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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: HJ4T! `'d  
  anDwv }  
  一、实现方法 i-1lppI  
 mZGAl1`8  
  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: 5G5P#<Vv  
zTA+s 2  
#pragma data_seg("shareddata") 0 *!CJ;%N  
HHOOK hHook =NULL; //钩子句柄 ]2O52r  
UINT nHookCount =0; //挂接的程序数目 @JJ,$ ?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 hcWYz  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 <1")JDW  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey },r30`)Q  
static int KeyCount =0; :cDhqBMNr`  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 <}e2\x  
#pragma data_seg() fTQ_miAlP  
IQn|0$':Z  
  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。 kb"g  
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  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: "},0Cs  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR X|o;*J](  
cKey,UCHAR cMask) b| e7mis@  
{ <ezv  
 BOOL bAdded=FALSE; $|J16tW  
 for(int index=0;index<MAX_KEY;index++){ 5/U|oZM"  
  if(hCallWnd[index]==0){ {NmpTb  
   hCallWnd[index]=hWnd; <'s_3AC  
   HotKey[index]=cKey; 8?p40x$m%  
   HotKeyMask[index]=cMask; %V r vu5  
   bAdded=TRUE; :|j,x7&/{  
   KeyCount++; 21(8/F ~{  
   break; hC1CISm.U  
  } )ro3yq4??  
 } |Z\?nZ~  
 return bAdded; o }EipTL  
} >%qk2h>  
//删除热键 "9mVBa|Q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) DeqTr:  
{ 8sMDe'  
 BOOL bRemoved=FALSE; +7yirp~`K  
 for(int index=0;index<MAX_KEY;index++){ &)(>e}es  
  if(hCallWnd[index]==hWnd){ 2|="!c8K  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9  Vn  
    hCallWnd[index]=NULL; ZUDdLJ  
    HotKey[index]=0; f~U~f}Uw4  
    HotKeyMask[index]=0; AH*{Bi[vX  
    bRemoved=TRUE; U5rcI6  
    KeyCount--; +|Tz<\.C  
    break; ?-'m#5i"  
   } /-Saz29f^Q  
  } OnD!*jy  
 } (_:k s  
 return bRemoved; QU`M5{#  
} NO(^P+s  
93Z/|7  
f?KHp|  
  DLL中的钩子函数如下: DV={bcQ  
a/})X[2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) *,C[yg1P  
{ }b$?t7Q)  
 BOOL bProcessed=FALSE; e_eNtVq  
 if(HC_ACTION==nCode) j$2rU'  
 { cJ CKxj  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 kzMul<>sl  
   switch(wParam) %[1\d)  
   {  U<T.o0s=  
    case VK_MENU: C!]R0L*  
     MaskBits&=~ALTBIT; JnC$}amr  
     break; /O,>s  
    case VK_CONTROL: (#|CL/&  
     MaskBits&=~CTRLBIT; f9+J}  
     break; j41)X'MgJ  
    case VK_SHIFT: M4%u~Z:4h+  
     MaskBits&=~SHIFTBIT; B8XW+U  
     break; A`|Z2  
    default: //judge the key and send message s& INcjC  
     break; (lNV\Za  
   } E5^P*6c(  
   for(int index=0;index<MAX_KEY;index++){  O=,[u?  
    if(hCallWnd[index]==NULL) _J|TCm  
     continue;  [#+yL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |@84l  
    { l|, Hj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); o'oA.'ul  
     bProcessed=TRUE; (8Q0?SZN  
    } % oPt],>  
   } {P'_s ]B)  
  } d|P,e;m-  
  else if((lParam&0xc000ffff)==1){ //有键按下 W^a-K  
   switch(wParam) VR8 kY&  
   { 74[wZDW|(  
    case VK_MENU: S JseP_-  
     MaskBits|=ALTBIT; e(e_p#  
     break; x.5!F2$  
    case VK_CONTROL: 7P+qPcRaP  
     MaskBits|=CTRLBIT; JEw+5 MO@  
     break; 4tQ~Z6Jn;  
    case VK_SHIFT: *3uBS2Ld  
     MaskBits|=SHIFTBIT; > whcZ.8  
     break; %anY'GK   
    default: //judge the key and send message fU6O:-  
     break; jTR>H bh  
   } }9Th`   
   for(int index=0;index<MAX_KEY;index++){ (D.B'V#>  
    if(hCallWnd[index]==NULL) :,@"I$>*/  
     continue; q=EHB5!q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A` 'k5uG  
    { `u<\ 4&W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G_vcuCHm  
     bProcessed=TRUE; @3^D[  
    } ?%|w?Fdx-  
   } 2HNAB4 E  
  } >,Z[IAU.x5  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 9\QeH'A  
   for(int index=0;index<MAX_KEY;index++){ uwL^Tq}Yh  
    if(hCallWnd[index]==NULL) cuw 7P  
     continue; e9LP!"@EY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %>z4hH,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %9 q]  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 F K7cDaI  
   } |)Q#U$ m  
  } 6#J>b[Q  
 } gwA+%]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); N$!aP/b  
} }Wk^7[Y  
qG6?k}\\  
  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: TR<M3,RG#%  
G!u+~{g  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f:\)oIW9Kk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  46^9O 5J  
Y94 ^mt-  
  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: ?M/H{  
}&*wJ]j`L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *(,zPn,  
{ 5[[mS  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]ZMFK>"^%  
 { ~E8L,h~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #J Ay  
  SaveBmp(); eP?=tUB!S  
  return FALSE; ir{li?kV  
 }  ?W3l  
 …… //其它处理及默认处理 mTj ?W$+r  
} } SNZl`>  
xg^Z. q)d  
O)aWTI  
  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。 rA\6y6dFs  
|zkZF|-  
  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。 zao=}j?  
@^2?97i c  
  二、编程步骤 O x),jc[/  
u_Wftb?9  
  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"; {vhP'!a6W  
> u!# 4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; yrF"`/zv6|  
6CV9ewr  
  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; m]?C @ina  
n^t!+  
  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; D}MCVNd^  
lEYAq'=  
  5、 添加代码,编译运行程序。 S;8gX1Uf  
W]CsKN,K  
三、程序代码 3J_B uMV  
(-[73v-w  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL F1q6 3  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) tkX?iqKQ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ s=H| ^v  
#if _MSC_VER > 1000 8#{DBWU  
#pragma once Yo*.? Mq'  
#endif // _MSC_VER > 1000 E]0}&YG  
#ifndef __AFXWIN_H__ QFNw2:)  
#error include 'stdafx.h' before including this file for PCH [["az'Lrk?  
#endif PB(q9gf"1}  
#include "resource.h" // main symbols \Q!I;  
class CHookApp : public CWinApp k0v&U@+-J  
{ fe4Ki  
 public: h]jy):9L  
  CHookApp(); a;h.I}*]  
  // Overrides ZnAXb S  
  // ClassWizard generated virtual function overrides wj{[g^y%  
  //{{AFX_VIRTUAL(CHookApp) >+FaPym  
 public: di4>Ir~]  
  virtual BOOL InitInstance(); M(Tlkr  
  virtual int ExitInstance(); 'JRYf;9c  
  //}}AFX_VIRTUAL >X_5o^s2s  
  //{{AFX_MSG(CHookApp) m#,AD,s  
  // NOTE - the ClassWizard will add and remove member functions here. \|YIuzlO4  
  // DO NOT EDIT what you see in these blocks of generated code ! :V!F~  
  //}}AFX_MSG =v{Vl5&>?  
  DECLARE_MESSAGE_MAP() ,<t)aZL,A;  
}; Tl!}Rw~Pg  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ["1Iz{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); };;k5z I%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9SQc ChG~j  
BOOL InitHotkey(); fZgEJsr  
BOOL UnInit(); P^57a?[`  
#endif ' 4.T1i,  
f 0r?cZ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ?p'DgL{  
#include "stdafx.h" w(oi6kg  
#include "hook.h" mXOY,g2w  
#include <windowsx.h> U}R (  
#ifdef _DEBUG V0G"Z6  
#define new DEBUG_NEW +GvPJI  
#undef THIS_FILE x(+H1D\W   
static char THIS_FILE[] = __FILE__; XI\P#"  
#endif >e^^YR^  
#define MAX_KEY 100 DS|q(O=7~t  
#define CTRLBIT 0x04 OsV'&@+G>  
#define ALTBIT 0x02 O8k+R@  
#define SHIFTBIT 0x01 FaLc*CU  
#pragma data_seg("shareddata") +`f3_Xd  
HHOOK hHook =NULL; <lgX=wx L  
UINT nHookCount =0; vLs*}+f  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey s# V>+mU  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT /^sk y!  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey rHp2I6.0a  
static int KeyCount =0; A4daIhP (  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Dnp><%  
#pragma data_seg() )dfwYS*[n  
HINSTANCE hins; K"jS,a?s 6  
void VerifyWindow(); P$zhMnAAN  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) hf\/2Vl  
//{{AFX_MSG_MAP(CHookApp) uE,g|51H/  
// NOTE - the ClassWizard will add and remove mapping macros here. tF:AqR: (~  
// DO NOT EDIT what you see in these blocks of generated code! w_P2\B^  
//}}AFX_MSG_MAP `hf`lq^  
END_MESSAGE_MAP() (>SucUU  
T h!;zu^t  
CHookApp::CHookApp() -<l2 $&KS  
{ Wi@YJ  
 // TODO: add construction code here, oV'G67W  
 // Place all significant initialization in InitInstance I+/fX0-Lib  
} JqV}>"WMV  
fb8)jd'~}O  
CHookApp theApp; Om(Ir&0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) J,*+Ak ~  
{ hr W2#v  
 BOOL bProcessed=FALSE; q.bx nta"  
 if(HC_ACTION==nCode) $kBcnk  
 { 3}lIY7 O  
  if((lParam&0xc0000000)==0xc0000000){// Key up V-9\@'gc  
   switch(wParam) .Vrl:  
   { OCELG~  
    case VK_MENU: no(or5UJ  
     MaskBits&=~ALTBIT; @~bP|a  
     break; t 7D~JAx6  
    case VK_CONTROL: FEdFGT  
     MaskBits&=~CTRLBIT; @rS(3wu_&  
     break; 7U!-_)n{  
    case VK_SHIFT: U%n>(!d  
     MaskBits&=~SHIFTBIT; >U)>~SQf  
     break; P~;1adi3  
    default: //judge the key and send message "hnvND4=  
     break; /\MkH\zg  
   } .=zBUvy  
   for(int index=0;index<MAX_KEY;index++){ lS]6Sk Z6  
    if(hCallWnd[index]==NULL) /vI"v 4  
     continue; k8b5~A,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0ev='v8?  
    { av bup  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); j&[u$P*K  
     bProcessed=TRUE; ~KczP1p  
    } 3e9UDN2  
   } m=25HH7enb  
  } ^% L;FGaA  
  else if((lParam&0xc000ffff)==1){ //Key down hi/Z>1ZOX  
   switch(wParam) (aLjW=  
   { n&2OfBJ  
    case VK_MENU: tgj 5l#P  
     MaskBits|=ALTBIT; LIll@2[  
     break; F!g;}_s9  
    case VK_CONTROL: P$.$M}rMv  
     MaskBits|=CTRLBIT; &crR nv ?  
     break; K >Q 6  
    case VK_SHIFT: OAaLCpRp  
     MaskBits|=SHIFTBIT; Dq-[b+bm  
     break; &W3Hj$>  
    default: //judge the key and send message 49ehj1Se  
     break; WmkCV+thA  
   } J:@yG1VIp  
   for(int index=0;index<MAX_KEY;index++) %2\6.c=c  
   { b94+GL U8b  
    if(hCallWnd[index]==NULL) c-"vQ>ux+  
     continue; = |E8z u%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &eb8k2S  
    { s>)?MB*vb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); OC)=KV@KE  
     bProcessed=TRUE; `I8ep=VZ  
    } ^<_rE-k  
   } CjEzsjqe<I  
  } ' g d=\gV  
  if(!bProcessed){ vl~HV8MAv  
   for(int index=0;index<MAX_KEY;index++){ UW1i%u k  
    if(hCallWnd[index]==NULL) 51-'*Y  
     continue; -f*5lkO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |;\pAZ2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); y&/bp<Z  
   } [hV}$0#E[O  
  } ]WK~`-3C^  
 } J50n E~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); cG&@PO]+.  
} hcM9Sx"!  
2B^WZlx  
BOOL InitHotkey() kgI8PybY  
{ @?RaU4e  
 if(hHook!=NULL){ }$[@*  
  nHookCount++;  T\#Gc4  
  return TRUE; jrpki<D  
 } 8n["/5,  
 else ^\[c][fo  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); N,UUM|?9_  
  if(hHook!=NULL) "MK2QIo  
   nHookCount++; $)~:H-  
  return (hHook!=NULL); ,& wd  
} ]^8CtgC  
BOOL UnInit() {-Gh 62hDg  
{ &DjA?0`J  
 if(nHookCount>1){ bk&kZI.D  
  nHookCount--; #=)!\   
  return TRUE; dc0&*/`:  
 } ^rd%{ 6m  
 BOOL unhooked = UnhookWindowsHookEx(hHook); GQjwr(  
 if(unhooked==TRUE){ RI+Y+z  
  nHookCount=0; Z>l|R C  
  hHook=NULL; @6Lp $w  
 } W)'*Dcd  
 return unhooked; xm5?C>vu(  
} KyQTrl.qdl  
x$t2Y<_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q}cti /  
{ (BngwLVDK  
 BOOL bAdded=FALSE; ^Ku]8/ga  
 for(int index=0;index<MAX_KEY;index++){ 6=Wevb5YJ  
  if(hCallWnd[index]==0){ ?:&2iW7z  
   hCallWnd[index]=hWnd; \RtFF  
   HotKey[index]=cKey; 'nq~1 >i  
   HotKeyMask[index]=cMask; io(!z-$  
   bAdded=TRUE; +SE\c  
   KeyCount++; V7`vLs-  
   break; 1GIBqs~-  
  } ;<mcvm  
 } OjNOvh&N  
 return bAdded;  NEPK   
} @!j6y (@  
on"ENT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8B]\;m  
{ *&\6x}.I4  
 BOOL bRemoved=FALSE; c##tP*(  
 for(int index=0;index<MAX_KEY;index++){ z}B8&*>  
  if(hCallWnd[index]==hWnd){ +v'2s@e` #  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Zy.A9 Bh~  
    hCallWnd[index]=NULL; WW+ F9~S  
    HotKey[index]=0; 2b,edJVt?  
    HotKeyMask[index]=0; s diWQv  
    bRemoved=TRUE; =HJ7tele  
    KeyCount--; 3aBE[  
    break; }s:3_9mE  
   } zb4{nzX=  
  } 5`$!s17  
 } Ihr[44#  
 return bRemoved; )MLbE-@  
} 2+?W{yAEi  
-T i<H9OV  
void VerifyWindow() hOkn@F.  
{ <RpTk*Yo^=  
 for(int i=0;i<MAX_KEY;i++){ $}0!dR2  
  if(hCallWnd!=NULL){ e@;'#t  
   if(!IsWindow(hCallWnd)){ y\(xYB>T  
    hCallWnd=NULL; hoM%|,0  
    HotKey=0; w{lj'3z I  
    HotKeyMask=0; aMxj{*v7  
    KeyCount--; &j ; 91wEn  
   } UjLq[,_!  
  } gm n b  
 } n qx0#_K-E  
} 0%%y9;o  
|(TEG.<g  
BOOL CHookApp::InitInstance() 6uKth mr  
{ W(Md0*   
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); jcvq:i{  
 hins=AfxGetInstanceHandle(); \ltS~E uWU  
 InitHotkey(); oM^vJ3  
 return CWinApp::InitInstance(); ?Q+*[YEJ5  
} |pbetA4&  
lZe-A/E  
int CHookApp::ExitInstance() bA2[=6  
{ tS5J{j>T  
 VerifyWindow(); `8#xO{B1  
 UnInit(); xdDe@G;"  
 return CWinApp::ExitInstance(); vJct)i  
} ZR0 OqSp]  
k%\y,b*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2A =Y  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :xq{\"r  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ i `p1e5$  
#if _MSC_VER > 1000 !>ZBb\EyK  
#pragma once #H4<8B  
#endif // _MSC_VER > 1000 [{#T N  
 b{)kup  
class CCaptureDlg : public CDialog 0-aaLC~Z>  
{ |+JO]J#bc  
 // Construction oOLA&N-A~  
 public: 8''1H<f  
  BOOL bTray; v$x)$/]n  
  BOOL bRegistered; cyP+a  
  BOOL RegisterHotkey(); ?/5<}W#7}  
  UCHAR cKey; J}4RJ9  
  UCHAR cMask; xXI WEZA  
  void DeleteIcon(); vN@04a\h  
  void AddIcon(); N+5f.c+S-  
  UINT nCount; {R[V  
  void SaveBmp(); <0hVDk~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor =h=-&DSA  
  // Dialog Data #lSGH 5Fp?  
  //{{AFX_DATA(CCaptureDlg) >ifys)wg>  
  enum { IDD = IDD_CAPTURE_DIALOG }; zVe,HKF/  
  CComboBox m_Key; "}%j'  
  BOOL m_bControl; $sb@*K}:4  
  BOOL m_bAlt; -kP2Brm  
  BOOL m_bShift; 9-&@Y  
  CString m_Path; TNeL%s?B3  
  CString m_Number; @"98u$5  
  //}}AFX_DATA $AvaOI.l  
  // ClassWizard generated virtual function overrides p`Tl)[*  
  //{{AFX_VIRTUAL(CCaptureDlg) Y#-c<o}f  
 public: `('Up?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <nV3`L&]  
 protected: qJK9C `T%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8@rF~^-_  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); OI:=>Bk  
  //}}AFX_VIRTUAL -Gl!W`$I `  
  // Implementation l ObY  
 protected: N!v>2"x8q  
  HICON m_hIcon; #a9R3-aP  
  // Generated message map functions Z$m&F0g  
  //{{AFX_MSG(CCaptureDlg) (r'NB  
  virtual BOOL OnInitDialog(); &Q\k`0vzVB  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); H.l WHM+H4  
  afx_msg void OnPaint(); A]o3 MoSt  
  afx_msg HCURSOR OnQueryDragIcon(); ~j!|(a7  
  virtual void OnCancel(); Sn.I{~  
  afx_msg void OnAbout(); /z)8k4  
  afx_msg void OnBrowse(); U}=H1f,  
  afx_msg void OnChange(); 6OQ\f,h@  
 //}}AFX_MSG AI9=?X<kh  
 DECLARE_MESSAGE_MAP() ;t@^Z_z,CR  
}; ashVV~\8A  
#endif (15.?9  
,>TDxI;  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 5:EE%(g9  
#include "stdafx.h" Nk F2'Z{$+  
#include "Capture.h" %V!!S#W  
#include "CaptureDlg.h" dGR #l)  
#include <windowsx.h> (51;cj>J  
#pragma comment(lib,"hook.lib") g^\>hjNX  
#ifdef _DEBUG x_4{MD^%  
#define new DEBUG_NEW n!NA}Oa  
#undef THIS_FILE  Zzr  
static char THIS_FILE[] = __FILE__; 4%TmW/yd  
#endif 2qKAO/_O  
#define IDM_SHELL WM_USER+1 G#'G9/Tm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *vzj(HGO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k.H4Mf(4  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; C\ cZ  
class CAboutDlg : public CDialog zfGr1;  
{ ]}_Ohe]X  
 public: gGbqXG^  
  CAboutDlg(); u)P)r,  
  // Dialog Data `M_w^&6+n  
  //{{AFX_DATA(CAboutDlg) %9t=Iu*  
  enum { IDD = IDD_ABOUTBOX }; 6" . v6  
  //}}AFX_DATA <<1_rRL]  
  // ClassWizard generated virtual function overrides ~~WX#Od*$  
  //{{AFX_VIRTUAL(CAboutDlg) f{D~ZC.*  
 protected: kAoh#8=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *AYjMCo  
  //}}AFX_VIRTUAL :Ui'x8yt  
  // Implementation u$x'P <b  
 protected: o-]8)G>~M  
  //{{AFX_MSG(CAboutDlg) o1<Z; 2#  
  //}}AFX_MSG Xkp`1UTH  
  DECLARE_MESSAGE_MAP() \Q,5Ne'o  
}; *eUxarI  
"LVN:|!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +n<;);h  
{ 45Q#6Bt E  
 //{{AFX_DATA_INIT(CAboutDlg) 2|8$@*-\  
 //}}AFX_DATA_INIT k jR-p=}  
} hB]<li)"C  
Ng1[y4R}  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) X.ZY1vO  
{ Z3A"GWY  
 CDialog::DoDataExchange(pDX); -/6Ms%O  
 //{{AFX_DATA_MAP(CAboutDlg) 5 |oi*b  
 //}}AFX_DATA_MAP B]cV|S|  
} ]-u>HO g\  
]i'gU(+;`  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) I%ZSh]On  
 //{{AFX_MSG_MAP(CAboutDlg) "eKM<S  
 // No message handlers BH?fFe&J:`  
 //}}AFX_MSG_MAP K%>3ev=y.s  
END_MESSAGE_MAP() 1f5;^T I  
th|TwD&mO  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ebB8.(k9G3  
: CDialog(CCaptureDlg::IDD, pParent) YR68'Sft[  
{ GG`;c?d@  
 //{{AFX_DATA_INIT(CCaptureDlg) =xHzhh  
  m_bControl = FALSE; 7C^W<SUo  
  m_bAlt = FALSE; '\B!1B>T  
  m_bShift = FALSE; +}!FP3KgT  
  m_Path = _T("c:\\"); |f"1I4K g  
  m_Number = _T("0 picture captured."); lO^YAOY  
  nCount=0; K>`*JJ,  
  bRegistered=FALSE; Cv1CRmqq%  
  bTray=FALSE; dIvvJk8  
 //}}AFX_DATA_INIT 3=kw{r[2lM  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 WLN;LT  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); zB)wY KwZ  
} ::G0v  
mF] 8  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~C;gEE-  
{ EcmyY,w  
 CDialog::DoDataExchange(pDX); 1cPjgBxv#  
 //{{AFX_DATA_MAP(CCaptureDlg) 'tzN.p1O  
  DDX_Control(pDX, IDC_KEY, m_Key); Q!}LtR$  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); hk+"c^g:j<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); si>gYO  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {DGnh1  
  DDX_Text(pDX, IDC_PATH, m_Path); *[wj )  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5B+I\f&  
 //}}AFX_DATA_MAP q#1Cm Kt4R  
} zvP>8[   
#jR1ti)p  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *6 P)HU@  
//{{AFX_MSG_MAP(CCaptureDlg) {(qH8A  
 ON_WM_SYSCOMMAND() Qx}hiv/  
 ON_WM_PAINT() &+F}$8,  
 ON_WM_QUERYDRAGICON() \"hP*DJ"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -#"7F:N1  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) {,CvWL  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Sc3B*.  
//}}AFX_MSG_MAP W2j@Q=YDS  
END_MESSAGE_MAP() C*,PH!$k  
_8nT$!\\  
BOOL CCaptureDlg::OnInitDialog() +h? z7ZY^  
{ _f~m&="T!  
 CDialog::OnInitDialog(); iQ_^MzA  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); } {m.\O  
 ASSERT(IDM_ABOUTBOX < 0xF000); g|V0[Hnq6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); YXjWk),  
 if (pSysMenu != NULL) TP&&' 4?D1  
 { S.A|(?x  
  CString strAboutMenu; ! V;glx[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); >>HC|  
  if (!strAboutMenu.IsEmpty()) >qjV(_?F-  
  { [i)G:8U  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9jTm g%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5!^DKyw:  
  } RI64QD  
 } 1q;r4$n  
 SetIcon(m_hIcon, TRUE); // Set big icon l>:\% ol  
 SetIcon(m_hIcon, FALSE); // Set small icon wZ =*ejo  
 m_Key.SetCurSel(0); K+J fU J  
 RegisterHotkey(); Luu.p<   
 CMenu* pMenu=GetSystemMenu(FALSE); #sp8 !8|y  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 2XGbqZj  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); i5^U1K\M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); W8{zV_TBm  
 return TRUE; // return TRUE unless you set the focus to a control 0ud>oh4WPR  
} 2w? 5vSv  
OLM}en_L  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0] $5jW6]  
{ /N82h`\n  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 0I@Cx {$  
 { ac??lHtH9  
  CAboutDlg dlgAbout; `SSUQ#@  
  dlgAbout.DoModal(); rCdf*;  
 } bv8GJ #  
 else sOLR*=F{  
 { &24z`ZS[w6  
  CDialog::OnSysCommand(nID, lParam); h9 &V   
 } nH^RQ'19  
} F|t_&$Is?  
d9sqO9Ud8  
void CCaptureDlg::OnPaint() t.E3Fh!o  
{ 0ge^p O\Z  
 if (IsIconic()) d8Kxtg Y  
 { =C.WM*='  
  CPaintDC dc(this); // device context for painting =3Hv  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Um'r6ty  
  // Center icon in client rectangle !4l\*L  
  int cxIcon = GetSystemMetrics(SM_CXICON); ``4lomz>  
  int cyIcon = GetSystemMetrics(SM_CYICON); xg2 &  
  CRect rect; Ghpk0ia%d  
  GetClientRect(&rect); eEG]JH  
  int x = (rect.Width() - cxIcon + 1) / 2; gELb(Y\ak  
  int y = (rect.Height() - cyIcon + 1) / 2; <"XDIvpc%L  
  // Draw the icon F"M$ "rC]  
  dc.DrawIcon(x, y, m_hIcon); +O,h<* y  
 } =q-HR+  
 else Rr>h8Ni <  
 { hPHrq{YZ  
  CDialog::OnPaint(); Du2v,n5@  
 } !HP/`R  
} P?P))UB5  
Ho:X.Z9A^  
HCURSOR CCaptureDlg::OnQueryDragIcon() 8^Ov.$rP  
{ aY7.<p*a  
 return (HCURSOR) m_hIcon; HGjGV]N5  
} #Qp.O@e  
P7iU_CgyW  
void CCaptureDlg::OnCancel() gwepaW  
{ eZWR)+aq  
 if(bTray) @j Y_^8#S  
  DeleteIcon(); W^^}-9  
  CDialog::OnCancel(); |ozlaj  
} uJ!yM;{+  
wzRIvm{  
void CCaptureDlg::OnAbout() Q5s?/r  
{ Xqac$%[3  
 CAboutDlg dlg; S(f V ,;Z  
 dlg.DoModal(); Lx"a#rZ  
} 4{r_EV[(  
q;V1fogqI)  
void CCaptureDlg::OnBrowse() bu2'JIDR  
{ t[ZumQ@HC  
 CString str; !F|iL  
 BROWSEINFO bi; k5@_8Rc  
 char name[MAX_PATH]; hoQ?8}r:  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #`0iN+qh  
 bi.hwndOwner=GetSafeHwnd(); 7o4 vf~  
 bi.pszDisplayName=name; rGe^$!QB  
 bi.lpszTitle="Select folder"; ^{W#ut>IN  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :tA|g  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Um$a9S8b&  
 if(idl==NULL) (Q$]X5L  
  return; } bs2Rxkh  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); cCjpQ  
 str.ReleaseBuffer(); m9Uoq[1  
 m_Path=str; E+&]96*Lby  
 if(str.GetAt(str.GetLength()-1)!='\\') drQioH-  
  m_Path+="\\"; d[9NNm*htC  
 UpdateData(FALSE); ,A>i)brc  
} /e5Fx  
jnoFNIW   
void CCaptureDlg::SaveBmp() a'v%bL;H~  
{ [i'\d}  
 CDC dc; DvuL1Me Ko  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); zq5_&AeW  
 CBitmap bm; @Yq!  
 int Width=GetSystemMetrics(SM_CXSCREEN); B`4[@$  
 int Height=GetSystemMetrics(SM_CYSCREEN); %-4e8d74/  
 bm.CreateCompatibleBitmap(&dc,Width,Height); sKX%<n$  
 CDC tdc; S"=o U}'|  
 tdc.CreateCompatibleDC(&dc); e XU;UO^  
 CBitmap*pOld=tdc.SelectObject(&bm); DT=!  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); YJ5;a\QxN  
 tdc.SelectObject(pOld); ~%Ws"1  
 BITMAP btm; Kup-O u,  
 bm.GetBitmap(&btm); >Q~"/-bN)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; L?^C\g6u]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8<g_JW[%  
 BITMAPINFOHEADER bih; C%P"Ds=w0N  
 bih.biBitCount=btm.bmBitsPixel; hfvs' .  
 bih.biClrImportant=0; e;=G|E  
 bih.biClrUsed=0; aNW&ib  
 bih.biCompression=0; ;D/'7f7.}  
 bih.biHeight=btm.bmHeight; t3/!esay  
 bih.biPlanes=1; 9tS& $-  
 bih.biSize=sizeof(BITMAPINFOHEADER); ;e0>.7m  
 bih.biSizeImage=size; 'FBvAk6  
 bih.biWidth=btm.bmWidth; ^3`98y.Q  
 bih.biXPelsPerMeter=0; w9}I*Nra  
 bih.biYPelsPerMeter=0; ?.A6HrAPB  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )_EobE\  
 static int filecount=0; ftq~AF  
 CString name; 1ezQzc2-R  
 name.Format("pict%04d.bmp",filecount++); ji( S ?^  
 name=m_Path+name; D0QXvrf  
 BITMAPFILEHEADER bfh; .)Se-'  
 bfh.bfReserved1=bfh.bfReserved2=0; r _r$nl  
 bfh.bfType=((WORD)('M'<< 8)|'B'); nX Qz  
 bfh.bfSize=54+size; ej<z]{`05  
 bfh.bfOffBits=54; Smk]G))o{  
 CFile bf; :;" 3k64  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6x@-<{L  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 1&YP}sg)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); cf@#a@7m9  
  bf.WriteHuge(lpData,size); vS<;:3  
  bf.Close(); Dz)bP{iq"  
  nCount++; v *:m|wl  
 } TF^]^XS'  
 GlobalFreePtr(lpData); 3iWLo Qm  
 if(nCount==1) c_^H;~^rL  
  m_Number.Format("%d picture captured.",nCount); 5<w0*~Z d~  
 else 33Mr9Doon  
  m_Number.Format("%d pictures captured.",nCount); '~ ]b;nA  
  UpdateData(FALSE); ijhMJ?3  
} {/7'uD\ H  
v;K\#uc_  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !s)2H/KM8  
{ $ ]81s`  
 if(pMsg -> message == WM_KEYDOWN) & 8&WY1cU  
 { NHc+QMbou(  
  if(pMsg -> wParam == VK_ESCAPE) 6-X7C9`C  
   return TRUE; N&>D/Z;"  
  if(pMsg -> wParam == VK_RETURN) QW2% Gv:  
   return TRUE; \iVYhl  
 } <E\BKC%M  
 return CDialog::PreTranslateMessage(pMsg); sZ4H\  
} tOko %vY8  
<1jiU%!w  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2N,*S   
{ 0\Oeo8<7)~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ R1q04Zj{2  
  SaveBmp(); xD lC]loi7  
  return FALSE; :,VyOmf  
} K->p&6s  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ hcaH   
 CMenu pop; %)aDh }  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); xEiW]Eo  
 CMenu*pMenu=pop.GetSubMenu(0); xU rfH$$!`  
 pMenu->SetDefaultItem(ID_EXITICON); ac&tpvij  
 CPoint pt; 2=3iA09px  
 GetCursorPos(&pt); L:^'cl} G  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Vk_L*lcN  
 if(id==ID_EXITICON) (~#PzE :  
  DeleteIcon(); L,kF]  
 else if(id==ID_EXIT) sU}e78mh  
  OnCancel(); \R#XSW,  
 return FALSE; q5RLIstQ\  
} etDB|(,z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Sdt @"6  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ,vhR99g{  
 AddIcon(); gVl#pVO`N  
 return res; h'jnc.  
} yWK[@;S]%  
Lq&xlW j  
void CCaptureDlg::AddIcon() oD}I{&=wa  
{ L|H{;r'  
 NOTIFYICONDATA data;  z`_N|iEd  
 data.cbSize=sizeof(NOTIFYICONDATA); k<f*ns  
 CString tip; i/Hi  
 tip.LoadString(IDS_ICONTIP); (^Ln|3iz  
 data.hIcon=GetIcon(0); -zTeIvcy5  
 data.hWnd=GetSafeHwnd(); )t.q[O`  
 strcpy(data.szTip,tip); igQyn|  
 data.uCallbackMessage=IDM_SHELL; =Tj0dfO|"  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; n_+Iw,a'm  
 data.uID=98;  3sw1y  
 Shell_NotifyIcon(NIM_ADD,&data); ~|!lC}!IKL  
 ShowWindow(SW_HIDE); eX$Biv1N  
 bTray=TRUE; 0!zWXKX  
} 2Vi[qS^  
Z3/zUtgs  
void CCaptureDlg::DeleteIcon() O ,;SA  
{ M>^IQ  
 NOTIFYICONDATA data; ;}PL/L$L6;  
 data.cbSize=sizeof(NOTIFYICONDATA); N,1wfOE  
 data.hWnd=GetSafeHwnd(); TUUBC%  
 data.uID=98;  6$Dbeb  
 Shell_NotifyIcon(NIM_DELETE,&data); #QB`'2)vw  
 ShowWindow(SW_SHOW); Ar$LA"vu4  
 SetForegroundWindow(); P"#^i<ut@T  
 ShowWindow(SW_SHOWNORMAL); }l2JXf55  
 bTray=FALSE; ':[y]ep(~|  
} ](ninSX1w  
k{#:O=  
void CCaptureDlg::OnChange() D *tBbV  
{ 5u!cA4e"  
 RegisterHotkey(); doa$ ;=wg  
} Q7s1M&K  
{%$=^XO  
BOOL CCaptureDlg::RegisterHotkey() mU_O64  
{ 8L@di  Y  
 UpdateData(); $200?[  
 UCHAR mask=0; Ylf4q/-  
 UCHAR key=0; S&0x:VW  
 if(m_bControl) ~+g5?y  
  mask|=4; YUH/ tl  
 if(m_bAlt)  e?7paJ  
  mask|=2; prWid3}  
 if(m_bShift) 'SY &-<t(  
  mask|=1; 3_>R's8P  
  key=Key_Table[m_Key.GetCurSel()]; BCj&z{5"7e  
 if(bRegistered){  ?b0\[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,)RdXgCs  
  bRegistered=FALSE; B+<k,ad  
 } Q9'p2@Z  
 cMask=mask; AjS5  
 cKey=key; oMVwId f  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); j{PX ~/  
 return bRegistered; :8ZxOwwv  
} Q&J,"Vxw  
^/+sl-6/F  
  四、小结 g[$B9 0  
x<l1s  
  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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