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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: |w+N(wcJ  
  FMEW['  
  一、实现方法 ?F" mZu  
QzilivJf  
  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: yFY:D2  
l|j}Ggen  
#pragma data_seg("shareddata") yp?a7t M  
HHOOK hHook =NULL; //钩子句柄 %DhM}f  
UINT nHookCount =0; //挂接的程序数目 srQ]TYH ,  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 M37GQvo   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Nv5)A=6#AA  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey +rFAo00E|  
static int KeyCount =0; g>pvcf(  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 $_f"NE}  
#pragma data_seg() .I%`yhCW  
E+z"m|G  
  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。 O6"S=o&  
6%a:^f]  
  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: @8eQ|.q]Q  
<c.8f;1F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Ku`u%5<  
cKey,UCHAR cMask) $(fhO   
{ .K`EflN  
 BOOL bAdded=FALSE; wCgi@\  
 for(int index=0;index<MAX_KEY;index++){ {'a|$u+  
  if(hCallWnd[index]==0){ %$[#/H7=W  
   hCallWnd[index]=hWnd; .D{He9  
   HotKey[index]=cKey; hl$X.O  
   HotKeyMask[index]=cMask; ]x5+v0   
   bAdded=TRUE; G$A=Tu~  
   KeyCount++; v%@)I_6[P  
   break; e#odr{2#4u  
  } -gB9476-  
 } 0vZ49}mb)  
 return bAdded; p6X-P%s  
} !:wA\mAd  
//删除热键 l05'/duuJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *!^l ZpF  
{ enT[#f[{  
 BOOL bRemoved=FALSE; 'YvRkWf:KC  
 for(int index=0;index<MAX_KEY;index++){ p(6KJK\  
  if(hCallWnd[index]==hWnd){ D"M[}$P  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ZxB7H{  
    hCallWnd[index]=NULL; "'74GY8,  
    HotKey[index]=0; '!<gPAVTzV  
    HotKeyMask[index]=0; jSMxba]  
    bRemoved=TRUE; 8(>2+#exw  
    KeyCount--; 2 9#jKh  
    break; N?2C*|%f  
   } u'; 9zk/$  
  } ./35_Vy/O  
 } 5tl( $j  
 return bRemoved; Q 6n!u;  
} :nS$cC0x*  
u{&#Gci  
2EiE5@  
  DLL中的钩子函数如下: $X,dQ]M  
TW6F9}'f&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +~$pkxD"  
{ G^V a$ike  
 BOOL bProcessed=FALSE; %J L P=(  
 if(HC_ACTION==nCode) hsHbT^Qm  
 { 8Dkq+H93  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,lcS J^yr  
   switch(wParam) Y?ZzFd,i&  
   {  NXX/JJ+w  
    case VK_MENU: z/,&w_8,:  
     MaskBits&=~ALTBIT; L+8{%\UPd  
     break; *Wf Qi8  
    case VK_CONTROL: CE@[Z  
     MaskBits&=~CTRLBIT; }<^QW't_Y  
     break; "0 $UnR  
    case VK_SHIFT: _tRRIW"Vx"  
     MaskBits&=~SHIFTBIT; nJ}@9v F/  
     break; H[RX~Xk2E  
    default: //judge the key and send message 8n35lI ( [  
     break; C6'K)P[p  
   } e'MW"uCP}  
   for(int index=0;index<MAX_KEY;index++){ o Vpq*"  
    if(hCallWnd[index]==NULL) qTSe_Re  
     continue; m/3,;P.6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #$ 4g&8  
    { `|2g &Vn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 14DhJUV"b  
     bProcessed=TRUE; c~+KrWbZ~  
    } )=VAEQhL-  
   } L'w]O -86  
  } 1Qw_P('}  
  else if((lParam&0xc000ffff)==1){ //有键按下 55FRPNx-x  
   switch(wParam) sC A  
   { =Z ql6D  
    case VK_MENU: szCB}WY  
     MaskBits|=ALTBIT; dNf:I,<DCf  
     break; )|/%]@` N  
    case VK_CONTROL: g`C\pdX"B  
     MaskBits|=CTRLBIT; 03c8VKp'p  
     break; c\;_ jg  
    case VK_SHIFT: O-huC:zZh  
     MaskBits|=SHIFTBIT; m}7Nu  
     break; cn Oh j  
    default: //judge the key and send message A*g-pJ h  
     break; msY6zJc`  
   } c:[ ZknnCe  
   for(int index=0;index<MAX_KEY;index++){ S_TD o  
    if(hCallWnd[index]==NULL) X'U~g$"(+  
     continue; ]!j%Ad  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]T6pH7~  
    { pp{ 2[>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m%=*3gH]&  
     bProcessed=TRUE; y,/i3^y#_  
    } ]GO=8$Z  
   } l 0U23i  
  } &$ud;r#  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .TCDv4?  
   for(int index=0;index<MAX_KEY;index++){ VVDW=G  
    if(hCallWnd[index]==NULL) 5M/~ |"xk  
     continue; dI|D c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) jweX"G54R  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rsq?4+\  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ac\([F-  
   } Gt+rVJ=v  
  } 53 -O wjpx  
 } )KEW`BC5T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H'JU5nE  
} PW82 Vp.  
P) cEYk  
  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: .)SR3?   
CW2)1%1iz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +w-J;GLSy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a|jZg  
oKCv$>Y  
  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: : _tt9J  
uXk]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) w {"1V7|  
{ jwUX?`6jX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) I _gE`N  
 { R1*4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 B%tWi  
  SaveBmp(); i4]oE&G  
  return FALSE; j8nkNE]&   
 } Lx tgf2r  
 …… //其它处理及默认处理 @mmnr?_w  
} $rlrR'[H  
kIX1u<M~  
!JyY&D~`  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ]jYFrOMy4S  
SZEi+CRs0  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 tJybR"NQ  
h[&"KA  
  二、编程步骤 `<7!Rh,tS^  
Ij$C@hH  
  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"; T@Y, 7ccpd  
yYaoA/0  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; G[`1Yw$  
;1s+1G}_z  
  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; @Ns[qn;9  
6i2%EC9  
  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; L7d1)mV  
0{g*\W*+~  
  5、 添加代码,编译运行程序。 X6",Xr! {  
1`YU9?  
三、程序代码 JXM]tV  
uKd4+Km  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL L,[Q{:CS  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ]8}51y8  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ yu)^s!UY;  
#if _MSC_VER > 1000 AYgXqmH~+  
#pragma once u*TC8!n  
#endif // _MSC_VER > 1000 B\v+C!/f |  
#ifndef __AFXWIN_H__ Xl$, f`f~  
#error include 'stdafx.h' before including this file for PCH wapSpSt  
#endif }f]Y^>-Ux  
#include "resource.h" // main symbols :8!RGtn  
class CHookApp : public CWinApp 5nUJ9sqA  
{ Ml7 (<J  
 public: BHf$ %?3z,  
  CHookApp(); d&[RfZ`  
  // Overrides MUAs(M;  
  // ClassWizard generated virtual function overrides ,wwO0,"y7  
  //{{AFX_VIRTUAL(CHookApp) kQ lU.J>^  
 public: fT|A^  
  virtual BOOL InitInstance();  UXs)$  
  virtual int ExitInstance(); xC,x_:R`  
  //}}AFX_VIRTUAL xEp?|Q$  
  //{{AFX_MSG(CHookApp) Vv45w#w;  
  // NOTE - the ClassWizard will add and remove member functions here. !t^DN\\#  
  // DO NOT EDIT what you see in these blocks of generated code ! #<S*MGp!=  
  //}}AFX_MSG qh:Bc$S  
  DECLARE_MESSAGE_MAP() 2lCFE)  
}; 3f] ;y<Km  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); QYboX~g~p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =29IHL3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); MDU#V  
BOOL InitHotkey(); ?%h$deJ  
BOOL UnInit(); 68Gywk3]=u  
#endif _ i}W1i  
l2qvYNMw  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. N,c!1: b  
#include "stdafx.h" Aj)Q#Fd[  
#include "hook.h" xwf-kwF8^  
#include <windowsx.h> nUOi~cs  
#ifdef _DEBUG L%T(H<G  
#define new DEBUG_NEW .VCY|KZ  
#undef THIS_FILE pA6KiY&  
static char THIS_FILE[] = __FILE__; EUi 70h +  
#endif yQE'!m  
#define MAX_KEY 100 MQQm3VaKS  
#define CTRLBIT 0x04 ]x r0]  
#define ALTBIT 0x02 W&IG,7tr  
#define SHIFTBIT 0x01 r<ucHRO#  
#pragma data_seg("shareddata") 4"|Xndh1.  
HHOOK hHook =NULL; =/!lK&  
UINT nHookCount =0; y%SxQA +\  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey G{3 |d/;Bt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT O\ZC$XF  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey G aV&y  
static int KeyCount =0; IWQ0I&tzdx  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift k*\Bl4g  
#pragma data_seg() (4T0U5jgT  
HINSTANCE hins; 5e /YEDP  
void VerifyWindow(); x,!Dd  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 1)56ec<c  
//{{AFX_MSG_MAP(CHookApp) sD:o 2(G*  
// NOTE - the ClassWizard will add and remove mapping macros here. @ph!3<(In,  
// DO NOT EDIT what you see in these blocks of generated code! kh5a>OX  
//}}AFX_MSG_MAP #$I@V4O;#  
END_MESSAGE_MAP() D\AVZ76F1  
Uj):}xgi'  
CHookApp::CHookApp() l1)~WqhE}  
{  X0VS a{  
 // TODO: add construction code here, >u?.gJm~  
 // Place all significant initialization in InitInstance OG/b5U  
} At'CT5=  
r3l1I}  
CHookApp theApp; Nmj)TOEPW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) mGjB{Q+  
{ *M1GVhW(+  
 BOOL bProcessed=FALSE; :V(LBH0  
 if(HC_ACTION==nCode) 0O9b 7F  
 { C#kE{Qw10r  
  if((lParam&0xc0000000)==0xc0000000){// Key up ^#Ha H  
   switch(wParam) >>y`ap2%V  
   { H<(F$7Q!\  
    case VK_MENU: 68Fl/   
     MaskBits&=~ALTBIT; ]JrD@ Vy  
     break; ~U0%}Bbh  
    case VK_CONTROL: Qt>K{ >9Cf  
     MaskBits&=~CTRLBIT; l88=  
     break; K(EJ`2]:r  
    case VK_SHIFT: h2ROQKL"B  
     MaskBits&=~SHIFTBIT; b=,B Le\  
     break; C/e.BXA  
    default: //judge the key and send message gV2vwe  
     break; 2:*15RH3  
   } m,k 0 h%  
   for(int index=0;index<MAX_KEY;index++){ r5}p .  
    if(hCallWnd[index]==NULL) um.ZAS_kmc  
     continue; D&G6^ME  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .a.H aBBV  
    { rH3U;K!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~"#0rPT  
     bProcessed=TRUE; ?veeW6E(  
    } ,/\`Rc^n  
   } g8<ODU0[g  
  } o,*m,Qc  
  else if((lParam&0xc000ffff)==1){ //Key down ?zW'Hi  
   switch(wParam) A2|Bbqd  
   { g:o/^_  
    case VK_MENU: uNN/o}Qx  
     MaskBits|=ALTBIT; >jW**F  
     break; rNP;53FtZl  
    case VK_CONTROL: ZcN0:xU  
     MaskBits|=CTRLBIT; C/k#gLF`  
     break; Kh]es,$D  
    case VK_SHIFT: j3Od7bBS]  
     MaskBits|=SHIFTBIT; f%]@e9dD  
     break; WqeWjI.2  
    default: //judge the key and send message /Q1 b%C  
     break; _3`G ZeGV  
   } %;[DMc/  
   for(int index=0;index<MAX_KEY;index++) *k{Llq  
   { h`&TDB2  
    if(hCallWnd[index]==NULL) Kxsd@^E  
     continue; MntmBj-T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SZWNN#w60?  
    { 2(eO5.FYF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); JtFq/&{i  
     bProcessed=TRUE; Y&6jFT_  
    } 1)X|?ZD]F  
   } 7{#p'.nc5  
  } b~gq8,Fatb  
  if(!bProcessed){ ynsYU(  
   for(int index=0;index<MAX_KEY;index++){ TGJz[Ny  
    if(hCallWnd[index]==NULL) q,P.)\0A  
     continue; G_F_TNO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *~PB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mdc?~??8  
   } A;co1,]gR  
  } -H6 0T,o  
 } G*=HjLmZg  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !VD$uT  
} sp\6-*F  
6tH}&#K  
BOOL InitHotkey() ~VsN\!G  
{ w7 MRuAJ4  
 if(hHook!=NULL){ x1@,k=qrd  
  nHookCount++; >WZ.Dj0n  
  return TRUE; MXA?rjd0  
 } y" =?l  
 else 4@{;z4*`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); D$FTnY  
  if(hHook!=NULL) H:G``Vq;0m  
   nHookCount++; D <iG*I  
  return (hHook!=NULL); (%^C}`|EA  
} $ .tT  
BOOL UnInit() MHpGG00,  
{ [vu;B4^"  
 if(nHookCount>1){ {QEvc  
  nHookCount--; +Z"Wa0wA  
  return TRUE; dp W`e>o  
 } ^tTM 7  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }9ulHiR  
 if(unhooked==TRUE){ ) 8xbc&M  
  nHookCount=0; c]*yo  
  hHook=NULL; R~=c1bpdq  
 } 8(? &=>@  
 return unhooked; Jq^[^  
} M(> 74(}]  
zw3I(_d[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )a^&7  
{ 2m$C;j!D  
 BOOL bAdded=FALSE; OdNo2SO  
 for(int index=0;index<MAX_KEY;index++){ Y$OE[nGi%X  
  if(hCallWnd[index]==0){ M&iXdw&  
   hCallWnd[index]=hWnd; W%rUa&00  
   HotKey[index]=cKey; O]I AIM  
   HotKeyMask[index]=cMask; Ea4zC|;  
   bAdded=TRUE; ]+G .S-a  
   KeyCount++; 1#Vd)vSP  
   break; Yv1yRoDv  
  } x}ZXeqt{ {  
 } zW`Hqt;  
 return bAdded; ?<J~SF Tt  
} Da<`| l  
@Mya|zb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B}7j20:Z  
{ Ifp8oL?S;  
 BOOL bRemoved=FALSE; Lum=5zDo  
 for(int index=0;index<MAX_KEY;index++){ 1!zd#TX  
  if(hCallWnd[index]==hWnd){ )7NK+k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ F*G]Na@6D  
    hCallWnd[index]=NULL; c6b51)sQ"  
    HotKey[index]=0; X[/7vSqZ@w  
    HotKeyMask[index]=0; hGKQK ^bn  
    bRemoved=TRUE; b\\l EM>o1  
    KeyCount--; n%WjU)<  
    break; I?1 BGaAA  
   } blomB2vQ  
  } ce$ [H}rDB  
 } *lDVV,T'}w  
 return bRemoved; %S%UMA.  
} V1,p<>9  
wtbN @g0  
void VerifyWindow() rrC\4#H[??  
{ q"269W:  
 for(int i=0;i<MAX_KEY;i++){ |zRrGQY m  
  if(hCallWnd!=NULL){ 9<&*iIrM  
   if(!IsWindow(hCallWnd)){ kh}h(z^  
    hCallWnd=NULL; fbM>jK  
    HotKey=0; ShQ!'[J  
    HotKeyMask=0; +6:  
    KeyCount--; A pzC  
   } _rSwQ<38>  
  } WXo bh  
 } 5ms]Wbh)  
} +L=Xc^  
E 6#/@C,  
BOOL CHookApp::InitInstance() mdbi@ms@  
{ y.( <  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); gDJ} <^  
 hins=AfxGetInstanceHandle(); InL_JobE8r  
 InitHotkey(); %4R1rUrgt|  
 return CWinApp::InitInstance(); id,' +<  
} C`ZU.|R  
jBEW("4R  
int CHookApp::ExitInstance() o]I8Ghk>/z  
{ vMY!Z1.*  
 VerifyWindow(); D\;5{,:d  
 UnInit(); g'!"klS93  
 return CWinApp::ExitInstance(); N*[b 26  
} N=U`BhL_  
pq_U?_5Z'r  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file t!xdKX& }  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) W$7H "tg  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ oumbJ7X=L  
#if _MSC_VER > 1000 du0o4~-  
#pragma once ld"rL6  
#endif // _MSC_VER > 1000 Ne;0fk O  
7'At_oG  
class CCaptureDlg : public CDialog EajJv>X7  
{ d %FLk=]  
 // Construction W9} ,f  
 public: Cj}H'k<B  
  BOOL bTray; (:]+IjnE  
  BOOL bRegistered; %* K zP{  
  BOOL RegisterHotkey(); /:!l&1l:p  
  UCHAR cKey; K8&) kfyI  
  UCHAR cMask; !ni 1 qM  
  void DeleteIcon(); 'cu14m_  
  void AddIcon(); oP T)vN?  
  UINT nCount; ?x 0gI   
  void SaveBmp(); $v_&j E  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 48S NI  
  // Dialog Data yIr0D 6L  
  //{{AFX_DATA(CCaptureDlg) 3_9CREZCl  
  enum { IDD = IDD_CAPTURE_DIALOG }; ]H{* Z3S  
  CComboBox m_Key; O46v  
  BOOL m_bControl; 0s Jp,4Vv  
  BOOL m_bAlt; _KtV`bF  
  BOOL m_bShift; V$FZVG/@#  
  CString m_Path; NB44GP1-@  
  CString m_Number; +BO kHXk1  
  //}}AFX_DATA -awG1 4%  
  // ClassWizard generated virtual function overrides pyX:$j2R+%  
  //{{AFX_VIRTUAL(CCaptureDlg) S~H>MtX(<  
 public: EUh_`R  
  virtual BOOL PreTranslateMessage(MSG* pMsg); x|AND]^Q  
 protected: .nNZ dta&=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $y.0h(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); mJ(ElDG  
  //}}AFX_VIRTUAL 7;Lv_Y"b  
  // Implementation pUqNB_  
 protected: g'w"U9tjO  
  HICON m_hIcon; "1XTgCu\  
  // Generated message map functions +84 p/ B#  
  //{{AFX_MSG(CCaptureDlg) } 7:T? `V:  
  virtual BOOL OnInitDialog(); j[mII5e7g  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); |c2sJyj*  
  afx_msg void OnPaint(); x)Zm5&"Gg  
  afx_msg HCURSOR OnQueryDragIcon(); @(*A<2;N  
  virtual void OnCancel(); 3P>1-=  
  afx_msg void OnAbout(); Dk$<fMS,7c  
  afx_msg void OnBrowse(); @vib54G  
  afx_msg void OnChange(); ?7lW@U0  
 //}}AFX_MSG SHB'g){P  
 DECLARE_MESSAGE_MAP() av5a2r0W1  
}; >z/.8!#Q  
#endif !%t2Z QJq  
IG\Cj7{K^  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file aO(iKlZ$  
#include "stdafx.h" t,r:= '  
#include "Capture.h" z Fj|E  
#include "CaptureDlg.h" 8D@Jd  
#include <windowsx.h> /s+IstW  
#pragma comment(lib,"hook.lib") O&y`:#  
#ifdef _DEBUG L^Q;M,.c;  
#define new DEBUG_NEW `:EhYj.   
#undef THIS_FILE G,B4=[Y  
static char THIS_FILE[] = __FILE__; sSwY!";  
#endif X<$DNRN  
#define IDM_SHELL WM_USER+1 mN.[bz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~:0w%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oP4+:r)LKD  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <s\ZqL$ f  
class CAboutDlg : public CDialog h6IXD N  
{ fE)o-q6Z  
 public: E`@Z9k1 `  
  CAboutDlg(); 3O Ks?i3A  
  // Dialog Data T>b"Gj/  
  //{{AFX_DATA(CAboutDlg)  f}*:wj  
  enum { IDD = IDD_ABOUTBOX }; -&]!ig5v  
  //}}AFX_DATA l\Ww^   
  // ClassWizard generated virtual function overrides D:IG;Rsc  
  //{{AFX_VIRTUAL(CAboutDlg) M=&,+#z<V  
 protected: f)a0!U 44  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support KZ#\ >  
  //}}AFX_VIRTUAL QS\wtTXj  
  // Implementation P zM yUv  
 protected: <HN{.p{  
  //{{AFX_MSG(CAboutDlg) k.c.7%|~;  
  //}}AFX_MSG RP+)sCh  
  DECLARE_MESSAGE_MAP() Q(q&(/  
}; cPAR.h,b?  
ZvT>A#R;l~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Px*<-t|R-  
{ i'>5vU0?3  
 //{{AFX_DATA_INIT(CAboutDlg) >mR8@kob<  
 //}}AFX_DATA_INIT 34N~<-9AY  
} wYV>Qd Z  
ITn PF{N  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3Z me?o*bY  
{ f{[0;qDJ  
 CDialog::DoDataExchange(pDX); liLhvcd  
 //{{AFX_DATA_MAP(CAboutDlg) %m[ZU<v  
 //}}AFX_DATA_MAP hOj+z?  
} f^"pZS  
nu~]9~)I  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $)8,dS  
 //{{AFX_MSG_MAP(CAboutDlg) dVHbIx  
 // No message handlers R1w5,Zt  
 //}}AFX_MSG_MAP :{lP9%J-  
END_MESSAGE_MAP() +w?R4Sxjn  
g*LD}`X/-  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8 Zp^/43  
: CDialog(CCaptureDlg::IDD, pParent) Fzt?M  
{ ZE_  
 //{{AFX_DATA_INIT(CCaptureDlg) ^eO/?D8~h  
  m_bControl = FALSE; b.\xPb  
  m_bAlt = FALSE; ).(y#zJ7P  
  m_bShift = FALSE; *W^ZXhrZ  
  m_Path = _T("c:\\"); GQCdB>   
  m_Number = _T("0 picture captured."); Z(Y:  
  nCount=0; d(ypFd9z  
  bRegistered=FALSE; T{f$S  
  bTray=FALSE; Qe ip h  
 //}}AFX_DATA_INIT J,u-)9yBA<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 B {:a,V7  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0{8L^ jB/  
} %-.;sO=g  
rvd%z7Z1o  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {N/%%O.b  
{ sO 6=w%l^  
 CDialog::DoDataExchange(pDX); yrfV&C%=n  
 //{{AFX_DATA_MAP(CCaptureDlg) r@Jy*2[-Jq  
  DDX_Control(pDX, IDC_KEY, m_Key); Yb/*2iWX  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 9`Fw}yAt  
  DDX_Check(pDX, IDC_ALT, m_bAlt); s<k2vbhI  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); vPz7*w  
  DDX_Text(pDX, IDC_PATH, m_Path); x(eX.>o\  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ^IIy>  
 //}}AFX_DATA_MAP r-.@MbBm  
} ^V96l Kt/  
hEsi AbTyF  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) C}Kl!  
//{{AFX_MSG_MAP(CCaptureDlg) 7X/t2Vih@  
 ON_WM_SYSCOMMAND() #+ AQ:+  
 ON_WM_PAINT() T>L?\-  
 ON_WM_QUERYDRAGICON() lG94^|U  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) A( vdlj  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) YE{t?Y\5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *`Vmncv3  
//}}AFX_MSG_MAP >,]8iMh  
END_MESSAGE_MAP() *tEqu%N1'  
H;=Fq+  
BOOL CCaptureDlg::OnInitDialog() {A:uy  
{ DR:$urU$  
 CDialog::OnInitDialog(); qa )BbK^i  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); xLOQu.  
 ASSERT(IDM_ABOUTBOX < 0xF000); je2_ .^  
 CMenu* pSysMenu = GetSystemMenu(FALSE); pxd=a!(  
 if (pSysMenu != NULL) bSX/)')jU  
 { mOn_#2=KF  
  CString strAboutMenu; OVe0{} j  
  strAboutMenu.LoadString(IDS_ABOUTBOX); DyGls8<\!  
  if (!strAboutMenu.IsEmpty()) -YKy"   
  { ]FTi2B{}H  
   pSysMenu->AppendMenu(MF_SEPARATOR); >5L_t   
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~qGW9 4  
  } 9N}\>L)_  
 } 5Q"w{ n  
 SetIcon(m_hIcon, TRUE); // Set big icon {o)pwM"@(  
 SetIcon(m_hIcon, FALSE); // Set small icon ^9q#,6  
 m_Key.SetCurSel(0); g;8 wP5i  
 RegisterHotkey(); Em@:Qm EN  
 CMenu* pMenu=GetSystemMenu(FALSE); 9iZio3m  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); B<m0YD?>~>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 0zq'Nf?#3  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); S\&3t}_  
 return TRUE; // return TRUE unless you set the focus to a control <TRhnz  
} 5j1d=h  
NBc^(F"  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Ws@'2i\;  
{ SNH 3C1  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) L8PX SJ  
 { LtMM89u  
  CAboutDlg dlgAbout; }\7UU?@n  
  dlgAbout.DoModal(); ~!r;?38V`  
 } NSB6 2  
 else Kh(`6 f  
 { `/P/2{,~  
  CDialog::OnSysCommand(nID, lParam); Wa<<"x$  
 } i!?gga  
} Ms(xQ[#+  
gK[;"R)4o@  
void CCaptureDlg::OnPaint() tZ9i/=S  
{ $Xu3s~:S  
 if (IsIconic()) Ytlzn%  
 { $?0ch15/  
  CPaintDC dc(this); // device context for painting gtA34iw  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); UDg' s  
  // Center icon in client rectangle UlE%\L0GD&  
  int cxIcon = GetSystemMetrics(SM_CXICON); EaO@I.[  
  int cyIcon = GetSystemMetrics(SM_CYICON); 1I9v`eT4  
  CRect rect; .w.:o2L  
  GetClientRect(&rect); LJ(WU)CPc  
  int x = (rect.Width() - cxIcon + 1) / 2; = (F   
  int y = (rect.Height() - cyIcon + 1) / 2; -o6rY9\_!  
  // Draw the icon :BF? r  
  dc.DrawIcon(x, y, m_hIcon); [fa4  
 } A>yU0\A  
 else l:!L+t*}6  
 { &oS$<  
  CDialog::OnPaint(); _]>1(8_N  
 } FI$:R  
} 'RK"/ZhqE  
PX 8UVA  
HCURSOR CCaptureDlg::OnQueryDragIcon() r<e%;S  
{ 5XZ! yYB?  
 return (HCURSOR) m_hIcon; @%R<3!3v  
} %x$U(I}  
#]@HsVXh7  
void CCaptureDlg::OnCancel() ~-BF7f 6C  
{ Yv;s3>r  
 if(bTray) lrT2*$ w3  
  DeleteIcon(); )S)L9('IxT  
  CDialog::OnCancel(); tF0jH+7J-  
} _6ZjF>f  
85GIEUvH/  
void CCaptureDlg::OnAbout() &[.`xZ(|  
{ H,!xTy"Wh  
 CAboutDlg dlg; NXY jb(4:  
 dlg.DoModal(); 3yZmW$E.  
} d,"LZ>hNY*  
F1t(P 8  
void CCaptureDlg::OnBrowse() z*eBjHbF  
{ smQ^(S^  
 CString str; 2@D`^]]  
 BROWSEINFO bi; /fr>Fd  
 char name[MAX_PATH]; u]J@65~'b  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); *x"80UXL  
 bi.hwndOwner=GetSafeHwnd(); ;Ba%aaHl  
 bi.pszDisplayName=name; LwH#|8F  
 bi.lpszTitle="Select folder"; rVYoxXv  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; >1~ /:DJ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); _/s"VYFZ  
 if(idl==NULL) i6`"e[aT[o  
  return; @p+;iS1}  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); %iN>4;T8  
 str.ReleaseBuffer(); &v{Ehkr*  
 m_Path=str; zH8E,)  
 if(str.GetAt(str.GetLength()-1)!='\\') fd\RS1[  
  m_Path+="\\"; ):D"L C  
 UpdateData(FALSE); i--t ?@#  
} NK_|h %  
{m.$EoS  
void CCaptureDlg::SaveBmp() <>cS@V5j  
{ HGDrH   
 CDC dc; e3?=1ZB  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); T # \  
 CBitmap bm; "ZuuSi  
 int Width=GetSystemMetrics(SM_CXSCREEN); ji"g)d6  
 int Height=GetSystemMetrics(SM_CYSCREEN); -u2i"I730  
 bm.CreateCompatibleBitmap(&dc,Width,Height); n +~Dc[  
 CDC tdc; _kj]vbG^;  
 tdc.CreateCompatibleDC(&dc); "s*-dZO  
 CBitmap*pOld=tdc.SelectObject(&bm); J!6FlcsZm  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !'7fOP-J]  
 tdc.SelectObject(pOld); #%0V`BS7n  
 BITMAP btm; ~C.*Vc?|  
 bm.GetBitmap(&btm); 0+1wi4wy/  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 1uw#;3<L  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); E9HMhUe  
 BITMAPINFOHEADER bih; xt{'Be&Ya+  
 bih.biBitCount=btm.bmBitsPixel; +L(amq;S  
 bih.biClrImportant=0; &NE e-cb[  
 bih.biClrUsed=0; X%1TsCKMj  
 bih.biCompression=0; ~4S$+*'8  
 bih.biHeight=btm.bmHeight; rz?Cn X.t  
 bih.biPlanes=1; *Gbhk8}V'  
 bih.biSize=sizeof(BITMAPINFOHEADER); |?`5~f  
 bih.biSizeImage=size; RU)35oEV|  
 bih.biWidth=btm.bmWidth; Y?VbgOM)  
 bih.biXPelsPerMeter=0; NR{wq|"  
 bih.biYPelsPerMeter=0; `BPTcL<W  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); K"}fD;3  
 static int filecount=0; ^NW[)Dq1<  
 CString name; %\As  
 name.Format("pict%04d.bmp",filecount++); 0J)s2&H  
 name=m_Path+name; KhCP9(A=Qo  
 BITMAPFILEHEADER bfh; v<qh;2  
 bfh.bfReserved1=bfh.bfReserved2=0; '=\}dav!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); h~MV=7 lE  
 bfh.bfSize=54+size; Y Y:Bw W:  
 bfh.bfOffBits=54; "n-'?W!  
 CFile bf; S;Bk/\2  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ y}Ky<%A!P  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <#63tN9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); fCl}eXg6w  
  bf.WriteHuge(lpData,size); ]Z JoC!u  
  bf.Close(); DHidI\*gT  
  nCount++; (JhX:1  
 } N0U/u'J!g  
 GlobalFreePtr(lpData); #Ondhy%h[  
 if(nCount==1) E_HB[ 9  
  m_Number.Format("%d picture captured.",nCount); +jN}d=N-  
 else +Q*`kg'  
  m_Number.Format("%d pictures captured.",nCount); "cH RGJG#  
  UpdateData(FALSE); <P9fNBGa  
} Y4T")  
e _vsiT  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) %B3~t>  
{ [}X|&`'i  
 if(pMsg -> message == WM_KEYDOWN) ?mQ^"9^XS  
 { &v\F ah U  
  if(pMsg -> wParam == VK_ESCAPE) cpY {o^  
   return TRUE; Hh<H~s [  
  if(pMsg -> wParam == VK_RETURN) 0ju1>.p  
   return TRUE; q!c(~UVw  
 } <t%gl5}|  
 return CDialog::PreTranslateMessage(pMsg); wN 2+3LY{  
} (z?HyxRT  
]' mbHkn68  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \ /-c)  
{ rCyb3,W  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ OI R5QH  
  SaveBmp(); ]n ?x tI  
  return FALSE;  w-jElV  
} 0MQ= Rt  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ #F*|@  
 CMenu pop; o3ZN0j69|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3KLUH=)P  
 CMenu*pMenu=pop.GetSubMenu(0); z*Sm5i&)_q  
 pMenu->SetDefaultItem(ID_EXITICON); _MBa&XEM  
 CPoint pt; `h}eP[jA  
 GetCursorPos(&pt); +bjy#=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); d{ (,Gy>I  
 if(id==ID_EXITICON) W<Uu.Y{sG  
  DeleteIcon(); -H1=N  
 else if(id==ID_EXIT) @WJ;T= L  
  OnCancel(); oL4W>b )  
 return FALSE; We+rFk1ddt  
} fJ,N.O+9E  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8$Q`wRt(%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) l =^A41L_  
 AddIcon(); WxdQ^#AE  
 return res; I8*VM3  
} ;'!x  
! \] ^c  
void CCaptureDlg::AddIcon() #GsOE#*>T  
{ l,wlxh$}(  
 NOTIFYICONDATA data; tz1@s nes  
 data.cbSize=sizeof(NOTIFYICONDATA); \lL[08G  
 CString tip; !+x Q  
 tip.LoadString(IDS_ICONTIP); ?}||?2=P  
 data.hIcon=GetIcon(0); ~KK 9aV{  
 data.hWnd=GetSafeHwnd(); -luQbGcT3  
 strcpy(data.szTip,tip); ia6 jiW x  
 data.uCallbackMessage=IDM_SHELL; ,,3lH-C  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; PN}+LOD<t  
 data.uID=98; #mH@ /6,#[  
 Shell_NotifyIcon(NIM_ADD,&data); vwR_2u  
 ShowWindow(SW_HIDE); 5<?Ah+1  
 bTray=TRUE; |1tKQ0jg  
} P -m_],  
dQut8>0&  
void CCaptureDlg::DeleteIcon() VJ*1g+c  
{ |5@Ra@0  
 NOTIFYICONDATA data; lED!}h'4  
 data.cbSize=sizeof(NOTIFYICONDATA); M 8^ID #  
 data.hWnd=GetSafeHwnd(); 3CUQQ_  
 data.uID=98; I-v} DuM  
 Shell_NotifyIcon(NIM_DELETE,&data); 3F9V,zWtTi  
 ShowWindow(SW_SHOW); VA/2$5Wu  
 SetForegroundWindow(); !}*N';  
 ShowWindow(SW_SHOWNORMAL); \u=d`}E  
 bTray=FALSE; Q @}$b(b  
} 0'q4=!l  
$CcjuPsK  
void CCaptureDlg::OnChange() %wD#[<BGn>  
{  yCX5 5:  
 RegisterHotkey(); l\U Q2i  
} 'Kelq$dn#  
68%aDs  
BOOL CCaptureDlg::RegisterHotkey() *4O=4F)x  
{ Wzq W1<*`  
 UpdateData(); 5C w( 4.  
 UCHAR mask=0; egmUUuO  
 UCHAR key=0; zcpL[@B  
 if(m_bControl) dg D-"-O  
  mask|=4; mY|c7}>V;  
 if(m_bAlt) Q+CJd>B  
  mask|=2; ; :e7Z^\/k  
 if(m_bShift) ! FcGa  
  mask|=1; F)P:lvp<r  
  key=Key_Table[m_Key.GetCurSel()]; z*3b2nV  
 if(bRegistered){ o'Bd. B  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6:1`lsP  
  bRegistered=FALSE; tldT(E6  
 } fif;n[<  
 cMask=mask; UBo0c?,4  
 cKey=key; S)CsH1Q  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); '2,~'Zk  
 return bRegistered; opX07~1  
} VO#rJ1J  
AXw qN:P}  
  四、小结 /E>;O47a  
f5}afPk  
  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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