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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: `z?6.+C  
  m:{ws~   
  一、实现方法 @}Y,A~   
e?"XMY  
  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=Th  
G"~%[k  
#pragma data_seg("shareddata") HU='Hk!  
HHOOK hHook =NULL; //钩子句柄 ZV?~~_ 9  
UINT nHookCount =0; //挂接的程序数目 H%AF,  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fNkN  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 V6.w=6:`X  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Mr8r(LGY  
static int KeyCount =0; G{8>  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 8D[,z 7n  
#pragma data_seg() n%"0%A  
S@N:Cj  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 R>05MhA+  
qit D{;  
  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: 2d`:lk%\  
N=`xoF  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /J-:?./  
cKey,UCHAR cMask) g'F{;Ur  
{ ;is*[r\|1  
 BOOL bAdded=FALSE; ?uq7K"B  
 for(int index=0;index<MAX_KEY;index++){ G31??L:<  
  if(hCallWnd[index]==0){ _ zh>q4M  
   hCallWnd[index]=hWnd; .%iJin"  
   HotKey[index]=cKey; ~qk5Mk4$  
   HotKeyMask[index]=cMask; ~sd+ch*  
   bAdded=TRUE; D8b~-#  
   KeyCount++; DV,rh83.ip  
   break; |6mDooTy  
  } :Y AxL J  
 } KG5h$eM'  
 return bAdded; =h#3D?b0n  
} bkZ~O=uv$-  
//删除热键 )kq3q5*_  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )7H s  
{ ;g0p`wV  
 BOOL bRemoved=FALSE; DKcg  
 for(int index=0;index<MAX_KEY;index++){ *t,J4c  
  if(hCallWnd[index]==hWnd){ ?2#v`Z=L;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ K1F,M9 0]  
    hCallWnd[index]=NULL; &?-LL{W{  
    HotKey[index]=0; 7xmyjy%c  
    HotKeyMask[index]=0; :n4X>YL)  
    bRemoved=TRUE; :4ndU:.L  
    KeyCount--;  3e<FlH{  
    break; FzDZ<dJ  
   } *i}Nb* Z3  
  } D9#?l <D  
 } r dc} e"v  
 return bRemoved; Q|^TR__  
} 7d7"^M  
1b6o x6  
~m]sJpW<"  
  DLL中的钩子函数如下: E27N1J+1  
;U +;NsCH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) q66+x)  
{ LOD'iiH6  
 BOOL bProcessed=FALSE; kg>Ymo.  
 if(HC_ACTION==nCode) | Q Y_ci  
 { 3M nm2*\  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 k#4%d1O}  
   switch(wParam) q*<Fy4j  
   {  NbD"O8dL~E  
    case VK_MENU: 6Q&*V7EO  
     MaskBits&=~ALTBIT; y5XHJUTu  
     break; gZ5E%']sT  
    case VK_CONTROL: "iCR68e  
     MaskBits&=~CTRLBIT; 9Yh0' <Z  
     break; J| orvnkK  
    case VK_SHIFT: 09f:%!^u  
     MaskBits&=~SHIFTBIT; Al^n&Aa+\  
     break; 7VF^&6  
    default: //judge the key and send message \~(ww3e  
     break; {|}tp<:2  
   } _d8k[HAJ|  
   for(int index=0;index<MAX_KEY;index++){ iXN7+QO)  
    if(hCallWnd[index]==NULL) [w%MECTe  
     continue; 8-N8v *0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RaK fYLw  
    { Q9lw~"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %f{1u5+5  
     bProcessed=TRUE; d2Z kchf  
    } Q]';1#J\  
   } H$^b.5K  
  } 9I a4PPEH1  
  else if((lParam&0xc000ffff)==1){ //有键按下 ?G5JAG`  
   switch(wParam) .b4_O CGg  
   { 9.KOrg5}L  
    case VK_MENU: :qV}v2  
     MaskBits|=ALTBIT; ;CU<\  
     break; *0 ;DCUv  
    case VK_CONTROL: x*H4o{o0  
     MaskBits|=CTRLBIT; \haJe~  
     break; $c-h'o  
    case VK_SHIFT: dbkkx1{>Y  
     MaskBits|=SHIFTBIT; Q0K4_iN)&  
     break; 00') Ol&  
    default: //judge the key and send message wW3fsXu  
     break; gr'M6&>  
   } D t~Jx\\  
   for(int index=0;index<MAX_KEY;index++){ Y",Fs(  
    if(hCallWnd[index]==NULL) z$3 3NM  
     continue; Kilq Jg1%C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Lm kv .XF  
    { RVFQ!0 C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); })V9d  
     bProcessed=TRUE; ^A8'YTl  
    } Ni5~Buf  
   } la ~T)U7  
  } U!:Q|':=h  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D6iHkDTg  
   for(int index=0;index<MAX_KEY;index++){ Hno:"k?  
    if(hCallWnd[index]==NULL) pV:c`1\`  
     continue; d}K"dr:W5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) SRl:+!@.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |-N\?N9"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 &zsaVm8  
   } Le9^,B@Pb  
  } $oO9N^6yF  
 } 6i/x"vl>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); k zhek >  
} UV%A l)3  
'CT 8vt;  
  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: ^l#Z*0@><~  
#vi `2F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RVv@x5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TIg 3'au  
od{b]HvgS  
  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: y]5O45E0  
;BV1E|j  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) R07Kure  
{ w/r wE  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) U2=l; R{  
 { |3f?1:"Z  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =6b^j]1  
  SaveBmp(); &B uO-  
  return FALSE; SxLu<  
 } gc-yUH0I  
 …… //其它处理及默认处理 #%U5,[<a8  
} _tZT  
WL4{_X  
f&glY`s#  
  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。 `;-K/)/x  
7aVQp3<  
  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。 oD]tHuDa  
cq`v8  
  二、编程步骤 B&&:A4  
^PIU A'  
  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"; _}.BZ[i  
MtC\kTW  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; K!6k<  
oLEqy  
  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; q/,>UtRr  
53d8AJ_@X  
  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; Qvh: hkR  
y^:!]-+  
  5、 添加代码,编译运行程序。 WpE\N0Yg  
(J8 (_MF  
三、程序代码 Tj}H3/2  
J[rpMQ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL <zE,T@c  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) >K$9 (  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ + ^n [B  
#if _MSC_VER > 1000 ~=~|@K  
#pragma once Sw<@u+Z;%  
#endif // _MSC_VER > 1000 ftB-gItV  
#ifndef __AFXWIN_H__ gT$`a  
#error include 'stdafx.h' before including this file for PCH mGZ^K,)&OR  
#endif ZI4[v>  
#include "resource.h" // main symbols :@zz5MB5@  
class CHookApp : public CWinApp g$<Sh.4A  
{ Md_S};!QN6  
 public: v'(p."g  
  CHookApp(); n>?o=_|uR  
  // Overrides I!?-lI@(  
  // ClassWizard generated virtual function overrides UU')V  
  //{{AFX_VIRTUAL(CHookApp) 5Jd(&k8%  
 public: To1 .U)do  
  virtual BOOL InitInstance(); B2Qt tcJ  
  virtual int ExitInstance(); d 6 t#4!  
  //}}AFX_VIRTUAL ?yop#tjCbY  
  //{{AFX_MSG(CHookApp) !, Y1FC  
  // NOTE - the ClassWizard will add and remove member functions here. '{+5+ J  
  // DO NOT EDIT what you see in these blocks of generated code ! P!@b:.$  
  //}}AFX_MSG Q@gmtAp  
  DECLARE_MESSAGE_MAP() 3B#qQ#  
}; Q[EpE,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); c8!q_H~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T:&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {/SUfXq  
BOOL InitHotkey(); 5[3vu p?  
BOOL UnInit(); a"gZw9m@  
#endif H1iewsfzH  
U_ELeW5@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 555j@  
#include "stdafx.h" NO5\|.,Z  
#include "hook.h" KECo7i=e  
#include <windowsx.h> qScc~i Oq  
#ifdef _DEBUG tQ=P.14>:  
#define new DEBUG_NEW P%M Yr"<$E  
#undef THIS_FILE JGl0 (i*|  
static char THIS_FILE[] = __FILE__; ha+)ZF  
#endif D?ojxHe  
#define MAX_KEY 100 +VxzWNs*JP  
#define CTRLBIT 0x04 34S0W]V  
#define ALTBIT 0x02 &Z!O   
#define SHIFTBIT 0x01 yClX!OL  
#pragma data_seg("shareddata") -?L~\WJAL  
HHOOK hHook =NULL; G^E"#F  
UINT nHookCount =0; Kx,#Wg{H  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !Au'WJfE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT [?z`XY_-  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~JhH ,E  
static int KeyCount =0; ASA ]7qyO  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift F uYjrzmx  
#pragma data_seg() OolYQU1_  
HINSTANCE hins; L-Io!msb  
void VerifyWindow(); C s XV0  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 4e OS+&  
//{{AFX_MSG_MAP(CHookApp) (JV [7u -  
// NOTE - the ClassWizard will add and remove mapping macros here. ZBYFQTEE  
// DO NOT EDIT what you see in these blocks of generated code! A=8%2U wI  
//}}AFX_MSG_MAP WUnz  
END_MESSAGE_MAP() e$'|EE.=q+  
!R@v\Eu  
CHookApp::CHookApp() 4yy9m8/  
{ 6! `^}4  
 // TODO: add construction code here, Eod'Esye5  
 // Place all significant initialization in InitInstance JmlMfMpXMs  
} H!N`hEEj>  
cV8Bl="gqe  
CHookApp theApp; yhTC?sf<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) D@.+B`bA  
{ f8ucJ.{"  
 BOOL bProcessed=FALSE; VINb9W}G[  
 if(HC_ACTION==nCode) 8NP|>uaj  
 { i`k{}!F  
  if((lParam&0xc0000000)==0xc0000000){// Key up E~]37!,\\9  
   switch(wParam) k5M3g*  
   { :c03"jvYE  
    case VK_MENU: (r Tn6[ *  
     MaskBits&=~ALTBIT; lqaOLZH  
     break; N{kp^Byim0  
    case VK_CONTROL: jimWLF5Q5"  
     MaskBits&=~CTRLBIT; &Ul8h,qw  
     break; o/dj1a~U  
    case VK_SHIFT: \\U,|}L .  
     MaskBits&=~SHIFTBIT; faTp|T`nY  
     break; Tj(DdR#w  
    default: //judge the key and send message _z6_mmMp  
     break; ( AI gW  
   } c+a"sx\  
   for(int index=0;index<MAX_KEY;index++){ yyZs[5Q  
    if(hCallWnd[index]==NULL) QVT|6znw  
     continue; #E`wqI\'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ec3TY<mVr  
    { #!yW)RG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;q5.\m:  
     bProcessed=TRUE; gXy'@ !  
    } _|^cudRv  
   } a+!r5689  
  } LZ'Y3 *  
  else if((lParam&0xc000ffff)==1){ //Key down n^[VN[ VC  
   switch(wParam) X}f u $2  
   { %p; 'l  
    case VK_MENU: `J l/@bE=  
     MaskBits|=ALTBIT; AQ)DiH  
     break; 1\u{1 V  
    case VK_CONTROL: A WS[e$Mt2  
     MaskBits|=CTRLBIT; nNc>nB1  
     break; V'iT>  
    case VK_SHIFT:  Y%zYO  
     MaskBits|=SHIFTBIT; ny l[d|pVa  
     break; H{1'OC  
    default: //judge the key and send message .X.,.vHx  
     break; &=>|? m8  
   } _48@o^{  
   for(int index=0;index<MAX_KEY;index++) ORDVyb_x  
   { $:}sm0;  
    if(hCallWnd[index]==NULL) +eUWf{(_  
     continue; 8~!9bg6C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ` zoC++hx  
    { Z%4w{T+[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); BJ*8mKi h  
     bProcessed=TRUE; 1`q>*S](  
    } +3d.JQoKl  
   } OAiSE`  
  } v$d^>+Y#  
  if(!bProcessed){ `z1E]{A  
   for(int index=0;index<MAX_KEY;index++){ !+o`,KTYp  
    if(hCallWnd[index]==NULL) *S= c0  
     continue; -\I".8"YE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2~B9 (|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); VKb=)v[K  
   } !kQJ6U  
  } #E;a ;$p  
 } :k/Z|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); s2kom)  
} :ceT8-PBRx  
Va-.  
BOOL InitHotkey() 1e)5D& njS  
{ `:*O8h~i^8  
 if(hHook!=NULL){ ?#0m[k&`  
  nHookCount++; 3uy^o  
  return TRUE; W*WSjuFr2  
 } J#) %{k_  
 else X%R)  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); U$m[{r2M  
  if(hHook!=NULL) {8e4TD9E0  
   nHookCount++; :pw6#yi8`  
  return (hHook!=NULL); /r?EY&9G  
} A$1Gc> C  
BOOL UnInit() WB|N)3-1  
{ @.8FVF  
 if(nHookCount>1){ `gE_u  
  nHookCount--; kP[LS1}*  
  return TRUE; aB^`3J  
 } 2]'cj  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +Ua.\1"6  
 if(unhooked==TRUE){ dw YGhhm  
  nHookCount=0; 6}JW- sA  
  hHook=NULL; f7v|N)  
 } []<N@a6VA>  
 return unhooked; DP6>fzsl  
} s$ZKd  
n eBcS[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qBF}-N_  
{ hOM#j  
 BOOL bAdded=FALSE; VK[`e[.C  
 for(int index=0;index<MAX_KEY;index++){ ,cFBLj(@  
  if(hCallWnd[index]==0){  YF$nL(  
   hCallWnd[index]=hWnd; \F8 :6-  
   HotKey[index]=cKey; q c DJ  
   HotKeyMask[index]=cMask; fl+dL#]  
   bAdded=TRUE; 9R3YUW}s  
   KeyCount++; %T,cR>lw  
   break; tdOox87YK  
  } .`~=1 H\R"  
 } &pFP=|Pq  
 return bAdded; %d^ =$Q  
} LA4,o@V`  
f5P@PG]{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9iM[3uyO  
{ jpt-5@5O  
 BOOL bRemoved=FALSE; u!TMt8+c  
 for(int index=0;index<MAX_KEY;index++){ P*g:rg  
  if(hCallWnd[index]==hWnd){ Q=?YY-*$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \qw1\-q  
    hCallWnd[index]=NULL; q vGP$g  
    HotKey[index]=0; =v6qr~  
    HotKeyMask[index]=0; JLh{>_Rr  
    bRemoved=TRUE; Ocf:73t  
    KeyCount--; V*%Lc9<d  
    break; g93H l&  
   } K-Fro~U  
  } tE"IE$$1  
 } TFI$>Oz|  
 return bRemoved; RCY}JH>}  
} fK10{>E1  
O)D+u@RhH  
void VerifyWindow() @,;VMO  
{ KvNw'3Ua  
 for(int i=0;i<MAX_KEY;i++){ 6g 5Lf)yG  
  if(hCallWnd!=NULL){ v{O(}@  
   if(!IsWindow(hCallWnd)){ &H:2TL!  
    hCallWnd=NULL; k{E!X  
    HotKey=0; DgGG*OXY  
    HotKeyMask=0; CH] +S>$  
    KeyCount--; qrkJ:  
   } UUR` m  
  } -m_H]<lWZ  
 } 8^5@J) R8  
} m:]60koz]o  
m98w0D@Ee  
BOOL CHookApp::InitInstance() Z3N^)j8  
{ ~!#2s'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); <]'1YDA  
 hins=AfxGetInstanceHandle(); u69fYoB'  
 InitHotkey(); T3In0LQ  
 return CWinApp::InitInstance(); H&=fD` Xq  
} g&fq)d  
<4RP:2#  
int CHookApp::ExitInstance() `Oe"s_O#  
{ *ulkqpO  
 VerifyWindow(); ;{Tf:j'g  
 UnInit(); mu@IcIb>  
 return CWinApp::ExitInstance(); L%31>)8  
} 6rh^?B  
H57wzG{xG  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `8b4P>';O'  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) -jcgxQH53  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ FSHC\8siS  
#if _MSC_VER > 1000 a n|bzG  
#pragma once qV:TuR-|w  
#endif // _MSC_VER > 1000 #iAw/a0&  
2}kJN8\F  
class CCaptureDlg : public CDialog .M>g`UW  
{ RFT`r  
 // Construction N&]_U%#Q  
 public: +J  <<me4  
  BOOL bTray; ;C~:C^Q\H  
  BOOL bRegistered; MOIMW+n  
  BOOL RegisterHotkey(); ?xYoCn}Z  
  UCHAR cKey; 8w9?n3z=}  
  UCHAR cMask; p(pL"  
  void DeleteIcon();  ^9 Pae)  
  void AddIcon(); b9"HTQHl  
  UINT nCount; Y%#r&de  
  void SaveBmp(); Cd'K~Ch3  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^ SW!S_&Z2  
  // Dialog Data +a74] H"  
  //{{AFX_DATA(CCaptureDlg) *s (L!+  
  enum { IDD = IDD_CAPTURE_DIALOG }; DUWSY?^c  
  CComboBox m_Key; gbjql+Mx+  
  BOOL m_bControl; pXl *`[0X#  
  BOOL m_bAlt; LHHDD\X   
  BOOL m_bShift; c-=z<:Kf  
  CString m_Path;  y aLc~K  
  CString m_Number; k*!f@ M  
  //}}AFX_DATA Z lR2  
  // ClassWizard generated virtual function overrides CNrK]+>  
  //{{AFX_VIRTUAL(CCaptureDlg) C#:L.qK  
 public: VD+y4t'^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); z0xw0M+X  
 protected: C0[ Z>$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +d JLT}I8M  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6 u}c543  
  //}}AFX_VIRTUAL _OvIi~KW+  
  // Implementation qTrb)95  
 protected: A)641"[  
  HICON m_hIcon; 6 i'kc3w  
  // Generated message map functions );1UbqVPD  
  //{{AFX_MSG(CCaptureDlg) 2sYOO>  
  virtual BOOL OnInitDialog(); DH'0#  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); gYW  
  afx_msg void OnPaint(); TUM7(-,9  
  afx_msg HCURSOR OnQueryDragIcon(); ZGC*BP/  
  virtual void OnCancel(); >NAg*1  
  afx_msg void OnAbout(); /4Jm]"  
  afx_msg void OnBrowse(); N2\{h(*u  
  afx_msg void OnChange(); }o2e&.$4d  
 //}}AFX_MSG +~!\;71:f  
 DECLARE_MESSAGE_MAP() oh.8WlI  
}; #6F/:j;  
#endif Qcs >BOV~  
*S] K@g  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file } .'\IR  
#include "stdafx.h" ?/FCq6o  
#include "Capture.h" g<jgR*TE`  
#include "CaptureDlg.h" O`D,>=[  
#include <windowsx.h> 92 =huV  
#pragma comment(lib,"hook.lib") (cdtUE8  
#ifdef _DEBUG taqmtXU=(  
#define new DEBUG_NEW Jpr`E&%I6  
#undef THIS_FILE "t:9jU  
static char THIS_FILE[] = __FILE__; } TsND6Ws3  
#endif Is#w=s}2  
#define IDM_SHELL WM_USER+1 AlhPT (  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (sL!nRw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^^{7`X u  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; * $v`5rP  
class CAboutDlg : public CDialog tP0!TkTo9  
{ hp!. P1b  
 public: ]97`=,OUg  
  CAboutDlg(); 'X/(M<c  
  // Dialog Data )sG/H8  
  //{{AFX_DATA(CAboutDlg) @;g|styh^  
  enum { IDD = IDD_ABOUTBOX }; 3FhkK/@  
  //}}AFX_DATA 0mYKzJi  
  // ClassWizard generated virtual function overrides jR@J1IR<  
  //{{AFX_VIRTUAL(CAboutDlg) 9 t o2V  
 protected: }4wIfI83K,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :Mzkm^7B  
  //}}AFX_VIRTUAL LL7un_EC  
  // Implementation -:!FQ'/7E  
 protected: Xi"<'E3_  
  //{{AFX_MSG(CAboutDlg) #xe-Yw1!  
  //}}AFX_MSG kbKGGn4u  
  DECLARE_MESSAGE_MAP() X}R Q&k  
}; 8w L%(p  
8 rA'd  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {aVL3QU  
{ k!= jO#)Rd  
 //{{AFX_DATA_INIT(CAboutDlg) 5#hsy;q;[  
 //}}AFX_DATA_INIT v5g]_v*F  
} #SIIhpjA(  
ZGbY  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) jp viX#\S_  
{ *$EcP`K$  
 CDialog::DoDataExchange(pDX); T<S_C$O  
 //{{AFX_DATA_MAP(CAboutDlg) X+;{&Efrl  
 //}}AFX_DATA_MAP " UxKG+   
} x>*#cOVz;C  
GZk{tTv  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) qTi%].F"G  
 //{{AFX_MSG_MAP(CAboutDlg) SVj4K \F  
 // No message handlers @o4n!Ip2x/  
 //}}AFX_MSG_MAP 2:tO"   
END_MESSAGE_MAP() ,BuEX#ZaBl  
Az4a|.  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) NkL>ru!b9  
: CDialog(CCaptureDlg::IDD, pParent) J~(M%] &k^  
{ -wUw)gJbM  
 //{{AFX_DATA_INIT(CCaptureDlg) o.M.zkP a  
  m_bControl = FALSE; 3_cZaru  
  m_bAlt = FALSE; ra>jVE0 `  
  m_bShift = FALSE; ?TEdGe\*  
  m_Path = _T("c:\\"); 3 V{&o,6  
  m_Number = _T("0 picture captured.");  ~N=$%C  
  nCount=0; t?6_^ 08  
  bRegistered=FALSE; a?5R ;I B  
  bTray=FALSE; i.Jk(%c  
 //}}AFX_DATA_INIT `vj"HhC  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 z3 Ro*yJU  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); hB 36o9|9  
} OF/DI)j3  
mjXO}q7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @>4=}z_e  
{ 8@Hl0{q  
 CDialog::DoDataExchange(pDX); Q]"u?Q]  
 //{{AFX_DATA_MAP(CCaptureDlg) h Lv_ER?  
  DDX_Control(pDX, IDC_KEY, m_Key); Gp5[H}8K  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); A@qwD300Vo  
  DDX_Check(pDX, IDC_ALT, m_bAlt); <Z58"dg.5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +tSfx  
  DDX_Text(pDX, IDC_PATH, m_Path); 1 wB2:o<  
  DDX_Text(pDX, IDC_NUMBER, m_Number); HA W57N  
 //}}AFX_DATA_MAP ds|L'7  
} <|R`N)AV;  
~n )<L7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) zv[pfD7a  
//{{AFX_MSG_MAP(CCaptureDlg) 'awZ-$#  
 ON_WM_SYSCOMMAND() |JRaskd  
 ON_WM_PAINT() <$ oI  
 ON_WM_QUERYDRAGICON() ( V^C7ix:  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b am*&E%0K  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Y*q_>kps"  
 ON_BN_CLICKED(ID_CHANGE, OnChange) HMrl!;:  
//}}AFX_MSG_MAP f{j (H?5  
END_MESSAGE_MAP() :jU u_s}  
-&3mOn& (1  
BOOL CCaptureDlg::OnInitDialog() =abBD   
{ zy!mP  
 CDialog::OnInitDialog(); ;0 No@G;z  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); zb=L[2;  
 ASSERT(IDM_ABOUTBOX < 0xF000); cJ#|mzup  
 CMenu* pSysMenu = GetSystemMenu(FALSE); hm+,o_+  
 if (pSysMenu != NULL) JC}oc M j0  
 { Y9_OkcW)  
  CString strAboutMenu; ji :E  
  strAboutMenu.LoadString(IDS_ABOUTBOX); wS%aN@ay3  
  if (!strAboutMenu.IsEmpty()) H% "R _[+  
  { m#kJ((~  
   pSysMenu->AppendMenu(MF_SEPARATOR); [23F0-p  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); EXD Qr'"  
  } i!+Wv-  
 } 6l|,J`G  
 SetIcon(m_hIcon, TRUE); // Set big icon ;&8  
 SetIcon(m_hIcon, FALSE); // Set small icon +K"8Q'&t  
 m_Key.SetCurSel(0); LA%t'n h  
 RegisterHotkey();  01;  
 CMenu* pMenu=GetSystemMenu(FALSE); iD-,C`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); u iEAi  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); oGa8#>  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); w +~,Mv\  
 return TRUE; // return TRUE unless you set the focus to a control x8q3 Njr  
} |r%lJmBB  
xHo iu$i6  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &hri4p/  
{ uBXl ltU  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) pk5W!K  
 { M);@XcS  
  CAboutDlg dlgAbout; U6M3,"?  
  dlgAbout.DoModal(); ~+r"% KnG  
 } zJ7=r#b  
 else k,UezuV  
 { '4J];Nj0  
  CDialog::OnSysCommand(nID, lParam); X \GB:#:X  
 } p z]T9ol~  
} +#IsRiH%>  
V(A p|I:G  
void CCaptureDlg::OnPaint() d|?'yX  
{ k ICZc{} `  
 if (IsIconic()) u{SJ#3C5  
 { !W3bHy:C"  
  CPaintDC dc(this); // device context for painting @cz\'v6E  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); eO?.8OM-a  
  // Center icon in client rectangle 5C&]YT3 )  
  int cxIcon = GetSystemMetrics(SM_CXICON); A0>u9Bn"Qw  
  int cyIcon = GetSystemMetrics(SM_CYICON); aO'lk  
  CRect rect; "`'' eV3  
  GetClientRect(&rect); 8p)*;Y  
  int x = (rect.Width() - cxIcon + 1) / 2; RHOEyXhOA  
  int y = (rect.Height() - cyIcon + 1) / 2; RCvf@[y4  
  // Draw the icon / Q8glLnM  
  dc.DrawIcon(x, y, m_hIcon); 5\6S5JyIL  
 } pf'-(W+  
 else $Z8=QlG>  
 { k@i+gV%  
  CDialog::OnPaint(); @=kDaPme92  
 } /^F$cQX(  
} ]IZn#gnM  
',<B o{  
HCURSOR CCaptureDlg::OnQueryDragIcon() +zz\*  
{ ?-g/hXx;  
 return (HCURSOR) m_hIcon; dLq)Z*r  
} l0%qj(4`6&  
N-g=_86C"  
void CCaptureDlg::OnCancel() $%ts#56*  
{ %1Pn;bUU!  
 if(bTray) 'Lb- +X,  
  DeleteIcon(); D:yj#&I  
  CDialog::OnCancel(); 2V*<HlqOif  
} RIDzNdM>U  
}hPFd  
void CCaptureDlg::OnAbout() cGVIO"(VP  
{ j$TTLFK1  
 CAboutDlg dlg; 9]DMHA@  
 dlg.DoModal(); yK #9)W-  
} A_mVe\(*M  
$aFCe}3b<  
void CCaptureDlg::OnBrowse() >#Obhs|S{C  
{ r- :u*  
 CString str; 8LMO2Wyq  
 BROWSEINFO bi; uIO<6p)  
 char name[MAX_PATH]; }{(dG7G+  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 1oSrhUTy  
 bi.hwndOwner=GetSafeHwnd(); $%3"@$  
 bi.pszDisplayName=name; JQt Bt2  
 bi.lpszTitle="Select folder"; tf5h/:  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; {M.OOEcIp  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <+tSTc4>r  
 if(idl==NULL) _+vE(:T  
  return; >5aZ?#TS1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); VW[!%<  
 str.ReleaseBuffer(); 2qF ?%  
 m_Path=str; mT7B#^H  
 if(str.GetAt(str.GetLength()-1)!='\\') kX2bU$1Q,i  
  m_Path+="\\"; i#lnSJ08  
 UpdateData(FALSE); dV( "g],  
} $z>L $,c>  
2 ;z~xR  
void CCaptureDlg::SaveBmp() E W {vF|  
{ :=iP_*#  
 CDC dc; 8?> #  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); vl "l  
 CBitmap bm; Br,^4w[Hq  
 int Width=GetSystemMetrics(SM_CXSCREEN); e;kH,fHUI3  
 int Height=GetSystemMetrics(SM_CYSCREEN); :&{:$-h!  
 bm.CreateCompatibleBitmap(&dc,Width,Height); `|Wu\X  
 CDC tdc; B`)gXqBt  
 tdc.CreateCompatibleDC(&dc); VJeoO)<j  
 CBitmap*pOld=tdc.SelectObject(&bm); _shoh  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); BXCB/:0  
 tdc.SelectObject(pOld); r^m8kYezQ  
 BITMAP btm; `k 5'nnyP  
 bm.GetBitmap(&btm); d3nMeAI AO  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 8)wxc1  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FKX+ z  
 BITMAPINFOHEADER bih; yFYFFv\?  
 bih.biBitCount=btm.bmBitsPixel; z; dFS  
 bih.biClrImportant=0; 3Dd"qON!  
 bih.biClrUsed=0; J*nQ(*e  
 bih.biCompression=0; ;!ICLkc$  
 bih.biHeight=btm.bmHeight; DaN=NURDV  
 bih.biPlanes=1; 4DYa~ =w  
 bih.biSize=sizeof(BITMAPINFOHEADER); KXQ &u{[<  
 bih.biSizeImage=size; 7j ]d{lD  
 bih.biWidth=btm.bmWidth; +4N7 _Y  
 bih.biXPelsPerMeter=0; N}j]S{j}'  
 bih.biYPelsPerMeter=0; -8r';zR  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &7i o/d\/  
 static int filecount=0; ~^{jfHTlv  
 CString name; 5-3.7CO$  
 name.Format("pict%04d.bmp",filecount++); Zt;dPYq>  
 name=m_Path+name; PLkwtDi+&  
 BITMAPFILEHEADER bfh; cL]vJ`?Ih  
 bfh.bfReserved1=bfh.bfReserved2=0; .;1tu+S  
 bfh.bfType=((WORD)('M'<< 8)|'B'); *Va;ra(V2  
 bfh.bfSize=54+size; =Ts3O0"[  
 bfh.bfOffBits=54; x e~lV  
 CFile bf; *WHQ1geI8  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ V+A9.KoI  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); G<2OL#Y-  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); nD8 Qeem@  
  bf.WriteHuge(lpData,size); iB]xYfQ&@V  
  bf.Close(); lhx"<kR 4  
  nCount++; ;77#$H8)  
 } -&Cb^$.-x  
 GlobalFreePtr(lpData); ","O8'$OC  
 if(nCount==1) :?2@qWaL  
  m_Number.Format("%d picture captured.",nCount); Cj,Yy  
 else d'oh-dj %^  
  m_Number.Format("%d pictures captured.",nCount); p-6Y5$Y  
  UpdateData(FALSE); SWX[|sjdB  
} ?=bqya"Y  
p>g5WebBN  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4P406,T]r  
{ 6ka, FjJ\  
 if(pMsg -> message == WM_KEYDOWN) 4dEfXrMf  
 { {CO]wqEj  
  if(pMsg -> wParam == VK_ESCAPE) - kGwbV}  
   return TRUE; k3HPY}-  
  if(pMsg -> wParam == VK_RETURN) pQ_EJX)  
   return TRUE; /tG0"1{  
 } R">-h;#  
 return CDialog::PreTranslateMessage(pMsg); nOH x^(  
} !iys\ AV  
r@O5{V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) QgR3kc^7/  
{ )g()b"Z #>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ SH009@l_8  
  SaveBmp(); F&Bh\C)]  
  return FALSE; r+0<A.''a  
} Z}8khNCYr  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ y:m ;_U,%c  
 CMenu pop; z(8:7 G  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); vuNt+  
 CMenu*pMenu=pop.GetSubMenu(0); !R 2;]d*  
 pMenu->SetDefaultItem(ID_EXITICON); pM|m*k  
 CPoint pt; ;ewqGDe'3  
 GetCursorPos(&pt); -E$(<Pow~\  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); :Zs i5>MT  
 if(id==ID_EXITICON) tFi'RRZ  
  DeleteIcon(); v_ U$jjO1  
 else if(id==ID_EXIT) >-%}'iz+  
  OnCancel(); @L9C_a  
 return FALSE; pL& Zcpx  
} xy^t_];X  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); LA837P  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) mm l`,t8  
 AddIcon(); DL t"cAW  
 return res; FQ3{~05T  
} |[ )e5Xhd  
(uxe<'Co|  
void CCaptureDlg::AddIcon() $ouw *|<  
{ uZg[PS=@!X  
 NOTIFYICONDATA data; ~l^Q~W-+  
 data.cbSize=sizeof(NOTIFYICONDATA); mB.j?@Y%  
 CString tip; MXsCm(  
 tip.LoadString(IDS_ICONTIP); mBrH`!  
 data.hIcon=GetIcon(0); @U 6jd4?)  
 data.hWnd=GetSafeHwnd(); +sW;p?K7eO  
 strcpy(data.szTip,tip); mw\ z'  
 data.uCallbackMessage=IDM_SHELL; :j)v=qul  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; v7h!'U[/  
 data.uID=98; =hP7 Hea(N  
 Shell_NotifyIcon(NIM_ADD,&data); {\-9^RL  
 ShowWindow(SW_HIDE); &2P+9j>  
 bTray=TRUE; M3 TsalF  
} xk#q_!(j  
@{X<|,W9w  
void CCaptureDlg::DeleteIcon() J [k,S(Y  
{ G0izZWc  
 NOTIFYICONDATA data; ?_@_NV MY  
 data.cbSize=sizeof(NOTIFYICONDATA); BM vGw  
 data.hWnd=GetSafeHwnd(); ^?~WIS  
 data.uID=98; xnR;#Yc  
 Shell_NotifyIcon(NIM_DELETE,&data); y37c&XYq  
 ShowWindow(SW_SHOW);  Fhk 8  
 SetForegroundWindow(); >iKbn  
 ShowWindow(SW_SHOWNORMAL);  jO5,PTV  
 bTray=FALSE; OxC8xB;`  
} <\fB+ AZ  
,\Q^[e!m~  
void CCaptureDlg::OnChange() oOAn 5t@  
{ C3]"y7  
 RegisterHotkey(); YAc~,N   
} dPm_jX  
G2[? b2)8  
BOOL CCaptureDlg::RegisterHotkey() )@Vz,f\}  
{ k$ORVU  
 UpdateData(); e!B>M{  
 UCHAR mask=0; ^E#i5d+'N  
 UCHAR key=0; . XVW2ISv  
 if(m_bControl) it#,5#Y:  
  mask|=4; \ ";^nk*  
 if(m_bAlt) n9w(Z=D\  
  mask|=2; na4^>:r~  
 if(m_bShift) u^ 3,~:E  
  mask|=1; JQ~[$OGH  
  key=Key_Table[m_Key.GetCurSel()]; SJJ[y"GvD  
 if(bRegistered){ "C/X#y   
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); &Rp/y%9  
  bRegistered=FALSE; )ZQ>h{}D  
 } gic!yhsS_  
 cMask=mask; !P"@oJ/Yy_  
 cKey=key; XzD+#+By  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Q`B K R]/  
 return bRegistered; mWP1mc:M(  
} uE]Z,`e  
* q$O6B-  
  四、小结 A hCqQ.O71  
j`o_Stbg  
  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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