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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: 0J_x*k6  
  Oa7W&wi  
  一、实现方法 -Rf|p(SJ,E  
adxJA}K}  
  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: bEy%S "\<  
<n#JOjHV  
#pragma data_seg("shareddata") ) wGC=,  
HHOOK hHook =NULL; //钩子句柄 -&HN h\  
UINT nHookCount =0; //挂接的程序数目 8C YJR/  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4o|~KX8Qz  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @Xh 4ZMyEx  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey n =v %}@f2  
static int KeyCount =0; ?+TD2~rD(  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 {1qEN_ERx  
#pragma data_seg() YV2^eGr.  
BkC(9[Ei  
  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。 jb*#!m.l  
m4%m0"Z  
  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: n XQg(!  
i?a]v 5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR R `'@$"  
cKey,UCHAR cMask) Rc6Rk!^  
{ tG{Vn+~/  
 BOOL bAdded=FALSE; 36j.is  
 for(int index=0;index<MAX_KEY;index++){ QzS{2Y[OQ  
  if(hCallWnd[index]==0){ P]y5E9 k  
   hCallWnd[index]=hWnd; V*/))n?  
   HotKey[index]=cKey; P"~ B2__*  
   HotKeyMask[index]=cMask; :b ;5O3:B  
   bAdded=TRUE; QKF2_Acc   
   KeyCount++; CBvBBt*  
   break; fW\u*dMMZE  
  } 5Q^~Z},  
 } Q647a}  
 return bAdded; ck^Z,AKL+  
} 6Z'zB&hM}  
//删除热键 me9RnPe:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )WzCUYE1/  
{ sG}9l1  
 BOOL bRemoved=FALSE; O_:Q#  
 for(int index=0;index<MAX_KEY;index++){ aNwDMd^+  
  if(hCallWnd[index]==hWnd){ $iB(N ZV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ q&wMp{  
    hCallWnd[index]=NULL; `SU;TN0  
    HotKey[index]=0; AHLDURv  
    HotKeyMask[index]=0; {vU '>pp  
    bRemoved=TRUE; "5e]-u'  
    KeyCount--; 1ri#hm0x\  
    break; &iSQ2a!l8b  
   } Wd%j;glG  
  } h&Sl8$jVp  
 } kz??""G7/  
 return bRemoved; n%O`K{86  
} ^X?[zc GE  
L Y M`  
qa Q  
  DLL中的钩子函数如下: ]:f1r8<3p  
Z@*Z@]FC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R52!pB0[  
{ Eod2vr =Q  
 BOOL bProcessed=FALSE; a:8@:d1T K  
 if(HC_ACTION==nCode) 6s uc0  
 { 1"e=Zqn$)  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ~7=,)Q  
   switch(wParam) x0 #+yP  
   {  o]FQ)WRB  
    case VK_MENU: EXzY4D ^  
     MaskBits&=~ALTBIT; j^k{~]+_^]  
     break; EYQ!ELuF  
    case VK_CONTROL: mEqV&M1;7l  
     MaskBits&=~CTRLBIT; E6G^?k~q  
     break; 0|U<T#t8?  
    case VK_SHIFT: :DZiDJ@  
     MaskBits&=~SHIFTBIT; 6?Wsg`9  
     break; 68d@By  
    default: //judge the key and send message kj[[78  
     break; U]P;X~$!  
   } ZzE&?  
   for(int index=0;index<MAX_KEY;index++){ oNdO@i%.q4  
    if(hCallWnd[index]==NULL) I/(`<s p  
     continue; 81KtK[?b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZWFH5#=  
    { J d`NS3;*p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Z86[sQBg  
     bProcessed=TRUE; n1LS*-@  
    } u|Ai<2b$  
   } ql zL<  
  } 9hq7:  
  else if((lParam&0xc000ffff)==1){ //有键按下 +I')>6  
   switch(wParam) U_J|{*4S.!  
   { HgMDw/D(  
    case VK_MENU: VP"L _Um  
     MaskBits|=ALTBIT; 7j]@3D9[:p  
     break; ^=@%@mR/[C  
    case VK_CONTROL: U9 If%0P  
     MaskBits|=CTRLBIT; 9f V57  
     break; N0XGW_f  
    case VK_SHIFT: (2{1m#o  
     MaskBits|=SHIFTBIT; >!wwXhH(  
     break; $L&*0$[]Q  
    default: //judge the key and send message [m"X*Z F  
     break; .c',?[S/vH  
   } }skXh_Vu4  
   for(int index=0;index<MAX_KEY;index++){ leiza?[  
    if(hCallWnd[index]==NULL) ~p8!Kb6  
     continue; O 8fh'6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B>'\g O\2  
    { C2VZE~U+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); i ^W\YLE  
     bProcessed=TRUE; .d*vfE$  
    } g,1\Gj%y  
   } _7;#0B  
  } 2vur _`c V  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 oi!E v_h  
   for(int index=0;index<MAX_KEY;index++){ vbWX`skU  
    if(hCallWnd[index]==NULL) ;^xku%u  
     continue; =EG[_i{r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *s/F4?*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); d2(n3Xf  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 xo*a9H?@  
   } *L!R4;ubE  
  } J0x)m2  
 } L h0<A%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r9QNE>UG  
} nqV7Db~  
's9)\LS>p  
  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: sPhh#VCw{  
+F@9AO>LF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $DQMN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  g6~uf4;  
%@IR7v~  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: c~Ha68  
4[(P>`Unx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Vw,dHIe(3  
{ E0*81PS  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *AJW8tIP  
 { ?>w%Lg{L}  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 >yaz  
  SaveBmp(); "{&!fD~w  
  return FALSE; zi5;>Iv0}  
 } mO\6B7V!  
 …… //其它处理及默认处理 avT>0b:  
} U_!6pqFc  
Z)ObFJMG5  
N#UyAm<9  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 S |B7HS5  
6g!t1%Kb  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 #]Cr zLe  
^v`|0z\  
  二、编程步骤 o|UZdGu  
Bkcs4 x  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 8 /\rmf\  
b,!h[  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; T+gqu &9R  
w+JDu_9+A]  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; {? 6]_J  
.-o$ IQsS  
  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; :_vf1>[  
g{i( 4DHm(  
  5、 添加代码,编译运行程序。 5` Q#2  
}96^OQPE  
三、程序代码 z,^baU  
/|>z7#?m^  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  ]@<O!fS  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Bq\%]2;eo{  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ? 1_*ct=g9  
#if _MSC_VER > 1000 Wx^L~[l  
#pragma once n0cqM}P@;!  
#endif // _MSC_VER > 1000 O6m}#?Ai/@  
#ifndef __AFXWIN_H__ C^ uXJ~8  
#error include 'stdafx.h' before including this file for PCH pE`BB{[@  
#endif 05w_/l+  
#include "resource.h" // main symbols p^^<BjkQ  
class CHookApp : public CWinApp -()CgtSR  
{ AJj6@hi2P  
 public: z;Kyg}  
  CHookApp(); uv Z!3UH.  
  // Overrides _RAPXU~ 6-  
  // ClassWizard generated virtual function overrides b&0q%tCK  
  //{{AFX_VIRTUAL(CHookApp) 9V\5`QXu  
 public: _TkiI.'  
  virtual BOOL InitInstance(); 8?ZK^+]y  
  virtual int ExitInstance(); 1YQ|KJ*K  
  //}}AFX_VIRTUAL >8QLo8)3C  
  //{{AFX_MSG(CHookApp) {6RT&w  
  // NOTE - the ClassWizard will add and remove member functions here. l.FkX  
  // DO NOT EDIT what you see in these blocks of generated code ! $_NVy>\&  
  //}}AFX_MSG tLLP2^_&  
  DECLARE_MESSAGE_MAP() pWeKN`  
}; _O)~<Sk-*z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); QKe=/;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HD$W\P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2x t 8F  
BOOL InitHotkey(); zs WYV n]  
BOOL UnInit(); \|Us/_h  
#endif CGPPo;RjK  
Z?dz@d%C  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^ @sg{_.~l  
#include "stdafx.h" =%p0r z|b  
#include "hook.h" s:6H^DQ"C  
#include <windowsx.h> <&Y7Q[  
#ifdef _DEBUG 8I`>tY  
#define new DEBUG_NEW   Lxs  
#undef THIS_FILE :6%wVy5  
static char THIS_FILE[] = __FILE__; <Knl6$B  
#endif )%gi gQZ+  
#define MAX_KEY 100 /u5MAl.<[  
#define CTRLBIT 0x04 K oo%mr   
#define ALTBIT 0x02 `cCsJm$V"  
#define SHIFTBIT 0x01 N<9C V!_  
#pragma data_seg("shareddata") R9^Vk*`gFU  
HHOOK hHook =NULL; RYy_Ppn96f  
UINT nHookCount =0; e'p'{]r<w  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey l7nc8K  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 'tklz*  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey `gx_+m^  
static int KeyCount =0; H W)> `  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift r 1nl!  
#pragma data_seg() [a`89'"z  
HINSTANCE hins; 1o V\QK&  
void VerifyWindow(); 7"FsW3an  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) x}{/) ?vC  
//{{AFX_MSG_MAP(CHookApp) X=8y$Yy  
// NOTE - the ClassWizard will add and remove mapping macros here. }f/ 1  
// DO NOT EDIT what you see in these blocks of generated code! 5PqL#Eu`!  
//}}AFX_MSG_MAP VMZ\9IwI  
END_MESSAGE_MAP() ~#C7G\R  
"sdzm%  
CHookApp::CHookApp() Ho2#'lSKM  
{ 2h%/exeS;  
 // TODO: add construction code here, 1pg&?L.MA  
 // Place all significant initialization in InitInstance pxDkf|*   
} Et}S*!IS  
Se{}OG)  
CHookApp theApp; `O5w M\Z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [RoOc)u  
{ I x kL]  
 BOOL bProcessed=FALSE; uD4on}  
 if(HC_ACTION==nCode) p D-k<8|  
 { (_ HwU/  
  if((lParam&0xc0000000)==0xc0000000){// Key up J>y}kzCz  
   switch(wParam) 8KiG(6*Q  
   {  LhKaqR{  
    case VK_MENU: 5bKM}? =L  
     MaskBits&=~ALTBIT; $SQ UN*/>  
     break; [3"k :  
    case VK_CONTROL:  ltK\ )L  
     MaskBits&=~CTRLBIT; >k }ea5+  
     break; B<zoa=  
    case VK_SHIFT: >g+yw1nC  
     MaskBits&=~SHIFTBIT; ~4fUaMT  
     break; P{-j ^'y  
    default: //judge the key and send message 4YX/=  
     break; /H3z~PBa  
   } 1DLAfsLlj  
   for(int index=0;index<MAX_KEY;index++){ 6V-u<FJ  
    if(hCallWnd[index]==NULL) *t=8^q(K[  
     continue; LDc?/ Z1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~.7/o0'+  
    { )31{.c/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KPHtD4  
     bProcessed=TRUE; K2|2Ks_CS  
    } @cRR  
   } lY -2e>  
  } D`d*bNR  
  else if((lParam&0xc000ffff)==1){ //Key down A#k(0e!O  
   switch(wParam) !?)ky `S3  
   { Di) %vU  
    case VK_MENU: 3b{ 7Z 2  
     MaskBits|=ALTBIT; /Z^"[Ke  
     break; B8.a#@R  
    case VK_CONTROL: v]{F.N  
     MaskBits|=CTRLBIT; ( f]@lNmx  
     break; Jui:Ms  
    case VK_SHIFT: QiKci%=SX  
     MaskBits|=SHIFTBIT; J'}G~rB<<  
     break; ~?#>QN\\c  
    default: //judge the key and send message F \0>/  
     break; n#$sLXVy  
   } 5ir Ffr  
   for(int index=0;index<MAX_KEY;index++) OEi u,Y|@l  
   { >f$N G  
    if(hCallWnd[index]==NULL) zbY2gq@?  
     continue; 7XzhKA6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p+7G  
    { 3']a1\sy^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); nwS @r  
     bProcessed=TRUE; $/p0DY  
    } kx{LY`pY  
   } 9[2qgw\D  
  } QQI,$HId  
  if(!bProcessed){ ;*u"hIl1/  
   for(int index=0;index<MAX_KEY;index++){ $|"Y|3&X  
    if(hCallWnd[index]==NULL) ZNDn! Sj  
     continue; +}VaQ8ti4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) P aD6||1F  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \rj>T6  
   } d6^:lbj  
  } Q HU|aC{r  
 } [g<Y,0,J  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); MpK3+4UMa  
} ES}V\k*}  
\qf0=CPw8  
BOOL InitHotkey() kz_gR;"(Z  
{ O:E0htdWr  
 if(hHook!=NULL){ ZWmS6?L.  
  nHookCount++; jlxY|;gZ-0  
  return TRUE; - f?8O6e  
 } XQ3"+M_KG  
 else Iip%er%b  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); dl]pdg<  
  if(hHook!=NULL) Y5{KtW  
   nHookCount++; &x9>8~   
  return (hHook!=NULL); fV#,<JG  
} .}9Lj  
BOOL UnInit() ^r=Wj@`  
{ @>fsg-|  
 if(nHookCount>1){ %1oB!+tv  
  nHookCount--; u4#YZOiY)A  
  return TRUE; hv0bs8h  
 } oyT`AYa  
 BOOL unhooked = UnhookWindowsHookEx(hHook); dy>5LzqK3  
 if(unhooked==TRUE){ &t~NR$@  
  nHookCount=0; S;0z%$y  
  hHook=NULL; **V8a-@  
 } n!dXjInV  
 return unhooked; yJK:4af;.  
} R 7h^ @  
[I?[N.v  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G! Y l0Zr  
{ ,&~-Sq) ~  
 BOOL bAdded=FALSE; Ij>G7Q*d  
 for(int index=0;index<MAX_KEY;index++){ A` ~R\j  
  if(hCallWnd[index]==0){ i/ .#`  
   hCallWnd[index]=hWnd; =,b6yV+$D  
   HotKey[index]=cKey; .C\2f+(U  
   HotKeyMask[index]=cMask; )IVk4|  
   bAdded=TRUE; 2YDD`:R  
   KeyCount++; x2,;ar\D  
   break; h2-v.Tjf  
  } }_Ci3|G>%D  
 } S zNZY&8 f  
 return bAdded; Bs `mzA54  
} ?edf$-"z/  
C$0rl74Wi  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2qdc$I&$  
{ sYhHh$mwA  
 BOOL bRemoved=FALSE; GbC@ |  
 for(int index=0;index<MAX_KEY;index++){ BG6.,'~7o  
  if(hCallWnd[index]==hWnd){ -5oYGLS$y3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ c,^W/:CQAB  
    hCallWnd[index]=NULL; s~QIs  
    HotKey[index]=0; 3$?nzKTW\  
    HotKeyMask[index]=0; 0bpGPG's&  
    bRemoved=TRUE; #<~oR5ddlb  
    KeyCount--; L +mE&  
    break; J&Db-  
   } H&8~"h6n  
  } 3:O|p[2)L  
 } 25f[s.pv8  
 return bRemoved; R$ !]z(  
} q*Oj5;  
?S;z!) H)P  
void VerifyWindow() <:!E'WT#f  
{ 2 OV$M~  
 for(int i=0;i<MAX_KEY;i++){ l{*m-u5&;  
  if(hCallWnd!=NULL){ tPa( H;  
   if(!IsWindow(hCallWnd)){ ScjeAC)  
    hCallWnd=NULL; ow  
    HotKey=0; Zor!hc0<  
    HotKeyMask=0; ^*YoNd_kpN  
    KeyCount--; %K+hG=3O  
   } CIui9XNU  
  } u -)ED  
 } QLU <%w:B  
} NT2XG& $W>  
kh@O_Q`j  
BOOL CHookApp::InitInstance() s2( 7z9jR  
{ ALn_ifNh  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !rs }83w!  
 hins=AfxGetInstanceHandle(); ]cv/dY#  
 InitHotkey(); =jKu=!QPq  
 return CWinApp::InitInstance(); 15VvZ![$V  
} _u""v   
,na}' A@a`  
int CHookApp::ExitInstance() yN)(MmX'1  
{ "@5qjLz]  
 VerifyWindow(); (-Q~@Q1  
 UnInit(); ^I|i9MH  
 return CWinApp::ExitInstance(); W[k rq_c-  
} f[vm]1#  
Y}xM&%  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 7NT0]j(w-  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \[qxOZ{  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %y\5L#T!>  
#if _MSC_VER > 1000 [MQ* =*  
#pragma once kOdA8X RY  
#endif // _MSC_VER > 1000 "N ">RjJ"  
TV0sxod6  
class CCaptureDlg : public CDialog JhjH_)  
{ b)x0;8<  
 // Construction iITMBS`}  
 public: *P5\T4!+d  
  BOOL bTray; O8A(OfX  
  BOOL bRegistered; 8KN 3|)  
  BOOL RegisterHotkey(); QgKR=GR6  
  UCHAR cKey; qO38vY){  
  UCHAR cMask; BQ<\[H;  
  void DeleteIcon(); VxS3lR=  
  void AddIcon(); l]~9BPsR  
  UINT nCount; n!AW9]  
  void SaveBmp(); p^}`^>OL  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor $a8,C\m e?  
  // Dialog Data 3M(*q4A$"  
  //{{AFX_DATA(CCaptureDlg) YD@Z}NE v"  
  enum { IDD = IDD_CAPTURE_DIALOG }; F Z RnIg  
  CComboBox m_Key; u  Fw1%  
  BOOL m_bControl; XZ{rKf2  
  BOOL m_bAlt; CJh,-w{wJ"  
  BOOL m_bShift; /}2Y-GOU  
  CString m_Path; q.<)0nk  
  CString m_Number; /P-#y@I  
  //}}AFX_DATA 9D &vxKE  
  // ClassWizard generated virtual function overrides *5 9|  
  //{{AFX_VIRTUAL(CCaptureDlg) .I EHjy\+  
 public: ji>LBbnHdE  
  virtual BOOL PreTranslateMessage(MSG* pMsg); rW|%eT*/'A  
 protected: {chZ&8)f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d>mT+{3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >Ut: -}CS  
  //}}AFX_VIRTUAL j!NXNuy:  
  // Implementation  @;KYvDY  
 protected: 3bXfR,U  
  HICON m_hIcon; 7.Z-  
  // Generated message map functions  DAiS|x  
  //{{AFX_MSG(CCaptureDlg) <,0/BMz  
  virtual BOOL OnInitDialog(); v&(=^A\eN  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >&:}L%  
  afx_msg void OnPaint(); L1I1SFG  
  afx_msg HCURSOR OnQueryDragIcon(); YlUh|sK7m  
  virtual void OnCancel(); 'K02T:\iZ  
  afx_msg void OnAbout();  ^|zag  
  afx_msg void OnBrowse(); qy.$5-e:[9  
  afx_msg void OnChange(); UCjx   
 //}}AFX_MSG JIw?]xa*  
 DECLARE_MESSAGE_MAP() iLJ@oM;2  
}; yGNpx3H  
#endif ^n<YO=|u  
U^|T{g+O  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file o~e_M-  
#include "stdafx.h" ]T|$nwQ  
#include "Capture.h" fMUh\u3  
#include "CaptureDlg.h" u=qaz7E  
#include <windowsx.h> U?Dr0wD;[  
#pragma comment(lib,"hook.lib") /O.Ql ,6[  
#ifdef _DEBUG rQlQ^W$=?  
#define new DEBUG_NEW +TA~RC d  
#undef THIS_FILE 7P(jMalq  
static char THIS_FILE[] = __FILE__; v4Rci^8  
#endif t_xK?``  
#define IDM_SHELL WM_USER+1 M*qE)dZjS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n*ShYsc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3) d }3w {  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; N?-ZvE\C  
class CAboutDlg : public CDialog n{<}<SVY  
{ 5,oLl {S'  
 public: A?lR[`'u\  
  CAboutDlg(); 3M+rFB}tS  
  // Dialog Data &L5 )v\z  
  //{{AFX_DATA(CAboutDlg) !wQ?+ :6  
  enum { IDD = IDD_ABOUTBOX }; Al6%RFt  
  //}}AFX_DATA 3u[8;1}7Q  
  // ClassWizard generated virtual function overrides  !QvmzuK  
  //{{AFX_VIRTUAL(CAboutDlg) TfkGkVR  
 protected: P(Rl/eyRM  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J^CAQfcx  
  //}}AFX_VIRTUAL eR>8V8@  
  // Implementation b/qK/O8J  
 protected: vdvnwzp!l  
  //{{AFX_MSG(CAboutDlg) s@iY'11  
  //}}AFX_MSG l1lYb;C  
  DECLARE_MESSAGE_MAP() ; U7P{e05  
}; Cw(ypu  
D@9 +yu=S  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %i/|}K  
{ Q:Pp'[ RK  
 //{{AFX_DATA_INIT(CAboutDlg) *yw!Y{e!9  
 //}}AFX_DATA_INIT U ^GVz%\  
} z8'zH>  
`pCy:J?d>l  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) LTzdg >\oJ  
{ @v@F%JCZ  
 CDialog::DoDataExchange(pDX); _eq$C=3Ta  
 //{{AFX_DATA_MAP(CAboutDlg) #BcUE?K*N  
 //}}AFX_DATA_MAP C P&u  
} lEwQj[ k  
`:~Wu/Ogr  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) GRYw_}Aa  
 //{{AFX_MSG_MAP(CAboutDlg) w{dRf!b69  
 // No message handlers M&hNkJK*G  
 //}}AFX_MSG_MAP 'R'hRMD9o  
END_MESSAGE_MAP() '" %0UflJS  
f42F@M(:  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~7KH/%Z-  
: CDialog(CCaptureDlg::IDD, pParent) wG7>2*(  
{ =v::N\&  
 //{{AFX_DATA_INIT(CCaptureDlg) .TdFI"Yn  
  m_bControl = FALSE; ezL1,GT  
  m_bAlt = FALSE; !*~QB4\2b  
  m_bShift = FALSE; hx;kNcPbI  
  m_Path = _T("c:\\"); XC~"T6F  
  m_Number = _T("0 picture captured."); 1aIGC9xQ`  
  nCount=0; 4 FZR }e\  
  bRegistered=FALSE; Q>+rjN;  
  bTray=FALSE; k'|yUJ,  
 //}}AFX_DATA_INIT +x`pWH]2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 =oh%-Sh:  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); XKZsX1=@R  
} ,q#SAZ/N  
!',%kvJI  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) U`EOun ,  
{ dL+yd0 b*  
 CDialog::DoDataExchange(pDX); ZAy/u@qt  
 //{{AFX_DATA_MAP(CCaptureDlg) \db=]L=|  
  DDX_Control(pDX, IDC_KEY, m_Key); CC"a2Hu/  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); M[z1B!rT  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .On qj^v  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); y7!&  
  DDX_Text(pDX, IDC_PATH, m_Path); z&9MkbH1  
  DDX_Text(pDX, IDC_NUMBER, m_Number); O.QR1  
 //}}AFX_DATA_MAP `W@jo~ y<  
} L-}Uj^yF  
pGR3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3b0|7@_E  
//{{AFX_MSG_MAP(CCaptureDlg) ohx$;j  
 ON_WM_SYSCOMMAND() |4pl}:g/Z  
 ON_WM_PAINT() ?qSwV.l]d  
 ON_WM_QUERYDRAGICON() fUY05OMZ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) /%,aX [  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) s:xJ }Ll  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 6S n&; ap  
//}}AFX_MSG_MAP tKe-Dk9  
END_MESSAGE_MAP() 9)S3{i6w  
zb4@U=?w}  
BOOL CCaptureDlg::OnInitDialog() +2eri_p  
{ 9Xa.%vw>  
 CDialog::OnInitDialog(); . 70=xH  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |XG&[TI- "  
 ASSERT(IDM_ABOUTBOX < 0xF000); -V~Fj~b#  
 CMenu* pSysMenu = GetSystemMenu(FALSE); _6h.<BR  
 if (pSysMenu != NULL) Hik=(pTu>  
 { oLX[!0M^  
  CString strAboutMenu; `@1e{ ?$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); KGc.YUoE  
  if (!strAboutMenu.IsEmpty()) J %A=  
  { ]9w8[T:O  
   pSysMenu->AppendMenu(MF_SEPARATOR); %{rb,6  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); zGz}.-F  
  } wN%lc3[/z2  
 } (G./P@/[  
 SetIcon(m_hIcon, TRUE); // Set big icon 0L32sF y  
 SetIcon(m_hIcon, FALSE); // Set small icon #T>?g5I  
 m_Key.SetCurSel(0); u tkdL4G}'  
 RegisterHotkey(); aj1,h)P  
 CMenu* pMenu=GetSystemMenu(FALSE); dr&G>  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); DMDtry?1:  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^J hs/HV  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -?1R l:rM  
 return TRUE; // return TRUE unless you set the focus to a control b3[!1i  
} : KFK2yD  
L?|}!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) U<sGj~"#  
{ 1fIx@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) O9?.J,,mVh  
 { (=WYi~2v  
  CAboutDlg dlgAbout; F|m &n&  
  dlgAbout.DoModal(); YCb|eS^u  
 } =Gzs+6A8  
 else S~fP$L5  
 { [tt{wl"E  
  CDialog::OnSysCommand(nID, lParam); m6K7D([f  
 } 2NjgLXP  
} a]5y CBm  
rf]z5;  
void CCaptureDlg::OnPaint() SYsO>`/ )  
{ WH39=)D%u  
 if (IsIconic()) i g7|kl  
 { E`qX|n  
  CPaintDC dc(this); // device context for painting 5+oY c-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8:S+*J[gSn  
  // Center icon in client rectangle {t! &x:  
  int cxIcon = GetSystemMetrics(SM_CXICON); V;CRs\aYf  
  int cyIcon = GetSystemMetrics(SM_CYICON); "mE/t  (  
  CRect rect; i!UT =  
  GetClientRect(&rect); E24}?t^|  
  int x = (rect.Width() - cxIcon + 1) / 2; - (((y)!  
  int y = (rect.Height() - cyIcon + 1) / 2; ~Yl.(R  
  // Draw the icon TTa3DbFp%  
  dc.DrawIcon(x, y, m_hIcon);  Rm)hgmZ  
 } /!t:MK;  
 else DxN\ H"  
 { cc`u{F9  
  CDialog::OnPaint(); /&47qU4PJ  
 } wVI_SQ<8V  
} _s0)Dl6K  
( [a$Z2m  
HCURSOR CCaptureDlg::OnQueryDragIcon() Aep](je  
{ OMo/a%`  
 return (HCURSOR) m_hIcon; jP}Ry=V/  
} +0*\q  
I!9>"s12  
void CCaptureDlg::OnCancel() r|uR!=*|?  
{ N>a~k}pPH  
 if(bTray) ^q& Rl\  
  DeleteIcon(); >)*d/^  
  CDialog::OnCancel(); >+;} "J  
} ~rjK*_3/  
[X]hb7-&  
void CCaptureDlg::OnAbout() wxJ"{(;  
{ [hH>BEtm  
 CAboutDlg dlg; %1#|>^  
 dlg.DoModal(); yk4py0xVl  
} >f^kp8`3{Y  
) Kl@dj  
void CCaptureDlg::OnBrowse() .L1[Rv3  
{ p-(V2SP/)t  
 CString str; %qeNC\6N  
 BROWSEINFO bi; o2$A2L9P  
 char name[MAX_PATH]; OKau3T]  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y^d#8^cP  
 bi.hwndOwner=GetSafeHwnd(); 1TfFWlf[B  
 bi.pszDisplayName=name; VFnxj52<  
 bi.lpszTitle="Select folder"; C{t}q*fG 5  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; {hf_Xro&  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); m*)jnd XY  
 if(idl==NULL) JS\]|~Gd  
  return; @J6r;4|&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); z.)*/HGJm  
 str.ReleaseBuffer(); @Q nKaZ8jW  
 m_Path=str; }LX!dDuwA  
 if(str.GetAt(str.GetLength()-1)!='\\') 99'c\[fd'  
  m_Path+="\\"; [K4 k7$  
 UpdateData(FALSE); IS[q'Cv*  
} "B"ql-K  
g%^/^<ei  
void CCaptureDlg::SaveBmp() NgsEEPu?  
{ ,SdxIhL  
 CDC dc; [GK## z'5  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,d.5K*?aI  
 CBitmap bm; `{yI| Wf  
 int Width=GetSystemMetrics(SM_CXSCREEN); {`)o xzR  
 int Height=GetSystemMetrics(SM_CYSCREEN); L:@COy  
 bm.CreateCompatibleBitmap(&dc,Width,Height); f0%'4t  
 CDC tdc; ~@<o-|#  
 tdc.CreateCompatibleDC(&dc); wpQp1){%Q  
 CBitmap*pOld=tdc.SelectObject(&bm); ?=_w5D.3J  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); kDRxu!/  
 tdc.SelectObject(pOld); qyy .&+  
 BITMAP btm; {A ,w%  
 bm.GetBitmap(&btm); -cn`D2RP  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {H9g&pfv  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &io+*  
 BITMAPINFOHEADER bih;  '@.Lg0`  
 bih.biBitCount=btm.bmBitsPixel; m`xYd  
 bih.biClrImportant=0; "5N$u(: b  
 bih.biClrUsed=0; yF |28KJ  
 bih.biCompression=0; b rDyjh  
 bih.biHeight=btm.bmHeight; ^aJ]|*m  
 bih.biPlanes=1; =)iAU/*N  
 bih.biSize=sizeof(BITMAPINFOHEADER); E"/k"1@  
 bih.biSizeImage=size; ZtGk Md$  
 bih.biWidth=btm.bmWidth; B 'd@ms  
 bih.biXPelsPerMeter=0; bng/v  
 bih.biYPelsPerMeter=0; 4 s9^%K\8{  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Edcv>}PfE  
 static int filecount=0; |?f~T"|>  
 CString name; T(cpU,Q  
 name.Format("pict%04d.bmp",filecount++); %7\l+g,  
 name=m_Path+name; O\]{6+$fm!  
 BITMAPFILEHEADER bfh; ZN'B @E=p  
 bfh.bfReserved1=bfh.bfReserved2=0; # M3d=  
 bfh.bfType=((WORD)('M'<< 8)|'B'); KNP^k$=)3c  
 bfh.bfSize=54+size; q/@r#  
 bfh.bfOffBits=54; H#nJWe_9A  
 CFile bf; T|(w-)mv  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ G(F=6L~;  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); G2>s#Y5(,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); C4d CaiX  
  bf.WriteHuge(lpData,size); G$/Qcr6W<  
  bf.Close(); Rf=-Q %  
  nCount++; fv* $=m  
 } p>T  
 GlobalFreePtr(lpData); |x _jpR  
 if(nCount==1) q!5`9u6  
  m_Number.Format("%d picture captured.",nCount); @K#}nKN'  
 else 6*|EB|%n  
  m_Number.Format("%d pictures captured.",nCount); ose)\rM'  
  UpdateData(FALSE); zY4y]k8D*  
} Fy6Lz.baB  
j&8G tE1b  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) H2+Ijn19E  
{ ?AI`,*^  
 if(pMsg -> message == WM_KEYDOWN) brqmi<*9"[  
 { pd.pY*B<[  
  if(pMsg -> wParam == VK_ESCAPE) tgeXX1Eq!  
   return TRUE; t""Y -M  
  if(pMsg -> wParam == VK_RETURN) Nh4&3"g|  
   return TRUE; ?c fFJl  
 } nx{X^oc8e  
 return CDialog::PreTranslateMessage(pMsg); rC/z8m3z  
} oHV!>K_D  
{p(6bsn_#]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) NVf_#p"h  
{ c47.,oTo  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?xQm_ 91X^  
  SaveBmp(); 9:E.Iy  
  return FALSE; 4a.8n!sys  
} LTb#1JC  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ iWe'|Br  
 CMenu pop; ue!4By8T  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); N{Pa&/V  
 CMenu*pMenu=pop.GetSubMenu(0); 7< ?Aou  
 pMenu->SetDefaultItem(ID_EXITICON); zrC1/%T  
 CPoint pt; $TAsb>W!(  
 GetCursorPos(&pt); /|v b)J  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); a72L%oJ   
 if(id==ID_EXITICON) m'ZxmsFo  
  DeleteIcon(); ehMpo BL  
 else if(id==ID_EXIT) {~Q}{ha  
  OnCancel();  N=!k2+  
 return FALSE; T{'oR .g,  
} G{a_\'7  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); es$<Vkbp  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) R!x /,6,_  
 AddIcon(); PnI_W84z  
 return res; +' .o  
} {Sc*AE&Y  
.SWn/Kk  
void CCaptureDlg::AddIcon() OZ<fQf.Gh}  
{ B/JMH 1r  
 NOTIFYICONDATA data; !]z4'*)W  
 data.cbSize=sizeof(NOTIFYICONDATA);  O&dh<  
 CString tip; W#x~x|(c  
 tip.LoadString(IDS_ICONTIP); HJe6h. P  
 data.hIcon=GetIcon(0); Fa X3@Sd!  
 data.hWnd=GetSafeHwnd(); 0v3 8LBH)  
 strcpy(data.szTip,tip); '|yBz1uL  
 data.uCallbackMessage=IDM_SHELL; ]^QO ^{Sz  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; mw\Pv|  
 data.uID=98; 4%SA%]a L1  
 Shell_NotifyIcon(NIM_ADD,&data); }$3pS:_N~  
 ShowWindow(SW_HIDE); \LM{.g zT  
 bTray=TRUE; .;:dG  
} J p0j  
|1+ mHp  
void CCaptureDlg::DeleteIcon() rGQ([e  
{ GM0pHmC  
 NOTIFYICONDATA data; S\2@~*{-8  
 data.cbSize=sizeof(NOTIFYICONDATA); z&.F YGq}  
 data.hWnd=GetSafeHwnd(); 92/_!P>  
 data.uID=98; G8b`>@rZ  
 Shell_NotifyIcon(NIM_DELETE,&data); ?ViU%t8J5  
 ShowWindow(SW_SHOW); 'FG@Rg (  
 SetForegroundWindow(); `] Zil8n  
 ShowWindow(SW_SHOWNORMAL); *!}bU`  
 bTray=FALSE; Xh*Nu HH  
} r{Z4ifSl(  
mr XmM<  
void CCaptureDlg::OnChange() i%r+/D)KvG  
{ Z4T{CwD`D  
 RegisterHotkey(); t8~isuiK  
} 2t#[$2mg\0  
6lQP+! EF  
BOOL CCaptureDlg::RegisterHotkey() RJD(c#r$  
{ Y0o{@)Y:  
 UpdateData(); 2)|G%f_lS  
 UCHAR mask=0; Qf@ha  
 UCHAR key=0; !<0 `c  
 if(m_bControl) ,GF(pCZzG  
  mask|=4; fvV5G,lD3h  
 if(m_bAlt) x0dBg~I  
  mask|=2; .JWN\\  
 if(m_bShift) R& HkWe  
  mask|=1; ,mE}#cyY  
  key=Key_Table[m_Key.GetCurSel()]; 6dqI{T-i?  
 if(bRegistered){ edfb7prfTl  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); [T2!,D.  
  bRegistered=FALSE; SJ&+"S&  
 } S@WT;Q2Z  
 cMask=mask; z3|5E#m  
 cKey=key; 4FJA+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )H*BTfmt  
 return bRegistered; G;^,T/q47  
} O|&SL03Z8  
aydf# [F  
  四、小结 *#o2b-[V  
])Z p|?Y  
  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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