bControl;  UyQn onS  
  BOOL m_bAlt; o;[oy#aWl_  
  BOOL m_bShift; &0g,Xkr  
  CString m_Path; g|P hNo  
  CString m_Number; 1@WGbORc*  
  //}}AFX_DATA 82X.  
  // ClassWizard generated virtual function overrides Y8PT`7gd`  
  //{{AFX_VIRTUAL(CCaptureDlg) "|.(yN  
 public: #RF=a7&F  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Trrh`@R  
 protected: gy{a+Wbc*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <}%ir,8  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); B /W$RcV  
  //}}AFX_VIRTUAL `T70FsSJ  
  // Implementation Q-F9oZ*0  
 protected: "7HB3?2>W  
  HICON m_hIcon; ~laZ(Bma);  
  // Generated message map functions L9T u>4  
  //{{AFX_MSG(CCaptureDlg) :m d3@r']  
  virtual BOOL OnInitDialog(); Pio^5jhB6  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); z+*Z<c5d  
  afx_msg void OnPaint(); -?W@-*J  
  afx_msg HCURSOR OnQueryDragIcon(); | 6>_L6t  
  virtual void OnCancel(); aM~fRra7  
  afx_msg void OnAbout(); %\l,X{X  
  afx_msg void OnBrowse(); L3AwL)I   
  afx_msg void OnChange(); zqh{=&Tjx  
 //}}AFX_MSG Db=gS=Qm  
 DECLARE_MESSAGE_MAP() gnXjd}  
}; +a/o)C{  
#endif W(aRO  
-e~U u  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9^u?v`!  
#include "stdafx.h" qN@a<row&~  
#include "Capture.h" o!~bR  
#include "CaptureDlg.h" to3J@:V8e  
#include <windowsx.h> d<'xpdxc  
#pragma comment(lib,"hook.lib") |Z ,G  
#ifdef _DEBUG Q7|13^ |C  
#define new DEBUG_NEW kre&J  
#undef THIS_FILE $1+K}tP  
static char THIS_FILE[] = __FILE__; 5F"?]'*/  
#endif Nd!VR+IZ  
#define IDM_SHELL WM_USER+1 vi8~j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^>Y%L(>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NJ>p8P`_k  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; oui!fTy  
class CAboutDlg : public CDialog L2'd sOn  
{ :2E1aVo4b  
 public: j&A3s{S4A  
  CAboutDlg(); (GG"'bYk  
  // Dialog Data 2~V Im#  
  //{{AFX_DATA(CAboutDlg) ZRB 0OH  
  enum { IDD = IDD_ABOUTBOX }; Yys~p2  
  //}}AFX_DATA }&DB5M  
  // ClassWizard generated virtual function overrides Jj:6 c  
  //{{AFX_VIRTUAL(CAboutDlg) \w^QHX1+  
 protected: FRFAWK<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support * Xoscc  
  //}}AFX_VIRTUAL It4z9Gh  
  // Implementation R`2A-c  
 protected: L]d@D0.Z  
  //{{AFX_MSG(CAboutDlg) W(h8!}  
  //}}AFX_MSG N}fUBX4k  
  DECLARE_MESSAGE_MAP() N-`;\  
}; t1jlxK  
ht)nx,e=  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) pFTlhj)1  
{ n=? 0g;1!  
 //{{AFX_DATA_INIT(CAboutDlg) P]"d eB|  
 //}}AFX_DATA_INIT lGUV(D  
} oDP((I2-  
NRisr  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) B#"|5  
{ WuFwt\U  
 CDialog::DoDataExchange(pDX); nKB&|!  
 //{{AFX_DATA_MAP(CAboutDlg) t i^v%+r1  
 //}}AFX_DATA_MAP c^O#O  
} z,FTsR$x  
*O> aqu  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) UglG!1L  
 //{{AFX_MSG_MAP(CAboutDlg) 5 xDN&su  
 // No message handlers ]TgP!M&q  
 //}}AFX_MSG_MAP 9K':Fn2,  
END_MESSAGE_MAP() lt6;*z[  
ShJK&70O  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) cEc,eq|  
: CDialog(CCaptureDlg::IDD, pParent) XcMJD(!  
{ -,VhSI  
 //{{AFX_DATA_INIT(CCaptureDlg) _sR9   
  m_bControl = FALSE; 1/ pA/UVO  
  m_bAlt = FALSE; _]xt65TL  
  m_bShift = FALSE; oL'1Gm@X?  
  m_Path = _T("c:\\"); .3<IOtD=  
  m_Number = _T("0 picture captured."); Jh4&Qh|t  
  nCount=0; 3;MjO*-  
  bRegistered=FALSE; 0^_lj9B!  
  bTray=FALSE; l(#ke  
 //}}AFX_DATA_INIT tIb21c q  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ny(GTKoUz  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); eQFb$C]R}y  
} 7TkxvSL X  
vM7vf6  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;Q=GJ5`B  
{ {M r~%y4  
 CDialog::DoDataExchange(pDX); ^2^|AXNES  
 //{{AFX_DATA_MAP(CCaptureDlg) 5!F\h'E  
  DDX_Control(pDX, IDC_KEY, m_Key); ZBmXaP[9  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); #RM3^]h  
  DDX_Check(pDX, IDC_ALT, m_bAlt); F|l`YtZZd  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); x8?x/xE  
  DDX_Text(pDX, IDC_PATH, m_Path); 5 n+ e  
  DDX_Text(pDX, IDC_NUMBER, m_Number); {kPe#n>xT  
 //}}AFX_DATA_MAP q{cp|#m#G  
} 3z)"U  
r1oku0o  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $54=gRo^  
//{{AFX_MSG_MAP(CCaptureDlg) <D!c ~*[  
 ON_WM_SYSCOMMAND() qC1U&b#MVx  
 ON_WM_PAINT() H5rPq_R  
 ON_WM_QUERYDRAGICON() P:(EU s}0  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .L7Yf+yFg  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /^LH  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *)bd1B#  
//}}AFX_MSG_MAP B9e.-Xaf  
END_MESSAGE_MAP() 'DzBp  
8.CKH4h  
BOOL CCaptureDlg::OnInitDialog() f[Fgh@4cj  
{ )W]>\=@Y  
 CDialog::OnInitDialog(); N pXgyD  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }B"|z'u  
 ASSERT(IDM_ABOUTBOX < 0xF000); _t|G@D{   
 CMenu* pSysMenu = GetSystemMenu(FALSE); +Cf0Y2*@hM  
 if (pSysMenu != NULL) YxEbg(Y  
 { qA/#IUi)1  
  CString strAboutMenu; mT6q}``vtG  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Fkc x+d  
  if (!strAboutMenu.IsEmpty()) Jf?S9r5Q  
  { Er"R;l]xJ  
   pSysMenu->AppendMenu(MF_SEPARATOR); LgP>u?]n  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Qq T/1^imS  
  } y98JiNq  
 } cXS;z.M\_  
 SetIcon(m_hIcon, TRUE); // Set big icon 0AK?{y U  
 SetIcon(m_hIcon, FALSE); // Set small icon jQ_dw\ {0  
 m_Key.SetCurSel(0); q*[!>\ Z8  
 RegisterHotkey(); 19F ;oFp  
 CMenu* pMenu=GetSystemMenu(FALSE); N )zPxQ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); U['JFLF  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); | "Jx  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); j?\$G.Y  
 return TRUE; // return TRUE unless you set the focus to a control gT(th9'+z  
} JG@L5f  
"($Lx  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9jO`gWxV8*  
{ &_9YLXtMi;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 'u(=eJ@1  
 { VyecTU"W  
  CAboutDlg dlgAbout; C5es2!^-]O  
  dlgAbout.DoModal(); "H>r-cyh  
 } 894r;UA7  
 else q Vm"f,ruo  
 { 4D^ M<Xn  
  CDialog::OnSysCommand(nID, lParam); =`qRu  
 } x0\e<x9s  
} -uA3Y  
Z}8k[*.  
void CCaptureDlg::OnPaint() ]By0Xifew  
{ |*^8~u3J"  
 if (IsIconic()) `]`=]*d  
 { M=5d95*-}  
  CPaintDC dc(this); // device context for painting =U4f}W;  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &|Lh38s@$#  
  // Center icon in client rectangle #puQi  
  int cxIcon = GetSystemMetrics(SM_CXICON); \G$QNUU  
  int cyIcon = GetSystemMetrics(SM_CYICON); >vWEUE[  
  CRect rect; U~uwm/h  
  GetClientRect(&rect); 6FL?4>MZ  
  int x = (rect.Width() - cxIcon + 1) / 2; 5vD3K! \u  
  int y = (rect.Height() - cyIcon + 1) / 2; J| SwQE~  
  // Draw the icon 6OL41g'  
  dc.DrawIcon(x, y, m_hIcon); lSH ZV Fd  
 } (U|)xA]y!  
 else XC|*A$x,  
 { )v%l0_z{  
  CDialog::OnPaint(); z,pNb%*O  
 } 6xH;: B)d  
} X=v~^8M7%  
5>k>L*5J  
HCURSOR CCaptureDlg::OnQueryDragIcon() wgY6D!Y   
{ 9p <:=T  
 return (HCURSOR) m_hIcon; ?gLR<d_  
} [IiwNqZ[~  
,YjxC p3  
void CCaptureDlg::OnCancel() u`'ki7LA  
{ >M?H79fF2s  
 if(bTray) Hm>-LOCcl  
  DeleteIcon(); 7\mDBG  
  CDialog::OnCancel(); :?HSZocf  
} %'N$l F"]  
Iq{o-nq  
void CCaptureDlg::OnAbout() ,-@xq.D  
{ 807al^s x  
 CAboutDlg dlg; }@d>,1DU  
 dlg.DoModal(); ,09DBxQq,  
} wGg0 hL  
}FrEF\}]_7  
void CCaptureDlg::OnBrowse() '%R<"  
{ ~gP7s_ qr{  
 CString str; qQ^d9EK'?~  
 BROWSEINFO bi; tcZa~3.  
 char name[MAX_PATH]; & =G)NeT_  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); H#OYw#L"u  
 bi.hwndOwner=GetSafeHwnd(); & x`&03X  
 bi.pszDisplayName=name; rfYP*QQY  
 bi.lpszTitle="Select folder"; Zr=ib  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; d$pYo)8o({  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ^f9>l;Lb  
 if(idl==NULL) p"2m90IO  
  return; Cl,9yU)1n  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); elu=9d];@  
 str.ReleaseBuffer(); )1WMlG  
 m_Path=str; jh[ #p?:  
 if(str.GetAt(str.GetLength()-1)!='\\') H"eS<eT  
  m_Path+="\\"; 13H;p[$  
 UpdateData(FALSE); <PX.l%  
} z<!O!wX_aI  
>Iuzk1'S  
void CCaptureDlg::SaveBmp() G~"z_ (  
{ u$C\E<G^  
 CDC dc; h\(B#SN  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); :$NsR*Cq*9  
 CBitmap bm; GQb i$kl  
 int Width=GetSystemMetrics(SM_CXSCREEN); eH %Ja[  
 int Height=GetSystemMetrics(SM_CYSCREEN); GWhE8EDT  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ?=<~^Lk  
 CDC tdc; JnY$fs*"  
 tdc.CreateCompatibleDC(&dc); FQ`(b3.   
 CBitmap*pOld=tdc.SelectObject(&bm); }`9jH:q-Z  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?ty>}.c t  
 tdc.SelectObject(pOld); 2HD:JdL  
 BITMAP btm; q]CeD   
 bm.GetBitmap(&btm); 1w`2Dt  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 5$kdgFq(  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); J96uyS*  
 BITMAPINFOHEADER bih; :_v!#H)  
 bih.biBitCount=btm.bmBitsPixel; @OzMiN  
 bih.biClrImportant=0; Hfh!l2P  
 bih.biClrUsed=0; fN@{y+6  
 bih.biCompression=0; pe.Ml7o"  
 bih.biHeight=btm.bmHeight; >%u@R3PH]  
 bih.biPlanes=1; AotCX7T2T  
 bih.biSize=sizeof(BITMAPINFOHEADER); #.H}r6jqs  
 bih.biSizeImage=size; X3<K 1/<  
 bih.biWidth=btm.bmWidth; P;73Hr[E#  
 bih.biXPelsPerMeter=0; h$>wv`  
 bih.biYPelsPerMeter=0; 1c$vLo832  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); J/ vK6cO\  
 static int filecount=0; nq1 'F  
 CString name; 7tRi"\[5  
 name.Format("pict%04d.bmp",filecount++); TN\|fzj  
 name=m_Path+name; R:M,tL-l  
 BITMAPFILEHEADER bfh; V,Q4n%h1.  
 bfh.bfReserved1=bfh.bfReserved2=0; d`mD!)j  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 96c?3ya  
 bfh.bfSize=54+size; {L].T#  
 bfh.bfOffBits=54; BgM%+b8u  
 CFile bf; -}P7$|O &  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ &n:{x}Uc  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3@_Elu  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); zyFUl%  
  bf.WriteHuge(lpData,size); L0L2Ns  
  bf.Close(); M/pMs 6  
  nCount++; a7#?h%wf  
 } eklgLU-+fW  
 GlobalFreePtr(lpData); ]n;1x1'  
 if(nCount==1) &l m#  
  m_Number.Format("%d picture captured.",nCount); )"| ||\Iv  
 else |0g{"}%  
  m_Number.Format("%d pictures captured.",nCount); 2}vNSQvG  
  UpdateData(FALSE); d$G}iJ8$mp  
} 1y(UgEg   
\F{:5,Du)  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Z+4D.bA  
{ T7[NcZ:I  
 if(pMsg -> message == WM_KEYDOWN) WF[bO7:  
 { $,ikv?"L  
  if(pMsg -> wParam == VK_ESCAPE) 4t*so~  
   return TRUE; 2:SO_O4C  
  if(pMsg -> wParam == VK_RETURN) v+xB7w  
   return TRUE; '#.#$8l  
 } Ls}7VKl'   
 return CDialog::PreTranslateMessage(pMsg); qtMD CXZ^n  
} PyBD  
hr/o<#OW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) r|eZv<6  
{ @kxel`,$e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |gx ~ gG<  
  SaveBmp(); u5+|Su  
  return FALSE; *2e!M^K<  
} }r%X`i|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O"Q7Rx  
 CMenu pop; sOpep  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); l63hLz  
 CMenu*pMenu=pop.GetSubMenu(0); BUsV|e\  
 pMenu->SetDefaultItem(ID_EXITICON); y(i Y  
 CPoint pt; h&;t.Gdf  
 GetCursorPos(&pt); }Wh6zT)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); S6g<M5^R  
 if(id==ID_EXITICON) KC#/Z2A|<  
  DeleteIcon(); c{Ou^.yR  
 else if(id==ID_EXIT) xfFg,9w8  
  OnCancel(); ba@ctkCW  
 return FALSE; %IY``r)j  
} {A:j[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :J/M,3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -LW[7s$  
 AddIcon(); Iz@)!3h  
 return res; Fmr}o(q1  
} yN6>VD{F  
 Vzl^Ka'  
void CCaptureDlg::AddIcon() VIJ<``9[  
{ :O= \<t  
 NOTIFYICONDATA data; wW>fVP r  
 data.cbSize=sizeof(NOTIFYICONDATA); @~ETj26U'  
 CString tip; y[?-@7i  
 tip.LoadString(IDS_ICONTIP); qfoD  
 data.hIcon=GetIcon(0); i+{yMol1  
 data.hWnd=GetSafeHwnd(); T'H::^9:E  
 strcpy(data.szTip,tip); n, i'Dhzk  
 data.uCallbackMessage=IDM_SHELL; N?P%-/7  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; oCS2E =O&  
 data.uID=98; ,9D+brm  
 Shell_NotifyIcon(NIM_ADD,&data); 4\M.6])_   
 ShowWindow(SW_HIDE); `bjizS'^  
 bTray=TRUE; 0#cy=*E  
} ,yd=e}lQx  
_zWfI.o  
void CCaptureDlg::DeleteIcon() qIMA6u/  
{ De&6 9  
 NOTIFYICONDATA data; .iD*>M:W  
 data.cbSize=sizeof(NOTIFYICONDATA); !\Xm!I8  
 data.hWnd=GetSafeHwnd(); Tr0B[QF  
 data.uID=98; NnT g3:.  
 Shell_NotifyIcon(NIM_DELETE,&data); i0jBZW"_1$  
 ShowWindow(SW_SHOW); Bi,;lR5  
 SetForegroundWindow(); GH1"xR4!  
 ShowWindow(SW_SHOWNORMAL); [`RX*OH2  
 bTray=FALSE; s?R2B)a  
} u8GMUN  
kOo~%kcQ'  
void CCaptureDlg::OnChange() `;l.MZL!  
{ @&|l^ 1  
 RegisterHotkey(); *+)AqKP\Kv  
} ig}A9j?]  
\p{5D`HY  
BOOL CCaptureDlg::RegisterHotkey() e]=lKxFh&l  
{ a ^d8I  
 UpdateData(); : j }fC8'  
 UCHAR mask=0; R:Q0=PzDi#  
 UCHAR key=0; L2Pujk  
 if(m_bControl) /,=@8k!t?  
  mask|=4; { FZ=olZ  
 if(m_bAlt) 3psU?8(  
  mask|=2; Z_1U9 +,  
 if(m_bShift) 7\FXz'hA  
  mask|=1; V-'K6mn;  
  key=Key_Table[m_Key.GetCurSel()]; fjk\L\1  
 if(bRegistered){ . \   
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 10!wqyj&  
  bRegistered=FALSE; ,<BbpIQ2o  
 } *}k;L74|  
 cMask=mask; ^sN (  
 cKey=key; yeDsJ/L  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^V$Ajt  
 return bRegistered; ivDGZI9  
} M])dJ9&e  
;{h CF  
  四、小结 ]I3!fEAWR  
,C%eBna4Iq  
  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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