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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:  *XhlIQ  
  uxU-N  
  一、实现方法 /fp8tL2Y  
1WMZ$vsQUb  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: jDY B*Y^F  
 Ol }5ry  
#pragma data_seg("shareddata") -`k>(\Q< d  
HHOOK hHook =NULL; //钩子句柄  9Bt GzI\  
UINT nHookCount =0; //挂接的程序数目 b}R_@_<u  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 TI7$J#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 X#&5?oq`  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _:m70%i  
static int KeyCount =0; FQ<x(&/NF  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 V pnk>GWD  
#pragma data_seg() h(/? 81:  
PF`uwx@zH  
  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。 AfTm#-R  
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  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: .A< HM}   
'\#q7YjaL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR IEy$2f>Ns  
cKey,UCHAR cMask) gLv+L]BnhH  
{ aA|{r/.10K  
 BOOL bAdded=FALSE; kzZgNv#G;  
 for(int index=0;index<MAX_KEY;index++){ o&1mX  
  if(hCallWnd[index]==0){ {:gx*4}q8  
   hCallWnd[index]=hWnd; HqWWWCWal  
   HotKey[index]=cKey; #AGO~#aK  
   HotKeyMask[index]=cMask; S!8<|WO^t  
   bAdded=TRUE; J=3{<Xl  
   KeyCount++; 4P3RRS  
   break; Pw<?Dw]m  
  } h.vy SwF"j  
 } uy<3B>3~.  
 return bAdded; oDA'$]UL  
} %1A8m-u]M  
//删除热键 #H~55))F  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,/+Mp  
{ #,#_"  
 BOOL bRemoved=FALSE; ;O hQBAC  
 for(int index=0;index<MAX_KEY;index++){ |D)CAQn,  
  if(hCallWnd[index]==hWnd){ $\P/ %eP  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _R\FB|_  
    hCallWnd[index]=NULL; ?C2(q6X+s  
    HotKey[index]=0; Wa^Wn +r  
    HotKeyMask[index]=0; #'&-S@/nQs  
    bRemoved=TRUE; -w"I  
    KeyCount--; W]D YfR,  
    break; %>*?uO`z[  
   } K:U=Y$x  
  } b;QgL_w  
 } ' bl9fO4v  
 return bRemoved; oT{9P?K8  
} u;t<rEC2  
1 Gr^,Ry  
jv~#'=T'  
  DLL中的钩子函数如下: F `:Q  
Eq)b=5qrG?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) wMCMrv:  
{ jI8`trD  
 BOOL bProcessed=FALSE; @:zC!dR)G  
 if(HC_ACTION==nCode) `C>h]H(  
 { pqO3(2F9  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 P}Ig6^[m\  
   switch(wParam) w]gLd  
   {  %DiQTg7V,  
    case VK_MENU: i 7]o[  
     MaskBits&=~ALTBIT; W@AHE?s6g  
     break; w@-G_-6W  
    case VK_CONTROL: Hj >fg2/  
     MaskBits&=~CTRLBIT; %h ;oi/pe  
     break; ^N<aHFF  
    case VK_SHIFT: r !!uA1!7  
     MaskBits&=~SHIFTBIT; 7%"|6dw  
     break; fh =R  
    default: //judge the key and send message .$-;`&0cZ  
     break; D/=05E%[81  
   } k$%{w\?Jf  
   for(int index=0;index<MAX_KEY;index++){ Gk5'|s  
    if(hCallWnd[index]==NULL) 2*D2jw  
     continue; F4\:9ws  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \ *CXXp`  
    { -4QZ/*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ia\Gmh  
     bProcessed=TRUE; %t&Lq }e  
    } h{mzYy} b  
   } PNAvT$0LaZ  
  } rmw}Ui"  
  else if((lParam&0xc000ffff)==1){ //有键按下 2Di~}*9&  
   switch(wParam) ByjfPb#  
   { ]B(}^N>WH  
    case VK_MENU: l#cVQ_^"  
     MaskBits|=ALTBIT; RgoF4g+@  
     break; *m "@*O'  
    case VK_CONTROL: L?u {vX  
     MaskBits|=CTRLBIT; \)28,`  
     break; auN8M.  
    case VK_SHIFT: =&pR=vl  
     MaskBits|=SHIFTBIT; DH\Ox>b=  
     break; GThGV"  
    default: //judge the key and send message ,zZH>P  
     break; waC i9  
   } %. ((4 6)  
   for(int index=0;index<MAX_KEY;index++){ ;,U@zB;\%(  
    if(hCallWnd[index]==NULL) Ds] .Ae  
     continue; Eo$l-Hl5=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T+XcEI6w  
    { 7x`$ A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); eW.qMx#:od  
     bProcessed=TRUE; E*)A!2rlK  
    } _\4r~=`HQ  
   } _~Od G  
  } PYQ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 VT>-*  
   for(int index=0;index<MAX_KEY;index++){ iJ58RY  
    if(hCallWnd[index]==NULL) i/!{k2  
     continue; ){GJgk|P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) / w dvm4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &S.p%Qe"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ;,Vdj[W$>  
   } 9hK8dJw  
  } Qq{tX  
 }  e#5WX  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); j\KOKvY)  
} v0WB.`rO  
u@D5SkT  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: X ([^i;mr  
3 a(SmM:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A["6dbvv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5Zc  
8Ie0L3d-  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: |qpm  
@I Y<i5(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8u[.s`^  
{ b7xOm"X,N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) mn1!A`$  
 { t`&mszd~T  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6R m dt  
  SaveBmp(); )`k+Oyvi<  
  return FALSE; >.39OQ#  
 } e{2Za   
 …… //其它处理及默认处理 *C)m#[#:u  
} or ~@!  
e+Mm!\ ;`  
2:.$:wS  
  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。 $m>( kd1  
hQ%X0X,  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 oVuIHb0w  
!K_<7iExI\  
  二、编程步骤 :;#^gv H  
'lC=k7@x  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; #/(L.5d[  
z 4. |N  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; WZA1nzRc  
k"dE?v\cG  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; iw(`7(*  
4u p7 :?  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ~Gg19x.#uW  
" d~M \Az  
  5、 添加代码,编译运行程序。 KPK`C0mg@k  
,iiI5FR  
三、程序代码 RionKiN  
4wS!g10}  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL pdQaVe7tRo  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) qsN}KgTjg  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ y#ON=8l  
#if _MSC_VER > 1000 i+-=I+L3  
#pragma once qk&BCkPT  
#endif // _MSC_VER > 1000 6jal5<H  
#ifndef __AFXWIN_H__ {dl@ #T u  
#error include 'stdafx.h' before including this file for PCH EA:_PBZ  
#endif s0Y7`uD^  
#include "resource.h" // main symbols 4mGRk)hk:>  
class CHookApp : public CWinApp ,({% t  
{ IOrYm  
 public: ='/#G0W  
  CHookApp(); }q/[\3  
  // Overrides 5',b~Pp  
  // ClassWizard generated virtual function overrides jN+2+P%OL  
  //{{AFX_VIRTUAL(CHookApp) up3m um  
 public: D1fUEHB}A8  
  virtual BOOL InitInstance(); H/#WpRg  
  virtual int ExitInstance(); fK4O N'[R:  
  //}}AFX_VIRTUAL Xp|$z~  
  //{{AFX_MSG(CHookApp) Df $Yn  
  // NOTE - the ClassWizard will add and remove member functions here. z_&T>ME  
  // DO NOT EDIT what you see in these blocks of generated code ! C5^N)-]"  
  //}}AFX_MSG Mm^6*L]  
  DECLARE_MESSAGE_MAP() k"`^vV[{F  
}; (yeN> x}_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); j~ qm5}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G#^6H]`[J:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G|$n,X1O(  
BOOL InitHotkey(); dfeN_0` -  
BOOL UnInit(); B<!wh  
#endif 1N8YD .3  
BGT`) WP  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. xiQd[[(sM  
#include "stdafx.h" 1$c[G}h  
#include "hook.h" JZNvuPD   
#include <windowsx.h> =?B[oq  
#ifdef _DEBUG vinn|_s%  
#define new DEBUG_NEW na/,1iI<  
#undef THIS_FILE 7 (i\?  
static char THIS_FILE[] = __FILE__; n22OPvp  
#endif jAFJ?L(  
#define MAX_KEY 100 7mS_Cz+cB  
#define CTRLBIT 0x04 -uK@2} NZ  
#define ALTBIT 0x02 u bi6=  
#define SHIFTBIT 0x01 Gc!&I+kd  
#pragma data_seg("shareddata") ?rwHkPJ{*  
HHOOK hHook =NULL; H!g9~a  
UINT nHookCount =0; 4kLTKm:G  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %t-}dC&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ]O M?e  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 6FI`0j=~  
static int KeyCount =0; iHOvCrp+X  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #mv~1tL  
#pragma data_seg() yH@2nAn  
HINSTANCE hins;  ~\+m o  
void VerifyWindow(); 'P >h2^z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) FiNB$A  
//{{AFX_MSG_MAP(CHookApp) rOq>jvy  
// NOTE - the ClassWizard will add and remove mapping macros here. $-]PD`wmY  
// DO NOT EDIT what you see in these blocks of generated code! MW.,}f  
//}}AFX_MSG_MAP !L' O")!3  
END_MESSAGE_MAP() U| 1&=8l  
{B\lk:"X  
CHookApp::CHookApp() oth=#hfU^  
{ hrnY0  
 // TODO: add construction code here, 6~(iLtd#  
 // Place all significant initialization in InitInstance ^F$iD (f  
} af2yng  
&uv7`VT  
CHookApp theApp; >:U{o!N`#_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Nxt z1  
{ W#[3a4%m  
 BOOL bProcessed=FALSE; Fm.IRu<\`  
 if(HC_ACTION==nCode) Z|Xv_Xo|4  
 { xXc3#n  
  if((lParam&0xc0000000)==0xc0000000){// Key up ,HO@bCK  
   switch(wParam) t.m C q 4{  
   { <3aW3i/jTc  
    case VK_MENU: X1~ B  
     MaskBits&=~ALTBIT; !p"Ijz5  
     break; {nmBIk2v  
    case VK_CONTROL: x\XOtjJr  
     MaskBits&=~CTRLBIT; lF1ieg"i M  
     break; 0f|nI8,z  
    case VK_SHIFT: ig,v6lqhM  
     MaskBits&=~SHIFTBIT; $t$YdleIH  
     break; xYWg1e$k  
    default: //judge the key and send message E./Gt.Na  
     break; )SFy Q  
   } C")NN s =  
   for(int index=0;index<MAX_KEY;index++){ AVv 8Hhd  
    if(hCallWnd[index]==NULL) }>u<,  
     continue; Jx1JtnyP@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c1Ta!p{%  
    { MDKiwT@#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #~88[i-6  
     bProcessed=TRUE; ,;wc$-Z!8  
    } :>otlI<0t  
   } q'awV5y  
  } E#cZM>  
  else if((lParam&0xc000ffff)==1){ //Key down #AUz.WHD  
   switch(wParam) .EQ1r7 9,  
   { k%?A=h  
    case VK_MENU: !;^TW$ G  
     MaskBits|=ALTBIT; %]i("21  
     break; u9%)_Q!14  
    case VK_CONTROL: >T~d uwS  
     MaskBits|=CTRLBIT; -( ,iwF b  
     break; VWa;;?IK  
    case VK_SHIFT: JmK[7t  
     MaskBits|=SHIFTBIT; BPzlt  
     break; -%x9^oQwY  
    default: //judge the key and send message 14v,z;HXj  
     break;  =:-x;  
   } (*2kM|  
   for(int index=0;index<MAX_KEY;index++) bfjtNF*^  
   { *z A1NH5  
    if(hCallWnd[index]==NULL) UA}oOteG  
     continue; 2r=A'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v'zf*]9  
    { 5 5T c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); v(tr:[V  
     bProcessed=TRUE; h .$3 jNU  
    } C6C7*ks  
   } "ewB4F[  
  } q9&d24|  
  if(!bProcessed){ kdry a  
   for(int index=0;index<MAX_KEY;index++){ M%8:  
    if(hCallWnd[index]==NULL) h0fbc;l  
     continue; UF00K1dbz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) FWbA+{8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _=eeZ4f  
   } aGz <Yip  
  } UE9r1g`z  
 } wN ![SM/+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); l1qWl   
} a_0G4@=T  
Wg+fT{[f|  
BOOL InitHotkey() G_] (7  
{ j.@TPf*  
 if(hHook!=NULL){ D'823,-).  
  nHookCount++; CdRgI^5  
  return TRUE; lU<n Wf  
 } ]+B#SIC;  
 else V0h  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); >@BvyZ)i  
  if(hHook!=NULL) "K8<X  
   nHookCount++; 5b9>a5j1;  
  return (hHook!=NULL); )'RLK4l  
} QDC]g.x  
BOOL UnInit() >Cjb|f3'i}  
{ W%=b|6E  
 if(nHookCount>1){ >aZ$x/U+Iw  
  nHookCount--; `8 Dgk}  
  return TRUE; y^oSVj  
 } |h,aV(Q  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 04wmN  
 if(unhooked==TRUE){ y8KJoVP iM  
  nHookCount=0; ci^+T *  
  hHook=NULL; AdtAc$@xK  
 } &r;4$7  
 return unhooked; Pxj ?W'|  
} VlVd"jW  
? 1g<] ?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  R9->.eE  
{ j/R  
 BOOL bAdded=FALSE; .TURS  
 for(int index=0;index<MAX_KEY;index++){ B%L0g.D"  
  if(hCallWnd[index]==0){ av1*i3  
   hCallWnd[index]=hWnd; dfo{ B/+  
   HotKey[index]=cKey; ;q&>cnLDR  
   HotKeyMask[index]=cMask; Iky'x[p,D  
   bAdded=TRUE; ,!f*OWnZ  
   KeyCount++; shlL(&Py  
   break; j!;?=s  
  } G!54 e  
 } PT|W{RlNl  
 return bAdded; $zTjh~ 9  
} dOFxzk,g&R  
W)F2X0D>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I hvL2 zB  
{ }XiS:  
 BOOL bRemoved=FALSE; 1_7}B4  
 for(int index=0;index<MAX_KEY;index++){ <8Qa"<4f;  
  if(hCallWnd[index]==hWnd){ _AQ :<0/#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0j1I  
    hCallWnd[index]=NULL; FxC@KZG  
    HotKey[index]=0; _wg6}3  
    HotKeyMask[index]=0; LmLV2f  
    bRemoved=TRUE; @>J4K#"  
    KeyCount--; ;fhFv&`mE  
    break; *N$#cz  
   } tLpDIA_8  
  } 4 ~17s`+  
 } E#_TX3B   
 return bRemoved; Ftm%@S?  
} !V.'~xj  
S)GWr"m-  
void VerifyWindow() f4zd(J  
{ =@m|g )  
 for(int i=0;i<MAX_KEY;i++){ .h^."+TJ  
  if(hCallWnd!=NULL){ -O_5OT4  
   if(!IsWindow(hCallWnd)){ Od'!v&  
    hCallWnd=NULL; ?0+D1w  
    HotKey=0; er}/~@JJ  
    HotKeyMask=0; un[Z$moN"  
    KeyCount--; #5T+P8  
   } <!&&Qd-d6H  
  } DL2gui3  
 } ;KmSz 1A  
} POc< G^  
~l-Q0wg  
BOOL CHookApp::InitInstance() "}|n;:r  
{ Hq^sU%  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >U9*  
 hins=AfxGetInstanceHandle(); jd=k[Yqr  
 InitHotkey(); @3{'!#/  
 return CWinApp::InitInstance(); \{n]&IjA  
} i 4eb\j  
LZyUlz  
int CHookApp::ExitInstance() >(u=/pp=:  
{ A%u-6"  
 VerifyWindow(); S 1|[}nYP  
 UnInit(); <?,o {  
 return CWinApp::ExitInstance(); *;O$=PE  
} KLs%{'[7:  
VZJs@qx:Z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |J2R w f  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (hVhzw"~  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ u|=_!$8  
#if _MSC_VER > 1000 l.lXto.6)  
#pragma once V$-IRdb  
#endif // _MSC_VER > 1000 APuG8 <R,  
B[Uvj~g  
class CCaptureDlg : public CDialog :M1S*"&:  
{ G6Z2[Ej1  
 // Construction 4_`+&  
 public: .-[UHO05^8  
  BOOL bTray; *:3flJt  
  BOOL bRegistered; y-{^L`%Mk  
  BOOL RegisterHotkey(); GLt#]I"LY  
  UCHAR cKey; j"/i+r{"E  
  UCHAR cMask; cI'&gT5  
  void DeleteIcon(); `RfhxzI  
  void AddIcon(); BULX*eOt  
  UINT nCount; ^!1mChf  
  void SaveBmp(); j|KZ HH%dc  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor /_?Ly$>'  
  // Dialog Data 6Ez}A|i  
  //{{AFX_DATA(CCaptureDlg) zMKW@  
  enum { IDD = IDD_CAPTURE_DIALOG }; 29pIO]8;  
  CComboBox m_Key; +BM(0M+  
  BOOL m_bControl; h{yqNl  
  BOOL m_bAlt; f5Zx:g  
  BOOL m_bShift; z![RC59 S  
  CString m_Path; BM1uZJ0  
  CString m_Number; "Sc_E}q |e  
  //}}AFX_DATA N|T%cdh:/  
  // ClassWizard generated virtual function overrides qp^O\>c  
  //{{AFX_VIRTUAL(CCaptureDlg) xRJv_=dT  
 public: "Q#/J)N  
  virtual BOOL PreTranslateMessage(MSG* pMsg); MV H^["AeR  
 protected: d5%A64?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "MKgU[t  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "o`N6@[w^  
  //}}AFX_VIRTUAL 8,#v7ns}#  
  // Implementation l[l('-f  
 protected: %.BbPR7?h  
  HICON m_hIcon; k(><kuJ`3  
  // Generated message map functions 2r"-X  
  //{{AFX_MSG(CCaptureDlg) 6?Rm>+2>v  
  virtual BOOL OnInitDialog(); 'u{m37ZJ  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); uY,&lX+!  
  afx_msg void OnPaint(); *n N;!*J  
  afx_msg HCURSOR OnQueryDragIcon(); oJUVW"X6  
  virtual void OnCancel(); ,+KZn}>  
  afx_msg void OnAbout(); 7Nw7a;h  
  afx_msg void OnBrowse(); ;-lk#D?n9  
  afx_msg void OnChange(); +L!-JrYHS4  
 //}}AFX_MSG IR?ICXmtx  
 DECLARE_MESSAGE_MAP() $[6:KV  
}; _LFZ0  
#endif { o=4(RC  
I`}-*% ki(  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file AM1J ^Dp  
#include "stdafx.h" "6lf~%R"  
#include "Capture.h" ^* ^te+N  
#include "CaptureDlg.h" "?EA G  
#include <windowsx.h> ]YQlCx`  
#pragma comment(lib,"hook.lib") r Ka7[/  
#ifdef _DEBUG i))S%!/r~  
#define new DEBUG_NEW cV_nYcLkz  
#undef THIS_FILE f[HhLAVGK`  
static char THIS_FILE[] = __FILE__; <bWhTNOb  
#endif Q_euNoA0  
#define IDM_SHELL WM_USER+1 vAbMU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =GTltFqI1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GNA:|x  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Rgw\qOb  
class CAboutDlg : public CDialog H*!j\|v0  
{ d%\ {,  
 public: wLPL 9  
  CAboutDlg(); F"#bCnS  
  // Dialog Data fKf5i@CvB@  
  //{{AFX_DATA(CAboutDlg) M])Y|}wv8  
  enum { IDD = IDD_ABOUTBOX }; ((\s4-   
  //}}AFX_DATA 81fpeoNO  
  // ClassWizard generated virtual function overrides ~(aQ!!H6  
  //{{AFX_VIRTUAL(CAboutDlg) suN{)"  
 protected: =LL5E}xP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &7!&]kA+  
  //}}AFX_VIRTUAL Pk7Yq:avL  
  // Implementation O7I:Y85i#O  
 protected: j8$*$|  
  //{{AFX_MSG(CAboutDlg) $U<so{xn%  
  //}}AFX_MSG b-'41d}Hn  
  DECLARE_MESSAGE_MAP() R)"Ds}1G  
}; v9( ->X'  
@Nn9- #iW  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Pdmfn8I]%  
{ :[ m;#b  
 //{{AFX_DATA_INIT(CAboutDlg) rJ4 O_a5/  
 //}}AFX_DATA_INIT Igt:M[ /  
} fD  
_{)e\n  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $*V:; -H  
{ <->Nex  
 CDialog::DoDataExchange(pDX); ~&4Hc%*IB  
 //{{AFX_DATA_MAP(CAboutDlg) bX:Y5o49  
 //}}AFX_DATA_MAP l Ot3^`  
} %g{m12  
o"->RC  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) H-~V:OCB~  
 //{{AFX_MSG_MAP(CAboutDlg) Q>] iRx>MZ  
 // No message handlers hn#i,XnY  
 //}}AFX_MSG_MAP X(U CN0#  
END_MESSAGE_MAP() %Wkvo-rOq  
.$y}}/{j?[  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Q"n*`#Yt'  
: CDialog(CCaptureDlg::IDD, pParent) ~0,Utqy  
{ 1-r# v  
 //{{AFX_DATA_INIT(CCaptureDlg) o_p#sdt"  
  m_bControl = FALSE; S H2|xn  
  m_bAlt = FALSE; <RS@,  
  m_bShift = FALSE; laG@SV  
  m_Path = _T("c:\\"); l&S2.sC  
  m_Number = _T("0 picture captured."); 1P:r=Rt/  
  nCount=0;  AC@WhL  
  bRegistered=FALSE; o7)<pfif  
  bTray=FALSE; 9bR lSb@  
 //}}AFX_DATA_INIT Xp@8 vu  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @,F8gv*  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); l)< '1dqe  
} I ugYlt  
W+-a@)sh3Q  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4HQP,  
{ hqIYo .<  
 CDialog::DoDataExchange(pDX); N=^{FZ  
 //{{AFX_DATA_MAP(CCaptureDlg) Gx ci  
  DDX_Control(pDX, IDC_KEY, m_Key); `mXbF  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); [`nY /g:  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ")'o5V  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); YhYcqE8  
  DDX_Text(pDX, IDC_PATH, m_Path); 0OO$(R*  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 3o&PVU? Q  
 //}}AFX_DATA_MAP .[%em9u  
} 8\+kfK  
D 's'LspQ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) { </MC`  
//{{AFX_MSG_MAP(CCaptureDlg) 4bLk+EY4A  
 ON_WM_SYSCOMMAND() ,_@C(O  
 ON_WM_PAINT() /4J2F9:f  
 ON_WM_QUERYDRAGICON() >Ig%|4Hw  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) eL3HX _2(  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) GO{o #}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) "| 0g 1rd  
//}}AFX_MSG_MAP 47>IT  
END_MESSAGE_MAP() /` 891( f,  
20750G  
BOOL CCaptureDlg::OnInitDialog() ?muI8b  
{ MG)wVS<d_  
 CDialog::OnInitDialog(); M>W-lp^3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,3l=44*  
 ASSERT(IDM_ABOUTBOX < 0xF000); Kk#g(YgNz  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Pw i6Ly`  
 if (pSysMenu != NULL) q"xIW0Pc  
 { 7?a@i; E<  
  CString strAboutMenu; >=Hm2daN  
  strAboutMenu.LoadString(IDS_ABOUTBOX); D%GB2-j R  
  if (!strAboutMenu.IsEmpty()) 3mKmd iD  
  { qD=o;:~Km  
   pSysMenu->AppendMenu(MF_SEPARATOR); NfvvwG;M  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); g"vg {Q  
  } )';Rb$<Qn  
 } 5$Lo]H*  
 SetIcon(m_hIcon, TRUE); // Set big icon M\O6~UFq!  
 SetIcon(m_hIcon, FALSE); // Set small icon Tap=K|b ]  
 m_Key.SetCurSel(0); g /D@/AU1u  
 RegisterHotkey(); VP[ -BK[  
 CMenu* pMenu=GetSystemMenu(FALSE); XDs )  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;AMbo`YK[  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); os6p1"_\f  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); "D0:Y(\  
 return TRUE; // return TRUE unless you set the focus to a control dzJ\+ @4  
} CA%p^4Q  
rI34K~ P  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !T;*F%G9  
{ rvO7e cR"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~>u]ow=  
 { mi9BC9W(  
  CAboutDlg dlgAbout; $ZX^JWq  
  dlgAbout.DoModal(); F F<xsoZJ  
 } KNT(lA0s  
 else "^E/N},%u5  
 { 9l) .L L  
  CDialog::OnSysCommand(nID, lParam); v Yt-Nx  
 } "{>I5<:t  
} EH))%LY1y  
?w'a^+H  
void CCaptureDlg::OnPaint() Lt ; !q b.  
{ c4QegN  
 if (IsIconic()) 59K%bz5t  
 { 0"q_c-_Bg  
  CPaintDC dc(this); // device context for painting %zj;~W;qPH  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); H.`>t  
  // Center icon in client rectangle ]-h$CJSY  
  int cxIcon = GetSystemMetrics(SM_CXICON); fFP>$  
  int cyIcon = GetSystemMetrics(SM_CYICON); T \%{zz_(  
  CRect rect; "#bL/b'{  
  GetClientRect(&rect); [P,YW|:n  
  int x = (rect.Width() - cxIcon + 1) / 2; C@+"d3  
  int y = (rect.Height() - cyIcon + 1) / 2; 3GVE/GtU  
  // Draw the icon )9'eckt  
  dc.DrawIcon(x, y, m_hIcon); %-ih$ZY  
 } l%"[857  
 else k^3 ?Z2a  
 { |O0=Q,<m  
  CDialog::OnPaint(); *?jU$&Qpj*  
 } 46(Vq|  
} i*3 4/  
iC-WQkQY  
HCURSOR CCaptureDlg::OnQueryDragIcon() XrR@cDNx{  
{ #N%ATV  
 return (HCURSOR) m_hIcon; ]D|sQPi]F  
} JqWMO!1  
"0x"X w#I  
void CCaptureDlg::OnCancel() 9_Tk8L#  
{ 1Xy{&Ut\  
 if(bTray) v%Rc wVt|  
  DeleteIcon(); A*l(0`aWq  
  CDialog::OnCancel(); v_Om3i9$E  
} K07SbL7g!p  
VYw vT0  
void CCaptureDlg::OnAbout() ERxA79  
{ +N0V8T%~z.  
 CAboutDlg dlg; _Eq*  
 dlg.DoModal(); W[S4s/)mg  
} =Ny&`X#F  
zA+&V7bvy  
void CCaptureDlg::OnBrowse() 0l#{7^e  
{ =6j4_+5mnH  
 CString str; LL,&!KW[S  
 BROWSEINFO bi; s8w7/*<d  
 char name[MAX_PATH]; -:9E+b  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); @ yJ/!9?^  
 bi.hwndOwner=GetSafeHwnd(); fdr.'aMf%  
 bi.pszDisplayName=name; #PYTFB%  
 bi.lpszTitle="Select folder"; BNU]NcA#*,  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 'Y23U7 n0B  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); hpJ[VKe  
 if(idl==NULL) MGn:Gj"d  
  return; O+Z[bis`  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); h%e}4U@X  
 str.ReleaseBuffer(); U" eP>HHp  
 m_Path=str; (QQ/I;  
 if(str.GetAt(str.GetLength()-1)!='\\') @l3L_;6a  
  m_Path+="\\"; 4>]^1J7Wz  
 UpdateData(FALSE); 3md yY\+&  
} P;jl!o$  
[ bv>(a_,  
void CCaptureDlg::SaveBmp() oQJK}9QR  
{ 9vc3&r  
 CDC dc; arf`%9M  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); {E!"^^0`  
 CBitmap bm; ) *:<3g!  
 int Width=GetSystemMetrics(SM_CXSCREEN); a&YD4DQ05  
 int Height=GetSystemMetrics(SM_CYSCREEN); }>:v  
 bm.CreateCompatibleBitmap(&dc,Width,Height); _2{i}L  
 CDC tdc; .S/W_R  
 tdc.CreateCompatibleDC(&dc); w-Zb($_  
 CBitmap*pOld=tdc.SelectObject(&bm); #BK\cIr  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6hKavzSi  
 tdc.SelectObject(pOld); ;6aTt2BQ  
 BITMAP btm; "kyy>H9)  
 bm.GetBitmap(&btm); (:3rANY|  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; |6LC>'  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;w1?EdaO  
 BITMAPINFOHEADER bih; ':yE5j  
 bih.biBitCount=btm.bmBitsPixel; Zyq h  
 bih.biClrImportant=0; MtOA A  
 bih.biClrUsed=0; fd >t9.  
 bih.biCompression=0; k1y&' 3%  
 bih.biHeight=btm.bmHeight; /$zYSP)YT  
 bih.biPlanes=1; b6!?K!imT  
 bih.biSize=sizeof(BITMAPINFOHEADER); <Q)6N!Tp^  
 bih.biSizeImage=size; (n7 v $A  
 bih.biWidth=btm.bmWidth; e"en ma\_  
 bih.biXPelsPerMeter=0; -05zcIVo  
 bih.biYPelsPerMeter=0; GRz`fO  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); `T  $lTP  
 static int filecount=0; qe!`LeT#  
 CString name; rC~hjViG.  
 name.Format("pict%04d.bmp",filecount++); ~X;r}l=k<  
 name=m_Path+name; +) 2c\1  
 BITMAPFILEHEADER bfh; * bmdY=#7  
 bfh.bfReserved1=bfh.bfReserved2=0; K1RTAFf /  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 4&/u1u 0  
 bfh.bfSize=54+size; SZJ~ktXC-V  
 bfh.bfOffBits=54; Y<Y5HI"  
 CFile bf; \XwXs 5"G  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ rly3f  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Q%4>okj,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ) ^PY-~o[  
  bf.WriteHuge(lpData,size); N3E Qq~lX  
  bf.Close(); MO)N0{.b  
  nCount++; 7 ]a6dMh  
 } 5}gcJjz  
 GlobalFreePtr(lpData); M`HXUA4  
 if(nCount==1) EOhUr=5~  
  m_Number.Format("%d picture captured.",nCount);  !pl<  
 else reLYtv  
  m_Number.Format("%d pictures captured.",nCount); p"ht|x  
  UpdateData(FALSE); FCQIfJ#  
} 8^j u=  
w#k'RuOw5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) QFIdp R.  
{ X tZ0z?  
 if(pMsg -> message == WM_KEYDOWN) g<oSTA w  
 { S*rgYe!E  
  if(pMsg -> wParam == VK_ESCAPE) W|~Lmdzj  
   return TRUE; msg&~" Z  
  if(pMsg -> wParam == VK_RETURN) +g ovnx  
   return TRUE; ~Bn#A kL  
 } " M8 j?  
 return CDialog::PreTranslateMessage(pMsg); FX)g\=ov  
} (qHI>3tpY  
T#?KY  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {y=H49  
{ oz%ZEi \bW  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ (i>VJr  
  SaveBmp(); Zeyhr\T  
  return FALSE; {c|nIwdB  
} u9}}}UN!  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dsqqq,>Q  
 CMenu pop; f33'2PYl  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $6atr-Pb  
 CMenu*pMenu=pop.GetSubMenu(0); 95^w" [}4Q  
 pMenu->SetDefaultItem(ID_EXITICON); h";G vjy  
 CPoint pt; ("o <D{A  
 GetCursorPos(&pt); Y>Q9?>}Q  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); P"W$ZX  
 if(id==ID_EXITICON) ORlz1 &hW  
  DeleteIcon(); HH+NNSRO  
 else if(id==ID_EXIT) {'G@-+K  
  OnCancel(); h;f5@#F  
 return FALSE; |//cA2@.  
} K) $.0S9d  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `ysPEwA|  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) g"]%5Ow1  
 AddIcon(); YnuC<y &p  
 return res; Q?n} ~(% &  
} -cNh5~p=  
S(mJ;C  
void CCaptureDlg::AddIcon() Ta?#o  
{ 5+:b #B  
 NOTIFYICONDATA data; wlBdA  
 data.cbSize=sizeof(NOTIFYICONDATA); 1 9a"@WB@  
 CString tip; j(6:   
 tip.LoadString(IDS_ICONTIP); P (jlWr$$  
 data.hIcon=GetIcon(0); UZMo(rG.]{  
 data.hWnd=GetSafeHwnd(); Ps Qq ^/  
 strcpy(data.szTip,tip); BIDmZU9tL  
 data.uCallbackMessage=IDM_SHELL; ^CI.F.#X|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yAR''>  
 data.uID=98; 0}hN/2}&  
 Shell_NotifyIcon(NIM_ADD,&data); fm87?RgXD  
 ShowWindow(SW_HIDE); 3G8BYP  
 bTray=TRUE; DzO0V"+H}k  
} v>.nL(VLjP  
cEi{+rfZd|  
void CCaptureDlg::DeleteIcon() |gx{un`  
{ V=k!&xN~  
 NOTIFYICONDATA data; =|S8.|r+  
 data.cbSize=sizeof(NOTIFYICONDATA); qfvd( w  
 data.hWnd=GetSafeHwnd(); kmNY ;b6Y$  
 data.uID=98; ~-lIOQ.v  
 Shell_NotifyIcon(NIM_DELETE,&data); A2 qus$  
 ShowWindow(SW_SHOW); =#n05*^  
 SetForegroundWindow(); rAIX(2@cR_  
 ShowWindow(SW_SHOWNORMAL); FyJI@PZdI-  
 bTray=FALSE; ?(>7v[=iT  
} lZV]Z3=p'0  
n_AW0i .  
void CCaptureDlg::OnChange() ?tE}89c  
{ IK(G%dDw  
 RegisterHotkey(); t*zve,?}  
} 9fMg?  
aoz+g,1 //  
BOOL CCaptureDlg::RegisterHotkey() t #MU2b  
{ f[.RAHjk  
 UpdateData(); "w= p@/C  
 UCHAR mask=0; mLPQ5`_  
 UCHAR key=0; {z|0Y&>[=  
 if(m_bControl) ?+D_*'65D  
  mask|=4; a2v UZhkR  
 if(m_bAlt) /#20`;~F)  
  mask|=2; p*_g0_^  
 if(m_bShift) 5dT-{c%w4  
  mask|=1; 6.~HbN  
  key=Key_Table[m_Key.GetCurSel()]; ].pz  
 if(bRegistered){ IpGq_TU  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); jr~ +}|@{  
  bRegistered=FALSE; 4?><x[l2{  
 } n0 _:!]k^  
 cMask=mask; >*,Zc  
 cKey=key; /$\yAOA'y  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,[,+ _A  
 return bRegistered; Y~dRvt0_w  
} knh^q;q*  
.^I,C!O#  
  四、小结 PDREwBX  
=bded(3Z  
  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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