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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: zY=eeG+4s  
  {%b*4x0?  
  一、实现方法 KW1b #g%Z  
miTySY6 ^  
  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: 7B)m/%>3s  
+M=`3jioL  
#pragma data_seg("shareddata") (/a#1Pd&  
HHOOK hHook =NULL; //钩子句柄 ~stJO])a  
UINT nHookCount =0; //挂接的程序数目 9z$fDs}.q  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 -/'_XR@1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 L]kd.JJvy  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey iX|K4.Pz{  
static int KeyCount =0; \~!!h.xR  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 HPz3"3n!  
#pragma data_seg() ~EL3I  
{gkzo3  
  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。 !K[UJQ s\  
w5+H9R6  
  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: $~+(si2  
r&y0`M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ouE/\4'NB  
cKey,UCHAR cMask) je`Ysben  
{ YstR T1  
 BOOL bAdded=FALSE; (xdC'@&  
 for(int index=0;index<MAX_KEY;index++){ e1OGGF%E n  
  if(hCallWnd[index]==0){ n(h9I'V8)F  
   hCallWnd[index]=hWnd; .US=fWyrb  
   HotKey[index]=cKey; ~~\C.6c#  
   HotKeyMask[index]=cMask; H-&T)  
   bAdded=TRUE; v6 C$Y+5~  
   KeyCount++; e=^^TX`I  
   break; 2Wn*J[5  
  } K'_qi8Z  
 } \]8 F_K  
 return bAdded; v8} vk]b  
} .sCj3sX*  
//删除热键 VtN1 [}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Cvp!(<<gK  
{ CBr(a'3{Z  
 BOOL bRemoved=FALSE; 3%[;nhbA7  
 for(int index=0;index<MAX_KEY;index++){ g2;lEW  
  if(hCallWnd[index]==hWnd){ n "bii7h  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #PkZi(k hv  
    hCallWnd[index]=NULL; &"r /&7:  
    HotKey[index]=0; W=:AOBK  
    HotKeyMask[index]=0; C<Z{G%Qm  
    bRemoved=TRUE; U EjP`  
    KeyCount--; ;aN_!! r  
    break; 5MCnGg@  
   } QdrZi.qKH  
  } smUSR4VK  
 } /rIyW?& f  
 return bRemoved; lQM&q  
} :N^+!,i  
z ub"Ap3  
b} 0G~oLP  
  DLL中的钩子函数如下: rez )$  
V1&qgAy~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8<)ZpB,7  
{ hYht8?6}m  
 BOOL bProcessed=FALSE; {vq| 0t\-  
 if(HC_ACTION==nCode) u*T( n s l  
 { "g,`Ks ];  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 xG(xG%J  
   switch(wParam) bu9.Hv T'  
   {  GXp`yK9c  
    case VK_MENU: J= [D'h  
     MaskBits&=~ALTBIT; T-LX>*  
     break; kV+%(Gl8  
    case VK_CONTROL: c'.XC}  
     MaskBits&=~CTRLBIT; lvsj4 cT  
     break; !-t,r%CG  
    case VK_SHIFT: Vw|P;LLl`  
     MaskBits&=~SHIFTBIT; M#_|WL~  
     break; F8S>Ld  
    default: //judge the key and send message \%|Xf[AX  
     break; PjD9D.  
   } i\,I)S%yJ  
   for(int index=0;index<MAX_KEY;index++){ p|C[T]J\@  
    if(hCallWnd[index]==NULL) fX.1=BjXi  
     continue;  k^Q.lb {  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Vu,e ]@  
    { Y4C<4L?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); P)l_ :;&  
     bProcessed=TRUE; <2E|URo,#  
    } &|<f|B MX  
   } iF9d?9TWl  
  } o! l Ykud  
  else if((lParam&0xc000ffff)==1){ //有键按下 )n]" ~I^  
   switch(wParam) o1vK2V  
   { 5X f]j=_  
    case VK_MENU: ;I&XG  
     MaskBits|=ALTBIT; j4<K0-?  
     break; Xhq7)/jp  
    case VK_CONTROL: $g^D1zkuDT  
     MaskBits|=CTRLBIT; "[eH|z/  
     break; Z5E; FGPb  
    case VK_SHIFT: WfD fj  
     MaskBits|=SHIFTBIT; EV?U !O  
     break; T](}jQxj`  
    default: //judge the key and send message R G*Vdom  
     break; \BuyJskE  
   } ^)wKS]BQ..  
   for(int index=0;index<MAX_KEY;index++){ zak|* _  
    if(hCallWnd[index]==NULL) a'-u(Bw  
     continue; |r*)U(c`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ae2Q^yLA  
    { lYTQg~aPm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |his8\C+x  
     bProcessed=TRUE; N+ak{3  
    } 0-uw3U<  
   } XZ . T%g  
  } _6Y+E"@zs  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 lXg5UrW  
   for(int index=0;index<MAX_KEY;index++){ tYXE$ i  
    if(hCallWnd[index]==NULL) {l)$9!  
     continue; EJ>&\Iq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) fZezDm(Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6Cz O ztn  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 qVKdc*R-  
   } o K>(yC[  
  } CxTmW5l  
 } oNtoqYwH  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,sIC=V +  
} @AF<Xp{  
V^,eW!  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: gfs;?vP  
zGFD71=#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i84!x%|P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <:V~_j6P0  
tEL9hZzI  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: veHe   
w`;HwK$ ,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fz\Q>u'T  
{ UXlZI'|He  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) }b1FB<e]  
 { ":_II[FPY  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 IH;sVT $M  
  SaveBmp(); p"#\E0GM  
  return FALSE; %rMCiz  
 } =KUmvV*\  
 …… //其它处理及默认处理 a3>/B$pE  
} :{#O   
odSPl{.>d  
G0{Z@CvO'  
  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。 T#H^ }`  
!uQT4< g  
  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。 ^3TNj  
N(Ru/9!y"  
  二、编程步骤 ejlns ~  
|82q|@e  
  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"; 1!KROes4  
~PI2G 9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 9H/>M4RT  
f4h~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; R7/S SuG6\  
Xva(R<W7d<  
  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; bAPMD  
G;3%k.{  
  5、 添加代码,编译运行程序。 7-``J#9=  
4 kjfYf@A  
三、程序代码  ,\s`T O  
Z-Uu/GjB  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @QQ%09*  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) )A$"COM4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ DxV=S0P  
#if _MSC_VER > 1000 ${MzO i  
#pragma once x-m*p^}  
#endif // _MSC_VER > 1000 T@tsM|pI  
#ifndef __AFXWIN_H__ (T_-`N|  
#error include 'stdafx.h' before including this file for PCH ~=*o  
#endif 3uocAmY  
#include "resource.h" // main symbols z.Ic?Wz7  
class CHookApp : public CWinApp bGCC?}\  
{ ==OUd6e}  
 public: /)6T>/  
  CHookApp(); &t^*0/~  
  // Overrides -67Z!N  
  // ClassWizard generated virtual function overrides UDh \%?j  
  //{{AFX_VIRTUAL(CHookApp) (N}-]%#  
 public: ~;3yjO)l?)  
  virtual BOOL InitInstance(); z'U.}27&o  
  virtual int ExitInstance(); vN'+5*Cgy6  
  //}}AFX_VIRTUAL y#j7vO  
  //{{AFX_MSG(CHookApp) 4<i#TCGex3  
  // NOTE - the ClassWizard will add and remove member functions here. XI\Slq  
  // DO NOT EDIT what you see in these blocks of generated code ! Jh3  
  //}}AFX_MSG P |t yyjO  
  DECLARE_MESSAGE_MAP() >$JE!.p%o  
}; Y(g_h:lf,]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Z 2N6r6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Vr EGR$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w$:\!FImx  
BOOL InitHotkey(); [kg?q5F)  
BOOL UnInit(); In1W/ ?  
#endif ;OlnIxH(W  
1'qXT{f/~  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~.: { Ik]  
#include "stdafx.h" 1.du#w  
#include "hook.h" /_0B5 ,6R  
#include <windowsx.h> ?6CLUu|7n  
#ifdef _DEBUG R iLl\S#  
#define new DEBUG_NEW '#7k9\  
#undef THIS_FILE QPVi& *8_  
static char THIS_FILE[] = __FILE__; N4vcd=uG#  
#endif EB}B75)x  
#define MAX_KEY 100 a;xeHbE  
#define CTRLBIT 0x04 SZF 8InyF  
#define ALTBIT 0x02 ^2~ZOP$A  
#define SHIFTBIT 0x01 p AOKy  
#pragma data_seg("shareddata") YB"gLv?  
HHOOK hHook =NULL; TcaW'&(K  
UINT nHookCount =0; 6Qkjr</  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ,`bW (V  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT },8|9z#pyB  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey NftnbsTmy  
static int KeyCount =0; "z{/*uM2<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @P7'MiP]K  
#pragma data_seg() (%X *b.n=  
HINSTANCE hins; 1kvX#h&V  
void VerifyWindow(); FOQ-KP\ =,  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 5-X$"Z|@  
//{{AFX_MSG_MAP(CHookApp) }|Qh+{H*.  
// NOTE - the ClassWizard will add and remove mapping macros here. cy8>M))c  
// DO NOT EDIT what you see in these blocks of generated code! 8J3#(aBm  
//}}AFX_MSG_MAP "du(BZw  
END_MESSAGE_MAP() m^QoB  
_<(xjWp 8  
CHookApp::CHookApp() 2nyK'k  
{ G<?RH"RZr  
 // TODO: add construction code here, peVY2\1>R  
 // Place all significant initialization in InitInstance cg8/v:B  
} JTKS5 r7?  
05 6K)E  
CHookApp theApp; 5nx*D"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) epsRv&LfC  
{ KNeVSZT  
 BOOL bProcessed=FALSE; h>`[p,o  
 if(HC_ACTION==nCode) H1k)ya x4_  
 { -s 0SQe{!_  
  if((lParam&0xc0000000)==0xc0000000){// Key up zIF1A*UH  
   switch(wParam) %@PcQJg U<  
   { N/o?\q8  
    case VK_MENU: dHY@V> D'-  
     MaskBits&=~ALTBIT; PA^*|^;Xh  
     break; QZVyU8j3  
    case VK_CONTROL: HIc;Lc8$  
     MaskBits&=~CTRLBIT; Z;uKnJh  
     break; zeMV_rW~  
    case VK_SHIFT: @ym:@<D  
     MaskBits&=~SHIFTBIT; nk|(cyt)  
     break; C1;uAw?\  
    default: //judge the key and send message <9]"p2  
     break; 2E-Kz?,:[  
   } TgcCR:eL=  
   for(int index=0;index<MAX_KEY;index++){ 1'hpg>U  
    if(hCallWnd[index]==NULL) wo&IVy@s$  
     continue; "o- -MBq4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (f&V 7n  
    { +PYV-@q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /(~ HHNnh  
     bProcessed=TRUE; Nf4@m|#  
    } 791v>h    
   } I%4eX0QY=z  
  } dcrvEc_/  
  else if((lParam&0xc000ffff)==1){ //Key down =#2%[kGq  
   switch(wParam) NN7KwVg  
   { - k0a((?  
    case VK_MENU: D\G 8p;  
     MaskBits|=ALTBIT; =_OJ 7K'  
     break; r3Ol?p  
    case VK_CONTROL: YHN6/k7H  
     MaskBits|=CTRLBIT; f4S}Nga(  
     break; oT}$N_gFT  
    case VK_SHIFT: d[h=<?E5  
     MaskBits|=SHIFTBIT; t 9(,JC0  
     break; q,sO<1wAT\  
    default: //judge the key and send message D!* SA  
     break; CRo @+p10  
   } QO$18MBcc  
   for(int index=0;index<MAX_KEY;index++) <@M5 C -hH  
   { ^h_rE |c  
    if(hCallWnd[index]==NULL) KYTXf+oh  
     continue; Zdrniae ah  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e[fld,s  
    { i`i`Hu>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); htYfIy{5w  
     bProcessed=TRUE; =4)8a"7#.  
    } w%wVB/(  
   } %Ok#~>c  
  } 67/@J)z0%  
  if(!bProcessed){ PdKcDKJ  
   for(int index=0;index<MAX_KEY;index++){ */{y%  
    if(hCallWnd[index]==NULL) MZ)lNU l  
     continue; R UCUEo63  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =?CIC%6m  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .P8m%$'N  
   } k'X"jon  
  } xRZ K&vkKE  
 } "X<V>q$0~c  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p+Yy"wH:h{  
} iu=@ h>C  
 =glG |  
BOOL InitHotkey() + $M<ck?Bo  
{ XFFm 'W6@  
 if(hHook!=NULL){ Cno[:iom  
  nHookCount++; y@}WxSK*0  
  return TRUE; 9|jMN j]vo  
 } l/?bXNt  
 else Zc";R!At  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Nl4uQ_"  
  if(hHook!=NULL) .D7Gog3^<  
   nHookCount++; #}6~>A  
  return (hHook!=NULL); 7yG%E  
} rXSw@pqZ&  
BOOL UnInit() hB 'rkjt  
{ k'v+/6 Y  
 if(nHookCount>1){ mb'{@  
  nHookCount--; ^!m%:r7Dr  
  return TRUE; l(MjLXw5  
 } W^W.* ?e`  
 BOOL unhooked = UnhookWindowsHookEx(hHook); D!,'}G #  
 if(unhooked==TRUE){ 0}Kyj"-3  
  nHookCount=0; Nt tu)wr  
  hHook=NULL; shLMj)7!  
 } >d;U>P5.  
 return unhooked; O>*Vo!z\f  
} ,jnaa(n  
V%*91t_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r{* Qsaw  
{ bz1`f>%l  
 BOOL bAdded=FALSE; 'Q* .[aJt  
 for(int index=0;index<MAX_KEY;index++){ lNe5{'OrO  
  if(hCallWnd[index]==0){ "Z';nmv'N  
   hCallWnd[index]=hWnd; f. h3:_r  
   HotKey[index]=cKey; $U&p&pgH=W  
   HotKeyMask[index]=cMask; .' v$PEy  
   bAdded=TRUE; Gp_flGdGQ  
   KeyCount++; i1{)\/f3  
   break; 4<EC50@.  
  } Ga^:y=m  
 } "6~+ -_:  
 return bAdded; A{3nz DLI  
} ]:#W$9,WL  
h1Y^+A_  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tPk> hzW  
{ ^S|}<6~6b  
 BOOL bRemoved=FALSE; p=[I;U-#H  
 for(int index=0;index<MAX_KEY;index++){ Eb'M< ZY  
  if(hCallWnd[index]==hWnd){ t@2MEo  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ N5MWMN[6aP  
    hCallWnd[index]=NULL; 2 9z@ !  
    HotKey[index]=0; XB[EJGaX  
    HotKeyMask[index]=0; B$q5/L$}  
    bRemoved=TRUE; 1n)YCSA  
    KeyCount--; Bi/E{k,  
    break; {rF9[S"h  
   } e ?Jgk$"  
  } s=R^2;^  
 } (nkiuCO  
 return bRemoved; N7q6pBA"E  
} B90fUK2g  
>qMzQw2  
void VerifyWindow()  l:a#B  
{ !h^_2IX  
 for(int i=0;i<MAX_KEY;i++){ g/!tp;e  
  if(hCallWnd!=NULL){ *I9O63  
   if(!IsWindow(hCallWnd)){ nWd;XR6|  
    hCallWnd=NULL; z@<jZM  
    HotKey=0; f(EO|d^u  
    HotKeyMask=0; 1#zD7b~  
    KeyCount--; i\>?b)a>  
   } ^= kr`5  
  } '~{kR=+  
 } 2/))Y\~  
} 4?_^7(%p  
R<r,&X?m  
BOOL CHookApp::InitInstance() n&Q0V.  
{ fndH]Yp  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); gd0a,_`M  
 hins=AfxGetInstanceHandle(); \Jwc[R&x  
 InitHotkey(); Co/04F.  
 return CWinApp::InitInstance(); 7 $dibTER  
} *y~~~ 'J/  
e\ZV^h}TQ  
int CHookApp::ExitInstance() gP!k[E ,Q8  
{ Gfep m$*%  
 VerifyWindow(); "`KT7  
 UnInit(); VTO92Eo  
 return CWinApp::ExitInstance(); nwi8>MG  
} R,l*@3Q  
#=ko4?Wr(  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file }'p*C$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) MMQ\V(C  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0Y!~xyg/  
#if _MSC_VER > 1000 I#(?xHx  
#pragma once K:$GmV9o  
#endif // _MSC_VER > 1000 3my_Gp  
EO/TuKt  
class CCaptureDlg : public CDialog *"V) h I5  
{ u&j_;Y!6  
 // Construction $%1oZ{&M  
 public: T'5MO\  
  BOOL bTray; +^$E)Ol  
  BOOL bRegistered; S<I9`k G  
  BOOL RegisterHotkey(); [1e/@eC5  
  UCHAR cKey; 'qoaMJxN`  
  UCHAR cMask; <I{Yyl^  
  void DeleteIcon(); u} [.*e  
  void AddIcon(); CSzu $Hnq  
  UINT nCount; -c[fg+L9  
  void SaveBmp(); "i%=QON`  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor HC$}KoZkC  
  // Dialog Data A4)TJY 3g  
  //{{AFX_DATA(CCaptureDlg) 5_rx$avm  
  enum { IDD = IDD_CAPTURE_DIALOG }; /vLW{%  
  CComboBox m_Key; DH])Q5  
  BOOL m_bControl; .aC/ g?U  
  BOOL m_bAlt; 7Y 4!   
  BOOL m_bShift; G#.q%Up  
  CString m_Path; ;(Z9.  
  CString m_Number; O}z-g&e.U  
  //}}AFX_DATA AZ. j>+0xx  
  // ClassWizard generated virtual function overrides F{eI[A  
  //{{AFX_VIRTUAL(CCaptureDlg) VP }To  
 public: A ? [Wfq|  
  virtual BOOL PreTranslateMessage(MSG* pMsg); MwD8a<2Dg  
 protected: LKM;T-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support QRdh2YH`  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); P\$%p-G  
  //}}AFX_VIRTUAL \ Ju7.3.  
  // Implementation PSU}fo  
 protected: Bf$` Hf6  
  HICON m_hIcon; wd2z=^S~  
  // Generated message map functions 'Z6x\p  
  //{{AFX_MSG(CCaptureDlg) gAK"ShOhG=  
  virtual BOOL OnInitDialog(); ]&"01M~+K  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); fy>~ GFk(  
  afx_msg void OnPaint(); Yo}QW;,g  
  afx_msg HCURSOR OnQueryDragIcon(); CH0Nkf  
  virtual void OnCancel(); I$ ?.9&.&  
  afx_msg void OnAbout(); =<r1sqf  
  afx_msg void OnBrowse(); XJA];9^  
  afx_msg void OnChange(); Z1U@xQj  
 //}}AFX_MSG I(qFIV+H R  
 DECLARE_MESSAGE_MAP() "8\2w]"  
}; _rW75n=3b7  
#endif d M;v39  
]9}^}U1."  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "|/Q5 *L  
#include "stdafx.h" rouaT  
#include "Capture.h" $nNCBC=  
#include "CaptureDlg.h" T:*l+<?  
#include <windowsx.h> j;EH[3  
#pragma comment(lib,"hook.lib") }(9ZME<(  
#ifdef _DEBUG ` c"  
#define new DEBUG_NEW |+Tq[5&R  
#undef THIS_FILE ?:i,%]zxC  
static char THIS_FILE[] = __FILE__; lPg?Fk7AP  
#endif -o@L"C>   
#define IDM_SHELL WM_USER+1 Cr YPcvd6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?DKY;:dZF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xk s M e  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 2k^'}7G%  
class CAboutDlg : public CDialog ]3L/8]:  
{ M AL;XcRR  
 public: sL#MYW5E  
  CAboutDlg(); e. R9:  
  // Dialog Data R#W=*cN  
  //{{AFX_DATA(CAboutDlg) G|z%T`!U1;  
  enum { IDD = IDD_ABOUTBOX }; #@P0i^pFTB  
  //}}AFX_DATA M]SeNYDy  
  // ClassWizard generated virtual function overrides D=}\]Krmay  
  //{{AFX_VIRTUAL(CAboutDlg) sA oxLI  
 protected: EvF[h:C2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v4, Dt  
  //}}AFX_VIRTUAL *$@u`nM  
  // Implementation A}(o1wuw  
 protected: FzG>iC}  
  //{{AFX_MSG(CAboutDlg) JgBC:t^\pV  
  //}}AFX_MSG rbrh;\<jM  
  DECLARE_MESSAGE_MAP() ?$VkMu$2k  
}; M<P8u`)>4H  
#g<6ISuf  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) k&17 (Tv$  
{ P[tYu:  
 //{{AFX_DATA_INIT(CAboutDlg) XfN(7d0  
 //}}AFX_DATA_INIT ^95njE`>t`  
} E[<*Al +N  
l_Zx'm  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ^ U~QQ  
{ XJ7pX1nf  
 CDialog::DoDataExchange(pDX); "6Z(0 iu:{  
 //{{AFX_DATA_MAP(CAboutDlg) \t)`Cp6,[b  
 //}}AFX_DATA_MAP ]AX3ov6z9;  
} \;JZt[  
uc/W/c u,  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |mcc?*%t8  
 //{{AFX_MSG_MAP(CAboutDlg) "egpc*|]  
 // No message handlers ?/8V%PL~$  
 //}}AFX_MSG_MAP w^N QLV S  
END_MESSAGE_MAP() ~7m+N)5  
"Cs36k  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -,2CMS#N  
: CDialog(CCaptureDlg::IDD, pParent) .aR9ulS  
{ z7TyS.z  
 //{{AFX_DATA_INIT(CCaptureDlg) 6w[EJ;=p_  
  m_bControl = FALSE; wOsg,p;\'  
  m_bAlt = FALSE; !@ {sM6U  
  m_bShift = FALSE; -F MonM  
  m_Path = _T("c:\\"); .h(iyCxP  
  m_Number = _T("0 picture captured."); <LN7+7}  
  nCount=0; *D.Ajd.G  
  bRegistered=FALSE; <,\U,jU _  
  bTray=FALSE; ^9kx3Pw?8  
 //}}AFX_DATA_INIT 4eJR=h1  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 L$,yEMCe  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); W||&Xb  
} F6aC'<#/  
KtGbpcS$f  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !;0K=~(Y^  
{ l2I%$|)d  
 CDialog::DoDataExchange(pDX); SYa O'c  
 //{{AFX_DATA_MAP(CCaptureDlg) %`YR+J/V  
  DDX_Control(pDX, IDC_KEY, m_Key); [2E(3`-u  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); h`iOs>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); <. *bJ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); l>KkAA  
  DDX_Text(pDX, IDC_PATH, m_Path); lc3Gu78 A/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ^b.#4i (v  
 //}}AFX_DATA_MAP 6[S IDOp*^  
} b`@J"E}  
7VL|\^Y`q  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) na"!"C s3  
//{{AFX_MSG_MAP(CCaptureDlg) m.<u !MI  
 ON_WM_SYSCOMMAND() Qxk& J  
 ON_WM_PAINT() o4wSt6gBcJ  
 ON_WM_QUERYDRAGICON() jcb&h@T8kv  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) |gIE$rt-~W  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hCS}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 3#Bb4\_v  
//}}AFX_MSG_MAP -:E~Z_J`  
END_MESSAGE_MAP() 3R0ioi 7  
eze%RjO}  
BOOL CCaptureDlg::OnInitDialog() 2=/-,kOL_  
{ zTc*1(^  
 CDialog::OnInitDialog(); Qj*.Z4ue  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); xF@&wg  
 ASSERT(IDM_ABOUTBOX < 0xF000); jFUpf.v2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); MpBdke$  
 if (pSysMenu != NULL) FRQ0t!b<M1  
 { ncMzHw  
  CString strAboutMenu; @\o"zU  
  strAboutMenu.LoadString(IDS_ABOUTBOX); } !y5hv!_  
  if (!strAboutMenu.IsEmpty()) LD1&8kJ*l  
  { Pc2!OQC'""  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9\c]I0)3p  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?^W1WEBm  
  } FSn3p}FVa  
 } Id&e'  
 SetIcon(m_hIcon, TRUE); // Set big icon ex6R=97uA  
 SetIcon(m_hIcon, FALSE); // Set small icon hzRKv6  
 m_Key.SetCurSel(0); *@ H\J e`  
 RegisterHotkey(); gKQV99  
 CMenu* pMenu=GetSystemMenu(FALSE); W"GW[~ h  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); eLnS1w 2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 1m#.f=u{R  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~f[ Y;  
 return TRUE; // return TRUE unless you set the focus to a control k5Fj "U  
} igW* {)h3  
-%@ah:iJ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X%3?sH  
{ H!&_Tv[  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Tjhy@3  
 { cR_pC 9z  
  CAboutDlg dlgAbout; D}LM(s3li7  
  dlgAbout.DoModal(); &K{8- t  
 } ');vc~C  
 else rQyjNh  
 { N9-7YQ`D  
  CDialog::OnSysCommand(nID, lParam); m|F1_Ggz  
 } ^6z"@+;*  
} N2"B\  
bd~m'cob>  
void CCaptureDlg::OnPaint() kS8?N`2}LV  
{ 6(rN(C  
 if (IsIconic()) T7^;!;i`X  
 { `Z8k#z'bN  
  CPaintDC dc(this); // device context for painting *=.~PR6W{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); }Sbk qd5  
  // Center icon in client rectangle pCA`OP);=  
  int cxIcon = GetSystemMetrics(SM_CXICON); IEMa/[n/  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7HBf^N.  
  CRect rect; zh*D2/ r  
  GetClientRect(&rect); FK593z  
  int x = (rect.Width() - cxIcon + 1) / 2; ?-vWNv  
  int y = (rect.Height() - cyIcon + 1) / 2; dGn 0-l'q  
  // Draw the icon eqsmv [  
  dc.DrawIcon(x, y, m_hIcon); j~G(7t  
 } rpK&OR/  
 else )N8bO I  
 { h]s~w  
  CDialog::OnPaint(); ?VmgM"'md  
 } OtmDZ.t;`  
} 9K/EteS  
 2Y23!hw  
HCURSOR CCaptureDlg::OnQueryDragIcon() |w}j!}u  
{ dN)8r  
 return (HCURSOR) m_hIcon; T7.Iqw3p  
} @$ Zh^+x!  
Z17b=x Jw  
void CCaptureDlg::OnCancel()  o+'|j#P  
{ 5P%#5Yr2  
 if(bTray) d#a/J.Z$A  
  DeleteIcon(); ~x \uZ^:  
  CDialog::OnCancel(); ypx~WXFK  
} W.MZN4=  
_huJ*W7lR  
void CCaptureDlg::OnAbout() wW1VOj=6V"  
{ {zvaZY|K"  
 CAboutDlg dlg; Nw1*);b[y  
 dlg.DoModal(); 3HpqMz  
} M7cD!s@'I  
8qg%>ZU4d  
void CCaptureDlg::OnBrowse() Lo{wTYt:J  
{ ,"(G  
 CString str; )>:~XA|?  
 BROWSEINFO bi; A}(]J!rc  
 char name[MAX_PATH];  pE)NSZ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); JM|HnyI  
 bi.hwndOwner=GetSafeHwnd(); jJ$B^Y"4  
 bi.pszDisplayName=name; !SW0iq[7j  
 bi.lpszTitle="Select folder"; <@KIDZYC  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; kt2_WW[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); =J IceLL  
 if(idl==NULL) z7bJV/f  
  return; `}l%61n0  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); tr[}F7n9  
 str.ReleaseBuffer(); Zek@xr;]  
 m_Path=str; WJh TU@'  
 if(str.GetAt(str.GetLength()-1)!='\\') ,%*UF6B M  
  m_Path+="\\"; gHBvQ1g  
 UpdateData(FALSE); 1fS&KO{a  
} >] 'oN  
kg]6q T;Y  
void CCaptureDlg::SaveBmp() J 7R(X  
{ J&>@ >47  
 CDC dc; 6+IhI?lI=  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); _w4G|j$C  
 CBitmap bm; GHcx@||C?  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5lG\ Z?  
 int Height=GetSystemMetrics(SM_CYSCREEN); at_*Zh(  
 bm.CreateCompatibleBitmap(&dc,Width,Height); MONX&$  
 CDC tdc; hi1Ial\Y  
 tdc.CreateCompatibleDC(&dc); Y0a[Lb0  
 CBitmap*pOld=tdc.SelectObject(&bm); MF4 (  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); B@&sG 5ES  
 tdc.SelectObject(pOld); Bdw33z*m  
 BITMAP btm; PlzM`g$A  
 bm.GetBitmap(&btm); ^[x cfTN  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Xkhd"Axi  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); a.Z@Z!*  
 BITMAPINFOHEADER bih; noxJr/A]  
 bih.biBitCount=btm.bmBitsPixel; eut2x7Z(c  
 bih.biClrImportant=0; iQgg[ )  
 bih.biClrUsed=0; 8@m$(I +  
 bih.biCompression=0; eUA]OF @  
 bih.biHeight=btm.bmHeight; ~i5YqH0  
 bih.biPlanes=1; 6e+'Y"v  
 bih.biSize=sizeof(BITMAPINFOHEADER); 3Tl<ST\  
 bih.biSizeImage=size; \9VF)Y.ke  
 bih.biWidth=btm.bmWidth; Q6qW?*Y  
 bih.biXPelsPerMeter=0; (4+P7Z,Nc  
 bih.biYPelsPerMeter=0; E{|B&6$[}  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); H`CID*Ji  
 static int filecount=0; V%oZT>T3  
 CString name; 0hemXvv1  
 name.Format("pict%04d.bmp",filecount++); 5[ zN M  
 name=m_Path+name; M,]|L ch  
 BITMAPFILEHEADER bfh; {JgY-#R?{(  
 bfh.bfReserved1=bfh.bfReserved2=0; \~ D(ww  
 bfh.bfType=((WORD)('M'<< 8)|'B'); WP L@v+  
 bfh.bfSize=54+size; ukSv70Ev  
 bfh.bfOffBits=54; }L_YpG7  
 CFile bf; Lb/GL\J)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ p@Y=6Bw  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 'E_~ |C  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ':vZ&  
  bf.WriteHuge(lpData,size); QhZg{v[d  
  bf.Close(); vV}w>Ap[  
  nCount++; k8w\d+!v  
 } 8z#Qp(he  
 GlobalFreePtr(lpData); pmNy=ZXx  
 if(nCount==1) >NKJ@4Y  
  m_Number.Format("%d picture captured.",nCount); x s{pGQ6Q  
 else ?R)]D:`  
  m_Number.Format("%d pictures captured.",nCount); Z>9@)wo  
  UpdateData(FALSE); ,dIev<  
} xqG<R5k>>  
bE_8NA"2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 8q[; 0  
{ &zEQbHK6  
 if(pMsg -> message == WM_KEYDOWN) Du+W7]yCl  
 { %\m"Yi]  
  if(pMsg -> wParam == VK_ESCAPE) jW'YQrj{<Y  
   return TRUE; SGAzeymw  
  if(pMsg -> wParam == VK_RETURN) h:?^0b!@  
   return TRUE; U] LDi8  
 } 5'} V`?S  
 return CDialog::PreTranslateMessage(pMsg); 1F@j?)(  
} v-{g  
UT<e/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5RP kAC  
{ [8iY0m_Qe  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ #CC5+  
  SaveBmp(); jc5[r;#  
  return FALSE; "?8)}"/f  
} |?!i},Ki;  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &W2*'$j"_  
 CMenu pop; 3z8i0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); U) J5K  
 CMenu*pMenu=pop.GetSubMenu(0); '$9o(m#  
 pMenu->SetDefaultItem(ID_EXITICON); YWFE*wQ!  
 CPoint pt; ^jL '*&l  
 GetCursorPos(&pt); R BYhU55B  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); /{^k8 Q  
 if(id==ID_EXITICON) }Pcm'o_wT  
  DeleteIcon(); Og\k5.! ,  
 else if(id==ID_EXIT) 9bM\ (s/  
  OnCancel(); Pyo|Sgk  
 return FALSE; BQ-x#[ %s  
} &`r/+B_W  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); uz8LF47@:-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) n#(pT3&  
 AddIcon(); 0,%{r.\S  
 return res; KF. {r  
} 4{P+p!4  
"_{NdV|a  
void CCaptureDlg::AddIcon() /I%z7f91O  
{ n4K!Wv&u  
 NOTIFYICONDATA data; \Vyys[MMY8  
 data.cbSize=sizeof(NOTIFYICONDATA); #<*Vc6pC  
 CString tip; AC,RS 7  
 tip.LoadString(IDS_ICONTIP); -o ).<&#  
 data.hIcon=GetIcon(0); FdU]!GO- X  
 data.hWnd=GetSafeHwnd(); Gw*Tz"  
 strcpy(data.szTip,tip); {&51@UX  
 data.uCallbackMessage=IDM_SHELL; /(dP)ysc  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; '~[8>Q>  
 data.uID=98; 5J5?cs-!  
 Shell_NotifyIcon(NIM_ADD,&data); w#"\*SKK  
 ShowWindow(SW_HIDE); ^tB 1Nu %  
 bTray=TRUE; #Bd]M#J17a  
} bZnOX*y]  
5hrI#fpOR  
void CCaptureDlg::DeleteIcon() H"A%mrb  
{ >e;-$$e  
 NOTIFYICONDATA data; qRt!kWW  
 data.cbSize=sizeof(NOTIFYICONDATA); +?_!8N8  
 data.hWnd=GetSafeHwnd(); >US*7m }  
 data.uID=98; $L/`nd  
 Shell_NotifyIcon(NIM_DELETE,&data); :{7+[LcH7  
 ShowWindow(SW_SHOW); Xg)8}  
 SetForegroundWindow(); KkJqqO"EL  
 ShowWindow(SW_SHOWNORMAL); 7Uenr9)M  
 bTray=FALSE; hG1:E:}  
} 86ao{l6lC  
 .U1wVIM  
void CCaptureDlg::OnChange() P'W} ]mCD  
{ Ln+l'&_nb  
 RegisterHotkey(); wI.aV>  
} S=UuEmU5N  
cAWn*%  
BOOL CCaptureDlg::RegisterHotkey() =xI;D,@S  
{ IKD{3cVL  
 UpdateData(); -  x  
 UCHAR mask=0; 9[0iIT$q$  
 UCHAR key=0; v] m/$X2  
 if(m_bControl) NoI|Dz  
  mask|=4; o4Q?K.9c  
 if(m_bAlt) QYH-"-)  
  mask|=2; \nl(tU#j  
 if(m_bShift) SI7rTJ]/  
  mask|=1; 3c<aI =$^  
  key=Key_Table[m_Key.GetCurSel()]; 78& |^sq  
 if(bRegistered){ "5hk%T '  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); U&^q#['  
  bRegistered=FALSE; )jM%bUk,!  
 } 8!_jZf8  
 cMask=mask; gQnr.  
 cKey=key; 3jx%]S^z|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); t~Q 9} +  
 return bRegistered; }3Es&p$9  
} Z\!,f.>g  
D!j/a!MaKk  
  四、小结 xl}rdnf}  
S=@+qcI  
  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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