社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 7460阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: :H:}t>X6Vo  
  ^ /eSby  
  一、实现方法 |2` $g  
sWzXl~JbF  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ;8Q?`=a  
SL 5DWZ  
#pragma data_seg("shareddata") " yl"A4p S  
HHOOK hHook =NULL; //钩子句柄 z#67rh {  
UINT nHookCount =0; //挂接的程序数目 u"$HWB~@z  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7#*CWh1BNO  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .ihn@eg  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey I,Y^_(JW  
static int KeyCount =0; 4tu>~ vOE  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 fBh|:2u  
#pragma data_seg() FOyfk$  
BrmFwXLP"  
  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。  xyCcd=  
l zkn B  
  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: 3nGK674;z  
-mdPqVIJn:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR `erQp0fBM  
cKey,UCHAR cMask) .f<,H+m^  
{ /P}tgcs  
 BOOL bAdded=FALSE; :iiTz$yk  
 for(int index=0;index<MAX_KEY;index++){ bvvx(?!  
  if(hCallWnd[index]==0){ p tfADG  
   hCallWnd[index]=hWnd; itMc!bUQ  
   HotKey[index]=cKey; G2k71{jK  
   HotKeyMask[index]=cMask; 8j +;Xlh  
   bAdded=TRUE; 0n^j 50Yq  
   KeyCount++; J=bOw//  
   break; dL"i\5#%A  
  } "2j~3aWj  
 } vv_?ip:t  
 return bAdded; *M5C*}dl  
} uT2cHzqKB  
//删除热键 $l"(tB7d  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0tyU%z{RV  
{ Li$k<AM  
 BOOL bRemoved=FALSE; 82l";;n4p  
 for(int index=0;index<MAX_KEY;index++){ gvt4'kp  
  if(hCallWnd[index]==hWnd){ 0kEq|k9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ur5n{0#  
    hCallWnd[index]=NULL; WL]'lSHa  
    HotKey[index]=0; e.h:9` "*  
    HotKeyMask[index]=0; .v8=zi:7Y  
    bRemoved=TRUE; N=x,96CF  
    KeyCount--; \wd`6  
    break; `N,Jiw;bw  
   } ~<R~Q:T  
  } ai2}vR  
 } 0M.[) @  
 return bRemoved; ZS;kCdL   
} 8\_,Y ji  
AG=1TZI"  
>qZRIDE5$  
  DLL中的钩子函数如下: %uMsXa  
y[eNM6p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) M,lu)~H  
{ y5 +&P  
 BOOL bProcessed=FALSE; -v&srd^  
 if(HC_ACTION==nCode) (#BA{9T,^  
 { 6?~pjMV  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Fm{y.URo  
   switch(wParam) | mX8fRh  
   {  C*<LVW{P  
    case VK_MENU: $nN$"  
     MaskBits&=~ALTBIT; }e w?{  
     break; S)h1e%f, f  
    case VK_CONTROL: =]Bm>67"  
     MaskBits&=~CTRLBIT; =^}2 /vA  
     break; P0<uF`87  
    case VK_SHIFT: \hX^Cn=6  
     MaskBits&=~SHIFTBIT; evP`&23tP  
     break; ~=Sr0+vV  
    default: //judge the key and send message >X,6  
     break; IHfqW?  
   } AS ul  
   for(int index=0;index<MAX_KEY;index++){ v]sGdZ(6-  
    if(hCallWnd[index]==NULL) nV1, ):kh  
     continue; T[J_/DE@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yK;I<8+>_  
    { zE{zX@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !<'R%<E3 Q  
     bProcessed=TRUE; D':A-E  
    } *n\qV*|6bI  
   } 'ZZ/:MvQa  
  } U)6JJv  
  else if((lParam&0xc000ffff)==1){ //有键按下 )/w2]d/9  
   switch(wParam) dY^~^<{Lj  
   { 8'62[e|=7[  
    case VK_MENU: Yzz8:n  
     MaskBits|=ALTBIT; To95WG7G  
     break; VI{1SIhfa  
    case VK_CONTROL: +!wc(N[(2  
     MaskBits|=CTRLBIT; !Ai;S  
     break; yuq E  
    case VK_SHIFT: +ZO*~.zZ  
     MaskBits|=SHIFTBIT; t@v8>J%K  
     break; c=CXj3  
    default: //judge the key and send message OYkd?LN  
     break; 1OKJE(T  
   } ~<3yTl>  
   for(int index=0;index<MAX_KEY;index++){ |,crQ'N'  
    if(hCallWnd[index]==NULL) }W J`q`g  
     continue; Urr1 K)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eX/$[SL[  
    { UgJHSl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~Hf,MLMdTf  
     bProcessed=TRUE; |ipppE=  
    } _4w%U[GT,  
   } 'tj4;+xf^  
  } IG\\RYr  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 / e,lD)  
   for(int index=0;index<MAX_KEY;index++){ Hqk2W*UTl  
    if(hCallWnd[index]==NULL) )sr]}S0  
     continue;  Qy%/+9L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :A[/;|&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); H#:Yw|t  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 im`^_zebj  
   } 9v A`\\9  
  } 4+0Zj+ q";  
 } 62q-7nV  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Y;WrfO$J  
} -K{ID$!p  
!~#31kL&  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: q]aRJ`9f  
[S%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t+VPX2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _e W*  
<f%9w]  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: zq#o8))4X  
8~bPoWP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3ml|`S  
{ HD>{UU?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) utXcfKdt  
 { e:]$UAzp  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;-F#a+2]!  
  SaveBmp(); -MZ Eli g  
  return FALSE; pJI H_H  
 } "#()4.9  
 …… //其它处理及默认处理 ^/,s$dj  
} Us<lWEX;k  
XN Y(@  
* HVO  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 {+ m)*3~w  
K:0RP?L  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 n.)-aRu[  
#r C% \  
  二、编程步骤 K{c^.&6D  
2;3q](d   
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; =[$*PTe  
JmK+#o  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; z)0Fk  
LImD]e`  
  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; sdY6_HtE  
!dGgLU_  
  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; 9D bp`%j  
Kr<O7t0X  
  5、 添加代码,编译运行程序。 6\bbP>ql  
s}.nh>Q  
三、程序代码 AxeWj%w@  
>/>a++19  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL hN.#ui5 $  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) JBqzQ^[n  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ j EX([J1  
#if _MSC_VER > 1000 ]Vubz54  
#pragma once _^B+Xo@E-  
#endif // _MSC_VER > 1000  _R ]1J0  
#ifndef __AFXWIN_H__ FR&RIFy  
#error include 'stdafx.h' before including this file for PCH REw3>/=  
#endif HZm44y$/  
#include "resource.h" // main symbols [x&&N*>N  
class CHookApp : public CWinApp 1Dbe0u  
{ t :_7 O7  
 public: wNPZ[V:  
  CHookApp(); |(/"IS]  
  // Overrides F"q3p4-<>  
  // ClassWizard generated virtual function overrides 1)%o:Xy o  
  //{{AFX_VIRTUAL(CHookApp) 9}4L 8?2  
 public: qIk6S6  
  virtual BOOL InitInstance(); i|<*EXB"  
  virtual int ExitInstance(); 4bO7rhve  
  //}}AFX_VIRTUAL ?;$g,2n  
  //{{AFX_MSG(CHookApp) DN!EsQ6  
  // NOTE - the ClassWizard will add and remove member functions here. T]:5y_4?[  
  // DO NOT EDIT what you see in these blocks of generated code ! `s+qz  
  //}}AFX_MSG qAU]}Et/  
  DECLARE_MESSAGE_MAP() oxRu:+N  
}; Qcw/>LaL:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); k_ skn3,u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \+,jM6l}-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BKIt,7j  
BOOL InitHotkey(); n4:WM+f4  
BOOL UnInit(); 27MgwX NQ  
#endif %VdJ<=@  
qP"m819m  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1q*3V8  
#include "stdafx.h" sU`#d  
#include "hook.h" .VI2V-Q  
#include <windowsx.h> Un<~P@T%  
#ifdef _DEBUG 'HC4Q{b`  
#define new DEBUG_NEW 4fN<pG,  
#undef THIS_FILE *33Zt+  
static char THIS_FILE[] = __FILE__; m^ILcp!  
#endif i^n&K:6  
#define MAX_KEY 100 }SYvGp{J,  
#define CTRLBIT 0x04 =IUTU4!]  
#define ALTBIT 0x02 V'9 k;SF  
#define SHIFTBIT 0x01 ;%U`P8b!  
#pragma data_seg("shareddata") :!R+/5a  
HHOOK hHook =NULL; ,e;(\t:  
UINT nHookCount =0; Z6Mh`:7  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey al5?w{us  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT R4o_zwWgPw  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey v(af aN  
static int KeyCount =0; Fv3fad@x  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #R)$nv:h?^  
#pragma data_seg() !6kLg1  
HINSTANCE hins; 8\[6z0+;  
void VerifyWindow(); Q=+KnE=h  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) <@?bYp  
//{{AFX_MSG_MAP(CHookApp) 4Iz~3fqB7  
// NOTE - the ClassWizard will add and remove mapping macros here. E)`+1j  
// DO NOT EDIT what you see in these blocks of generated code! 8U-}%D<a  
//}}AFX_MSG_MAP 1|zo -'y  
END_MESSAGE_MAP() ?&Lb6(}e  
/JvNJ f  
CHookApp::CHookApp() kY*D s;  
{ C9~CP8  
 // TODO: add construction code here, LTi0,03l<  
 // Place all significant initialization in InitInstance LOp<c<+aW  
} GI/g@RV  
~O<Bs{8  
CHookApp theApp; /{Nx%PqL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) J3K!@m_\  
{ g n'. 9";j  
 BOOL bProcessed=FALSE; 1(m8 9C[  
 if(HC_ACTION==nCode) <%|2yPb]  
 { %=GnGgu  
  if((lParam&0xc0000000)==0xc0000000){// Key up \s,ZE6dQ  
   switch(wParam) c(@)V.o2  
   { E$RH+):|  
    case VK_MENU: +4)Kc9S#  
     MaskBits&=~ALTBIT; r;9F@/  
     break; h'wI/Z_'  
    case VK_CONTROL: 7ZN0_Q s  
     MaskBits&=~CTRLBIT; !"_\5$5i<X  
     break; fu33wz1$}B  
    case VK_SHIFT: kMUjSa~\  
     MaskBits&=~SHIFTBIT; 65g\WB+/  
     break; oas}8A)  
    default: //judge the key and send message f 1]1ZOb  
     break; }VyD X14j  
   } 3]V" 9+  
   for(int index=0;index<MAX_KEY;index++){ Uc6P@O*,  
    if(hCallWnd[index]==NULL) CY9`ztO*  
     continue; UE*M\r<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hH%@8'1v  
    { 2jA-y!(e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6VIi nuOW  
     bProcessed=TRUE;  d':c  
    } @<l7"y;\  
   } }O8$?7j(  
  } 6tj +  
  else if((lParam&0xc000ffff)==1){ //Key down q&7J1  
   switch(wParam) ^xFZ;Yf  
   { 8n NRn[oS  
    case VK_MENU: bz,C%HFA  
     MaskBits|=ALTBIT; !}<Y^="  
     break; `O*+%/(  
    case VK_CONTROL: D/{hLp{  
     MaskBits|=CTRLBIT; G 9d@vu  
     break; E7ixl~  
    case VK_SHIFT: U }xRvNz  
     MaskBits|=SHIFTBIT; tvavI9  
     break; wU+-;C5e  
    default: //judge the key and send message ]Z6==+mCP  
     break; jo/-'Lf{?  
   } :IvKxOv  
   for(int index=0;index<MAX_KEY;index++)  qauk,t  
   { |h4aJv  
    if(hCallWnd[index]==NULL) 3y<;fdS7  
     continue; 6f(K'v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xV}-[W5sr'  
    { 6o!+E@V b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?o?~Df&  
     bProcessed=TRUE; "1yXOy^2  
    } \$W>@w0  
   } n}}$-xl  
  } L^!E4[ ^4  
  if(!bProcessed){ a}EO7tcg,  
   for(int index=0;index<MAX_KEY;index++){ ZXlW_CGO  
    if(hCallWnd[index]==NULL) : OQx;>'  
     continue;  1ti+ Q0~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $0=f9+@5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Z2!O)8  
   } }y;s(4  
  } %9C_p]P*  
 } .Xqe]cax%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z^'3f!:3  
} :  *k   
?@!dc6   
BOOL InitHotkey()  ]Vuq)#  
{ ha&2V=  
 if(hHook!=NULL){ @Ge\odfF:  
  nHookCount++; ef*Vs  
  return TRUE; kzcl   
 } Z]jm.'@z@  
 else 5R"iF+p4  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); fq-e2MCX5  
  if(hHook!=NULL) BUvE~l.,|  
   nHookCount++; $t}t'uJ  
  return (hHook!=NULL); __O@w.  
} w7+3?'L  
BOOL UnInit() OXAr..  
{ AU0pJB'  
 if(nHookCount>1){ 8A}cxk  
  nHookCount--; @|BaZq,g  
  return TRUE; Te_%r9P|2  
 } > yk2  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?%K7IJ%  
 if(unhooked==TRUE){ }]VFLBl`w  
  nHookCount=0; FX}kH]  
  hHook=NULL; V $Y=JK@  
 } <#HQU<  
 return unhooked; ROqz$yY  
} VI_8r5o  
}04 EM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G6@XRib3  
{ Jvac|rN  
 BOOL bAdded=FALSE; X"lPXoCN  
 for(int index=0;index<MAX_KEY;index++){ 0&wbGbg(W  
  if(hCallWnd[index]==0){ ,sF49C D  
   hCallWnd[index]=hWnd; l=4lhFG,Mk  
   HotKey[index]=cKey; qJN!L))  
   HotKeyMask[index]=cMask; Ps<;DE\$f4  
   bAdded=TRUE; =cz^g^7  
   KeyCount++; <MdIQ;I8  
   break; oU"!"t  
  } ~FCkr&Ky3  
 } \7]0vG  
 return bAdded; 0;6eSmF  
} l4: B(  
tr?U/YG  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [C@ |q Ah  
{ !W2dMD/  
 BOOL bRemoved=FALSE; A~0eJaq+  
 for(int index=0;index<MAX_KEY;index++){ lFJDdf2:$C  
  if(hCallWnd[index]==hWnd){ z'"e|)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Es]:-TR  
    hCallWnd[index]=NULL; !:BmDX[<n  
    HotKey[index]=0; ?5VPV9EX  
    HotKeyMask[index]=0; '/O >#1  
    bRemoved=TRUE; ^W#161&  
    KeyCount--; Z/G`8|A  
    break; 8=kIN-l_  
   } 7F$G.LhMw  
  } 2;2FyKF(  
 } Iy[TEB  
 return bRemoved; D[i?T3i  
} 05SK$ Y<<  
h[*:\P`  
void VerifyWindow() F .h A.E  
{ v=8sj{g3,3  
 for(int i=0;i<MAX_KEY;i++){ >8;EeRvI  
  if(hCallWnd!=NULL){ Nl$b;~ u  
   if(!IsWindow(hCallWnd)){ L*(Sh2=_  
    hCallWnd=NULL;  :d) y  
    HotKey=0; % H/V iC  
    HotKeyMask=0; u7(<YSOs  
    KeyCount--; -}x( MZ  
   } GUDz>(  
  } ! mb<z^>5  
 } ^ jYE4gHM  
} Q  h~  
K&'Vd@  
BOOL CHookApp::InitInstance() ' Bx"i  
{ ,::f? Gc7j  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (baBi9<P=  
 hins=AfxGetInstanceHandle(); e|1.-P@  
 InitHotkey(); W6^YFN  
 return CWinApp::InitInstance(); [ikW3 '99,  
} yt+d f0l  
M4}b l h#  
int CHookApp::ExitInstance() 5do49H_  
{ $Cnv]1%  
 VerifyWindow(); X+7@8)1(  
 UnInit(); Qo\+FkhYq  
 return CWinApp::ExitInstance(); 1[:tiTG|C  
} rK~Obv  
IeN~ E'~  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file )=TS)C4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) j"5 $m@lgn  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ vX;~m7+  
#if _MSC_VER > 1000 }Gf9.ACQ  
#pragma once /0 2-0mNv  
#endif // _MSC_VER > 1000 )dh_eqnX  
}}b &IA#  
class CCaptureDlg : public CDialog +wIv|zj9  
{ Xte"tf9(C  
 // Construction }'u0Q6Obj  
 public: wNm1H[{  
  BOOL bTray; b=PB"-  
  BOOL bRegistered; 1ir~WFP  
  BOOL RegisterHotkey(); p N+1/m,  
  UCHAR cKey; y^:N^Gt  
  UCHAR cMask; | Kw}S/F  
  void DeleteIcon(); rO[ Zx'a  
  void AddIcon(); / n@by4;W  
  UINT nCount; tRYi q  
  void SaveBmp(); }rA _4%  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor FR^(1+lx&  
  // Dialog Data *f-8egt-  
  //{{AFX_DATA(CCaptureDlg) ]k)h<)nY  
  enum { IDD = IDD_CAPTURE_DIALOG }; v43FU3  
  CComboBox m_Key; (|dN6M-.K  
  BOOL m_bControl; HDQH7Bs  
  BOOL m_bAlt; 8i~n;AhDs  
  BOOL m_bShift; vYNu=vnM  
  CString m_Path; \Xpq=2`  
  CString m_Number; @)x8<  
  //}}AFX_DATA $:IEpV{  
  // ClassWizard generated virtual function overrides f#3!Q!C^  
  //{{AFX_VIRTUAL(CCaptureDlg) m {?uR.O  
 public: U2CCjAgRs  
  virtual BOOL PreTranslateMessage(MSG* pMsg); yL #2|t(  
 protected: kWZ/O  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v=J[p;H^H  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); eh /QFm 4  
  //}}AFX_VIRTUAL M/evZ?uis  
  // Implementation "JpnmE[`  
 protected: 9jf2b  
  HICON m_hIcon; <sor;;T  
  // Generated message map functions q[ 5&  
  //{{AFX_MSG(CCaptureDlg) f9a_:]F  
  virtual BOOL OnInitDialog(); ><w=  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); cz;gz4d8  
  afx_msg void OnPaint(); I?X!v6  
  afx_msg HCURSOR OnQueryDragIcon();  aX}:O  
  virtual void OnCancel(); T{4Ru6[  
  afx_msg void OnAbout(); RxUzJ  
  afx_msg void OnBrowse(); <2ymfL-q  
  afx_msg void OnChange(); "yf#sEabV  
 //}}AFX_MSG !b{7gUjyI  
 DECLARE_MESSAGE_MAP() :<PwG]LO  
}; [DSD[[ z[  
#endif S*'  
7q@>d(xho  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file b |JM4jgK  
#include "stdafx.h" ZnZ`/zNO  
#include "Capture.h" S r4/8BZ  
#include "CaptureDlg.h" 8dCa@r&tz  
#include <windowsx.h> kpx2e2C|  
#pragma comment(lib,"hook.lib") Rd:wMy$  
#ifdef _DEBUG &pN/+,0E  
#define new DEBUG_NEW 7thB1cOJ  
#undef THIS_FILE 'eg;)e:`b+  
static char THIS_FILE[] = __FILE__; w ;]~2$  
#endif ] :n! \G  
#define IDM_SHELL WM_USER+1 hWAZP=H  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "!z9UiA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IiB"F<&[j{  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]vUTb9>{?  
class CAboutDlg : public CDialog cwBf((~  
{ J`[He$7)  
 public: I3" GGp3L  
  CAboutDlg(); xO<Uz"R  
  // Dialog Data &\ \)x.!  
  //{{AFX_DATA(CAboutDlg) *Ry{}|_8  
  enum { IDD = IDD_ABOUTBOX }; 8j jq)d4#  
  //}}AFX_DATA ZE4xF8  
  // ClassWizard generated virtual function overrides $94l('B6H  
  //{{AFX_VIRTUAL(CAboutDlg) ZuVes?&j  
 protected: L%5g]=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }1? 2  
  //}}AFX_VIRTUAL /5r!Fhx  
  // Implementation yQdoy^d/4  
 protected: 7!jb ID~  
  //{{AFX_MSG(CAboutDlg) BjAmM*k  
  //}}AFX_MSG M'}iIO`L  
  DECLARE_MESSAGE_MAP() 'G8.)eTA'  
}; B^lm'/,@  
C?fa-i0l^  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) xSL%1>MrN  
{ PNG!q}(c  
 //{{AFX_DATA_INIT(CAboutDlg) L0EF CQ7  
 //}}AFX_DATA_INIT {/K_NSg+h  
} ~[3B<^e  
m\;@~o'k  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) vj4n=F,Z  
{ WN9K*Tt~o&  
 CDialog::DoDataExchange(pDX); C ]+J  
 //{{AFX_DATA_MAP(CAboutDlg) | x/Z qY  
 //}}AFX_DATA_MAP MNV OloA  
} m+'vrxTY  
!)+8:8H'  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3%DDN\q\u  
 //{{AFX_MSG_MAP(CAboutDlg) " twq#Alx  
 // No message handlers \K%A}gnHe  
 //}}AFX_MSG_MAP  >q^l  
END_MESSAGE_MAP() vY'E+M"+@  
qgk6 \&K[  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %eQw\o,a  
: CDialog(CCaptureDlg::IDD, pParent) V>:ubl8j0l  
{ W=ar&O~}n  
 //{{AFX_DATA_INIT(CCaptureDlg) ;=F]{w]$+  
  m_bControl = FALSE; VtzX I2.2  
  m_bAlt = FALSE; 4pC.mRu 0  
  m_bShift = FALSE; >Z&Y!w'A|u  
  m_Path = _T("c:\\"); *\T ]Z&E"  
  m_Number = _T("0 picture captured."); FCPi U3  
  nCount=0; \A=:6R%Qb  
  bRegistered=FALSE; ' Y cVFi  
  bTray=FALSE; $*z>t*{7  
 //}}AFX_DATA_INIT #t?tt,nc}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 j/PNi@  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); iw?*Wp25  
} 3lT>C'qq  
XXA1%Lw%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 59Lmv &s  
{ Y!nxHRE  
 CDialog::DoDataExchange(pDX); 5&N55? G6  
 //{{AFX_DATA_MAP(CCaptureDlg) a^QyYX}\qR  
  DDX_Control(pDX, IDC_KEY, m_Key); c0Oc-,6J  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); j_Q kw ?   
  DDX_Check(pDX, IDC_ALT, m_bAlt); C,#FH}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \\9$1yg   
  DDX_Text(pDX, IDC_PATH, m_Path); bj`mQMC  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 3gNVnmZG  
 //}}AFX_DATA_MAP ,+hH|$  
} K3On8  
|A%Jx__  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'v:%} qMv  
//{{AFX_MSG_MAP(CCaptureDlg) 9e>Dqlv  
 ON_WM_SYSCOMMAND() p`}'-A|@  
 ON_WM_PAINT() +ew9%={zB  
 ON_WM_QUERYDRAGICON() Ql.abU  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) i_kKE+Q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 76j5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) FatLc|[  
//}}AFX_MSG_MAP ( S=RFd  
END_MESSAGE_MAP() 0Z<&M|G  
[6{o13mCWE  
BOOL CCaptureDlg::OnInitDialog() qt{{q  
{ 'mR9Uqq\  
 CDialog::OnInitDialog(); eV)'@ 8p  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); QM 'Db`B  
 ASSERT(IDM_ABOUTBOX < 0xF000); E0-<-w3'  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *eb2()B%  
 if (pSysMenu != NULL) [K4wd%+  
 { afNqK~  
  CString strAboutMenu; L] ce13K  
  strAboutMenu.LoadString(IDS_ABOUTBOX); }Rx`uRx\  
  if (!strAboutMenu.IsEmpty()) r[Zg$CW  
  { w!N?:}P<N  
   pSysMenu->AppendMenu(MF_SEPARATOR); i>}aQ:&^0  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8,m3]Lg  
  } j!;y!g  
 } :^[HDI-[2  
 SetIcon(m_hIcon, TRUE); // Set big icon Kfl#78$d  
 SetIcon(m_hIcon, FALSE); // Set small icon vk] vtjf&%  
 m_Key.SetCurSel(0); z-X_O32  
 RegisterHotkey(); e ) ?~  
 CMenu* pMenu=GetSystemMenu(FALSE); q|_t=YM@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +M/1,&  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); g&oAa;~o  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;R x Rap  
 return TRUE; // return TRUE unless you set the focus to a control T_=iJ: Q  
} ? j8S.d~  
*%,{<C,Y  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) DpZO$5.Ec+  
{ a][QY1E@?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Yl#|+xYA5[  
 { jJOs`'~Q\  
  CAboutDlg dlgAbout; !0k'fYCa  
  dlgAbout.DoModal(); +'f+0T\)  
 } *dw6>G0U  
 else DLP G  
 { ZI>')T<@j"  
  CDialog::OnSysCommand(nID, lParam); ]1k"'XG4,  
 } jQIb :\0#  
} ?5e]^H}  
$VRVM Y [q  
void CCaptureDlg::OnPaint() +dgHl_,i  
{ W-UMX',0zS  
 if (IsIconic()) 0/@ ^He8l  
 { zXRq) ;s  
  CPaintDC dc(this); // device context for painting -4IHs=`;I  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /suW{8A(E  
  // Center icon in client rectangle eKw!%97>  
  int cxIcon = GetSystemMetrics(SM_CXICON); #lld*I"d  
  int cyIcon = GetSystemMetrics(SM_CYICON); b)1v:X4Bv=  
  CRect rect; F\G-. 1  
  GetClientRect(&rect); AZgeu$:7p<  
  int x = (rect.Width() - cxIcon + 1) / 2; THl={,Rw`  
  int y = (rect.Height() - cyIcon + 1) / 2; 1q7Y,whp  
  // Draw the icon -fm1T|>#  
  dc.DrawIcon(x, y, m_hIcon); !i{9wI  
 } Or9"T]z  
 else 7yM"G$  
 { |2t1m 6\j  
  CDialog::OnPaint(); D{)K00mm  
 } V ~%C me  
} a#L:L8T;j  
5zf bI  
HCURSOR CCaptureDlg::OnQueryDragIcon() 4 [K"e{W3  
{ 'Jl |-RUd  
 return (HCURSOR) m_hIcon; <jwQ&fm)/R  
} "7X[@xX@  
{k"t`uo_  
void CCaptureDlg::OnCancel() ah9P C7[  
{ uihU)]+@t/  
 if(bTray) uZ/XI {/  
  DeleteIcon(); g;n6hXq4  
  CDialog::OnCancel(); kQt#^pO)  
} ><Awk~KR  
3<%ci&B  
void CCaptureDlg::OnAbout() ^_rBEyz@  
{ I)YUGA5  
 CAboutDlg dlg; a F!Im}  
 dlg.DoModal(); \Hs*46@TC  
} &h<\jqN/  
F).7%YfY  
void CCaptureDlg::OnBrowse() wS"`~Ql_  
{ Dm+[cA"I  
 CString str; *&nIxb60b{  
 BROWSEINFO bi; Q dPqcw4+X  
 char name[MAX_PATH]; |mp~d<&  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); gx ]5)O  
 bi.hwndOwner=GetSafeHwnd(); GVK c4HGt  
 bi.pszDisplayName=name; 1&.q#,EMn(  
 bi.lpszTitle="Select folder"; $c0<I59&|  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -2/&i  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]H$Trf:L  
 if(idl==NULL) Svl; Ul  
  return; =73aME}  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); h; "pAE  
 str.ReleaseBuffer(); F +Dke>j  
 m_Path=str; "PePiW(i+  
 if(str.GetAt(str.GetLength()-1)!='\\') &rbkw<=j  
  m_Path+="\\"; %5yP^BL0  
 UpdateData(FALSE); ;Zt N9l  
} j' }4ZwEh  
4Wk`P]?^  
void CCaptureDlg::SaveBmp() #9e2+5s  
{ T jrz_o)  
 CDC dc; 3 n3$?oV  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Xf%vfAf  
 CBitmap bm; %+ : $uk[  
 int Width=GetSystemMetrics(SM_CXSCREEN); >*]dB|2  
 int Height=GetSystemMetrics(SM_CYSCREEN); yE_T#FN  
 bm.CreateCompatibleBitmap(&dc,Width,Height); UY}EW`$#m  
 CDC tdc; \TS.9 >\  
 tdc.CreateCompatibleDC(&dc); /)*si  
 CBitmap*pOld=tdc.SelectObject(&bm); 0 H0U%x8  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); i*jnC>  
 tdc.SelectObject(pOld); Min {&?a  
 BITMAP btm; I1 +A$<Fa  
 bm.GetBitmap(&btm); #\ l#f8(l  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &\iMIJ-  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); C1w6[f1+  
 BITMAPINFOHEADER bih; me YSW  
 bih.biBitCount=btm.bmBitsPixel; U_C[9Z'P  
 bih.biClrImportant=0; O[j$n  
 bih.biClrUsed=0; H.]p\ UY9  
 bih.biCompression=0; 044Q>Qz,  
 bih.biHeight=btm.bmHeight; :2*0Jh3_  
 bih.biPlanes=1; aHkt K/  
 bih.biSize=sizeof(BITMAPINFOHEADER); -,qGEJ  
 bih.biSizeImage=size; b`fWT:?=  
 bih.biWidth=btm.bmWidth; ys- w0H  
 bih.biXPelsPerMeter=0; ">v- CSHY  
 bih.biYPelsPerMeter=0; o\N^Uu  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Egi(z9|Pp  
 static int filecount=0; 9ePR6WS4  
 CString name; Aj{G=AT  
 name.Format("pict%04d.bmp",filecount++); :qvA'.L/;z  
 name=m_Path+name; R+5yyk\  
 BITMAPFILEHEADER bfh; pebNE3`#  
 bfh.bfReserved1=bfh.bfReserved2=0; ^5q}M'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); )CoJ9PO7  
 bfh.bfSize=54+size; TdL/tg!  
 bfh.bfOffBits=54; 2v{42]XYf  
 CFile bf; wJg&OQc9  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ C {G647  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ? ]H'egG6  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); l{8t;!2t  
  bf.WriteHuge(lpData,size); z Ek/#&  
  bf.Close(); 7? ]wAH89  
  nCount++; 1B`JvNtd  
 } S;}/ql y  
 GlobalFreePtr(lpData); BmFtRbR  
 if(nCount==1) ^0(`:*  
  m_Number.Format("%d picture captured.",nCount); q rF:=?`E  
 else ; ]VLA9dC  
  m_Number.Format("%d pictures captured.",nCount); bC,SE*F\  
  UpdateData(FALSE); +HF*X~},i  
} Eyh(257  
I|tn7|*-A[  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {k)H.zwe  
{ I3A xK A  
 if(pMsg -> message == WM_KEYDOWN) 3^`.bm4 ^  
 { d(q2gd@  
  if(pMsg -> wParam == VK_ESCAPE) asJt 6C  
   return TRUE; }w5`Oig[  
  if(pMsg -> wParam == VK_RETURN) 'e*:eBoyb  
   return TRUE; 3A'9=h,lVK  
 } fiQ/ &]|5  
 return CDialog::PreTranslateMessage(pMsg); F-<c.0;6  
} vpP8'f.  
:auq#$B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) X<uH [  
{ @#::C@V]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @5\/L6SRfL  
  SaveBmp(); fl71{jJ_  
  return FALSE; rW[7 _4  
} *lyRy/POB  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ DG/<#SCF  
 CMenu pop; U?8X]  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6Z!OD(/e  
 CMenu*pMenu=pop.GetSubMenu(0); rp!>rM] s  
 pMenu->SetDefaultItem(ID_EXITICON); V&R_A~<T  
 CPoint pt; fvM|Jb  
 GetCursorPos(&pt); 4~e6z(  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); gx=2]~O1(  
 if(id==ID_EXITICON) ee*E:Ltz\  
  DeleteIcon(); f/pr  
 else if(id==ID_EXIT) , R $ZZ4  
  OnCancel(); =%0r_#F%=  
 return FALSE; rlSflcK\\(  
} |c:xK{Ik  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ~c|{PZ9U  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) AUwIF/>F(]  
 AddIcon(); fHacVj J  
 return res; iYz!:TxP  
} p} i5z_tS  
aWMEo`O%  
void CCaptureDlg::AddIcon() 3k* U/*  
{ FQw@ @  
 NOTIFYICONDATA data; \"Aw ATQ  
 data.cbSize=sizeof(NOTIFYICONDATA); 3t$)saQR  
 CString tip; YCu9dBeVS  
 tip.LoadString(IDS_ICONTIP); 2@a]x(  
 data.hIcon=GetIcon(0); Hv .C5mo  
 data.hWnd=GetSafeHwnd(); 8EAkM*D w  
 strcpy(data.szTip,tip); ~ MW_=6U  
 data.uCallbackMessage=IDM_SHELL; "%)^:('Ki  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; v DVE#Nm_  
 data.uID=98; Ks.kn7<l  
 Shell_NotifyIcon(NIM_ADD,&data); S@eI3Pk E  
 ShowWindow(SW_HIDE); z=a{;1A  
 bTray=TRUE; 2w67 >w\  
} 84YZT+TEN  
gf U!sYZ  
void CCaptureDlg::DeleteIcon() Hh0a\%!  
{ ['_G1_p  
 NOTIFYICONDATA data; Hbi2amfBu  
 data.cbSize=sizeof(NOTIFYICONDATA); #AUa'qB t  
 data.hWnd=GetSafeHwnd(); -,} ppTG  
 data.uID=98; 'E~[I"0  
 Shell_NotifyIcon(NIM_DELETE,&data); a[Oi  
 ShowWindow(SW_SHOW); X5wYfN  
 SetForegroundWindow(); Wj#Gm  
 ShowWindow(SW_SHOWNORMAL); 5mF"nY&lI  
 bTray=FALSE; IQQWp@w#8  
} "P {T]  
F<N{ x^  
void CCaptureDlg::OnChange() I:,D:00+  
{ Wo~#R   
 RegisterHotkey(); y1+~IjY  
} or..e  
\k)(:[^FY  
BOOL CCaptureDlg::RegisterHotkey() |csR"DOqz  
{ mdPEF)-  
 UpdateData(); PV/S zfvIq  
 UCHAR mask=0; Mwd(?o  
 UCHAR key=0; o;2QZ"v  
 if(m_bControl) M}BqSzd*  
  mask|=4; 5b-: e? |  
 if(m_bAlt) m\?H < o0  
  mask|=2; Jp]eFaqp  
 if(m_bShift) 7cMSJM(]G  
  mask|=1; PK|"+I0  
  key=Key_Table[m_Key.GetCurSel()]; -%t2_g,  
 if(bRegistered){ _ya_Jf*  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 'hl4cHk14  
  bRegistered=FALSE; J,j!  
 } "R v],O"  
 cMask=mask; -% Z?rn2  
 cKey=key; 8m;tgMFO  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); kZ3w2=x3v  
 return bRegistered; b{wj4  
} o$_,2$>mn  
TEi~X 2u  
  四、小结 ]M5w!O!  
Q`7.-di  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八