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
  • 6031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: e"|9%AW@<  
  wL 5).`oq  
  一、实现方法 6CU8BDN  
xt"/e-h }  
  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: X>|.BvY|  
knBT(x'+  
#pragma data_seg("shareddata") %r!  
HHOOK hHook =NULL; //钩子句柄 .+B)@?  
UINT nHookCount =0; //挂接的程序数目 W3 8 =fyD  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 oaBfq8,;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 *G~c6B Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey m9xu$z| e  
static int KeyCount =0; @3S2Xb{ra1  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 C.(ZXU7  
#pragma data_seg() 6U+#ADo  
+ic~Sar  
  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。 up2%QbN(  
TPEZ"%=Hg  
  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: 3.d=1|E  
LL6f40hC  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR >LU*F|F]B  
cKey,UCHAR cMask) vP~F+z @g  
{ P7y[9|^  
 BOOL bAdded=FALSE; MB |(,{S  
 for(int index=0;index<MAX_KEY;index++){ 6 3u'-Z"4  
  if(hCallWnd[index]==0){ \AK|~:\]  
   hCallWnd[index]=hWnd; 9wb$_j]F`#  
   HotKey[index]=cKey; !J6s^um  
   HotKeyMask[index]=cMask; -owfuS?i=  
   bAdded=TRUE; Vi?Z`G]w!  
   KeyCount++; 8m*\"_S{  
   break; 462ae` 6l  
  } X)&Z{ V>  
 } iN {TTy  
 return bAdded; Dps{[3Y+  
} ~fUSmc  
//删除热键 T i/iD2g  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lb6s3b  
{ q,(&2./  
 BOOL bRemoved=FALSE; q9!#S  
 for(int index=0;index<MAX_KEY;index++){ 7Rh:+bT  
  if(hCallWnd[index]==hWnd){ Q.] )yqX6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 'OihA^e  
    hCallWnd[index]=NULL; aKUr":z  
    HotKey[index]=0; uHIWbF<0oo  
    HotKeyMask[index]=0; w0I /  
    bRemoved=TRUE; }n 7e_qy4  
    KeyCount--; g`6wj|@ =W  
    break; vp|=q;Q%r  
   } Uy1xNb/d  
  } KN`z68c4L  
 } ["IJ h  
 return bRemoved; 9}mp,egV  
} ^U?(g0<"  
 0EB'!  
6K y;1$  
  DLL中的钩子函数如下: /t^lI%&  
iL gt_@g  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (KMobIP^  
{ E!<$J^  
 BOOL bProcessed=FALSE; M^f1D&A  
 if(HC_ACTION==nCode) Cr%r<*s  
 { KEN-G  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 n6Zx0ad?  
   switch(wParam) )89jP088V  
   {  XOwMT,=Z)  
    case VK_MENU: -YyH"f   
     MaskBits&=~ALTBIT; !dH&IEP~  
     break; )It4al^\  
    case VK_CONTROL: 9GwsQ \  
     MaskBits&=~CTRLBIT; NGs9Jke2  
     break; =eoxT  
    case VK_SHIFT: x=#5\t9  
     MaskBits&=~SHIFTBIT; ~?5m5z O  
     break; K@~#Gdnl  
    default: //judge the key and send message 7uxPkZbb  
     break; 4Z<l>!  
   } yj R O9  
   for(int index=0;index<MAX_KEY;index++){ tuUXW5!/  
    if(hCallWnd[index]==NULL) 9y*! W  
     continue; 05 Q8`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  ?|J+dW  
    { cgeS)C7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ee^_Dh4  
     bProcessed=TRUE; PEt8,,x<"  
    } I<K/d  
   } [5*-V^m2  
  } l_-n&(N2<[  
  else if((lParam&0xc000ffff)==1){ //有键按下 D>e\OfTR:  
   switch(wParam) 5a!e%jj  
   { G)Bq?=P  
    case VK_MENU: pQ:PwyU  
     MaskBits|=ALTBIT; = DTOI  
     break; 1 " 7#|=1/  
    case VK_CONTROL: ^p zxwt  
     MaskBits|=CTRLBIT; 4`P2FnJ?  
     break; QU!'W&F6  
    case VK_SHIFT: Q9xx/tUW  
     MaskBits|=SHIFTBIT; @dCPa7:>&  
     break; ]N"F?3J 8  
    default: //judge the key and send message +Cg"2~  
     break; sVdK^|j  
   } ^r_lj$:+$  
   for(int index=0;index<MAX_KEY;index++){ NVqC|uEAF  
    if(hCallWnd[index]==NULL)  5vF}F^  
     continue; 9Y%?)t.2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) '(X[ w=WXy  
    { dX@A%6#?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @IY?DO  
     bProcessed=TRUE; J-\?,4mcP  
    } %SO%{.}Z f  
   } _d| 62VS  
  } 6_5d  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 f THun?Vn  
   for(int index=0;index<MAX_KEY;index++){ ?5v5:U(A  
    if(hCallWnd[index]==NULL) :6j :9lYL2  
     continue; IqCCfsf4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?6iatI !  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4JZHjf0M6  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +Sd,l>8\  
   } zYG,x*IH  
  } U\Ar*b)/T  
 } aR)en{W  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K>cz63}S  
} d$_q=ywc  
.y7)XLC  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: U7"BlT!V\  
3U~lI&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Lubs{-5lk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); y2#>c*  
9S1Ti6A  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: j:e^7|.   
u.kYp  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1U7,X6=~  
{ 27a* H1iQ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]`@]<6  
 { kWs+2j  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^b"bRQqm  
  SaveBmp(); <4Q12:  
  return FALSE; #A3v]'7B  
 } MV<!<Qmj  
 …… //其它处理及默认处理 {M@@)27gW  
} )8$:DW;  
("?&p3];b  
"brRME3  
  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。 mLg{6qm(q  
-MrtliepW*  
  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。 v\ %B  
&"[)s[m+t  
  二、编程步骤 g8I!E$  
"]T$\PJun  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ={`CH CI  
4bi NGl~  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 0iJ!K;A2%  
[7gYd+s  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 3I"NI.>*  
dI^IK  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; /mn-+u`K  
Qz@IK:B}  
  5、 添加代码,编译运行程序。 2mqK3-c  
~+N76BX  
三、程序代码 BTTLy^  
|(V?,^b^ro  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL MzQ\rg_B7  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) (#!] fF"!x  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wjTNO0hj  
#if _MSC_VER > 1000 +VCo$o  
#pragma once 0n:?sFY>  
#endif // _MSC_VER > 1000 o"p^/'ri  
#ifndef __AFXWIN_H__ -AjH}A[!  
#error include 'stdafx.h' before including this file for PCH G'f9N^w  
#endif sM9FE{,mx  
#include "resource.h" // main symbols ;gDMl57PQ.  
class CHookApp : public CWinApp D|d4:;7  
{ 7]Al*)  
 public: .u1X+P7  
  CHookApp(); Al7<s  
  // Overrides A4G,}r *n  
  // ClassWizard generated virtual function overrides kE/`n],1U  
  //{{AFX_VIRTUAL(CHookApp) TE^7P0bh  
 public: HH)"]E5  
  virtual BOOL InitInstance(); 6HoqEku/Q  
  virtual int ExitInstance(); c $0_R;4/  
  //}}AFX_VIRTUAL X8/Tl \c  
  //{{AFX_MSG(CHookApp) ?Z q_9T7  
  // NOTE - the ClassWizard will add and remove member functions here. P|e`^Frxt  
  // DO NOT EDIT what you see in these blocks of generated code ! } h[>U  
  //}}AFX_MSG *q0`})IQ  
  DECLARE_MESSAGE_MAP() Q48+O?&  
}; g"wxC@IR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); zZ%DtxUoU.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1Cm~X$S.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '\`6ot8  
BOOL InitHotkey(); !(Krf  
BOOL UnInit(); g \Wj+el}  
#endif E\0X`QeY  
JqEW= 5  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. !z"Nv1!~|  
#include "stdafx.h" 5[C~wvO  
#include "hook.h" y&"!m }  
#include <windowsx.h> V!4a*,Pz  
#ifdef _DEBUG oid[syPB  
#define new DEBUG_NEW wW:7y>z)  
#undef THIS_FILE ?i~g,P]NK  
static char THIS_FILE[] = __FILE__; +t98 @  
#endif .NJ|p=fy  
#define MAX_KEY 100 +\0T\;-Xe  
#define CTRLBIT 0x04 n`(~O O  
#define ALTBIT 0x02 )6{< i5nJ\  
#define SHIFTBIT 0x01 u$%A#L[  
#pragma data_seg("shareddata") @%1IkvJV  
HHOOK hHook =NULL; i9rS6<V'  
UINT nHookCount =0; 0VN7/=n|  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey GIT #<+"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 8d!GZgC8R  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )%mg(O8uL  
static int KeyCount =0; }`xdWY  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift RRADg^}l|"  
#pragma data_seg() FJeiY#us  
HINSTANCE hins; lCJ6Ur;  
void VerifyWindow(); ?]#OM_,8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [dB$U}SEj  
//{{AFX_MSG_MAP(CHookApp) ;HNq>/{  
// NOTE - the ClassWizard will add and remove mapping macros here. h7]EB!D\A  
// DO NOT EDIT what you see in these blocks of generated code! 5.vG^T0w  
//}}AFX_MSG_MAP 0*8TS7.3  
END_MESSAGE_MAP() Fv8f+)k)Z~  
DkDoA;m  
CHookApp::CHookApp() p@~ic#X  
{ nirDMw[  
 // TODO: add construction code here, :ofBzTNwZ  
 // Place all significant initialization in InitInstance 6cz/n8Mg  
} kJ{+M]pW  
:z&7W<  
CHookApp theApp; e(?]SU|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) VwyVEZt  
{ 7b[wu~'( n  
 BOOL bProcessed=FALSE; jZteooJG|  
 if(HC_ACTION==nCode) w(9*7pp  
 { 3Fs5RC~a  
  if((lParam&0xc0000000)==0xc0000000){// Key up PL X>-7@  
   switch(wParam) dY(;]sxFr  
   { ;Hmp f0$  
    case VK_MENU: t)f-mQz)  
     MaskBits&=~ALTBIT; =Yz'D|=t  
     break; :o46rBs  
    case VK_CONTROL: 8|6 4R:  
     MaskBits&=~CTRLBIT; G2Vv i[c  
     break; ]QVNn?PA8  
    case VK_SHIFT: k(t}^50^j  
     MaskBits&=~SHIFTBIT; v{aq`uH  
     break; W,XTF  
    default: //judge the key and send message h[o6-f<D  
     break; k{;,6H  
   } "ZwKk G  
   for(int index=0;index<MAX_KEY;index++){ !3X0FNGq  
    if(hCallWnd[index]==NULL) 6eFp8bANN#  
     continue;  -I.d}[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >J9oH=S6  
    { 8[vc?+>&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); SAY LG  
     bProcessed=TRUE; V#REjsf,t-  
    } ziPR>iz-  
   } d?wc*N3  
  } br-]fE.be  
  else if((lParam&0xc000ffff)==1){ //Key down 8N&+7FK  
   switch(wParam) VTy9_~q  
   { WOzf]3Xcj  
    case VK_MENU: [AMAa]^  
     MaskBits|=ALTBIT; M?m,EQh.  
     break; |a1{ve[  
    case VK_CONTROL: k:jSbbQ  
     MaskBits|=CTRLBIT; 86]p#n_>Fv  
     break; 7xRl9  
    case VK_SHIFT: A,  3bC  
     MaskBits|=SHIFTBIT; HK`I\,K  
     break; '3zc|eJt&  
    default: //judge the key and send message ;AO#xv+#  
     break; ^8.]d~j  
   } /xtq_*I1S  
   for(int index=0;index<MAX_KEY;index++) T,aW8|  
   { 3k#~yaoI  
    if(hCallWnd[index]==NULL) nt*Hc1I  
     continue; VD_$$Gn*q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S<'[%ihx  
    { PDs@?nz,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .L'.c/ s  
     bProcessed=TRUE; 4R18A=X  
    } % qV 6  
   } hjZKUM G(k  
  } !1e6Ss  
  if(!bProcessed){ +$g}4  
   for(int index=0;index<MAX_KEY;index++){ 9eH$XYy  
    if(hCallWnd[index]==NULL) ` ,SiA-3*  
     continue; w!fE;H8w6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z`:lcF{V  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &mb{.=  
   } ,7<f9 EVY  
  } ^]TVo\,N  
 } <J^MCqp!v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Hy^N!rBxfO  
} iyg*Xbmi~.  
4O35 "1  
BOOL InitHotkey() x QIq^/F0  
{ Mnscb  
 if(hHook!=NULL){ R6]Gk)5  
  nHookCount++; r,h%[JKM  
  return TRUE; RJd(~1  
 } *{L)dW+:  
 else 9b9$GyI  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); !O<)\ )|g  
  if(hHook!=NULL) HhvdqvIEG  
   nHookCount++; d~i+ I5  
  return (hHook!=NULL); sVOyT*GY  
} 5yP\I+Fm  
BOOL UnInit() s+<Yg$)  
{ 0@%v1Oja  
 if(nHookCount>1){ T(U_  
  nHookCount--; ,^\2P$rT  
  return TRUE; bcE._9@@  
 } rR(X9i  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 9-fLz?J  
 if(unhooked==TRUE){ }khV'6"'|  
  nHookCount=0; A;]}m8(*  
  hHook=NULL; YwjKAyLU  
 } [q8 P~l  
 return unhooked; +[\FD; >  
} K3#@SY j  
huh6t !  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0"28'  
{ ).`1+b  
 BOOL bAdded=FALSE; ',JinE95  
 for(int index=0;index<MAX_KEY;index++){ GLeK'0Q@  
  if(hCallWnd[index]==0){ ?kbiMs1;u  
   hCallWnd[index]=hWnd; /rnu<Q#iH  
   HotKey[index]=cKey; {Tq_7,8  
   HotKeyMask[index]=cMask; ix)M`F%P3  
   bAdded=TRUE; _x(o*v[Pt  
   KeyCount++; 2fn&#kw/  
   break; BBwy,\o#  
  } P2#XKG  
 } KBx6NU?;PO  
 return bAdded; uKUiV%p!  
} EyJJ0  
(MxQ+D\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A$Hfr8w1u  
{ \ `~Ly-  
 BOOL bRemoved=FALSE; $P/~rZ@M@  
 for(int index=0;index<MAX_KEY;index++){ rWa2pO  
  if(hCallWnd[index]==hWnd){ X86O lP)eX  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =Y|VgV  
    hCallWnd[index]=NULL; Vc&! OE  
    HotKey[index]=0; G\2 CR*  
    HotKeyMask[index]=0; saBVgSd  
    bRemoved=TRUE; S&Zm0Ku  
    KeyCount--; fI?>+I5  
    break; ayR-\mZ  
   } y" RF;KW>  
  } !Xf5e*1IS  
 } a*lh)l<KV  
 return bRemoved; 46_xyz3+  
} =Y{(%sn  
mqD}BOif  
void VerifyWindow() h7G"G"  
{ >%}C^gu)  
 for(int i=0;i<MAX_KEY;i++){ p& y<I6a,  
  if(hCallWnd!=NULL){ ^oBtfN>4  
   if(!IsWindow(hCallWnd)){ nLbFg0?+t  
    hCallWnd=NULL; \)#kquH/l  
    HotKey=0; Xix L  R  
    HotKeyMask=0; n{n52][J]  
    KeyCount--;  eI$oLl@  
   } 5d Eh7XL  
  } ]sf7{lVT  
 } eenH0Ovv  
} KKj a/p  
XKj|f`  
BOOL CHookApp::InitInstance() W9 GxXPA  
{ SA&Rep^  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Ta ZmRL  
 hins=AfxGetInstanceHandle(); b|l:fT?&  
 InitHotkey(); dyz2.ZY~2  
 return CWinApp::InitInstance(); 6 a(yp3  
} UdT *E: 6  
}|0^EWL  
int CHookApp::ExitInstance() &47i"%  
{ k^3>Y%^1  
 VerifyWindow(); =)0,#9k U]  
 UnInit(); n,vct<&z@  
 return CWinApp::ExitInstance(); $O&b``  
} <GS^  
sJB;3"~  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file dU&a{ $ku[  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {2O1"|s ,  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Jj; L3S  
#if _MSC_VER > 1000 f',Op1o  
#pragma once Sj%u)#Ub  
#endif // _MSC_VER > 1000 f(>p=%=O  
"Gsc;X'id  
class CCaptureDlg : public CDialog Ep9nsX*   
{ Fco`^kql.D  
 // Construction q}i]'7  
 public: *RI]?j%B  
  BOOL bTray; G)EU_UE 9  
  BOOL bRegistered; zU5v /'h>d  
  BOOL RegisterHotkey(); b.2aHu( 3  
  UCHAR cKey; G?L HmTHg  
  UCHAR cMask; pR*VdC _mY  
  void DeleteIcon(); Vh'P&W?[  
  void AddIcon(); @x*c1%wg  
  UINT nCount; ;,hwZZA  
  void SaveBmp(); vLv@&lMW  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor hr#M-K  
  // Dialog Data 8r*E-akuyr  
  //{{AFX_DATA(CCaptureDlg) JA %J$d  
  enum { IDD = IDD_CAPTURE_DIALOG }; H9'$C/w  
  CComboBox m_Key; Gt\lFQ  
  BOOL m_bControl; { }:#G  
  BOOL m_bAlt; U\g/2dM  
  BOOL m_bShift; tIWmp30S  
  CString m_Path; @CpfP;*{w`  
  CString m_Number; !O\82d1P  
  //}}AFX_DATA ..IfP@  
  // ClassWizard generated virtual function overrides ahJ`T*)HY  
  //{{AFX_VIRTUAL(CCaptureDlg) M,j U}yD3  
 public: []\+k31D  
  virtual BOOL PreTranslateMessage(MSG* pMsg); "Bh}}!13  
 protected: TJ2=m 9Z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8EZ$g<}  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $jjfC  
  //}}AFX_VIRTUAL 5VfyU8)7X  
  // Implementation KN^=i5K+Y  
 protected: BOX{]EOj  
  HICON m_hIcon; zykT*V  
  // Generated message map functions 3OrczJ=[UF  
  //{{AFX_MSG(CCaptureDlg) |-fg j'  
  virtual BOOL OnInitDialog(); ^ sOQi6pL  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); us1Hu)  
  afx_msg void OnPaint(); b(,M1.[qt  
  afx_msg HCURSOR OnQueryDragIcon(); S-a]j;U  
  virtual void OnCancel(); I5X|(0es  
  afx_msg void OnAbout(); I&fozO   
  afx_msg void OnBrowse(); 9)h"-H;5:  
  afx_msg void OnChange(); eVEV}`X  
 //}}AFX_MSG \S"isz  
 DECLARE_MESSAGE_MAP() ]{sU&GqBLe  
}; Yz'K]M_Dq  
#endif |.(dq^  
'3R`lv   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 2Sle#nw3  
#include "stdafx.h" hXcyoZ8  
#include "Capture.h" J-[,KME_^  
#include "CaptureDlg.h" g1;:KzVv  
#include <windowsx.h> u]g%@3Pn  
#pragma comment(lib,"hook.lib") ~Z-Vs  
#ifdef _DEBUG fnpYT:%fG  
#define new DEBUG_NEW ^\hG"5#  
#undef THIS_FILE FVMD>=k  
static char THIS_FILE[] = __FILE__; ;d@#XIS&-(  
#endif N,<uf@LQ  
#define IDM_SHELL WM_USER+1 N&.H|5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nyX2|m&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6{@w="VT  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; nB_?ckj,  
class CAboutDlg : public CDialog 1ufp qqk  
{ jqz ux[6{  
 public: ?3/qz(bM  
  CAboutDlg(); #{6{TFx\  
  // Dialog Data S:u:z=:r  
  //{{AFX_DATA(CAboutDlg) mWv3!i;G<s  
  enum { IDD = IDD_ABOUTBOX }; <S5BDk  
  //}}AFX_DATA gK+ 4C  
  // ClassWizard generated virtual function overrides d .[8c=$  
  //{{AFX_VIRTUAL(CAboutDlg) imVo<Je7z(  
 protected:  FK^p")i  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &U{#Kt5q  
  //}}AFX_VIRTUAL AL[KpY  
  // Implementation H(H<z,$}T  
 protected: ~Q*%DRd&Z-  
  //{{AFX_MSG(CAboutDlg) oF vfCrd  
  //}}AFX_MSG .L+6 $8m  
  DECLARE_MESSAGE_MAP()  50"pbzW  
}; W=ig.-  
BfXgh'Z~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) bes<qy  
{ r^2p*nr}  
 //{{AFX_DATA_INIT(CAboutDlg) We)xB  
 //}}AFX_DATA_INIT IWk4&yHUAu  
} !d'GE`w T  
n#mA/H;wV  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Upx G@b  
{ []D&bYpv  
 CDialog::DoDataExchange(pDX); ] ;KJ6  
 //{{AFX_DATA_MAP(CAboutDlg) @<,X0S  
 //}}AFX_DATA_MAP b}\N;D.{  
} 8bxfj<O,  
__uA}f Zp  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SfA\}@3  
 //{{AFX_MSG_MAP(CAboutDlg) \TIT:1  
 // No message handlers XWn VgY s  
 //}}AFX_MSG_MAP y@1+I ~@  
END_MESSAGE_MAP() .nTwPrG  
lVd^ ^T*fh  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) W=lyIb{?^0  
: CDialog(CCaptureDlg::IDD, pParent) \1d (9jR  
{ ~Cbc<[}  
 //{{AFX_DATA_INIT(CCaptureDlg) a@8v^G  
  m_bControl = FALSE; $Y;U[_l#  
  m_bAlt = FALSE; >u>5{4  
  m_bShift = FALSE; -N6f1>}pE  
  m_Path = _T("c:\\"); {]*c29b>  
  m_Number = _T("0 picture captured."); >f^r^P  
  nCount=0; Fiv3 {.  
  bRegistered=FALSE; 3^IpE];+:u  
  bTray=FALSE; _> f`!PlB|  
 //}}AFX_DATA_INIT Mo y <@+  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 vGvf<ra;H  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); S O4u9V  
} @#<D ^"  
ZLc -RM  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~Uu4=  
{ ,%6P0#-  
 CDialog::DoDataExchange(pDX); &]g}u5J!=  
 //{{AFX_DATA_MAP(CCaptureDlg) Ut*`:]la  
  DDX_Control(pDX, IDC_KEY, m_Key); .rO]M:UY  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); .RE:;<|w  
  DDX_Check(pDX, IDC_ALT, m_bAlt); F7 5#*  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >c1!p]&V  
  DDX_Text(pDX, IDC_PATH, m_Path); NYt&@Z}]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ?TM ,Q  
 //}}AFX_DATA_MAP Ua<5U5  
} nR7d4)  
mkMq  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $}RJ,%~'x  
//{{AFX_MSG_MAP(CCaptureDlg) 2X.r%&!1M  
 ON_WM_SYSCOMMAND() 1G"z<v B  
 ON_WM_PAINT() YO#M/%^j  
 ON_WM_QUERYDRAGICON() Q8C_9r/:N>  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) \O}E7 -  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) nv GF2(;l  
 ON_BN_CLICKED(ID_CHANGE, OnChange) T,7Y7c/3V  
//}}AFX_MSG_MAP p s/A yjk  
END_MESSAGE_MAP() 3?[dE<  
5BWH-2HsB  
BOOL CCaptureDlg::OnInitDialog() ;l4[%xld  
{ Diy8gt  
 CDialog::OnInitDialog(); dpJ_r>NI  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0f~C#/[t7  
 ASSERT(IDM_ABOUTBOX < 0xF000); nePfu G]Q  
 CMenu* pSysMenu = GetSystemMenu(FALSE); _+p4Wvu~0  
 if (pSysMenu != NULL) .GV;+8HzS  
 { "*($cQ$v  
  CString strAboutMenu; ,">]`|?  
  strAboutMenu.LoadString(IDS_ABOUTBOX); QXL'^uO  
  if (!strAboutMenu.IsEmpty()) Hv!U| L  
  { (XeE2l2M  
   pSysMenu->AppendMenu(MF_SEPARATOR); kr+D,h01  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6tXq:  
  } x8wD0D  
 } ~s% Md  
 SetIcon(m_hIcon, TRUE); // Set big icon MTsM]o  
 SetIcon(m_hIcon, FALSE); // Set small icon Y ?S!8-z  
 m_Key.SetCurSel(0); 4y)P>c  
 RegisterHotkey(); K$>%e36Cc  
 CMenu* pMenu=GetSystemMenu(FALSE); &atuK*W>  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 4 K!JQ|9  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 3wOZ4<B  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 'L 8n-TyL  
 return TRUE; // return TRUE unless you set the focus to a control Xp >7iX!:  
} ;fsZ7k4]do  
d_CKP"TA  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) yXz*5W_0D  
{ ,#Iu 7di  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) g>Y|9Y  
 { @*OZx9  
  CAboutDlg dlgAbout; }M1`di4e  
  dlgAbout.DoModal(); 1HXjN~XF  
 } s1=X>'q  
 else O]lSWEe  
 { q ]M+/sl  
  CDialog::OnSysCommand(nID, lParam); W=vG$  
 } !6BW@GeF]  
} mk1bcK9  
xGu r  
void CCaptureDlg::OnPaint() Qc gRAo+u  
{ !;0U,!WI  
 if (IsIconic()) ugo.@   
 { }YOL"<,:o  
  CPaintDC dc(this); // device context for painting =H8 xSJLh  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); z5*=MlZ)R.  
  // Center icon in client rectangle )s9',4$eK<  
  int cxIcon = GetSystemMetrics(SM_CXICON); aS}1Q?cU  
  int cyIcon = GetSystemMetrics(SM_CYICON); =TP( UJ  
  CRect rect; ^Cv^yTj;&  
  GetClientRect(&rect); 3K@@D B6  
  int x = (rect.Width() - cxIcon + 1) / 2; J!ntXF  
  int y = (rect.Height() - cyIcon + 1) / 2; mfny4R1_  
  // Draw the icon ,&HR(jTo  
  dc.DrawIcon(x, y, m_hIcon); +fKtG]$  
 } /$"[k2 N  
 else }]UB;id'  
 {  qW_u  
  CDialog::OnPaint(); W YW|P2*  
 } c~ <1':  
} ?@6/Alk  
6 fz}  
HCURSOR CCaptureDlg::OnQueryDragIcon() jy2IZ o  
{ ftk%EYT;  
 return (HCURSOR) m_hIcon; RE3Z%;'  
} iP3Z  
 6qo^2  
void CCaptureDlg::OnCancel() 5wC* ?>/  
{ m+$ @'TbP  
 if(bTray) ?v}Bd!'+P  
  DeleteIcon(); Vy G4(X va  
  CDialog::OnCancel(); \nrP$  
} aaWJ* >rJ  
M~6@20$oW  
void CCaptureDlg::OnAbout() Zszs1{t  
{ o=fgin/E\  
 CAboutDlg dlg; X7*`  
 dlg.DoModal(); J?:[$C5  
} 7q9gngT1LA  
x;BbTBc>  
void CCaptureDlg::OnBrowse() mjnUs-`W|  
{ pF=g||gS  
 CString str; T9y;OG  
 BROWSEINFO bi; %NHYW\sKX  
 char name[MAX_PATH]; J_#R 87  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); WN a0,  
 bi.hwndOwner=GetSafeHwnd(); 6DSH`-;  
 bi.pszDisplayName=name; S9Y[4*//  
 bi.lpszTitle="Select folder"; q(z7~:+qNr  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; vrl[BPI  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); wod/&!)]A  
 if(idl==NULL) 17UK1Jx,  
  return; %I4zQiJ%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !DjT<dxf  
 str.ReleaseBuffer(); CVKnTEs  
 m_Path=str; Fq,N  
 if(str.GetAt(str.GetLength()-1)!='\\') Bmr<O !  
  m_Path+="\\"; ]gd/}m)1  
 UpdateData(FALSE); '?/&n8J\  
} nTnRGf\T  
}B!cv{{  
void CCaptureDlg::SaveBmp() =q CF%~  
{ whkJpK(  
 CDC dc; 'wQy]zm$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 0g(6r-2)7  
 CBitmap bm; {gkwOMW  
 int Width=GetSystemMetrics(SM_CXSCREEN); WVL#s?=g  
 int Height=GetSystemMetrics(SM_CYSCREEN); !;}2F-  
 bm.CreateCompatibleBitmap(&dc,Width,Height); =Lw3 \5l  
 CDC tdc; 71iRG*O  
 tdc.CreateCompatibleDC(&dc); N=ifIVc  
 CBitmap*pOld=tdc.SelectObject(&bm); ~w.2 -D  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :I/  
 tdc.SelectObject(pOld); E[S':Q  
 BITMAP btm; U )Zt-og  
 bm.GetBitmap(&btm); &:vsc Ol  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; V<0$xV1b|=  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 1mUTtYU  
 BITMAPINFOHEADER bih; G1_Nd2w  
 bih.biBitCount=btm.bmBitsPixel; 0$Ff#8  
 bih.biClrImportant=0; G' Hh{_:  
 bih.biClrUsed=0; {[3YJkrM  
 bih.biCompression=0; Mvof%I  
 bih.biHeight=btm.bmHeight; r{"uv=,`  
 bih.biPlanes=1; xii$e  
 bih.biSize=sizeof(BITMAPINFOHEADER); &:8T$U V  
 bih.biSizeImage=size; u5E/m  
 bih.biWidth=btm.bmWidth; (v;A'BjN  
 bih.biXPelsPerMeter=0; (t74a E pi  
 bih.biYPelsPerMeter=0; zz3 r<?#5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Qp69Sk@H{  
 static int filecount=0; z6Z='=pT  
 CString name; h6FgS9H  
 name.Format("pict%04d.bmp",filecount++); cdp{W  
 name=m_Path+name; u%aFb*  
 BITMAPFILEHEADER bfh; |uQ[W17^N  
 bfh.bfReserved1=bfh.bfReserved2=0; uHrb:X!q  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 00qZw?%K  
 bfh.bfSize=54+size; Ld~4nc$H8  
 bfh.bfOffBits=54; |8;? *s`H  
 CFile bf; `(T!>QVW+g  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .nPL2zO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2lJZw@  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Qg{WMlyOP  
  bf.WriteHuge(lpData,size); @YNGxg~*g  
  bf.Close(); UC#"=Xd 4  
  nCount++; ~9i qD  
 } ]c,l5u}A$  
 GlobalFreePtr(lpData); TPqvp|~2  
 if(nCount==1) .' IeHh  
  m_Number.Format("%d picture captured.",nCount); %xh?!s|G(  
 else KE#$+,?  
  m_Number.Format("%d pictures captured.",nCount); >gGil|I  
  UpdateData(FALSE); %O Fj  
} 1!s!wQgS  
N=<=dp(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5])8qb/F  
{ Wa{%0inZ  
 if(pMsg -> message == WM_KEYDOWN) t}c v2S  
 { U>1b9G"_  
  if(pMsg -> wParam == VK_ESCAPE) cyHhy_~R  
   return TRUE; GM77Z.Y  
  if(pMsg -> wParam == VK_RETURN) -UTV:^  
   return TRUE; 8LeK wb  
 } ktWZBQY  
 return CDialog::PreTranslateMessage(pMsg); Yim#Pq&_  
} W`5a:"Vg  
J[MVE4&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *H?t;,\  
{ y78z>(jV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ wU.'_SBfB  
  SaveBmp(); BZ}`4W'  
  return FALSE; :`;(p{  
} ^}tL nF  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ r /^'Xj'(  
 CMenu pop; R^|!^[WE  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); (A2U~j?Ry}  
 CMenu*pMenu=pop.GetSubMenu(0); .dt#2a_5q  
 pMenu->SetDefaultItem(ID_EXITICON); ^b:Xo"q#H  
 CPoint pt; +fkP+RVY  
 GetCursorPos(&pt); .byc;9M%  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); SC]6F*  
 if(id==ID_EXITICON) .$UTH@;7  
  DeleteIcon(); 0}6QO  
 else if(id==ID_EXIT) aQxe)  
  OnCancel(); BU'Ki \  
 return FALSE; iY}QgB< M  
} X1O65DMr`g  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n}+wd9J*!2  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)  .fbYB,0w  
 AddIcon(); Q Xsfp  
 return res; JXlTN[O  
} s87 a %  
rA[nUJ,  
void CCaptureDlg::AddIcon() Io2,% !D  
{ *h>OW  
 NOTIFYICONDATA data; t`) 'LT  
 data.cbSize=sizeof(NOTIFYICONDATA); yY'gx|\  
 CString tip; l.sm~/  
 tip.LoadString(IDS_ICONTIP); $U\!q@'$  
 data.hIcon=GetIcon(0); *X%?3"WH8  
 data.hWnd=GetSafeHwnd(); )hePN4edj  
 strcpy(data.szTip,tip); )J{.Cx<E  
 data.uCallbackMessage=IDM_SHELL; ZCj>MA  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1hF2eNh  
 data.uID=98; Dm&lSWW`/  
 Shell_NotifyIcon(NIM_ADD,&data); -$xKv4  
 ShowWindow(SW_HIDE); hgF21Oj9  
 bTray=TRUE; |G[{{qZM5  
} pZyb  
1!K !oY  
void CCaptureDlg::DeleteIcon() UDhwnGTq(l  
{ Ej-=y2j{g  
 NOTIFYICONDATA data; n P0Ziu'{  
 data.cbSize=sizeof(NOTIFYICONDATA); kxcgOjrmI  
 data.hWnd=GetSafeHwnd(); L&+% Wd~  
 data.uID=98; U@1#!ZZ6  
 Shell_NotifyIcon(NIM_DELETE,&data); at_dmU2[7  
 ShowWindow(SW_SHOW); WiPM <'  
 SetForegroundWindow(); J R 8 Z6  
 ShowWindow(SW_SHOWNORMAL); ZE5-i@1  
 bTray=FALSE; .Y=Z!Q  
} 7vB9K_wCI  
^(E"3 c  
void CCaptureDlg::OnChange() ,Y78Q  
{ jM|YW*zNZ  
 RegisterHotkey(); 7J #g1  
} JKEXYE  
HYa$EE2  
BOOL CCaptureDlg::RegisterHotkey() %[+a[/  
{ ]%vGC^  
 UpdateData(); Z<$E.##  
 UCHAR mask=0; 6KBzlj0T+  
 UCHAR key=0; yg-L^`t+B5  
 if(m_bControl) vTe$77n  
  mask|=4; +=,4@I%  
 if(m_bAlt) \ N-| iq  
  mask|=2; hi4h0\L!}  
 if(m_bShift) q.u[g0h;  
  mask|=1; b7>,-O  
  key=Key_Table[m_Key.GetCurSel()]; EL2hD$  
 if(bRegistered){ 5<:VJC<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Sm*Jysy`  
  bRegistered=FALSE; $9 &Q.Kpq>  
 } 3_R   
 cMask=mask; =0!\F~  
 cKey=key; priT 7!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); rhzv^t  
 return bRegistered; Npf7p  
} ib""Fv7{  
Jfixm=.6  
  四、小结 g~$GE},,  
GWA!Ab'<U  
  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
温馨提示:欢迎交流讨论,请勿纯表情、纯引用!
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八