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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: T.dO0$,Q@$  
  ~{!!=@6  
  一、实现方法 Cx'=2Y7  
g]Ny?61  
  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: 3VB V_/i;  
ul&7hHp_u%  
#pragma data_seg("shareddata") P(+ar#,G  
HHOOK hHook =NULL; //钩子句柄 x=+I8Q4:  
UINT nHookCount =0; //挂接的程序数目 K'/x9.'%  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 F5q1VEe  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 OHvzK8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?0&>?-?  
static int KeyCount =0; rzj'!~>U  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 >c>ar>4xF  
#pragma data_seg() w%H#>k  
G7JZP T  
  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。 L%s""nP  
3A1kH` X^q  
  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: ebVfny$D  
Bq8<FZr#!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR % 7:  
cKey,UCHAR cMask) | lfPd  
{ xT>V ;aa\  
 BOOL bAdded=FALSE; %6:2cR  
 for(int index=0;index<MAX_KEY;index++){ !_#js  
  if(hCallWnd[index]==0){ ;9sVWJJCw  
   hCallWnd[index]=hWnd; )pH{b]t  
   HotKey[index]=cKey; qz2d'OhmtH  
   HotKeyMask[index]=cMask; 7U0):11X#  
   bAdded=TRUE; u)MA#p {  
   KeyCount++; .lS6KBf@  
   break; -e\kIK %  
  } ~WLsqP5Y~a  
 } U]3JCZ{]0E  
 return bAdded; 1'B?f# s  
} qT%E[qDS  
//删除热键  >S/>2e:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Bqgw%_  
{ %.Y`X(g6/  
 BOOL bRemoved=FALSE; \MPy"uC  
 for(int index=0;index<MAX_KEY;index++){ Ob+c*@KiW  
  if(hCallWnd[index]==hWnd){ YI+|6s[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7w({ GZ  
    hCallWnd[index]=NULL; (<-0UR]%q;  
    HotKey[index]=0; { ,srj['RS  
    HotKeyMask[index]=0; KWMH|sxO=  
    bRemoved=TRUE; A 76yz`D  
    KeyCount--; mL+ps x+  
    break; `8Ix&d3F  
   } ~!u94_:  
  } ^PszZ10T  
 } Hc!_o`[{l  
 return bRemoved; h|Qh/jCX  
} b,`N;*  
|zlwPi.  
7.-|3Wcg  
  DLL中的钩子函数如下: CeemR>\t  
~8E rl3=5{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) VgL<uxq  
{ r]{:{Z  
 BOOL bProcessed=FALSE; ;kA2"c]m  
 if(HC_ACTION==nCode) \t3i9#Q  
 { wEyh;ID3#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [c~zO+x  
   switch(wParam) Ado>)c"*y1  
   {  !).d c.P  
    case VK_MENU: 5j %jhby?  
     MaskBits&=~ALTBIT; E2cmT$6  
     break; I.x>mN -0  
    case VK_CONTROL: %/p5C  
     MaskBits&=~CTRLBIT; K;O\Pd  
     break; ps [rYy  
    case VK_SHIFT: @m4d4K@  
     MaskBits&=~SHIFTBIT; nMqU6X>P!  
     break; e9nuQ\=  
    default: //judge the key and send message $ :/1U$  
     break; S7]cF5N  
   } *2Kte'+q  
   for(int index=0;index<MAX_KEY;index++){ oizoKwp%  
    if(hCallWnd[index]==NULL) Dc5XU3Eu`  
     continue; T%F'4_~No  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i=rW{0c%  
    { 6iOAYA=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); HH+XEMP/g  
     bProcessed=TRUE; J<D =\  
    } iFnM6O$(  
   } hw1s^:|+2  
  } bK7DGw`1  
  else if((lParam&0xc000ffff)==1){ //有键按下 8cl!8gfv  
   switch(wParam) }z6HxB]$  
   { Y|bGd_j  
    case VK_MENU: F{S.f1Bsp  
     MaskBits|=ALTBIT; `Jo}/c 5R  
     break; $onliW|  
    case VK_CONTROL: 3/ D fsv  
     MaskBits|=CTRLBIT; 7}MWmS^8j  
     break; ~ i,my31  
    case VK_SHIFT: &x}JC/u]fd  
     MaskBits|=SHIFTBIT;  E2l.  
     break; 08Gr  
    default: //judge the key and send message ?Z"}RMM)8  
     break; wlJ_, wA  
   }  GU9`;/  
   for(int index=0;index<MAX_KEY;index++){ 2 q>4nN  
    if(hCallWnd[index]==NULL) dpS  
     continue; wP'`!O[W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `*B8IT)  
    { BehV :M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lB3X1e9  
     bProcessed=TRUE; D  UeT  
    } &yuerNK  
   } ZsE8eD  
  } 7u;B[qH  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 #HML=qK~  
   for(int index=0;index<MAX_KEY;index++){ U]d+iz??b  
    if(hCallWnd[index]==NULL) Ek:u[Uw\  
     continue; 1*5n}cU~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8EQ;+V  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |2 Dlw]d  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 mdwY48b  
   } & b%6pVj  
  } -kkXyO8js  
 } 5:6mptn>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Gl+}]Vn[n  
} W'[!4RQL  
H 74hv`G9  
  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: HO' HkVA  
q /#O :Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m1TPy-|1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w ^A0l.{  
kG E|17I  
  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: ZyTah\yPM  
UV=TU=A\o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) X6PfOep  
{ ;^;5"n h  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) k,H4<")H  
 { T]+*} C  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ]HRE-g  
  SaveBmp(); 4h|D[Cb]  
  return FALSE; %j'lWwi  
 } <1ai0]  
 …… //其它处理及默认处理 s;A]GJ  
} wM><DrQ  
=w8*n2  
>k:)'*  
  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。 wH<S0vl   
n_5g:`Y  
  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。 tZ(Wh  
/(Y\ <  
  二、编程步骤 Bk8U\Ut  
*H;&hq  
  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"; SN11J+  
Z:'2pu U+?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;  d(k`Yk8  
i+2J\.~U#G  
  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; 1 %*X,E  
D}:D,s8UP  
  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; SN+&'?$WD  
j,Mp["X&  
  5、 添加代码,编译运行程序。 7I HWj<  
_ TUw0:&  
三、程序代码 vWow^g  
M jHeUf  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ]TGJ|X  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) :D&QGw(n  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ^  K/B[8  
#if _MSC_VER > 1000 `W"-jz5#=  
#pragma once UF}fmDi  
#endif // _MSC_VER > 1000 WS;3a}u  
#ifndef __AFXWIN_H__ 8z@A/$T  
#error include 'stdafx.h' before including this file for PCH ,2u]rLxx;  
#endif y:1?~R  
#include "resource.h" // main symbols qoOHWh&  
class CHookApp : public CWinApp Yd]f}5F  
{ v%_sCg  
 public: sH6srwI  
  CHookApp(); bMgp  
  // Overrides E]Kd`&^}  
  // ClassWizard generated virtual function overrides kQ|}"Tw7  
  //{{AFX_VIRTUAL(CHookApp) |s|RJA1  
 public: X~lOFH;}q  
  virtual BOOL InitInstance(); sW[42A  
  virtual int ExitInstance(); i3YAK$w;&  
  //}}AFX_VIRTUAL aX0sy\Z]j  
  //{{AFX_MSG(CHookApp) 1V)0+_Yv  
  // NOTE - the ClassWizard will add and remove member functions here. qD 2<-E&M/  
  // DO NOT EDIT what you see in these blocks of generated code ! K?P.1H`  
  //}}AFX_MSG (RGl, x:  
  DECLARE_MESSAGE_MAP() lnTl"9F  
}; aFKks .n3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Il!iqDHz3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Dz.U&+*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^ 3Vjmv  
BOOL InitHotkey(); l46O=?usDX  
BOOL UnInit(); d@`yRueWiV  
#endif #~(@Ka.eA0  
IDv@r\Xw  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ; <3w ,r  
#include "stdafx.h" dBCg$Rud&  
#include "hook.h" (/PD;R$b  
#include <windowsx.h> 6Ba>l$/q  
#ifdef _DEBUG @Yy=HV  
#define new DEBUG_NEW Jg^tr>I~  
#undef THIS_FILE SxMh '  
static char THIS_FILE[] = __FILE__; I#9A\.pO  
#endif UT"L5{c  
#define MAX_KEY 100 A9F Z`  
#define CTRLBIT 0x04 @"Do8p!*(6  
#define ALTBIT 0x02 )TG\P,H9  
#define SHIFTBIT 0x01 {d=y9Jb^  
#pragma data_seg("shareddata") V5R``T p  
HHOOK hHook =NULL; \\)3:1X  
UINT nHookCount =0; R(ay&f%E  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 2N`Vx3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT aNfgSo05@n  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (n#  
static int KeyCount =0; eD G=-a4  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift |)1"*`z  
#pragma data_seg() y=-d*E  
HINSTANCE hins; ZO:{9vt=/  
void VerifyWindow();  Q"%L  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %xL3=4\  
//{{AFX_MSG_MAP(CHookApp) POx~m  
// NOTE - the ClassWizard will add and remove mapping macros here. :N(L7&<  
// DO NOT EDIT what you see in these blocks of generated code! 61CNEzQ  
//}}AFX_MSG_MAP HnZr RHT 0  
END_MESSAGE_MAP() {{:MJ\_"h_  
("wPkm^  
CHookApp::CHookApp() CEt_wKz f  
{ |(Io(e  
 // TODO: add construction code here, \U p<m>3\  
 // Place all significant initialization in InitInstance I5PaY.i  
} W&6ye  
@zSoPDYv,  
CHookApp theApp; H`m| R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) dc"Vc 3)  
{ HA"LU;5>2J  
 BOOL bProcessed=FALSE; DH @*Oz-  
 if(HC_ACTION==nCode) L<J%IlcfO  
 { .GLotc  
  if((lParam&0xc0000000)==0xc0000000){// Key up {P(IA2J'S  
   switch(wParam) zaR~fO  
   { (eG#JVsm9  
    case VK_MENU: [K%J t  
     MaskBits&=~ALTBIT; [JsQ/|=z  
     break; lLo FM  
    case VK_CONTROL: XgU]Ktl  
     MaskBits&=~CTRLBIT; 2= u5N[*  
     break; 4d[:{/+Q  
    case VK_SHIFT: h?fv:^vSi  
     MaskBits&=~SHIFTBIT; i5V ly'Q  
     break; Pqx=j_st  
    default: //judge the key and send message ]'M Ly#9  
     break; Va?wG3w  
   } znX2W0V  
   for(int index=0;index<MAX_KEY;index++){ L<5go\!bV  
    if(hCallWnd[index]==NULL) CQ6Z[hLWF  
     continue; k2p{<SO;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GXJJOy1"!  
    { ln#Lx&r;|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); A.*}<  
     bProcessed=TRUE; TE^BfAw@  
    } xs+MvXTC  
   } : !J!l u  
  } kQwBrb 4  
  else if((lParam&0xc000ffff)==1){ //Key down EVrOu""  
   switch(wParam) =@&]PYv  
   { o=4d2V%m  
    case VK_MENU: ,]1K^UeZ  
     MaskBits|=ALTBIT; !dStl:B  
     break; 3x.|g   
    case VK_CONTROL: V1;n5YL  
     MaskBits|=CTRLBIT; a{,EX[~b  
     break; $nBzYRc"3  
    case VK_SHIFT: Q_qc_IcM y  
     MaskBits|=SHIFTBIT; -.i1l/FzP  
     break; 9kQ~)4#  
    default: //judge the key and send message B?$pIG^Mn  
     break; OT\[qaK  
   } s 3Y \,9\  
   for(int index=0;index<MAX_KEY;index++) [gQ*y~N  
   { }=az6cLE2  
    if(hCallWnd[index]==NULL) 0 B>{31)  
     continue; r68'DJ&m3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0=yKE J  
    { R/A40i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); q?e97a  
     bProcessed=TRUE; ~g~z"!K  
    } VctAQ|h^  
   } d*7 Tjs{\  
  } C/tn0  
  if(!bProcessed){ -D`*$rp,  
   for(int index=0;index<MAX_KEY;index++){ TBvv(_  
    if(hCallWnd[index]==NULL) 4Ts5*_  
     continue; 83Bp_K2\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) e(,sFhR  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r8}GiP0|  
   } (]0ZxWF  
  } wYOSaGyZ0I  
 } 8lT.2H  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  5!NK  
} km4::'(6  
f'TdYG  
BOOL InitHotkey() =uIu0_v  
{ 9^c\$"2B  
 if(hHook!=NULL){ 39BGwKXb  
  nHookCount++; khyn4   
  return TRUE; w<tr<Pu'  
 } -{-w5_B$  
 else `$fwLC3j  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); <pK72  
  if(hHook!=NULL) k#w[G L|T  
   nHookCount++; \:'=ccf  
  return (hHook!=NULL); :(!il?  
} AJI,>I,}}  
BOOL UnInit() 9=&LMjTQ  
{ ZBB^?FF  
 if(nHookCount>1){ yo#&>W  
  nHookCount--; ]b-Z;Nce  
  return TRUE; + 79?}|  
 } k]] (I<2  
 BOOL unhooked = UnhookWindowsHookEx(hHook); F]q pDv  
 if(unhooked==TRUE){ &zynfj#o  
  nHookCount=0; U(3{6^>Gc  
  hHook=NULL; XA-DJ  
 } ;SEH|_/  
 return unhooked; (sq4  
} ??CtmH  
H"N o{|^<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0~<d<a -@  
{ w q% 4'(  
 BOOL bAdded=FALSE; >u4%s7 v  
 for(int index=0;index<MAX_KEY;index++){ CVyqr_n65/  
  if(hCallWnd[index]==0){ +>@<'YI<  
   hCallWnd[index]=hWnd; EX~ U(JB6  
   HotKey[index]=cKey; q1;}~}W;z4  
   HotKeyMask[index]=cMask;  I?.$  
   bAdded=TRUE; 7xb z)FI  
   KeyCount++; wyMj^+ 2m  
   break; .Qn54tS0q  
  } ,)@Q,EHN;  
 } 3tMs61 3  
 return bAdded; Vp  .($  
} fq~ <^B  
YYzj:'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q *![u5#  
{ ?a+tL'D[  
 BOOL bRemoved=FALSE; !i&^H,  
 for(int index=0;index<MAX_KEY;index++){ OQ;DqV  
  if(hCallWnd[index]==hWnd){ DK}k||-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Hc ]/0:  
    hCallWnd[index]=NULL; >%h_ R:  
    HotKey[index]=0; %fGS< W;  
    HotKeyMask[index]=0; #joGIw  
    bRemoved=TRUE; ZqsI\"bj  
    KeyCount--; CLg;  
    break; >?ZH[A  
   } h3$.` >l  
  } U N1HBW;  
 } : |#Iw  
 return bRemoved; q+>J'UGb  
} %=xR$<D  
o$FqMRep  
void VerifyWindow() )q&=x2`  
{ s? @{  
 for(int i=0;i<MAX_KEY;i++){ HF" v \  
  if(hCallWnd!=NULL){ {w$1_GU  
   if(!IsWindow(hCallWnd)){ 7hqa|  
    hCallWnd=NULL; %3M(!X:[  
    HotKey=0; t,4q]Jt  
    HotKeyMask=0; \Lv eZ_h5  
    KeyCount--; ~@S5*(&8  
   } b*LEoQSl0V  
  } >:%i,K*AM  
 } M;V (Tf  
} *A':^vgk  
H[#s&Fk2  
BOOL CHookApp::InitInstance() US A!N  
{ X2hV)8Sk  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); x]&V7Y   
 hins=AfxGetInstanceHandle(); $`W .9  
 InitHotkey(); U$@p"F@P  
 return CWinApp::InitInstance(); 5M4mFC6  
} "K5n|{#  
x48Y#"'  
int CHookApp::ExitInstance() L:"i,K#P  
{ eN fo8xUG  
 VerifyWindow(); b*S :wfw  
 UnInit(); ,'?%z>RZm  
 return CWinApp::ExitInstance(); 7^P!@o$v!  
} Pou-AzEP$  
F2WUG  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file )T/"QF}<T  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) R ,-y  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9!zUv:;  
#if _MSC_VER > 1000 2siUpmX  
#pragma once Gnop  
#endif // _MSC_VER > 1000 !:PF |dZ  
FVNxjMm,  
class CCaptureDlg : public CDialog R| [mp%Q  
{ Y [k%<f  
 // Construction 4vq,W_n.hQ  
 public: xwhH_[  
  BOOL bTray; 2qLRcA=R  
  BOOL bRegistered; SV}q8z\  
  BOOL RegisterHotkey(); p(in.Xz  
  UCHAR cKey; 9oKRn c  
  UCHAR cMask; JG @bl  
  void DeleteIcon(); rT9<_<  
  void AddIcon(); uUu]JDdz  
  UINT nCount; ?W-J2tgss{  
  void SaveBmp(); [0U!Y/?6lA  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;A7HEx  
  // Dialog Data Ymkk"y.w  
  //{{AFX_DATA(CCaptureDlg) r\Nf309~  
  enum { IDD = IDD_CAPTURE_DIALOG }; 3CK4a,]Dm  
  CComboBox m_Key; _doX&*9u  
  BOOL m_bControl; dIgaw;Ch]  
  BOOL m_bAlt; /_ }xTP"9  
  BOOL m_bShift; GzxtC  &  
  CString m_Path; [ R1S+i  
  CString m_Number; -f IX6  
  //}}AFX_DATA t"k6wv;Tq  
  // ClassWizard generated virtual function overrides Fn.wd`'0  
  //{{AFX_VIRTUAL(CCaptureDlg) E,&BP$B  
 public: zim]3%b*A;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ^Lr)STh  
 protected: Y+ 75}]B  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DP**pf%j  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "W$,dWF  
  //}}AFX_VIRTUAL fx(^}e  
  // Implementation =$;i  
 protected: 6<jh0=$  
  HICON m_hIcon; 4^vEMq8lB  
  // Generated message map functions ;M}'\.  
  //{{AFX_MSG(CCaptureDlg) d%VG@./xq  
  virtual BOOL OnInitDialog(); T8+A`z=tSb  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); . #`lW7  
  afx_msg void OnPaint(); ;Nf5,D.D  
  afx_msg HCURSOR OnQueryDragIcon(); rt)70=  
  virtual void OnCancel(); &^$dHr6v  
  afx_msg void OnAbout(); fr kDf-P  
  afx_msg void OnBrowse(); Sd/?xyF1(  
  afx_msg void OnChange(); d~@&*1}  
 //}}AFX_MSG -jy- KC  
 DECLARE_MESSAGE_MAP() .^j6  
}; X-&t!0O4}`  
#endif # le<R  
|fnP@k  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >ly`1t1  
#include "stdafx.h" }la\?I  
#include "Capture.h" m`C c U`s  
#include "CaptureDlg.h" 4UD<g+|  
#include <windowsx.h> :#W40rUb  
#pragma comment(lib,"hook.lib") xp-.,^q\w  
#ifdef _DEBUG nTxeV%  
#define new DEBUG_NEW  *X- 6]C  
#undef THIS_FILE 0Ou;MU*v  
static char THIS_FILE[] = __FILE__; H1X38  
#endif spter35b[  
#define IDM_SHELL WM_USER+1 SRs1t6&y=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Y-\/Y*;cd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4#Wczk-b  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1H sfCky{  
class CAboutDlg : public CDialog d\&{Ev9v  
{ (8DJf"}  
 public: h.CbOI%Q  
  CAboutDlg(); dU%Q=r8R  
  // Dialog Data j f25Ky~  
  //{{AFX_DATA(CAboutDlg) ]G.ttfC  
  enum { IDD = IDD_ABOUTBOX }; :ad  
  //}}AFX_DATA +k|t[N  
  // ClassWizard generated virtual function overrides K s 8  
  //{{AFX_VIRTUAL(CAboutDlg) G?D7R/0)  
 protected: l",JN.w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *6D0>F  
  //}}AFX_VIRTUAL _aa3;kT_  
  // Implementation KP{|xQ>  
 protected: feM%-  
  //{{AFX_MSG(CAboutDlg) T\7z87Q  
  //}}AFX_MSG BUT{}2+K  
  DECLARE_MESSAGE_MAP() 2@K D '^(  
}; _h|rH   
~/Gx~P]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) R~OameRR  
{ LV|ZZ.d h  
 //{{AFX_DATA_INIT(CAboutDlg) wBz?OnD/D  
 //}}AFX_DATA_INIT IB9[Lx  
} a+A^njk  
+oa\'.~?  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,#&\1Vxf  
{ KwGk8$ U  
 CDialog::DoDataExchange(pDX); gB/4ro8  
 //{{AFX_DATA_MAP(CAboutDlg) f P'qUN  
 //}}AFX_DATA_MAP 7u[U%yd  
} cQ( zBf  
&)jBr^x#>  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4q sIJJ[.  
 //{{AFX_MSG_MAP(CAboutDlg) x\taG.'zX  
 // No message handlers (A!+$}UR  
 //}}AFX_MSG_MAP ~ [L4,q  
END_MESSAGE_MAP() l&3f<e  
Zzy!D  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) `-a](0Q U  
: CDialog(CCaptureDlg::IDD, pParent) 2d:<P!B  
{ B-Bgk  
 //{{AFX_DATA_INIT(CCaptureDlg) ]D(!ua5|x`  
  m_bControl = FALSE; \Tq !(]o^  
  m_bAlt = FALSE; ~aKM+KmtPH  
  m_bShift = FALSE; GJ YXCi  
  m_Path = _T("c:\\"); hBb&-/  
  m_Number = _T("0 picture captured."); wdS4iQD  
  nCount=0; b=nQi./f  
  bRegistered=FALSE; fik*-$V`  
  bTray=FALSE; !RX\">z  
 //}}AFX_DATA_INIT Ay?KE{Qs '  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 B \?We\y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Yq~$Q4  
} j8Nl'"  
wz1fx>Q  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /^_~NF#  
{ &5JTcMC^  
 CDialog::DoDataExchange(pDX); [O)(0  
 //{{AFX_DATA_MAP(CCaptureDlg) g\9I&z~?  
  DDX_Control(pDX, IDC_KEY, m_Key); )P&>Tc?;z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); @JJ,$ ?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); hcWYz  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); #4hxbRN  
  DDX_Text(pDX, IDC_PATH, m_Path); tA#7Xr+  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5f5bhBZ<  
 //}}AFX_DATA_MAP ,/{(8hn  
} +?"N5%a%F  
.Up\ 0|b  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^{z@=o<o  
//{{AFX_MSG_MAP(CCaptureDlg) ]O%wZIp\P  
 ON_WM_SYSCOMMAND() E=N44[`.G  
 ON_WM_PAINT() 9A|deETa-  
 ON_WM_QUERYDRAGICON() vo48\w7[  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -+1_ 1!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) sEBZ-qql  
 ON_BN_CLICKED(ID_CHANGE, OnChange) !~X[qT  
//}}AFX_MSG_MAP J\7ukm"9  
END_MESSAGE_MAP() :|j,x7&/{  
%N((p[\H  
BOOL CCaptureDlg::OnInitDialog() &8kc0Z@y  
{ ]J<2a`IK!  
 CDialog::OnInitDialog(); SePPI.n  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [!^Q_O  
 ASSERT(IDM_ABOUTBOX < 0xF000); rHS;wT  
 CMenu* pSysMenu = GetSystemMenu(FALSE); y2"PKBK\_  
 if (pSysMenu != NULL) hN0Y8Ia/5%  
 { ?&qa3y)wX:  
  CString strAboutMenu; %V40I{1  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 4k}3^.#  
  if (!strAboutMenu.IsEmpty()) 7Jm&z/  
  { 2oY.MQD7iW  
   pSysMenu->AppendMenu(MF_SEPARATOR); (_:k s  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9VqE:c /  
  } N(*Xjy+PX  
 } N0Y$QWr_$  
 SetIcon(m_hIcon, TRUE); // Set big icon XctSw  
 SetIcon(m_hIcon, FALSE); // Set small icon . X  (^E  
 m_Key.SetCurSel(0); G)p pkH`qj  
 RegisterHotkey(); r'!HWR  
 CMenu* pMenu=GetSystemMenu(FALSE); E cS+/  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); q?R)9E$h  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); X5s.F%Np!  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); &Z kY9XO  
 return TRUE; // return TRUE unless you set the focus to a control JCL+uEX4S  
} h6Femis  
Y}db<Cz X  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5|T[:m  
{ RQaB _bg7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) pKSn 3-A  
 { to}g4  
  CAboutDlg dlgAbout; 1 _A B; ^  
  dlgAbout.DoModal(); dv?ael^  
 } [73 \jT  
 else i=m5M]Ef  
 { ,r$k79TI  
  CDialog::OnSysCommand(nID, lParam); M%*D}s-QE  
 } HR.^ y$IE  
} v|\<N!g  
yH\3*#+  
void CCaptureDlg::OnPaint() 'VgdQp$L$  
{ M @|n"(P  
 if (IsIconic()) IJWUNKqo=  
 { H2f!c{t$p  
  CPaintDC dc(this); // device context for painting = [N= mC  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x,CTB  
  // Center icon in client rectangle 79DzrLu  
  int cxIcon = GetSystemMetrics(SM_CXICON); %kS4v,I  
  int cyIcon = GetSystemMetrics(SM_CYICON); =r w60B  
  CRect rect; E_fH,YJ?9  
  GetClientRect(&rect); |E%i t?3M  
  int x = (rect.Width() - cxIcon + 1) / 2; ~0;l\^  
  int y = (rect.Height() - cyIcon + 1) / 2; Yf=an`"  
  // Draw the icon VR8 kY&  
  dc.DrawIcon(x, y, m_hIcon); HDmjt+3&n  
 } {}sF ?wZf  
 else gD13(G98  
 { uX.^zg]}%  
  CDialog::OnPaint(); e8WuAI86  
 } b" Z$?5  
} pKxsK^O5[  
IE)$ .%q;)  
HCURSOR CCaptureDlg::OnQueryDragIcon() >i6sJ)2?>  
{ l**gM  
 return (HCURSOR) m_hIcon; k-:wM`C  
} q <, b  
TFfV?rBI  
void CCaptureDlg::OnCancel() cO8':P5Q  
{ Ofx]  
 if(bTray) kp6{QKDj&  
  DeleteIcon(); 3/aK#TjK  
  CDialog::OnCancel(); 1*x;jO>Hk  
} I]4L0r-  
@r.w+E=  
void CCaptureDlg::OnAbout() lx'^vK%F  
{ }@)r\t4m  
 CAboutDlg dlg; Li'>pQ+  
 dlg.DoModal(); /?ZO-]q  
} KQf=t0Z=Ce  
m{ wk0  
void CCaptureDlg::OnBrowse() |w{}h6 a  
{ 2bs={p$}a  
 CString str; 3j I rB%  
 BROWSEINFO bi; >3C4S  
 char name[MAX_PATH]; {h}0"5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); z[cs/x  
 bi.hwndOwner=GetSafeHwnd(); c\Z.V*o  
 bi.pszDisplayName=name; >U~{WM$"Y  
 bi.lpszTitle="Select folder"; `{Jo>L .  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; a-cLy*W,~  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Lhts4D/V7  
 if(idl==NULL) rIh"MQvi[  
  return; g3Xa b  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); l.@v@T(/  
 str.ReleaseBuffer(); #`HY"-7m_  
 m_Path=str; 9a6ij*#  
 if(str.GetAt(str.GetLength()-1)!='\\') y6hb-: #1  
  m_Path+="\\"; qxQuXF>:#  
 UpdateData(FALSE); <Jf[N=  
} n@JZ2K4  
'^{:HR#i  
void CCaptureDlg::SaveBmp() +55+%oGl  
{ M+L8~BD@  
 CDC dc; zao=}j?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); mA?fCs  
 CBitmap bm; 8|"26UwD/  
 int Width=GetSystemMetrics(SM_CXSCREEN); iwXMe(k  
 int Height=GetSystemMetrics(SM_CYSCREEN); *el~sor;S  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 4:I'zR5  
 CDC tdc; ^pysoaZCT_  
 tdc.CreateCompatibleDC(&dc); svaclkT=  
 CBitmap*pOld=tdc.SelectObject(&bm); *y0=sG1+D  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); R1/h<I:  
 tdc.SelectObject(pOld); $(r/N"6)O2  
 BITMAP btm; V0/PjD,jP  
 bm.GetBitmap(&btm); Q,m&XpZ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; J#*%r)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); rRQKW_9mB  
 BITMAPINFOHEADER bih; O a%ZlEUF  
 bih.biBitCount=btm.bmBitsPixel; 8Y,imj\(v  
 bih.biClrImportant=0; xU!eT'Y  
 bih.biClrUsed=0; 0! W$Cz[  
 bih.biCompression=0; /Xm4%~b_gj  
 bih.biHeight=btm.bmHeight; MS~+P'  
 bih.biPlanes=1; TPF5?  
 bih.biSize=sizeof(BITMAPINFOHEADER); @}<b42  
 bih.biSizeImage=size; S]x\Asj;w  
 bih.biWidth=btm.bmWidth; `3e>JIl"0  
 bih.biXPelsPerMeter=0; Wb%t6N?  
 bih.biYPelsPerMeter=0; Pm/Rc  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _)U.5f<   
 static int filecount=0; $`&zIz  
 CString name; y2o~~te  
 name.Format("pict%04d.bmp",filecount++); A-&XgOL  
 name=m_Path+name; ^2a63_  
 BITMAPFILEHEADER bfh; 2X,`t%o  
 bfh.bfReserved1=bfh.bfReserved2=0; KNG7$icG  
 bfh.bfType=((WORD)('M'<< 8)|'B'); NVX@1}  
 bfh.bfSize=54+size; 'JRYf;9c  
 bfh.bfOffBits=54; >X_5o^s2s  
 CFile bf; =#>F' A  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ }{S+C[:_  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); h0aK}`/a  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0}3Xry,{  
  bf.WriteHuge(lpData,size); VK>Cf>  
  bf.Close(); (Zoopkxw  
  nCount++; P;U(2;9 N  
 } )Y &RMYy  
 GlobalFreePtr(lpData); I /z`)  
 if(nCount==1) GO]5~ 4k  
  m_Number.Format("%d picture captured.",nCount); 4de:hE   
 else "j/jhe6  
  m_Number.Format("%d pictures captured.",nCount); AF\gB2^  
  UpdateData(FALSE); Db K(Rh_ K  
} Yv/T6z@  
.z, ot|  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )>(ZX9diV  
{ 045_0+r"@  
 if(pMsg -> message == WM_KEYDOWN) `LOW)|6r`  
 { sXwa`_{  
  if(pMsg -> wParam == VK_ESCAPE) F #)@ c  
   return TRUE; E<[ Y KY  
  if(pMsg -> wParam == VK_RETURN) fZavZ\qU  
   return TRUE; P47x-;  
 } eXAJ%^iD  
 return CDialog::PreTranslateMessage(pMsg); Q#5~"C  
} ;J,`v5z0:  
7V2xg h!W  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O?$]/d  
{ ?Q~o<%U7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ IAi|4,y_L  
  SaveBmp(); /@?lV!QiO  
  return FALSE; [.'9Sw  
} J3XrlSc  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Tn"^`\m  
 CMenu pop; uE,g|51H/  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); tF:AqR: (~  
 CMenu*pMenu=pop.GetSubMenu(0); w_P2\B^  
 pMenu->SetDefaultItem(ID_EXITICON); R.Kz nJ  
 CPoint pt; |@BX*r  
 GetCursorPos(&pt); +-:o+S`q~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ] @uuB\u  
 if(id==ID_EXITICON) 2QgD<  
  DeleteIcon(); Nj{;  
 else if(id==ID_EXIT) qH(HcsgD  
  OnCancel(); x c|1?AFj  
 return FALSE; tz9"#=}0  
} tu's]3RE  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); abw5Gz@Ag  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6xLQ  
 AddIcon(); wpg7xx!  
 return res; Ot{~mMDp  
} 5><T#0W?  
f0{j/+F_o  
void CCaptureDlg::AddIcon() xri(j,mU  
{ k\X yR4r  
 NOTIFYICONDATA data; 8RT<?I^5  
 data.cbSize=sizeof(NOTIFYICONDATA); Gdz*   
 CString tip; p$}/~5b}4  
 tip.LoadString(IDS_ICONTIP); t=fr`|!  
 data.hIcon=GetIcon(0); w!jY(WK U  
 data.hWnd=GetSafeHwnd(); PlR$s  
 strcpy(data.szTip,tip); e5d STc`  
 data.uCallbackMessage=IDM_SHELL; H 3so&_  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =~TPrO^  
 data.uID=98; ?&=JGk^eJ  
 Shell_NotifyIcon(NIM_ADD,&data); "?^#+@LV  
 ShowWindow(SW_HIDE); M<r]a{Yv  
 bTray=TRUE; Gkm {b[  
} W~FU!C?]  
*|ef#-|D  
void CCaptureDlg::DeleteIcon() 1&RB=7.h  
{  Vqr]Ui  
 NOTIFYICONDATA data; ar _@"+tZ  
 data.cbSize=sizeof(NOTIFYICONDATA); jLn|zK  
 data.hWnd=GetSafeHwnd(); !JtM`x/yR  
 data.uID=98; B,] AfH  
 Shell_NotifyIcon(NIM_DELETE,&data); 3oV2Ek<d  
 ShowWindow(SW_SHOW); 3+&k{UZjt  
 SetForegroundWindow(); t +|t/1s2  
 ShowWindow(SW_SHOWNORMAL); &F8*>F^7  
 bTray=FALSE; v]#[bqB.b  
} i>KgkRZL#  
P#}vi$dZ  
void CCaptureDlg::OnChange() [#(',~lN7  
{ ux~=}{tz  
 RegisterHotkey(); `Hqgahb{P  
} Wm4C(y@  
&Im-@rV!  
BOOL CCaptureDlg::RegisterHotkey() )J?8"+_Y  
{ ]X> I(p@  
 UpdateData(); BO2s(8  
 UCHAR mask=0; R$`%<Y3)  
 UCHAR key=0; xDNXI01o  
 if(m_bControl) @hwNM#>`  
  mask|=4; <{j;']V;  
 if(m_bAlt) OC)=KV@KE  
  mask|=2; `I8ep=VZ  
 if(m_bShift) vSR5F9  
  mask|=1; mkq246<D~  
  key=Key_Table[m_Key.GetCurSel()]; mWU d-|Ul  
 if(bRegistered){ UW1i%u k  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); RL[F 9g  
  bRegistered=FALSE; bB)$=7\  
 } >7r%k,`  
 cMask=mask; #/5eQTBD  
 cKey=key; vdigw.=z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); qHvU4v  
 return bRegistered; i-?mghe8  
} { <1uV']x  
4 !m'9  
  四、小结 4I9Yr  
2Bi?^kQ#  
  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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