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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: >!1.  
  25[I=ZdS  
  一、实现方法 MsGM5(r:b  
.:QLk&a,:,  
  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: aL&7 1^R,  
,1CIBFY  
#pragma data_seg("shareddata") !XCm>]R  
HHOOK hHook =NULL; //钩子句柄 xZwLlY  
UINT nHookCount =0; //挂接的程序数目 |! E)GahM  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 NI [ pp`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9g"2^^wD  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey i||]V*5n  
static int KeyCount =0; )MchsuF<  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 }n2M G  
#pragma data_seg() ],a5)kV  
TS9|a{j3!  
  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。 Yqi4&~?db  
B1C-J/J  
  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: d]6#m'U  
O7<]U_"I  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .1Al<OLL  
cKey,UCHAR cMask) [t@Mn  
{ wlk4*4dKn  
 BOOL bAdded=FALSE; L(-b@Joh  
 for(int index=0;index<MAX_KEY;index++){ 5Qn '  
  if(hCallWnd[index]==0){ 5}]"OXQ  
   hCallWnd[index]=hWnd; v,{yU\)  
   HotKey[index]=cKey; =~H<Z LE+  
   HotKeyMask[index]=cMask; kep/+J-u  
   bAdded=TRUE; j=aI9p  
   KeyCount++; DLMM/WJg@  
   break; uIZ-#q  
  } o`P %&  
 } \GZM&Zd  
 return bAdded; Ksj -zR;  
} z'\_jaj^  
//删除热键 {~s DYRX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A}N?/{y)G  
{ SY^t} A7:/  
 BOOL bRemoved=FALSE; 7KL v6]b  
 for(int index=0;index<MAX_KEY;index++){ P5nO78  
  if(hCallWnd[index]==hWnd){ ]? g@jRs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?_vakJ )  
    hCallWnd[index]=NULL; 2Yn <2U/^R  
    HotKey[index]=0; $?<Z!*x  
    HotKeyMask[index]=0; .=;3d~.]  
    bRemoved=TRUE; tlqiXh<  
    KeyCount--; DSk/q-'u  
    break; N<|Nwq:NN  
   } lWc:$qnR-K  
  } )V6Hl@v  
 } Id|L`  w  
 return bRemoved; C=It* j55  
} 7/f3Z 1g  
S.m{eur!,E  
,J>5:ht(6  
  DLL中的钩子函数如下: WDPb!-VT  
.my0|4CQ#@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) | >htvDL  
{ LBsluT  
 BOOL bProcessed=FALSE; >>o dZL  
 if(HC_ACTION==nCode) OJ$]V,Z00x  
 { J/GSceHF  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $[&*Bj11Yg  
   switch(wParam) G <f@#[$'  
   {  a]/>ra5{  
    case VK_MENU: vbBc}G"w  
     MaskBits&=~ALTBIT; FCuB\ Q  
     break; \r,Q1n?7  
    case VK_CONTROL: 2.zsCu4lj.  
     MaskBits&=~CTRLBIT; +W\f(/q0  
     break; /8g^T")  
    case VK_SHIFT:  Q&g^c2  
     MaskBits&=~SHIFTBIT; d%,eZXg'  
     break; pDcjwlA%  
    default: //judge the key and send message 7cO n9fIE  
     break; U($dx.`v#  
   } H_ox_ u}  
   for(int index=0;index<MAX_KEY;index++){ Nkl_Ho,  
    if(hCallWnd[index]==NULL) @$c\d vO  
     continue; ^!z [t\$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <$~mE9a6  
    { i Ae<&Ms  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \\7ZWp\fN  
     bProcessed=TRUE; YmgLzGk`  
    } xJZ>uTN  
   } <'Wo@N7  
  } J<maQ6p  
  else if((lParam&0xc000ffff)==1){ //有键按下 >U*T0FL7  
   switch(wParam) (egzH?  
   { D'A/wG  
    case VK_MENU:  !@'6)/  
     MaskBits|=ALTBIT; Mo @C9Y0  
     break; K7W6ZH9;  
    case VK_CONTROL: /)(#{i*  
     MaskBits|=CTRLBIT; ;Tc`}2  
     break; ;R?I4}O#R8  
    case VK_SHIFT: cwWodPNm  
     MaskBits|=SHIFTBIT; 2e9es  
     break; fKeT~z{~  
    default: //judge the key and send message q**G(}K  
     break; D] ~MC  
   } ANSFdc  
   for(int index=0;index<MAX_KEY;index++){  KiOcu=F  
    if(hCallWnd[index]==NULL) :WL'cJ9a  
     continue; meks RcF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mPP`xL?T  
    { p>;_e(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `zXO_@C  
     bProcessed=TRUE; u[/m|z  
    } q]N:Tpm9  
   } D{4YxR PX  
  } )!:Lzi  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 lBFMwJU)  
   for(int index=0;index<MAX_KEY;index++){ q^L<X)  
    if(hCallWnd[index]==NULL) p4i]7o@  
     continue; 16i "Yg!*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J8)#PY[i4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); P7MeX(Tay  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 z0*_^MH  
   } }HYjA4o\A  
  } jR#~I@q^  
 } _({A\}Q|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); mJ`A_0  
} G 0;XaL:  
_}VloiY  
  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: )V:]g\t  
 n>`as  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /'DsB%7g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YH_7=0EJ  
{aC!~qR  
  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: Eb>78k(3I)  
B0!"A  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) jDN ]3Y`  
{ `o?Ph&p}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 1=a>f "cyf  
 { +_xOLiu  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 1`9xIm*9w  
  SaveBmp(); !i%"7tQ3$  
  return FALSE; UaViI/ks  
 } { TRsd  
 …… //其它处理及默认处理 z)=+ F]  
} XNb ZNaAd  
F. =Bnw/-  
GS Q/NYK  
  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。 u% n*gcY  
b-*3 2Y%  
  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。 ^ Dt#$Z  
lmSo8/%T  
  二、编程步骤 =)` p_W  
9{8GP  
  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"; $gM8{.!  
<K4 ,7J$}h  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ZzBQe  
STw#lU) %(  
  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; zf>5,k'x'A  
FwZ>{~?3  
  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; ~/ilx#d  
^F"iP7   
  5、 添加代码,编译运行程序。 @*DyZB  
-+em!g'  
三、程序代码 'EfR|7m  
4r0b)Y &I  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Yl$SW;@  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) g@Qgxsyk>  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ LW:LFzp  
#if _MSC_VER > 1000 D^;*U[F?  
#pragma once .*JA!B  
#endif // _MSC_VER > 1000 F5qFYL;  
#ifndef __AFXWIN_H__ AkT<2H|4  
#error include 'stdafx.h' before including this file for PCH _:B1_rz7,  
#endif rzI|?QaPi  
#include "resource.h" // main symbols 5rV( (  
class CHookApp : public CWinApp l?)ZJ3]a  
{ 3QOUU,Dt$  
 public: a9?y`{%L  
  CHookApp(); ?kz+R'  
  // Overrides ^p/Ob'!  
  // ClassWizard generated virtual function overrides N9<Ujom  
  //{{AFX_VIRTUAL(CHookApp) h}Wdh1.M3  
 public: 1uk 0d`JL  
  virtual BOOL InitInstance(); 3o|I[!2.  
  virtual int ExitInstance(); ,mL !(US  
  //}}AFX_VIRTUAL ~b|`'kU  
  //{{AFX_MSG(CHookApp) 1I}b|6 `  
  // NOTE - the ClassWizard will add and remove member functions here. `O8b1-1q~  
  // DO NOT EDIT what you see in these blocks of generated code ! :aIN9;  
  //}}AFX_MSG %D`,k*X  
  DECLARE_MESSAGE_MAP() *VkgQ`c  
}; '2-oh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); OcSEo7W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q!FLR>8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #s%-INcR  
BOOL InitHotkey(); ?<yM7O,4  
BOOL UnInit(); @&hnL9D8lL  
#endif ;|cTHGxbE  
rBN)a"  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. G^1b>K  
#include "stdafx.h" " uPy,<l  
#include "hook.h" `:G%   
#include <windowsx.h> z>[tF5  
#ifdef _DEBUG 5')8r ';,  
#define new DEBUG_NEW 9ElCg"  
#undef THIS_FILE uGl| pJ\y=  
static char THIS_FILE[] = __FILE__; @E53JKYhY  
#endif nB ".'=  
#define MAX_KEY 100 Jj^GWZRu  
#define CTRLBIT 0x04 w_iamqe,  
#define ALTBIT 0x02 CC3v%^81l^  
#define SHIFTBIT 0x01 l#wdpD a{  
#pragma data_seg("shareddata") h !(>7/Gi  
HHOOK hHook =NULL; zK+52jhi  
UINT nHookCount =0; OW(&s,|6x  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Ih[+K#t+E  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Zzl,gy70  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey -)y%~Zn  
static int KeyCount =0; ib0g3p-Lc  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #9LzY  
#pragma data_seg() ksjUr1o  
HINSTANCE hins; jAsO8  
void VerifyWindow(); t%r :4,  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?oiKVL"7  
//{{AFX_MSG_MAP(CHookApp) '~wpP=<yyF  
// NOTE - the ClassWizard will add and remove mapping macros here. jRpdft  
// DO NOT EDIT what you see in these blocks of generated code! 2~;&g?T6  
//}}AFX_MSG_MAP 0%;146.p  
END_MESSAGE_MAP() ^aRgMuU  
~ekh1^evu  
CHookApp::CHookApp() vY*\R0/a  
{ Yp4c'Zk  
 // TODO: add construction code here, *V;3~x!  
 // Place all significant initialization in InitInstance gK3Mms]}m  
} - n6jG}01b  
RX2{g^V7  
CHookApp theApp; pD@zmCU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) i$-#dc2qY  
{ sst,dA V$  
 BOOL bProcessed=FALSE; >LF&EM]  
 if(HC_ACTION==nCode) ! qJI'+_  
 { e^$j5jV  
  if((lParam&0xc0000000)==0xc0000000){// Key up H%z@h~s>  
   switch(wParam) .#5l$['  
   { &}`K^5K|O:  
    case VK_MENU: aP>37s  
     MaskBits&=~ALTBIT; 1{2eY%+C  
     break; !|m9|  
    case VK_CONTROL: ! ]Mc4!E  
     MaskBits&=~CTRLBIT; \`,xgC9K  
     break; Ca$c;  
    case VK_SHIFT: RwTzz] M  
     MaskBits&=~SHIFTBIT; X^@[G8v%  
     break; BZ F,=v  
    default: //judge the key and send message }1%r%TikY  
     break; |[cdri^?D  
   } I&1!v8  
   for(int index=0;index<MAX_KEY;index++){ C/v}^#cLD  
    if(hCallWnd[index]==NULL) |&hU=J o  
     continue; 0D)`2W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z]-WFU_ N  
    { n!N\zx8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;~sr$6  
     bProcessed=TRUE; mPVE?jnR^0  
    } %TK&)Q% h5  
   } O=jN&<rb  
  } DPJh5d  
  else if((lParam&0xc000ffff)==1){ //Key down MPRO !45Z  
   switch(wParam) 3^G96]E  
   { mT_GrIl[  
    case VK_MENU: CJq c\I~  
     MaskBits|=ALTBIT; E:VGji7s  
     break; <uF [,  
    case VK_CONTROL: _qTpy)+  
     MaskBits|=CTRLBIT; pX<a2F P  
     break; S>ugRasZ$  
    case VK_SHIFT: Xi~9&ed#$i  
     MaskBits|=SHIFTBIT; BQjam+u6  
     break; &P n]  
    default: //judge the key and send message Z|`fHO3j  
     break; =%h~/,  
   } nN ~GP"}  
   for(int index=0;index<MAX_KEY;index++) #Mi|IwL  
   { ^&:'NR  
    if(hCallWnd[index]==NULL) O2H/rFx4  
     continue; c)1=U_61  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wR7aQg  
    { +(ny|r[#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); p~bkf>  
     bProcessed=TRUE; 3B,QJ&  
    } o?!uX|Fy  
   } 9p> /?H|  
  } KZK,w#9.  
  if(!bProcessed){ s[-]cHQ  
   for(int index=0;index<MAX_KEY;index++){  0:dB 9  
    if(hCallWnd[index]==NULL) xYR#%!M  
     continue; vbn>mg5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  a8h]n:!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); jpO38H0)  
   } XZ:1!;  
  } 9oq)X[  
 } 5V|tXsy:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *j<@yG2\gP  
} t&"5dM\  
RWahsJTu  
BOOL InitHotkey() B/Ba5z"r$  
{ #S i|!  
 if(hHook!=NULL){ 3Hm7 uBZ  
  nHookCount++; caD5Pod4  
  return TRUE; ,35Ag#va  
 } deM~[1e[  
 else ~N[|bPRmhE  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 3zb)"\(R  
  if(hHook!=NULL) #'NY}6cb$  
   nHookCount++; KF$%q((  
  return (hHook!=NULL); R]=SWE}U  
} MhH);fn  
BOOL UnInit() Z1]"[U[;  
{ q)Je.6$#X  
 if(nHookCount>1){ WOH9%xv  
  nHookCount--; {U P_i2`.  
  return TRUE; oYq E*mA  
 } \G=bj;&eF  
 BOOL unhooked = UnhookWindowsHookEx(hHook); \DyKtrnm%  
 if(unhooked==TRUE){ gDhl-  
  nHookCount=0; /'+4vXc@  
  hHook=NULL; 0=,'{Vz}A  
 } &enlAV'#)O  
 return unhooked; s=\7)n=,M  
} em/Xu  
2B'^`>+8S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4JK@<GBK6  
{ 2))t*9;h  
 BOOL bAdded=FALSE; KW:r;BFx  
 for(int index=0;index<MAX_KEY;index++){ y<uE-4  
  if(hCallWnd[index]==0){ Fc{((x s  
   hCallWnd[index]=hWnd; au A.6DQ  
   HotKey[index]=cKey; s7Qyfe&>  
   HotKeyMask[index]=cMask; 83xd@-czgh  
   bAdded=TRUE; TA9dkYlE/  
   KeyCount++; YUS?]~XC7x  
   break; T]X{ @_  
  } f<=^ 4a  
 } s KCGuw(mh  
 return bAdded; $Q,n+ /  
} Hc /w ta  
;.r2$/E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q^q=!/qQ  
{ j%Gbg J  
 BOOL bRemoved=FALSE; {"\q(R0  
 for(int index=0;index<MAX_KEY;index++){ N  I3(  
  if(hCallWnd[index]==hWnd){ 7rPLnB]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PoY>5  
    hCallWnd[index]=NULL; @d P~X  
    HotKey[index]=0; }9 FD/  
    HotKeyMask[index]=0; o5V`'[c  
    bRemoved=TRUE; g` kZ T} h  
    KeyCount--; = jBL'|k5  
    break; ~W/}:;  
   } Bx%=EN5.  
  } eAU"fu6d  
 } ev*c4^z:s  
 return bRemoved; ,FS?"Ni  
} T*p|'Q`  
],$6&Cm  
void VerifyWindow() =yo=q)W  
{ 4&H+hN{3  
 for(int i=0;i<MAX_KEY;i++){  TVj1C  
  if(hCallWnd!=NULL){ dgm+U%E  
   if(!IsWindow(hCallWnd)){ &F86SrsI  
    hCallWnd=NULL; 4KZSL: A  
    HotKey=0; \4C)~T:*  
    HotKeyMask=0; `GP3 D~  
    KeyCount--; 7ia "u+Y  
   } ]P JH'=  
  } I_K[!4~Kn  
 } fyGCfM  
} t0+t9w/fTP  
}1@n(#|c  
BOOL CHookApp::InitInstance() [6tR&D #K  
{ .k p $oAL  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^]KIgGv\  
 hins=AfxGetInstanceHandle(); V_{vZ/0e  
 InitHotkey(); 0U9+  
 return CWinApp::InitInstance(); s%FP6u7[i  
} E]1\iV  
$To 4dJb  
int CHookApp::ExitInstance() =tLU]  
{ %{=4Fa(Jux  
 VerifyWindow(); b,z R5R^D;  
 UnInit(); ;;D% l^m+  
 return CWinApp::ExitInstance(); |c]> Q  
} 2c!h2$w  
f*UBigk  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file S_`W@cp[  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 'o7R/`4KR  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `9]P/J^  
#if _MSC_VER > 1000 'et(:}i  
#pragma once q`h7H][(A  
#endif // _MSC_VER > 1000 ry z /rf  
]cS&8{ ^2  
class CCaptureDlg : public CDialog IQ o]9Lx  
{ s_x=^S3~LO  
 // Construction iM4mkCdOO  
 public: 7^`RP e^a+  
  BOOL bTray; YAX #O\,  
  BOOL bRegistered; Y#GT*V  
  BOOL RegisterHotkey(); [>Ikitow  
  UCHAR cKey; axHxqhO7zp  
  UCHAR cMask; "[FCQ  
  void DeleteIcon(); 5ENov!$H  
  void AddIcon(); 4+BrTGp  
  UINT nCount; B'NS&7+].  
  void SaveBmp(); 9)1P+c--  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor i%#th'C!P  
  // Dialog Data 5R$=^gE  
  //{{AFX_DATA(CCaptureDlg) :Fw *r|  
  enum { IDD = IDD_CAPTURE_DIALOG }; ,P;8 }yQ  
  CComboBox m_Key; p{+tFQy  
  BOOL m_bControl; i.B$?cr~  
  BOOL m_bAlt; fp`U?S6  
  BOOL m_bShift; n5/ZJur  
  CString m_Path;  gvvFU,2  
  CString m_Number; 7 3H@kf  
  //}}AFX_DATA dO Y lI`4  
  // ClassWizard generated virtual function overrides E!r4AjaC  
  //{{AFX_VIRTUAL(CCaptureDlg) ddGkk@CA  
 public: O8!!UA8V  
  virtual BOOL PreTranslateMessage(MSG* pMsg); l#mqV@?A~  
 protected: JDIz28Ww  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support VGq{y{(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); zS&7[:IRs'  
  //}}AFX_VIRTUAL =>E44v  
  // Implementation 2 rbX8Y  
 protected: [YL sEo=  
  HICON m_hIcon; WBIQ%XB'  
  // Generated message map functions (, ;MC/l  
  //{{AFX_MSG(CCaptureDlg) ][s*~VK;  
  virtual BOOL OnInitDialog(); >b[4  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !pE>O-| K  
  afx_msg void OnPaint(); q8&4=eV\A  
  afx_msg HCURSOR OnQueryDragIcon(); H620vlC}V  
  virtual void OnCancel(); D/+@d:-G  
  afx_msg void OnAbout(); T\<M?`Y  
  afx_msg void OnBrowse(); NB~*sP-l&  
  afx_msg void OnChange(); p{('KE)  
 //}}AFX_MSG Br_3qJNVP  
 DECLARE_MESSAGE_MAP() 2b{@]Fp  
}; ylo]`Nq  
#endif roK4RYJ7)  
AX!Md:s  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file <v1_F;{n  
#include "stdafx.h" o(S^1j5  
#include "Capture.h" B8P@D"u  
#include "CaptureDlg.h" ?j},O=JFn  
#include <windowsx.h> {EiG23!qV  
#pragma comment(lib,"hook.lib") }W Bm%f  
#ifdef _DEBUG T%z!+/=&^  
#define new DEBUG_NEW L%=BCmMx  
#undef THIS_FILE ?dATMmT-  
static char THIS_FILE[] = __FILE__; NK*:w *SOI  
#endif VLl&>Pbe-  
#define IDM_SHELL WM_USER+1 [U+<uZzOC  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2/a04qA#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7~Xu71^3s  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; C5W-B8>  
class CAboutDlg : public CDialog OV0cr  
{ dNS9<8JX  
 public: R[2[[M  
  CAboutDlg(); 'Gm!Jblo@  
  // Dialog Data K~9 jin  
  //{{AFX_DATA(CAboutDlg) am)J'i,  
  enum { IDD = IDD_ABOUTBOX }; j$JV(fz  
  //}}AFX_DATA G5X|JTzpu<  
  // ClassWizard generated virtual function overrides g/J^K*3]  
  //{{AFX_VIRTUAL(CAboutDlg) <3J=;.\6  
 protected: d- _93  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kG~ivB}x  
  //}}AFX_VIRTUAL "X!_37kQ  
  // Implementation -&HoR!af  
 protected: "1pZzad  
  //{{AFX_MSG(CAboutDlg) b W`)CWd  
  //}}AFX_MSG `s|\" @2  
  DECLARE_MESSAGE_MAP() k -t,y|N  
}; f(zuRM^5  
>ZOZv  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ;9- 4J  
{ 's%ct}y\J  
 //{{AFX_DATA_INIT(CAboutDlg) ir1RAmt%  
 //}}AFX_DATA_INIT Jq=>H@il  
} Qcy+ {j]  
;_;H(%uY  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) NEjB jLJZ  
{ QRn:=J%W W  
 CDialog::DoDataExchange(pDX); 0[3tW[j  
 //{{AFX_DATA_MAP(CAboutDlg) Hr_x~n=w  
 //}}AFX_DATA_MAP ~>wq;T:=  
} +O%a:d%  
Qr xO erp  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) yp7,^l  
 //{{AFX_MSG_MAP(CAboutDlg) Phjf$\pt  
 // No message handlers [eTck73  
 //}}AFX_MSG_MAP kdZ-<O7@  
END_MESSAGE_MAP() Y7IlqC`i  
2oNPR+ -  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  &~f*q?xR  
: CDialog(CCaptureDlg::IDD, pParent) *? orK o  
{ kK_>*iCMo  
 //{{AFX_DATA_INIT(CCaptureDlg) 374_G?t&  
  m_bControl = FALSE; ;Ef)7GE@\[  
  m_bAlt = FALSE; /ux#U]x  
  m_bShift = FALSE; A&@jA5Jb  
  m_Path = _T("c:\\"); ;L/T}!Dx  
  m_Number = _T("0 picture captured."); m'vOFP)'  
  nCount=0; >G -?e!  
  bRegistered=FALSE;  MYW 4@#  
  bTray=FALSE; OYCFx2{  
 //}}AFX_DATA_INIT 9dhFQWz"  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 YfYL?G  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); u8)r W  
} <\#  
^SelqX  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6!Ap;O^*  
{ d+wNGN  
 CDialog::DoDataExchange(pDX); R;I-IZS:  
 //{{AFX_DATA_MAP(CCaptureDlg) P+ h<{%:*  
  DDX_Control(pDX, IDC_KEY, m_Key); l2_E6U"  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5&7?0h+I  
  DDX_Check(pDX, IDC_ALT, m_bAlt); RM=+ZmA  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ~O3uje_  
  DDX_Text(pDX, IDC_PATH, m_Path); A_$Mt~qKi^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); W,eKQV<j  
 //}}AFX_DATA_MAP "{1}  
} */@bNT9BgO  
XVK[p=cIL  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) T;vPR,]rz  
//{{AFX_MSG_MAP(CCaptureDlg) &JzF   
 ON_WM_SYSCOMMAND() &-. eu  
 ON_WM_PAINT() lKD<  
 ON_WM_QUERYDRAGICON() b|C,b"$N0  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) TuhL :  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) x#xO {  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ?p\II7   
//}}AFX_MSG_MAP 7m)ykq:?  
END_MESSAGE_MAP() _|V+["IS  
V,%5 hl'&  
BOOL CCaptureDlg::OnInitDialog() %)@(T ye -  
{ 4%.2 =  
 CDialog::OnInitDialog(); Z.#glmw^=R  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); G"R>aw  
 ASSERT(IDM_ABOUTBOX < 0xF000); `x^,k% :4  
 CMenu* pSysMenu = GetSystemMenu(FALSE); +c2=*IA/  
 if (pSysMenu != NULL) ^)K[1]"uM  
 { ~k_zMU-1  
  CString strAboutMenu; MnsWB[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); v-]-wNqT  
  if (!strAboutMenu.IsEmpty()) rsj}hS$  
  { ]m,p3  
   pSysMenu->AppendMenu(MF_SEPARATOR); > ]N0w  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); i!-sbwd7  
  } ,Onm!LI=  
 } lfG&V +S1  
 SetIcon(m_hIcon, TRUE); // Set big icon wtick~)  
 SetIcon(m_hIcon, FALSE); // Set small icon [~%;E[ky$  
 m_Key.SetCurSel(0); V$%Fs{  
 RegisterHotkey(); D,R2wNF  
 CMenu* pMenu=GetSystemMenu(FALSE); Hu!>RSg,,2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7)X&fV6<8  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); &wC.?w$  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Bc ,z]  
 return TRUE; // return TRUE unless you set the focus to a control N= q29JU  
} a5+v)F/=  
[t\Mu}b  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) l.'E\3Bo  
{ #NxvLW/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) hA19:H=7R0  
 { hLA=7  
  CAboutDlg dlgAbout; v=^)`C6Ma  
  dlgAbout.DoModal(); yxq!. 72  
 } h |  
 else R$3+ 01j|  
 { d-2I_ )9  
  CDialog::OnSysCommand(nID, lParam); qMj e,Y  
 } e?fjX-  
} KFrmH  
AxQ/  
void CCaptureDlg::OnPaint() yodrX&"  
{ OnJSu z>-  
 if (IsIconic()) P+l^Ep8P  
 { +:8YMM#9V  
  CPaintDC dc(this); // device context for painting Ceb i9R[  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); n8ya$bc  
  // Center icon in client rectangle Q&\ksM  
  int cxIcon = GetSystemMetrics(SM_CXICON); /JY i^rZ  
  int cyIcon = GetSystemMetrics(SM_CYICON); x1ex}_\  
  CRect rect; ,;& PKY  
  GetClientRect(&rect); 90I3_[Ii  
  int x = (rect.Width() - cxIcon + 1) / 2; yU lQPrNX  
  int y = (rect.Height() - cyIcon + 1) / 2; r>eXw5Pr7  
  // Draw the icon XfDQx!gJ  
  dc.DrawIcon(x, y, m_hIcon); <]`2H}*U'  
 } <GR:5pJ%  
 else r+yLK(<zp  
 { .Cd$=v6  
  CDialog::OnPaint(); HC}C_Q5c91  
 } b%$C!Tq'  
} |"*:ZSj  
No+zw%l0E  
HCURSOR CCaptureDlg::OnQueryDragIcon() $h f\ #'J  
{ Nd)o1 {I  
 return (HCURSOR) m_hIcon; ?*dx=UI  
} ps J 1J  
j> M%?Tw  
void CCaptureDlg::OnCancel() FkkB#Jk4  
{ 0`=?ig_  
 if(bTray) $~\qoW<  
  DeleteIcon(); D(GHkS*0q  
  CDialog::OnCancel(); >FhBl\oIi  
}  X;g|-<  
v2g+o KO]  
void CCaptureDlg::OnAbout() Q:=/d$*xd  
{ k9?+9bExXA  
 CAboutDlg dlg; 40ZB;j$l  
 dlg.DoModal(); 4 ETVyK|  
} hQeZI+  
?uv%E*TU  
void CCaptureDlg::OnBrowse() 2F]MzeW  
{ s o s&  
 CString str; 34+}u,=  
 BROWSEINFO bi; Fb-TCq1y#  
 char name[MAX_PATH]; >iV(8EgBS  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); IA!Kp g W  
 bi.hwndOwner=GetSafeHwnd(); EeJ] > 1  
 bi.pszDisplayName=name; lvffQ_t  
 bi.lpszTitle="Select folder"; =Q/i< u  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; exvsf|  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); zt6ep=  
 if(idl==NULL) aPgG+tu  
  return; $Q4b~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); RT9@&5>il  
 str.ReleaseBuffer(); ^)I:82"|?  
 m_Path=str; d_hcv|%  
 if(str.GetAt(str.GetLength()-1)!='\\') [?2mt`g  
  m_Path+="\\"; c9 c Nlp  
 UpdateData(FALSE); Pl>t\`1:|A  
} BO|Jrr>  
=)LpMTz  
void CCaptureDlg::SaveBmp() {5`?0+  
{ =7> ~u  
 CDC dc; l{g( z !  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >kT~X ,o  
 CBitmap bm; c i>=45@J  
 int Width=GetSystemMetrics(SM_CXSCREEN); <hdCO< 0(  
 int Height=GetSystemMetrics(SM_CYSCREEN); *WG}K?"/  
 bm.CreateCompatibleBitmap(&dc,Width,Height); <NO~TBHF  
 CDC tdc; /;1FZ<zU  
 tdc.CreateCompatibleDC(&dc); /0(KKZ)  
 CBitmap*pOld=tdc.SelectObject(&bm); RB!E>]   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); nm.d.A/]Z  
 tdc.SelectObject(pOld); %{"STbO#>  
 BITMAP btm; hW&UG#PY>  
 bm.GetBitmap(&btm); hd' n"  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; N0f}q1S<-A  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); m~A/.t%=  
 BITMAPINFOHEADER bih; t=#)3C`Q}  
 bih.biBitCount=btm.bmBitsPixel; I 3PnyNZ  
 bih.biClrImportant=0; PHkvt!uH  
 bih.biClrUsed=0; "AVc^>  
 bih.biCompression=0; !T)>q%@ai  
 bih.biHeight=btm.bmHeight; 3[4]G@  
 bih.biPlanes=1; P8f-&(  
 bih.biSize=sizeof(BITMAPINFOHEADER); mLSAi2Y  
 bih.biSizeImage=size; +l\Dp  
 bih.biWidth=btm.bmWidth; T rW3@@}j  
 bih.biXPelsPerMeter=0; R >TtAm0N  
 bih.biYPelsPerMeter=0; @UX`9]-P  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); QNY{ p k  
 static int filecount=0; )g9qkQ8q  
 CString name; Yaqim<j  
 name.Format("pict%04d.bmp",filecount++); &XP 0  
 name=m_Path+name; "-sz7}Mb  
 BITMAPFILEHEADER bfh; 3 a`-_<  
 bfh.bfReserved1=bfh.bfReserved2=0; TEtZ PGFl  
 bfh.bfType=((WORD)('M'<< 8)|'B'); B=7L+6  
 bfh.bfSize=54+size; WD:5C3;  
 bfh.bfOffBits=54; 9)qx0  
 CFile bf; V'B 6C#jT  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ FgxQ}VvlH  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0Qz \"gr  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p*Cbe\  
  bf.WriteHuge(lpData,size); U<x3=P  
  bf.Close(); RD^o&VXO  
  nCount++; 2#!D"F  
 } 3h&s=e!  
 GlobalFreePtr(lpData); Z)<>d.  
 if(nCount==1)  <_~`)t  
  m_Number.Format("%d picture captured.",nCount); smggr{-  
 else tP9}:gu  
  m_Number.Format("%d pictures captured.",nCount); qM)^]2_-  
  UpdateData(FALSE); /+iaw~={"  
} 5ym =2U  
UT-=5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?QgWW  
{ s$;v )w$  
 if(pMsg -> message == WM_KEYDOWN) UZ$p wjC  
 { ;%}  
  if(pMsg -> wParam == VK_ESCAPE) BshS@"8r  
   return TRUE; XcXd7e  
  if(pMsg -> wParam == VK_RETURN) 8Vx'sJ>r4  
   return TRUE; .dV!du  
 } *7ox_ R@  
 return CDialog::PreTranslateMessage(pMsg); z|Xl%8  
} oKUJB.PF  
P7 n~Ui~U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]Q+Tm2{  
{ <_5z^@N3$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?AEpg.9R-  
  SaveBmp(); R[b?kT-%  
  return FALSE; AbB%osz}Ed  
} >.A{=?   
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2&M 8Wb#  
 CMenu pop; UX6-{ RP  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 28-@Ga4  
 CMenu*pMenu=pop.GetSubMenu(0); *k/_p ^  
 pMenu->SetDefaultItem(ID_EXITICON); jm!G@k6TA  
 CPoint pt; W;1Hyk  
 GetCursorPos(&pt); CzgLgh;:T  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0R.@\?bhL  
 if(id==ID_EXITICON) +ad 2  
  DeleteIcon(); 2 IGAZ%%  
 else if(id==ID_EXIT) MkQSq MU=  
  OnCancel(); Kxg09\5i  
 return FALSE; rei<{woX  
} ,,?t>|3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); a}yJ$6xi  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {x+jFj.  
 AddIcon(); _+GCd8d  
 return res; d(tq;2-  
} E7N1B*KI  
G2mv6xK'  
void CCaptureDlg::AddIcon() \ZA%"F){  
{ pJqayzV  
 NOTIFYICONDATA data; )|:|.`H  
 data.cbSize=sizeof(NOTIFYICONDATA); 1\1o65en  
 CString tip; mesR)fTI  
 tip.LoadString(IDS_ICONTIP); ,E_hG3}}  
 data.hIcon=GetIcon(0); ]5^u^  
 data.hWnd=GetSafeHwnd(); "ey~w=B$M  
 strcpy(data.szTip,tip); 7%X$6N-X  
 data.uCallbackMessage=IDM_SHELL; ?wmr~j  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ]p~XTZgW  
 data.uID=98; _vad>-=D*U  
 Shell_NotifyIcon(NIM_ADD,&data); A2xORG&FD  
 ShowWindow(SW_HIDE); 18Ty )7r'  
 bTray=TRUE; $ _ gMJ\{  
} wJ{M&n1H  
>4;A (s`  
void CCaptureDlg::DeleteIcon() ydpsPU?wj5  
{ SgJQH7N  
 NOTIFYICONDATA data; [;c#LJ/y  
 data.cbSize=sizeof(NOTIFYICONDATA); [Ga 9^e$Zv  
 data.hWnd=GetSafeHwnd(); _9<Ko.GVq  
 data.uID=98; 3]wV`mD  
 Shell_NotifyIcon(NIM_DELETE,&data); c1c0b|B!U  
 ShowWindow(SW_SHOW); x.'O_7c0:  
 SetForegroundWindow(); oYu5]ry  
 ShowWindow(SW_SHOWNORMAL); JMoWA0f  
 bTray=FALSE; /0zk&g  
} ^K3{6}]  
Q?vGg{>  
void CCaptureDlg::OnChange() ifuVVFov  
{ 8Y:bvs.j  
 RegisterHotkey(); C6GYhG]  
} SwQb"  
TK'(\[E  
BOOL CCaptureDlg::RegisterHotkey() t&ngOF  
{ E_FseR6  
 UpdateData(); TN&1C8xr  
 UCHAR mask=0; *NDzU%X8  
 UCHAR key=0; ^58'*13ZL  
 if(m_bControl) ) ><{A  
  mask|=4; .t\5H<z  
 if(m_bAlt) 4%B${zP(.}  
  mask|=2; #[IQmU23  
 if(m_bShift) zc(- dMlK  
  mask|=1; t0/fF'GZD  
  key=Key_Table[m_Key.GetCurSel()]; sURHj&:t|  
 if(bRegistered){ TzVNZDQ`Jl  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^G15]Pyw  
  bRegistered=FALSE; * ,,D%L  
 } 2&dtOyxo>  
 cMask=mask; )PZ'{S  
 cKey=key; e KET8v[  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 0?k/vV4  
 return bRegistered; JrO2"S  
} O GSJR`yT  
\07 s'W U  
  四、小结 k pEES{f  
V+_L9  
  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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