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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: CvE^t#Bok  
  R$hIgw+p[  
  一、实现方法 ~M{/cv  
; Z7!BU  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: h7q{i|5  
5rB>)p05[  
#pragma data_seg("shareddata") 5l1R")0`t_  
HHOOK hHook =NULL; //钩子句柄 7<!x:G?C  
UINT nHookCount =0; //挂接的程序数目 f^B'BioW(  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 {qi #  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 '(3 QyCD  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey P@ew' JL%  
static int KeyCount =0; 8`urkEI^r  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 5(J?C-Pk  
#pragma data_seg() D^6iQW+.P  
,o%by5j"^N  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 V~j^   
OxGfLeP.R!  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: >fI\f <ez  
UWC4PWL,>C  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR >_ZEQC  
cKey,UCHAR cMask) p03I&d@w>  
{ g:)iEw>a  
 BOOL bAdded=FALSE; LX7P?j  
 for(int index=0;index<MAX_KEY;index++){ |~ fI=1;;x  
  if(hCallWnd[index]==0){ t e-xhJ&K  
   hCallWnd[index]=hWnd; +] ;WN  
   HotKey[index]=cKey; fEXFnQ#  
   HotKeyMask[index]=cMask; RVttk )Ny  
   bAdded=TRUE; TG$ #aX\'  
   KeyCount++; @ewaj!  
   break;  yP+<kv4  
  } <ytzGDx  
 } ZBpcC0 z  
 return bAdded; 5H XF3  
} vRC >=y*=  
//删除热键 5["3[h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5uQ+'*xN%  
{ c.Hw K\IU  
 BOOL bRemoved=FALSE; D1ZyJs#  
 for(int index=0;index<MAX_KEY;index++){ }i"[5:  
  if(hCallWnd[index]==hWnd){ g]: [^p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hQ<7k'V  
    hCallWnd[index]=NULL; =bC'>qw}  
    HotKey[index]=0; y*+8Z&i.:  
    HotKeyMask[index]=0; 81:%Z&?vRl  
    bRemoved=TRUE; w=;>  
    KeyCount--; :Q=y'<  
    break; SgewAng?@o  
   } z6@8IszU  
  } [?I<$f"  
 } HP]5"ziA  
 return bRemoved; 3{?X>6T  
} s2SV   
m8{8r>6*  
N s0,Z#Z+  
  DLL中的钩子函数如下: "ymR8 y'  
U[x$QG6m!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4%~*}  
{ >4luZnWMI  
 BOOL bProcessed=FALSE; ;UTM9.o[  
 if(HC_ACTION==nCode) Q&r. wV|  
 { -fFtHw:kHh  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 C_Q3^mLx  
   switch(wParam) A_S7z*T  
   {  JH]S'5X8K  
    case VK_MENU: 07:V[@'  
     MaskBits&=~ALTBIT; ~M^[  
     break; L5x;# \#p  
    case VK_CONTROL: WyatHC   
     MaskBits&=~CTRLBIT; E8r6P:5d`  
     break; N Nk  
    case VK_SHIFT: "NA<^2W@J  
     MaskBits&=~SHIFTBIT; )m;*d7l~p  
     break; JK< []>O  
    default: //judge the key and send message 4RVqfD  
     break; jdJTOT  
   } @ !su7  
   for(int index=0;index<MAX_KEY;index++){ 8b'@_s!_  
    if(hCallWnd[index]==NULL) !38KHq^|&  
     continue; vO2WZ7E!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tNr'@ls  
    { cdL]s^z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /g+-{+sx  
     bProcessed=TRUE; |3e+ K.  
    } l%_K$$C  
   } $aJ6i7C,j}  
  } L$_%T  
  else if((lParam&0xc000ffff)==1){ //有键按下 <<?32r~  
   switch(wParam) \h=*pAf  
   { \OkZ\!<hg  
    case VK_MENU: |E?r+]  
     MaskBits|=ALTBIT; E&kv4,  
     break; C3W4:kbau  
    case VK_CONTROL: kR97 )}Y  
     MaskBits|=CTRLBIT; dX/7n=  
     break; zJy=1r  
    case VK_SHIFT: YdO*5Gb6  
     MaskBits|=SHIFTBIT; <!>\ n\A  
     break; tlp,HxlP  
    default: //judge the key and send message ZN)EbTpc\a  
     break; <(>t"<  
   } e&ysj:W5 "  
   for(int index=0;index<MAX_KEY;index++){ *`"+J_   
    if(hCallWnd[index]==NULL) o+=wQ$"tP  
     continue; 2mzn{S)nV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P05`DX}r,  
    { /J-'[Mc'D[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); xkRMg2X.>9  
     bProcessed=TRUE; kqih`E9P7B  
    } 1i$VX|r  
   } 7\%JJw6h  
  } %f&Y=  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 HBe*wkPd  
   for(int index=0;index<MAX_KEY;index++){ Sk+XBX(}  
    if(hCallWnd[index]==NULL) [5L?#Y  
     continue; 1-E6ACq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r9{@e^Em  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Lq>lj`>  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ph""[0n%o  
   } O>pX(DS L  
  } _N|%i J5  
 } A{q%sp:3~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,o n]Fts  
} W{'hn&vU  
Z qn$>mG-  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 7P3pjgh  
@U=y}vi8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZcjLv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &,G2<2_b  
ZH\t0YhrVe  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: (4 ZeyG@  
:lo5,B;k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) AA[1[  
{ N8Rq7i3F?a  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *nU5PSs  
 { 0yC~"u[N Y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 n',X,P0  
  SaveBmp(); ! 1I# L!9  
  return FALSE; )  M0(vog  
 } Ygk_gBRiC  
 …… //其它处理及默认处理 R q@|o5O  
} 6vbKKn`ST  
1ygEyC[1  
G(wK(P0j  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 BH {z]a  
I ==)a6^  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 'qT;Eht5  
+Xw%X3o)  
  二、编程步骤 zs]ubJC@  
>&;J/ME  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ]'Eg2(wy  
xwZ1Q,'C  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~*1>)P8]#  
iT==aJ=~/&  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ")MHP~ ?  
kbb!2`F!%  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; gq+0t  
J8S$YRZ_  
  5、 添加代码,编译运行程序。 T2Z$*;,>T  
HI|egf@  
三、程序代码 1 jB0gNe  
dj (&"P  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL -(TC'  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) *Lrrl  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4dFr~ {  
#if _MSC_VER > 1000 79>x/jZka  
#pragma once ?aTH<  
#endif // _MSC_VER > 1000 nD/B :0'  
#ifndef __AFXWIN_H__ 5PeYQ-B|  
#error include 'stdafx.h' before including this file for PCH TM6wjHFm  
#endif 3_  J'+  
#include "resource.h" // main symbols p35)K5V  
class CHookApp : public CWinApp LAk .f  
{ "W6cQsi  
 public: ?9{^gW4|  
  CHookApp(); gBV4IQ  
  // Overrides GEy7Vb)  
  // ClassWizard generated virtual function overrides cwvJH&%0  
  //{{AFX_VIRTUAL(CHookApp) 5fk A?Ecqq  
 public: 3HtM<su*h  
  virtual BOOL InitInstance(); I-!7 EC2{!  
  virtual int ExitInstance(); kIS )*_  
  //}}AFX_VIRTUAL s3A(`heoq  
  //{{AFX_MSG(CHookApp) 9U<WR*H  
  // NOTE - the ClassWizard will add and remove member functions here. S>x@9$( ym  
  // DO NOT EDIT what you see in these blocks of generated code ! Ag0w8F  
  //}}AFX_MSG V z  
  DECLARE_MESSAGE_MAP() Qc*p+N+$  
}; c`3`}&g#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); C0w_pu  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ux',ma1JK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d4IQ;u  
BOOL InitHotkey(); bX38=.up  
BOOL UnInit(); =t_+ajY%  
#endif `m(ZX\W]  
A94:(z;{  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. h *;c"/7  
#include "stdafx.h" Y S7lB  
#include "hook.h" [7.Num_L  
#include <windowsx.h> e}2?)B`[  
#ifdef _DEBUG ~\-=q^/!  
#define new DEBUG_NEW b~fl,(sZp  
#undef THIS_FILE <#BK(W~$  
static char THIS_FILE[] = __FILE__; y]{b4e  
#endif ?yAb=zI1b  
#define MAX_KEY 100 e:-pqZT`  
#define CTRLBIT 0x04 4ZUtK/i+r  
#define ALTBIT 0x02 ~N9k8eT  
#define SHIFTBIT 0x01 _"Y7}A\9  
#pragma data_seg("shareddata") `/m] K ~~  
HHOOK hHook =NULL; hb8oq3*x  
UINT nHookCount =0; /[Fk>Vhp  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ^3sv2wh^|8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ?pJ2"/K   
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Ma?uB8o+~  
static int KeyCount =0; Z*3RI5)dx  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift W!ug^2"  
#pragma data_seg() r:o9:w:  
HINSTANCE hins; E^n!h06~G  
void VerifyWindow(); @dK_w 'W  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) lW-G]V  
//{{AFX_MSG_MAP(CHookApp) A ,0}bFK  
// NOTE - the ClassWizard will add and remove mapping macros here.  Hvz;[!  
// DO NOT EDIT what you see in these blocks of generated code! %fld<O  
//}}AFX_MSG_MAP _gK}Gi?|  
END_MESSAGE_MAP() ZJbaioc\  
-{*3<2rFK  
CHookApp::CHookApp() ]+ub R;  
{ 1^NC=IS9z  
 // TODO: add construction code here, dAG@'A\f  
 // Place all significant initialization in InitInstance a{7*um  
} + rB3\R"d  
tC1'IE-h  
CHookApp theApp; %Jl6e}!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >N! Xey  
{ E5S(1Z}]p{  
 BOOL bProcessed=FALSE; gF9GU5T:  
 if(HC_ACTION==nCode) @+~URIG)  
 { 'U&]KSzxv  
  if((lParam&0xc0000000)==0xc0000000){// Key up `@\FpV[|P  
   switch(wParam) ?-&k?I  
   { !4^Lv{1QZ  
    case VK_MENU: Ye|gW=FUR  
     MaskBits&=~ALTBIT; ql.[Uq  
     break; u7J:ipyiq2  
    case VK_CONTROL: 8}[<3K%*g  
     MaskBits&=~CTRLBIT; &VU^d3gv~  
     break; BuM #&]s  
    case VK_SHIFT: 0*P-/)o x  
     MaskBits&=~SHIFTBIT; FDiDHOR  
     break; ,^ -%<  
    default: //judge the key and send message u$nmnd`g  
     break; pT+OPOSR  
   } 4avkyFj!h  
   for(int index=0;index<MAX_KEY;index++){ e 0$m<5  
    if(hCallWnd[index]==NULL) B;Z _'.i,d  
     continue; 1HSt}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L1` ^M  
    { \g]rOYW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _{if"  
     bProcessed=TRUE; ffB<qf)?G  
    } d/TFx  
   } 56c3tgVF  
  }  ]E :L  
  else if((lParam&0xc000ffff)==1){ //Key down "6WJj3h N  
   switch(wParam) kN<;*jHV  
   { _,F\%}  
    case VK_MENU: MftaT5  
     MaskBits|=ALTBIT; b-`P-  
     break; XOS^&;  
    case VK_CONTROL: Vd.XZ*}r*  
     MaskBits|=CTRLBIT; KIuj;|!q  
     break; k%-y \WM  
    case VK_SHIFT: JeVbFZ8  
     MaskBits|=SHIFTBIT; wuCZz{c7  
     break; PCDvEbpG  
    default: //judge the key and send message 'q/C: Yo  
     break; w5-^Py  
   } ~tNk\Kkv  
   for(int index=0;index<MAX_KEY;index++) ~P!=fU)  
   { 9-A@2&J1  
    if(hCallWnd[index]==NULL) o}wRgG  
     continue; [D?xd/G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %PR,TWe  
    { +=L+35M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9*"K+t:  
     bProcessed=TRUE; RM%Z"pc Y6  
    } tg%<@U`7=  
   } | Cfo(]>G  
  } S._h->5f  
  if(!bProcessed){ HF&d HD2f  
   for(int index=0;index<MAX_KEY;index++){ i)'u!V  
    if(hCallWnd[index]==NULL) (Ze\<Y#cv  
     continue; `"~X1;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7|J&fc5BP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); i7\>uni  
   } a(JtGjTf&  
  } y </i1qM  
 } ~d3BVKP5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); L^s?EqLXS  
} RHu,t5,  
\"yR[.Q?   
BOOL InitHotkey() T sJ71  
{ /3"S_KE1@+  
 if(hHook!=NULL){ S]&i<V1qX  
  nHookCount++; f .h$jyp(  
  return TRUE; BNJG-b|g^  
 } "1P2`Ep;  
 else _ -ec(w~/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); `Sj8IxO  
  if(hHook!=NULL) -%VFC^'5  
   nHookCount++; k]TJL9Q  
  return (hHook!=NULL); tJGPkeA  
} N7s9"i  
BOOL UnInit() k[1[Y{n.  
{ O1]XoUH<  
 if(nHookCount>1){ 9 771D  
  nHookCount--; aO<H!hK  
  return TRUE; cwUor}<|  
 } !VfVpi+-  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ryd}-_LL  
 if(unhooked==TRUE){ `AdHyE  
  nHookCount=0; d7kv <YG  
  hHook=NULL; h* /  
 } @:9mTP7  
 return unhooked; gr>FLf   
} Xn<|6u  
D{t0OvQag  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `Uk jr MO  
{ $- Z/UHT  
 BOOL bAdded=FALSE; 38JU-aq  
 for(int index=0;index<MAX_KEY;index++){ n;dWb$:  
  if(hCallWnd[index]==0){ \>eFs} Y/  
   hCallWnd[index]=hWnd; 8,m:  
   HotKey[index]=cKey; .B$3y#TOb  
   HotKeyMask[index]=cMask; F|WH=s3  
   bAdded=TRUE; okW'}@jD  
   KeyCount++; Pb :6nH=  
   break; =gB{(  
  } G~4|]^`g  
 } ht5:kt`F  
 return bAdded; )T^aJ-Uf  
} 0ENqK2  
AkqGk5e ^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) afcyAzIB&  
{ AqrK==0N  
 BOOL bRemoved=FALSE; TF,a `?c`  
 for(int index=0;index<MAX_KEY;index++){ JnH5v(/  
  if(hCallWnd[index]==hWnd){ 6tM@I`l  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .aIFm5N3?  
    hCallWnd[index]=NULL; ]<O -  
    HotKey[index]=0; A5dH*< }  
    HotKeyMask[index]=0; gm&O-N"= U  
    bRemoved=TRUE; iB'g7&,L  
    KeyCount--; O{G $]FtF  
    break; &-Z#+>=H(  
   } :Z5kiEwYM  
  } >LB x\/  
 } h6Hop mWVx  
 return bRemoved; odq3@ ziO  
} l_=kW!l  
<gr2k8m6$  
void VerifyWindow() _k W:FB  
{ xJ|Z]m=d   
 for(int i=0;i<MAX_KEY;i++){ iw EHEi%  
  if(hCallWnd!=NULL){ YpbJoHiSH  
   if(!IsWindow(hCallWnd)){ *WXqN!:  
    hCallWnd=NULL; %u$dN9cw  
    HotKey=0; nHF  
    HotKeyMask=0; Jc9^Hyqu&  
    KeyCount--; $2*&\/;-E!  
   } SB!m&;Tb  
  } o&:n>:im  
 } %PU {h  
} 9\NP)Vm$^  
SVyJUd_  
BOOL CHookApp::InitInstance() =}4lx^`oeT  
{ $S!WW|9j.  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); E@;v|Xc  
 hins=AfxGetInstanceHandle(); _:;j)J0  
 InitHotkey(); b(gcnSzM2  
 return CWinApp::InitInstance(); 9]/j u  
} !HHbd |B_  
A,#hYi=-,  
int CHookApp::ExitInstance() zn{[]J  
{ Tn3f5ka'  
 VerifyWindow(); d "vd_}P~  
 UnInit(); ('px X+  
 return CWinApp::ExitInstance(); pDx}~IB  
} z'}?mE3i  
p}swJ;S  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file NBZ>xp[U  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) j k}m  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #8jH_bi  
#if _MSC_VER > 1000 \OXKK<^$uK  
#pragma once }GTy{Y*&  
#endif // _MSC_VER > 1000 3/hAxd  
/2!"_?<L  
class CCaptureDlg : public CDialog :WnXoL  
{ y7s.6i}7  
 // Construction Y:="vWWG  
 public: V/-~L]G  
  BOOL bTray; (gv ~Vq  
  BOOL bRegistered; @'!61'}f  
  BOOL RegisterHotkey(); S$I:rbc  
  UCHAR cKey; ETVT.R8   
  UCHAR cMask; >taZw '  
  void DeleteIcon(); xR;-qSl7Ms  
  void AddIcon(); Swz1RT  
  UINT nCount; 5Gsj;   
  void SaveBmp(); 0Z{(,GU  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor U!x\oLP  
  // Dialog Data QcQ|,lA.HI  
  //{{AFX_DATA(CCaptureDlg) ;EfMTI}6K  
  enum { IDD = IDD_CAPTURE_DIALOG }; KPA5 X]  
  CComboBox m_Key; MXhRnVz"W  
  BOOL m_bControl; B1Iq:5nmoS  
  BOOL m_bAlt; VI`x fmVOQ  
  BOOL m_bShift; way-Q7  
  CString m_Path; X_eV<]zA+  
  CString m_Number; |"Oazll  
  //}}AFX_DATA Zb#  
  // ClassWizard generated virtual function overrides \:?H_^^ d  
  //{{AFX_VIRTUAL(CCaptureDlg) G1'w50Yu  
 public: a[8_ O-   
  virtual BOOL PreTranslateMessage(MSG* pMsg); @]h#T4z'  
 protected: AH], >i3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support T;< >""T  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :PaFC{O)*  
  //}}AFX_VIRTUAL O_PC/=m1@  
  // Implementation m"vV=6m|\  
 protected: [ @/[#p  
  HICON m_hIcon; Va/ p   
  // Generated message map functions JhDjY8?86  
  //{{AFX_MSG(CCaptureDlg) ;mb 6i_  
  virtual BOOL OnInitDialog(); afc?a-~Z  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7_/.a9$G  
  afx_msg void OnPaint(); &[KFCn  
  afx_msg HCURSOR OnQueryDragIcon(); -}juj;IVv  
  virtual void OnCancel(); GOwd=]e  
  afx_msg void OnAbout(); uS|Zkuk[!  
  afx_msg void OnBrowse(); u;:N 4d=f'  
  afx_msg void OnChange(); \9/n~/{  
 //}}AFX_MSG y K&)H+v  
 DECLARE_MESSAGE_MAP() q+o(`N'~G  
}; MU&5&)m  
#endif "v3u$-xN1  
aV(*BE/@F  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file lv ^=g  
#include "stdafx.h" I/)dXk~  
#include "Capture.h" /HDX[R   
#include "CaptureDlg.h" pp[? k}@  
#include <windowsx.h>  m|"MJP  
#pragma comment(lib,"hook.lib") *qBMt[a  
#ifdef _DEBUG 9HEc=,D|  
#define new DEBUG_NEW 95wV+ q*  
#undef THIS_FILE %r!  
static char THIS_FILE[] = __FILE__; T+4Musu{V  
#endif j`'=K_+nU  
#define IDM_SHELL WM_USER+1 W3 8 =fyD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qW<: `y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {YbqB6zaM  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; M3F8@|2  
class CAboutDlg : public CDialog a<gzI  
{ n(f&uV_):  
 public: a3lo;Cfp  
  CAboutDlg(); :({lXGc}4?  
  // Dialog Data p-; ]O~^  
  //{{AFX_DATA(CAboutDlg) % e1vq  
  enum { IDD = IDD_ABOUTBOX }; V`WfJ>{;Z  
  //}}AFX_DATA [bT@Y:X@`  
  // ClassWizard generated virtual function overrides <qRw! 'S^  
  //{{AFX_VIRTUAL(CAboutDlg) `g :<$3}  
 protected: iKS9Xss8  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support T)Nis~  
  //}}AFX_VIRTUAL 9 [I ro  
  // Implementation #t(?8!F  
 protected: a* IJ)'S  
  //{{AFX_MSG(CAboutDlg) G(0 bulq  
  //}}AFX_MSG j^!J: Bj  
  DECLARE_MESSAGE_MAP() ) L{Tn 8  
}; {U(h]'  
S5Px9&N8(  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) tc,7yo\".  
{ QX]tD4OH  
 //{{AFX_DATA_INIT(CAboutDlg) (I~,&aBr  
 //}}AFX_DATA_INIT m#;:%.Rm  
} MA-$aN_(  
ga~vQ7I_  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Zz3#Kt5t3  
{ mifYk>J^9  
 CDialog::DoDataExchange(pDX); #uXOyiE  
 //{{AFX_DATA_MAP(CAboutDlg) x)* /3[  
 //}}AFX_DATA_MAP vp_$6  
} <WbD4Q<3?  
Vi?Z`G]w!  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) x.r`(  
 //{{AFX_MSG_MAP(CAboutDlg) 7R2)Klt  
 // No message handlers 9vj:=,TNu  
 //}}AFX_MSG_MAP  vo(?[[  
END_MESSAGE_MAP() X)&Z{ V>  
wRiP5U,  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) iN {TTy  
: CDialog(CCaptureDlg::IDD, pParent) Ph%s.YAZ~  
{ Dps{[3Y+  
 //{{AFX_DATA_INIT(CCaptureDlg) `Ys })Pl  
  m_bControl = FALSE; ~fUSmc  
  m_bAlt = FALSE; mpF_+Mn  
  m_bShift = FALSE; *nC,= 2  
  m_Path = _T("c:\\"); h?1pGz)[C  
  m_Number = _T("0 picture captured."); lb6s3b  
  nCount=0; oF6MV&q/  
  bRegistered=FALSE; D&^:hs@  
  bTray=FALSE; {Jy%h8n*  
 //}}AFX_DATA_INIT \rN_CBM  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 UQdQtj1'  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Cg|uHI*  
} 88*RlxU  
d!LV@</  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <V8i>LBlz  
{ }mGD`5[`  
 CDialog::DoDataExchange(pDX); aw4+1.xy  
 //{{AFX_DATA_MAP(CCaptureDlg) T8(wzs  
  DDX_Control(pDX, IDC_KEY, m_Key); $tKATL*  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :cEe4a  
  DDX_Check(pDX, IDC_ALT, m_bAlt); S BoF (0<  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?^!dLW  
  DDX_Text(pDX, IDC_PATH, m_Path); 1!C,pXU#:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Kk(ucO  
 //}}AFX_DATA_MAP A_fU7'B  
} QO>*3,(H,q  
1c4%g-]7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Iw:("A&~  
//{{AFX_MSG_MAP(CCaptureDlg) v}Nx*%  
 ON_WM_SYSCOMMAND() : [9'nR  
 ON_WM_PAINT() ["IJ h  
 ON_WM_QUERYDRAGICON() '_<`dzz  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) H.mG0x`M"E  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) y,>m#6hx#  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >V$#Um?AXj  
//}}AFX_MSG_MAP 2r0!h98  
END_MESSAGE_MAP() (qP$I:Q4]v  
Iq=B]oE  
BOOL CCaptureDlg::OnInitDialog() 8WGM%n#q  
{ :V2 Q n-N  
 CDialog::OnInitDialog(); prs<ZxbQb  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Xda<TX@-  
 ASSERT(IDM_ABOUTBOX < 0xF000); iHn]yv3 #  
 CMenu* pSysMenu = GetSystemMenu(FALSE); wEbs E<</  
 if (pSysMenu != NULL) eEh0T %9K  
 { &aQ)x   
  CString strAboutMenu; 7EO&:b]  
  strAboutMenu.LoadString(IDS_ABOUTBOX); DnFl*T>  
  if (!strAboutMenu.IsEmpty()) q{ 1U  
  { }\{1`$*~  
   pSysMenu->AppendMenu(MF_SEPARATOR); vTEkh0Ys  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %Tb|Yfyr C  
  } 7x]nY.\  
 } {4 d$]o0V  
 SetIcon(m_hIcon, TRUE); // Set big icon %Eh%mMb^  
 SetIcon(m_hIcon, FALSE); // Set small icon u_"h/)C'H  
 m_Key.SetCurSel(0); z{jAt6@7  
 RegisterHotkey(); D5b _m|7%  
 CMenu* pMenu=GetSystemMenu(FALSE); c]r|I %D  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); NKKO A  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); kw~H%-,]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $Ig,cTR.b  
 return TRUE; // return TRUE unless you set the focus to a control S: uEK  
} SkA'+(  
.8!0b iS  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) FxX3Pq8h  
{ `VE&Obp[  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) P$ef,ZW"  
 { Hu7zmh5FF  
  CAboutDlg dlgAbout; EI.Pk>ZIm  
  dlgAbout.DoModal(); =*}Mymhk(  
 } +|<&#b0Xd  
 else aF"Z!HD  
 { Hc%\9{zH  
  CDialog::OnSysCommand(nID, lParam); =M#?*e  
 } PcHFj+:  
} )YtL=w?L'  
05 Q8`  
void CCaptureDlg::OnPaint() y;Ln ao7i  
{ pe%)G6@G  
 if (IsIconic()) Ur(o&,  
 { .6F3;bg R7  
  CPaintDC dc(this); // device context for painting MEnHC'nI  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Jwt I(>cI  
  // Center icon in client rectangle gtGKV  
  int cxIcon = GetSystemMetrics(SM_CXICON); aQ:f"0fL  
  int cyIcon = GetSystemMetrics(SM_CYICON); )o</gt)  
  CRect rect; z 2VCK@0  
  GetClientRect(&rect); 7B!Qq/E?g  
  int x = (rect.Width() - cxIcon + 1) / 2; s)8M? |[`I  
  int y = (rect.Height() - cyIcon + 1) / 2; %,cFX[D/)  
  // Draw the icon A<5`[<x$  
  dc.DrawIcon(x, y, m_hIcon); ya L W(@  
 } xBfe8lor  
 else LC\:xia{X  
 { J8BT%  
  CDialog::OnPaint(); @h$0S+?:  
 } [(F<|f:n  
} dd7nO :]  
F'$S!K58  
HCURSOR CCaptureDlg::OnQueryDragIcon() $jh>zf  
{ )9*3^v  
 return (HCURSOR) m_hIcon; gNN" H#=2  
} sg"D;b:X  
Zt2@?w;  
void CCaptureDlg::OnCancel() 9Pp|d"6]y  
{ M6*{#Y?  
 if(bTray) &N_c-@2O  
  DeleteIcon(); 7QiCZcb\  
  CDialog::OnCancel(); xyjV dD\  
} 3e6Y  
q;zf|'&*7C  
void CCaptureDlg::OnAbout() tq:tY}:4  
{ %=4ak]As  
 CAboutDlg dlg; n=o'ocdS)  
 dlg.DoModal(); b\;u9C2y'  
} 5 t`ap  
^+Vk#_2Q  
void CCaptureDlg::OnBrowse() YQ@6innT  
{ L##8+OJ.L  
 CString str;  pl,Z  
 BROWSEINFO bi; n`z+ w*  
 char name[MAX_PATH]; &:CjUaP@  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); */^2RZg|W  
 bi.hwndOwner=GetSafeHwnd(); 6_5d  
 bi.pszDisplayName=name; t?nc0;Q9,@  
 bi.lpszTitle="Select folder"; G6 8Nv:  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; _RL-6jw#o  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); MR_bq_)  
 if(idl==NULL) RjGB#AK  
  return; :-\ yy  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); %^5@z1d,  
 str.ReleaseBuffer(); >`<2}Me6  
 m_Path=str; iqednk%  
 if(str.GetAt(str.GetLength()-1)!='\\') [x<6v}fRn  
  m_Path+="\\"; OW^2S_H5  
 UpdateData(FALSE); hJ[mf1je=  
} R=?po=  
"c/s/$k//  
void CCaptureDlg::SaveBmp() V9E6W*IE  
{ z34>,0  
 CDC dc; ^~6]0$yJ  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); pP0Vg'V  
 CBitmap bm; sjzXJ`s  
 int Width=GetSystemMetrics(SM_CXSCREEN); Sn0gTsZ  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0)oN[  
 bm.CreateCompatibleBitmap(&dc,Width,Height); k<Tez{<  
 CDC tdc; 3Q$'qZw p  
 tdc.CreateCompatibleDC(&dc); hygnC`|  
 CBitmap*pOld=tdc.SelectObject(&bm); XJ h:U0  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7 ZL#f![{  
 tdc.SelectObject(pOld); J,1osG<6x  
 BITMAP btm; t+ S~u^  
 bm.GetBitmap(&btm); Sq-3-w,R~  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; q^N0abzgP  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); @v ~ Pwr!  
 BITMAPINFOHEADER bih; <m>l-]  
 bih.biBitCount=btm.bmBitsPixel; M[K0t>ih  
 bih.biClrImportant=0; ;>Ca(Y2M  
 bih.biClrUsed=0; /iUUM t'  
 bih.biCompression=0; P YF.#@":&  
 bih.biHeight=btm.bmHeight; MKe^_uF  
 bih.biPlanes=1; #A3v]'7B  
 bih.biSize=sizeof(BITMAPINFOHEADER); -jVaS w t  
 bih.biSizeImage=size; Be{/2jU%  
 bih.biWidth=btm.bmWidth; 98A(jsj  
 bih.biXPelsPerMeter=0; Dr6s ^}}~n  
 bih.biYPelsPerMeter=0; 7rdw`  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {x[;5TM  
 static int filecount=0; X7H'Uk9:  
 CString name; `8Jq~u6_Z  
 name.Format("pict%04d.bmp",filecount++); Vm~qk  
 name=m_Path+name; W`N}  
 BITMAPFILEHEADER bfh; W]O@DS zR  
 bfh.bfReserved1=bfh.bfReserved2=0; wHt J_Y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Zlk,])9Q  
 bfh.bfSize=54+size; zkh hN"bX  
 bfh.bfOffBits=54; /^'Bgnez  
 CFile bf; 9k\)tWe  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ x7.QL?qR.  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "]T$\PJun  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \TbsoWX  
  bf.WriteHuge(lpData,size); +5HnZ?E\  
  bf.Close(); V#NG+U.B  
  nCount++; m Ztv G,  
 } KZF0rW  
 GlobalFreePtr(lpData); =naR{pI  
 if(nCount==1) b " ")BT  
  m_Number.Format("%d picture captured.",nCount); jC%35bi  
 else ym|NT0_0  
  m_Number.Format("%d pictures captured.",nCount); dI^IK  
  UpdateData(FALSE); ufw3H9F(O  
} tlV &eN  
D0 /DI  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) dn ZzA  
{ S9 G+#[.|  
 if(pMsg -> message == WM_KEYDOWN) ^kn ^CI6  
 { s.yq}Q  
  if(pMsg -> wParam == VK_ESCAPE) <b d1  
   return TRUE; <vB<`   
  if(pMsg -> wParam == VK_RETURN) }bf=Ntk  
   return TRUE; (#!] fF"!x  
 } |5xYT 'V  
 return CDialog::PreTranslateMessage(pMsg); e Om< !H  
} <nWKR,  
0n:?sFY>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?;|@T ty%  
{ b!0DH[XKV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =&A!C"qK4[  
  SaveBmp(); KVB0IXZC~  
  return FALSE; w 66 v\x~  
} u8YB)kG  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <S1??  
 CMenu pop; -<qxO  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); T[;; 9z  
 CMenu*pMenu=pop.GetSubMenu(0); 1 -ZJT  
 pMenu->SetDefaultItem(ID_EXITICON); }zFf0.82  
 CPoint pt; Y[Q @WdE9  
 GetCursorPos(&pt); x\hWyY6J[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); '>j<yaD'  
 if(id==ID_EXITICON) X^}A*4j  
  DeleteIcon(); TUh&d5a9H  
 else if(id==ID_EXIT) ]^=|Zd-  
  OnCancel(); qib 7Z]j  
 return FALSE; 6HoqEku/Q  
} [X,A'Q  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); AR%hf  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) "8N"Udu  
 AddIcon(); TQP+>nS,  
 return res; R?cUy8?'S  
} _!n}P5  
QR<`pmB~y  
void CCaptureDlg::AddIcon() 43zUN  
{ +TC1nkX  
 NOTIFYICONDATA data; CqqXVF3  
 data.cbSize=sizeof(NOTIFYICONDATA); LA-_3UJx  
 CString tip; B?LXI3sQZ  
 tip.LoadString(IDS_ICONTIP); 25:Z;J>  
 data.hIcon=GetIcon(0); x# VyQ[ok  
 data.hWnd=GetSafeHwnd(); *5'.!g('  
 strcpy(data.szTip,tip); [oV{83f  
 data.uCallbackMessage=IDM_SHELL; bpCNho$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; EYL]TeS  
 data.uID=98; \PpXL*.  
 Shell_NotifyIcon(NIM_ADD,&data); 7K&}C;+  
 ShowWindow(SW_HIDE); OL3UgepF  
 bTray=TRUE; /aZE,IeEz  
} 6*u,c^a  
x(8n 9Q>  
void CCaptureDlg::DeleteIcon() >1 @Ltvm  
{ `)32&\  
 NOTIFYICONDATA data; BQ#3QL't  
 data.cbSize=sizeof(NOTIFYICONDATA); AUfS-  
 data.hWnd=GetSafeHwnd(); #EbGL])F}  
 data.uID=98; s5l3V2k  
 Shell_NotifyIcon(NIM_DELETE,&data); Jf7frzw  
 ShowWindow(SW_SHOW); [*8Y'KX <  
 SetForegroundWindow(); 8tLHr@%%  
 ShowWindow(SW_SHOWNORMAL); XS?gn.o\  
 bTray=FALSE; ZK6Hvc0  
} o0ZIsrr  
?aBj#  
void CCaptureDlg::OnChange() mEFw|M{  
{ Yd:Q`#7A  
 RegisterHotkey(); f1mHN7hxW  
} !VwmPAMr#v  
hSB?@I4s<\  
BOOL CCaptureDlg::RegisterHotkey() $Pxb1E  
{ d?A}qA[(  
 UpdateData(); -v+&pG?m  
 UCHAR mask=0; B5ea(j  
 UCHAR key=0; w u)Wg-dT  
 if(m_bControl) i9rS6<V'  
  mask|=4; B8T\s)fxnX  
 if(m_bAlt) +4et7  
  mask|=2; %,\=s.~1  
 if(m_bShift) xRum*}|4  
  mask|=1; !K cWH9  
  key=Key_Table[m_Key.GetCurSel()]; whye)w  
 if(bRegistered){ DP 9LO_{  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); dC.bt|#Oz  
  bRegistered=FALSE; /b5>Qp  
 } 6<X%\[)n  
 cMask=mask; -/ +#5.`1  
 cKey=key; ACg;CTB b  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pr tK:eGe2  
 return bRegistered; 03=5Nof1  
} ?]#OM_,8  
3J~0O2  
  四、小结 W @.Ji B  
j8++R&1f]  
  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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