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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: h!B{7J  
  za>%hZf\  
  一、实现方法 c{ 'Z.mut  
Dw=L]i :0v  
  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: cg )(L;  
IO7z}![V;  
#pragma data_seg("shareddata") G-CL \G\n  
HHOOK hHook =NULL; //钩子句柄 =K@LEZZ'/<  
UINT nHookCount =0; //挂接的程序数目 (~@.9&cBD  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 F,YP Il  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 d 6Y9D=O  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Cq@7oi]W0  
static int KeyCount =0; II^Rp],>  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ImQ -kz?b  
#pragma data_seg() <mX5VGY9^  
|A4B4/!  
  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。 h5{//0 y  
U["<f`z4\  
  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: 28JVW3&)  
ln<[CgV8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hl[<o<`Q  
cKey,UCHAR cMask) 8y<mHJ[B  
{ C,;?`3bH@  
 BOOL bAdded=FALSE; +R?E @S  
 for(int index=0;index<MAX_KEY;index++){ fq1w <e  
  if(hCallWnd[index]==0){ QM!UMqdj  
   hCallWnd[index]=hWnd; yO-2.2h  
   HotKey[index]=cKey; 0MT?}D&TL  
   HotKeyMask[index]=cMask; <F`9;WX  
   bAdded=TRUE; T7YJC,^m  
   KeyCount++; tL&_@PD)3  
   break; !:d\A  
  } *3^7'^j<  
 } ym p*:lH(  
 return bAdded; 4 JBfA,  
} ~m R^j  
//删除热键 va~:Ivl-)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [p\xk{7Y  
{ r<]^.]3zj  
 BOOL bRemoved=FALSE; depCqz@  
 for(int index=0;index<MAX_KEY;index++){ C&q}&=3r  
  if(hCallWnd[index]==hWnd){ ?n<sN"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Ev#, }l+  
    hCallWnd[index]=NULL; Yy!G?>hC  
    HotKey[index]=0; ~+\A4BW  
    HotKeyMask[index]=0; 5 Bcmz'?!  
    bRemoved=TRUE; =M{&g  
    KeyCount--; ^=I[uX-3ue  
    break; c5CxR#O  
   } v&sp;%I6=  
  } 823y;  
 } AzGbvBI&V  
 return bRemoved; @8YuMD;  
} fk#Ggp<  
.>`7d=KT  
"{{@N4^  
  DLL中的钩子函数如下: E?0RR'  
F&/ }x15  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) b9f5  
{ 4yu=e;C wy  
 BOOL bProcessed=FALSE; r|jBKq~  
 if(HC_ACTION==nCode)  z_C7=ga<  
 { EU5(s*A  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,! ~U5~  
   switch(wParam) c1]\.s  
   {  8W.-Y|[5?  
    case VK_MENU: =F*{O=  
     MaskBits&=~ALTBIT; < Lrd(b;  
     break; lKirc2  
    case VK_CONTROL: ~"~uXNd  
     MaskBits&=~CTRLBIT; HV3D$~gF  
     break; 51%<N\>/4  
    case VK_SHIFT: k/xNqN(  
     MaskBits&=~SHIFTBIT; ,"5p=JX`  
     break; )o_$AbPt  
    default: //judge the key and send message {XS2<!D  
     break; i];@e]   
   } vCR\lR+  
   for(int index=0;index<MAX_KEY;index++){ :;x#qtv~Iz  
    if(hCallWnd[index]==NULL) 7"_g X  
     continue; :n?}G0y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $r)nvf`\  
    { y /?;s]>b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]_)=xF19  
     bProcessed=TRUE; s&OwVQ<M  
    } |z%*}DPrpa  
   } @l2AL9z$m>  
  } M#>f:_`<  
  else if((lParam&0xc000ffff)==1){ //有键按下 -Kf'02  
   switch(wParam) zPoIs @  
   { 785Y*.p  
    case VK_MENU: t #g6rh&  
     MaskBits|=ALTBIT; }oTac  
     break; ;,&1  
    case VK_CONTROL: k@R)_,2HH  
     MaskBits|=CTRLBIT; \E<)B#  
     break; 0:Lm=9o  
    case VK_SHIFT: l:kF0tj"  
     MaskBits|=SHIFTBIT; :@X@8j":  
     break; !*xQPanL  
    default: //judge the key and send message @{n2R3)k B  
     break; Wm ?RB0  
   } dTP$7nfe  
   for(int index=0;index<MAX_KEY;index++){ 86@@j*c(@k  
    if(hCallWnd[index]==NULL) J_mpI.^Bsf  
     continue; V# 6`PD6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o'  DXd[y  
    { F;&'C$%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); hpym!G  
     bProcessed=TRUE; MgLz:2 :F  
    } f;%4O'  
   } *K\/5Fzl  
  } ^Q_0Zq^H  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 `}u~nu<  
   for(int index=0;index<MAX_KEY;index++){ L*VGdZ  
    if(hCallWnd[index]==NULL) B|~\m ~  
     continue; D058=}^HE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |xaA3UA  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G";yqG  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 $y >J=  
   } )5X7|*LP  
  } d=wzN3 ;-  
 } _"F(w"|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); TaB35glLY  
} =N n0)l  
H1=R(+-s  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: c66Iy"  
PxK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); D1lHq/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `&>!a  
J2H8r 'T  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ./ib{ @A.  
G#CWl),=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M>_S%V4a  
{ 8F4#E U  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) H, =??wN  
 { 2&!G@5  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ,)Z^b$H]  
  SaveBmp(); oc-7gz)  
  return FALSE; BbiBtU  
 } TiF$',WMv  
 …… //其它处理及默认处理 JVTG3:zD  
} g[@]OsX   
|2c'0Ibu  
zYSXG-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。 X'[S Cs  
1/w['d4l!  
  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。 ]b<k%  
7,jh44(\=  
  二、编程步骤 UmQ 9_H7  
|TEf? <"c  
  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"; \kWceu}H,  
)Hlr 09t=]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; +\.gdL)  
rMf& HX  
  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; 4U>  
jPA?0h  
  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; NY1olnI  
$o1G xz  
  5、 添加代码,编译运行程序。 bEy j8=P;  
<r 3F*S=  
三、程序代码 S <|e/![@  
@ZK|k  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL XRj<2U 5  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) lgA9p 4-  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ='OPU5(;O  
#if _MSC_VER > 1000 a*S4rq@  
#pragma once R[Kyq|UyVr  
#endif // _MSC_VER > 1000 KH2a 2  
#ifndef __AFXWIN_H__ cy/;qd+!M  
#error include 'stdafx.h' before including this file for PCH u& :-&gva  
#endif Y@^M U->+  
#include "resource.h" // main symbols "o}3i!2Qr  
class CHookApp : public CWinApp > -Jd@7-  
{ tX Z5oG7  
 public: vVZ@/D6w  
  CHookApp(); V!3O 1  
  // Overrides /o![%&-l  
  // ClassWizard generated virtual function overrides 81H04L9K 7  
  //{{AFX_VIRTUAL(CHookApp)  @;d(>_n  
 public: aLuxCobV  
  virtual BOOL InitInstance(); aeE9dV~  
  virtual int ExitInstance(); T3)/?f?|  
  //}}AFX_VIRTUAL *wyaBV?*K  
  //{{AFX_MSG(CHookApp) J0lTp /  
  // NOTE - the ClassWizard will add and remove member functions here. =JNoC01D  
  // DO NOT EDIT what you see in these blocks of generated code ! IM)\-O\Wd  
  //}}AFX_MSG 0 Co_,"  
  DECLARE_MESSAGE_MAP() WQ=C5^u  
}; E@P8-x'i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "i4@'`r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;l5F il,3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zn>*^h0B  
BOOL InitHotkey(); Ry[VEn>C1  
BOOL UnInit(); x@Z?DS$)  
#endif 86@"BNnTh  
)aOg_*~  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. srJ,Jr(  
#include "stdafx.h" ;wgm 'jr  
#include "hook.h" "DfvoQP  
#include <windowsx.h> gn#4az3@e>  
#ifdef _DEBUG ;&^S-+  
#define new DEBUG_NEW ix$?/GlL  
#undef THIS_FILE r/+ <_3  
static char THIS_FILE[] = __FILE__; (?I8/KYR  
#endif #U(dleT8  
#define MAX_KEY 100 6 }qNH29  
#define CTRLBIT 0x04  [L] ca*  
#define ALTBIT 0x02 qnv9?Xh  
#define SHIFTBIT 0x01 C-m OtI  
#pragma data_seg("shareddata") ft4J.oT  
HHOOK hHook =NULL; =?0o5|u]  
UINT nHookCount =0; \qi=Us|=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey xv9SQ,n<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT XNf%vC>  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey k P>G4$e_v  
static int KeyCount =0; 6}n>Nb;L"  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Qp!r_a&  
#pragma data_seg() a@lvn/b2  
HINSTANCE hins; *" >e k k  
void VerifyWindow(); kdITh9nx<r  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) S;MS,R  
//{{AFX_MSG_MAP(CHookApp) $^y6>@~  
// NOTE - the ClassWizard will add and remove mapping macros here. T Jp(  
// DO NOT EDIT what you see in these blocks of generated code! %#yCp2  
//}}AFX_MSG_MAP O:q 0-  
END_MESSAGE_MAP() = %\;7  
 o-_0  
CHookApp::CHookApp() >QU1_'1r  
{ 5L"{J5R}  
 // TODO: add construction code here, |u<qbl  
 // Place all significant initialization in InitInstance tB'F`HM:mq  
} 4[9~g=y>  
uqnoE;57^  
CHookApp theApp; a RC >pK.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Q: [d   
{ "+[:\  
 BOOL bProcessed=FALSE; /J<?2T9G  
 if(HC_ACTION==nCode) ="P 3TP  
 { #&\^{Z  
  if((lParam&0xc0000000)==0xc0000000){// Key up W0K&mBu  
   switch(wParam) ,[D,G  
   { L8Z[Ly+_  
    case VK_MENU: iL)q':xz  
     MaskBits&=~ALTBIT; WhMr'l/e  
     break; Ts:3_4-k  
    case VK_CONTROL: u7UqN  
     MaskBits&=~CTRLBIT; $C##S@  
     break; /Tv=BXL-  
    case VK_SHIFT: TSt-#c4B  
     MaskBits&=~SHIFTBIT; F=EAD3  
     break; t7H2z}06=h  
    default: //judge the key and send message 4^1{UlCop  
     break; R)?K+cJ%  
   } j/5>zS  
   for(int index=0;index<MAX_KEY;index++){ no?TEXp*  
    if(hCallWnd[index]==NULL) xC9^x7%3O  
     continue; :=+s^K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1uG?R  
    { ? }|;ai  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kZs  
     bProcessed=TRUE; {:$0j|zL1  
    } 7]_UZ)u  
   } {6!Mf+Xq  
  } HWxk>F0  
  else if((lParam&0xc000ffff)==1){ //Key down 4NMv7[r  
   switch(wParam) su<_?'uH  
   { Hv>A$x$q  
    case VK_MENU: 7 6~x|6)  
     MaskBits|=ALTBIT; r*C:)z .}  
     break; nchhNU  
    case VK_CONTROL: J*F-tRuEw  
     MaskBits|=CTRLBIT; 5YUn{qtD  
     break; [CGvM {  
    case VK_SHIFT: 6|r` k75.  
     MaskBits|=SHIFTBIT; ?d-(M' v.  
     break; j wlmWO6  
    default: //judge the key and send message %@'9<i8o  
     break; .J#xlOa-  
   } lY[>}L*H8  
   for(int index=0;index<MAX_KEY;index++) ICo_O] Ke  
   { 0I* ^VGZ  
    if(hCallWnd[index]==NULL) k2sb#]-/}  
     continue; , d ?4"8_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) XA5gosq  
    { .Ej `!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); P1]ucu_y,  
     bProcessed=TRUE; KYD,eVQ  
    } _SjS^z~  
   } D"j =|4S#  
  } Z7"8dlb  
  if(!bProcessed){ [Maon.t!l  
   for(int index=0;index<MAX_KEY;index++){ zL5r8mD3  
    if(hCallWnd[index]==NULL) VG*BAFs  
     continue; {g@Wd2-J}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) SE)_5|k*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); B++.tQ=X.  
   } aCcBmc  
  } Qzw~\KY:  
 } s@OCj0'l  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h`Vb#5 ik  
} .%+'Ts#ie  
p%+ 0^]v1  
BOOL InitHotkey() 8)ZWR3)+W  
{ RQWVjF#  
 if(hHook!=NULL){ QbP W_)N  
  nHookCount++; ,*Y*ov23aQ  
  return TRUE; F\Q)l+c  
 } oD4NQR  
 else *>V6KW  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); jy(,^B,]  
  if(hHook!=NULL) J5)e 7  
   nHookCount++; 8[Cp  
  return (hHook!=NULL); EXH{3E54)`  
} ?{?mAb c  
BOOL UnInit() U8]L3&~  
{  ^ 'FC.  
 if(nHookCount>1){ q#LwM]<.@>  
  nHookCount--; >&TSz5Q  
  return TRUE; H/Cv?GJF  
 } GK)3a 9;  
 BOOL unhooked = UnhookWindowsHookEx(hHook); BF<7.<,  
 if(unhooked==TRUE){ V2g,JFp&  
  nHookCount=0; Ziu f<X{  
  hHook=NULL; Wy@Z)z?  
 } V9-pY/v 9  
 return unhooked; 4q/E7n  
} EJjTf:  
.{k(4_Q?I  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g-E!*K  
{ DBAJkBs  
 BOOL bAdded=FALSE; 9Re605x Q6  
 for(int index=0;index<MAX_KEY;index++){ /O|!Sg{  
  if(hCallWnd[index]==0){ Fe.Y4\xz  
   hCallWnd[index]=hWnd; Jc~^32  
   HotKey[index]=cKey; (9';zw   
   HotKeyMask[index]=cMask; GC66n1- X  
   bAdded=TRUE; Odxq]HlbO  
   KeyCount++; H1| -f]!  
   break; 0 !9vGs  
  } 5 usfyY]z  
 } 4U<'3~RN  
 return bAdded; AJ2Xq*fk  
} l<PGUm:_  
[P OcO  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) YH)U nql  
{ $JqdI/s  
 BOOL bRemoved=FALSE; G\Hck=P[$3  
 for(int index=0;index<MAX_KEY;index++){ q?[{fcNh$  
  if(hCallWnd[index]==hWnd){ M$FXDyr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ CWE jX-  
    hCallWnd[index]=NULL; $^IuE0.  
    HotKey[index]=0; Wq0h3AjR  
    HotKeyMask[index]=0; o%h\55S  
    bRemoved=TRUE; {5.,gb@6  
    KeyCount--; -}{\C]%  
    break; 7$x@;%xd  
   } VPys  
  } 0vS%m/Zi-  
 } ?@|1>epgd  
 return bRemoved; ll1?I8}5|  
} fTY@{t  
I-kM~q_  
void VerifyWindow() ]WN{8   
{ X^_,`H@  
 for(int i=0;i<MAX_KEY;i++){ o1MbHBb  
  if(hCallWnd!=NULL){ 1)#<nk)I  
   if(!IsWindow(hCallWnd)){ BRQ9kK20  
    hCallWnd=NULL; dulW!&*No  
    HotKey=0; 1:My8  
    HotKeyMask=0; >gFF>L>  
    KeyCount--; $Y$!nPO  
   } ~W5 fJd0  
  } %!(6vm>8  
 } xVfJ ]Y  
} m f4@g05  
@ )<uQ S  
BOOL CHookApp::InitInstance() %E1~I\n:F  
{ ?j8CkqX!  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Se"\PxBR  
 hins=AfxGetInstanceHandle(); IZJV6clM  
 InitHotkey(); TUy*wp9  
 return CWinApp::InitInstance(); UT+\IzL  
} Yr-,0${m  
k49CS*I  
int CHookApp::ExitInstance() X%`8h _  
{ s<:"rw`  
 VerifyWindow(); SnQ$  
 UnInit(); d#ld*\|  
 return CWinApp::ExitInstance(); 8k_,Hni  
} S wC,=S  
*sAoYx  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xhUQ.(S`r6  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8Y5* 1E*  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ v bb mmv  
#if _MSC_VER > 1000 4$IPz7  
#pragma once ,"h$!k"$g  
#endif // _MSC_VER > 1000 `*}#Bks!  
)KXLL;]  
class CCaptureDlg : public CDialog htM5Nm[g  
{ bGK&W;Myk  
 // Construction T%P 0M*  
 public: {:6VJ0s\  
  BOOL bTray; px4Z  
  BOOL bRegistered; K/MIDH  
  BOOL RegisterHotkey(); nn#A-x}~;b  
  UCHAR cKey; 5U1@wfKE3>  
  UCHAR cMask; bXJ,L$q  
  void DeleteIcon(); N:L<ySJ7  
  void AddIcon(); eDaVoc3  
  UINT nCount; akd~Z  
  void SaveBmp(); $|(roC(  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }{iR+M X  
  // Dialog Data 14oD^`-t  
  //{{AFX_DATA(CCaptureDlg) fD,#z&  
  enum { IDD = IDD_CAPTURE_DIALOG }; 3XL0Pm  
  CComboBox m_Key; >kC@7h5)  
  BOOL m_bControl; eWwSD#N#  
  BOOL m_bAlt; >#!n"i;  
  BOOL m_bShift; DKK200j  
  CString m_Path; zc/S  
  CString m_Number; i.F[.-.  
  //}}AFX_DATA <LBMth  
  // ClassWizard generated virtual function overrides !m_'<=)B4~  
  //{{AFX_VIRTUAL(CCaptureDlg) 3D<P [.bS  
 public: 2jx""{  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /^4)V8D_S  
 protected: xFg=Tyq:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L?al2aopF  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~0/=5 dC  
  //}}AFX_VIRTUAL _;'}P2&Q  
  // Implementation `awk@  
 protected: QZh8l-!#5  
  HICON m_hIcon; /x$jd )C  
  // Generated message map functions o"[qPZd>  
  //{{AFX_MSG(CCaptureDlg) OY[N%wr!  
  virtual BOOL OnInitDialog(); 7F+f6(hB  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %eD&2$q*  
  afx_msg void OnPaint();  4jG@ #  
  afx_msg HCURSOR OnQueryDragIcon(); dr9I+c7u  
  virtual void OnCancel(); R?l>Vr  
  afx_msg void OnAbout(); $Q47>/CUc^  
  afx_msg void OnBrowse(); /8Vh G|Wb  
  afx_msg void OnChange(); !*CL>}-,  
 //}}AFX_MSG E(u[?  
 DECLARE_MESSAGE_MAP() +?mZ_sf8w  
}; VJ;'$SYx  
#endif u=ENf1{ $>  
o &Nr5S  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ty-4yK#  
#include "stdafx.h" 4{fi=BA   
#include "Capture.h" W >B:W0A  
#include "CaptureDlg.h" =q6yb@  
#include <windowsx.h> |W#^L`!G  
#pragma comment(lib,"hook.lib") {?5EOp~  
#ifdef _DEBUG ,{E'k+  
#define new DEBUG_NEW Xc Pn  
#undef THIS_FILE k)S7SbQ  
static char THIS_FILE[] = __FILE__; !3HMGzt  
#endif v t(kL(}v  
#define IDM_SHELL WM_USER+1 U6M4}q(N]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zEks4yd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _k ~bH\(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3!Bekn]  
class CAboutDlg : public CDialog &,e@pvc3  
{ }]g>PY  
 public: t5 5k#`Z  
  CAboutDlg(); ~hM4({/QN  
  // Dialog Data c-s ~q/  
  //{{AFX_DATA(CAboutDlg) ->93.sge  
  enum { IDD = IDD_ABOUTBOX }; snj+-'4T  
  //}}AFX_DATA A1YIPrav(  
  // ClassWizard generated virtual function overrides z&-3H/   
  //{{AFX_VIRTUAL(CAboutDlg) @x{;a9y  
 protected: "]JS,g {m  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NINyg"g<  
  //}}AFX_VIRTUAL I}?fy\1A&  
  // Implementation  p&ZD1qa  
 protected: :T'"%_d5  
  //{{AFX_MSG(CAboutDlg) ,Hj=]e2?  
  //}}AFX_MSG lW>bX C  
  DECLARE_MESSAGE_MAP() a nIdCOh  
}; |@d7o]eM|  
<Pf W  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) '<XG@L  
{ IClnh1=  
 //{{AFX_DATA_INIT(CAboutDlg) ri\r%x  
 //}}AFX_DATA_INIT {},G xrQm  
} E-! `6  
!FO||z(vb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) sq :ff  
{ pLk?<y  
 CDialog::DoDataExchange(pDX); t,=khZ  
 //{{AFX_DATA_MAP(CAboutDlg) ?rr%uXQjH  
 //}}AFX_DATA_MAP E@[`y:P  
} eb+[=nmP  
Jh }3AoD  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) (wbG0lu  
 //{{AFX_MSG_MAP(CAboutDlg) O<o_MZN  
 // No message handlers &4B N9`|:  
 //}}AFX_MSG_MAP d3Y#_!)  
END_MESSAGE_MAP() E5 Y92vu  
}0f[x ?V  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [qid4S~r,&  
: CDialog(CCaptureDlg::IDD, pParent) &LYU#$sj  
{ pT[C[h:  
 //{{AFX_DATA_INIT(CCaptureDlg) \9D '7/$I,  
  m_bControl = FALSE; O{%y `|m  
  m_bAlt = FALSE; #M8"b]oh6  
  m_bShift = FALSE; .\1XR  
  m_Path = _T("c:\\"); SJ+.i u/  
  m_Number = _T("0 picture captured."); .!=g  
  nCount=0; mtJI#P  
  bRegistered=FALSE; \Dr@n^hk@[  
  bTray=FALSE; lf Wxdi  
 //}}AFX_DATA_INIT *[_?4*F  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 k*lrE4::a  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); c t,p?[Q  
} IURi90Ir  
@^%zh   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Af*^u|#  
{ u^V`Ucd"R  
 CDialog::DoDataExchange(pDX); vp-)$f&  
 //{{AFX_DATA_MAP(CCaptureDlg) Pk*EnA)  
  DDX_Control(pDX, IDC_KEY, m_Key);  H\)on"  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Ym0Xl(Se  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6K* 7%8Y/G  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {]|};E[}m  
  DDX_Text(pDX, IDC_PATH, m_Path); w9z((\5  
  DDX_Text(pDX, IDC_NUMBER, m_Number); =|uX?  
 //}}AFX_DATA_MAP WFLT[j!1  
} 3pq&TYQU  
~fQ#-ekzqk  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Z&/;6[  
//{{AFX_MSG_MAP(CCaptureDlg) (wvDiW5  
 ON_WM_SYSCOMMAND() )zen"](cze  
 ON_WM_PAINT() 9-)oA+$  
 ON_WM_QUERYDRAGICON() #9p{Y}2#  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Az" 3f  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) @KNp?2a  
 ON_BN_CLICKED(ID_CHANGE, OnChange) O2A Z|[*I  
//}}AFX_MSG_MAP Ks!.$y:x  
END_MESSAGE_MAP() !y?g$e`  
A^o  
BOOL CCaptureDlg::OnInitDialog() :9K5zD  
{ *gZ4Ub|O  
 CDialog::OnInitDialog(); o),i2  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [O(78n$$  
 ASSERT(IDM_ABOUTBOX < 0xF000); }&;0:hw%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); QJ pUk%Wj  
 if (pSysMenu != NULL) .$S`J2Y  
 { K+Ehj(eF  
  CString strAboutMenu; Yc\;`C  
  strAboutMenu.LoadString(IDS_ABOUTBOX);  ae#7*B  
  if (!strAboutMenu.IsEmpty()) 8a e]tX5$  
  { q6/ o.j   
   pSysMenu->AppendMenu(MF_SEPARATOR); }^P(p?~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1 !OQxY}f  
  } O/l|\n  
 } %,>> <8  
 SetIcon(m_hIcon, TRUE); // Set big icon /1Rm^s)2z  
 SetIcon(m_hIcon, FALSE); // Set small icon cdzMao  
 m_Key.SetCurSel(0); mVU(u_lh  
 RegisterHotkey(); ZK_IK)g  
 CMenu* pMenu=GetSystemMenu(FALSE); g8}/Ln*W'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); vZ$uD,@;.  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _0^<)OSY  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 8|V6RgA%  
 return TRUE; // return TRUE unless you set the focus to a control [#uX{!q'  
} D='/-3f!F]  
--.:eFE/  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) MT;<\T  
{ Q_LPLmM  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) r~TiJ?8I  
 { hGD7/qTN  
  CAboutDlg dlgAbout; ':F{st>&H  
  dlgAbout.DoModal(); *1}9`$  
 } c?b?x 6 2  
 else Qn<J@%  
 { [-1Nn}  
  CDialog::OnSysCommand(nID, lParam); I=Ws /+  
 } <E6]8SQE  
} b*r1Jn"h  
Cl4y9|  
void CCaptureDlg::OnPaint() vF3>nN(]  
{ R7Hn8;..  
 if (IsIconic()) OsvAm'B  
 { N;RZIg(x  
  CPaintDC dc(this); // device context for painting T" 8>6a@}E  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); XQ,I Ej|  
  // Center icon in client rectangle =F8uuYX%m  
  int cxIcon = GetSystemMetrics(SM_CXICON); 'Ys"yY@  
  int cyIcon = GetSystemMetrics(SM_CYICON); b"x;i\Z0%  
  CRect rect; E{ Y0TZ+  
  GetClientRect(&rect); uoaF(F-  
  int x = (rect.Width() - cxIcon + 1) / 2; +JBhw4et;.  
  int y = (rect.Height() - cyIcon + 1) / 2; qV8;;&8r  
  // Draw the icon S #&HB  
  dc.DrawIcon(x, y, m_hIcon); h'w9=Pk~6y  
 } 8~\Fpz|Og  
 else qs 52)$  
 { Zdj~B1  
  CDialog::OnPaint(); ;Z C18@  
 } DQH _@-q  
} aztP`S$h  
4D9l Za}  
HCURSOR CCaptureDlg::OnQueryDragIcon() XC0G5rtB  
{ lb`P9mbr+  
 return (HCURSOR) m_hIcon; bo\|mvB~  
} W&BwBp]K  
%w6> 3#e  
void CCaptureDlg::OnCancel()  CG$S?  
{ HSp*lHU  
 if(bTray) RE!MX>sOEq  
  DeleteIcon(); H*EQ%BLW^,  
  CDialog::OnCancel(); DT n=WGm)  
} %!p14c*J H  
vy@;zrs  
void CCaptureDlg::OnAbout() RAXqRP,iw  
{ 6bo,x  
 CAboutDlg dlg; u|BD%5+J  
 dlg.DoModal(); 0%`\ 8  
} f9&D0x?  
76$19  
void CCaptureDlg::OnBrowse() +J_A *B  
{ (. 1<.PZp)  
 CString str; .l !:|Fd  
 BROWSEINFO bi; uSM4:!8  
 char name[MAX_PATH]; SECL(@0(^  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); BAdHGwomh  
 bi.hwndOwner=GetSafeHwnd(); k[y{&f,  
 bi.pszDisplayName=name; z`>a,X  
 bi.lpszTitle="Select folder"; 9! gmS?f  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; wToz{!n  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); J Y %B:  
 if(idl==NULL) qC.jXU?rO  
  return; ;QREwT~H  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); zu^?9k  
 str.ReleaseBuffer(); pk: ruf`)  
 m_Path=str; 8y~ Jn~t  
 if(str.GetAt(str.GetLength()-1)!='\\') \QHe0?6  
  m_Path+="\\"; E' JVf%)  
 UpdateData(FALSE); zrRt0}?xl  
}  @*%Q,$  
jr" yIC_  
void CCaptureDlg::SaveBmp() <s]K~ Vo  
{ ,^:Zf|V  
 CDC dc; #x)G2T'?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); V{ra,a*  
 CBitmap bm; H<X4R  
 int Width=GetSystemMetrics(SM_CXSCREEN); P}DrUND  
 int Height=GetSystemMetrics(SM_CYSCREEN); L1P]T4a@)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); _ CXKJ]m4  
 CDC tdc; S;i^ucAF  
 tdc.CreateCompatibleDC(&dc); A<y3Tc?Q  
 CBitmap*pOld=tdc.SelectObject(&bm); J U}XSb  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); W4|1wd}.t  
 tdc.SelectObject(pOld); WI[6 l6  
 BITMAP btm; pWbzBgM?nU  
 bm.GetBitmap(&btm); iDp]l u  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; zdU<]ge  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "MM7qV  
 BITMAPINFOHEADER bih; mK@\6GOMYP  
 bih.biBitCount=btm.bmBitsPixel; aE1h0`OT  
 bih.biClrImportant=0; yY[[)  
 bih.biClrUsed=0; nH NMoA  
 bih.biCompression=0; Ny\iRU)fN  
 bih.biHeight=btm.bmHeight;  ItC*[  
 bih.biPlanes=1; 57v[b-SK  
 bih.biSize=sizeof(BITMAPINFOHEADER); JNuo+Pq  
 bih.biSizeImage=size; f ,K1a9.  
 bih.biWidth=btm.bmWidth; k[A=:H1"  
 bih.biXPelsPerMeter=0; R:0Fv9bwS  
 bih.biYPelsPerMeter=0; "EWU:9\0  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); vb{&T<  
 static int filecount=0; i ,4  
 CString name; *=~ 9?  
 name.Format("pict%04d.bmp",filecount++); 2=(=Wjk.  
 name=m_Path+name; [q9TTJ@2  
 BITMAPFILEHEADER bfh; A6q,"BS^d  
 bfh.bfReserved1=bfh.bfReserved2=0; :==kC672  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ] bhzB  
 bfh.bfSize=54+size; 5 (2g*I  
 bfh.bfOffBits=54; wb"Jj  
 CFile bf; e`<=& w  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ cV&(L]k>`  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Itj|0PGd  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); >fdS$,`A  
  bf.WriteHuge(lpData,size); W-7yi`5  
  bf.Close(); *ZKfyn$+~  
  nCount++; &p=|z2 J  
 } F! c%&Z  
 GlobalFreePtr(lpData); x>&1;g2r  
 if(nCount==1) TnPdpynP  
  m_Number.Format("%d picture captured.",nCount); az F"tke  
 else oopTo51,a  
  m_Number.Format("%d pictures captured.",nCount); $T1 D ?X  
  UpdateData(FALSE); $-5iwZ  
} 8^c|9ow  
\1aj!)  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)  5t:4%  
{ pc^(@eD  
 if(pMsg -> message == WM_KEYDOWN) Rj^bZ%t  
 { 75Jh(hd(  
  if(pMsg -> wParam == VK_ESCAPE) rM=Q.By+\  
   return TRUE; |+x;18  
  if(pMsg -> wParam == VK_RETURN) 9i,QCA  
   return TRUE; !@ai=p  
 } 4LUFG  
 return CDialog::PreTranslateMessage(pMsg); pjIXZ=  
} < ynm A  
\hv*`ukF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) YOP=gvZq  
{ i. `S0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ N@?Fpmu/k  
  SaveBmp(); `"A\8)6-  
  return FALSE; ]Ny.  gu  
} )I.[@#-  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ wEKm3mY;  
 CMenu pop; qJ5Y}/r  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); z/6kxV89  
 CMenu*pMenu=pop.GetSubMenu(0); ~WR6rc  
 pMenu->SetDefaultItem(ID_EXITICON); afG b}8 Q9  
 CPoint pt; 9t7_7{Q+;  
 GetCursorPos(&pt); !<((@*zU  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); mBQ6qmK   
 if(id==ID_EXITICON) 3AX/A+2  
  DeleteIcon(); )q&uvfQ1(  
 else if(id==ID_EXIT) 4q~+K' Z  
  OnCancel(); Ct$e`H!;  
 return FALSE; QOy+T6en  
} DH)@8)C  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); niqiDT/  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) D-E30b]e  
 AddIcon(); _2}i8q:  
 return res; :E@"4O?<Y)  
} -]W AB9  
c<pr1g  
void CCaptureDlg::AddIcon() [M Z'i/  
{ IUbYw~f3  
 NOTIFYICONDATA data; + :iNoDz  
 data.cbSize=sizeof(NOTIFYICONDATA); :HMnU37m W  
 CString tip; A5!f#  
 tip.LoadString(IDS_ICONTIP); /3'-+bp^=  
 data.hIcon=GetIcon(0); ;u!>( QQ  
 data.hWnd=GetSafeHwnd(); Mm^o3vl  
 strcpy(data.szTip,tip); 3MNo&0M9  
 data.uCallbackMessage=IDM_SHELL; ]*ZL>fuD|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ,%v  
 data.uID=98; ASR"<]  
 Shell_NotifyIcon(NIM_ADD,&data); xh_6@}D2J  
 ShowWindow(SW_HIDE); :T5l0h-eC  
 bTray=TRUE; PZeVjL?E  
} }`h)+Im=  
^3*/x%A,g  
void CCaptureDlg::DeleteIcon() I$9 t^82j  
{ 5~aSkg,MD  
 NOTIFYICONDATA data; oPo<F5M]d%  
 data.cbSize=sizeof(NOTIFYICONDATA);  x)THeH@  
 data.hWnd=GetSafeHwnd(); o_b j@X  
 data.uID=98; /DQoM@X  
 Shell_NotifyIcon(NIM_DELETE,&data); 9_ KUUA  
 ShowWindow(SW_SHOW); w# ,:L)  
 SetForegroundWindow(); >9uDY+70I3  
 ShowWindow(SW_SHOWNORMAL); hi`\3B  
 bTray=FALSE; FL/@e$AK  
} "9&6bBa  
zRL[.O9  
void CCaptureDlg::OnChange() 4F)z-<-b  
{ .!l#z|/x  
 RegisterHotkey(); \_De( p  
} #wk'&XsC#z  
6EGh8H f  
BOOL CCaptureDlg::RegisterHotkey() zw7=:<z=  
{ 8QXxRD;0:  
 UpdateData(); ;oH%d;H  
 UCHAR mask=0; u6awcn  
 UCHAR key=0; z )a8 ^]`  
 if(m_bControl) ]y2(ZTNTs  
  mask|=4; R1 hb-  
 if(m_bAlt) ]Tx8ImD#)A  
  mask|=2; VbKky1a@  
 if(m_bShift) mxGa\{D# y  
  mask|=1; vd9l1"S  
  key=Key_Table[m_Key.GetCurSel()]; `~(KbH=]  
 if(bRegistered){ H}dsd=yO  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); do+HPnfDzU  
  bRegistered=FALSE; tceQn ^|<  
 } 5m=3{lBi  
 cMask=mask; *&% kkbA  
 cKey=key; :PY~Cws  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); qyP@[8eH  
 return bRegistered; TStu)6%`  
} TsfOod   
P%ev8]2  
  四、小结 6wqq"6w  
b U-Cd  
  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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