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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: 7}`FXB  
  \9`.jB~<  
  一、实现方法 Rr}m(e=  
gMp' S  
  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: oN`khS]_v0  
 R*r"};  
#pragma data_seg("shareddata") Pc<0kQg  
HHOOK hHook =NULL; //钩子句柄 9_ZGb"(Lj  
UINT nHookCount =0; //挂接的程序数目 YPA$38  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 T1'\!6_5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5=R]1YI~$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  GInw7  
static int KeyCount =0; Q 9E.AN  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &y7xL-xP  
#pragma data_seg() {d.K)8\  
9!.S9[[N  
  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。  ;v/un  
!OMCsUZ  
  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: >]uu?!PU  
dN7.W   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Xg;;< /Z  
cKey,UCHAR cMask) mA@!t>=oMq  
{ kI2+&  
 BOOL bAdded=FALSE; Ejnk\8:  
 for(int index=0;index<MAX_KEY;index++){ '8(UiB5d  
  if(hCallWnd[index]==0){ C>SO d]  
   hCallWnd[index]=hWnd; ^'fgQyj  
   HotKey[index]=cKey; y>)c?9X  
   HotKeyMask[index]=cMask; Y?L>KiM$  
   bAdded=TRUE; _]{LjJ!M  
   KeyCount++; nzbAQ3v  
   break; $VhY"<  
  } "oyBF CW  
 } \xcf<y3_  
 return bAdded; g's!\kr  
} ~Yc!~Rz  
//删除热键 D4uAwmc  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?% A 2  
{ [B+:)i  
 BOOL bRemoved=FALSE; e1%kW1Z9  
 for(int index=0;index<MAX_KEY;index++){ %?Q&a ]  
  if(hCallWnd[index]==hWnd){ 9ExI,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6ud<U#\b&  
    hCallWnd[index]=NULL; >0uj\5h)I]  
    HotKey[index]=0; {s@ 0<!  
    HotKeyMask[index]=0; 5:C>:pAV  
    bRemoved=TRUE; >s1?rC  
    KeyCount--; `5rfO6 ;  
    break; [HL>Lp&A?  
   } xW2?\em  
  } $?dQ^]<,  
 } sZ;Gb^{Z  
 return bRemoved;  1'F!C  
} @^o7UzS4z  
M|zTs\1I  
! h92dH  
  DLL中的钩子函数如下: eTay/i<-  
^P*-bV4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~>P(nI  
{ U<E]c 4*  
 BOOL bProcessed=FALSE; d={o|Mf  
 if(HC_ACTION==nCode) YBR)S_C$_  
 { f1;@a>X  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 OiS\tK?|GV  
   switch(wParam) pjs4FZ`Pd;  
   {  0s\ -iub=d  
    case VK_MENU: X8-x$07)  
     MaskBits&=~ALTBIT; <XtE|LG  
     break; /+8VW;4|I  
    case VK_CONTROL: KY%{'"'u  
     MaskBits&=~CTRLBIT; rs( e  
     break; f re5{=@  
    case VK_SHIFT: : @eHV=|+>  
     MaskBits&=~SHIFTBIT; 5G$ ,2i(  
     break; "z;R"sv\  
    default: //judge the key and send message ~"<^4h  
     break; |lZp5MOc  
   } ~(7ct*U~  
   for(int index=0;index<MAX_KEY;index++){ _N)&<'lB<  
    if(hCallWnd[index]==NULL) 1iNMgA  
     continue; =p"ma83  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d>F.C>  
    {  ST0TWE'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); r-*6# "  
     bProcessed=TRUE; GN:|b2 "  
    } t`R{N1  
   } ^!0z+M:>^  
  } .l5-i@=W  
  else if((lParam&0xc000ffff)==1){ //有键按下 ^E:-Uy  
   switch(wParam) O&yAFiCd  
   { ,D]g]#Lq  
    case VK_MENU: 72.Msnn  
     MaskBits|=ALTBIT; \=]`X2Ld  
     break; ~8"oH5  
    case VK_CONTROL: 6,MQT,F  
     MaskBits|=CTRLBIT; C&R U  
     break; oveK;\7/m  
    case VK_SHIFT: "v( pluN|  
     MaskBits|=SHIFTBIT; V aG Qre  
     break; ICr.Gwe3_  
    default: //judge the key and send message [t$ r)vX  
     break; aM(#J7;  
   } P=6d<no&<  
   for(int index=0;index<MAX_KEY;index++){ G_ ,9h!e  
    if(hCallWnd[index]==NULL) h/5S2EB0!O  
     continue; I,`;#Q)nx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mfS}+_ C  
    { KfYU.Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); CV_M |  
     bProcessed=TRUE; he:z9EG}  
    } W$()W)   
   } <lWj-+m  
  } &1?6Q_p6c  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 /BD'{tZ]Sl  
   for(int index=0;index<MAX_KEY;index++){ YD;d*E%t  
    if(hCallWnd[index]==NULL) X1o^MMpz(F  
     continue; @rDBK] V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *|<~IQg  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wfpl]d!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 LHXR7Fjc  
   } &5${k'  
  } C"B'Dj  
 } Yf~Kzv1]*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); `]]<.>R  
} 4Orq;8!BW  
0I<L<^s3^U  
  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: R=<::2_Y96  
s2wDJ|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F:q8.^HTJ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); DR:DXJc  
B RskxyL&,  
  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: ;1 {=t!z=  
UnP<`z#  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (GC5r#AnS  
{ ]'M B3@T  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) #+V4<o  
 { VltM{-k^  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6)ln,{  
  SaveBmp(); W=w]`'  
  return FALSE; saQs<1  
 } Q"nw.FjUG  
 …… //其它处理及默认处理 0Xw>_#Y/xS  
} 1[u{y{9 q  
C.ji]P#  
H!u8+  
  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。 [fV"tf;  
KK2YT/K$SG  
  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。 !4=_l6kg~+  
^v'0\(H?P  
  二、编程步骤 G.~ Q2O#T  
{wj%WSQj/y  
  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"; L 6fbR-&Lt  
/|i*'6*  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; fCF.P"{W"  
X&LJ"ahK  
  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; v[{7\Hha  
-3v\ c~  
  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; 5N%d Les  
58HA*w  
  5、 添加代码,编译运行程序。 6Aq]I$  
!rAH@y.l  
三、程序代码 b @0= &4  
3di;lzGq  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 0XCAnMVo  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 6QbDU[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ KN`k+!@/7  
#if _MSC_VER > 1000 G?=&\fg_:  
#pragma once jll:Rh(b  
#endif // _MSC_VER > 1000 zhd1)lgY  
#ifndef __AFXWIN_H__ 3*2~#dh=  
#error include 'stdafx.h' before including this file for PCH :r hB=  
#endif rTR"\u7&H  
#include "resource.h" // main symbols buN@O7\  
class CHookApp : public CWinApp fW+ "Kuw  
{ {d;z3AB  
 public: saP%T~  
  CHookApp(); l5Ko9CG  
  // Overrides d~%7A5  
  // ClassWizard generated virtual function overrides y*{zX=]l<  
  //{{AFX_VIRTUAL(CHookApp) gN:F50   
 public: T1.U (::  
  virtual BOOL InitInstance(); M'<% d[  
  virtual int ExitInstance(); z EtsMU  
  //}}AFX_VIRTUAL aK;OzB)  
  //{{AFX_MSG(CHookApp) b~:)d>s8wY  
  // NOTE - the ClassWizard will add and remove member functions here. KB|mtsi  
  // DO NOT EDIT what you see in these blocks of generated code ! %A'mXatk  
  //}}AFX_MSG {.A N4  
  DECLARE_MESSAGE_MAP() ;hO6 p  
}; _.V5-iN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); =RD>#'sUK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @0 P4pt;(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9t)Hi qj  
BOOL InitHotkey(); *8?2+ )5"  
BOOL UnInit(); g`S;xs  
#endif iJ^}{-  
mHW%:a\L  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. vr4r,[B6y  
#include "stdafx.h" E~fb#6  
#include "hook.h" gggD "alDx  
#include <windowsx.h> TmLCmy!  
#ifdef _DEBUG sBa:|(Y.  
#define new DEBUG_NEW d wG!]j>:_  
#undef THIS_FILE ud5}jyJ  
static char THIS_FILE[] = __FILE__; 3lZl  
#endif vVvF e~y]  
#define MAX_KEY 100 nCWoco.xy  
#define CTRLBIT 0x04 gFHBIN;u  
#define ALTBIT 0x02 2p](`Y`  
#define SHIFTBIT 0x01 S%}G 8Ty  
#pragma data_seg("shareddata") v"ORn5  
HHOOK hHook =NULL; T5zS3O  
UINT nHookCount =0; >zX^*T#  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Q;y5E`G  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT .-M5.1mo\(  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )G^k$j  
static int KeyCount =0; ]-{ fr+  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift }aE'  
#pragma data_seg() xO>z )3A  
HINSTANCE hins; %|}*xMQ  
void VerifyWindow(); Oj_]`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) qna!j|90Lp  
//{{AFX_MSG_MAP(CHookApp)  dV :}  
// NOTE - the ClassWizard will add and remove mapping macros here. \u[}  
// DO NOT EDIT what you see in these blocks of generated code! 7AT8QC`u  
//}}AFX_MSG_MAP R3_OCM_*  
END_MESSAGE_MAP() [.xY>\e  
*w(n%f  
CHookApp::CHookApp() t :YZua  
{ GLecBF+>F  
 // TODO: add construction code here,  2hF^U+I}  
 // Place all significant initialization in InitInstance 4>V@+#Ec5  
} P}5bSQ( a3  
1mJUl x  
CHookApp theApp; JZ-@za6u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sYDav)L.  
{ c:0n/DC  
 BOOL bProcessed=FALSE; !;*flr`/  
 if(HC_ACTION==nCode) b_F1?:#  
 { )2ShoFF  
  if((lParam&0xc0000000)==0xc0000000){// Key up v5a\}S<(  
   switch(wParam) Ly8=SIZ   
   { bHRn}K+<}c  
    case VK_MENU: xJ{r9~  
     MaskBits&=~ALTBIT; I@Hx LEGj  
     break; iu8Q &Us0P  
    case VK_CONTROL: 96~y\X@x  
     MaskBits&=~CTRLBIT; lPxhqF5pP  
     break; T})q/oUqK  
    case VK_SHIFT: "o`?-bQ:  
     MaskBits&=~SHIFTBIT; iQ:eR]7X  
     break; %?].( Lc  
    default: //judge the key and send message %M1l[\N  
     break; P7=`P  
   } (["kbPma  
   for(int index=0;index<MAX_KEY;index++){ =l/Dc=[  
    if(hCallWnd[index]==NULL) }B7Txo,Z  
     continue; |}z5ST%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) OeASB}  
    { mm +V*L{x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); U&])ow):  
     bProcessed=TRUE; hGV_K"~I0  
    } +W[f>3`VQ  
   } }W:Z>vam+  
  } 8,IF%Z+LI  
  else if((lParam&0xc000ffff)==1){ //Key down 5|~g2Zz{;  
   switch(wParam) qqZ4K:oC,  
   { tT)s,R%  
    case VK_MENU: >Z_;ZMu)  
     MaskBits|=ALTBIT; tkk8b6%h?p  
     break; PjBAf'  
    case VK_CONTROL: , v} )  
     MaskBits|=CTRLBIT; q&>fKSnKs  
     break; V~KWy@7  
    case VK_SHIFT: f?/OV*  
     MaskBits|=SHIFTBIT; RN)XIf$@_  
     break; r&a} U6k(y  
    default: //judge the key and send message h.#:7d(g  
     break; :$K=LV#Iru  
   } lq_UCCnv5  
   for(int index=0;index<MAX_KEY;index++) C=o-3w  
   { ,i}EGW,9q  
    if(hCallWnd[index]==NULL) M| Gl&   
     continue; hR|xUp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \\:%++}J  
    {  ;303fS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); zo@vuB.  
     bProcessed=TRUE; vv,<#4d  
    } Z ;rM@x  
   } %XukiA+  
  } }(u:K}8  
  if(!bProcessed){ PRiE2Di2S  
   for(int index=0;index<MAX_KEY;index++){ kZ@UQ{>`  
    if(hCallWnd[index]==NULL) wg0_J<y]  
     continue; 4_VgJ9@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) V1M|p!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Q3hf =&$  
   } *GXPN0^Qjo  
  } Axb=1_--  
 } x1g-@{8]j  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -j<E_!t  
} &_:9.I 1  
YFu,<8"swe  
BOOL InitHotkey() / S' +  
{ &1T)'Bn  
 if(hHook!=NULL){ 3xz~##  
  nHookCount++; Brs6RkRf  
  return TRUE; ~fD\=- S1  
 } DTA$,1JuD  
 else x f{`uHa8  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 9O&gR46.  
  if(hHook!=NULL) R[\1Kk(Zo  
   nHookCount++; ylczM^@  
  return (hHook!=NULL); Q]=/e7  
} \='LR!_  
BOOL UnInit() JL#LCU ?  
{ @Hp%4$=  
 if(nHookCount>1){ x[TLlV:{  
  nHookCount--; WxYEu +_  
  return TRUE; YJ ,"@n_  
 } iNkN'("  
 BOOL unhooked = UnhookWindowsHookEx(hHook);  ~ e?af  
 if(unhooked==TRUE){ QlB9m2XB  
  nHookCount=0; )=gU~UV  
  hHook=NULL; nU{Qi;0  
 } ?0dmw?i  
 return unhooked; }[|9vF"g.y  
} [g}#R#Y)  
vde!k_,wZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^"I@ 8k  
{ w+ ')wyB  
 BOOL bAdded=FALSE; hC"'cUrcN  
 for(int index=0;index<MAX_KEY;index++){ qZ>_{b0f  
  if(hCallWnd[index]==0){ -!7Z  
   hCallWnd[index]=hWnd; HTiLA%%6  
   HotKey[index]=cKey; {9|*au(K  
   HotKeyMask[index]=cMask; ;|XX^  
   bAdded=TRUE;  #9}1Lo>  
   KeyCount++; z0\ $# r^I  
   break; tQNc+>7k+u  
  } $2*_7_Qb  
 } O95gdxc  
 return bAdded; aKW-(5<JW  
} "[]oWPOj  
MkGQ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ehB '@_y  
{ %k?/pRv$>  
 BOOL bRemoved=FALSE; AfO.D ?4x  
 for(int index=0;index<MAX_KEY;index++){ T.z efoZ  
  if(hCallWnd[index]==hWnd){ 1(T2:N(M-A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )skpf%g  
    hCallWnd[index]=NULL; 3 []ltN_  
    HotKey[index]=0; Yg5o!A  
    HotKeyMask[index]=0; o` QH8  
    bRemoved=TRUE; aJ=)5%$6kc  
    KeyCount--; q0ab]g+  
    break; cyd&bxPgj+  
   } C=Fu1Hpb  
  } *wx%jbJo  
 } l%Ke>9C  
 return bRemoved; R*cef  
} W.{+0xx  
H~#$AD+H  
void VerifyWindow() JT<JS6vw#  
{ 'tkQz  
 for(int i=0;i<MAX_KEY;i++){ MaPhG<?  
  if(hCallWnd!=NULL){ @6~m&$R/  
   if(!IsWindow(hCallWnd)){ ;,]4A{|  
    hCallWnd=NULL; k9H}nP$F  
    HotKey=0; qB@N|Bb  
    HotKeyMask=0; $;=^|I4E  
    KeyCount--; ktfxb <%  
   } J3oUtu  
  } n4{?Odrf  
 } 4IOqSB|  
} &x*l{s[  
l{3zlXk3z  
BOOL CHookApp::InitInstance() n?6^j8i  
{ _?felxG[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); %LHt{:9.  
 hins=AfxGetInstanceHandle(); )R<93`q  
 InitHotkey(); ,@ p4HN*  
 return CWinApp::InitInstance(); 7~1Fy{tc  
} CaED(0  
R86i2',  
int CHookApp::ExitInstance() nt&% sM-X  
{ ^FNju/b  
 VerifyWindow(); yRQ1Szbjli  
 UnInit(); qh}+b^Wi  
 return CWinApp::ExitInstance();  = v?V  
} YwH Fn+  
O+'k4  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @Jd eOL;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3:$@DZT$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %kkDitmI{  
#if _MSC_VER > 1000 r&v!2A]:  
#pragma once U . <c#S  
#endif // _MSC_VER > 1000 Hxac#(,7  
sng6U;Z  
class CCaptureDlg : public CDialog Zd-QZ<c";t  
{ O:,Gmft+  
 // Construction ?G9DSk?6%Z  
 public: *b{Hj'HaH  
  BOOL bTray; /'VuMMJ2  
  BOOL bRegistered; 1bw$$QXC_  
  BOOL RegisterHotkey(); ODpAMt"  
  UCHAR cKey; {='wGx  
  UCHAR cMask; D=D.s)ns*  
  void DeleteIcon(); $@^\zg1n  
  void AddIcon(); H%=;pD>o  
  UINT nCount; Xe`$SNM  
  void SaveBmp(); ^f(El(w  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4R01QSbd  
  // Dialog Data fCs{%-6cP  
  //{{AFX_DATA(CCaptureDlg) $b^niL  
  enum { IDD = IDD_CAPTURE_DIALOG }; -; d{}F  
  CComboBox m_Key; 96!2 @c{  
  BOOL m_bControl; XF3lS#pt  
  BOOL m_bAlt; {<Y!'WL{  
  BOOL m_bShift; r4 5}o  
  CString m_Path; !p36OEx  
  CString m_Number; X H!n{Of  
  //}}AFX_DATA lt5Knz2G,Z  
  // ClassWizard generated virtual function overrides $mq+/|bn  
  //{{AFX_VIRTUAL(CCaptureDlg) MfI+o<{r  
 public: .VmRk9Z  
  virtual BOOL PreTranslateMessage(MSG* pMsg); J1M9) ,  
 protected: ,5~C($-t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9w0v?%%_  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]-heG'y]{  
  //}}AFX_VIRTUAL f@Ve,i  
  // Implementation D&N3LH  
 protected: 0iMfyW:  
  HICON m_hIcon; C^]UK  
  // Generated message map functions PK{FQ3b2{  
  //{{AFX_MSG(CCaptureDlg) )P+<=8@a  
  virtual BOOL OnInitDialog(); #MMp0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1!+0]_8K  
  afx_msg void OnPaint(); 3$_- 0>  
  afx_msg HCURSOR OnQueryDragIcon(); X,8Zn06M  
  virtual void OnCancel(); _-v$fDrz  
  afx_msg void OnAbout();  SBi4i;qD  
  afx_msg void OnBrowse(); :< ]sJf N  
  afx_msg void OnChange(); u1z!OofN>  
 //}}AFX_MSG b'/:e#F  
 DECLARE_MESSAGE_MAP() JAwEu79sh  
}; `i~J0#P  
#endif 5Ktll~+:#  
cqb6]  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file hJ4 A5m.  
#include "stdafx.h" axXR-5c  
#include "Capture.h" ;'!h(H  
#include "CaptureDlg.h" I[ 06R  
#include <windowsx.h> 2of+KI:  
#pragma comment(lib,"hook.lib") I.2>d_^<  
#ifdef _DEBUG F Zt;D  
#define new DEBUG_NEW 7=wQ#bq"1P  
#undef THIS_FILE -s91/|n  
static char THIS_FILE[] = __FILE__; Ym-mfWo^#  
#endif !;k ^  
#define IDM_SHELL WM_USER+1 [[4!b E  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3)^ 2X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zJ8jJFL+Y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; S~g "  
class CAboutDlg : public CDialog PIsXX#`7;  
{ 4!M0)Nix  
 public: `RqV\ 6G+  
  CAboutDlg(); 0V2~  
  // Dialog Data Us>n`Lj@  
  //{{AFX_DATA(CAboutDlg) ]h=y  
  enum { IDD = IDD_ABOUTBOX }; :`@W`V?6-  
  //}}AFX_DATA W3MH8z   
  // ClassWizard generated virtual function overrides p5nrPL  
  //{{AFX_VIRTUAL(CAboutDlg) tKi ^0vE8  
 protected: <V8=*n"mR  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qV$0 ";d  
  //}}AFX_VIRTUAL %we! J%'Y]  
  // Implementation s"wz !{G4  
 protected: =NRiro  
  //{{AFX_MSG(CAboutDlg) Tkh?F5l  
  //}}AFX_MSG dTU`@!f  
  DECLARE_MESSAGE_MAP() (b.Mtd  
}; y<yU5  
AX{yfL  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ojp|/yd^YL  
{ iA"H*0  
 //{{AFX_DATA_INIT(CAboutDlg) /'>ck2drjk  
 //}}AFX_DATA_INIT U}-hV@y  
} s*>B"#En  
DK%@ [D  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) bde6 ;=oM  
{ Y$ ZDJNz  
 CDialog::DoDataExchange(pDX); m?1AgsBR  
 //{{AFX_DATA_MAP(CAboutDlg) uKT\\1Jrq  
 //}}AFX_DATA_MAP {~=gKZ:-@  
} D rouEm  
yyjgPbLN=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 61z^(F$@  
 //{{AFX_MSG_MAP(CAboutDlg) Wb{8WPS  
 // No message handlers **n109R  
 //}}AFX_MSG_MAP Q>/[*(.Wd  
END_MESSAGE_MAP() %BkPkQA  
"Z a}p|Ct  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 5PKdMEK|q  
: CDialog(CCaptureDlg::IDD, pParent) G^\.xk]  
{ fd1z XK#Z2  
 //{{AFX_DATA_INIT(CCaptureDlg) pA5X<)~   
  m_bControl = FALSE; jpfFJon)w  
  m_bAlt = FALSE; 8{-bG8L> 5  
  m_bShift = FALSE; `?(9Bl  
  m_Path = _T("c:\\"); k8ymOx  
  m_Number = _T("0 picture captured."); iM{aRFL  
  nCount=0; }RkD7  
  bRegistered=FALSE; Ktf lbI!  
  bTray=FALSE; Io)@u~yz  
 //}}AFX_DATA_INIT E njSio0  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 </h}2x  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); z Q11dLjs  
} .\AbE*lZ#  
&qeM YYY  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;c>IM]  
{ 4p/d>DTiM  
 CDialog::DoDataExchange(pDX); 4ko(bW#jL  
 //{{AFX_DATA_MAP(CCaptureDlg) =a./HCF  
  DDX_Control(pDX, IDC_KEY, m_Key); -(![xZ1{K  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); kM@heFJb.  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^WIGd"^  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); JVNp= ikK  
  DDX_Text(pDX, IDC_PATH, m_Path); B#x.4~YX  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ;kF+V*  
 //}}AFX_DATA_MAP " [K>faV  
} Hz3KoO &  
*8xMe  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 1"} u51  
//{{AFX_MSG_MAP(CCaptureDlg) %>k$'UWzK  
 ON_WM_SYSCOMMAND() 5 ]@"f/  
 ON_WM_PAINT() H5p&dNO  
 ON_WM_QUERYDRAGICON() g=n /w  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) A{QA0X!p  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Q|:qs\6q5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ]kyGm2Ty9  
//}}AFX_MSG_MAP Fop'm))C8  
END_MESSAGE_MAP() vBjrI*0  
wO ?A/s  
BOOL CCaptureDlg::OnInitDialog() ,qO2D_  
{ %$SO9PY  
 CDialog::OnInitDialog(); [NIaWI,>  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); i;}mIsNBY  
 ASSERT(IDM_ABOUTBOX < 0xF000); +`~6Weay  
 CMenu* pSysMenu = GetSystemMenu(FALSE); y8=H+Y  
 if (pSysMenu != NULL) A<s9c=d6  
 { qCgoB 0  
  CString strAboutMenu; 97L# 3L6t  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ygfUy  
  if (!strAboutMenu.IsEmpty()) R8<P}mv  
  { "94qBGf  
   pSysMenu->AppendMenu(MF_SEPARATOR); %13V@'e9  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); jr=erVHK  
  } f 8836<c  
 } @t?uhT*Z=  
 SetIcon(m_hIcon, TRUE); // Set big icon O0 ,=@nw8.  
 SetIcon(m_hIcon, FALSE); // Set small icon |4|j5<5  
 m_Key.SetCurSel(0); `%S#XJU  
 RegisterHotkey(); l^E)XWd  
 CMenu* pMenu=GetSystemMenu(FALSE); c0u1L@tj  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "AUHe6Yv  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .=<<b|  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?mJ&zf|B8  
 return TRUE; // return TRUE unless you set the focus to a control M[7$cfp-Y~  
} _mn2bc9M  
ORP-@-dap  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) V`XtGTx  
{ +LsACSB  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ub-q0[6  
 { 1=Nh<FuQ  
  CAboutDlg dlgAbout; ct![eWsuB  
  dlgAbout.DoModal(); ~zT743  
 } R\d)kcy4  
 else tKKQli4Mn4  
 { ,c9K]>8m`  
  CDialog::OnSysCommand(nID, lParam); =S:Snk%  
 } R;EdYbiF b  
} zyi;vu  
w_]`)$9  
void CCaptureDlg::OnPaint() p? L*vcU  
{ k]9v${Ke  
 if (IsIconic()) 'WQ?%da  
 { - HiRXB  
  CPaintDC dc(this); // device context for painting 8Xjp5  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2\J-7o=P  
  // Center icon in client rectangle C6{\^kG^j2  
  int cxIcon = GetSystemMetrics(SM_CXICON); <P1yA>=3`  
  int cyIcon = GetSystemMetrics(SM_CYICON); Th>ff)~ e  
  CRect rect; 8%Hc%T[RnT  
  GetClientRect(&rect); N-:.z]j#_  
  int x = (rect.Width() - cxIcon + 1) / 2; S{#L7S  
  int y = (rect.Height() - cyIcon + 1) / 2; kx31g,cf]w  
  // Draw the icon w=feXA3-S  
  dc.DrawIcon(x, y, m_hIcon); /@QPJ~%8Ud  
 } @pkQ2OM 2  
 else ap|$8 G  
 { T_/ n#e  
  CDialog::OnPaint(); 0l+[[ZTV  
 } * faG0le  
} <Po$|$_~  
-h8@B+  
HCURSOR CCaptureDlg::OnQueryDragIcon() c1aIZ  
{ r!e:sJAB.  
 return (HCURSOR) m_hIcon; WCUaXvw  
} h"$)[k~  
mfCp@1;26  
void CCaptureDlg::OnCancel() G3_HX<|f*  
{ qbD>)}:1  
 if(bTray) ykat0iqo  
  DeleteIcon(); oo2CF!Xy  
  CDialog::OnCancel(); 5~GH*!h%;  
} H=v=)cUe[  
$1}Y4>3  
void CCaptureDlg::OnAbout() 7X`]}z4g  
{ &Xh_`*]ox  
 CAboutDlg dlg; My<.^~  
 dlg.DoModal(); PQJw"[N/YM  
} <`'T#e$  
5/YGu=,  
void CCaptureDlg::OnBrowse() ^ i8"eF  
{ X([p0W 9V(  
 CString str; :` >bh  
 BROWSEINFO bi; {j[a'Gb  
 char name[MAX_PATH]; JBk >|q"  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ^aR^M\38  
 bi.hwndOwner=GetSafeHwnd(); []b= xRJM  
 bi.pszDisplayName=name; T7R,6 qt  
 bi.lpszTitle="Select folder"; r%\%tz'`j  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %i5tf;x6i  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); '@dk3:3t  
 if(idl==NULL) >yf}9Zs  
  return; ~`X$b F  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); g$ h`.Fk,  
 str.ReleaseBuffer(); >0E3Em<(}l  
 m_Path=str; Nbb2wr9A  
 if(str.GetAt(str.GetLength()-1)!='\\') @id!F<+%oD  
  m_Path+="\\"; AjD? _DPc  
 UpdateData(FALSE); ,s`4k?y  
} 4@r76v}{  
#Oi{7~  
void CCaptureDlg::SaveBmp() w8}jmpnI  
{ )m_q2xV  
 CDC dc; l/-qVAd!q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); wQX18aF/#d  
 CBitmap bm; ~CuJ$(9Y  
 int Width=GetSystemMetrics(SM_CXSCREEN); R4vf  
 int Height=GetSystemMetrics(SM_CYSCREEN); YHzP/&0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); U%)-_ *`z  
 CDC tdc; =*{Ii]D  
 tdc.CreateCompatibleDC(&dc); k&lfxb9pd  
 CBitmap*pOld=tdc.SelectObject(&bm); 1+ 9!W  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ]FEDAGu  
 tdc.SelectObject(pOld); }'`}| pM$  
 BITMAP btm; 3/V0w|ZgD  
 bm.GetBitmap(&btm); |.;*,bb|3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; t?wVh0gT  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); T~8kKw  
 BITMAPINFOHEADER bih; s"5wnp6pW  
 bih.biBitCount=btm.bmBitsPixel; Y1G/1Z# 2  
 bih.biClrImportant=0; (f;.`W  
 bih.biClrUsed=0; p^k*[3$0  
 bih.biCompression=0; Zu /w[*;M  
 bih.biHeight=btm.bmHeight; L$6W,D  
 bih.biPlanes=1; p|g7Z  
 bih.biSize=sizeof(BITMAPINFOHEADER); m:6*4_!  
 bih.biSizeImage=size; \+j:d9?  
 bih.biWidth=btm.bmWidth; ),J6:O&  
 bih.biXPelsPerMeter=0; ~9Qd83`UH  
 bih.biYPelsPerMeter=0; 4s 6,`-  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 4JRQ=T|P7I  
 static int filecount=0; zZ94_8b  
 CString name; 5,J.$Sax  
 name.Format("pict%04d.bmp",filecount++); CsEU:v  
 name=m_Path+name; A|YiSwyy  
 BITMAPFILEHEADER bfh;  o .*t  
 bfh.bfReserved1=bfh.bfReserved2=0; t:"%d9]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); P'^& SK  
 bfh.bfSize=54+size; MM6PaD{  
 bfh.bfOffBits=54; -"rANP-UI  
 CFile bf; ^hcK&  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ c#-*]6x  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); &H[7UyC  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); KW!+Ws  
  bf.WriteHuge(lpData,size); gx8i|]  
  bf.Close(); Tvt(nWn(H1  
  nCount++; 5Od&-~O  
 } t;`ULp~&  
 GlobalFreePtr(lpData); /ke[nr  
 if(nCount==1) Z7>Nd$E{  
  m_Number.Format("%d picture captured.",nCount); g}d[j I9  
 else i.{.koH<  
  m_Number.Format("%d pictures captured.",nCount); 6O_l;A[=1  
  UpdateData(FALSE); OIDP#K  
} rl,i,1t  
_nM 7SK  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) iJ`zWpj+{Q  
{ KL./  
 if(pMsg -> message == WM_KEYDOWN) gC(@]%  
 { 2 fg P  
  if(pMsg -> wParam == VK_ESCAPE) p-xG&CU  
   return TRUE; +8Y|kC{9"  
  if(pMsg -> wParam == VK_RETURN) g7{:F\S  
   return TRUE; dQ_hlx!J  
 } (|>rDk;  
 return CDialog::PreTranslateMessage(pMsg); izzX$O[=:  
} Tgl >  
PS8^=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) AH-BZ8  
{ \OXQ%J2v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ eD8e0 D'S  
  SaveBmp(); gVrfZ&XF84  
  return FALSE; !hjF"Pa  
} KciN"g|X  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ckc5;:b&m  
 CMenu pop; kj6H+@ {  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #lO ^PK  
 CMenu*pMenu=pop.GetSubMenu(0); [=",R&uD$  
 pMenu->SetDefaultItem(ID_EXITICON); `Tei  
 CPoint pt; C80< L5\  
 GetCursorPos(&pt); b +Z/nfS  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); z;MPp#Y  
 if(id==ID_EXITICON) ;2$0j1>  
  DeleteIcon(); \_YDSmjy  
 else if(id==ID_EXIT) wbvOf X  
  OnCancel(); ksTK'7*  
 return FALSE; 4)8e0L*[B?  
} HYL['B?Wid  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )x~ /qHt  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PE g]z  
 AddIcon(); 4Y1dkg1y  
 return res; ZtmaV27s/  
} GaV}@Q  
&;~?\>?I  
void CCaptureDlg::AddIcon() i[ >U#5  
{ ^C92R"*Qu  
 NOTIFYICONDATA data; y` {|D*  
 data.cbSize=sizeof(NOTIFYICONDATA); bDm7$ (  
 CString tip; *Q)-"]O(k  
 tip.LoadString(IDS_ICONTIP); %'X~9Pvi  
 data.hIcon=GetIcon(0); r*dNta<  
 data.hWnd=GetSafeHwnd(); Ud7Z7?Ym  
 strcpy(data.szTip,tip); PT }J.Dwx  
 data.uCallbackMessage=IDM_SHELL; @;x*~0GZ  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9 4^b"hU  
 data.uID=98; 7&D)+{g  
 Shell_NotifyIcon(NIM_ADD,&data); CO9PQ`9+  
 ShowWindow(SW_HIDE); ?rA3<j  
 bTray=TRUE; Eg8b|!-')8  
} c&N;r|N  
L|L|liWd  
void CCaptureDlg::DeleteIcon() #kh:GAp]  
{ KMK8jJ  
 NOTIFYICONDATA data; |f/Uzd ~  
 data.cbSize=sizeof(NOTIFYICONDATA); VN (*m(b  
 data.hWnd=GetSafeHwnd(); t{QQ;'  
 data.uID=98; O #t[YP  
 Shell_NotifyIcon(NIM_DELETE,&data); vCNq2l^CW  
 ShowWindow(SW_SHOW); ;xiwyfqgE  
 SetForegroundWindow();  axDa&7%  
 ShowWindow(SW_SHOWNORMAL); |>[qC O  
 bTray=FALSE; &]GR*a  
} G0~Z|P  
H=\Tse_.  
void CCaptureDlg::OnChange() ?@7!D8$9  
{ =@S a\;  
 RegisterHotkey(); _C (fz CK  
} {}rnn$HQe  
5Zd oem  
BOOL CCaptureDlg::RegisterHotkey() FJ4,|x3v[x  
{ a+\<2NXYD  
 UpdateData(); 5 ba e-  
 UCHAR mask=0; j S[#R_  
 UCHAR key=0; fVf:voh  
 if(m_bControl) 9D Nd} rXO  
  mask|=4; (wuciKQ  
 if(m_bAlt) p*)I QM<B  
  mask|=2; c~O Lr  
 if(m_bShift) w%plK6:6  
  mask|=1; Tl'wA^~H  
  key=Key_Table[m_Key.GetCurSel()]; r>7 +&s*yk  
 if(bRegistered){ ^yqRa&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); dJ/gc"7aO  
  bRegistered=FALSE; 1KbZ6Msy  
 } ,Q3OQ[Nmh  
 cMask=mask; MBU|<tc  
 cKey=key; KO%$  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); W$2 \GPJt  
 return bRegistered; 2K{'F1"RM  
} _x1W\#  
~, E }^  
  四、小结 l U8pX$  
 @;$cX2  
  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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