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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: [w}-)&c  
  qz- tXc ,  
  一、实现方法 M XW1 :  
j~_iv~[  
  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: Sk EI51]  
Op0*tj2i),  
#pragma data_seg("shareddata") Um/l{:S   
HHOOK hHook =NULL; //钩子句柄 xy`Y7W=  
UINT nHookCount =0; //挂接的程序数目 aUL7 ]'q}  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7s^b@&Le  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 l]wfL;u  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey KS#A*BRQ  
static int KeyCount =0; p+g=Z<?`  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 }S iR;2W  
#pragma data_seg() glC,E>  
cQ1[x>OcU  
  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。 .]E"w9~  
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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: e oE)Mq  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ?"'+tZ=f6  
cKey,UCHAR cMask) &wDZ@{h  
{ <e! TF @  
 BOOL bAdded=FALSE; KxErWP%  
 for(int index=0;index<MAX_KEY;index++){ >}wFePl  
  if(hCallWnd[index]==0){ _'!qOt7D  
   hCallWnd[index]=hWnd; .+(ED  
   HotKey[index]=cKey; h,y_ ^cf  
   HotKeyMask[index]=cMask; OM.-apzC  
   bAdded=TRUE; b B#QIXY/L  
   KeyCount++; G#Bm">+  
   break; :Y Ls]JI<  
  } , $!F,c  
 } M2V`|19Q  
 return bAdded; gIO_mJ3 u  
} xw{K,; WeO  
//删除热键 4Kt0}W  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =zH)R0!eG  
{ F u5zj\0J  
 BOOL bRemoved=FALSE; cQ$[Ba  
 for(int index=0;index<MAX_KEY;index++){ ~;6^n  
  if(hCallWnd[index]==hWnd){ *_YH}U  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ AxEdQRGk  
    hCallWnd[index]=NULL; oM1C/=8   
    HotKey[index]=0; F&`%L#s|  
    HotKeyMask[index]=0; LV ]10v6  
    bRemoved=TRUE; BZv:E?1z  
    KeyCount--; u~,hT Y(%  
    break; 0B[~j7EGO  
   } V.8Vy1$  
  } gs+n J+b  
 } H|e7IsY%  
 return bRemoved; {|$kI`h,3-  
} cRs\()W  
$$Tf1hIg  
DI(XB6  
  DLL中的钩子函数如下: .|CoueH  
 N MkOx$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) VN09g&  
{ Qn$YI9t  
 BOOL bProcessed=FALSE; W $mw9  
 if(HC_ACTION==nCode) d l Ab`ne  
 { l ?b*T#uIk  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 '_Q';T_n99  
   switch(wParam) )Ko~6.:5H  
   {  z(,j)".  
    case VK_MENU: +P+h$gQ  
     MaskBits&=~ALTBIT; >KQ/ c  
     break; <iH   
    case VK_CONTROL: 4lCbUk[l  
     MaskBits&=~CTRLBIT; ` >>]$ZJ  
     break; PDH|=meXM  
    case VK_SHIFT: 4h?@D_{k  
     MaskBits&=~SHIFTBIT; daCkjDGl\  
     break; [T9]q8"  
    default: //judge the key and send message C[{E8Tg/  
     break; 6J- /%  
   } V:t{mu5j  
   for(int index=0;index<MAX_KEY;index++){ 8LF=l1=~  
    if(hCallWnd[index]==NULL) %x;~ o:  
     continue; fg ,vTpBk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'Sgz\ =K  
    { CXuMNa  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9]T61Z{OW1  
     bProcessed=TRUE; :3s^, g  
    } zXUB6. e  
   } g`Q!5WK*  
  } 89KFZ[.}]  
  else if((lParam&0xc000ffff)==1){ //有键按下 3A0Qjj=  
   switch(wParam) =oq=``%  
   { 00SS<iX  
    case VK_MENU: @K S.H  
     MaskBits|=ALTBIT; [j TU nP  
     break; ?.-+U~  
    case VK_CONTROL: KbciRRf!k  
     MaskBits|=CTRLBIT; ,c`Wmp^AY  
     break; Gh6U<;V?*  
    case VK_SHIFT: ?Vh#Gr  
     MaskBits|=SHIFTBIT; }Q9+krrow  
     break; 7wY0JS$fz  
    default: //judge the key and send message rmC7!^/  
     break; }4piZ ch  
   } DTsD<o  
   for(int index=0;index<MAX_KEY;index++){ ?b}e0C-a  
    if(hCallWnd[index]==NULL) Z6-  
     continue; 9:3`LY3wW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ew,okRCN  
    { UHk)!P>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); NBBR>3nt  
     bProcessed=TRUE; ;jQ^8 S  
    } Ps(oxj7  
   } fGA#0/_`  
  } y"8,jm  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Xwu&K8q21  
   for(int index=0;index<MAX_KEY;index++){ j%ZBAk)}  
    if(hCallWnd[index]==NULL) eNH9`Aa  
     continue; #}Xsi&:XU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Y~*aA&D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); x&JD~,Y  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ~PAI0+*"q  
   } a-nn[ j  
  } Gf+X<a  
 } 9GT}_ ^fb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Gr}NgyT<!D  
} B+jh|@-  
8$RiFD ,  
  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: 0"GLgj:9  
$Fi1Bv)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b?!S$Sxz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;;C2t&(  
uvR l`"Y  
  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: *c%{b3T_  
>[nR$8_J-l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g-ZXj4Ph!  
{ lu+KfKa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) j B1ZF#  
 { Yi[MoYe/K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6f t6;*,  
  SaveBmp(); RFSwX*!  
  return FALSE; j, *= D6  
 } @.)[U:N  
 …… //其它处理及默认处理 xzFQ)t&  
} [wJ\.9<Oa  
/ $s(OFbi#  
M^ e}w!U  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 o9C# 5%9  
OTAe#]#  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 O:~J_Wwl!  
MXDCOe~07  
  二、编程步骤  !I&,!$  
P1^|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"; 3xdJ<Lrq  
Q W c^}#!!  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; $-jj%kS  
DvLwX1(l  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; IAN={";p  
([^f1;ncm  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; [}l 90lP  
FJKlqM5]  
  5、 添加代码,编译运行程序。 Jf#-OlEQ  
0V86]zSo  
三、程序代码 _I3v"d  
rz`"$g+#  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Lm<WT*@  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) o=Mm=;H  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ D dCcsYm,  
#if _MSC_VER > 1000 *XYp~b  
#pragma once Z( "-7_  
#endif // _MSC_VER > 1000 w8:  
#ifndef __AFXWIN_H__ 5'V-Ly)*%  
#error include 'stdafx.h' before including this file for PCH 8GjETq%}  
#endif ^K4?uABc  
#include "resource.h" // main symbols >vYb'%02  
class CHookApp : public CWinApp C(8!("tU  
{ 1;B&R89}  
 public: m],.w M8  
  CHookApp(); Bu?Qyz2O  
  // Overrides E'6/@xM  
  // ClassWizard generated virtual function overrides 8A::q;  
  //{{AFX_VIRTUAL(CHookApp) jaavh6h)  
 public: \!w |  
  virtual BOOL InitInstance(); zuFPG{^\#  
  virtual int ExitInstance(); qzO5p=}  
  //}}AFX_VIRTUAL suFk<^3  
  //{{AFX_MSG(CHookApp) WIAukM8~  
  // NOTE - the ClassWizard will add and remove member functions here. k{hNv|:,  
  // DO NOT EDIT what you see in these blocks of generated code ! BnDCK@+|Q  
  //}}AFX_MSG ""_G4{  
  DECLARE_MESSAGE_MAP() .yD 6$!6  
}; l]Ym)QP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 5j0 Ib>\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !h<O c!9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Gxxz4    
BOOL InitHotkey(); B(} 'yY@%u  
BOOL UnInit(); vM$hCV ~N  
#endif {^:NII]  
EQw7(r|v:  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Di}M\!-[  
#include "stdafx.h" F?cwIE\J  
#include "hook.h" =*zde0T?l  
#include <windowsx.h> Q7d@+C  
#ifdef _DEBUG <%rm?;PBl  
#define new DEBUG_NEW G$QN_h,}  
#undef THIS_FILE Ho[]03  
static char THIS_FILE[] = __FILE__; :V@)A/}uk  
#endif PDz:x4A  
#define MAX_KEY 100 UlNV%34"  
#define CTRLBIT 0x04 m I:^lp  
#define ALTBIT 0x02 R7!v=X]i  
#define SHIFTBIT 0x01 ?2\oi*$  
#pragma data_seg("shareddata") Qgv g*KX  
HHOOK hHook =NULL; z}7}D !  
UINT nHookCount =0; YTTi j|(  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey &@BAVc z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Ai^0{kF6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey JL{fW>5y|  
static int KeyCount =0; J~oxqw}  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 2dHsM'ze  
#pragma data_seg() x'OP0],#  
HINSTANCE hins; * {~`Lw)y  
void VerifyWindow(); +9pock  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) DnG9bVm>  
//{{AFX_MSG_MAP(CHookApp) z}Us+>z+jc  
// NOTE - the ClassWizard will add and remove mapping macros here. #T{)y  
// DO NOT EDIT what you see in these blocks of generated code! F+ RE  
//}}AFX_MSG_MAP b35 3+7"|  
END_MESSAGE_MAP() '=\>n(%Q  
utl-#Wwt/  
CHookApp::CHookApp() #sg dMrVQ  
{ "68X+!  
 // TODO: add construction code here, cu'(Hj  
 // Place all significant initialization in InitInstance G)M! , Q  
} o`7 Z<HF  
ZH>i2|W<  
CHookApp theApp; T\= #y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Zs-lN*u7.  
{ (\r^ 0>H  
 BOOL bProcessed=FALSE; /0fHkj/J=B  
 if(HC_ACTION==nCode) L%<]gJtrO  
 { ZJF+./vN  
  if((lParam&0xc0000000)==0xc0000000){// Key up `g)  
   switch(wParam) B*Om\I  
   { HVhd#Q;  
    case VK_MENU: UugR  
     MaskBits&=~ALTBIT; K=}Eupn=  
     break; _Ex<VF u  
    case VK_CONTROL: R?/xH=u>  
     MaskBits&=~CTRLBIT; ?~.:C'  
     break; ?,+&NX3m  
    case VK_SHIFT: 'jO8C2Th%  
     MaskBits&=~SHIFTBIT; l]Xbd{  
     break; B4*y-Q.*  
    default: //judge the key and send message xO<%lq`  
     break; !_~ /Y/M  
   } _5(1T%K)  
   for(int index=0;index<MAX_KEY;index++){ +xsGa{`  
    if(hCallWnd[index]==NULL) "USzk7=&.  
     continue; %6Vb1?x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kzNRRs\e  
    { KK4e'[Wf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (!J;g|58  
     bProcessed=TRUE; Gm9  
    } ?9!9lSH6%  
   } H+]h+K9\7  
  } 3/uvw>$  
  else if((lParam&0xc000ffff)==1){ //Key down LHu  
   switch(wParam) +Wy`X5v  
   { |:4?K*w",  
    case VK_MENU: ],~[^0  
     MaskBits|=ALTBIT; -1NR]#P'  
     break; @g+v2(f2v  
    case VK_CONTROL: 0=t2|,}  
     MaskBits|=CTRLBIT; .J&89I]U  
     break; S'w}Ir  
    case VK_SHIFT: Y  9z*xS  
     MaskBits|=SHIFTBIT; 05\0g9  
     break; .a(G=fk  
    default: //judge the key and send message }$qrNbLJ  
     break; skTa IGRL  
   } r$'.$k\  
   for(int index=0;index<MAX_KEY;index++) ]@Z nP,8  
   { &(l.jgqg&  
    if(hCallWnd[index]==NULL) in,0(I&I  
     continue; ,Shzew+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wq!9wk9  
    { $sg-P|Wo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); YWDgRb  
     bProcessed=TRUE; j8bA"r1  
    } +]NpcE'  
   } L:mE)Xq2  
  } T /IX(b'<  
  if(!bProcessed){ `d4xX@  
   for(int index=0;index<MAX_KEY;index++){ 92.Rjz;=9?  
    if(hCallWnd[index]==NULL) IR:{{ (  
     continue; ,`!lZ| U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z8%qCq  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); * a1q M?  
   } ;mz#$"(  
  } qwnVtD  
 } "oFi+']*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); f}4A ,%:1  
} s'l|Ii  
&`vThs[x  
BOOL InitHotkey() V>Xg\9B_  
{ ydY 7 :D  
 if(hHook!=NULL){ vlZmmQeJm  
  nHookCount++; !O}e)t  
  return TRUE; 3XQe? 2:<  
 } *)I^+zN  
 else YO?o$Hv16  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); $]}K;  
  if(hHook!=NULL) P O0Od z  
   nHookCount++; gi5X ,:[  
  return (hHook!=NULL); 8\:>;XG6f  
} LikCIO  
BOOL UnInit() x5pu+-h  
{ yM9>)SE5`  
 if(nHookCount>1){ *b 0z/ 6  
  nHookCount--; 89{;R  
  return TRUE; C"0 VOb  
 } $3&XM  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Ex*{iJ;\  
 if(unhooked==TRUE){ KydAFxUb  
  nHookCount=0; 0Bkz)4R  
  hHook=NULL; qxHn+O!h  
 } )dEcKH<#  
 return unhooked; KD+&5=Y  
} AGS(ud{  
gM]E8%;{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &0|Z FXPd  
{ *14:^neoI  
 BOOL bAdded=FALSE; w\N\J^5,Q  
 for(int index=0;index<MAX_KEY;index++){ F6Q%<p a  
  if(hCallWnd[index]==0){ c'Ibgfx%m  
   hCallWnd[index]=hWnd; 7^M$u\a)U  
   HotKey[index]=cKey; GVn'p Wg  
   HotKeyMask[index]=cMask; \Zx&J.D  
   bAdded=TRUE; <ME>#,  
   KeyCount++; :7obxW1X  
   break; +|pYu<OY  
  } 4tUt"N  
 } ~7g$T Ae{  
 return bAdded; o]qwN:8^  
} 3W#E$^G_v  
2$!,$J-<Y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J9j @V4  
{ #=ij</  
 BOOL bRemoved=FALSE; #;@I.  
 for(int index=0;index<MAX_KEY;index++){ ,2^A<IwR  
  if(hCallWnd[index]==hWnd){ S'ms>ZENC  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ KQ81Oxu*C  
    hCallWnd[index]=NULL; iPWr-  
    HotKey[index]=0; Y= =5\;-  
    HotKeyMask[index]=0; qIQ 61><  
    bRemoved=TRUE; (0`w.n  
    KeyCount--; c9CFGo?)N  
    break; o&z[d  
   } Ef ?|0Gm  
  } =Bm|9A1  
 } \*b  .f  
 return bRemoved; YN<vOv  
} !dh:jPpKq  
Gx}`_[-  
void VerifyWindow() r#& JfAo  
{ &V+KM"Ow  
 for(int i=0;i<MAX_KEY;i++){ X%(NI(+x,  
  if(hCallWnd!=NULL){ T:2f*!r  
   if(!IsWindow(hCallWnd)){ 3k(tv U+eC  
    hCallWnd=NULL; ?K2}<H-  
    HotKey=0; I\c7V~^hnG  
    HotKeyMask=0; ONy\/lu|  
    KeyCount--; E.ji;5  
   } &N6[*7  
  } Y}t)!}p$r  
 } XIZN9/;  
} *o:J 4'  
vZ57 S13  
BOOL CHookApp::InitInstance()  iD])E/  
{ z#P`m,~t0  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); `{ HWk^  
 hins=AfxGetInstanceHandle(); B>=D$*_  
 InitHotkey(); =2NrmwWZs  
 return CWinApp::InitInstance(); W+U0Y,N6  
} y&O?`"Uv/M  
&HAu;u@  
int CHookApp::ExitInstance() ~jHuJ` ]DF  
{ Vky]In=  
 VerifyWindow(); mEi(DW)(  
 UnInit(); nHq4f&(H  
 return CWinApp::ExitInstance(); XK@&$~iA3  
} )S`[ gK  
g"kI1^[nj  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file }' Y)"8AIA  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) e?B}^Dk0i  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ r%iFsV_  
#if _MSC_VER > 1000 /3SEu(d!  
#pragma once t6mv  
#endif // _MSC_VER > 1000 }mIN)o  
Is<XMR|{  
class CCaptureDlg : public CDialog AJ& j|/  
{ 4pQf*l8e  
 // Construction +)fl9>Mb  
 public: @M-+-6+  
  BOOL bTray; rs R0V+(W  
  BOOL bRegistered; !s]LWCX+|  
  BOOL RegisterHotkey(); QMfa~TH#p  
  UCHAR cKey; 5Qik{cWxBq  
  UCHAR cMask; NVMhbpX6  
  void DeleteIcon(); h+x"?^   
  void AddIcon(); x.+}-(`W#~  
  UINT nCount; 5"5D(  
  void SaveBmp(); ( {H5k''  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Rt<8 &.m4  
  // Dialog Data !ldb_*)h  
  //{{AFX_DATA(CCaptureDlg) & ;+u.X  
  enum { IDD = IDD_CAPTURE_DIALOG }; 5B? >.4R  
  CComboBox m_Key; wvm`JOP:A  
  BOOL m_bControl; |Y!#`  
  BOOL m_bAlt; Y$ ;C@I  
  BOOL m_bShift; ']+-u{+#  
  CString m_Path; 1Q6WpS  
  CString m_Number; |wZ8O}O{E  
  //}}AFX_DATA F}A@H<?  
  // ClassWizard generated virtual function overrides x aWmwsym  
  //{{AFX_VIRTUAL(CCaptureDlg) P.RlozF5;  
 public: ":*PC[)W  
  virtual BOOL PreTranslateMessage(MSG* pMsg); x(z[S$6Y\  
 protected: ~3.1. 'A  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I#kK! m1Q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); z$E+xZ  
  //}}AFX_VIRTUAL pI |;  
  // Implementation ]}cai1  
 protected: Mrp'wF D  
  HICON m_hIcon; 8Z!+1b  
  // Generated message map functions 9 I> 3p4]  
  //{{AFX_MSG(CCaptureDlg) @#}9?>UV  
  virtual BOOL OnInitDialog(); vS:%(Y"!<  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); pAYH"Q6~)I  
  afx_msg void OnPaint(); dvk? A$  
  afx_msg HCURSOR OnQueryDragIcon(); tqIz$84G  
  virtual void OnCancel(); s&p*.I]@>  
  afx_msg void OnAbout(); ](vsh gp2  
  afx_msg void OnBrowse(); Z xLjh  
  afx_msg void OnChange(); %,GY&hTw  
 //}}AFX_MSG SU9#Y|I  
 DECLARE_MESSAGE_MAP() Pn5@7~  
}; lC +p2OG^[  
#endif tgDmHxB]0  
AU}P`fT!  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file pK#Ze/!  
#include "stdafx.h" SG8H~]CO)  
#include "Capture.h" z_eP  
#include "CaptureDlg.h" 5,'?NEyw  
#include <windowsx.h> [SgP1>M  
#pragma comment(lib,"hook.lib") sf]y\_zU  
#ifdef _DEBUG #"6(Q2| l  
#define new DEBUG_NEW EW1 L!3K  
#undef THIS_FILE &3>ki0L  
static char THIS_FILE[] = __FILE__; -3X#$k8  
#endif >>wb yj8  
#define IDM_SHELL WM_USER+1 ;"&^ckP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zGu(y@o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C8y 3T/G  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [zK|OMxoV  
class CAboutDlg : public CDialog @dcT8 YC  
{ 9tXLC|yl?  
 public: *"0Yr`)S  
  CAboutDlg(); ,qpn4`zE~  
  // Dialog Data ,-t3gc1~X  
  //{{AFX_DATA(CAboutDlg) Nm#VA.~  
  enum { IDD = IDD_ABOUTBOX }; $g _h9L  
  //}}AFX_DATA A L}c-#GG  
  // ClassWizard generated virtual function overrides Xd66"k\b+  
  //{{AFX_VIRTUAL(CAboutDlg) e%j+,)Ry  
 protected: : KZI+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7C ABM  
  //}}AFX_VIRTUAL }3Pz{{B&+O  
  // Implementation ;'dw`)~jQ  
 protected: X(1nAeQ  
  //{{AFX_MSG(CAboutDlg) 1&Rz'JQ+  
  //}}AFX_MSG {J%hTjCw  
  DECLARE_MESSAGE_MAP() /Yc!m$uCW  
}; LDW":k|  
A7 .C  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t qbS!r  
{ 'rRo2oTN  
 //{{AFX_DATA_INIT(CAboutDlg) rOB-2@-  
 //}}AFX_DATA_INIT xzy7I6X  
} ,Vt7Kiu  
PX[taDN  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Rs{L  
{ zrE ~%YR  
 CDialog::DoDataExchange(pDX); ${KDGJ,^  
 //{{AFX_DATA_MAP(CAboutDlg) *(s+u~, I  
 //}}AFX_DATA_MAP d37l/I  
} T%KZV/  
%]>c4"H  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8N!E`{W  
 //{{AFX_MSG_MAP(CAboutDlg) HLAWx/c,j"  
 // No message handlers ,$mnD@)  
 //}}AFX_MSG_MAP G|Ic6Sd  
END_MESSAGE_MAP() c&3 ]%urL  
b'O>&V`  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Gk8"fs  
: CDialog(CCaptureDlg::IDD, pParent) z*l3O~mZ  
{ P 5m{}@g  
 //{{AFX_DATA_INIT(CCaptureDlg) uezqC=v$h  
  m_bControl = FALSE; mmAikT#k  
  m_bAlt = FALSE; j.sxyW?3  
  m_bShift = FALSE; $/5Jc[Ow  
  m_Path = _T("c:\\"); 9cWl/7;zXO  
  m_Number = _T("0 picture captured."); W cPDPu~/  
  nCount=0; ,JN2q]QPP  
  bRegistered=FALSE; 1s=M3m&H  
  bTray=FALSE; K/+5$SjF  
 //}}AFX_DATA_INIT K&9|0xt  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *ZKI02M  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); rv&(yA  
} S$+vRX7  
,4jkTQ*@2  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) wZh&w<l'  
{ %(Nu"3|$K=  
 CDialog::DoDataExchange(pDX); ._~_OVU  
 //{{AFX_DATA_MAP(CCaptureDlg) (X,Ua+{  
  DDX_Control(pDX, IDC_KEY, m_Key); @ _U]U  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); MJV)| 2C  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Iujly f  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?a7PxD.  
  DDX_Text(pDX, IDC_PATH, m_Path); n wToZxHZ~  
  DDX_Text(pDX, IDC_NUMBER, m_Number); syA*!Up  
 //}}AFX_DATA_MAP CVo@zr$  
} K\nN2y  
f`.8.1Rd  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) O>w Gc8Of\  
//{{AFX_MSG_MAP(CCaptureDlg) `ndesP  
 ON_WM_SYSCOMMAND() xSs);XO,  
 ON_WM_PAINT() 2Auhv!xV  
 ON_WM_QUERYDRAGICON() gtyo~f  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) MmI4J$F  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) rBkLwJ]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) "8&pT^  
//}}AFX_MSG_MAP 7!#x-KR~5  
END_MESSAGE_MAP() "nU5c4   
efy65+~GG  
BOOL CCaptureDlg::OnInitDialog()  >zFe)  
{ tlV>  
 CDialog::OnInitDialog(); 93XTumpV  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &v Lz{  
 ASSERT(IDM_ABOUTBOX < 0xF000); ,icgne1j  
 CMenu* pSysMenu = GetSystemMenu(FALSE); '+?AaR&p?  
 if (pSysMenu != NULL) ?!U=S=8  
 { }BKEz[G(  
  CString strAboutMenu; 2S&e!d-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ]U!vZY@\  
  if (!strAboutMenu.IsEmpty()) f'0n^mSP  
  { aA-A>z  
   pSysMenu->AppendMenu(MF_SEPARATOR); \-0@9E<D  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `L`qR,R  
  } [pUw(KV2m  
 } wV+ W(  
 SetIcon(m_hIcon, TRUE); // Set big icon D!h8NZ;El  
 SetIcon(m_hIcon, FALSE); // Set small icon 9AD`,]b  
 m_Key.SetCurSel(0); C~ t?<  
 RegisterHotkey(); am{f<v,EI  
 CMenu* pMenu=GetSystemMenu(FALSE); ^I~2t|}  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); h8Q+fHDYv  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S 3Tp__  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9JBPE  
 return TRUE; // return TRUE unless you set the focus to a control (8TB*BhQ_  
} 53J!iNnXT6  
dFS>uIT7X  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +(x^5~QX  
{ !jN}n)FSq  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) <|c n Qj*  
 { mM!'~{r[-  
  CAboutDlg dlgAbout; <{bQl L  
  dlgAbout.DoModal(); )XmV3.rI  
 } }&I\a  
 else "XT7;!  
 { ]|it&4l  
  CDialog::OnSysCommand(nID, lParam); Tz4,lwuWX7  
 } uz-,)  
} +D[|L1{xb  
'$YB -  
void CCaptureDlg::OnPaint() +>/ariRr  
{ rdhK&5x*  
 if (IsIconic()) onRxe\?D(  
 { t.$3?"60~  
  CPaintDC dc(this); // device context for painting  H;s  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); CnSfGsE>  
  // Center icon in client rectangle dF:@BEo  
  int cxIcon = GetSystemMetrics(SM_CXICON); QO0}-wZR  
  int cyIcon = GetSystemMetrics(SM_CYICON); ']Gqa$(YC  
  CRect rect; k"&l o h  
  GetClientRect(&rect); 'DO^($N  
  int x = (rect.Width() - cxIcon + 1) / 2; >A5R  
  int y = (rect.Height() - cyIcon + 1) / 2; %@#+Xpa+  
  // Draw the icon ^hzlR[  
  dc.DrawIcon(x, y, m_hIcon); U`N|pPe:w  
 } a yn6k=F  
 else \ T/i]z  
 { nDu f<mw  
  CDialog::OnPaint(); ^E\{&kaUp  
 } <nlZ?~%}  
} _BO:~x  
LSQWveZz  
HCURSOR CCaptureDlg::OnQueryDragIcon() +%Q:  
{ ,A`d!{]5  
 return (HCURSOR) m_hIcon; 0{^vqh.La  
} 1 rKKph  
u.sF/T=6f  
void CCaptureDlg::OnCancel() R*a5bKr  
{ d9>*a$x;/  
 if(bTray) k"D6Vyy`  
  DeleteIcon(); X TEC0s"F  
  CDialog::OnCancel(); $R(?@B(  
} 5b45u 6  
x|U~?  
void CCaptureDlg::OnAbout() F-[zuYGp  
{ 7[h_"@_A7  
 CAboutDlg dlg; NAjY,)>'K  
 dlg.DoModal(); [ -"o5!0<  
} i!+D ,O  
BLZ#vJR  
void CCaptureDlg::OnBrowse() 6r! Y ~\@  
{ 4 AZ~<e\  
 CString str; Ls{z5*<FM  
 BROWSEINFO bi; b&[9m\AX`  
 char name[MAX_PATH]; aSdh5?  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); H e ABU(o4  
 bi.hwndOwner=GetSafeHwnd(); W&CQ87b  
 bi.pszDisplayName=name; <k?ofE1o  
 bi.lpszTitle="Select folder"; b~fX=!M  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ]x1MB|a6  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); E .^5N~.  
 if(idl==NULL) f2Zi.?``H  
  return; 28FC@&'H  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); mAMi-9  
 str.ReleaseBuffer(); **_`AM~  
 m_Path=str; 56gpAc  
 if(str.GetAt(str.GetLength()-1)!='\\') t\~lGG-p  
  m_Path+="\\"; pYZ6-s  
 UpdateData(FALSE); _nu,ks+  
} Tlrr02>B{  
JwCv(1$GM  
void CCaptureDlg::SaveBmp() u$ [R>l9  
{ +13h *  
 CDC dc; wI.i\ S  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Vcn04j#Q  
 CBitmap bm; ?~~sOf AP  
 int Width=GetSystemMetrics(SM_CXSCREEN); Z0&^U#]  
 int Height=GetSystemMetrics(SM_CYSCREEN); S^q)DuF5!  
 bm.CreateCompatibleBitmap(&dc,Width,Height); *uHL'Pe;m  
 CDC tdc; uo0g51%9  
 tdc.CreateCompatibleDC(&dc); 'f&o%5]  
 CBitmap*pOld=tdc.SelectObject(&bm); RrrW0<Ed  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); u.;zz'|  
 tdc.SelectObject(pOld); ^kZfE"iE2  
 BITMAP btm; "<o[X ?u  
 bm.GetBitmap(&btm); $jT&]p  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 2WQKj9iyN  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); A{\#.nC/z  
 BITMAPINFOHEADER bih; @_"B0$,-i  
 bih.biBitCount=btm.bmBitsPixel; 1=BDqSZ@9  
 bih.biClrImportant=0; Td#D\d\R  
 bih.biClrUsed=0; @P=St\;VP  
 bih.biCompression=0; OS8 ^mC  
 bih.biHeight=btm.bmHeight; I)#=#eI* :  
 bih.biPlanes=1; o?n lnoe  
 bih.biSize=sizeof(BITMAPINFOHEADER); M|!^ #!a(  
 bih.biSizeImage=size; kk]f*[Zi5  
 bih.biWidth=btm.bmWidth; gXr"],OM;  
 bih.biXPelsPerMeter=0; @3`:aWda  
 bih.biYPelsPerMeter=0; H QHFD0hv  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KHwzQ<Z3  
 static int filecount=0; AA][}lU:5  
 CString name; z_qy >  
 name.Format("pict%04d.bmp",filecount++); [h>|6%sW  
 name=m_Path+name; <$\vL   
 BITMAPFILEHEADER bfh; s ^NO(  
 bfh.bfReserved1=bfh.bfReserved2=0; mF!/8qk   
 bfh.bfType=((WORD)('M'<< 8)|'B'); [ZwZGAP  
 bfh.bfSize=54+size; ` nBCCz'Y!  
 bfh.bfOffBits=54; n Q|4.e;  
 CFile bf; FR~YO|4?  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5 o:VixZf  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); C${{&$&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u] C/RDTH  
  bf.WriteHuge(lpData,size); TymE(,1  
  bf.Close(); hUirvDvX  
  nCount++; q6A!xQs<  
 } 9pPb]v,6  
 GlobalFreePtr(lpData); 6o@}k9AN  
 if(nCount==1) 89@\AjI  
  m_Number.Format("%d picture captured.",nCount); 8N<0|u  
 else .G[y^w)w}  
  m_Number.Format("%d pictures captured.",nCount); o(xRq;i  
  UpdateData(FALSE); #_yQv?J  
} r fqw/o  
z0J$9hEg89  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ^NJ]~h{n$  
{ Zgp]s+%E  
 if(pMsg -> message == WM_KEYDOWN) [6x-c;H_4  
 { 0_yE74i  
  if(pMsg -> wParam == VK_ESCAPE) shW$V93<  
   return TRUE; U3r[ysf  
  if(pMsg -> wParam == VK_RETURN) ( Lj{V}^  
   return TRUE; \)'nxFKqV  
 } `|K,E  
 return CDialog::PreTranslateMessage(pMsg); b?Wg|D  
} WqN=  D5  
\m-fLX  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~~:w^(s9  
{ j,Sg?&"%=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ }Ictnb  
  SaveBmp(); "=4`RM  
  return FALSE; {Z[yY6Nu  
} rQiX7  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ EubR] ckB  
 CMenu pop; SNP.n))   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); d_9Fc" C~  
 CMenu*pMenu=pop.GetSubMenu(0); Hj ]$  
 pMenu->SetDefaultItem(ID_EXITICON); v+-f pl&  
 CPoint pt; U$a Eby.  
 GetCursorPos(&pt); iO=xx|d  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }HS:3Dt  
 if(id==ID_EXITICON) yu"Ii-9z  
  DeleteIcon(); "sLdkd}dj  
 else if(id==ID_EXIT) <4jQbY;  
  OnCancel();  f])?Gw  
 return FALSE; 1lyJ;6i6L  
} &d`T~fl|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0 eZfHW&  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) &{QB}r  
 AddIcon(); G)gf +)W  
 return res; 8?] :>  
} '$Jt}O  
eydVWVN  
void CCaptureDlg::AddIcon() ln.kEhQ3B  
{ <'A>7M~h?*  
 NOTIFYICONDATA data; C%d 4ItB >  
 data.cbSize=sizeof(NOTIFYICONDATA); 7}bjJR "  
 CString tip; ];Whvdnv  
 tip.LoadString(IDS_ICONTIP); JV'd!5P  
 data.hIcon=GetIcon(0); 7SzY0})<U  
 data.hWnd=GetSafeHwnd(); K#M h  
 strcpy(data.szTip,tip); g!n1]- 1  
 data.uCallbackMessage=IDM_SHELL; ,oe e'  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; PJj{5,#@3  
 data.uID=98; || ?B1  
 Shell_NotifyIcon(NIM_ADD,&data); 5A1oZ+C#  
 ShowWindow(SW_HIDE); Rs B o\#`  
 bTray=TRUE; EQPZV K/  
} Sp)KtMV  
SCeZt [  
void CCaptureDlg::DeleteIcon() RAKQ+Y"nl  
{ ANSvZqKh  
 NOTIFYICONDATA data; 9[DQ[bL  
 data.cbSize=sizeof(NOTIFYICONDATA); nPq\J~M  
 data.hWnd=GetSafeHwnd(); 47I:o9E  
 data.uID=98; sBuJK'  
 Shell_NotifyIcon(NIM_DELETE,&data); LLmgk"  
 ShowWindow(SW_SHOW); tW5 \Ktjno  
 SetForegroundWindow(); a:@9GmtV&  
 ShowWindow(SW_SHOWNORMAL); vy/U""w`  
 bTray=FALSE; kF'^!Hp  
} #1Mk9sxo  
Ff>Y<7CQ v  
void CCaptureDlg::OnChange() pH#&B_S6z=  
{ b qB[ vPsI  
 RegisterHotkey(); R7*Jb-;$!  
} 6A M,1  
l^xkXj  
BOOL CCaptureDlg::RegisterHotkey() qGkrG38K  
{ ~ C5iyXR  
 UpdateData(); !mBsDn(J  
 UCHAR mask=0; X[k-J\  
 UCHAR key=0; A(_AOoA'  
 if(m_bControl) B%6bk.  
  mask|=4; L5T)_iQ5  
 if(m_bAlt) ^ vI|  
  mask|=2; oSNB\G<  
 if(m_bShift) 80$P35Q"  
  mask|=1; ]Oc :x  
  key=Key_Table[m_Key.GetCurSel()]; iMx+y5O  
 if(bRegistered){ 2a.NWJS  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7^sU/3z  
  bRegistered=FALSE; bI[!y#_z4  
 } j-gLX  
 cMask=mask; =khjD[muC  
 cKey=key; 7tAWPSwf  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); d1e'!y}R5  
 return bRegistered; js`zQx'  
} ?3SlvKI}H`  
1ISA^< M  
  四、小结 R $'}Z  
6AUzS4O  
  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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