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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: (zm5 4 Vm  
  D m|_;iO,  
  一、实现方法 r-ldqj  
/%fa_+,|-  
  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: 0%9Nf!j  
iyRB}[y  
#pragma data_seg("shareddata") .Y?/J,Ch  
HHOOK hHook =NULL; //钩子句柄 AxXFzMW  
UINT nHookCount =0; //挂接的程序数目 .7!n%Ks  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 D~< 3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 \; b)qB  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey -]uN16\ F  
static int KeyCount =0; ?&H1C4   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 T vEN0RV2  
#pragma data_seg() Zv`j+b  
+&w=*IAKZ  
  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。 q $Hg\ {c  
XuQ7nlbnq  
  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: |+^-b}0  
fCA/   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR xKKR'v:o\  
cKey,UCHAR cMask) T%%+v#+  
{ :OF:(,J  
 BOOL bAdded=FALSE; qrFC4\q}  
 for(int index=0;index<MAX_KEY;index++){ g' xR$6t  
  if(hCallWnd[index]==0){ q=M\#MlL0'  
   hCallWnd[index]=hWnd; /<HEcB  
   HotKey[index]=cKey; Y[A`r0  
   HotKeyMask[index]=cMask; =s2dD3Fr|  
   bAdded=TRUE; A1zqm_X5)P  
   KeyCount++; HlkG^:)  
   break; S<hj6A  
  } rb/m;8v>  
 } 0]F'k8yLN  
 return bAdded; 4)o_gm~6c4  
} :?Xd&u0){  
//删除热键 Al^n&Aa+\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7VF^&6  
{ yMQuM :d  
 BOOL bRemoved=FALSE; H?dmNwkPY  
 for(int index=0;index<MAX_KEY;index++){ /ry# q% ?  
  if(hCallWnd[index]==hWnd){ 6~ *w~U  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Wp0e?bK_  
    hCallWnd[index]=NULL; VtR?/+8X  
    HotKey[index]=0; 5aF03+ko  
    HotKeyMask[index]=0; KPGX/l  
    bRemoved=TRUE; `Z3Qx~f x  
    KeyCount--; 0L34)W  
    break; hrwQh2sm  
   } hSgfp  
  } 6\MJvg\;  
 } }),tk?\  
 return bRemoved; }`oe<|  
} [TZlvX(E  
y\'t{>U/  
UF[2Rb8?  
  DLL中的钩子函数如下: @quNVx(y  
58H[sM4>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^y?7B_%:B#  
{ vrtK~5K  
 BOOL bProcessed=FALSE; %$b)l? !  
 if(HC_ACTION==nCode) k,L,  
 { uC3o@qGW<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开  [69[Ct  
   switch(wParam) oKIry 8'^N  
   {  _}X_^taTZS  
    case VK_MENU: 5Rv6+d  
     MaskBits&=~ALTBIT; s!\uR.  
     break; U _~lpu  
    case VK_CONTROL: 73$^y)AvY  
     MaskBits&=~CTRLBIT; Ni$WI{e9  
     break; YfC1.8  
    case VK_SHIFT: P@Wi^svj  
     MaskBits&=~SHIFTBIT; UTEUVcJ\  
     break; w_po5[]R  
    default: //judge the key and send message |kvom 4T  
     break; }]pq&v!  
   } "_qH+ =_R  
   for(int index=0;index<MAX_KEY;index++){ :X>%6Xj?RV  
    if(hCallWnd[index]==NULL) ~q]+\qty4  
     continue; Do7&OBI~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <RmI)g>'_^  
    { G: FP9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D?w?0b Eu  
     bProcessed=TRUE; `.f<RVk-  
    } 5oQy $Y  
   } Y{X79Rd  
  } $_-f}E  
  else if((lParam&0xc000ffff)==1){ //有键按下 G9s: Wp  
   switch(wParam) *rO#UE2  
   { UV%A l)3  
    case VK_MENU: ^CUeq"GYoZ  
     MaskBits|=ALTBIT; ; d1\2H  
     break; D6,rb 9  
    case VK_CONTROL: 7|6uY  
     MaskBits|=CTRLBIT; !>B|z=  
     break; ,?GEL>F  
    case VK_SHIFT: }&d@6m]  
     MaskBits|=SHIFTBIT; xrX^";}j  
     break; 8(UUc>g  
    default: //judge the key and send message ylF%6!V}4V  
     break; w/r wE  
   } U2=l; R{  
   for(int index=0;index<MAX_KEY;index++){ |3f?1:"Z  
    if(hCallWnd[index]==NULL) =6b^j]1  
     continue; &B uO-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [HB>\   
    { <d,Qi.G4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); o5gt`H"  
     bProcessed=TRUE; 'c 0]8Y 4  
    } 1 dT1DcZ  
   } fYF\5/_  
  } z'K&LH  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <syMrXk)R(  
   for(int index=0;index<MAX_KEY;index++){ SwV{t}I  
    if(hCallWnd[index]==NULL) 'qS&7 W(  
     continue; ]}2+yK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) XVjs0/5b  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *.wX9g9\  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 K &m`1f  
   } umrfA  
  } &wsxH4  
 } Q=lQy  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q]3bGO;  
} ^9zL[R  
C-/<5D j  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 1BK-uv:  
^ZX71-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); OosxuAC(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mG2*s ^$  
1.YDIB||  
  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: <zE,T@c  
>K$9 (  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) won;tO]\;@  
{ m @) ~.E  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) b: UTq 7^  
 { [(U:1&x &  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 M=hxOta  
  SaveBmp(); H%`Ja('"p  
  return FALSE; ;^nN!KDjR  
 } /k3v\Jq{  
 …… //其它处理及默认处理 F$P8"q+  
} W'w;cy:H  
1w}%>e-S  
5q<AMg  
  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。 e;9Z/);#s  
G9ku(2cq  
  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。 +CL`]'~;E-  
8SII>iL{  
  二、编程步骤 SW|{)L,  
25%[nkO4  
  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"; [F4] pR(  
fQcJyX  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; CAdqoCz|  
S%zn {1F  
  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; T9.3  
Q[EpE,  
  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; c8!q_H~  
[%'yHb~<  
  5、 添加代码,编译运行程序。 Eb66GXF[  
+jQHf-l  
三、程序代码 c3,YA,skb!  
aI]EwVz-q  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL {\3ZmF  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) F]kn4zr  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ z97RNT|Y7U  
#if _MSC_VER > 1000 `R@1Sc<*|  
#pragma once tB4dkWt.}  
#endif // _MSC_VER > 1000 Vx$ ?)&  
#ifndef __AFXWIN_H__ "J|{'k`  
#error include 'stdafx.h' before including this file for PCH IzPnbnS}  
#endif qyzmjV6J2  
#include "resource.h" // main symbols k I  
class CHookApp : public CWinApp #!="b8F  
{ ]t$wK  
 public: r:fMd3;gq  
  CHookApp(); BEWDTOY[  
  // Overrides gXZl3  
  // ClassWizard generated virtual function overrides hKo& ZWPq  
  //{{AFX_VIRTUAL(CHookApp) pRyePxCDj)  
 public: <4r3ZV;'  
  virtual BOOL InitInstance(); .|Unq`ll  
  virtual int ExitInstance(); 6v(?Lr`D  
  //}}AFX_VIRTUAL OolYQU1_  
  //{{AFX_MSG(CHookApp) L-Io!msb  
  // NOTE - the ClassWizard will add and remove member functions here. C s XV0  
  // DO NOT EDIT what you see in these blocks of generated code ! 4e OS+&  
  //}}AFX_MSG (JV [7u -  
  DECLARE_MESSAGE_MAP() ZBYFQTEE  
}; A=8%2U wI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); WUnz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); e$'|EE.=q+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x_Y03__/  
BOOL InitHotkey(); +/+:D9j ,  
BOOL UnInit(); 4yy9m8/  
#endif d)hA'k  
BMaw]D  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Eod'Esye5  
#include "stdafx.h" *Ae> ,LyE  
#include "hook.h" +9EG6"..@H  
#include <windowsx.h> ')eg6IC0&T  
#ifdef _DEBUG  S9\_ODv  
#define new DEBUG_NEW haNi [|  
#undef THIS_FILE 2>`m1q:  
static char THIS_FILE[] = __FILE__; cg`bbZ  
#endif C8dC_9  
#define MAX_KEY 100 _,r2g8qm  
#define CTRLBIT 0x04 d2'1 6.lV  
#define ALTBIT 0x02 );*:Uz sC_  
#define SHIFTBIT 0x01 :Y4 m3|  
#pragma data_seg("shareddata") 05 56#U&>  
HHOOK hHook =NULL; R*PR21g  
UINT nHookCount =0;  mE1m  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey j >pv@D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT )?d(7d-l  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey =(]yl_  
static int KeyCount =0; s}w?Dvo\  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift AN)exU ?  
#pragma data_seg() Bh<DqN  
HINSTANCE hins; _m0B6?KJ  
void VerifyWindow(); $W_sIS0\z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) OoIs'S-Z#  
//{{AFX_MSG_MAP(CHookApp) 4$W}6 v  
// NOTE - the ClassWizard will add and remove mapping macros here. .|?UqZ(,  
// DO NOT EDIT what you see in these blocks of generated code! W"3YA+qpI  
//}}AFX_MSG_MAP yyZs[5Q  
END_MESSAGE_MAP() QVT|6znw  
1s\   
CHookApp::CHookApp() qnO>F^itF  
{ r2b_$  
 // TODO: add construction code here, $0[t<4K`yn  
 // Place all significant initialization in InitInstance #{f%b,.yxt  
} bX*>Zm   
58]C``u@Y  
CHookApp theApp; bf4QW JZD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) OV>JmYe1{/  
{ ;*+wg5|  
 BOOL bProcessed=FALSE; 5EX Ghc'  
 if(HC_ACTION==nCode) -d+o\qp"#  
 { 8?l/x  
  if((lParam&0xc0000000)==0xc0000000){// Key up yq6Gyoi<  
   switch(wParam) TmEJ!)*  
   { ] Hiw+5n  
    case VK_MENU: ",, W1]"%  
     MaskBits&=~ALTBIT; 6B8g MO  
     break; &m5FYm\  
    case VK_CONTROL: ^}Wk  
     MaskBits&=~CTRLBIT; yiO/0nMp  
     break; ?"@`SEdnU2  
    case VK_SHIFT: ]=Tle&yM+T  
     MaskBits&=~SHIFTBIT; aGz$A15#  
     break; tS[@3h  
    default: //judge the key and send message |#i|BVnoE  
     break; <>71;%e;'  
   } +eUWf{(_  
   for(int index=0;index<MAX_KEY;index++){ W ])Lc3X  
    if(hCallWnd[index]==NULL) JmBe1"hs  
     continue; ^.g BHZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UlD]!5NO  
    {  I?R?rW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); bnzIDsw!Q  
     bProcessed=TRUE; !,Uzt1K:  
    } v\ <4y P  
   } O[<YYL 0  
  } Ne b")  
  else if((lParam&0xc000ffff)==1){ //Key down [sc4ULS &  
   switch(wParam) {kOTQG?y  
   { 8M6wc394  
    case VK_MENU: &P:2`\'  
     MaskBits|=ALTBIT; <FofRFaS  
     break; uXuA4o$t-  
    case VK_CONTROL: N~! G AaD  
     MaskBits|=CTRLBIT; sZh| <2  
     break; lHI?GiB@  
    case VK_SHIFT: Y'U]!c9  
     MaskBits|=SHIFTBIT; #+ai G52+  
     break; /RBIZ_  
    default: //judge the key and send message +@mgb4_  
     break; GOU>j "5}2  
   } 5sZqX.XVF  
   for(int index=0;index<MAX_KEY;index++) X%R)  
   { U$m[{r2M  
    if(hCallWnd[index]==NULL) i5; _  
     continue; )YY8`\F>1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _t-e.2a v  
    { N2.(0 G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); spG3"Eodi  
     bProcessed=TRUE; ?' /#Gt`  
    } M{)|9F  
   } H[[#h=r0f  
  } I7]qTS[vg  
  if(!bProcessed){ 2qDyb]9  
   for(int index=0;index<MAX_KEY;index++){ ^@f-Ni\  
    if(hCallWnd[index]==NULL) :=oIvSnh  
     continue; XY)I~6$Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) IfzW%UL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Sau?Y  
   } [J\! 2\Oo  
  } g!I0UAm  
 } <tI_u ~P  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2q}lSa7r  
} =2OLyZDI  
)u>/:  
BOOL InitHotkey() L g2z `uv  
{ Aq,&p,m03  
 if(hHook!=NULL){ I~T~!^}U  
  nHookCount++; *5z"Xy3J  
  return TRUE; K06x7W  
 } As+^6  
 else 9R3YUW}s  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %T,cR>lw  
  if(hHook!=NULL) *}RV)0mif  
   nHookCount++; COFCa&m9c  
  return (hHook!=NULL); b~Un=-@5a  
} qk_YFR?R  
BOOL UnInit() ['_W <  
{ #4Ltw ,b^  
 if(nHookCount>1){ H$!sK  
  nHookCount--; P.W@5:sD  
  return TRUE; V2o1~R~  
 } 58[.]f~0  
 BOOL unhooked = UnhookWindowsHookEx(hHook); F-GrQd:O=  
 if(unhooked==TRUE){ %'&_Po\  
  nHookCount=0; 1qE*M7_:E>  
  hHook=NULL; \:Z8"~G  
 } ~ yu\vqN  
 return unhooked; V7)<MY  
} Ocf:73t  
V*%Lc9<d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r68d\N`.  
{ cIQ e^C  
 BOOL bAdded=FALSE; 3Bbd2[<W  
 for(int index=0;index<MAX_KEY;index++){ ?XnKKw\  
  if(hCallWnd[index]==0){ #<81`%  
   hCallWnd[index]=hWnd; LPS]TG\  
   HotKey[index]=cKey; f"aqg/l  
   HotKeyMask[index]=cMask; Jl@YBzDfF  
   bAdded=TRUE; HImQ.y!B  
   KeyCount++; fDrjR6xV  
   break; 4|/=]w  
  } qK,PuD7i"  
 } !CUX13/0  
 return bAdded; h"4i/L3aAh  
} W;QU6z>  
@WTzFjv@?4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @ayrI]m#>,  
{ OY,iz  
 BOOL bRemoved=FALSE; x.ucsb  
 for(int index=0;index<MAX_KEY;index++){ UO}Yr8Z;  
  if(hCallWnd[index]==hWnd){ @% .;}tC  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _KAg1Ww  
    hCallWnd[index]=NULL; ftccga  
    HotKey[index]=0; OYj~"-3y)  
    HotKeyMask[index]=0; _.+2sm   
    bRemoved=TRUE; Wq"^{  
    KeyCount--; ,A;wLI  
    break; VL8yL`~zc.  
   } *x@.$=NF"  
  } XpT+xv1`;  
 } R@lA5w  
 return bRemoved; 2T3b6  
} ;bYLQ  
a=AP*adx8  
void VerifyWindow() `c'R42S A  
{ Qt"i  
 for(int i=0;i<MAX_KEY;i++){ *B%ulsm  
  if(hCallWnd!=NULL){ \PM5B"MDZ  
   if(!IsWindow(hCallWnd)){ p&W{g $D>  
    hCallWnd=NULL; f!13Ob<8r  
    HotKey=0; P*3PDa@  
    HotKeyMask=0; f;]C8/W  
    KeyCount--; j)Y68fKK  
   } :0vKt 6>Sp  
  } 8~:s$~&r  
 } 0jMS!"k   
} !f)^z9QX8  
wG",Obja  
BOOL CHookApp::InitInstance() f_;6uCCO  
{ &m{vLw  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); _)-y&  
 hins=AfxGetInstanceHandle(); 3?uah' D5  
 InitHotkey(); O%m>4OdH  
 return CWinApp::InitInstance(); 3\H0Nkubts  
} OHK]=DH:M  
.aD=d\  
int CHookApp::ExitInstance() 6&[rA TU+  
{ 7Lx =VX#]q  
 VerifyWindow(); lzK,VZ=mM  
 UnInit(); #KwK``XC 4  
 return CWinApp::ExitInstance(); :za:gs0  
} W ,|JocDq  
]udH`{]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file YV)h"u+@0  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (i>bGmiN  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ lj"72   
#if _MSC_VER > 1000 ' qN"!\  
#pragma once {7d\du&G  
#endif // _MSC_VER > 1000 +~'ap'k m  
o`~ %}3  
class CCaptureDlg : public CDialog z0xw0M+X  
{ C0[ Z>$  
 // Construction +d JLT}I8M  
 public: 6 u}c543  
  BOOL bTray; BiD}C  
  BOOL bRegistered; H\<^p",`  
  BOOL RegisterHotkey(); =O'>H](Q  
  UCHAR cKey; TmUN@h  
  UCHAR cMask; n--w-1  
  void DeleteIcon(); `Uy4>?  
  void AddIcon(); M:cW/&ZJ  
  UINT nCount; ,&0iFUwN_  
  void SaveBmp(); Or"+d 5  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Usf7 AS=  
  // Dialog Data <BhNmEo)2  
  //{{AFX_DATA(CCaptureDlg) E2yL9]K2  
  enum { IDD = IDD_CAPTURE_DIALOG }; =6< Am  
  CComboBox m_Key; t[HA86X  
  BOOL m_bControl; %C~LKs5oH  
  BOOL m_bAlt; #uCE0}N@  
  BOOL m_bShift; Rd>PE=u  
  CString m_Path; V^qkHm e  
  CString m_Number; .;jp2^  
  //}}AFX_DATA m$80D,3  
  // ClassWizard generated virtual function overrides 5<mGG;F  
  //{{AFX_VIRTUAL(CCaptureDlg) sX|bp)Nw  
 public: 8mv}-;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *."a>?D~  
 protected: T Y*uK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @Xl/<S&  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); kC=h[<'  
  //}}AFX_VIRTUAL be+tAp`  
  // Implementation D5jZ;z}  
 protected: o 12w p  
  HICON m_hIcon; aT20FEZ;  
  // Generated message map functions WzdE XcY  
  //{{AFX_MSG(CCaptureDlg) =`KV),\  
  virtual BOOL OnInitDialog(); _l$X![@6=  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 48"=,IrM  
  afx_msg void OnPaint(); {B)-+0 6  
  afx_msg HCURSOR OnQueryDragIcon(); UQ.DKUg  
  virtual void OnCancel();  Mt   
  afx_msg void OnAbout(); y3Lq"?h  
  afx_msg void OnBrowse();  ];hK5  
  afx_msg void OnChange(); [zc8f  
 //}}AFX_MSG V jZx{1kCR  
 DECLARE_MESSAGE_MAP() jR@J1IR<  
}; iYBp"+#2  
#endif CT#u+]T  
KXbD7N.  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file t7qzAr  
#include "stdafx.h" 82A[[^`  
#include "Capture.h" RZ GD5`n  
#include "CaptureDlg.h" XpoEZ|0  
#include <windowsx.h> ;.#l[  
#pragma comment(lib,"hook.lib") X@up=%(  
#ifdef _DEBUG U!Eo*?LU$  
#define new DEBUG_NEW 0 \}%~e  
#undef THIS_FILE ODE^;:z !  
static char THIS_FILE[] = __FILE__; #Oq~ZV|<l  
#endif hH*/[|z  
#define IDM_SHELL WM_USER+1 *8#]3M]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3iv;4e ;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {[$JiljD  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 4I7;/ZgALQ  
class CAboutDlg : public CDialog /I@Dv?  
{ }S}9Pm,:  
 public: /Lt Lu  
  CAboutDlg(); 1 -:{&!  
  // Dialog Data ZD t|g^  
  //{{AFX_DATA(CAboutDlg) o}VW%G"  
  enum { IDD = IDD_ABOUTBOX }; Ct\n1T }  
  //}}AFX_DATA O.^1r  
  // ClassWizard generated virtual function overrides NI33lp$V  
  //{{AFX_VIRTUAL(CAboutDlg) XR.Sm<A[  
 protected: 02 6|u|R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J'4V_Kjg-  
  //}}AFX_VIRTUAL e!.r- v9  
  // Implementation NkL>ru!b9  
 protected: J~(M%] &k^  
  //{{AFX_MSG(CAboutDlg) -wUw)gJbM  
  //}}AFX_MSG HqKI|^  
  DECLARE_MESSAGE_MAP() DqbU$jt`  
}; f<}>*xH/k  
!K5D:x  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) i\94e{uty[  
{ &I=F4 z  
 //{{AFX_DATA_INIT(CAboutDlg) LG> lj$hO  
 //}}AFX_DATA_INIT -naoM  
} 'Nn>W5#))  
PAHkF&  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) YDo Vm?  
{ 0DgEOW9H  
 CDialog::DoDataExchange(pDX); N\Li/  
 //{{AFX_DATA_MAP(CAboutDlg) 2/M:KR  
 //}}AFX_DATA_MAP QZ^P2==x  
} 8@Hl0{q  
Q]"u?Q]  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) h Lv_ER?  
 //{{AFX_MSG_MAP(CAboutDlg) Gp5[H}8K  
 // No message handlers iQj2aK Gs  
 //}}AFX_MSG_MAP [|E|(@J  
END_MESSAGE_MAP() =!Ce#p?h,  
ITf, )?|]Y  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \Cz uf   
: CDialog(CCaptureDlg::IDD, pParent) dlB?/J<  
{ (cLcY%$  
 //{{AFX_DATA_INIT(CCaptureDlg) kjOPsz*0  
  m_bControl = FALSE; fjwUh>[ }  
  m_bAlt = FALSE; h:l4:{A64  
  m_bShift = FALSE; TOvpv@?-  
  m_Path = _T("c:\\"); Z%1{B*(e  
  m_Number = _T("0 picture captured."); >p,FAz>  
  nCount=0; W\l"_^d*  
  bRegistered=FALSE; f )K(la^'  
  bTray=FALSE; WEVV2BJ  
 //}}AFX_DATA_INIT /C"?Y'  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %jRqrICd  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); JMIS*njq^  
} O~=|6#c  
"E/UNE6P4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 3D*vNVI  
{ n\G88)Dv`V  
 CDialog::DoDataExchange(pDX); _hbTxyj  
 //{{AFX_DATA_MAP(CCaptureDlg) .X)TRD#MW  
  DDX_Control(pDX, IDC_KEY, m_Key); B9Y*'hmI  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); F3 z:|sTqc  
  DDX_Check(pDX, IDC_ALT, m_bAlt); "- XJZ;5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); NwB;9ZhZ  
  DDX_Text(pDX, IDC_PATH, m_Path); ^ua8Ya  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2\, h "W(  
 //}}AFX_DATA_MAP lhRo+X#G  
} w=MiJr#3^  
Q@HW`@i  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 8M9}os  
//{{AFX_MSG_MAP(CCaptureDlg) wdzZ41y1  
 ON_WM_SYSCOMMAND() Y]-7T-*+t  
 ON_WM_PAINT() +rcDA|  
 ON_WM_QUERYDRAGICON() UxS@]YC  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 5^+QTQ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) (iO8[  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9u2Mra  
//}}AFX_MSG_MAP k5ZkD+0Jo  
END_MESSAGE_MAP() `SH#t3 5,  
oM4Q_An  
BOOL CCaptureDlg::OnInitDialog() >L{s[pLJ  
{ _}RzJKl@  
 CDialog::OnInitDialog(); 8R;A5o,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Mu?hB{o1  
 ASSERT(IDM_ABOUTBOX < 0xF000); t3b64J[A{  
 CMenu* pSysMenu = GetSystemMenu(FALSE); UI}df<Ge  
 if (pSysMenu != NULL) ~|t 7  
 { }W)c-91  
  CString strAboutMenu; ]x<`(  
  strAboutMenu.LoadString(IDS_ABOUTBOX); JZM:R  
  if (!strAboutMenu.IsEmpty()) @ %}4R`S0  
  { 1deNrmp%  
   pSysMenu->AppendMenu(MF_SEPARATOR); ?}D|]i34  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1y)|m63&  
  } >nA6w$  
 } VM[U&g<8n  
 SetIcon(m_hIcon, TRUE); // Set big icon Dd:;8Xo  
 SetIcon(m_hIcon, FALSE); // Set small icon SC 6cFyp2  
 m_Key.SetCurSel(0); FsdxLMwk1  
 RegisterHotkey(); *'&mcEpg  
 CMenu* pMenu=GetSystemMenu(FALSE); Rz_fNlA  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); JDA:)[;  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S_EN,2'e  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Nt^9N #+N  
 return TRUE; // return TRUE unless you set the focus to a control Y Cbt(nmr  
} %/r}_V(UN  
!J@!P?0. C  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) /18VQ  
{ P pF"n[j  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) (g>>   
 { +>,4d  
  CAboutDlg dlgAbout; TtZ '~cGR  
  dlgAbout.DoModal(); bw\a\/Dw  
 } eJv_`#R&Of  
 else Q\ AM] U  
 { Spt]<~  
  CDialog::OnSysCommand(nID, lParam); =5QP'Qt{O  
 } 6JYVC>i  
} w?LDaSz\t  
l0%qj(4`6&  
void CCaptureDlg::OnPaint() N-g=_86C"  
{ [LHx9(,NM  
 if (IsIconic()) LQs>[3rK  
 { hQT  p&  
  CPaintDC dc(this); // device context for painting hb_J. Q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?k7z 5ow  
  // Center icon in client rectangle RO?%0-6O&  
  int cxIcon = GetSystemMetrics(SM_CXICON); zYW+Goz/C  
  int cyIcon = GetSystemMetrics(SM_CYICON); r6#It$NU  
  CRect rect; 6AW{qU6  
  GetClientRect(&rect); =ZaTD-%id  
  int x = (rect.Width() - cxIcon + 1) / 2; ee0)%hc1t  
  int y = (rect.Height() - cyIcon + 1) / 2; vg6 ' ^5S7  
  // Draw the icon jZX2)#a!  
  dc.DrawIcon(x, y, m_hIcon); hCcAAF*I;5  
 } }%;o#!<N(@  
 else V&75n.L  
 { j~)GZV  
  CDialog::OnPaint(); .*bu:FuDE  
 } MI,b`pQ  
} Q{~WWv  
vA r fsgk  
HCURSOR CCaptureDlg::OnQueryDragIcon() =d{B.BP(  
{ 9 Z 5!3  
 return (HCURSOR) m_hIcon; $%3"@$  
} ? !dy  
DnZkZ;E/  
void CCaptureDlg::OnCancel() s$,gM,|cK  
{ !M&Qca2  
 if(bTray) jBO/1h=  
  DeleteIcon(); rv\yS:2  
  CDialog::OnCancel(); %FDv6peH  
} g2&%bNQ-5  
%%dQIlF  
void CCaptureDlg::OnAbout() aU)NbESu  
{ ZB5:FtW4  
 CAboutDlg dlg; *QIlh""6  
 dlg.DoModal(); %rmn+L),;  
} cen[|yCtOH  
XmK2Xi;=b  
void CCaptureDlg::OnBrowse() bAsoIra  
{ 4zRz U  
 CString str; %ZajM  
 BROWSEINFO bi; {-T}"WHg7  
 char name[MAX_PATH]; C`Oc%~UkC  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); '>wr _ f  
 bi.hwndOwner=GetSafeHwnd(); x2m*0D~  
 bi.pszDisplayName=name; }KBz8M5  
 bi.lpszTitle="Select folder"; `}Of'i   
 bi.ulFlags=BIF_RETURNONLYFSDIRS; QQnpy.`:/  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <;R}dlBASW  
 if(idl==NULL) :?*|Dp1  
  return; gyt[ZN_2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 0Q]ZS  
 str.ReleaseBuffer(); kT jx.  
 m_Path=str; @&AUbxoj  
 if(str.GetAt(str.GetLength()-1)!='\\') ~ry B*eZH  
  m_Path+="\\"; j`'9;7h M6  
 UpdateData(FALSE); w6RB|^  
} ) H'SU_YU  
%]2hxTV  
void CCaptureDlg::SaveBmp() t 8}R?%u  
{ r\+0J`  
 CDC dc; 6dCS Gb  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); /3VSO"kcZ  
 CBitmap bm; mO6rj=L^  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1^x "P#u  
 int Height=GetSystemMetrics(SM_CYSCREEN); #s\HiO$BT  
 bm.CreateCompatibleBitmap(&dc,Width,Height); C3XB'CL6  
 CDC tdc; [%);N\o2Y  
 tdc.CreateCompatibleDC(&dc); P0B`H7D  
 CBitmap*pOld=tdc.SelectObject(&bm); Q=,6W:j  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $y0[AB|V  
 tdc.SelectObject(pOld); k"kGQk4  
 BITMAP btm; %|tDb  
 bm.GetBitmap(&btm); e6 R<V]g  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; !>,\KxnM  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /f5*KRM  
 BITMAPINFOHEADER bih; 4Pbuv6`RK  
 bih.biBitCount=btm.bmBitsPixel; LkUYh3  
 bih.biClrImportant=0; "}ms|  
 bih.biClrUsed=0; rF3QmR?l  
 bih.biCompression=0; ]d4`PXI  
 bih.biHeight=btm.bmHeight; m ll-cp  
 bih.biPlanes=1; b.LMJ'1  
 bih.biSize=sizeof(BITMAPINFOHEADER); &zxqVI$4  
 bih.biSizeImage=size; / bxu{|.  
 bih.biWidth=btm.bmWidth; IpJMq^ Z  
 bih.biXPelsPerMeter=0; klwC.=?(j"  
 bih.biYPelsPerMeter=0; PQkFzyk  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1[; 7Ay  
 static int filecount=0; [{i"Au]  
 CString name; 4dEfXrMf  
 name.Format("pict%04d.bmp",filecount++); {CO]wqEj  
 name=m_Path+name; - kGwbV}  
 BITMAPFILEHEADER bfh; k3HPY}-  
 bfh.bfReserved1=bfh.bfReserved2=0; H8'q Y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); B#+0jdF;  
 bfh.bfSize=54+size; o#D;H[' A  
 bfh.bfOffBits=54; K~C6dy  
 CFile bf; EO_:C9=d{  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ -KuC31s_W  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); B"@3Qav3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); %OIJ.  
  bf.WriteHuge(lpData,size); K4G43P5q`  
  bf.Close(); kE8\\}B7  
  nCount++; L<}0}y  
 } ]#7{ x  
 GlobalFreePtr(lpData); rT&rv^>f  
 if(nCount==1) THVF(M4v  
  m_Number.Format("%d picture captured.",nCount); ou{}\^DgQ  
 else \6{w#HsP8  
  m_Number.Format("%d pictures captured.",nCount); :aIS>6  
  UpdateData(FALSE); /S9(rI<'  
} `/"rs@  
tyW5k(>  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3.t j%+  
{ k%|Sl>{Ir  
 if(pMsg -> message == WM_KEYDOWN) >-%}'iz+  
 { @L9C_a  
  if(pMsg -> wParam == VK_ESCAPE) pL& Zcpx  
   return TRUE; xy^t_];X  
  if(pMsg -> wParam == VK_RETURN) LA837P  
   return TRUE; mm l`,t8  
 } DL t"cAW  
 return CDialog::PreTranslateMessage(pMsg); FQ3{~05T  
} |[ )e5Xhd  
/O^aFIxk  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) '[Ue0r<jn  
{ c SV`?[a  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7K5D,"D;1  
  SaveBmp(); 9GV1@'<Y]  
  return FALSE; Qf>$'C(7!a  
} 'o!{YLJ fM  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ _x2i=SFo*$  
 CMenu pop; Mur)'  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); o4zX 41W  
 CMenu*pMenu=pop.GetSubMenu(0); 1Zh4)6x  
 pMenu->SetDefaultItem(ID_EXITICON); ^%qe&Pe2  
 CPoint pt; :pp@x*uNP  
 GetCursorPos(&pt); Fu z'!  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +n)_\@aQ  
 if(id==ID_EXITICON) fK0VFN8<I  
  DeleteIcon(); JZo18^aD"'  
 else if(id==ID_EXIT) [J{M'+a  
  OnCancel(); z AZ+'9LB  
 return FALSE; Hdn%r<+c  
} ev{;}2~V  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); k(]R;`f$W  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) n&n WY+GEo  
 AddIcon(); j6JK4{  
 return res; '#oNOU  
} Rs +),  
>iKbn  
void CCaptureDlg::AddIcon()  jO5,PTV  
{ OxC8xB;`  
 NOTIFYICONDATA data; <\fB+ AZ  
 data.cbSize=sizeof(NOTIFYICONDATA); 7eR%zNDa  
 CString tip; q;)+O#CR  
 tip.LoadString(IDS_ICONTIP); pnpx`u;  
 data.hIcon=GetIcon(0); 4#D<#!]^  
 data.hWnd=GetSafeHwnd(); 7~I*u6zY  
 strcpy(data.szTip,tip); L,+m5wKj[  
 data.uCallbackMessage=IDM_SHELL; }Z,xF`  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0p31C7!  
 data.uID=98; e!B>M{  
 Shell_NotifyIcon(NIM_ADD,&data); >x3$Ld  
 ShowWindow(SW_HIDE); Od,P,t9  
 bTray=TRUE; *B3 4  
} ,u<oAI`  
9'5`0$,|^  
void CCaptureDlg::DeleteIcon() 9*<=K  
{ PsMp &~^  
 NOTIFYICONDATA data; 0D s W1  
 data.cbSize=sizeof(NOTIFYICONDATA); jR_o!n~5  
 data.hWnd=GetSafeHwnd(); #$^vP/"$  
 data.uID=98; Qf .ASC   
 Shell_NotifyIcon(NIM_DELETE,&data); yU{Q`6u T  
 ShowWindow(SW_SHOW); <NYf!bx  
 SetForegroundWindow(); 0DB8[#i%:  
 ShowWindow(SW_SHOWNORMAL); (>R   
 bTray=FALSE; h 3`\L4b  
} wyi%!H  
E5+-N  
void CCaptureDlg::OnChange() j(>~:9I`  
{ _no;B_m~  
 RegisterHotkey(); !!\x]$v  
} 8{f~tPY  
_-R&A@  
BOOL CCaptureDlg::RegisterHotkey() y[64O x  
{ b;5&V_  
 UpdateData(); h6(\ tRd!\  
 UCHAR mask=0; QB"Tlw(  
 UCHAR key=0; n90DS/Yx  
 if(m_bControl) {2v,J]v_[  
  mask|=4; SmUj8?6"  
 if(m_bAlt) !LX)  
  mask|=2; $[xS>iuD  
 if(m_bShift) r1A<XP|1?I  
  mask|=1; 49Q tfk  
  key=Key_Table[m_Key.GetCurSel()]; q(9S4F   
 if(bRegistered){ +td]g9Ie  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); GD -cP5$  
  bRegistered=FALSE; >oGs0mej  
 } =A]*r9  
 cMask=mask; i!i=6m.q7  
 cKey=key; \5pBK  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); TZ+- >CG  
 return bRegistered; ^B!cL~S*I  
} crbph.0  
/=K(5Xd  
  四、小结 bP)( 4+t~  
t8ZzBD!dP  
  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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