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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: =5NrkCk#V  
  7n*,L5%?]4  
  一、实现方法 /\L|F?+@  
R<VNbm;  
  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: [%(}e1T(  
P(I`^x  
#pragma data_seg("shareddata") 'P{0K?{H-4  
HHOOK hHook =NULL; //钩子句柄 Fw!wSzsk3  
UINT nHookCount =0; //挂接的程序数目 Qmxe*@{`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \|20E51B[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 `oP<mLxle  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ^|^ek  
static int KeyCount =0; n}9vAvC  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6AeX$>k+  
#pragma data_seg() "0o1M\6Z  
fj X~"U  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ZD{%0 uh  
+]|aACt]  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 'Eds0"3  
-x~h.s,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Xg:w;#r,  
cKey,UCHAR cMask) *<k8H5z8]  
{ ;K<e]RI;?  
 BOOL bAdded=FALSE; QjH;'OVt  
 for(int index=0;index<MAX_KEY;index++){ ' N$hbl  
  if(hCallWnd[index]==0){ o -tc}Aa  
   hCallWnd[index]=hWnd;  |4uH  
   HotKey[index]=cKey; \\F^uM7,  
   HotKeyMask[index]=cMask; .<zW(PW  
   bAdded=TRUE; KK; 3<kX  
   KeyCount++; y6.}h9~  
   break; K;jV"R<9  
  } pEk^;  
 } ,Y&LlB 2  
 return bAdded; Le3H!9lbc  
} ,i>u>YNZ  
//删除热键 }:u" ?v=|j  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L3:dANG  
{ b_= $W  
 BOOL bRemoved=FALSE; O+I\Q?   
 for(int index=0;index<MAX_KEY;index++){ +jzwi3B`  
  if(hCallWnd[index]==hWnd){ n:JWu0,h  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ cW B>  
    hCallWnd[index]=NULL; m1@ste;$W  
    HotKey[index]=0; dz fR ^Gv  
    HotKeyMask[index]=0; TWF6YAQ m  
    bRemoved=TRUE; Fu4LD-#  
    KeyCount--; ^lVZW8  
    break; @y%4BU&>0  
   } n4Fh*d ixg  
  } 8A/;a{   
 } <p"[jC2zF;  
 return bRemoved; /]H6'  
} "]M:+mH{]  
n%; wQ^  
c$?(zt ;  
  DLL中的钩子函数如下: tins.D  
1iWo* +5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  W7I.S5  
{ zfvMH"1  
 BOOL bProcessed=FALSE; :3`6P:^  
 if(HC_ACTION==nCode) C/Vs+aW n  
 { Q 6djfEN>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 OiI[w8  
   switch(wParam) D<}z7W-  
   {  >hqev-   
    case VK_MENU: noY~fq/U  
     MaskBits&=~ALTBIT; }{>)2S  
     break; j8p</gd  
    case VK_CONTROL: nn>1OO  
     MaskBits&=~CTRLBIT; ""cnZZ5)  
     break; +a$'<GvP  
    case VK_SHIFT: i#/,Q1yEn  
     MaskBits&=~SHIFTBIT; 2NS(;tBB0  
     break; ; MU8@?yN  
    default: //judge the key and send message C[f'1O7  
     break; Xup rl2+  
   } w,hl<=:(FB  
   for(int index=0;index<MAX_KEY;index++){ ^mWOQ*zi;  
    if(hCallWnd[index]==NULL) /Q h  
     continue; C9^[A4O@X!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3WdYDv]N}L  
    { \)Sa!XLfT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +<5q8{]Pk  
     bProcessed=TRUE; ,&>LBdG`  
    } %LBa;M  
   } S/ YT V  
  } j#^EZ/  
  else if((lParam&0xc000ffff)==1){ //有键按下 O$QtZE61  
   switch(wParam) U5X\RXy~  
   {  lJaR,,  
    case VK_MENU: j`JY3RDD  
     MaskBits|=ALTBIT; W;~ f865  
     break; (S1c6~  
    case VK_CONTROL: on?<3eED  
     MaskBits|=CTRLBIT; +/u)/ey  
     break; E`#m0Q(8  
    case VK_SHIFT: RLBeti>  
     MaskBits|=SHIFTBIT; x*}41;j}C  
     break; ~>C@n'\lv  
    default: //judge the key and send message hY$gzls4  
     break; L?~>eT  
   } 12 y=Eh  
   for(int index=0;index<MAX_KEY;index++){ Dq=&K,5;  
    if(hCallWnd[index]==NULL) Y ,1ZvUOB  
     continue; Y+il>.Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >< <(6  
    { >*DR>U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &PY~m<F  
     bProcessed=TRUE; 0$RZ~  
    } }xZR`xP(  
   } +NML>g#F~z  
  } cd_\?7  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 JbT+w \o  
   for(int index=0;index<MAX_KEY;index++){ #2*l"3.$.R  
    if(hCallWnd[index]==NULL) P2HR4`c  
     continue; CPJ8G}4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) a7?z{ssEi  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); b1rW0}A  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 tC;L A 4  
   } O~3<P3W  
  } <sU?q<MC  
 } WiDl[l"{9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ckn0I  
} m\9R;$ \  
yV{&x  
  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: G]Rb{v,r  
' i- 6JG%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gcS ?r :  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i.QS(gM  
N=Q<mj;,  
  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: 9f UD68Nob  
b02V#m;Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UB%Zq1D|t  
{ }XmrfegF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;/ wl.'GA  
 { X<:B"rPuK  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 N, `q1B  
  SaveBmp(); @zu IR0Gr)  
  return FALSE; TcW-pY<N  
 } 91I6-7# Xt  
 …… //其它处理及默认处理 Vq8G( <77  
} U.XvS''E  
G =`-w  
k2bjBAT  
  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。 O|Sbe%[*wW  
KGM9 b  
  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。 VT>TmfN(I  
&,v- AL$:Q  
  二、编程步骤 o!6~tO=%  
m1pge4*  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; )FLDCer  
PjwDth A1  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; r4YiXss  
&Hz{   
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; dh9Qo4-{  
*lZ;kW(}p  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ^pB}eh.@U  
fL xGaOT  
  5、 添加代码,编译运行程序。 W4OL{p-\/  
Uu_g_b:z  
三、程序代码 fAEgrw%Ti  
7Shau%2C  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Dx)>`yJk$;  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) { ^J/S}L]  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ V/.Na(C~  
#if _MSC_VER > 1000 1iA0+Ex(j  
#pragma once XA b%V'  
#endif // _MSC_VER > 1000 ]et ]Vkg  
#ifndef __AFXWIN_H__ :k; c|MW  
#error include 'stdafx.h' before including this file for PCH HZASIsl  
#endif >-&B#Z^,  
#include "resource.h" // main symbols I45 kPfu  
class CHookApp : public CWinApp -JKl\E  
{ lpq) vKM}^  
 public: N F$k~r  
  CHookApp(); *|gY7Av*  
  // Overrides HbI'n,+  
  // ClassWizard generated virtual function overrides 7`s* {  
  //{{AFX_VIRTUAL(CHookApp) <wH"{G3?  
 public: <USK6!-G  
  virtual BOOL InitInstance(); "U"phLX  
  virtual int ExitInstance(); x/fhlf}a}=  
  //}}AFX_VIRTUAL 1;*4y J2  
  //{{AFX_MSG(CHookApp) ;\]& k  
  // NOTE - the ClassWizard will add and remove member functions here. M2kvj'WWq  
  // DO NOT EDIT what you see in these blocks of generated code ! 'c&[kMR  
  //}}AFX_MSG bIXudE[8zq  
  DECLARE_MESSAGE_MAP() <<=.;`(/v  
}; 8A jQPDn+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); f]pHJVgFV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); AX%N:)_$|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m&P B5s\=  
BOOL InitHotkey(); P,Z K  
BOOL UnInit(); %K`th&331  
#endif bIWSNNV0F  
JpRn)e'Z  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4Wd H!z  
#include "stdafx.h" ]/9@^D}&  
#include "hook.h" x/pX?k  
#include <windowsx.h> B_uhNLd  
#ifdef _DEBUG /~(T[\E<  
#define new DEBUG_NEW J9%I&lu/  
#undef THIS_FILE {xD\w^  
static char THIS_FILE[] = __FILE__; A=Y A#0  
#endif ;tJ}*!z W  
#define MAX_KEY 100 .Ei#mG-=}&  
#define CTRLBIT 0x04 }WA =  
#define ALTBIT 0x02 !.G knDT  
#define SHIFTBIT 0x01 cMfJq}C<  
#pragma data_seg("shareddata") 3jqV/w[-  
HHOOK hHook =NULL; #0"Pd8@  
UINT nHookCount =0; e**<et.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey *g*~+B :  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT \y(ZeNs  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Z<jC,r  
static int KeyCount =0; %A3ci[$g  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 2/iBk'd  
#pragma data_seg() B:>>D/O  
HINSTANCE hins; ?NVX# t'  
void VerifyWindow(); [;C|WTYSL  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Zv0'OX~8i  
//{{AFX_MSG_MAP(CHookApp) {'-^CoR  
// NOTE - the ClassWizard will add and remove mapping macros here. | |u  
// DO NOT EDIT what you see in these blocks of generated code! %ws@t"aER  
//}}AFX_MSG_MAP BvLC%  
END_MESSAGE_MAP() ^, &'  
/HE{8b7n3F  
CHookApp::CHookApp() N79?s)l:K  
{ 3Q#Tut  
 // TODO: add construction code here, Ez/>3:;  
 // Place all significant initialization in InitInstance d4m@u$^1B  
} #AR$'TE#  
DO 0  
CHookApp theApp; c Cx_tGR"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) { .j030Q  
{ J'E?Z0  
 BOOL bProcessed=FALSE; cGSG}m@B`  
 if(HC_ACTION==nCode) o zMn8@R  
 { fB)S:f|  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7Y%Si5  
   switch(wParam) M9QYYo@  
   { to{7B7t>q  
    case VK_MENU: >g;995tG  
     MaskBits&=~ALTBIT; +MtxS l  
     break; 7<*,O&![|  
    case VK_CONTROL: JA$RY  
     MaskBits&=~CTRLBIT; S-[S?&c`  
     break; lt("yqBu  
    case VK_SHIFT: ATWa/"l(H-  
     MaskBits&=~SHIFTBIT; m++=FsiX=  
     break; FN<S agj  
    default: //judge the key and send message l`A e&nc6  
     break; 8Sk$o.Gy  
   } 8 KRo<  
   for(int index=0;index<MAX_KEY;index++){ Zg4kO;r08  
    if(hCallWnd[index]==NULL) $!vK#8-&{  
     continue; z?Cez*.h>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;LC?3.  
    { (@Kc(>(: Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); p=[SDk`  
     bProcessed=TRUE; m@W>ku  
    } Eq=j+ch7  
   } 2@!B;6*8q  
  } r+ usMF<'  
  else if((lParam&0xc000ffff)==1){ //Key down #0:rBKm,  
   switch(wParam) YCq:]  
   { eGLB,29g  
    case VK_MENU: U/A [al  
     MaskBits|=ALTBIT; 6@x^,SA  
     break; @e-2]z  
    case VK_CONTROL: #]h&GX  
     MaskBits|=CTRLBIT; iHT=ROL  
     break; q $=[v  
    case VK_SHIFT: j6E|j>@u  
     MaskBits|=SHIFTBIT; fizL_`uMqb  
     break; iEx4va-j  
    default: //judge the key and send message o;u~Yg  
     break; **.g^Pyc  
   } ( e#f  
   for(int index=0;index<MAX_KEY;index++) .JBTU>1]_n  
   { *LEI@  
    if(hCallWnd[index]==NULL) }"&Ye  
     continue; 6!C>J#T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M0t9`Z9  
    { #fDM{f0]R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9 /=+2SZ  
     bProcessed=TRUE; i}O.,iH  
    } G8.nKoHv7x  
   } G0he'BR  
  } ^vJy<  
  if(!bProcessed){ A: O"N  
   for(int index=0;index<MAX_KEY;index++){ zJ_y"bt  
    if(hCallWnd[index]==NULL) SPp|/ [i7  
     continue; _h I81Lzq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LvMA('4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); pV`/6 }  
   } '?6j.ms M  
  } ZA\;9M=  
 } xKkXr-yb`f  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8H,k0~D  
} 7b7WQ7u  
!8YA1 o  
BOOL InitHotkey() >=86*U~  
{ _K B%g_{  
 if(hHook!=NULL){ VNs3.  
  nHookCount++; AzVv- !Y  
  return TRUE; uQ%3?bx)T  
 } X6j:TF  
 else J(SGaHm@  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); * ).YU[i  
  if(hHook!=NULL) }lP`3e  
   nHookCount++; _Nh`-R%B)  
  return (hHook!=NULL); iqFC~].)  
} ^I{/j 'b&  
BOOL UnInit() X%T%N;P  
{ W^pf 1I8[  
 if(nHookCount>1){ R+El/ya:6  
  nHookCount--; Y8h 96  
  return TRUE; y[zjs^-vCv  
 } Yq'D-$@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); #8$" 84&N.  
 if(unhooked==TRUE){ +$F,!rV-s  
  nHookCount=0; S~>R}=  
  hHook=NULL; > qPP_^]  
 } j^/=.cD|  
 return unhooked; /iL*)  
} 6Fc*&7Z+  
wG73GD38  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OlgM7Vrl  
{ m;0ZV%c*j  
 BOOL bAdded=FALSE; 6ld /E  
 for(int index=0;index<MAX_KEY;index++){ j.[W] EfL~  
  if(hCallWnd[index]==0){ !="8ok+  
   hCallWnd[index]=hWnd; y&V'GhW!dd  
   HotKey[index]=cKey; P26"z))~d  
   HotKeyMask[index]=cMask; >uDC!0)R  
   bAdded=TRUE; &}t8O?!  
   KeyCount++; OuK RaZ  
   break; @)wsHW%cjz  
  } av_ +M;G  
 }  ?<T=g  
 return bAdded; =2YXh,i  
} :? s{@7  
"ji+~%`^[t  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L#%)@  
{ q7I!wD9Cff  
 BOOL bRemoved=FALSE; 7GCxd#DJ  
 for(int index=0;index<MAX_KEY;index++){ yb>R(y  
  if(hCallWnd[index]==hWnd){ ]<K"`q2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~[f`oC  
    hCallWnd[index]=NULL; 50`|#zF^#  
    HotKey[index]=0; 4K 8(H9(  
    HotKeyMask[index]=0; 57q?:M=^  
    bRemoved=TRUE; 8c>xgFWp9  
    KeyCount--; C;%dZ  
    break; S~R[*Gk_uT  
   } 7-0j8$`  
  } g+7j?vC{'  
 } y;(G%s1  
 return bRemoved; P#V}l'j(<a  
} lPrAx0m13%  
Hv2[=elc  
void VerifyWindow() cc8Q}   
{ 4aW[`  
 for(int i=0;i<MAX_KEY;i++){ $/$Hi U`.  
  if(hCallWnd!=NULL){ 6J">@+  
   if(!IsWindow(hCallWnd)){ ] g8z@r"b  
    hCallWnd=NULL; X\>/'fC$  
    HotKey=0; t,Q"Pt?  
    HotKeyMask=0; g1:%986jv  
    KeyCount--; bR;.KC3C  
   } G_zK .N   
  } ZAn9A>5_  
 } t/3HX]B_  
} $sUn'62JlU  
F)Z9Qlo  
BOOL CHookApp::InitInstance() u \<APn  
{ k3KT':*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); sXNb  
 hins=AfxGetInstanceHandle(); -8R SE4)  
 InitHotkey(); uvw1 _j?  
 return CWinApp::InitInstance(); oX'@,(6)  
} dK0H.|  
D6"d\F m<  
int CHookApp::ExitInstance() t<j_` %`8  
{ L}'^FqO[IW  
 VerifyWindow(); P]OUzI,  
 UnInit(); LFr$h`_D5  
 return CWinApp::ExitInstance(); &|#,Bsk"@  
} TKiYEh  
/8Z&Y`G  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file eKo=g|D  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;lS sy  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ H/.UDz  
#if _MSC_VER > 1000 k8l7.e*  
#pragma once -F 9 xPw  
#endif // _MSC_VER > 1000 h0HK~S#xBv  
~|N,{GaL  
class CCaptureDlg : public CDialog `U|zNizO  
{ 0cVxP)J+  
 // Construction mIPDF1= )  
 public: {+[ Ex2b$  
  BOOL bTray; j(}pUV B  
  BOOL bRegistered; WF_QhKW|k  
  BOOL RegisterHotkey(); IYHNN  
  UCHAR cKey; 2+b}FVOe\  
  UCHAR cMask; >>"@ 0tO  
  void DeleteIcon(); L"NfOST3'R  
  void AddIcon(); >yVp1Se  
  UINT nCount; cYXL3)p*Q  
  void SaveBmp(); n,LM"N:   
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor e Qk5:{[  
  // Dialog Data ?RW1%+[  
  //{{AFX_DATA(CCaptureDlg) DrbjklcUU  
  enum { IDD = IDD_CAPTURE_DIALOG }; $o9@ ?2  
  CComboBox m_Key; ReL+V  
  BOOL m_bControl; B6KG\,'|  
  BOOL m_bAlt; atmW? Z  
  BOOL m_bShift; qJ<l$Ig  
  CString m_Path; g#Ta03\  
  CString m_Number;  q*C-DiV  
  //}}AFX_DATA SLUQFoz}  
  // ClassWizard generated virtual function overrides BjA$^i|8  
  //{{AFX_VIRTUAL(CCaptureDlg) SXN]${  
 public: @1<VvW=  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 0\s&;@xKk  
 protected: ^,)nuU y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bI_MF/r''  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); @; I9e  
  //}}AFX_VIRTUAL 9\T9pjdZE  
  // Implementation M4CC&?6\  
 protected: ^dsj1#3z  
  HICON m_hIcon; ]ms+ Va_/  
  // Generated message map functions 1L!jI2~x}  
  //{{AFX_MSG(CCaptureDlg) `e?~c'a@  
  virtual BOOL OnInitDialog(); L GVy4D  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wZW\r!Us  
  afx_msg void OnPaint(); F?0Q AA  
  afx_msg HCURSOR OnQueryDragIcon(); qZ +K4H  
  virtual void OnCancel(); 4S[)5su  
  afx_msg void OnAbout(); }T AG7U*  
  afx_msg void OnBrowse(); -_eG/o=M  
  afx_msg void OnChange(); $<Y%4LI  
 //}}AFX_MSG OdNcuiLa  
 DECLARE_MESSAGE_MAP() Zm7, O8  
}; KmM:V2@A$  
#endif NV@$\ <  
m6]6 !_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file %DA`.Z9 #  
#include "stdafx.h" 9sd}Z,l  
#include "Capture.h" wO`G_!W9  
#include "CaptureDlg.h" rk@qcQR  
#include <windowsx.h> 8xG"hJR  
#pragma comment(lib,"hook.lib") [Fv,`*/sm  
#ifdef _DEBUG i}i >ho-8  
#define new DEBUG_NEW +P,ic*Kq*  
#undef THIS_FILE 4x3 _8/=  
static char THIS_FILE[] = __FILE__; @A(jo32  
#endif C5$?Y8B3  
#define IDM_SHELL WM_USER+1 -P&uY`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [9:";JSl"Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); uJeJ=7,EO  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; OdL/%Zp}  
class CAboutDlg : public CDialog VeZd\Oe  
{ +c, ^KHW  
 public: T:9M|mD  
  CAboutDlg(); bZK^q B  
  // Dialog Data Kp1 F"!  
  //{{AFX_DATA(CAboutDlg) q^n LC6q  
  enum { IDD = IDD_ABOUTBOX }; ;Ru[^p.{  
  //}}AFX_DATA Y6v#0pT  
  // ClassWizard generated virtual function overrides \Sv|yQUT  
  //{{AFX_VIRTUAL(CAboutDlg) %y*'bS  
 protected: t)g %9 k^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 25 :vc0  
  //}}AFX_VIRTUAL n%i L+I  
  // Implementation `D$^SHfyz  
 protected: o_[~{@RoR  
  //{{AFX_MSG(CAboutDlg) H@~tJ\L  
  //}}AFX_MSG gs0`nysM#  
  DECLARE_MESSAGE_MAP() $#3[Z;\  
}; Sm?|,C3V  
7,V_5M;t  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) jp@X,HES  
{ rc~)%M<[2  
 //{{AFX_DATA_INIT(CAboutDlg) ;OD-?bC  
 //}}AFX_DATA_INIT H\N} 0^ea  
} >!{8)ti  
w^YXnLLJG  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6E:H  
{ /C5py&#-I  
 CDialog::DoDataExchange(pDX); 8 Gy*BpmJn  
 //{{AFX_DATA_MAP(CAboutDlg) ;l `Ufx  
 //}}AFX_DATA_MAP @ 'N $5  
} rOO10g  
'zT7$ .L  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) a|#pl!  
 //{{AFX_MSG_MAP(CAboutDlg) 1 XJZuv,T:  
 // No message handlers M"u=)CT  
 //}}AFX_MSG_MAP [KbLEMrPba  
END_MESSAGE_MAP() NWQ7%~#k*  
T4gfQ6#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (n jTS+?  
: CDialog(CCaptureDlg::IDD, pParent) BI<9xl]a  
{ F$kiSjh9aJ  
 //{{AFX_DATA_INIT(CCaptureDlg) 8}4.x3uw  
  m_bControl = FALSE; =MD)F  
  m_bAlt = FALSE; PxvxZJf$@  
  m_bShift = FALSE; NLYf   
  m_Path = _T("c:\\"); x2aG5@<3  
  m_Number = _T("0 picture captured."); -f1}N|hy  
  nCount=0; ;X0uA?  
  bRegistered=FALSE; ;:ZD<'+N  
  bTray=FALSE; qQO*:_ezzk  
 //}}AFX_DATA_INIT \F\7*=xk  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $=  2[Q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); .h4Z\R`  
} v)nv"o[  
{#`wW`U^  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) R~hIoaiN  
{ #UI`+2w  
 CDialog::DoDataExchange(pDX); Yl$ @/xAa  
 //{{AFX_DATA_MAP(CCaptureDlg) l[m*csDk"  
  DDX_Control(pDX, IDC_KEY, m_Key); H1KXAy`&  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); R[fQ$` M  
  DDX_Check(pDX, IDC_ALT, m_bAlt); c'Z)uquvP  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); TL7qOA7^X  
  DDX_Text(pDX, IDC_PATH, m_Path); h^`@%g9 S  
  DDX_Text(pDX, IDC_NUMBER, m_Number); EM +! ph  
 //}}AFX_DATA_MAP 0b8=94a{>  
} /Dt:4{aTOC  
ui|6ih$+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) T?=]&9Y'  
//{{AFX_MSG_MAP(CCaptureDlg) d7zZ~n  
 ON_WM_SYSCOMMAND()   uk,9N  
 ON_WM_PAINT() In!^+j  
 ON_WM_QUERYDRAGICON() b].U/=Hs  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) xXmlHo<D  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I69Z'}+qz  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ]gv3|W  
//}}AFX_MSG_MAP O*,O]Q  
END_MESSAGE_MAP() e7&RZ+s#wZ  
wc"~8Ah  
BOOL CCaptureDlg::OnInitDialog() }j2t8B^&:  
{ D;+Y0B  
 CDialog::OnInitDialog(); w T_l>u  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4 2-T&7k  
 ASSERT(IDM_ABOUTBOX < 0xF000); f(!cz,y^\*  
 CMenu* pSysMenu = GetSystemMenu(FALSE); p-rQ'e  
 if (pSysMenu != NULL) [C~N#S[]  
 { ",,.xLI7  
  CString strAboutMenu; Q^l!cL| {  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Ah5o>ZtcO  
  if (!strAboutMenu.IsEmpty()) T-kHk(  
  { w-v8 P`V  
   pSysMenu->AppendMenu(MF_SEPARATOR); 1<lf o^B  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2\+N<-(F5  
  } 2.v`J=R  
 } $M4_"!  
 SetIcon(m_hIcon, TRUE); // Set big icon 2_?VR~mA#  
 SetIcon(m_hIcon, FALSE); // Set small icon }XpZgd$  
 m_Key.SetCurSel(0); ,+gtr.  
 RegisterHotkey(); K]7[|qf&   
 CMenu* pMenu=GetSystemMenu(FALSE); }S13]Kk?=  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <8Zs; >YuK  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); * 0JF|'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); w( @QRd{  
 return TRUE; // return TRUE unless you set the focus to a control Fy$ C._C$  
} ];g ~)z  
QqBQ[<_  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <pS#wTsN4%  
{ wnLpf  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) }v_|N"@  
 { 8(S|=cR  
  CAboutDlg dlgAbout; 0%IZ -])  
  dlgAbout.DoModal(); 4Sdj#w  
 } pjSM7PhQ  
 else ?G]yU  
 { #,})N*7  
  CDialog::OnSysCommand(nID, lParam); gQY`qz  
 } _ |HA\!  
} 9Q\B1Q  
_25PyG  
void CCaptureDlg::OnPaint() =>A}eR1Y   
{ BZXee>3"  
 if (IsIconic()) t 0p  
 { q1r-xsjV=  
  CPaintDC dc(this); // device context for painting ]<q!pE;t  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [" ocZ? x  
  // Center icon in client rectangle I {%( G(  
  int cxIcon = GetSystemMetrics(SM_CXICON); ~HtD]|7  
  int cyIcon = GetSystemMetrics(SM_CYICON); Olt;^> MQ  
  CRect rect; j{=}?+M  
  GetClientRect(&rect); [<f9EeziB  
  int x = (rect.Width() - cxIcon + 1) / 2; w&]$!g4  
  int y = (rect.Height() - cyIcon + 1) / 2; `7V1 F.\  
  // Draw the icon >^<;;8Xh  
  dc.DrawIcon(x, y, m_hIcon); i-dosY`81  
 } ~52'iI)Mw  
 else 7nW <kA  
 { n}4q2x"  
  CDialog::OnPaint(); 9~K+h/  
 } _ph1( !H$  
} nU#K=e =W  
Gs04)KJm<  
HCURSOR CCaptureDlg::OnQueryDragIcon() $h=v ;1"  
{ vJx( lU`Y  
 return (HCURSOR) m_hIcon; (gcy3BX;  
} |&bucG=  
WBzPSnS2  
void CCaptureDlg::OnCancel() l%yQ{loTh  
{ FS('*w&bP  
 if(bTray) < 5ULu(b&$  
  DeleteIcon(); 7v.O Lp  
  CDialog::OnCancel(); evVxzU&  
} ~Q]::  
9c{ ~$zJW  
void CCaptureDlg::OnAbout() o{mVXidE  
{ #D >:'ezm  
 CAboutDlg dlg; UCTc$3  
 dlg.DoModal(); 'S#^ 70kt  
} n2[h`zm1{B  
2IkyC`  
void CCaptureDlg::OnBrowse() }ZiJHj'<  
{ eV;nTj  
 CString str; Q yQ[H  
 BROWSEINFO bi; \y7Gi}nI  
 char name[MAX_PATH]; c<q~T >0k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); N7X(gh2h  
 bi.hwndOwner=GetSafeHwnd(); ,hT**(W  
 bi.pszDisplayName=name; xz +;1JAL3  
 bi.lpszTitle="Select folder"; {q~N$"#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; tejpY  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 'Ir   
 if(idl==NULL) (4rHy*6  
  return; KyqP@ {  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); AF{@lDa1h  
 str.ReleaseBuffer(); z> N73 u  
 m_Path=str; Uqly|FS &n  
 if(str.GetAt(str.GetLength()-1)!='\\') "tA.`*  
  m_Path+="\\"; Pt6d5EIG  
 UpdateData(FALSE); _,p/2m-Pj  
} 3 rLc\rK  
N5xI;UV9'  
void CCaptureDlg::SaveBmp() dLR[<@E  
{ FL0yRF5  
 CDC dc; rK'O 85)eU  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ( "<4Ry.u  
 CBitmap bm; Fa#5a'}I  
 int Width=GetSystemMetrics(SM_CXSCREEN); $lUz!m jG  
 int Height=GetSystemMetrics(SM_CYSCREEN); #wh[F"zX  
 bm.CreateCompatibleBitmap(&dc,Width,Height); a 5w E{K  
 CDC tdc; kpQN>XV#  
 tdc.CreateCompatibleDC(&dc); OE}c$!@  
 CBitmap*pOld=tdc.SelectObject(&bm); ,wyEo>>4)  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); wDBU+Z  
 tdc.SelectObject(pOld); D<*) ^^  
 BITMAP btm; Q7mikg=1-  
 bm.GetBitmap(&btm); ZA'0 q  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -KqMSf&9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 'loko#6  
 BITMAPINFOHEADER bih; /c7jL4oD  
 bih.biBitCount=btm.bmBitsPixel; Gxt6]+r  
 bih.biClrImportant=0; !4YmaijeN  
 bih.biClrUsed=0; X7MA>j3m  
 bih.biCompression=0; T@n};,SQ  
 bih.biHeight=btm.bmHeight; ;YBk.} %  
 bih.biPlanes=1; 9h6siK(F  
 bih.biSize=sizeof(BITMAPINFOHEADER);  4NIb_E0  
 bih.biSizeImage=size; aq(i^d  
 bih.biWidth=btm.bmWidth; Kzwe36O;?  
 bih.biXPelsPerMeter=0; yv$hIU2X  
 bih.biYPelsPerMeter=0; $5Rx>$~+d  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); B? XK;*])  
 static int filecount=0; oS_YQOoD  
 CString name; @?t+O'&  
 name.Format("pict%04d.bmp",filecount++); K>-01AGHL  
 name=m_Path+name; 0rAuK7  
 BITMAPFILEHEADER bfh; Jl$ X3wE  
 bfh.bfReserved1=bfh.bfReserved2=0; N4WX}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); A 0;ng2&  
 bfh.bfSize=54+size; e_1L J  
 bfh.bfOffBits=54; 5mm&l+N)  
 CFile bf; ~O3VX75f  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ SkU9iW(k  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); \e%%ik,<  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]BmnE#n&  
  bf.WriteHuge(lpData,size); CUaL  
  bf.Close(); $vn x)#r3  
  nCount++; h6;zAM}  
 } W"tGCnd  
 GlobalFreePtr(lpData); #smfOGSd  
 if(nCount==1) 58o&Dv6?  
  m_Number.Format("%d picture captured.",nCount); U.N& ~S  
 else Xl>ZnI];  
  m_Number.Format("%d pictures captured.",nCount); -L wz T  
  UpdateData(FALSE); w@a|_?  
} k<rJm P{  
6O*lZNN  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >.hDt9@4  
{ M{YN^ Kk  
 if(pMsg -> message == WM_KEYDOWN) (/!zHq  
 { !d95gq<=>  
  if(pMsg -> wParam == VK_ESCAPE) \|Y_,fi  
   return TRUE; 5wv7]F<  
  if(pMsg -> wParam == VK_RETURN) !'Hd:oD<  
   return TRUE; =RofC9,  
 } m RC   
 return CDialog::PreTranslateMessage(pMsg); \[wbJ  
} Ghar hJ>v  
d8p5a C+E  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qGP}  
{ I(Vg  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j%8 1q  
  SaveBmp(); l}D /1~d  
  return FALSE; S&c5Q*->[  
} " #w%sG^_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ +IlQZwm~  
 CMenu pop; -<(RYMk*)  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]y"=/Nu-Ja  
 CMenu*pMenu=pop.GetSubMenu(0); .P ??N  
 pMenu->SetDefaultItem(ID_EXITICON); 8,&Y\b`..  
 CPoint pt;  C8} ;,  
 GetCursorPos(&pt); | vxmgX)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); bfK4ps}m*  
 if(id==ID_EXITICON) .k|\xR  
  DeleteIcon(); FRayB VHL  
 else if(id==ID_EXIT) OLqynY  
  OnCancel(); ^szi[Cj  
 return FALSE; P5lk3Zg '  
} Iq 0ew  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1*trtb4F  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) g3(LDqB'.  
 AddIcon(); 6Q]JY,+  
 return res; rshUF  
} 6LabFX@{&  
7'|aEH  
void CCaptureDlg::AddIcon() t8*NldC  
{ }?sC1]-j&  
 NOTIFYICONDATA data; _SU6Bd/>  
 data.cbSize=sizeof(NOTIFYICONDATA); BteeQ&A|~  
 CString tip; u hB V)Qg  
 tip.LoadString(IDS_ICONTIP); X<g }F[Y  
 data.hIcon=GetIcon(0); `X<a(5[vV3  
 data.hWnd=GetSafeHwnd(); M6].V*k'2  
 strcpy(data.szTip,tip); .sKfwcYu4  
 data.uCallbackMessage=IDM_SHELL; "ZFH_5<  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #WAX&<m  
 data.uID=98; a TPq1u  
 Shell_NotifyIcon(NIM_ADD,&data); v3<q_J'qT  
 ShowWindow(SW_HIDE); ^Ww5@  
 bTray=TRUE; g1Osd7\o  
} s3 VD6xi7  
2)-4?uz~  
void CCaptureDlg::DeleteIcon() ?MS!t6  
{ {P )O#  
 NOTIFYICONDATA data; YoWXHg!U  
 data.cbSize=sizeof(NOTIFYICONDATA); x1Z*R+|>2  
 data.hWnd=GetSafeHwnd(); DD`DU^o<  
 data.uID=98; Gz(l~!n~a  
 Shell_NotifyIcon(NIM_DELETE,&data); ^$[iLX  
 ShowWindow(SW_SHOW); YWL7.Y>%5  
 SetForegroundWindow(); 8i)9ho<  
 ShowWindow(SW_SHOWNORMAL); z|\n^ZK=  
 bTray=FALSE; #er% q:  
} ^1_CS*  
"akAGa!V+  
void CCaptureDlg::OnChange() Zx7aae_{  
{ c6SXz%'k  
 RegisterHotkey(); jINI<[v[  
} #L57d  
nC)"% Sa  
BOOL CCaptureDlg::RegisterHotkey() WuTkYiF  
{ L$y~\1-  
 UpdateData(); z";(0%  
 UCHAR mask=0; W{~ y< `D  
 UCHAR key=0; s^Xs*T@~h  
 if(m_bControl) t]?{"O1rC  
  mask|=4; ]bYmM@  
 if(m_bAlt) g1(5QWb  
  mask|=2; ):y^g:  
 if(m_bShift) vG\ b `  
  mask|=1; $9:  @M.  
  key=Key_Table[m_Key.GetCurSel()]; D|^N9lDaQ  
 if(bRegistered){ [a?bv7Kz  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); A;o({9VH`Z  
  bRegistered=FALSE; -<M+$hK\  
 } 7xYz9r)w`  
 cMask=mask; )g }G{9M^  
 cKey=key; c c/nzB  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [70 5[  
 return bRegistered; 1/K1e$r  
} 2<:dA >1  
!YZKa-  
  四、小结 Z'Pe%}3  
#rNc+  
  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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