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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: R2W_/fsG  
  *, K \A  
  一、实现方法 mA @+4&  
 Jx w<*  
  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: cO&9(.d  
Bn q\Gg  
#pragma data_seg("shareddata") <vDm(-i3  
HHOOK hHook =NULL; //钩子句柄 w}q"y+=Z:  
UINT nHookCount =0; //挂接的程序数目 IOl"Xgn5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 'O9=*L) X  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 t@M] ec  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey iZk``5tPE  
static int KeyCount =0; K~T\q_ZPZ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #" -^;Z  
#pragma data_seg() &S]v+wF  
MGDv4cFE.  
  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。 TVwYFX  
ZQA C &:  
  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: Dj"=kL0  
vW3ZuB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR !H\GHA'DO]  
cKey,UCHAR cMask) vI}S6-"<  
{ . *xq =  
 BOOL bAdded=FALSE; 0u2uYiE-l  
 for(int index=0;index<MAX_KEY;index++){ HYmXPpse  
  if(hCallWnd[index]==0){ hATy 3*4  
   hCallWnd[index]=hWnd; |LH*)GrD*t  
   HotKey[index]=cKey; uf] $@6)  
   HotKeyMask[index]=cMask; vyGLn  
   bAdded=TRUE; ,5*xE\9G  
   KeyCount++; uiA:(2AQ  
   break; 5T#D5Z<m  
  } RQNi&zX/  
 } 4LJ}>e  
 return bAdded; X{9o8 *V  
} j],.`Y  
//删除热键 tta0sJ8 i  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tdF[2@?+  
{ F:GKnbY  
 BOOL bRemoved=FALSE; ~la04wR28  
 for(int index=0;index<MAX_KEY;index++){ N\p]+[6  
  if(hCallWnd[index]==hWnd){ ,8nZzVo  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ h xJgxM  
    hCallWnd[index]=NULL; 7#qL9+G  
    HotKey[index]=0; 2!?z%s-S  
    HotKeyMask[index]=0; HWOs@ !cL  
    bRemoved=TRUE; $IZZ`Z]B  
    KeyCount--; 6'! {0 5=m  
    break; fhx:EZ:~  
   } h ]$?~YE  
  } ;I71_>m  
 } wN hR(M7  
 return bRemoved; _5 tqO5'  
} v1g5(  
yUwgRj  
q'@Ei4  
  DLL中的钩子函数如下: )Hm[j)YI  
$= xQX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .|`=mx  
{ w?W e|x3  
 BOOL bProcessed=FALSE; 810<1NP  
 if(HC_ACTION==nCode) s Xk?.A_D  
 { Cy:`pYxhd  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 H-KwkH`L4  
   switch(wParam) U]U)'  
   {  Zbh]SF{3F  
    case VK_MENU: Rue|<d1  
     MaskBits&=~ALTBIT; |aAWW d5  
     break; *@n3>$  
    case VK_CONTROL: pQ^,.[[  
     MaskBits&=~CTRLBIT; 7r[ %| :  
     break; 3H}~eEg,  
    case VK_SHIFT: jl-Aos"/  
     MaskBits&=~SHIFTBIT; yki51rOI*  
     break; xZ=FH>Y6'  
    default: //judge the key and send message bZay/ Zkj  
     break; &}6ES{Nr8  
   } >{qK ]xj  
   for(int index=0;index<MAX_KEY;index++){ i,Wm{+H-O  
    if(hCallWnd[index]==NULL) /\a]S:V-j  
     continue; %*6oUb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &*]{"^  
    { :e<`U~8m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); tGO[A#9a  
     bProcessed=TRUE; `KJYm|@i  
    } ^c0$pqZ}r  
   } P`3s\8[Q  
  } P-OPv%jyi  
  else if((lParam&0xc000ffff)==1){ //有键按下 [X">vaa  
   switch(wParam) =Kt9,d08x  
   { 9oz(=R  
    case VK_MENU: L740s[,`o#  
     MaskBits|=ALTBIT; zdjM%l);  
     break; 3q|cZQK!1  
    case VK_CONTROL: [71#@^ye  
     MaskBits|=CTRLBIT; `zzKD2y  
     break; XHZ: mLf  
    case VK_SHIFT: !&a;P,_Fb  
     MaskBits|=SHIFTBIT; }6CXJ+-UR  
     break; Dz8:; $/  
    default: //judge the key and send message ~C"k$;(n  
     break; 5Q$r@&qp  
   } 1] %W\RHxo  
   for(int index=0;index<MAX_KEY;index++){ 5@UC c  
    if(hCallWnd[index]==NULL) uh5Pn#da^  
     continue; K(Q]&&<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <K,% y(]  
    { O@r.>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); zY1s7/$ i  
     bProcessed=TRUE; =CKuiO.j  
    } 5i4V5N>3  
   } 77xq/c[)  
  } i[2bmd!H  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 s^g.42?u  
   for(int index=0;index<MAX_KEY;index++){ .L^pMU+!^  
    if(hCallWnd[index]==NULL) bCA2ik  
     continue; Xb=2/\}|f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Tf#2"(!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mWli}j#  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 5oU`[&=Ob  
   } SLdN.4idK  
  } crJ7pe9  
 } p<=(GY-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $(@o$%d  
} gV"qV   
<G~} N  
  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: t;.^K\S4  
UCn*UX  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VqK%^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); + mfe*'AU  
RgB6:f,  
  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: ~A`&/U  
N5 SLF4R1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) eg"=H50  
{ h4CTTe)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) w]>"'o{{  
 { M}Nb|V09  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 f^W[; w  
  SaveBmp(); kmm  
  return FALSE; nG"tO'J6  
 } cGgM8  
 …… //其它处理及默认处理 tcBC!_vF  
} 0a"igH}  
"?apgx 6  
yicO!:bM  
  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。 q} ]'Q -  
zRwb"  
  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。 tHrK~|  
}JRP,YNh  
  二、编程步骤 [Q4_WKI0T  
C=fsJ=a5;  
  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"; weNzYMf%  
iM:yX=>a  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; TT'Ofvdc  
:w@F?:C  
  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; OnZF6yfN=3  
`AWy!}8  
  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; y Wpi|  
q`XW5VV{K  
  5、 添加代码,编译运行程序。 7FAIew\r  
 l B1#  
三、程序代码 p6`Pp"J_tr  
z< z*Wz  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 3pvYi<<D'  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !X^Hi=aV  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ :6XguU  
#if _MSC_VER > 1000 /\na;GI$  
#pragma once M70c{s`w5  
#endif // _MSC_VER > 1000 94\t1fE  
#ifndef __AFXWIN_H__ 2ck 4C/ h  
#error include 'stdafx.h' before including this file for PCH pX@Si3G`  
#endif m23+kj)+VY  
#include "resource.h" // main symbols g3Z:{@m  
class CHookApp : public CWinApp l :/&E 6 9  
{ ,Du@2w3Cq  
 public: g%ubvu2t]  
  CHookApp(); !)N|J$FU  
  // Overrides 8O>}k  
  // ClassWizard generated virtual function overrides a Sf/4\  
  //{{AFX_VIRTUAL(CHookApp) W4(v6>5l  
 public: #O"  
  virtual BOOL InitInstance(); Z1M>-[j)  
  virtual int ExitInstance(); "NDxgJ%J35  
  //}}AFX_VIRTUAL *I0Tbc O  
  //{{AFX_MSG(CHookApp) n|Pr/ddL   
  // NOTE - the ClassWizard will add and remove member functions here. [QT 1Ju64  
  // DO NOT EDIT what you see in these blocks of generated code ! Z`Pd2VRp  
  //}}AFX_MSG j Fma|y  
  DECLARE_MESSAGE_MAP() ~4\,&HH  
}; 'B_\TU0 O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); <\" .L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SVagT'BB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); scW'AJJq  
BOOL InitHotkey(); Zk&h:c  
BOOL UnInit(); -?<4Og[^  
#endif z>;$im   
[|[>}z:  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. f6!D L<  
#include "stdafx.h" HG%Z "d  
#include "hook.h" n-o3  
#include <windowsx.h> ;gMgj$mI  
#ifdef _DEBUG Rrg8{DZhv  
#define new DEBUG_NEW HSN8O@dy  
#undef THIS_FILE [3N[i(Wlk  
static char THIS_FILE[] = __FILE__; B@O@1?c[  
#endif vMla'5|l  
#define MAX_KEY 100 e8}Ezy"^  
#define CTRLBIT 0x04 y{d^?(-  
#define ALTBIT 0x02 ,Q/Ac{C  
#define SHIFTBIT 0x01 :B|Dr v  
#pragma data_seg("shareddata") @ {#mpDX  
HHOOK hHook =NULL; f[sF:f(zI  
UINT nHookCount =0; 4=Gph  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 6Pn8f  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  U47}QDh  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey vyI%3+N@  
static int KeyCount =0; ,RxYd6  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift pFsc}R/0/8  
#pragma data_seg() ir16   
HINSTANCE hins; }LP!)|E  
void VerifyWindow(); zf[`~g  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8FkFM^\1L  
//{{AFX_MSG_MAP(CHookApp) a%BeqSZh  
// NOTE - the ClassWizard will add and remove mapping macros here. -n5 B)uw=  
// DO NOT EDIT what you see in these blocks of generated code! }-@4vl x$  
//}}AFX_MSG_MAP ' GG=Ebt  
END_MESSAGE_MAP() G{9X)|d  
l4y{m#/  
CHookApp::CHookApp() pS[KBQ"F  
{ |o<8}Nja6  
 // TODO: add construction code here, 7=XL!:P  
 // Place all significant initialization in InitInstance %7hB&[ 5  
} c+dg_*^  
<#+44>h  
CHookApp theApp; otJ!UfpR8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ($nrqAv4  
{ ~8T(>!hE1h  
 BOOL bProcessed=FALSE; ,8MLoZ _  
 if(HC_ACTION==nCode) SC &~s$P;  
 { jJZgK$5+  
  if((lParam&0xc0000000)==0xc0000000){// Key up C'A]i5  
   switch(wParam) 1 " #*)MF  
   { *e#<n_%R  
    case VK_MENU: 1w(JEqY3h:  
     MaskBits&=~ALTBIT; xI*#(!x"G  
     break; DI|:p!Nx  
    case VK_CONTROL: L,,*gK  
     MaskBits&=~CTRLBIT; ]aryV?!6  
     break; JUAS$Y  
    case VK_SHIFT: C0*@0~8$9  
     MaskBits&=~SHIFTBIT; hsKmnH@#  
     break; fV:4#j  
    default: //judge the key and send message D4JLtB'=  
     break; JRMM?y  
   } 7OCwG~_^  
   for(int index=0;index<MAX_KEY;index++){ ;Xvp6.:  
    if(hCallWnd[index]==NULL) _c$9eAe  
     continue;  '1^B +m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X^9d/}uTa  
    { fq[;%cr4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +>~?m*$  
     bProcessed=TRUE; YW \0k5[  
    } R%D'`*+  
   } U$dh1;  
  } h].~#*  
  else if((lParam&0xc000ffff)==1){ //Key down COzyG.R.  
   switch(wParam) `(6r3f~XJ  
   { G rmzkNlN  
    case VK_MENU: kql0J|P?  
     MaskBits|=ALTBIT; YXurYwV  
     break; Em 6Qe  
    case VK_CONTROL: bI)u/  
     MaskBits|=CTRLBIT; r7]zQIE  
     break; c#IYFTz  
    case VK_SHIFT: b1XRC`Gy  
     MaskBits|=SHIFTBIT; r|e-<t4.9L  
     break; D]a<4a 18  
    default: //judge the key and send message !\8  ;d8  
     break; VQ5nq'{v  
   } D?yG+%&9  
   for(int index=0;index<MAX_KEY;index++) |t iUej  
   { %1 vsN-O}8  
    if(hCallWnd[index]==NULL) C;QAT  
     continue; jn >d*9u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^.k |SK`U  
    { BBG3OAyg_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Io4(f  
     bProcessed=TRUE; @yXfBML?]  
    } ofYlR|  
   } p Dx-2:}  
  } e!Y0-=?nf#  
  if(!bProcessed){ B+C);WQ,  
   for(int index=0;index<MAX_KEY;index++){ 8}X5o]Mv  
    if(hCallWnd[index]==NULL) uXDq~`S  
     continue; g,o?q:FL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) '0y9MXRT  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "<_0A f]  
   } iRg7*MQu  
  } =[\s8XH,  
 } A1P K  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %>-@K|:gS  
} N>(g?A; Z+  
[gy*`@w  
BOOL InitHotkey() T,xPSN2A*  
{ *_E|@y  
 if(hHook!=NULL){ x3qW0K8  
  nHookCount++; pj4!:{.;  
  return TRUE; >9RD_QG7  
 } {u1V|q  
 else aL J(?8M@  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); )ZrS{vY  
  if(hHook!=NULL) :=%0Mb:  
   nHookCount++; o?1;<gs  
  return (hHook!=NULL); Xc"&0v%;#  
} [aI]y =v  
BOOL UnInit() lrf v+  
{ k+I}PuG  
 if(nHookCount>1){ l]~n3IK"  
  nHookCount--; 5JEbe   
  return TRUE; DvvT?K  
 } lEHzyh}2k  
 BOOL unhooked = UnhookWindowsHookEx(hHook); :l|%17N  
 if(unhooked==TRUE){ '47P|t  
  nHookCount=0; 2I*;A5$N1  
  hHook=NULL; fDG0BNLY  
 } lds- T  
 return unhooked; 8-y{a.,u.  
} x(<(t: ?o  
%IC73?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =+ t^f  
{ s"Pf+aTW  
 BOOL bAdded=FALSE; n,B,"\fw  
 for(int index=0;index<MAX_KEY;index++){ "#(T  
  if(hCallWnd[index]==0){ }y9mNT  
   hCallWnd[index]=hWnd; ^Y-]*8;]  
   HotKey[index]=cKey; T \w?$ s  
   HotKeyMask[index]=cMask; []a[v%PkG  
   bAdded=TRUE; Ag F,aZU  
   KeyCount++; ~"UV]Udn  
   break; (JM4R8fR&  
  } %tG*C,l]  
 } P!"&%d  
 return bAdded; hXqD<?  
} V& C/Z}\  
u%~igt@x  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +cD!1IT:  
{ 6N)!aT9eo  
 BOOL bRemoved=FALSE; 3O7!`Nm@  
 for(int index=0;index<MAX_KEY;index++){ $Of0n` e  
  if(hCallWnd[index]==hWnd){ dt2$`X18  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (@iMLuewK  
    hCallWnd[index]=NULL; ^"J8r W6[  
    HotKey[index]=0; L%>n>w  
    HotKeyMask[index]=0; R(n^)^?  
    bRemoved=TRUE; E ;<l(.Ar  
    KeyCount--;  o x+ 3U  
    break; <7-J0btV  
   } f>aRkTHf  
  } 4)1s M=u  
 } +la2n(CAK  
 return bRemoved; pv&y91  
} B<C*  
KiJT!moB  
void VerifyWindow() O(+phRwJ  
{ }:Z#}8  
 for(int i=0;i<MAX_KEY;i++){ H,N)4;F<c  
  if(hCallWnd!=NULL){ =m5SK5vLKT  
   if(!IsWindow(hCallWnd)){ gn3jy^5  
    hCallWnd=NULL; Nbp!teH6  
    HotKey=0; Mi]L]-L  
    HotKeyMask=0; 1KjU ] r2  
    KeyCount--; )Tk1 QHU  
   } 6;|n]m\Vd  
  } ]O]GeAGC2  
 } ;vt8R=T  
} C+|b1/N-  
T0&f8  
BOOL CHookApp::InitInstance() @xB*KyUW  
{ sJ]taY ou  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); UKM2AZ0lb  
 hins=AfxGetInstanceHandle(); A45A:hqs  
 InitHotkey(); ar:+;.n  
 return CWinApp::InitInstance(); byv[yGa`  
} !"eIV@7  
WJ_IuX51'  
int CHookApp::ExitInstance() :]J Ye*  
{ ?(R]9.5S  
 VerifyWindow(); JGuN:c$  
 UnInit(); H"qOSf{  
 return CWinApp::ExitInstance(); @-+Q# Zz`  
} rL}YLR  
92^w8Z.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file -YsLd 9^4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Nj?/J47?,  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ kYLM&&h  
#if _MSC_VER > 1000 8>7& E-  
#pragma once 9;veuX#(  
#endif // _MSC_VER > 1000 1AU#%wIEP  
cq$i  
class CCaptureDlg : public CDialog QcgfBsv96  
{  |jM4E$  
 // Construction up'Tit  
 public: );FJx~b  
  BOOL bTray; lGVEpCS}  
  BOOL bRegistered; L(U"U#QZ  
  BOOL RegisterHotkey(); F4K0) ;  
  UCHAR cKey; /Ml.}7&  
  UCHAR cMask; v'e[GB 0  
  void DeleteIcon(); ;X?mmv'  
  void AddIcon(); .-<k>9S7_  
  UINT nCount; IKi5 v~bE  
  void SaveBmp(); B9wPU1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 8cA~R-  
  // Dialog Data X=> =5'  
  //{{AFX_DATA(CCaptureDlg) %*\es7m}  
  enum { IDD = IDD_CAPTURE_DIALOG }; S%Us5`sd  
  CComboBox m_Key; Z ,EvQ8i  
  BOOL m_bControl; / 4lvP  
  BOOL m_bAlt; g H G  
  BOOL m_bShift; f"St&q>[s  
  CString m_Path; O)"gS!,  
  CString m_Number; 9D4NX<_  
  //}}AFX_DATA J&T.(  
  // ClassWizard generated virtual function overrides Mb]rY>B4  
  //{{AFX_VIRTUAL(CCaptureDlg) ahPoEh  
 public: ?.YOI.U^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); sq;s]@~  
 protected: Ybn`3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3"P }n  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5sb\r,kW  
  //}}AFX_VIRTUAL Ry|!pV  
  // Implementation 3K_A<j:  
 protected: e/^=U7:io  
  HICON m_hIcon; #es9d3 ~\  
  // Generated message map functions SXy=<%ed  
  //{{AFX_MSG(CCaptureDlg) F}=aBV|-  
  virtual BOOL OnInitDialog(); ##4GK08!  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 'z$Q rFW  
  afx_msg void OnPaint(); Jm42b4  
  afx_msg HCURSOR OnQueryDragIcon(); bP^Je&nS*  
  virtual void OnCancel(); NM06QzE  
  afx_msg void OnAbout(); ZfB " E  
  afx_msg void OnBrowse(); YJo["Q  
  afx_msg void OnChange(); E>}4$q[r  
 //}}AFX_MSG X_7UJ jFw"  
 DECLARE_MESSAGE_MAP() 3}/&w\$  
}; D#o}cC.  
#endif 2/0v B>  
n-%s8aaVf  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file o";Z$tAJkC  
#include "stdafx.h" zF`c8Tsx])  
#include "Capture.h" rf$X>M=G  
#include "CaptureDlg.h" rp0ZvEX  
#include <windowsx.h> Uy$)%dYfq5  
#pragma comment(lib,"hook.lib") p1|f<SF')  
#ifdef _DEBUG o9H^?Rut  
#define new DEBUG_NEW nG;8:f`  
#undef THIS_FILE xQ@^$_  
static char THIS_FILE[] = __FILE__; |JVk&8 ?8  
#endif FD8N"p  
#define IDM_SHELL WM_USER+1 beu\cV3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); WAS U0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (t4&,W_spA  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +9") KQT  
class CAboutDlg : public CDialog >2Kh0rIH  
{ VL*ovD%-  
 public: Et/&^&=\-  
  CAboutDlg(); `3hSL R  
  // Dialog Data |0%+wB  
  //{{AFX_DATA(CAboutDlg) X3V'Cy/sy  
  enum { IDD = IDD_ABOUTBOX }; fF V!)Zj  
  //}}AFX_DATA OdB?_.+$  
  // ClassWizard generated virtual function overrides f4PIoZ e  
  //{{AFX_VIRTUAL(CAboutDlg) ?'<nx{!c  
 protected: :at$HCaK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zNIsf "  
  //}}AFX_VIRTUAL 1SR+m>pL  
  // Implementation r}jGUe}d  
 protected: k0Uyf~p~  
  //{{AFX_MSG(CAboutDlg) !H}vu]R  
  //}}AFX_MSG iV eC=^1  
  DECLARE_MESSAGE_MAP() .3MIcj=p  
}; ,Y>Bex_v  
7IjQi=#:  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 3fh8$A  
{ &w1P\4?G  
 //{{AFX_DATA_INIT(CAboutDlg) mljh|[  
 //}}AFX_DATA_INIT 4-[J@  
} I:d[Q s  
:=[XW?L%x  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) n8D xB@DI  
{ KFFSv{m[  
 CDialog::DoDataExchange(pDX); ?IGVErnJJC  
 //{{AFX_DATA_MAP(CAboutDlg) [NTtz <i@  
 //}}AFX_DATA_MAP :P(K2q3  
} &Ky_v^  
:"!9_p(,,  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 14"J d\M8  
 //{{AFX_MSG_MAP(CAboutDlg) ](^(=%  
 // No message handlers <E0UK^-}  
 //}}AFX_MSG_MAP |USX[j m\  
END_MESSAGE_MAP() 1 %,a =,v  
b/Xbs0q  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ME=/|.}D<  
: CDialog(CCaptureDlg::IDD, pParent) Vl2XDkhq  
{ )u qA(R>  
 //{{AFX_DATA_INIT(CCaptureDlg) F<(i.o(  
  m_bControl = FALSE; xQp|;oW;z  
  m_bAlt = FALSE; T N!=@Gy  
  m_bShift = FALSE; ^*fxR]Y  
  m_Path = _T("c:\\"); lf!FTm7  
  m_Number = _T("0 picture captured."); C(K; zo*S(  
  nCount=0; m ]cHF.:5  
  bRegistered=FALSE; ;JRs?1<='  
  bTray=FALSE; q.()z(M 7  
 //}}AFX_DATA_INIT v= N!SaK{  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 w&x!,yd;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Bdu&V*0g  
} {je-I9%OK  
HX6Ma{vBk  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 56Vb+0J'  
{ u SR~@Lj ~  
 CDialog::DoDataExchange(pDX); @S 7sr-  
 //{{AFX_DATA_MAP(CCaptureDlg) NMi45y(Y  
  DDX_Control(pDX, IDC_KEY, m_Key); bcZf>:gVf  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); jr`Ess  
  DDX_Check(pDX, IDC_ALT, m_bAlt); -c}, :G"  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +(+Itmx2&  
  DDX_Text(pDX, IDC_PATH, m_Path); 7H|$4;X^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5Fz.Y}  
 //}}AFX_DATA_MAP %bdjBa}  
} "1-}A(X  
_IdRF5<4  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) HWVtop/  
//{{AFX_MSG_MAP(CCaptureDlg) UA yC.$!  
 ON_WM_SYSCOMMAND() m{7(PHpw  
 ON_WM_PAINT() Ogp"u b8  
 ON_WM_QUERYDRAGICON() \~5C7^_  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) S*sT] J`!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) !Lh^oPT"I  
 ON_BN_CLICKED(ID_CHANGE, OnChange) E.U_W  
//}}AFX_MSG_MAP m-jHze`D3  
END_MESSAGE_MAP() E~AjK'Z  
D91e\|]  
BOOL CCaptureDlg::OnInitDialog() 3q?\r` a  
{ T]?n)L,2  
 CDialog::OnInitDialog(); "hy.GWF|*  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0pSmj2/,.  
 ASSERT(IDM_ABOUTBOX < 0xF000); @GvztVYo  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Z*FrB58  
 if (pSysMenu != NULL) K_ ci_g":  
 { C*G=cs\i  
  CString strAboutMenu; D3x/OyG(  
  strAboutMenu.LoadString(IDS_ABOUTBOX); =?-ye!w  
  if (!strAboutMenu.IsEmpty()) IO/4.m-aN#  
  { 41_SRh7N  
   pSysMenu->AppendMenu(MF_SEPARATOR); .n=Z:*JqQ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); MG?0>^F  
  } }E7:ihy  
 } Q 3y;$"  
 SetIcon(m_hIcon, TRUE); // Set big icon  3S&U!  
 SetIcon(m_hIcon, FALSE); // Set small icon }>[G5[ \  
 m_Key.SetCurSel(0); ~M(5Ho  
 RegisterHotkey(); \fjMc }'  
 CMenu* pMenu=GetSystemMenu(FALSE); ~%2pp~1 K  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .&x}NYX4  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ]K*8O <  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); sQ 8s7l0D  
 return TRUE; // return TRUE unless you set the focus to a control 7 K{Nb  
} 84{Q\c  
A%2:E^k(s  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) gp-T"l  
{ nIvJrAm4k  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Z'k|u4ZC  
 { 5H9r=a  
  CAboutDlg dlgAbout; C -?!S  
  dlgAbout.DoModal(); :#lIx%l  
 } ${8?N:>t  
 else d O~O |Xsb  
 { fkSwD(  
  CDialog::OnSysCommand(nID, lParam); ILic.@st  
 } GAc{l=vT'  
} 0W%@gs5d&  
> MH(0+B*  
void CCaptureDlg::OnPaint() E~kG2x{a  
{ _0 m\[t.  
 if (IsIconic()) PG]%Bv57  
 { Gx 72  
  CPaintDC dc(this); // device context for painting HQ9X7[3  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); W<<9y  
  // Center icon in client rectangle &k8vWXMGk%  
  int cxIcon = GetSystemMetrics(SM_CXICON); w ;e(Gb%9  
  int cyIcon = GetSystemMetrics(SM_CYICON); A4QcQ"  
  CRect rect; W8g' lqc|  
  GetClientRect(&rect); h},oF!,  
  int x = (rect.Width() - cxIcon + 1) / 2; p\ Lq}tk<  
  int y = (rect.Height() - cyIcon + 1) / 2; Mzd[fR5a8  
  // Draw the icon $@i"un;  
  dc.DrawIcon(x, y, m_hIcon); `.2h jO  
 } BQ jK8c<  
 else 1R. 4:Dn_  
 { Cbs5dn(Y  
  CDialog::OnPaint(); x3zj ?-  
 } D\H/   
} ayBRWT0  
AE@NOM7u  
HCURSOR CCaptureDlg::OnQueryDragIcon() /(8a~f&%r  
{ BtY%r7^o  
 return (HCURSOR) m_hIcon; /Ky__l!bu  
} wJlX4cT4YV  
pN&c(=If  
void CCaptureDlg::OnCancel() m~'? /!!  
{ D.%B$Y;G  
 if(bTray) Y[SU&LM  
  DeleteIcon(); dC1V-x10ju  
  CDialog::OnCancel(); Xq4|uuS-O  
} T%Pp*1/m7  
c '\SfW<  
void CCaptureDlg::OnAbout() 4"= Vq5  
{ _3Cn{{ A0  
 CAboutDlg dlg; `O6:t\d@  
 dlg.DoModal(); wLV~F[:  
} ~l~Tk6EM  
B[9 (FRX  
void CCaptureDlg::OnBrowse() PNeh#PI 6)  
{ 0W^dhYO  
 CString str; {k(eNr,  
 BROWSEINFO bi; C}5M;|%3)  
 char name[MAX_PATH]; u? fTL2~  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #?B%Ja% ;W  
 bi.hwndOwner=GetSafeHwnd(); #;# 3%?  
 bi.pszDisplayName=name; `8\Ja$ =  
 bi.lpszTitle="Select folder"; /VHi >  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; H UWxPIu  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); .C]cK%OO N  
 if(idl==NULL) j 6ut}Uq  
  return; B%\gkl  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 5HS~op2n/  
 str.ReleaseBuffer(); q*)+K9LRk  
 m_Path=str; l|V;Ys5f  
 if(str.GetAt(str.GetLength()-1)!='\\') FP"$tt(  
  m_Path+="\\"; c6Q(Ygc  
 UpdateData(FALSE); Ejq#~Zhr!  
} kVS?RHR  
Pgp {$ID  
void CCaptureDlg::SaveBmp() V84*0&qOW  
{ iGXBqUQ:  
 CDC dc; b.2J]6G  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3_5XHOdE  
 CBitmap bm; W0cgI9=9  
 int Width=GetSystemMetrics(SM_CXSCREEN); %}>dqUyQ  
 int Height=GetSystemMetrics(SM_CYSCREEN); R \s!*)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); nF)uTk  
 CDC tdc; [XlB<P=|>  
 tdc.CreateCompatibleDC(&dc); zX7q:Pt  
 CBitmap*pOld=tdc.SelectObject(&bm); )$x_!=@1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $(q>mg:H  
 tdc.SelectObject(pOld); y0ckm6^  
 BITMAP btm; P|jF6?C  
 bm.GetBitmap(&btm); vs&8wbS)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; _U)%kY8  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); i z]rFNR  
 BITMAPINFOHEADER bih; rSV gWr8  
 bih.biBitCount=btm.bmBitsPixel; !Ngw\@f  
 bih.biClrImportant=0; )yxT+g2!  
 bih.biClrUsed=0; IJU0[EA]F  
 bih.biCompression=0; `&$B3)Eb  
 bih.biHeight=btm.bmHeight; R UTnc  
 bih.biPlanes=1; Ps R>V)L  
 bih.biSize=sizeof(BITMAPINFOHEADER); Cef:tdk7  
 bih.biSizeImage=size; #< CIFVH  
 bih.biWidth=btm.bmWidth; ]qw0V   
 bih.biXPelsPerMeter=0; bZipm(e  
 bih.biYPelsPerMeter=0; ")lw9t`  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); .+K S`  
 static int filecount=0; B>TSdn={>  
 CString name; 8)0 L2KL'  
 name.Format("pict%04d.bmp",filecount++); EA{U!b]cU  
 name=m_Path+name; v+1i= s2$  
 BITMAPFILEHEADER bfh; %3Bpn=k>  
 bfh.bfReserved1=bfh.bfReserved2=0; RHNk%9  
 bfh.bfType=((WORD)('M'<< 8)|'B'); #%S0PL"x U  
 bfh.bfSize=54+size; $;D* n'8Fx  
 bfh.bfOffBits=54; ;8B.;%qkL  
 CFile bf; CHaE;olo  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ RB3 zHk%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); yi!`V.  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); keqcV23k  
  bf.WriteHuge(lpData,size); >[*4Tjg  
  bf.Close(); %(LvE}[RJ  
  nCount++; So4nJ><p  
 } s'_,:R\VM>  
 GlobalFreePtr(lpData); GHN3PEJ>  
 if(nCount==1) &:#m&,tQ  
  m_Number.Format("%d picture captured.",nCount); .]76!(fWZ  
 else =ak7ld A=2  
  m_Number.Format("%d pictures captured.",nCount); -fIc4u[  
  UpdateData(FALSE); w}<^l  
} NW.XA! =E)  
CB*/ =Y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) hG Apuy  
{ Dl;d33  
 if(pMsg -> message == WM_KEYDOWN) KAb(NZK  
 { ,{<p  
  if(pMsg -> wParam == VK_ESCAPE) d\]O'U)s  
   return TRUE; Bh`IXu  
  if(pMsg -> wParam == VK_RETURN) R,Ml&4pZ}  
   return TRUE; if~rp-\P  
 } XT||M)#  
 return CDialog::PreTranslateMessage(pMsg); bsO@2NP'  
} 8sw,k   
HcJE0-"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l C\E  
{ wq72% e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ e.X@] PQJQ  
  SaveBmp(); BXTN>d27  
  return FALSE; +Z+ExS<#z  
} Fh`-(,e?5  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ W(@>?$&  
 CMenu pop; k:P$LzIB  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |< N frz  
 CMenu*pMenu=pop.GetSubMenu(0); NfF~dK|  
 pMenu->SetDefaultItem(ID_EXITICON); koH4~m{  
 CPoint pt; %D^bah f  
 GetCursorPos(&pt); If.n(t[M9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); |%ZpatZA5  
 if(id==ID_EXITICON) fS./y=j(X  
  DeleteIcon(); 6GKT yN  
 else if(id==ID_EXIT) JE)J<9gf  
  OnCancel(); u7muaSy  
 return FALSE; *]{=8zc2  
} EUwQIA2c8N  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); r'd/qnd  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }[,3yfiX  
 AddIcon(); ~n]NyVFP  
 return res; ?'2 v.5TQt  
} %CT!$Y'n  
P^(.tr3t  
void CCaptureDlg::AddIcon() 2X_>vIlEm  
{ F aWl,}]  
 NOTIFYICONDATA data; 37K U~9-A  
 data.cbSize=sizeof(NOTIFYICONDATA); T}2:.Hk:N  
 CString tip; ; J2-rh  
 tip.LoadString(IDS_ICONTIP); nW&$~d  
 data.hIcon=GetIcon(0); ylkqhs&  
 data.hWnd=GetSafeHwnd(); d;g-3Pf  
 strcpy(data.szTip,tip); (9z|a ,  
 data.uCallbackMessage=IDM_SHELL;  ^Fp=y,D  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0P9Wy!f7  
 data.uID=98; "/y|VTV"  
 Shell_NotifyIcon(NIM_ADD,&data); *8206[y  
 ShowWindow(SW_HIDE); KW>VOW<.  
 bTray=TRUE; "%kG RHq  
} c * 1S}us  
R HXvee55  
void CCaptureDlg::DeleteIcon() ]BfR.,,  
{ NUu;tjt:  
 NOTIFYICONDATA data; 6J;i,/ky  
 data.cbSize=sizeof(NOTIFYICONDATA);  h,hL?imD  
 data.hWnd=GetSafeHwnd(); 1(pjVz&  
 data.uID=98; ,cS0  
 Shell_NotifyIcon(NIM_DELETE,&data); 3k{c$x}  
 ShowWindow(SW_SHOW); ._ih$=   
 SetForegroundWindow(); ^^ j/  
 ShowWindow(SW_SHOWNORMAL); lE a W7j  
 bTray=FALSE; Jy`G]]?  
} \-G5l+!  
j]HE>  
void CCaptureDlg::OnChange() uTw|Q{f  
{ {jhcZ"#>\  
 RegisterHotkey(); &oc_ a1 R  
} 5U;nhDmM  
5m 3'Gt4  
BOOL CCaptureDlg::RegisterHotkey() /Tcb\:`9  
{ ^yD"d =z  
 UpdateData(); k -]xSKG  
 UCHAR mask=0; zf7rF}  
 UCHAR key=0; [,nfAY  
 if(m_bControl) J=V yyUB  
  mask|=4; Fd}<Uote3  
 if(m_bAlt) X?kPi&ru  
  mask|=2; 1!f2*m  
 if(m_bShift) LK %K0o  
  mask|=1; @?vLAsp\  
  key=Key_Table[m_Key.GetCurSel()]; xBt<Yt"  
 if(bRegistered){ s+N^PX3  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }8 \|1@09  
  bRegistered=FALSE; uegb;m  
 } :Lc3a$qtx5  
 cMask=mask; L77EbP`P  
 cKey=key; #Wq#beBb  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Q_v\1"c  
 return bRegistered; aulaX/'-_  
} [[&)cbv  
WRY~fM  
  四、小结 F*X%N_n  
w. vY(s  
  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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