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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: ?>T (  
  iT,Ya-9"  
  一、实现方法 R.)w l  
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  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: Y<)9TU:D!  
rZkl0Y;n\  
#pragma data_seg("shareddata") 5hg ^K^ZZ  
HHOOK hHook =NULL; //钩子句柄 ,cwjieM  
UINT nHookCount =0; //挂接的程序数目 BW5!@D2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 1 R,?kUa  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9`|~- b  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey o?((FW5.;  
static int KeyCount =0; <:!;79T\  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 B nu5\P  
#pragma data_seg() )^[PW&=W|x  
;Sw % t(@  
  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。 >>R,P Ow-  
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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: f6U i~  
a F5=k: k  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR N*6lyFcg  
cKey,UCHAR cMask) Y:KIaYkk  
{ ^w+)A;?W  
 BOOL bAdded=FALSE; V}po  
 for(int index=0;index<MAX_KEY;index++){ yd~}CF  
  if(hCallWnd[index]==0){ P{[@t_  
   hCallWnd[index]=hWnd; +H6cZ,  
   HotKey[index]=cKey; $I4:g.gKpG  
   HotKeyMask[index]=cMask; /~}<[6ZGCY  
   bAdded=TRUE; mj|TWDcj+  
   KeyCount++; <}n"gk1is  
   break; Mx_O'D  
  } 54>gr1B  
 } {-.ZFUZmT  
 return bAdded; &!0%"4  
} -;W`0 k^  
//删除热键 {/Qg4pc!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "Wn8}T*  
{ )I(2t 6i  
 BOOL bRemoved=FALSE; L3|~ i&k  
 for(int index=0;index<MAX_KEY;index++){ #:M <<gk  
  if(hCallWnd[index]==hWnd){ 9Pjw< xt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |N%#;7  
    hCallWnd[index]=NULL; 1qN+AT  
    HotKey[index]=0; `71(wf1q[f  
    HotKeyMask[index]=0; w+G+&ak<  
    bRemoved=TRUE; &+Yoob]P  
    KeyCount--; WLA LXJ7  
    break; u[+/WFH  
   } _6Qb 3tl  
  } ^7,`6g  
 } jQ&82X%m  
 return bRemoved; Msl8o c  
} tEjT$`6hp  
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p?e-`xs  
  DLL中的钩子函数如下: 7J[s5'~|  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =, G^GMi'  
{ L1u(\zw  
 BOOL bProcessed=FALSE; vq-# %o  
 if(HC_ACTION==nCode) CCp&+LRvR  
 { JH`oa1 b  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 < +X,oxg  
   switch(wParam) wgFAPZr  
   {  N5jJ,iz  
    case VK_MENU: tVqc!][   
     MaskBits&=~ALTBIT; ![3l K  
     break; %mr6p}E|  
    case VK_CONTROL: vD3j(d  
     MaskBits&=~CTRLBIT; SU>cJ*  
     break; _8ubo\M~  
    case VK_SHIFT: oa2v/P1`  
     MaskBits&=~SHIFTBIT; / &#b*46  
     break; C{2y*sx  
    default: //judge the key and send message hB??~>i3  
     break; C)R#Om  
   } P?$Iht.^  
   for(int index=0;index<MAX_KEY;index++){ EU4j'1!&g<  
    if(hCallWnd[index]==NULL) ;'P<#hM[$  
     continue; a`_w9r+v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d8% sGH  
    { qfa[KD)!aB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); o7 1f<&1  
     bProcessed=TRUE; M TOZ:b  
    } *wu|(t_ A  
   } ,Uu#41ZOKL  
  } 6):iu=/i/  
  else if((lParam&0xc000ffff)==1){ //有键按下 f\h|Z*Bv  
   switch(wParam) = @n`5g  
   { ew 4pAav  
    case VK_MENU: q :-1ul  
     MaskBits|=ALTBIT; cC7&]2X +f  
     break; w i=&W  
    case VK_CONTROL: I W5N^J  
     MaskBits|=CTRLBIT; d6+{^v$#  
     break; 5~\GAjf  
    case VK_SHIFT: [E6ZmMB&  
     MaskBits|=SHIFTBIT; A`ScAzx5{  
     break; #5=!ew  
    default: //judge the key and send message WN3]xw3  
     break; DxJY{e9  
   } ,@r 0-gL  
   for(int index=0;index<MAX_KEY;index++){ 'q, L*  
    if(hCallWnd[index]==NULL) NW`L6wgl  
     continue; SeIL   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^_!2-QY.~  
    { K} TSwY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); xF])NZy|  
     bProcessed=TRUE; }e0>Uk`[  
    } `z~L0h  
   } 8;Eg>_cL:  
  } `PI?RU[g*  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 f}uW(:f  
   for(int index=0;index<MAX_KEY;index++){ Lu9`(+  
    if(hCallWnd[index]==NULL) zIy&gOX  
     continue; Rs;Y|W4'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) I.hy"y2&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); B f"L;L  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 |P(8T'  
   } j5V{,lf  
  } WdJJt2'  
 } EJaGz\\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); s]Qo'q2  
} S/)yi  
= sh3&8  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ~xU\%@I\  
Be~In~~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [[' (,,r  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dz=pL$C  
meArS*d  
  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: ;Wedj\Kkp  
erdA ?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #v}pn2g%>  
{ +5qY*$dn  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) EVW\Z 2N.  
 { 2b^E8+r9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ~U<=SyZYo  
  SaveBmp(); "s.s(TR8  
  return FALSE; Bf8[(oc~  
 } 'A)9h7k}  
 …… //其它处理及默认处理 Pm== m9  
} zp:EssO=Q  
;kR+jC(  
pz,iQUs _o  
  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。 y?ypRCgO.u  
HA]5:ck  
  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。 T/iZ"\(~w  
uow{a*q d6  
  二、编程步骤 |ohCA&k%;  
jWcfQ  
  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"; Z^6qxZJ7  
KU 98"b5  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; (65|QA   
JlhI3`X;/  
  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; 3%YDsd vQx  
6h{>U*N"&d  
  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; gX;)A|9e  
xyyEaB  
  5、 添加代码,编译运行程序。 UKzXz0  
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三、程序代码 't'2z  
+r$M 9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL h_\OtoRa  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) mV#U=zqb!S  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]7J*(,sp  
#if _MSC_VER > 1000 /A1qTG=Br  
#pragma once |)+45e  
#endif // _MSC_VER > 1000 Fr)6<9%xVm  
#ifndef __AFXWIN_H__ ^|ul3_'?  
#error include 'stdafx.h' before including this file for PCH !<= ^&\A  
#endif @ GXi{9  
#include "resource.h" // main symbols V*H7m'za  
class CHookApp : public CWinApp UYvdzCUh  
{ M=#g_*d  
 public: SshjUNx  
  CHookApp(); .RN2os{  
  // Overrides L&G5 kY`  
  // ClassWizard generated virtual function overrides WuMr";2*E  
  //{{AFX_VIRTUAL(CHookApp) `P?!2\/  
 public: R/Te ;z  
  virtual BOOL InitInstance(); *s$:"g-  
  virtual int ExitInstance(); ?9Sc KN  
  //}}AFX_VIRTUAL oL -udH  
  //{{AFX_MSG(CHookApp) tLzKM+Ct#  
  // NOTE - the ClassWizard will add and remove member functions here. A0 $ds  
  // DO NOT EDIT what you see in these blocks of generated code ! xew s~74L  
  //}}AFX_MSG i9v|*ZM"  
  DECLARE_MESSAGE_MAP() npMPjknl  
}; U~O*9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); A O3MlK9t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $aDkZj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {)PgN  
BOOL InitHotkey(); "HtaJVp//  
BOOL UnInit(); DT3koci(  
#endif =&#t ("  
5q _n 69b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. r Fhi:uRV  
#include "stdafx.h" ,d7o/8u  
#include "hook.h" #r'S@:[  
#include <windowsx.h> 2k+u_tj>  
#ifdef _DEBUG )uC5  
#define new DEBUG_NEW A@)ou0[n@  
#undef THIS_FILE [ ]42$5eof  
static char THIS_FILE[] = __FILE__; W4$F\y  
#endif %6E:SI 4  
#define MAX_KEY 100 gp NAM"  
#define CTRLBIT 0x04 5v"Sv  
#define ALTBIT 0x02 Esdw^MGL2  
#define SHIFTBIT 0x01 %nhE588xf  
#pragma data_seg("shareddata") %:yVjb,Yf  
HHOOK hHook =NULL; Vu;z|L  
UINT nHookCount =0; gfQ1p?  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Vw+RRi(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT +k\cmDcb  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }TRVCF1  
static int KeyCount =0; +l;AL5h  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift b] ~  
#pragma data_seg() jPEOp#C  
HINSTANCE hins; S^_F0</U,  
void VerifyWindow(); @waY+sqt=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =O>E>Q  
//{{AFX_MSG_MAP(CHookApp) :Hj #1-U  
// NOTE - the ClassWizard will add and remove mapping macros here. ')>D*e  
// DO NOT EDIT what you see in these blocks of generated code! _zDf8hy  
//}}AFX_MSG_MAP Xk}\-&C7  
END_MESSAGE_MAP() Y@limkN:  
lK3{~ \J-  
CHookApp::CHookApp() @6%o0p9zz  
{ M?QX'fia  
 // TODO: add construction code here, c|Fu6LF a  
 // Place all significant initialization in InitInstance ? u~?:a@K  
} @P/6NMjZ^  
FY"csZ  
CHookApp theApp; TV~S#yg+H  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 91M5F$  
{ ]}L tf,9  
 BOOL bProcessed=FALSE; s3y"y_u  
 if(HC_ACTION==nCode) S@cKo&^  
 { (lt{$0   
  if((lParam&0xc0000000)==0xc0000000){// Key up ?wREX[Tqs  
   switch(wParam) o ^""=Z  
   { 30{WGc@l#  
    case VK_MENU: ~2[mZias  
     MaskBits&=~ALTBIT; OPC8fX5.  
     break; xM**n3SZ`  
    case VK_CONTROL: Bb.U4#  
     MaskBits&=~CTRLBIT; liPaT  
     break; AtNF&=Op  
    case VK_SHIFT: <ToRPx&E  
     MaskBits&=~SHIFTBIT; ;&$f~P Q  
     break; b{}ao  
    default: //judge the key and send message uA~?z :~=  
     break; B:#9   
   } IC+!XZqS  
   for(int index=0;index<MAX_KEY;index++){ gm =LM=  
    if(hCallWnd[index]==NULL) J*t_r-z  
     continue; mZ~f?{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sE!$3|Q  
    { 1!Afq}|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); qe|U*K 2_  
     bProcessed=TRUE; @0-vf>e3-  
    } mq+<2 S  
   } ]MnQ3bWq"j  
  } nIGElt]  
  else if((lParam&0xc000ffff)==1){ //Key down G{gc]7\=Cd  
   switch(wParam) _FkIg>s  
   { h6Cqc}P  
    case VK_MENU: .zsY VtK  
     MaskBits|=ALTBIT; sPvjJr"s  
     break; /]-a 1  
    case VK_CONTROL: \WxBtpbQ B  
     MaskBits|=CTRLBIT; |>KOlwh5n  
     break; I-m Bj8^;  
    case VK_SHIFT: _2w8S\  
     MaskBits|=SHIFTBIT; '3fN2[(  
     break; ~nb1c:F  
    default: //judge the key and send message ;lf$)3%[  
     break; lPw`KW  
   } Z6 E_Y?  
   for(int index=0;index<MAX_KEY;index++) kY{;(b3Q  
   { KO[,C[;|j  
    if(hCallWnd[index]==NULL) \ `R8s_S  
     continue; Fb6d1I^wR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rDv`E^\  
    { =b#:j:r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8/R9YiY5*  
     bProcessed=TRUE; {'yr)(:2M  
    } H7}f[4S%  
   } ^9 ^DA!'  
  } ! =*k+gpF  
  if(!bProcessed){ :M8y 2f h  
   for(int index=0;index<MAX_KEY;index++){ 009Q#[A  
    if(hCallWnd[index]==NULL) 3EH7H W  
     continue; 2yV^'o)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) P4fnBH4OQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "6gBbm  
   } p\DSFB  
  } D+y?KihE  
 } J@+b_e*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); f([d/  
} vF)eo"_s*  
Qcn;:6_&W  
BOOL InitHotkey() ,,]<f*N  
{ wK0],,RN,h  
 if(hHook!=NULL){ ~>XqR/v  
  nHookCount++; |q c<C&O  
  return TRUE; d&naJ)IoF)  
 } R#ZO<g%'  
 else gv,1 CK  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); u>/Jb+  
  if(hHook!=NULL) +0) H~ qB\  
   nHookCount++; yz=aJ v; H  
  return (hHook!=NULL); /Ow@CB  
} myF/_o&Ty  
BOOL UnInit() } ^2'@y!(  
{ onl,R{,`0  
 if(nHookCount>1){ a#a n+JY3  
  nHookCount--; 5,?^SK|'x  
  return TRUE; B`:l;<&jX  
 } f o idneus  
 BOOL unhooked = UnhookWindowsHookEx(hHook); XrI$@e*  
 if(unhooked==TRUE){ ~~q>]4>  
  nHookCount=0; 38GZ_ z}r  
  hHook=NULL; WZ=$c]gG  
 } ._q<~_~R  
 return unhooked; 0cq<!{d  
} 9-!GYa'Z  
ZE9.r`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yB|1?L#  
{ -t: U4r(  
 BOOL bAdded=FALSE; "[0.a\ d<  
 for(int index=0;index<MAX_KEY;index++){ =yWdtBng  
  if(hCallWnd[index]==0){ +G)a+r'0Q  
   hCallWnd[index]=hWnd;  Z>pZ|  
   HotKey[index]=cKey; Q 3/J @MC  
   HotKeyMask[index]=cMask; Y|buQQ|  
   bAdded=TRUE; A=wG};%_  
   KeyCount++; )r?- _qj=  
   break; sgRWjrc/  
  } D 4sp+   
 } <6+T&Ov6  
 return bAdded; 7"1]5\p^g  
} $g),|[ x+(  
`pF7B6[B  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &Bqu2^^  
{  HlEHk'  
 BOOL bRemoved=FALSE; dSe d 6  
 for(int index=0;index<MAX_KEY;index++){ l#Vg=zrT  
  if(hCallWnd[index]==hWnd){ GP;N1/=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ FH%M5RD  
    hCallWnd[index]=NULL; z\$(@:{A  
    HotKey[index]=0; )y{:Uc\4!  
    HotKeyMask[index]=0; tG~[E,/`  
    bRemoved=TRUE; #Hy\l J  
    KeyCount--; MaPI<kYQv  
    break; Hp@Q  
   } u<4bOJn({  
  } T3I{D@+0  
 } BN~ndWRK  
 return bRemoved; Hbn78,~ .  
} =.w~qL  
e^;%w#tEqI  
void VerifyWindow() 1 J}ML}h)  
{ i!gS]?*DH  
 for(int i=0;i<MAX_KEY;i++){ 5vJxhBm/  
  if(hCallWnd!=NULL){ HiBI0)N}  
   if(!IsWindow(hCallWnd)){ i.\ e/9]f  
    hCallWnd=NULL; iB`EJftI!  
    HotKey=0; Mmg~Fn  
    HotKeyMask=0; G#M0 C>n  
    KeyCount--; ]LEaoOecu  
   } JKy~'>Q  
  } cICf V,j  
 } 2[qoqd(  
} `F3wO!  
E^$8nqCL:  
BOOL CHookApp::InitInstance() =- ,'LOE  
{ =T\=,B  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); }kP<zvAaw  
 hins=AfxGetInstanceHandle(); (][-()YV  
 InitHotkey(); x=+>J$~Pb  
 return CWinApp::InitInstance(); +(y 8q  
} tG ZMIG_  
v\_\bT1  
int CHookApp::ExitInstance() Sp*4Z`^je  
{ e\O-5hp7  
 VerifyWindow(); *+nw%gZG  
 UnInit(); g> ~+M  
 return CWinApp::ExitInstance(); )@P*F) g~  
} C|h Uyo  
w*&vH/D  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Y B,c=Wx  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) kW1w;}n$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @_7rd  
#if _MSC_VER > 1000 Hp>L}5 y[  
#pragma once WA0D#yuJ/  
#endif // _MSC_VER > 1000 pWq+`|l$  
o\]U;#YD  
class CCaptureDlg : public CDialog ]^T-X/v9  
{ `oH4"9&]k3  
 // Construction EB*C;ms  
 public: &AWrM{e  
  BOOL bTray; *")*w> R  
  BOOL bRegistered; A=IpP}7J  
  BOOL RegisterHotkey(); esj6=Gh  
  UCHAR cKey; >oO]S]W  
  UCHAR cMask; Z4rk$K'=1w  
  void DeleteIcon(); r7L.W  
  void AddIcon(); +I3O/=)  
  UINT nCount; {+nf&5E 6  
  void SaveBmp(); szb@2fK  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .g1x$cQ1<  
  // Dialog Data w%8y5v5  
  //{{AFX_DATA(CCaptureDlg) qDYNY`  
  enum { IDD = IDD_CAPTURE_DIALOG }; 1U/RMN3`  
  CComboBox m_Key; :~#)Xa0I  
  BOOL m_bControl; W]bgWKd  
  BOOL m_bAlt; x)GheM^  
  BOOL m_bShift; zBu@a:E%H  
  CString m_Path; &0tW{-Hv"  
  CString m_Number; nj1o!+9>$  
  //}}AFX_DATA YB<nz<;JR  
  // ClassWizard generated virtual function overrides m C`*#[  
  //{{AFX_VIRTUAL(CCaptureDlg) Y;%LwDC  
 public: 8>Cf}TvErx  
  virtual BOOL PreTranslateMessage(MSG* pMsg); \$*CXjh3G  
 protected: t$wbwP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r-TrA$k  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =&,T@5&-=  
  //}}AFX_VIRTUAL 4d cm)Xr  
  // Implementation E}v8Q~A(  
 protected: } Z FoCMM  
  HICON m_hIcon; |w54!f6w_  
  // Generated message map functions B+mxM/U[c  
  //{{AFX_MSG(CCaptureDlg) cz{`'VN}`  
  virtual BOOL OnInitDialog(); {\CWoFht>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0c`nk\vUy  
  afx_msg void OnPaint(); c)B3g.C4m  
  afx_msg HCURSOR OnQueryDragIcon(); 6h2keyod  
  virtual void OnCancel(); V7r_Ubg@K  
  afx_msg void OnAbout(); Dmr*Lh~  
  afx_msg void OnBrowse(); y_}vVHT,  
  afx_msg void OnChange(); 1[8^JVC>6  
 //}}AFX_MSG i?;#Z Nh  
 DECLARE_MESSAGE_MAP() iC/*d  
}; 6lv@4R^u  
#endif u}|v;:|j  
#v<`|_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "YY<T&n  
#include "stdafx.h"  Pd\4hy  
#include "Capture.h" Fa[^D~$l*  
#include "CaptureDlg.h" )Uy%iE*  
#include <windowsx.h> !Q15qvRS  
#pragma comment(lib,"hook.lib") t!*[nfR  
#ifdef _DEBUG 1n[)({OQ  
#define new DEBUG_NEW 8.n#@%  
#undef THIS_FILE T3@2e0u )  
static char THIS_FILE[] = __FILE__; >Zs!  
#endif HbI{Xf[6LP  
#define IDM_SHELL WM_USER+1 ,;Wm>V)o  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `bfUP s  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wjwCs`  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ] xHiy+  
class CAboutDlg : public CDialog H-+U^@w  
{ fmj}NV&ma  
 public: n qO*z<  
  CAboutDlg(); Zk((VZ(y  
  // Dialog Data GEF's#YWK  
  //{{AFX_DATA(CAboutDlg) j?m(l,YD|*  
  enum { IDD = IDD_ABOUTBOX }; /MY's&D(  
  //}}AFX_DATA vj%"x/TP  
  // ClassWizard generated virtual function overrides #e-K It  
  //{{AFX_VIRTUAL(CAboutDlg) QK[^G6TI  
 protected: i.uyfV&F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support q i yK  
  //}}AFX_VIRTUAL O>qlWPht  
  // Implementation 41<h|WA  
 protected: z$R&u=J  
  //{{AFX_MSG(CAboutDlg) ;mQ|+|F6X  
  //}}AFX_MSG * 3fl}l  
  DECLARE_MESSAGE_MAP() B qX"La,  
}; -0kMh.JYR  
$<nRW*d  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %W\NYSm  
{ hmo4H3g!N  
 //{{AFX_DATA_INIT(CAboutDlg) L%/>Le}VX  
 //}}AFX_DATA_INIT W+1nf:AI.  
} PL{lYexJ  
py:L-5  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) cM'MgX9  
{ 3 0[Xkz  
 CDialog::DoDataExchange(pDX); oSD=3DQ;  
 //{{AFX_DATA_MAP(CAboutDlg) iL);bv W  
 //}}AFX_DATA_MAP 9dNkKMc@  
} m;l[flQ~  
@9| jY1  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +;lDU}$  
 //{{AFX_MSG_MAP(CAboutDlg) 5?SE?VC=t  
 // No message handlers iKE&yO3  
 //}}AFX_MSG_MAP Awxm[:r>^  
END_MESSAGE_MAP() -Yse^(^"s  
mc%. 8i  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) nUpj+F#  
: CDialog(CCaptureDlg::IDD, pParent) s 0Uid&qE  
{ e}yF2|0FD  
 //{{AFX_DATA_INIT(CCaptureDlg) (0q`eO2  
  m_bControl = FALSE; z2YYxJ c&w  
  m_bAlt = FALSE; !~9ASpqvPy  
  m_bShift = FALSE; Hq 5#.rZ#  
  m_Path = _T("c:\\"); \O"H#gt  
  m_Number = _T("0 picture captured."); y,`n9[$K\  
  nCount=0; = K}Pfh  
  bRegistered=FALSE; PL&> p M  
  bTray=FALSE; pLCj"D).M  
 //}}AFX_DATA_INIT gi,7X\`KQ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *sU,waX  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); M?sax+'  
} %C,zR&]F  
J{dO0!7y  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Yc]k<tQ  
{ 4)tY6ds)r|  
 CDialog::DoDataExchange(pDX); Jw}t~m3  
 //{{AFX_DATA_MAP(CCaptureDlg) [;,E cw^  
  DDX_Control(pDX, IDC_KEY, m_Key); fVgK6?<8^  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); }Y.YJXum  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Db|JR  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); WUie `p  
  DDX_Text(pDX, IDC_PATH, m_Path); DCiU?u~  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Zqm%qm:  
 //}}AFX_DATA_MAP X5/j8=G H`  
} y4jiOhF<d  
0vfMJzk  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) j[gqS%  
//{{AFX_MSG_MAP(CCaptureDlg) 9`/e= RL  
 ON_WM_SYSCOMMAND() gPB=Z!  
 ON_WM_PAINT() ,= ApnNUgX  
 ON_WM_QUERYDRAGICON() *Ci&1Mu^Z  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) q;nAq%  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 13/,^?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ffL]_E  
//}}AFX_MSG_MAP plB8iN`x<  
END_MESSAGE_MAP() 59D '*!l-  
!Z2h ?..O  
BOOL CCaptureDlg::OnInitDialog() rBmW%Gv  
{ J&~I4ko]  
 CDialog::OnInitDialog(); 4'#=_J  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); a. D cmy{  
 ASSERT(IDM_ABOUTBOX < 0xF000); e_epuki  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @JhkUGG]p  
 if (pSysMenu != NULL) _VdJFjY?zc  
 { u-iQ  
  CString strAboutMenu; bS8$[7OhX  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 0qFO+nC  
  if (!strAboutMenu.IsEmpty()) &77J,\C$:  
  { A}9^,C$#  
   pSysMenu->AppendMenu(MF_SEPARATOR); B"> Ko3  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); n]#YL4j  
  } !O!:=wq  
 } paV1o>_Rd  
 SetIcon(m_hIcon, TRUE); // Set big icon b*h:e.q  
 SetIcon(m_hIcon, FALSE); // Set small icon o'$-  
 m_Key.SetCurSel(0); .jP|b~  
 RegisterHotkey(); P??P"^hU  
 CMenu* pMenu=GetSystemMenu(FALSE); - i2^ eZl  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .$cX:"_Mk  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); n%36a(] t  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <(Ar[Rp  
 return TRUE; // return TRUE unless you set the focus to a control 2 oL$I(83  
} C<a&]dN/  
&?QKWxN  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) IxWi>8  
{ Gq1C"s$4'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) <ndY6n3  
 { J)Yz@0#T(;  
  CAboutDlg dlgAbout; uaP5(hUI  
  dlgAbout.DoModal(); nX7F<k4G2  
 } -2}ons(  
 else X{cB%to  
 { 09vVCM;DY  
  CDialog::OnSysCommand(nID, lParam); ckFPx l.  
 } >?JUGXAi'{  
} KS5a8'U  
ehr\lcS<  
void CCaptureDlg::OnPaint() 8hww({S2  
{ 30I-E ._F  
 if (IsIconic()) u8?$W%eW  
 { g; -3  
  CPaintDC dc(this); // device context for painting Jb> X$|N'%  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Xbx=h^S  
  // Center icon in client rectangle mvpcRe <  
  int cxIcon = GetSystemMetrics(SM_CXICON); Fg p|gw4  
  int cyIcon = GetSystemMetrics(SM_CYICON); t3.;qDy  
  CRect rect; \25EI]  
  GetClientRect(&rect); :&&s*_  
  int x = (rect.Width() - cxIcon + 1) / 2; 5,4" CF$  
  int y = (rect.Height() - cyIcon + 1) / 2; J( ]b1e  
  // Draw the icon 7R5ebMW V  
  dc.DrawIcon(x, y, m_hIcon); *\:sHVyG(  
 } a6h+?Q7uF  
 else `j'1V1  
 { |AExaO"jk  
  CDialog::OnPaint(); T-4dD  
 } 3jfAv@I~  
} wU'+4N".  
J=kf KQV  
HCURSOR CCaptureDlg::OnQueryDragIcon() fA1{-JzV<4  
{ mDA+ .l&)b  
 return (HCURSOR) m_hIcon; ?vWF[ DRd'  
} P(b~3NB)  
$rQ7"w J  
void CCaptureDlg::OnCancel() } @3q;u)  
{ \goiW;b  
 if(bTray) Zonn  
  DeleteIcon(); PL31(!`@d  
  CDialog::OnCancel(); N8x&<H  
} H^o_B1  
@>ys,dy  
void CCaptureDlg::OnAbout() k&[6Ld0~56  
{ W"\`UzOLQ  
 CAboutDlg dlg; iSOyp\E|  
 dlg.DoModal(); Xep2 )3k>  
} _'y`hKeI[  
^"iL|3d  
void CCaptureDlg::OnBrowse() A[fTpS~~%  
{ hDg"?{  
 CString str; `DGI|3  
 BROWSEINFO bi; (ruMOKW  
 char name[MAX_PATH]; o+k*ia~Fa  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); =_N $0  
 bi.hwndOwner=GetSafeHwnd(); !w/fw Oo  
 bi.pszDisplayName=name; VS`{k^^  
 bi.lpszTitle="Select folder"; OqH3. @eK  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Hv' OO@z  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); +S#Xm4  
 if(idl==NULL) XCxxm3t  
  return; D8*6h)~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }=|{"C  
 str.ReleaseBuffer(); 'O2/PU2_  
 m_Path=str; f#I#24)RH  
 if(str.GetAt(str.GetLength()-1)!='\\') T#Bj5H  
  m_Path+="\\"; G"L`9E<0V  
 UpdateData(FALSE); 3,hu3"@k  
} ]M"U 'Z  
^HuB40  
void CCaptureDlg::SaveBmp() 4kV$JV.l  
{  (t@!0_5  
 CDC dc;  N?,  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); BVus3Y5IJQ  
 CBitmap bm; BSr#;;\  
 int Width=GetSystemMetrics(SM_CXSCREEN); c1R[Hck  
 int Height=GetSystemMetrics(SM_CYSCREEN); H<nA*Zf2@R  
 bm.CreateCompatibleBitmap(&dc,Width,Height); vq3:N'  
 CDC tdc; 5L7 nEia'  
 tdc.CreateCompatibleDC(&dc); 5K&A2zC|  
 CBitmap*pOld=tdc.SelectObject(&bm); }2c&ARQ.m>  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); mL#$8wUdt{  
 tdc.SelectObject(pOld);  )L":I  
 BITMAP btm; &Wdi 5T8  
 bm.GetBitmap(&btm); !"E/6z2&(k  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 9G7Brs:  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Bz%wV-  
 BITMAPINFOHEADER bih; m9 c`"!  
 bih.biBitCount=btm.bmBitsPixel; $Dv5TUKw  
 bih.biClrImportant=0; OYmutq  
 bih.biClrUsed=0; V4n;N  
 bih.biCompression=0; ~(Q#G" t  
 bih.biHeight=btm.bmHeight; d mTZEO  
 bih.biPlanes=1; <wd;W;B  
 bih.biSize=sizeof(BITMAPINFOHEADER); G~_D'o<r  
 bih.biSizeImage=size; ,5T1QWn^f  
 bih.biWidth=btm.bmWidth; Y}C|4"V  
 bih.biXPelsPerMeter=0; @S5HMJ2=  
 bih.biYPelsPerMeter=0; *].qm g%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); j]-_kjt  
 static int filecount=0; P_p\OK*l]o  
 CString name; R S>qP;V*-  
 name.Format("pict%04d.bmp",filecount++); 4OAR ["f  
 name=m_Path+name; UbIUc}ge  
 BITMAPFILEHEADER bfh; =jxy4`oF  
 bfh.bfReserved1=bfh.bfReserved2=0; +RiI5.$=Z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $i!r> .Jo  
 bfh.bfSize=54+size; S$40nM  
 bfh.bfOffBits=54; X -=M>H^  
 CFile bf; u35"oLV6}#  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ DV>;sCMJ %  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); LU@1Gol  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); f+)LVT8p  
  bf.WriteHuge(lpData,size); Q$k#q<+0  
  bf.Close(); B o%Sl  
  nCount++; SY@;u<Pd   
 } jlqSw4_  
 GlobalFreePtr(lpData); E1w8d4P,G  
 if(nCount==1) c7[Ba\Cr4h  
  m_Number.Format("%d picture captured.",nCount); zR/mz)6_  
 else xBf->o S?  
  m_Number.Format("%d pictures captured.",nCount); g2M1zRm;  
  UpdateData(FALSE); zqQ[uO]m?  
} )>"Ky  
s bR*[2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @W==)S%O  
{ :>H{?  
 if(pMsg -> message == WM_KEYDOWN) ug"4P.wI  
 { )7#3n(_np  
  if(pMsg -> wParam == VK_ESCAPE) N K@6U_/W  
   return TRUE; 5'`DrTOA  
  if(pMsg -> wParam == VK_RETURN) Nm-E4N#'i  
   return TRUE; 0;OZ|;Z  
 } ~Dw% d;  
 return CDialog::PreTranslateMessage(pMsg); n\BV*AH  
} 0pH$Mk Q  
@~5Fcfmm  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _^ n>kLd$  
{ *xj2Z,u  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ^Q+z^zlC  
  SaveBmp(); |942#rM  
  return FALSE; Z0XQ|gkH  
} <y7Hy&&y-  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -H|!KnR  
 CMenu pop; YV>&v.x0;  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); W+4Bx=Mj  
 CMenu*pMenu=pop.GetSubMenu(0); (Gapv9R  
 pMenu->SetDefaultItem(ID_EXITICON); VpY,@qh  
 CPoint pt; 8b4? O"  
 GetCursorPos(&pt); $ )2zz>4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); w`M`F<_\:  
 if(id==ID_EXITICON) RjrQDh|((  
  DeleteIcon(); bwszfPM  
 else if(id==ID_EXIT) W?ghG  
  OnCancel(); O9ro{ k  
 return FALSE; Pj BBXI1i  
} m0^~VK|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); C58B(Ndo  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) u{D]Kc?n  
 AddIcon(); qa8?bNd'f  
 return res; fgF@ x  
} ?zVE7;r4U  
v5?ct?q  
void CCaptureDlg::AddIcon() P"@^BQ4  
{ TXs&*\  
 NOTIFYICONDATA data; WqCj;Tj|  
 data.cbSize=sizeof(NOTIFYICONDATA); N_+D#Z.g  
 CString tip; CEzdH!nP  
 tip.LoadString(IDS_ICONTIP); G_ ~qk/7mF  
 data.hIcon=GetIcon(0); NH=@[t) P,  
 data.hWnd=GetSafeHwnd(); 4V mUTMY  
 strcpy(data.szTip,tip); *7L1SjZw  
 data.uCallbackMessage=IDM_SHELL; G"Ey%Q2K  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; CalW J  
 data.uID=98; WV p6/HS  
 Shell_NotifyIcon(NIM_ADD,&data); ]zIIi%  
 ShowWindow(SW_HIDE); \SYeDy  
 bTray=TRUE; &#.>-D{  
} 2Ib 1D  
sP=^5K`g  
void CCaptureDlg::DeleteIcon() ]j$(so"  
{ H_1&>@ 3  
 NOTIFYICONDATA data; &Rz-;66bN  
 data.cbSize=sizeof(NOTIFYICONDATA); K&"X7fQ  
 data.hWnd=GetSafeHwnd(); OW!y7  
 data.uID=98; Df(+@L5!  
 Shell_NotifyIcon(NIM_DELETE,&data); SFFJyRCz  
 ShowWindow(SW_SHOW); + kF%>F]  
 SetForegroundWindow(); X V)ctF4  
 ShowWindow(SW_SHOWNORMAL); K,*z8@  
 bTray=FALSE; CqU^bVs  
} GI:!,9  
!>kg:xV  
void CCaptureDlg::OnChange() %`/F> `  
{ z XUr34jF  
 RegisterHotkey(); #60gjHYaV  
} L[`8 :}M  
cBZJ  
BOOL CCaptureDlg::RegisterHotkey() 3+iryW(\  
{ K(TejW#  
 UpdateData(); Q0ba;KPm  
 UCHAR mask=0; X_,R!$wbg:  
 UCHAR key=0; (FGH t/!  
 if(m_bControl) V <ilv<  
  mask|=4; S5UQ   
 if(m_bAlt) iYlkc  
  mask|=2; :<5jlpV(  
 if(m_bShift) 0&tr3!h\  
  mask|=1; (>lH=&%zj  
  key=Key_Table[m_Key.GetCurSel()]; OcC|7s" ,  
 if(bRegistered){ u6MU @?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); (rBYE[@,  
  bRegistered=FALSE; E9 @Sc>e  
 } f9d{{u  
 cMask=mask; zzd PR}VG  
 cKey=key; gp'k(rGH  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )6o%6$c  
 return bRegistered; wuSotbc/  
} sl P>;  
-q? ,  
  四、小结 T~g`;Q%i  
O+[s4]  
  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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