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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: nXgnlb=  
  QEKRAPw  
  一、实现方法 pwg$% lv  
#cB=] (N  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: VO _! +  
2V6=F[T  
#pragma data_seg("shareddata") c/l%:!A  
HHOOK hHook =NULL; //钩子句柄 axJuJ`+Y  
UINT nHookCount =0; //挂接的程序数目 =oZHN,  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 +mM=`[Z`??  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 =T73660  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey OE{{,HFa`G  
static int KeyCount =0; "N"$B~W*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 9"KO!w  
#pragma data_seg() hf6=`M}>i  
l^.d 3b  
  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。 g@IV|C( *0  
 1 &24:&  
  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: YCv)DW;  
Tr}z&efY  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6OBe^/ZRt  
cKey,UCHAR cMask) d~i WV6Va  
{ Vu @2  
 BOOL bAdded=FALSE; &`#k 1t'  
 for(int index=0;index<MAX_KEY;index++){ VrV )qfG  
  if(hCallWnd[index]==0){ zV)(i<Q  
   hCallWnd[index]=hWnd; K gN=b  
   HotKey[index]=cKey; RrFq"  
   HotKeyMask[index]=cMask; F32N e6Y6"  
   bAdded=TRUE; 8v$ 2*$  
   KeyCount++; zf@gAvJ  
   break; 7Hghn"ol  
  } "gm[q."n<  
 } HGuU6@~hu  
 return bAdded; (HNxo{t  
} M^q< qS>d  
//删除热键 Ttr)e:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @ |bN[XL  
{ 4( Q_J4}P  
 BOOL bRemoved=FALSE; #[|~m;K(w  
 for(int index=0;index<MAX_KEY;index++){ 4@2<dw|*h  
  if(hCallWnd[index]==hWnd){ )-98pp7~BB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ` Aa}q(}k  
    hCallWnd[index]=NULL; 7_OC&hhL  
    HotKey[index]=0; ^!Y]l  
    HotKeyMask[index]=0; MQs!+Z"m>  
    bRemoved=TRUE; d:Y!!LV-@L  
    KeyCount--; r[doN{%  
    break; 75@!j[QL<  
   } cB$OkaG#  
  } #@ClhpLD  
 } n$2Ia E;v  
 return bRemoved; zD#$]?@ b  
} AcZ{B<  
2TFb!?/RQ  
#&V7CYJ  
  DLL中的钩子函数如下: k#eH Q!  
iA~LH6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) D4@).%  
{ :;Lt~:0b~  
 BOOL bProcessed=FALSE; CbvP1*1  
 if(HC_ACTION==nCode) mLEJt,X  
 { v'Y0|9c  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 s$%t*T2J>  
   switch(wParam) Ro}7ERA  
   {  ~]sj.>P  
    case VK_MENU: +8<|P&fH  
     MaskBits&=~ALTBIT; )b%t4~7  
     break; ^T?zR7r  
    case VK_CONTROL: KT5amct  
     MaskBits&=~CTRLBIT; lN(|EI  
     break; OD@k9I[  
    case VK_SHIFT: hgYi ,e  
     MaskBits&=~SHIFTBIT; 0V RV. Ml  
     break; a&^HvXO(>(  
    default: //judge the key and send message ro&/  
     break; a+HGlj 2>  
   } EZ,Tc ;f=  
   for(int index=0;index<MAX_KEY;index++){ 'CQ~ZV5  
    if(hCallWnd[index]==NULL) yL2sce[  
     continue; {GH0> 1&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1K* `i(  
    { Zz,j,w0 Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); d}RU-uiW  
     bProcessed=TRUE; #mIgk'kW<  
    } #EG W76 f  
   } O{vVW9Q  
  } ~U;M1>  
  else if((lParam&0xc000ffff)==1){ //有键按下 Mb!b0  
   switch(wParam) w3 n6md  
   { W u C2 LM  
    case VK_MENU: OO?;??  
     MaskBits|=ALTBIT; 1>c^-"#e^  
     break; RJ\'"XQ  
    case VK_CONTROL: <E2n M,  
     MaskBits|=CTRLBIT; 539f B,  
     break; jv ;8Mm  
    case VK_SHIFT: 7 @W}>gnf  
     MaskBits|=SHIFTBIT; Io;x~i09K  
     break; `4SwdW n  
    default: //judge the key and send message ~=P#7l\o1  
     break; <r>1W~bp.q  
   } WMw|lV r  
   for(int index=0;index<MAX_KEY;index++){ C vOH*K'  
    if(hCallWnd[index]==NULL) >g>L>{  
     continue; T1-.+&<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \ u*R6z  
    { [ML|, kq!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;aj4V<@  
     bProcessed=TRUE; .OM^@V~T  
    } A"3"f8P8a  
   } 3(oB[9]s  
  } J16t&Ha`  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 @<TC+M5!  
   for(int index=0;index<MAX_KEY;index++){ M?S&@\}c  
    if(hCallWnd[index]==NULL) im-XP@<  
     continue; Z[ 53cVT^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LJgGX,Kp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /;X+<Wj  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 gLss2i.r  
   } <"hq}B  
  } )KdEl9o  
 } al{}_1XoU  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Nx;Oz  
} L^FQ|?*  
uFUVcWt  
  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: a5k![sw\  
p 2>\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W9rmAQjn  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !hugn6  
f-BPT2U+  
  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: T;M4NGmvd  
TFZxk  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "$I8EW/1  
{ FyhLMW3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) O<`N0  
 { }~#Tsv  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 o)L)|  
  SaveBmp(); uPVO!`N3  
  return FALSE; HkQ rij6  
 } pwg\b  
 …… //其它处理及默认处理 ]<BT+6L  
} 8x`E UJ  
Ods~tM  
c }7gHud  
  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。 YXLZ2-%ohZ  
Vv&GyqoO]  
  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。 Pb}Iiq=  
0 K(&EpVE  
  二、编程步骤 w }=LC#le  
p f`vH`r  
  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"; XS(Q)\"  
.)c+gyaQ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; I]-"Tw  
l+#uQo6cqQ  
  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; ?~3Pydrb#  
^2`*1el  
  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; v ;nnr0;  
U?xa^QVhj  
  5、 添加代码,编译运行程序。 C <d]0)  
n[gc`#7|{e  
三、程序代码 Ez+8B|0P  
NydF'N_1  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL no,b_0@N  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {Rz(0oD\  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ X?$"dqA  
#if _MSC_VER > 1000 u\3=m%1  
#pragma once -`CE;  
#endif // _MSC_VER > 1000 {%D4%X<  
#ifndef __AFXWIN_H__ IP!`;?T=  
#error include 'stdafx.h' before including this file for PCH W.(Q u-AE(  
#endif > ofWHl[-  
#include "resource.h" // main symbols r]deVd G  
class CHookApp : public CWinApp QKIg5I-  
{ MmQk@~  
 public: >ra)4huZ  
  CHookApp(); gs(ZJO1 /L  
  // Overrides XC!Y {lp  
  // ClassWizard generated virtual function overrides f_z]kA +H  
  //{{AFX_VIRTUAL(CHookApp) !PfdY&.)  
 public: Y;{(?0 s  
  virtual BOOL InitInstance(); Ce:w^P+  
  virtual int ExitInstance(); X- j@#Qb  
  //}}AFX_VIRTUAL Z_4|L+i<{  
  //{{AFX_MSG(CHookApp) avY<~-44B  
  // NOTE - the ClassWizard will add and remove member functions here. eyuQ}R  
  // DO NOT EDIT what you see in these blocks of generated code ! 7 &iav2q  
  //}}AFX_MSG wln"g,ct  
  DECLARE_MESSAGE_MAP() /],9N  
}; t+#vcg,G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); b/d 1(B@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )C$pjjo/`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l^2m7 7)  
BOOL InitHotkey(); w7~cY=  
BOOL UnInit(); "I QM4:  
#endif x~ E\zw  
*{(tg~2'(  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1Q7]1fRu  
#include "stdafx.h" 0*,] `A=  
#include "hook.h" d^Rea8  
#include <windowsx.h> m[nrr6 G"  
#ifdef _DEBUG XZ:6A]62I  
#define new DEBUG_NEW ~?Zm3zOCc2  
#undef THIS_FILE |`'WEe2  
static char THIS_FILE[] = __FILE__; oml^f~pm  
#endif _ZE&W  
#define MAX_KEY 100 c#Qlr{ES  
#define CTRLBIT 0x04 A"6&   
#define ALTBIT 0x02 _2WW0  
#define SHIFTBIT 0x01 \;1nEjIA  
#pragma data_seg("shareddata") m U= 3w  
HHOOK hHook =NULL; lv#L+}T  
UINT nHookCount =0; ?(Xy 2%v  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 3b/J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT SNC)cq+{  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey :)F0~Q  
static int KeyCount =0; '>GPk5Nq77  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -Np}<O`./  
#pragma data_seg() y?UB?2 VN  
HINSTANCE hins; RBpv40n0  
void VerifyWindow(); A&{eC C  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) i.gagb  
//{{AFX_MSG_MAP(CHookApp) HfEl TC:3f  
// NOTE - the ClassWizard will add and remove mapping macros here. U lPhW~F)  
// DO NOT EDIT what you see in these blocks of generated code! y;f nC5Q  
//}}AFX_MSG_MAP q}C;~nMD  
END_MESSAGE_MAP() !$p E=~1C  
%zN~%mJG  
CHookApp::CHookApp() hX:yn:P~  
{ sj&1I.@,>  
 // TODO: add construction code here, !1#=j;N`  
 // Place all significant initialization in InitInstance *9US>mVy  
} |=[. _VH1  
kR <\iT0j  
CHookApp theApp; 'VV"$`Fu"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,"5xKF+cS  
{ !?z"d  
 BOOL bProcessed=FALSE; \=H+m%  
 if(HC_ACTION==nCode) 7 iQa)8,  
 { QtLd(& !v  
  if((lParam&0xc0000000)==0xc0000000){// Key up aZmac'cz{  
   switch(wParam) VDlP,Mm*  
   { @%8$k[  
    case VK_MENU: QC(ce)Y  
     MaskBits&=~ALTBIT; VuuF _y;  
     break; oGL2uQXX  
    case VK_CONTROL: 6 )lWuY]e  
     MaskBits&=~CTRLBIT; 'OU`$K7n  
     break; zor  
    case VK_SHIFT: 6%MM)Vj+u  
     MaskBits&=~SHIFTBIT; Wu)An  
     break; SqVh\Nn  
    default: //judge the key and send message [j?<&^SW  
     break; lt%9Zgr[u  
   } ctR ^"'u  
   for(int index=0;index<MAX_KEY;index++){ s6!! ty;Y  
    if(hCallWnd[index]==NULL) fr&K^je\  
     continue; Sc:)H2k`$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vofBS   
    { :H/Rhx=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); NW` Mc&  
     bProcessed=TRUE; REPI >-|  
    } /}S1e P6  
   } EQX?Zs?C  
  } :/6u*HwZh  
  else if((lParam&0xc000ffff)==1){ //Key down >fp_$bjd  
   switch(wParam) VqS1n  
   { 6%&DJBU!  
    case VK_MENU: awSi0*d~  
     MaskBits|=ALTBIT; vb$i00?  
     break; _xM3c&VeG  
    case VK_CONTROL: 7b(r'b@N  
     MaskBits|=CTRLBIT; PQ" v  
     break; @eP(j@(^  
    case VK_SHIFT: 8aVj@x$'  
     MaskBits|=SHIFTBIT; w}?,N  
     break; 1~S'' [  
    default: //judge the key and send message fz rH}^  
     break; :MGIp%3  
   } =/ 19 -Y:  
   for(int index=0;index<MAX_KEY;index++) ;oOv~ YB7H  
   { EV_u8?va  
    if(hCallWnd[index]==NULL) /a\]Dwj5  
     continue; +< )H2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gyob q'o-  
    {  >1q:-^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5KW n>n  
     bProcessed=TRUE; 6>[J^k%~w)  
    } CIQ9dx7>  
   } \cQ+9e)  
  } bLO^5`6  
  if(!bProcessed){ ?}No'E1!I  
   for(int index=0;index<MAX_KEY;index++){ ygxaT"3"=  
    if(hCallWnd[index]==NULL) (]$&.gE.F  
     continue; Fyc":{Jd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A s8IjGNs{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <q=]n%nX  
   } v>5TTL~?  
  } d6A+pa'2  
 } 72dd%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *enT2Q  
} CL5t6D9Qi  
5oR)  
BOOL InitHotkey() 8|Wl|@1(  
{ $HAwd6NI  
 if(hHook!=NULL){ c22L]Sxo  
  nHookCount++; dl+c+w"  
  return TRUE; wdRk+  
 } >viLvDng  
 else |^O3~!JP(>  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); e*39/B0S  
  if(hHook!=NULL) JR|P]}  
   nHookCount++; LGWQBEXw  
  return (hHook!=NULL); T/q*k)IoR  
} 4TcW%  
BOOL UnInit() tw<}7l_>Au  
{ =!=DISPo  
 if(nHookCount>1){ g8]$BhRIfr  
  nHookCount--; Xliw(B'\a4  
  return TRUE; N._^\FRyn  
 } J:\O .F#Fi  
 BOOL unhooked = UnhookWindowsHookEx(hHook); jNAboSf2Y  
 if(unhooked==TRUE){ ki]i[cdk  
  nHookCount=0; on f7V  
  hHook=NULL; !uhh_3RH  
 } ($[@'?Z1  
 return unhooked; muKjeg'b  
} ^F-AZP /5F  
$~T|v7Y%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nW]T-!  
{ WU6F-{M"?  
 BOOL bAdded=FALSE; F ZfhiIf  
 for(int index=0;index<MAX_KEY;index++){ .WlZT-  
  if(hCallWnd[index]==0){ (o!i9)  
   hCallWnd[index]=hWnd; ":L d}~>  
   HotKey[index]=cKey; /[|A(,N}{  
   HotKeyMask[index]=cMask; s+a#x(7{  
   bAdded=TRUE; ~ \ Udl  
   KeyCount++; mnM$#%q;%  
   break; ];Y tw6A  
  } V.w!]{xm  
 } |L6 +e *  
 return bAdded; B`|H }KU  
} *4g:V;L  
@Cl1G  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k'K 1zUBj  
{ }Q_ }c9?  
 BOOL bRemoved=FALSE; ;uqi  
 for(int index=0;index<MAX_KEY;index++){ - S%8  
  if(hCallWnd[index]==hWnd){ K}Lu1:~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Sp@{5  
    hCallWnd[index]=NULL; e it%U  
    HotKey[index]=0; f:h<tlob  
    HotKeyMask[index]=0; !3Q^oR  
    bRemoved=TRUE; 5I0j>{U&  
    KeyCount--; <#e!kWGR?  
    break; U z MIm  
   } ( Uk\O`)m  
  } zmU>  
 } cnM`ywKW  
 return bRemoved; ^ ]SU (kY  
} rv %^2h<&  
]dnB ,  
void VerifyWindow() I(+%`{Wv  
{ 86~q pN  
 for(int i=0;i<MAX_KEY;i++){ _8OSDW*D5t  
  if(hCallWnd!=NULL){ 7niI65  
   if(!IsWindow(hCallWnd)){ Pol c.  
    hCallWnd=NULL; "XKd#ncP  
    HotKey=0; kj!mgu#T  
    HotKeyMask=0; nPjN\Es6  
    KeyCount--; <nF1f(ky  
   } &=l aZxe  
  } 9TV1[+JWe  
 } uG4Q\,R  
} '];=1loD  
JPkI+0  
BOOL CHookApp::InitInstance() kSO:xS0 _N  
{ ?^ `EI}g  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Med0O~T%  
 hins=AfxGetInstanceHandle(); ?yAjxoE~?  
 InitHotkey(); yo#fJ`  
 return CWinApp::InitInstance(); Ufe@G\uyI  
} >2K:O\&  
>~\CiV4^  
int CHookApp::ExitInstance() `MXGEJF  
{ <_-8)abK  
 VerifyWindow(); IHj9n>c)[  
 UnInit(); r~T3Ieb  
 return CWinApp::ExitInstance(); 41\V;yib  
} ?., 2EC=+  
w(nQ:;oC  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Y!AQ7F  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Yx<wYzD  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ m/NXifi8l  
#if _MSC_VER > 1000 {iVmae  
#pragma once xu* dPG)v  
#endif // _MSC_VER > 1000 PA>su)N$  
a9TKp$LP`  
class CCaptureDlg : public CDialog Eb9{  
{ hB-<GGcO <  
 // Construction M}`G}*  
 public: b "5WsJ:'#  
  BOOL bTray; `Qo}4nuRs  
  BOOL bRegistered; @]B 7(j<'R  
  BOOL RegisterHotkey(); C9E@$4*  
  UCHAR cKey; Ozs&YZ  
  UCHAR cMask; >A1;!kGE#  
  void DeleteIcon(); TAZ+2S##7  
  void AddIcon(); `rI[   
  UINT nCount; of?0 y-LT%  
  void SaveBmp(); firiYL"=44  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor )n17}Qm`V  
  // Dialog Data x|<89o L  
  //{{AFX_DATA(CCaptureDlg) #nJ&`woZt  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ixv/xI  
  CComboBox m_Key; -gb'DN1BG  
  BOOL m_bControl; T>pz?e^5&  
  BOOL m_bAlt; ^ot9Q  
  BOOL m_bShift; bGa "r  
  CString m_Path; pn4~?Aua0/  
  CString m_Number; /&G )IY]g  
  //}}AFX_DATA } OAH/BW  
  // ClassWizard generated virtual function overrides g+M& _n  
  //{{AFX_VIRTUAL(CCaptureDlg) ,SSq4  
 public: R%^AW2   
  virtual BOOL PreTranslateMessage(MSG* pMsg); S#^-VZ~U4x  
 protected: LkIbvJCV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [5QbE$  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -O?&+xIK&  
  //}}AFX_VIRTUAL J1{ucFa  
  // Implementation >X-*Hu'U#  
 protected: ,{u'7p  
  HICON m_hIcon; -K%~2M<  
  // Generated message map functions A0 1 D-)  
  //{{AFX_MSG(CCaptureDlg) wv_<be[?*  
  virtual BOOL OnInitDialog(); :]^FTnO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (TFo]c  
  afx_msg void OnPaint(); ex-W{k$  
  afx_msg HCURSOR OnQueryDragIcon(); 9>HCt*|_8  
  virtual void OnCancel(); nW `EBs  
  afx_msg void OnAbout(); TGu]6NzyZ  
  afx_msg void OnBrowse(); <Z8^.t)|  
  afx_msg void OnChange(); ]*JH~.p  
 //}}AFX_MSG 7.tEi}O&_g  
 DECLARE_MESSAGE_MAP() HVK./y qy  
}; :_"%o=  
#endif yaKw/vV  
}?XNA.Wz  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file n 0CS =  
#include "stdafx.h" r&c31k]E  
#include "Capture.h" Z7Xic5PI{4  
#include "CaptureDlg.h" eFdN"8EW  
#include <windowsx.h> WHvU|rJ  
#pragma comment(lib,"hook.lib") L% ?3VW  
#ifdef _DEBUG ##clReS  
#define new DEBUG_NEW XbKNH>  
#undef THIS_FILE Ba /^CS  
static char THIS_FILE[] = __FILE__; JLH,:2  
#endif /f) #CR0$  
#define IDM_SHELL WM_USER+1 It3.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mY !LGN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <<.%Gk  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 7__?1n~{  
class CAboutDlg : public CDialog >@c~M  
{ Y+'522er  
 public: gtV*`g  
  CAboutDlg(); 3&z.m/  
  // Dialog Data >gLLr1L\  
  //{{AFX_DATA(CAboutDlg) f6zS_y9gn  
  enum { IDD = IDD_ABOUTBOX }; JW-!m8  
  //}}AFX_DATA F(#~.i  
  // ClassWizard generated virtual function overrides AV*eGzz`  
  //{{AFX_VIRTUAL(CAboutDlg) m5rJY/  
 protected: !_SIq`5]@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #Bgq]6G2  
  //}}AFX_VIRTUAL  _F9O4Q4  
  // Implementation *QT|J6ng  
 protected: nH % 1lD?:  
  //{{AFX_MSG(CAboutDlg) mFXkrvOf,  
  //}}AFX_MSG K7N.gT*4  
  DECLARE_MESSAGE_MAP() a5xmIp@6  
}; "ZLujpZcG  
 @M E .  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #cD20t  
{ K?:wX(JYT  
 //{{AFX_DATA_INIT(CAboutDlg) O F CA~sR  
 //}}AFX_DATA_INIT v5N2$Sqp*  
} jwd{CN%  
&9F(uk=X  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8x9$6HO  
{ {IpIQ-@l  
 CDialog::DoDataExchange(pDX); e=%6\&q  
 //{{AFX_DATA_MAP(CAboutDlg) `[zd  
 //}}AFX_DATA_MAP ]~A<Q{  
} ?Ok@1  
2?bE2^6  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +|=5zWI /  
 //{{AFX_MSG_MAP(CAboutDlg) 7yK1Q_XY>  
 // No message handlers 8${Yu  
 //}}AFX_MSG_MAP `Ufv,_n  
END_MESSAGE_MAP() Vdz(\-}ao  
GxR, 3  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) qTl/bFD  
: CDialog(CCaptureDlg::IDD, pParent) U\\nSU  
{ ,@'M'S  
 //{{AFX_DATA_INIT(CCaptureDlg) xFY< ns  
  m_bControl = FALSE; ~1yMw.04V  
  m_bAlt = FALSE; tuiQk=[ c  
  m_bShift = FALSE; bn$}U.m$-  
  m_Path = _T("c:\\"); 11Hf)]M   
  m_Number = _T("0 picture captured."); tSvklI  
  nCount=0; U.B=%S  
  bRegistered=FALSE; {k}EWV  
  bTray=FALSE; j$8i!C  
 //}}AFX_DATA_INIT q T pvz  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {UR&Y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); J|BZ{T}d  
} VF<C#I  
6(X5n5C  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) >.-$?2  
{ t9Nu4yl  
 CDialog::DoDataExchange(pDX); * (4TasQu  
 //{{AFX_DATA_MAP(CCaptureDlg) Y/1,%8n  
  DDX_Control(pDX, IDC_KEY, m_Key); o-D,K dY  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Iu -CXc  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9IRvbE~2  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); _\tGmME37  
  DDX_Text(pDX, IDC_PATH, m_Path); GK/Q]}Q8pZ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); U8 b1 sz  
 //}}AFX_DATA_MAP 3koXM_4_{)  
} 3oCw(Ff  
", :Ta|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "n3i (sZ  
//{{AFX_MSG_MAP(CCaptureDlg) ;5.o;|w?!  
 ON_WM_SYSCOMMAND() 6!3Jr  
 ON_WM_PAINT() I:qfB2tL)O  
 ON_WM_QUERYDRAGICON() o,sw[  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) T"GuE[?a  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /@H2m\vBX  
 ON_BN_CLICKED(ID_CHANGE, OnChange) joN}N}U  
//}}AFX_MSG_MAP Z{w{bf1&A  
END_MESSAGE_MAP() "k${5wk#Fl  
[?$|   
BOOL CCaptureDlg::OnInitDialog() <9s=K\-  
{ f 2#9E+IQ  
 CDialog::OnInitDialog(); R "&(Ae?LR  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /Lc= K<  
 ASSERT(IDM_ABOUTBOX < 0xF000); 2z\4?HJy  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Uq,M\V \  
 if (pSysMenu != NULL) N&0MA  
 { Vd{h|=J  
  CString strAboutMenu; #NVqS5  
  strAboutMenu.LoadString(IDS_ABOUTBOX); WR*|kh  
  if (!strAboutMenu.IsEmpty()) YW}1iT/H  
  { Iy}r'#N  
   pSysMenu->AppendMenu(MF_SEPARATOR); $DfaW3bJ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); J\%<.S>  
  } V+dfV`*k  
 } P'Fy,fNg  
 SetIcon(m_hIcon, TRUE); // Set big icon hao0_9q+  
 SetIcon(m_hIcon, FALSE); // Set small icon x Qh?  
 m_Key.SetCurSel(0); a9E!2o+,  
 RegisterHotkey(); t|X |67W  
 CMenu* pMenu=GetSystemMenu(FALSE); h]94\XQ>$  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); rI:KZ}GZ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); k"P2J}4eO  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); O8+[ )+6^  
 return TRUE; // return TRUE unless you set the focus to a control 4JHQ^i-aY  
} Or9@X=C  
~EU[?  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,<lxq<1I  
{ OU(z};Is6Z  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ?CS jn  
 { kC R)k=*  
  CAboutDlg dlgAbout; \ooqa<_  
  dlgAbout.DoModal(); >5Zp x8W  
 } ^gFjm~2I  
 else 7F-b/AdVq  
 { 0<L@f=i  
  CDialog::OnSysCommand(nID, lParam); K.2M=Q  
 } %f;(  
} f*~ 4Kv  
%uGA+ \b  
void CCaptureDlg::OnPaint() @"s\eL,r  
{ t.pg;#  
 if (IsIconic()) Uc0AsUu}?  
 { Q:~w;I  
  CPaintDC dc(this); // device context for painting @2_s;!K  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +k"dN^K]D  
  // Center icon in client rectangle $ Yz &x%Lb  
  int cxIcon = GetSystemMetrics(SM_CXICON); HHZ!mYr  
  int cyIcon = GetSystemMetrics(SM_CYICON); kXC.rgal  
  CRect rect; bE>3D#V<  
  GetClientRect(&rect); ABV\:u  
  int x = (rect.Width() - cxIcon + 1) / 2; ,l<-*yMD  
  int y = (rect.Height() - cyIcon + 1) / 2; z1+rz%  
  // Draw the icon 1#qCD["8  
  dc.DrawIcon(x, y, m_hIcon); LM'` U-/e$  
 } e #^|NQ<'A  
 else Z"? AaD[  
 { Za!c=(5  
  CDialog::OnPaint(); DuvP3(K  
 } ud:?~?j&w  
} U30)r+&  
^TWN_(-@  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~rCnST  
{ n@L!{zY  
 return (HCURSOR) m_hIcon; l7{hq}@;cC  
} +>qBK}`  
)O- x1U  
void CCaptureDlg::OnCancel() %FFw!eVi  
{ FA^x|C=$  
 if(bTray) ~+7yi4(i  
  DeleteIcon(); g}^ /8rW  
  CDialog::OnCancel(); /&j4IlT  
} Xs?7Whc6  
zF i+6I$  
void CCaptureDlg::OnAbout() TiBE9  
{ ;oFaDTX]  
 CAboutDlg dlg; 0h shHv-  
 dlg.DoModal(); *gz{:}NX  
} xN"KSQpu  
\Di~DN1  
void CCaptureDlg::OnBrowse() pjj 5  
{ G^mk<pH  
 CString str; 'v|2} T*  
 BROWSEINFO bi; ^RWt  
 char name[MAX_PATH]; P'9aZd  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); o m_&|9B)  
 bi.hwndOwner=GetSafeHwnd(); h.=B!wKK  
 bi.pszDisplayName=name; uWnS<O  
 bi.lpszTitle="Select folder"; &< Gq-IN  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 1]>KuXd r  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); IPxfjBC+J  
 if(idl==NULL) l!AZ$IV  
  return; u F*cS&'Z  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ex!^&7Q(  
 str.ReleaseBuffer(); `4EOy:a  
 m_Path=str; z~ u@N9M  
 if(str.GetAt(str.GetLength()-1)!='\\') !RcAJs'  
  m_Path+="\\"; T (2,iG8  
 UpdateData(FALSE); y]jh*KD[  
} Mz++SPG7  
j [U0,]  
void CCaptureDlg::SaveBmp() c?R.SBr,'  
{ _TPo=}Z  
 CDC dc; jATU b-  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); H4:TYh  
 CBitmap bm; DpS6>$v8t  
 int Width=GetSystemMetrics(SM_CXSCREEN); o mjLQp[%  
 int Height=GetSystemMetrics(SM_CYSCREEN); rFy9K4D  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Na~_=3+a  
 CDC tdc; wO!hVm,T a  
 tdc.CreateCompatibleDC(&dc); {hg$?4IyQ  
 CBitmap*pOld=tdc.SelectObject(&bm); c&Zm>Qo[  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); g?$9~/h :;  
 tdc.SelectObject(pOld); }"&(sYQ*`  
 BITMAP btm; Ro1' L1:  
 bm.GetBitmap(&btm); 17i^|&J6}:  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *Yr-:s9J9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); xY'g7<})$  
 BITMAPINFOHEADER bih; ,xh9,EpBk  
 bih.biBitCount=btm.bmBitsPixel; fcZOsTj  
 bih.biClrImportant=0; t!u*6 W|@  
 bih.biClrUsed=0; S-/ #3  
 bih.biCompression=0; blN1Q%m6  
 bih.biHeight=btm.bmHeight; Qx,G3m[}  
 bih.biPlanes=1; .4Ny4CMHZ  
 bih.biSize=sizeof(BITMAPINFOHEADER); o7T|w~F~R  
 bih.biSizeImage=size; 1 I+5  
 bih.biWidth=btm.bmWidth; :> q?s  
 bih.biXPelsPerMeter=0; g^C6"rsnl  
 bih.biYPelsPerMeter=0; (KQt%]  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); OXacI~C  
 static int filecount=0; *(scSC>  
 CString name; ]Cz16e&=2  
 name.Format("pict%04d.bmp",filecount++); aBI]' D;  
 name=m_Path+name; >Qx#2x+  
 BITMAPFILEHEADER bfh; "|G,P-5G"  
 bfh.bfReserved1=bfh.bfReserved2=0; ^]DWrmy  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @Hf }PBb  
 bfh.bfSize=54+size; k`AJ$\=  
 bfh.bfOffBits=54; Td  F<  
 CFile bf; %xfy\of+Nk  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ j&Aq^aI  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `/AzX *`  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 72,iRH  
  bf.WriteHuge(lpData,size); $ vjmW! O  
  bf.Close(); $~YuS_sYg  
  nCount++; c~'kW`sNV  
 } @iRVY|t/  
 GlobalFreePtr(lpData); 2bJFlxEU  
 if(nCount==1) c'B"Onu@m*  
  m_Number.Format("%d picture captured.",nCount); "n6Y^  
 else l =yHx\  
  m_Number.Format("%d pictures captured.",nCount); 9A_7:V]_  
  UpdateData(FALSE); /)I9+s#q9o  
} vvM)Rb,  
6-=_i)kzq  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }gW}Vr <  
{ 7asq]Y}<  
 if(pMsg -> message == WM_KEYDOWN) XJzXxhk2  
 { ".)_kt[  
  if(pMsg -> wParam == VK_ESCAPE) O$H150,Q  
   return TRUE; `-H:j:U{  
  if(pMsg -> wParam == VK_RETURN) YzZF^q^I  
   return TRUE; .HBvs=i  
 } (6BCFl:/Q<  
 return CDialog::PreTranslateMessage(pMsg); *e6|SZ &3  
} cBI )?  
%8L<KJd  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  mb/[2y<  
{ ffM(il/2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5G<CDgl^!  
  SaveBmp(); 4cQ5E9  
  return FALSE; mvgm o  
} Flxo%g};  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `0^i #  
 CMenu pop; *jK))|%  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); vs. uq  
 CMenu*pMenu=pop.GetSubMenu(0); HUC2RM?FN  
 pMenu->SetDefaultItem(ID_EXITICON); cWc)sb  
 CPoint pt; $P(nh'\  
 GetCursorPos(&pt); #FB>}:L{h*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); [!&k?.*;<  
 if(id==ID_EXITICON) A,{D9-%  
  DeleteIcon(); xiF%\#N  
 else if(id==ID_EXIT) M: "ci;*$  
  OnCancel(); zcKC5vqb  
 return FALSE; ElXe=5L\#  
} 6 b}feEh$!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ' D&G~$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Qm#i"jvV  
 AddIcon(); #'x?) AS  
 return res; WQpJd7  
} :6?&FzD`  
3- bcY4  
void CCaptureDlg::AddIcon() 2]9<%-=S  
{ U_- K6:tr  
 NOTIFYICONDATA data; kkBU<L2  
 data.cbSize=sizeof(NOTIFYICONDATA); 2Nkn C>9(\  
 CString tip; @'*#]YU8  
 tip.LoadString(IDS_ICONTIP); y.:-  
 data.hIcon=GetIcon(0); $-]setdY  
 data.hWnd=GetSafeHwnd(); ^,K.)s  
 strcpy(data.szTip,tip); 8uxFXQ  
 data.uCallbackMessage=IDM_SHELL; 5{q/z^]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; WdqK/s<jM  
 data.uID=98; j#,M@CE  
 Shell_NotifyIcon(NIM_ADD,&data); 6B/"M-YME  
 ShowWindow(SW_HIDE); d;SRK @  
 bTray=TRUE; z8|9WZ:  
}  -C  ON  
p qN[G=0  
void CCaptureDlg::DeleteIcon() %"Q!5qH&  
{ P$/A!r  
 NOTIFYICONDATA data; TDIOK  
 data.cbSize=sizeof(NOTIFYICONDATA); a{HgIQg_>R  
 data.hWnd=GetSafeHwnd(); s|r7DdI  
 data.uID=98; W 'a~pB1I  
 Shell_NotifyIcon(NIM_DELETE,&data); +Nbk\%  
 ShowWindow(SW_SHOW); f_h"gZWV  
 SetForegroundWindow(); !7`=rT&  
 ShowWindow(SW_SHOWNORMAL); 'uAC oME@  
 bTray=FALSE; 8ex:OTzn|  
} 2{kfbm-89t  
UT<b v}(J  
void CCaptureDlg::OnChange() Qz)8eIO:  
{ 0D3+R1>_D  
 RegisterHotkey(); k*3_) S -  
} %4|}&,%%r  
^P g YP  
BOOL CCaptureDlg::RegisterHotkey() ,XG|oo -  
{ @\`G & VB  
 UpdateData(); q4GW=@eD  
 UCHAR mask=0; DgT.Lku?  
 UCHAR key=0; $;i$k2n:  
 if(m_bControl) 60%~+oHi~  
  mask|=4; T:%wX9W  
 if(m_bAlt) PnIvk]"Ab  
  mask|=2; #D/ }u./  
 if(m_bShift) uU(G_E ?  
  mask|=1; :.[5('  
  key=Key_Table[m_Key.GetCurSel()]; p5;,/ |Ft  
 if(bRegistered){ w+9C/U;|s  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); J=SB/8tQ)T  
  bRegistered=FALSE; a-A+.7  
 } c w]>a&d  
 cMask=mask; K'5sn|)  
 cKey=key; mz$Wo *FB  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); =R;1vUio  
 return bRegistered; {9.~]dI|L  
} ,cy/fW  
_Kl{50}]  
  四、小结 bOSYr<R&  
>)J47j7{c  
  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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