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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: D *LZ_  
  ] &G5/ ]f  
  一、实现方法 < m9O0  
BxZop.zwE(  
  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: vCpi|a_eCu  
am"/Anml|  
#pragma data_seg("shareddata") *10e)rzM  
HHOOK hHook =NULL; //钩子句柄 SV\x2^Ea0  
UINT nHookCount =0; //挂接的程序数目 s` 9zW,  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 *!s4#|h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 z ~VA#8>  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey f1~3y}7^Jq  
static int KeyCount =0; [#9ij3vxd  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 C,I N+@  
#pragma data_seg() Gg.w-&  
v"F0$c  
  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。 {YGz=5^  
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  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: 3mm`8!R  
IYQYW.`ly  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Dh9-~}sW'  
cKey,UCHAR cMask) wyc,Ir  
{ l[fNftT-  
 BOOL bAdded=FALSE; %MjPQ  
 for(int index=0;index<MAX_KEY;index++){ yh0|f94m  
  if(hCallWnd[index]==0){ %*19S.=l  
   hCallWnd[index]=hWnd; }zobIfIF  
   HotKey[index]=cKey; &J~S  $  
   HotKeyMask[index]=cMask; %~W}262  
   bAdded=TRUE; ?&GMp[  
   KeyCount++; f^%E]ki  
   break; y1 }d(%  
  } y2qESAZ%k}  
 } SY$%!! @R  
 return bAdded; cLYc""=  
} VmUM _Q~  
//删除热键 f<}!A$wd  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n]$vCP  
{ |@@mq!>-  
 BOOL bRemoved=FALSE; <HzAh<_@F  
 for(int index=0;index<MAX_KEY;index++){ \YKh'|04  
  if(hCallWnd[index]==hWnd){ PCLSY8N  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =:g^_Hy  
    hCallWnd[index]=NULL; 9nG] .@ H  
    HotKey[index]=0; $>h#|?*?  
    HotKeyMask[index]=0; K4F!?#  
    bRemoved=TRUE; ~lF lv+,%  
    KeyCount--; zgRP!q<9tt  
    break; I?Zs|A  
   } vXnpx}B  
  } 3=<iGX"z  
 } #P4dx'vm  
 return bRemoved; 52["+1g\  
} a[$.B2U  
5{u6qc4FW  
G4{qWa/  
  DLL中的钩子函数如下: 2s4=%l  
ipzUF o<w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) u:S@'z>  
{ &=?`;K  
 BOOL bProcessed=FALSE; m+m6"yE#_  
 if(HC_ACTION==nCode) "aBd0i&  
 { H3c=B /+  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 w7Pe< vT  
   switch(wParam) RYV6hp)|  
   {  Gzir>'d2'V  
    case VK_MENU: bMUIe\/v[  
     MaskBits&=~ALTBIT; rgYuF,BT.  
     break; $HXB !$d  
    case VK_CONTROL: 28)TXRr-  
     MaskBits&=~CTRLBIT; nfJ8Rt   
     break; k41la?  
    case VK_SHIFT: op|mRJBq;  
     MaskBits&=~SHIFTBIT; ~4>Xi* B  
     break; {4QOUqAu  
    default: //judge the key and send message 4y1> !~f  
     break; 7>zKW?  
   } @*uX[)  
   for(int index=0;index<MAX_KEY;index++){ 9V],X=y~  
    if(hCallWnd[index]==NULL) {''|iwLr  
     continue; B![5+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'iVo,m[yKU  
    { !U#++Zig%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B@;)$1-UT  
     bProcessed=TRUE; YEQW:r_h.S  
    } &CL|q+-  
   } osd^SnL1/5  
  } I1myuZ  
  else if((lParam&0xc000ffff)==1){ //有键按下 9_Re,h  
   switch(wParam) p\{+l;`  
   { l'W+^  
    case VK_MENU: lz)"zV  
     MaskBits|=ALTBIT;  [;=WnG  
     break; 0`!Q-G7  
    case VK_CONTROL: baNfS  
     MaskBits|=CTRLBIT; ZW?7g+P  
     break; 0v@/I<  
    case VK_SHIFT: AIm$in`P  
     MaskBits|=SHIFTBIT; F3Y>hs):7  
     break; @"I#b99  
    default: //judge the key and send message BY0|exW  
     break; ' 4~5ez|:  
   } H<;Fb;b  
   for(int index=0;index<MAX_KEY;index++){ *!'&:  
    if(hCallWnd[index]==NULL) f^)uK+:.  
     continue; +2zuIW.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O&,O:b:@  
    { xplo Fw~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9 <KtI7  
     bProcessed=TRUE; O$Vm#|$sq  
    } Su"_1~/2S  
   } lkfFAwnc  
  } k,7+=.6  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 vs1Sh?O  
   for(int index=0;index<MAX_KEY;index++){ s3-ktZ@  
    if(hCallWnd[index]==NULL) N}Ks[2  
     continue; }iSakq'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |"yf@^kdC  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); z9ShP&^4[  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 8sIrG  
   } KupMndK  
  } CjQ"oQw  
 } 5FSv"=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); , Ln   
} u- [t~-(a  
QWHy=(!  
  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: y<`?@(0$  
q.MVF]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?4ILl>*  
B#aH\$_U  
  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: EyPJvs  
{1MGb%xW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) uXLZtfu{  
{ tin|,jA =  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;a#*|vx  
 { P!y`$Ky&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 yK077zH_  
  SaveBmp(); atf%7}2  
  return FALSE; A$~xG(  
 } =u8D!AxT  
 …… //其它处理及默认处理 $W$# CTM  
} ZB[(Tv1  
g?~Tguv  
-k&{nD|  
  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。 m`$>:B  
`OP>(bU0  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 d>, V  
6B''9V:s  
  二、编程步骤 PDIclIMS'F  
m*!f%}T  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ^$IZLM?E~  
14D 7U/zer  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; irsfJUr[V  
_;:rkC fj  
  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; +%wWSZ<#  
lKEX"KQ!  
  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;  Wu!t C  
( f,J_  
  5、 添加代码,编译运行程序。 MdH97L)L.0  
23-t$y]  
三、程序代码 h/Hl?O8[  
Vd +Q:L  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5!AV!A_Jp  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) f>r3$WKj  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ rer|k<k;]G  
#if _MSC_VER > 1000 %X9b=%'+  
#pragma once \V^*44+ <!  
#endif // _MSC_VER > 1000 jJVT_8J  
#ifndef __AFXWIN_H__ C.>  
#error include 'stdafx.h' before including this file for PCH 6z3T?`}Y  
#endif Ka]@[R6e  
#include "resource.h" // main symbols Taf n:Nw}  
class CHookApp : public CWinApp xP/OsaxN  
{ MCeu0e^)  
 public: @8nLQh^  
  CHookApp(); BF36V\  
  // Overrides =4zNo3IvL+  
  // ClassWizard generated virtual function overrides vJRnBq+y  
  //{{AFX_VIRTUAL(CHookApp) ] *-;' *  
 public: mP pvZ  
  virtual BOOL InitInstance(); 1TNz&=e  
  virtual int ExitInstance(); tqf&N0*  
  //}}AFX_VIRTUAL i-,D_   
  //{{AFX_MSG(CHookApp) d=XpO*v,[  
  // NOTE - the ClassWizard will add and remove member functions here. BR36}iS;V  
  // DO NOT EDIT what you see in these blocks of generated code ! )C {h1 `  
  //}}AFX_MSG pp~3@_)b  
  DECLARE_MESSAGE_MAP() yGvDn' m  
}; Dz`k[mI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); q_T] 9d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `l/:NF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xQJIM.  
BOOL InitHotkey(); 4.|-m.a  
BOOL UnInit(); S Pn8\2Cj  
#endif =4tO0  
FaFp_P?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~uI**{  
#include "stdafx.h" {'h_'Y`bOQ  
#include "hook.h" yGiP[d|tRc  
#include <windowsx.h> W]]q=c%2  
#ifdef _DEBUG g5#CN:%f  
#define new DEBUG_NEW hH%,!tSx  
#undef THIS_FILE -J,Q;tj  
static char THIS_FILE[] = __FILE__; B0oxCc/'sZ  
#endif <%z@  
#define MAX_KEY 100 1E8H%2$ V  
#define CTRLBIT 0x04 S _!hsY  
#define ALTBIT 0x02 }:`5,b%Y_  
#define SHIFTBIT 0x01 XFW5AP  
#pragma data_seg("shareddata") r6`\d k  
HHOOK hHook =NULL; [yw%ih)  
UINT nHookCount =0; _Vjpw,  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey fVe@YqNa  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT I%@e@Dm,h  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^m*3&x8  
static int KeyCount =0; $$JIBf8  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift BhKO_wQ?:J  
#pragma data_seg() 3AURzU  
HINSTANCE hins; qZaO&"q  
void VerifyWindow(); mD7}t  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) *z0K%@M  
//{{AFX_MSG_MAP(CHookApp) +W9]ED  
// NOTE - the ClassWizard will add and remove mapping macros here. %3M95UZ2  
// DO NOT EDIT what you see in these blocks of generated code! `=79i$,,t  
//}}AFX_MSG_MAP -!c IesK;<  
END_MESSAGE_MAP() !!FR[NK  
9\ v.qo.  
CHookApp::CHookApp() 9x=3W?K:,  
{ S'o ]=&  
 // TODO: add construction code here, o{V#f_o  
 // Place all significant initialization in InitInstance b M"fk&  
} 2MuO*.9D  
d.`&0  
CHookApp theApp; HsnG4OE  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \c{R <Hh  
{ BCx!0v?9  
 BOOL bProcessed=FALSE; `<^*jB@P  
 if(HC_ACTION==nCode) u_.HPA  
 { 6xarYh(  
  if((lParam&0xc0000000)==0xc0000000){// Key up iJ)0Y~  
   switch(wParam) &<Mt=(qY1  
   { #{x5L^v>]  
    case VK_MENU: @l~7 x  
     MaskBits&=~ALTBIT; "tL2F*F"6X  
     break; zPVd(V~(T  
    case VK_CONTROL: >AG^fUArH  
     MaskBits&=~CTRLBIT; " 9@,l!  
     break; 1Bg_FPu  
    case VK_SHIFT: y"vX~LR  
     MaskBits&=~SHIFTBIT; P-'_}*wxi  
     break; "cMNdR1^,y  
    default: //judge the key and send message xuU x4,Z  
     break; S[mM4et|  
   } vZ@g@zB4o0  
   for(int index=0;index<MAX_KEY;index++){ q#N R32byF  
    if(hCallWnd[index]==NULL) aG! *WHt  
     continue; Ky kSFB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D{p5/#|r  
    { dQ9 ah  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KCUU#t|8V\  
     bProcessed=TRUE; *| YU]b;W  
    } sqpGrW.  
   } ! _{d)J  
  } \jyjQ,v)  
  else if((lParam&0xc000ffff)==1){ //Key down =&Xdm(  
   switch(wParam) ;/'|WLI9  
   { =Vb~s+YW  
    case VK_MENU: q[ ULG v  
     MaskBits|=ALTBIT; &>(gt<C$  
     break; 5 y   
    case VK_CONTROL: 6Y1J2n"  
     MaskBits|=CTRLBIT; :)IV!_>'d  
     break; cy|%sf`  
    case VK_SHIFT: SfW}"#L>5  
     MaskBits|=SHIFTBIT; d~@q%-`lA  
     break; #Qh>z%Mn^3  
    default: //judge the key and send message dl0FQNz8@B  
     break; 0xCz'mJ  
   } q8xd*--#  
   for(int index=0;index<MAX_KEY;index++) hj!+HHYSk  
   { c@R; /m:R  
    if(hCallWnd[index]==NULL) \a))  
     continue; uZIJoT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _BS 9GB  
    { 7,'kpyCj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?NG=8.p  
     bProcessed=TRUE; +=eR%|!@  
    } 51by  
   } ~W03{9(Vp8  
  } l-.(Ez*  
  if(!bProcessed){ pu4,0bw  
   for(int index=0;index<MAX_KEY;index++){ xWE8W m  
    if(hCallWnd[index]==NULL) CzVmNy)kl  
     continue; KX3KM!*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `8:Kp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $`ztiVu3  
   } ?6P.b6m}0  
  } *(QH{!-$s  
 } a1c1k}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @dgH50o[  
} WVX`<  
Qi9-z'  
BOOL InitHotkey() 3`F) AWzdr  
{ B,vOsa"x6`  
 if(hHook!=NULL){ H&4~Uo.5  
  nHookCount++; E m{aM  
  return TRUE; \9:wfLF8!  
 } (\,BxvhG=  
 else {0v*xL_O^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); p &(OZJT  
  if(hHook!=NULL) 7G9 3,dJ  
   nHookCount++; B_^]C9C|  
  return (hHook!=NULL); ^G|98yc!'  
} %Mn.e a  
BOOL UnInit() PmX2[7  
{ 1|| +6bRP  
 if(nHookCount>1){ 2/7_;_#vJ%  
  nHookCount--; {1-V]h.<J  
  return TRUE; $ uh z  
 } }#`:Qb \U  
 BOOL unhooked = UnhookWindowsHookEx(hHook); h|;qG)f^  
 if(unhooked==TRUE){ .Zmp ,  
  nHookCount=0; pz|'l:v^  
  hHook=NULL; K'5'}Lb5k  
 } p(JlvJjo  
 return unhooked; 7 s Fz?` -  
} Di5(9]o2  
$V>yXhTh  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,0N94pKy  
{ +T{'V^  
 BOOL bAdded=FALSE; #{J,kcxS  
 for(int index=0;index<MAX_KEY;index++){ 5|8^9Oe5  
  if(hCallWnd[index]==0){ sLL7]m}  
   hCallWnd[index]=hWnd; /JJw 6[ N  
   HotKey[index]=cKey; T7*wS#z)h  
   HotKeyMask[index]=cMask; !#yq@2QX  
   bAdded=TRUE; &1|?BZv  
   KeyCount++; K>/%X!RW  
   break; \2C`<h$fN  
  } _D, ;MB&7  
 } NjuiD].  
 return bAdded; R^#@lI~  
} OE`X<h4r  
=aG xg57  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) - y AQ  
{ vH[47CvG5  
 BOOL bRemoved=FALSE; Nw_@A8-r  
 for(int index=0;index<MAX_KEY;index++){ G}d-(X  
  if(hCallWnd[index]==hWnd){ m#!=3P7T  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ YB(Gk;]  
    hCallWnd[index]=NULL; Qdk6Qubi!  
    HotKey[index]=0; v`PY>c6~  
    HotKeyMask[index]=0; *Zk>2<^R  
    bRemoved=TRUE; &a0r%L()X  
    KeyCount--; g" VMeW^  
    break; dl-l"9~;  
   } b7`D|7D  
  } u{<"NR h  
 } |*5 =_vF  
 return bRemoved; OhZgcUqQ8  
} YwEpy(}hJm  
%ysZ5:X  
void VerifyWindow() CY:d`4  
{ ~uWOdm-"[  
 for(int i=0;i<MAX_KEY;i++){ 13k !'P  
  if(hCallWnd!=NULL){ (2ot5x}`j  
   if(!IsWindow(hCallWnd)){ g|X;ahTT  
    hCallWnd=NULL; g=L]S-e  
    HotKey=0; 1c4/}3*  
    HotKeyMask=0; DOS0;^f  
    KeyCount--; 0|4%4 Mt  
   } hwYQGtjF  
  } H6*^Ga  
 } H`hnEOyLp  
} xM>W2  
_ gj&$zP  
BOOL CHookApp::InitInstance() ;*TIM%6#  
{ }|OaL*|u  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "p&Y^]  
 hins=AfxGetInstanceHandle(); $@-P5WcRs  
 InitHotkey(); 3f.b\4 U  
 return CWinApp::InitInstance(); t_z>Cl^u  
} %M F;`;1  
K7knK  
int CHookApp::ExitInstance()  fE f_F r  
{ $``1PJoi  
 VerifyWindow(); !LMN[3M_  
 UnInit(); Dr&('RZ4  
 return CWinApp::ExitInstance(); 1@48BN8cm'  
} \*hrW(   
PX: '/{V  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Ks^6.)  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Y_&g="`Q  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !l?.5Pm])  
#if _MSC_VER > 1000 F_iXd/  
#pragma once -&x2&WE'  
#endif // _MSC_VER > 1000 1/1Xk,E  
'VyM{:8  
class CCaptureDlg : public CDialog Xazo 9J  
{ ok^d@zI  
 // Construction :o-,SrORM  
 public: )~4II.`%^  
  BOOL bTray; "I?Am&>'  
  BOOL bRegistered; GcIDG`RX  
  BOOL RegisterHotkey(); \6n!3FLl  
  UCHAR cKey; ZX!r1*c 6  
  UCHAR cMask; 6oaazB^L  
  void DeleteIcon(); h!~3Dw>,N  
  void AddIcon(); o+`6LKg;  
  UINT nCount; l& 4,v  
  void SaveBmp(); ?_x q-  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor s^0/"j|7  
  // Dialog Data 4'j sDcs  
  //{{AFX_DATA(CCaptureDlg) F^"_TV0va  
  enum { IDD = IDD_CAPTURE_DIALOG }; `e9$,h|4  
  CComboBox m_Key; Q?ahr~qo  
  BOOL m_bControl; M#"524Nz  
  BOOL m_bAlt; 4a0:2 kIKa  
  BOOL m_bShift; [${ QzO  
  CString m_Path; MObt,[^W  
  CString m_Number; 'j^xbikr  
  //}}AFX_DATA ]V %.I_  
  // ClassWizard generated virtual function overrides D0k 8^  
  //{{AFX_VIRTUAL(CCaptureDlg) e0@ 6Pd  
 public: n55Pv3}C  
  virtual BOOL PreTranslateMessage(MSG* pMsg); v(*C%.M)  
 protected: 9CA^B2u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support f.aSKQD  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =9oP owq  
  //}}AFX_VIRTUAL I}e 3zf>  
  // Implementation i|w8.}0  
 protected: Wcb7 ;~K  
  HICON m_hIcon; j?y LDLj  
  // Generated message map functions 5>3}_  
  //{{AFX_MSG(CCaptureDlg) '1,,)U#6E  
  virtual BOOL OnInitDialog(); EXP%Mk/  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); U4m9e|/H;z  
  afx_msg void OnPaint(); /{wJEuE  
  afx_msg HCURSOR OnQueryDragIcon(); )1N 54FNO  
  virtual void OnCancel(); 'O5'i\uz  
  afx_msg void OnAbout(); ZX ?yL>4  
  afx_msg void OnBrowse(); D3|oOOoG  
  afx_msg void OnChange(); QM3,'?ekRH  
 //}}AFX_MSG f|^dD`  
 DECLARE_MESSAGE_MAP() 5MFxo63  
}; mRB   
#endif xe7O/',pa=  
I1[g&9,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file A7(hw~+@  
#include "stdafx.h" u` oq(?|  
#include "Capture.h" Fk(JSiU  
#include "CaptureDlg.h" j1_ @qns{  
#include <windowsx.h> <;E  
#pragma comment(lib,"hook.lib") `_b`kzJ  
#ifdef _DEBUG ;Yi4Xva@  
#define new DEBUG_NEW )jq?lw'&  
#undef THIS_FILE V"p!B f  
static char THIS_FILE[] = __FILE__; 1;Pv0&[q/  
#endif >zDF2Y[  
#define IDM_SHELL WM_USER+1 qB)"qFa  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); DI!V^M[~u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Gpm{m:$L  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; qo<&J f  
class CAboutDlg : public CDialog *x)Ozfe  
{ UzXE_ S  
 public: 2X:4CC%5  
  CAboutDlg(); +C1QY'>I  
  // Dialog Data {Fzs@,|W.  
  //{{AFX_DATA(CAboutDlg) f;}EhG'  
  enum { IDD = IDD_ABOUTBOX }; !"e5~7  
  //}}AFX_DATA Vy_2.  
  // ClassWizard generated virtual function overrides gM [w1^lj  
  //{{AFX_VIRTUAL(CAboutDlg) m*$|GW9  
 protected: ]f]<4HD=i  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8/0Y vh  
  //}}AFX_VIRTUAL n}s~+USZX  
  // Implementation 3Tn)Z1o  
 protected: 5 H#W[^s"  
  //{{AFX_MSG(CAboutDlg) \rVQQ|l   
  //}}AFX_MSG 0afei4i~N  
  DECLARE_MESSAGE_MAP() FgLrb#  
}; _fZZ_0\Q  
*^([ ~[  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ',GS#~  
{ 4t)%<4  
 //{{AFX_DATA_INIT(CAboutDlg) %pXAeeSY`;  
 //}}AFX_DATA_INIT <C9 XX~  
} [F5h   
{EdH$l>94  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0rGSH*(  
{ ' B  
 CDialog::DoDataExchange(pDX); PMfkA!.Y  
 //{{AFX_DATA_MAP(CAboutDlg) W>q HFoKa  
 //}}AFX_DATA_MAP z,{<Nm7&F  
} Q5%#^ZdsTd  
wH~kTU2br  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3Vp# a:  
 //{{AFX_MSG_MAP(CAboutDlg) 0flg=U9  
 // No message handlers Ela-,(Glk  
 //}}AFX_MSG_MAP xoOJauSX1  
END_MESSAGE_MAP() - Ij&  
rHP%0f 9:  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) &-5_f* {  
: CDialog(CCaptureDlg::IDD, pParent) _-5,zP R  
{ rp5(pV 7*  
 //{{AFX_DATA_INIT(CCaptureDlg)  BUwONF  
  m_bControl = FALSE; RxMH!^  
  m_bAlt = FALSE; ORu2V# Z[  
  m_bShift = FALSE; -{`@=U  
  m_Path = _T("c:\\"); |Yq$s U  
  m_Number = _T("0 picture captured."); c{[q>@y pK  
  nCount=0; A>{p2?`+!  
  bRegistered=FALSE; Fq9Q+RNMZL  
  bTray=FALSE; zD3mX<sw  
 //}}AFX_DATA_INIT 9<K j6t_  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +:3*  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); gIA@l `"  
} sBV 4)xM  
1Z{ZV.!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) lC=~$c:  
{ ;(}V"i7Hu  
 CDialog::DoDataExchange(pDX); 5wUUx#  
 //{{AFX_DATA_MAP(CCaptureDlg) ?8W( "W   
  DDX_Control(pDX, IDC_KEY, m_Key); g#]wLm#  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); @y31NH(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); waKT{5k  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $ "Bh]-  
  DDX_Text(pDX, IDC_PATH, m_Path); QMEcQV>  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (|wz7 AY2  
 //}}AFX_DATA_MAP R0oKbs{  
} :{(w3<i  
$<ld3[l i  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ~^+0  
//{{AFX_MSG_MAP(CCaptureDlg) W d0NT@  
 ON_WM_SYSCOMMAND() \P1=5rP  
 ON_WM_PAINT() WoxwEi1~0  
 ON_WM_QUERYDRAGICON() M4xi1M#%  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0-{t FN  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #M A4  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #[#KL/i)$  
//}}AFX_MSG_MAP m~uOXb  
END_MESSAGE_MAP() y*MF&mQ[  
f@co<iA  
BOOL CCaptureDlg::OnInitDialog() %p X6QRt?  
{ gNGr!3*)w  
 CDialog::OnInitDialog(); g R nOd  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); t#!yrQ..'G  
 ASSERT(IDM_ABOUTBOX < 0xF000);  ["}rk  
 CMenu* pSysMenu = GetSystemMenu(FALSE); T)\"Xj  
 if (pSysMenu != NULL) 2 1PFR:lP7  
 { ![f ![l  
  CString strAboutMenu; L],f3<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); :6q]F<oK  
  if (!strAboutMenu.IsEmpty()) .UoOO'1K  
  { ZIdA\_c  
   pSysMenu->AppendMenu(MF_SEPARATOR); fb  da  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); LSQz"Ll l  
  } TY(bPq  
 } r]ShZBAbYp  
 SetIcon(m_hIcon, TRUE); // Set big icon U.{l;EL:T  
 SetIcon(m_hIcon, FALSE); // Set small icon 6ksAc%|5  
 m_Key.SetCurSel(0); R>`}e+-D  
 RegisterHotkey(); 4`Ic&c/  
 CMenu* pMenu=GetSystemMenu(FALSE); sKyPosnP  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;E ec5w1  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @* il3h,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^}f -!nf[  
 return TRUE; // return TRUE unless you set the focus to a control fh^lO ^  
} @xc',I  
:R.&`4=X  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (RtueEb.~E  
{ rWh6RYd<T  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Q?AmOo-a  
 { N$[$;Fm:  
  CAboutDlg dlgAbout; lg pW@g  
  dlgAbout.DoModal(); _bD/D!|  
 } ~afg)[(  
 else q$G,KRy/  
 { jgS%1/&  
  CDialog::OnSysCommand(nID, lParam); ]59i>  
 } c]B$i*t  
} -YD+(c`l  
lO:. OZu  
void CCaptureDlg::OnPaint() jp' K%P  
{  lWm'  
 if (IsIconic()) Nm):9YQ/  
 { rxO2QQ%V  
  CPaintDC dc(this); // device context for painting fSDi- I  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~:km]?lz0  
  // Center icon in client rectangle lcV<MDS  
  int cxIcon = GetSystemMetrics(SM_CXICON); +h_ !0dG  
  int cyIcon = GetSystemMetrics(SM_CYICON); wv^rS^~  
  CRect rect; lnGq :-  
  GetClientRect(&rect); a}SdW  
  int x = (rect.Width() - cxIcon + 1) / 2; PA w-6;  
  int y = (rect.Height() - cyIcon + 1) / 2; _7DkS}NJs  
  // Draw the icon CQ;]J=|<_  
  dc.DrawIcon(x, y, m_hIcon); A8A ~!2V  
 } oUQ07z\C  
 else @Mvd'.r<;  
 { i ZL2p>  
  CDialog::OnPaint(); A[WV'!A,  
 } |#l=  
} Z>)][pL  
G;3~2^lB\  
HCURSOR CCaptureDlg::OnQueryDragIcon() zY+Fl~$S  
{ >+5?F*`\D*  
 return (HCURSOR) m_hIcon; ;V<iL?  
} DP/J (>eG  
$hxN hI  
void CCaptureDlg::OnCancel() }bU8G '  
{ /MQU >&  
 if(bTray) VDB;%U*D  
  DeleteIcon(); oPc\<$  
  CDialog::OnCancel(); 4(l?uU$  
}  htY=w}>  
C6_@\&OA  
void CCaptureDlg::OnAbout() _if|TFw;h  
{ {2`=qt2  
 CAboutDlg dlg; }6 5s'JB  
 dlg.DoModal(); qC!&x,}3  
} W(fr<<hL  
l8K5k:XCU3  
void CCaptureDlg::OnBrowse() 27ckdyQx  
{ X}P$emr7  
 CString str; >ds%].$-\  
 BROWSEINFO bi; 0tk#Gs[  
 char name[MAX_PATH]; V Cy5JH  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); I &*_,d  
 bi.hwndOwner=GetSafeHwnd(); YJxw 'U >P  
 bi.pszDisplayName=name; &/.hx(#d  
 bi.lpszTitle="Select folder"; VE2tq k%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;DnUQj  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); G= ^X1+_  
 if(idl==NULL) ,a?\M M9$  
  return; 1p`+  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); S'~o,`xy  
 str.ReleaseBuffer(); nxQ?bk}*d  
 m_Path=str; }_QKJw6/"  
 if(str.GetAt(str.GetLength()-1)!='\\') E99CmG|"  
  m_Path+="\\"; 2S`?hxAL  
 UpdateData(FALSE); 1G~S |,8p  
} aKF*FFX  
Q-rL$%~='  
void CCaptureDlg::SaveBmp() Y<\^ 7\[x  
{ 'cDx{?  
 CDC dc; zBf-8]"^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !e#xx]v3  
 CBitmap bm; ihT~xt  
 int Width=GetSystemMetrics(SM_CXSCREEN); URcR  
 int Height=GetSystemMetrics(SM_CYSCREEN); %[<Y9g,:Q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); o-7>eE}+  
 CDC tdc; !\[+99F#  
 tdc.CreateCompatibleDC(&dc); ~`Qko-a&  
 CBitmap*pOld=tdc.SelectObject(&bm); M^rM-{?<  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >95TvJ  
 tdc.SelectObject(pOld); Hg}I]!B  
 BITMAP btm; {mE! Vf  
 bm.GetBitmap(&btm); V's:>;  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; XC15K@K  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FDFH,J`_  
 BITMAPINFOHEADER bih; RaSz>-3d  
 bih.biBitCount=btm.bmBitsPixel; e2$]g>  
 bih.biClrImportant=0; .V6-(d  
 bih.biClrUsed=0; E& 36H  
 bih.biCompression=0; A CNfS9M_w  
 bih.biHeight=btm.bmHeight; 2=PBxDs;  
 bih.biPlanes=1; ghk5rl$   
 bih.biSize=sizeof(BITMAPINFOHEADER); e`{0d{Nd  
 bih.biSizeImage=size; @D`zKYwX1  
 bih.biWidth=btm.bmWidth; i`%.  
 bih.biXPelsPerMeter=0; ;)DzC c/  
 bih.biYPelsPerMeter=0; z}}]jR \y?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ]Gc3Ea;4  
 static int filecount=0; g( 0;[#@  
 CString name; P 2n2 Qt2  
 name.Format("pict%04d.bmp",filecount++); X_; *`,<T  
 name=m_Path+name; B'>*[!A  
 BITMAPFILEHEADER bfh; bm&87  
 bfh.bfReserved1=bfh.bfReserved2=0; A,~Hlw  
 bfh.bfType=((WORD)('M'<< 8)|'B'); )Du -_Z  
 bfh.bfSize=54+size; .&,[,  
 bfh.bfOffBits=54; ST1Ts5I  
 CFile bf;  *2u E  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ fUag1d  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); rlok%Rt4Z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }\v^+scD  
  bf.WriteHuge(lpData,size); 5IMSNGS  
  bf.Close(); {g/wY%u=  
  nCount++; hN`gB#N3  
 } Pn TZ/|  
 GlobalFreePtr(lpData); jeN1eM8 WI  
 if(nCount==1) B{, Bno  
  m_Number.Format("%d picture captured.",nCount); h"QbA"  
 else c|wCKn}`  
  m_Number.Format("%d pictures captured.",nCount); EiV=RdL  
  UpdateData(FALSE); j.-VJo)   
} Rag iV6c  
Z$K+ 7>^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) j~ym<-[{a  
{ g"t^r3  
 if(pMsg -> message == WM_KEYDOWN) V*B0lI7`B  
 { 4".J/I5u  
  if(pMsg -> wParam == VK_ESCAPE) .PVLWW  
   return TRUE; eVnbRT2y&  
  if(pMsg -> wParam == VK_RETURN) si/er"&o  
   return TRUE; `]2@ _wa  
 } _^uc 0=  
 return CDialog::PreTranslateMessage(pMsg); l^ 4OC  
} &R]pw`mTH  
f[/.I,9U^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >M^&F6  
{ vrcE]5(:s  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ fDuwgY0  
  SaveBmp(); q G ;-o)h  
  return FALSE; \v`#|lT$  
} |paP<$  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `\FI7s3b  
 CMenu pop; .A<sr  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +802`eax  
 CMenu*pMenu=pop.GetSubMenu(0); iV)ac\  
 pMenu->SetDefaultItem(ID_EXITICON); UC9{m252  
 CPoint pt; 6zYaA  
 GetCursorPos(&pt); (:?&G9k "  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 'tWAuI  
 if(id==ID_EXITICON) o<4D=.g7D  
  DeleteIcon(); _%IqjJO{=r  
 else if(id==ID_EXIT) <Ry $7t,  
  OnCancel(); BF|*"#s  
 return FALSE; QaMDGD  
} !P|5#.eC  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \.>.c g  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Qyj(L[KJ  
 AddIcon(); AUAI3K?  
 return res; J/S{FxNe]  
} _om[VKJd  
Ex,JB +  
void CCaptureDlg::AddIcon() N#Ag'i4HF  
{ Pf8u/?/  
 NOTIFYICONDATA data; agY5Dg7  
 data.cbSize=sizeof(NOTIFYICONDATA); _'c+fG \  
 CString tip; UvD-C?u'  
 tip.LoadString(IDS_ICONTIP); p37|zX  
 data.hIcon=GetIcon(0); xKW"X   
 data.hWnd=GetSafeHwnd(); (UzPklkZ  
 strcpy(data.szTip,tip); F"BL #g66  
 data.uCallbackMessage=IDM_SHELL; STlPT5e.}  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !QTPWA  
 data.uID=98; N*1  
 Shell_NotifyIcon(NIM_ADD,&data); *:#Z+7x ]  
 ShowWindow(SW_HIDE); %^')G+>i  
 bTray=TRUE; 8*)4"rS  
} c!~T2t  
e?vj+ZlS$f  
void CCaptureDlg::DeleteIcon() i puo}  
{ IozNjII$:.  
 NOTIFYICONDATA data; thV Tdz  
 data.cbSize=sizeof(NOTIFYICONDATA); S>EDL  
 data.hWnd=GetSafeHwnd(); E!dp~RwZu  
 data.uID=98; /hfUPO5  
 Shell_NotifyIcon(NIM_DELETE,&data); wi BuEaUkW  
 ShowWindow(SW_SHOW); fM9xy \.  
 SetForegroundWindow(); \>;%Ji  
 ShowWindow(SW_SHOWNORMAL); &E]"c]i+  
 bTray=FALSE; <{ # <5 8  
} tj#b_ u z  
[)iN)$Mv  
void CCaptureDlg::OnChange() KT=a(QL  
{ y^YVo^3  
 RegisterHotkey(); a|z1K  
} Bn_g-WrT  
f\=6I3z  
BOOL CCaptureDlg::RegisterHotkey() Cg*kN"8q  
{ H` Lu"EK  
 UpdateData(); |YXG(;-BS  
 UCHAR mask=0; [ )k2=67  
 UCHAR key=0; `OLB';D  
 if(m_bControl) ?Hk.|5A}  
  mask|=4; @|'Z@>!/pV  
 if(m_bAlt) wNR=?Z~  
  mask|=2; /gX%ABmS  
 if(m_bShift) ebD{ pc`&  
  mask|=1; 5E.vje{U;  
  key=Key_Table[m_Key.GetCurSel()]; U 5clQiow  
 if(bRegistered){ ?M]u$Te/.  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); K]MzP|T,  
  bRegistered=FALSE; Uk|9@Auav  
 } hvL6zCi  
 cMask=mask; `{WCrw6)  
 cKey=key; yW:AVqE)t  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )Kr(Y.w  
 return bRegistered; $WJy?_c  
} iI}nW  
@M9_j{A  
  四、小结 >!<V\ Fj1  
BMF3XcH~G  
  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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