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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: Pa0W|q#?X  
  d6*84'|!  
  一、实现方法 U - OD  
-V;Y4,:c  
  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: ox`Zs2-a  
ppn  8  
#pragma data_seg("shareddata") <QvVPE}z   
HHOOK hHook =NULL; //钩子句柄 RuYIG?J=/  
UINT nHookCount =0; //挂接的程序数目 67&IaDts  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 I)1ih  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  Mj1f;$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :(ql=+vDb4  
static int KeyCount =0; D$4GNeB+#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 'z,kxra|n  
#pragma data_seg() \5&Mg81  
]cP%d-x}  
  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。 ^@8XJ[C,_  
`},:dDHI  
  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: dakHH@Q  
;UgwV/d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR @k;65'"Q  
cKey,UCHAR cMask) VD&wO'U  
{ @yb'h`f]  
 BOOL bAdded=FALSE; M2ex 3m  
 for(int index=0;index<MAX_KEY;index++){ f_O|  
  if(hCallWnd[index]==0){ 8D`+3  
   hCallWnd[index]=hWnd; Xj+_"0 #  
   HotKey[index]=cKey; I2HV{1(i  
   HotKeyMask[index]=cMask; i/-IjgM"-  
   bAdded=TRUE; Epp>L.?r  
   KeyCount++; .S|T{DMQ[  
   break; j;uUM6  
  } > "rM\ Q  
 } %[KnpJ{\  
 return bAdded; nI?*[y}  
} @d{}M)6\!  
//删除热键 1 Q FsT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q8Ek}O\MC  
{ 5@1h^w v  
 BOOL bRemoved=FALSE; *JX$5bZsI  
 for(int index=0;index<MAX_KEY;index++){ &Qda|  
  if(hCallWnd[index]==hWnd){ N LpKh1g  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ SaGI4O_\s  
    hCallWnd[index]=NULL; tH;9"z# ~  
    HotKey[index]=0; %8I^&~E1  
    HotKeyMask[index]=0; G"&$7!6[Y  
    bRemoved=TRUE; H +I,c1sF  
    KeyCount--; -w2^26 ax  
    break; {J1rjrPo  
   }  "2%R?  
  } D3aX\ NGP  
 } KO8vUR*2R  
 return bRemoved; 2m*ugBO;  
} p' ^}J$  
t)8c rX}P  
j%3 $ytf|p  
  DLL中的钩子函数如下: Tx&H1  
**__&X p1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bj0HAgY@  
{ 32+N?[9 *  
 BOOL bProcessed=FALSE; fhZwYx&t  
 if(HC_ACTION==nCode) Q (N'Oj:J  
 { 0_je@p+$  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ynra%"sd  
   switch(wParam) "UD)3_R  
   {  {BM:c$3@j  
    case VK_MENU: VB  |k  
     MaskBits&=~ALTBIT; Mz$qe  
     break; b/\O;o}]  
    case VK_CONTROL: Z(RsB_u5  
     MaskBits&=~CTRLBIT; )x [=}0C  
     break; ?z M   
    case VK_SHIFT: |mG;?>c)  
     MaskBits&=~SHIFTBIT; 1f^oW[w&  
     break; ,[p?u']yZz  
    default: //judge the key and send message BeRs;^r+  
     break; yg}L,JJU<  
   } _3wJ;cn.  
   for(int index=0;index<MAX_KEY;index++){ qDswFs(  
    if(hCallWnd[index]==NULL) "K>!+<  
     continue; E l.eK9L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dk]  
    { B> i^w1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); N%:uOX8{  
     bProcessed=TRUE; 7.NL>:lu  
    } JYjc^m  
   } 1*9Yy~w  
  } `4@` G:6BL  
  else if((lParam&0xc000ffff)==1){ //有键按下 :, H_ e! X  
   switch(wParam) .Sw4{m[g  
   { </<z7V,{  
    case VK_MENU: n@@tO#!\  
     MaskBits|=ALTBIT; tZ=|1lM  
     break; ^{yb4yQ 0  
    case VK_CONTROL: P/~dY  
     MaskBits|=CTRLBIT; 8z=o.\@  
     break; |#*+#27  
    case VK_SHIFT: 4ybOK~z  
     MaskBits|=SHIFTBIT; HSG9|}$  
     break; #F .8x@  
    default: //judge the key and send message wAR:GO'n  
     break; .w m<l:  
   } ZPM7R3%V)z  
   for(int index=0;index<MAX_KEY;index++){ T5pc%%q  
    if(hCallWnd[index]==NULL) 2mj>,kS?c  
     continue; -$s1k~o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L}8 }Pns?&  
    { #9"lL1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); j }^?Snq  
     bProcessed=TRUE; rf$[8d  
    } jkuNafp}  
   } )tV]h#4  
  } !Y^$rF-+  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &e[Lb:Uk)  
   for(int index=0;index<MAX_KEY;index++){ hhjsg?4uL  
    if(hCallWnd[index]==NULL) (#je0ES  
     continue; .q]K:}9!\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) IP !zg|c,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); IMSm  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 QKz2ONV=)  
   } $\4Or  
  } z5:3.+M5  
 } E.VEW;=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /KvpJ4  
} Z#%77!3  
)Knsy  
  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: `b@"GOr  
OZ Obx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1 d.>?^uE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); y;9K  
NVC$8imip  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: )[sSCt]  
#@5 jOi  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) CA"`7<,  
{ n |,}   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4P24ySy9F  
 { BYS>"  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @qJv  
  SaveBmp(); d<;XQ.Wo7  
  return FALSE; iN`L*h  
 } ER$~kFE2yP  
 …… //其它处理及默认处理 kS7T'[d  
} Y50$ 2%kM  
~0.@1zEXj  
Ug O\+cI  
  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。 >y q L  
oWOH#w  
  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。 z#&qWO  
\}qv}hU  
  二、编程步骤 ]@1ncn7N  
h"nv[0!)  
  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"; 0$nJd_gW_  
U`'w{~"D%  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :(x 90;DW  
/%N~$ &wW  
  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; b}q,cm  
]zK} X!  
  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; aR;Q^YJ+a  
?at~il$z'  
  5、 添加代码,编译运行程序。 {la ^useg[  
R ?\8SdJ  
三、程序代码 Un[#zh<4  
&jPsdv h  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL gzdgnF2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 8|Y^z_C  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~yf5$~Z  
#if _MSC_VER > 1000 {gi"ktgk  
#pragma once 1Kebl  
#endif // _MSC_VER > 1000 veE8 N~0N.  
#ifndef __AFXWIN_H__ kp;MNRc  
#error include 'stdafx.h' before including this file for PCH Z#W`0G>'  
#endif L,X6L @Q  
#include "resource.h" // main symbols 9k"nx ,"  
class CHookApp : public CWinApp +~/zCJ;F  
{ \J\1i=a-=  
 public: CblL1q8  
  CHookApp(); f%auz4CZz  
  // Overrides /3Gv51'  
  // ClassWizard generated virtual function overrides Ox43(S0~  
  //{{AFX_VIRTUAL(CHookApp) )5V1H WjU  
 public: C ILk  
  virtual BOOL InitInstance(); cRfX  
  virtual int ExitInstance(); C"mb-n 7s  
  //}}AFX_VIRTUAL KoXXNJax  
  //{{AFX_MSG(CHookApp) J<zg 'Jk^  
  // NOTE - the ClassWizard will add and remove member functions here. 4Y/!V[  
  // DO NOT EDIT what you see in these blocks of generated code ! uc"u@ _M  
  //}}AFX_MSG wLUmRo56aR  
  DECLARE_MESSAGE_MAP() >zhbipA  
};  3i$AR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ZmHl~MR@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |$0/:*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SI(8.$1  
BOOL InitHotkey(); )*JTxMQ  
BOOL UnInit(); %yrP: fg/  
#endif O@Kr}8^,  
Ua3ERBX{  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. BR%:`uiQ<  
#include "stdafx.h" (c_hX(  
#include "hook.h" ^ pR&  
#include <windowsx.h> a:]yFi:Su  
#ifdef _DEBUG 1-[{4{R  
#define new DEBUG_NEW (jyJ-qe  
#undef THIS_FILE MR6vr.~  
static char THIS_FILE[] = __FILE__;  JuI,wA  
#endif 4'8.f5  
#define MAX_KEY 100 / q!&I  
#define CTRLBIT 0x04 @<sP1`1  
#define ALTBIT 0x02 Z,&ywMm/G  
#define SHIFTBIT 0x01 5LK>n-  
#pragma data_seg("shareddata") ]- `{kX  
HHOOK hHook =NULL; =f p(hX"  
UINT nHookCount =0; g?+P&FL#I  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey DpR%s",Q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT \d;Ow8%d/  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey n C Z  
static int KeyCount =0; Fy@D&j  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift d$Xvax,C  
#pragma data_seg() U\z+{]<<  
HINSTANCE hins; ?0<3"2Db~  
void VerifyWindow();  t|DYz#]  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =w5w=qB  
//{{AFX_MSG_MAP(CHookApp) rYqvG  
// NOTE - the ClassWizard will add and remove mapping macros here. 33C#iR1(WJ  
// DO NOT EDIT what you see in these blocks of generated code! lqs_7HhvRS  
//}}AFX_MSG_MAP /4 f;Niem  
END_MESSAGE_MAP() 8| /YxF<  
x/<. ?[A  
CHookApp::CHookApp() C!P6Z10+j  
{ 5-QXvw(TH  
 // TODO: add construction code here, ~!OjdE!u  
 // Place all significant initialization in InitInstance U#P#YpD;==  
} "8X+F%  
ij),DbWd  
CHookApp theApp; G#*;3X$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6bn-NY:i  
{ b +_E)4  
 BOOL bProcessed=FALSE; }1P  
 if(HC_ACTION==nCode) J5"*OH:f  
 { *$1)&2i  
  if((lParam&0xc0000000)==0xc0000000){// Key up 5%$#3LT|  
   switch(wParam) 3WY W])  
   { m}E$6E^~O  
    case VK_MENU: koU.`l.  
     MaskBits&=~ALTBIT; td~3N,S  
     break; #]'xUgcE9  
    case VK_CONTROL: cG'Wh@  
     MaskBits&=~CTRLBIT; Ww~0k!8,t  
     break; l9h;dI{6  
    case VK_SHIFT: =EJ"edw]%0  
     MaskBits&=~SHIFTBIT; \4[Ta,;t  
     break; tQ67XAb  
    default: //judge the key and send message {mQJ6 G'ny  
     break; #@fypCc  
   } 2 ^aTW`>L  
   for(int index=0;index<MAX_KEY;index++){ >seB["C  
    if(hCallWnd[index]==NULL) BSY#xe V  
     continue; m @%|Q;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wMoAvA_oS  
    { bW]+Og  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +*q@=P,  
     bProcessed=TRUE; ;<A/e  
    } 5dk,!Cjg  
   } YovY0nO  
  } v=>Gvl3&U  
  else if((lParam&0xc000ffff)==1){ //Key down URgF8?n  
   switch(wParam) pS \>X_G3  
   { C(t/:?(y  
    case VK_MENU: ._Xtb,p{  
     MaskBits|=ALTBIT; Xn=fLb(  
     break; K;l'IN"N  
    case VK_CONTROL: :S12=sFl$  
     MaskBits|=CTRLBIT; ?+\,a+46P_  
     break; 7fqYSMHR  
    case VK_SHIFT: Dhoj|lc  
     MaskBits|=SHIFTBIT; I1~g?jpH  
     break; |9I;`{@  
    default: //judge the key and send message O)R0,OPb  
     break; B .mV\W  
   } M}Mzm2d#`  
   for(int index=0;index<MAX_KEY;index++) !Xi>{nV  
   { D,/9rH  
    if(hCallWnd[index]==NULL) vp@+wh]#  
     continue; (/U1J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @\?f77Of6  
    { +IYSWR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); vNbA/sM  
     bProcessed=TRUE; 6pR#z@,  
    } aw1J#5j`n  
   } M'iKk[Hjfx  
  } X;:xGZ-oY  
  if(!bProcessed){ +kL(lBv'  
   for(int index=0;index<MAX_KEY;index++){ dk/*%a +  
    if(hCallWnd[index]==NULL) N}G(pq}  
     continue; 1`{ib  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r.;iO0[/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rR~X>+K  
   } H)Ge#=;ckQ  
  } P;&p[[7  
 } N~jQ!y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p%1m&/ `F  
} [!mjUsut*  
1.uQ(>n  
BOOL InitHotkey() su;S)yZb  
{ a7G2C oM8  
 if(hHook!=NULL){ di2=P)3  
  nHookCount++; /g''-yT7#  
  return TRUE; ASw |sw  
 } ':]a.yA\1  
 else V bOLTc  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); RfG$Px '  
  if(hHook!=NULL) +hgCk87%#  
   nHookCount++; <v k$eB8EC  
  return (hHook!=NULL); Ai18]QD-  
}  u$8MVP  
BOOL UnInit() Cl!jK^AbG  
{ {1|7N GQ  
 if(nHookCount>1){ ZF (=^.gc  
  nHookCount--; {C6;$#7P  
  return TRUE; UE w3AO  
 } l$_rA~Mo  
 BOOL unhooked = UnhookWindowsHookEx(hHook); z&,sm5Lb  
 if(unhooked==TRUE){ T l(uqY?9  
  nHookCount=0; |9]K:A  
  hHook=NULL; Tpx,41(k  
 } 98'XSL|  
 return unhooked; %0]b5u  
} [_b='/8  
}Xv1KX'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I>Fh*2  
{ a&Du5(r;!  
 BOOL bAdded=FALSE; XF$]KA L0  
 for(int index=0;index<MAX_KEY;index++){ )%w8>1 }c  
  if(hCallWnd[index]==0){ DW&')gfQ  
   hCallWnd[index]=hWnd; yuDd% 1k  
   HotKey[index]=cKey; !13 /+ u  
   HotKeyMask[index]=cMask; u#k ,G`  
   bAdded=TRUE; i!x5T%x_  
   KeyCount++; @|%ICG c  
   break; eh4"_t  
  } S@NhEc  
 } 3MJWCo-[  
 return bAdded; 9= $,]M  
} =3dbw8I  
<|Eby!KXR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |S`yXsg  
{ 'xoE [0!  
 BOOL bRemoved=FALSE; @k6}4O?{  
 for(int index=0;index<MAX_KEY;index++){ +{!t~BW  
  if(hCallWnd[index]==hWnd){ {eN{Zh5"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ FKnQwX.0  
    hCallWnd[index]=NULL; <D;Q8  
    HotKey[index]=0; bu]Se6%}  
    HotKeyMask[index]=0; X3iRR{< @  
    bRemoved=TRUE; Ds,"E#?  
    KeyCount--; aw%vu  
    break; wf< `J/7u  
   } Tc5OI'-V  
  } 3l(;Pt-yI  
 } |O+>#  
 return bRemoved; qS}RFM5|  
} 0*/ r'  
ur,"K' w  
void VerifyWindow() bTy)0ta>AF  
{ <;0N@  
 for(int i=0;i<MAX_KEY;i++){ ';|>`<  
  if(hCallWnd!=NULL){ Hs -.83V  
   if(!IsWindow(hCallWnd)){ _QUu'zJ  
    hCallWnd=NULL; \If!5N  
    HotKey=0; u+'@>%7  
    HotKeyMask=0; [piF MxZP  
    KeyCount--; hIo S#]  
   } ^npS==Y]!.  
  } :F w"u4WI  
 } K(KP3Q  
} gXLZ)>+A+  
\{=`F`oB=  
BOOL CHookApp::InitInstance() m<,G:?RM  
{ 3et2\wOX1x  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); V&j.>Y  
 hins=AfxGetInstanceHandle(); C\^<v&  
 InitHotkey(); AH 87UkNL  
 return CWinApp::InitInstance(); 6O@ ^`T  
} m#'rI=}!  
Q1I_=fT  
int CHookApp::ExitInstance() *5_ 8\7d  
{ y_4krY|Zx  
 VerifyWindow(); #JR,C -w  
 UnInit(); &c?hJ8"  
 return CWinApp::ExitInstance(); Ed0>R<jR9  
} |]!Ky[P  
$x_52 j\j  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file LVFsd6:h  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) uyRA`<&w  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7}tZ?vD  
#if _MSC_VER > 1000 t6g)3F7T  
#pragma once w H_n$w  
#endif // _MSC_VER > 1000 iraRB~  
-=t3O#  
class CCaptureDlg : public CDialog 6n6VEwYj  
{ E%\7Uo-  
 // Construction PVS<QN%  
 public: ) 4L%zl7  
  BOOL bTray; V3A>Ag+^~  
  BOOL bRegistered; /$Tl#   
  BOOL RegisterHotkey(); Sd<@X@iU8D  
  UCHAR cKey; +`s&i%{1>  
  UCHAR cMask; h6T/0YhWLP  
  void DeleteIcon(); [' OCw {<  
  void AddIcon(); 1S[5#ewB;j  
  UINT nCount; ^'u;e(AaE  
  void SaveBmp(); t3#H@0<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor F2PLy q  
  // Dialog Data tC@zM.v%  
  //{{AFX_DATA(CCaptureDlg) mQ ^ @ \s  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ad`[Rt']kI  
  CComboBox m_Key; B`?N0t%X  
  BOOL m_bControl; +/!=Ub[:U  
  BOOL m_bAlt; A{8K#@!  
  BOOL m_bShift; 0nD=|W\@{  
  CString m_Path; qv0 DrL,3  
  CString m_Number; 'Elj"Iiu  
  //}}AFX_DATA u_6BHsU  
  // ClassWizard generated virtual function overrides Iz GB  
  //{{AFX_VIRTUAL(CCaptureDlg) R<lNk<  
 public: ]zvVY:v  
  virtual BOOL PreTranslateMessage(MSG* pMsg); +>!B(j\gx  
 protected: 3b?OW7H  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8pq-nuf|K  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); lA.;ZD!  
  //}}AFX_VIRTUAL aO^:dl5  
  // Implementation wSJ]3gJM`  
 protected: %7(kP}y*  
  HICON m_hIcon; >NH4A_  
  // Generated message map functions Oa}V>a  
  //{{AFX_MSG(CCaptureDlg) VTJIaqw  
  virtual BOOL OnInitDialog(); i#]aV]IT  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,na=~.0R:  
  afx_msg void OnPaint(); N,/BudF o  
  afx_msg HCURSOR OnQueryDragIcon(); L'\/)!cEd  
  virtual void OnCancel(); 8R)D! 7[l  
  afx_msg void OnAbout(); 3m43nJ.~  
  afx_msg void OnBrowse(); "'F;lzq  
  afx_msg void OnChange(); 0Y6q$h>4  
 //}}AFX_MSG gP %|:"  
 DECLARE_MESSAGE_MAP() znQ'm^h  
}; `j}_BW_  
#endif _Vo)<--+I  
pVV}1RDa  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file vhYMWfbY  
#include "stdafx.h" `dgM|.w5=  
#include "Capture.h" !O F?xW  
#include "CaptureDlg.h" ;Y@!:p- H  
#include <windowsx.h> >St. &#c  
#pragma comment(lib,"hook.lib") f E.L  
#ifdef _DEBUG s,$Z ("B  
#define new DEBUG_NEW WG8iTVwx  
#undef THIS_FILE y7M:b Uh  
static char THIS_FILE[] = __FILE__; ?y>Y$-v/C  
#endif @3 -,=x  
#define IDM_SHELL WM_USER+1 a)_rka1(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uEScAeQXsI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'n l RY5@2  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; && DD  
class CAboutDlg : public CDialog 3qAwBVWa  
{ m1hW<  
 public: u( 1J=h  
  CAboutDlg(); jJ*@5?A  
  // Dialog Data <DeKs?v  
  //{{AFX_DATA(CAboutDlg) Ue{vg$5||  
  enum { IDD = IDD_ABOUTBOX }; 2/yXY_L  
  //}}AFX_DATA e$Xq    
  // ClassWizard generated virtual function overrides C5PmLiOHY>  
  //{{AFX_VIRTUAL(CAboutDlg) $Wr\ [P:  
 protected: tLD~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *t#s$Ga  
  //}}AFX_VIRTUAL A$%Q4jC}  
  // Implementation >Lw}KO`  
 protected: UTDcX  
  //{{AFX_MSG(CAboutDlg) 5!'R'x5e  
  //}}AFX_MSG HDF!`  
  DECLARE_MESSAGE_MAP() o%Be0~n'  
}; AezvBY0'`z  
~|CJsD/  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) F-BJe]  
{ *<*0".#  
 //{{AFX_DATA_INIT(CAboutDlg) & Fg|%,fv]  
 //}}AFX_DATA_INIT -,~;qSs  
} %s$rP  
*M> iZO*@  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) JcTp(fnW.~  
{ vix&E`0yD  
 CDialog::DoDataExchange(pDX); V&Xi> X8  
 //{{AFX_DATA_MAP(CAboutDlg) y4xT:G/M  
 //}}AFX_DATA_MAP E /fw?7eQ  
} 4GG1E. z}  
$?FS00p*|X  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7$!`p,@we/  
 //{{AFX_MSG_MAP(CAboutDlg) AIZW@Nq.5  
 // No message handlers "wA0 LH_  
 //}}AFX_MSG_MAP V I6\   
END_MESSAGE_MAP() M"=8O>NZ2  
$hG;2v  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) EKZ$Q4YE  
: CDialog(CCaptureDlg::IDD, pParent) s<A*[  
{ Q~fwWp-J  
 //{{AFX_DATA_INIT(CCaptureDlg) DE*MdfP0  
  m_bControl = FALSE; *0%4l_i  
  m_bAlt = FALSE; )n\*ht7  
  m_bShift = FALSE; SU?wFCGT%  
  m_Path = _T("c:\\"); i(Ip(n  
  m_Number = _T("0 picture captured."); p= !#],[  
  nCount=0; aB6Ye/Io  
  bRegistered=FALSE; 1<xcMn0et  
  bTray=FALSE; KxO/]  
 //}}AFX_DATA_INIT ,f} h}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 H4M{_2DO  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); NH'1rt(w  
} Eo%UuSi  
BG'6;64kx6  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 8AT;8I<K  
{ 2HcsQ*H] G  
 CDialog::DoDataExchange(pDX); cyW;,uT)D  
 //{{AFX_DATA_MAP(CCaptureDlg) SHMl%mw  
  DDX_Control(pDX, IDC_KEY, m_Key); :e1'o  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ^9&b+u=X  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Da"yZ\4  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); PC*m% ?+  
  DDX_Text(pDX, IDC_PATH, m_Path); CN$I:o04C  
  DDX_Text(pDX, IDC_NUMBER, m_Number); `5~7IPl3  
 //}}AFX_DATA_MAP 6fh{lx>  
} ecn}iN  
's)fO#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G49Ng|qn  
//{{AFX_MSG_MAP(CCaptureDlg) )T>8XCL\}  
 ON_WM_SYSCOMMAND() 82lr4  
 ON_WM_PAINT() $Axng J c  
 ON_WM_QUERYDRAGICON() <5dH *K  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) x+4v s s  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) iJ}2"i7M  
 ON_BN_CLICKED(ID_CHANGE, OnChange) (nGkZ}p  
//}}AFX_MSG_MAP F[5S(7M 7  
END_MESSAGE_MAP() HtxLMzgz<<  
#nKRTb+{  
BOOL CCaptureDlg::OnInitDialog() g^1r0.Sp{8  
{ _3|6ZO  
 CDialog::OnInitDialog(); Vl<`|C>  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); aiYo8+{!#  
 ASSERT(IDM_ABOUTBOX < 0xF000); kEO1TS  
 CMenu* pSysMenu = GetSystemMenu(FALSE); _*Pfp+if  
 if (pSysMenu != NULL) aC`Li^  
 { }/20%fP  
  CString strAboutMenu; cn$5:%IK  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Sa Cx)8ul0  
  if (!strAboutMenu.IsEmpty()) 'f 3HKn<L  
  { PC|'yAN:  
   pSysMenu->AppendMenu(MF_SEPARATOR); lqF>=15  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~L~]QN\3  
  } u=%y  
 } o~= iy  
 SetIcon(m_hIcon, TRUE); // Set big icon s3seK6x'  
 SetIcon(m_hIcon, FALSE); // Set small icon !Q!&CG5l  
 m_Key.SetCurSel(0); i<mevL  
 RegisterHotkey(); Rfht\{N 7  
 CMenu* pMenu=GetSystemMenu(FALSE); <KtBv Ip]  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 5:c;RRn  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +kM\ D~D1  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {ih:FcI  
 return TRUE; // return TRUE unless you set the focus to a control a2o.a 2  
} d<#p %$A4  
T8U[xu.>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) V7:\q^$  
{ r&SO:#rOSM  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) I:F <vE  
 { /u=aX  
  CAboutDlg dlgAbout; >5.zk1&H  
  dlgAbout.DoModal(); @l{I[pp  
 } )S2iIi;Bq  
 else mf}\s]_c  
 { >PIPp7C  
  CDialog::OnSysCommand(nID, lParam); I]jX7.fx  
 } "J& (:(:  
} &3I$8v|!?  
c}%es=@  
void CCaptureDlg::OnPaint() Ah (iE  
{ gGI8t@t:  
 if (IsIconic()) >60"p~t  
 { ;}D-:J-z_  
  CPaintDC dc(this); // device context for painting y:.?5KsPI  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !N1J@LT5h  
  // Center icon in client rectangle SiV*WxQe  
  int cxIcon = GetSystemMetrics(SM_CXICON); ugI#ZFjJWE  
  int cyIcon = GetSystemMetrics(SM_CYICON); x9%-plP  
  CRect rect; \ n_3Bwd~  
  GetClientRect(&rect); #&V5H{  
  int x = (rect.Width() - cxIcon + 1) / 2; 80}4/8  
  int y = (rect.Height() - cyIcon + 1) / 2; kbhX?; <`  
  // Draw the icon x6ahZ  
  dc.DrawIcon(x, y, m_hIcon); 9<l-NU9 _  
 } Zi/-~')E  
 else 6 Uw;C84!  
 { NI8~QeGah  
  CDialog::OnPaint();  i S  
 } Ihg~Q4t  
} VHW`NP 5Jl  
,E?4f @|X  
HCURSOR CCaptureDlg::OnQueryDragIcon() "Hht g:  
{ Ukc'?p,*  
 return (HCURSOR) m_hIcon; jn$j^ 51`C  
} wWTQ6~Y%d  
'0RRFO  
void CCaptureDlg::OnCancel() "U{,U`@?  
{ r1G8]agO  
 if(bTray) 4 \ F P  
  DeleteIcon(); |'<vrn  
  CDialog::OnCancel(); xl8#=qmCD  
} y\#o2PVmY  
1"O&40l  
void CCaptureDlg::OnAbout() 4)^vMG&  
{ RL*]g*  
 CAboutDlg dlg; #h N.=~  
 dlg.DoModal(); #V[SQ=>x[  
} | ]# +v@  
C_G1P)k  
void CCaptureDlg::OnBrowse() IY)5.E _  
{ SKR;wu  
 CString str; TV=c,*TV  
 BROWSEINFO bi; K2HvI7$-  
 char name[MAX_PATH]; ZoxS*Xk  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /cfHYvnz  
 bi.hwndOwner=GetSafeHwnd(); Rg&19 }BU  
 bi.pszDisplayName=name; -NzTqLBn  
 bi.lpszTitle="Select folder"; gI{ =0  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; <HF-2?`  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); bMmra.x4L  
 if(idl==NULL) 9|=nV|R'6  
  return; 5 `=KyHi:b  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [4>r6Hqxr  
 str.ReleaseBuffer(); =/9<(Tt%m  
 m_Path=str; @.ZL7$|d  
 if(str.GetAt(str.GetLength()-1)!='\\') io2@}xZF  
  m_Path+="\\"; oy5+ }`  
 UpdateData(FALSE); -k{ Jp/-D  
} L\L"mc|O  
7|Dn+ =  
void CCaptureDlg::SaveBmp() lw[<STpD;  
{ ([KN*OF  
 CDC dc; f`|G]da-3o  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); fY_%33_I$  
 CBitmap bm; TwFb%YM  
 int Width=GetSystemMetrics(SM_CXSCREEN); Z`s!dV]e9  
 int Height=GetSystemMetrics(SM_CYSCREEN); )6{P8k4Zr  
 bm.CreateCompatibleBitmap(&dc,Width,Height); "w&/m}E,[  
 CDC tdc; O]{*(J/t  
 tdc.CreateCompatibleDC(&dc); _|<BF  
 CBitmap*pOld=tdc.SelectObject(&bm); $<OhGk-  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ug#<LO-.Rd  
 tdc.SelectObject(pOld); 2-mQt_ i  
 BITMAP btm; # X/Q  
 bm.GetBitmap(&btm); E[?kGR[  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; _{Y$o'*#I  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); gS$A   
 BITMAPINFOHEADER bih; 4AHL3@x  
 bih.biBitCount=btm.bmBitsPixel; e4[) WNR  
 bih.biClrImportant=0; dy:d=Z  
 bih.biClrUsed=0; _Adsq8sFW  
 bih.biCompression=0; p{.8_#O%S  
 bih.biHeight=btm.bmHeight; d>!p=O`>{q  
 bih.biPlanes=1; {/ &B!zvl  
 bih.biSize=sizeof(BITMAPINFOHEADER); h8 =h >W-  
 bih.biSizeImage=size; Qra>}e%*  
 bih.biWidth=btm.bmWidth; RmOyGSO  
 bih.biXPelsPerMeter=0; 4seciz0?  
 bih.biYPelsPerMeter=0; f#P_xn&et  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); x?L hq2  
 static int filecount=0; V]c5 Z$Bd  
 CString name; }V]eg,.BJ  
 name.Format("pict%04d.bmp",filecount++); J]fS({(\I  
 name=m_Path+name; |zpx)8Q  
 BITMAPFILEHEADER bfh; :;4SQN{2 O  
 bfh.bfReserved1=bfh.bfReserved2=0; yvxl_*Ds8  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ^>m^\MuZ  
 bfh.bfSize=54+size; V;93).-$  
 bfh.bfOffBits=54; Dp^/gL=  
 CFile bf; a)S7}0|R  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ J^ ={}  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); cy1jZ1)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); lIh[|]  
  bf.WriteHuge(lpData,size); ]y LhJ_^  
  bf.Close(); " H1:0p  
  nCount++; W-D[z#)/Y  
 } kG^dqqn6  
 GlobalFreePtr(lpData); l~1AT%  
 if(nCount==1) &&PgOFD  
  m_Number.Format("%d picture captured.",nCount); xR908+>5  
 else >Z\BfH  
  m_Number.Format("%d pictures captured.",nCount); V`k8j-*s  
  UpdateData(FALSE); Bq!cY Wj  
} s'L?;:)dyB  
L'9N9CR{i  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Ro r2qDF  
{ LC-)'Z9}5  
 if(pMsg -> message == WM_KEYDOWN) (vQ+e  
 {  U:|H9+5  
  if(pMsg -> wParam == VK_ESCAPE) J&6:d  
   return TRUE; Gzm$OHbn  
  if(pMsg -> wParam == VK_RETURN) U8O(;+  
   return TRUE; zj%cQkZ  
 } 1S%}xsR0  
 return CDialog::PreTranslateMessage(pMsg); " s]y!BLk  
} GDPo`# ~  
HFS+QwHW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) jvs[ /  
{ 6c<ezEJ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |Td5l?  
  SaveBmp(); FC}oL"kk  
  return FALSE; >n!ni(  
} Nl*i5 io  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){  r(`nt-o@  
 CMenu pop; 7& 6Y  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); R]Qp Mj%o  
 CMenu*pMenu=pop.GetSubMenu(0); ~L4eZ  
 pMenu->SetDefaultItem(ID_EXITICON); Ze ? g  
 CPoint pt; 0ar=cuDm  
 GetCursorPos(&pt); |F!F{d^p  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); , Oli  
 if(id==ID_EXITICON) @vs@>CYdz  
  DeleteIcon(); ~7SH4Cr  
 else if(id==ID_EXIT) aqr!oxn?t  
  OnCancel(); _!AJiP3!)4  
 return FALSE; (wA?;]q(  
} U:lv^ QPG  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }*kJ-q&0  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _V@P-Ye  
 AddIcon(); #WufZ18#  
 return res; '6zd;l9Z  
} 2u:4$x8  
,7,;twKz  
void CCaptureDlg::AddIcon() 9*}gl3y  
{ ,{{SI  
 NOTIFYICONDATA data; dr })-R  
 data.cbSize=sizeof(NOTIFYICONDATA); $']VQ4tZ  
 CString tip; 40K2uT{cq  
 tip.LoadString(IDS_ICONTIP); <NB41/  
 data.hIcon=GetIcon(0); xmH-!Da  
 data.hWnd=GetSafeHwnd(); \G;CQV#{9  
 strcpy(data.szTip,tip); @@} `hii  
 data.uCallbackMessage=IDM_SHELL; zvf3b!}  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [7W(NeMk  
 data.uID=98; \&q=@rJp(z  
 Shell_NotifyIcon(NIM_ADD,&data); _CdROo6I  
 ShowWindow(SW_HIDE); {}\CL#~y  
 bTray=TRUE; GLh]G(  
} D1X{:#|  
^M Ey,  
void CCaptureDlg::DeleteIcon() BaL]mIx  
{ v>-Y uS  
 NOTIFYICONDATA data; F?4Sz#  
 data.cbSize=sizeof(NOTIFYICONDATA); 3Gd0E;3sk~  
 data.hWnd=GetSafeHwnd(); I@./${o  
 data.uID=98; >XE`h 9  
 Shell_NotifyIcon(NIM_DELETE,&data); BGqa-d  
 ShowWindow(SW_SHOW); CC8k&u,  
 SetForegroundWindow(); aRwnRii  
 ShowWindow(SW_SHOWNORMAL); f7+Cz>R  
 bTray=FALSE; r!K|E95oj9  
} ./w{L"E  
R6@uM<  
void CCaptureDlg::OnChange() ^:DyT@hQB5  
{ N@1p]\  
 RegisterHotkey(); SrZ50Se  
} o'Y#H r)/  
A1_ J sS  
BOOL CCaptureDlg::RegisterHotkey() PqEAqP  
{ 'ZnIRE,N  
 UpdateData(); mJMq{6;  
 UCHAR mask=0; 0I zZKRw  
 UCHAR key=0; l$XA5#k  
 if(m_bControl) hC>wFC  
  mask|=4; {;k_!v{  
 if(m_bAlt) (cs~@  
  mask|=2; K`4GU[ul  
 if(m_bShift) X8CVY0<o  
  mask|=1; h4 vm{ho  
  key=Key_Table[m_Key.GetCurSel()]; dVGbe07  
 if(bRegistered){ #nEL~&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \A(5;ZnuD  
  bRegistered=FALSE; #x~_`>mDN  
 }  _^T}_  
 cMask=mask; yGEb7I$h  
 cKey=key; 9X]f[^  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Q!$IQJ]|Y  
 return bRegistered; D'L{wm  
}  ;Qa;@  
detLjlE  
  四、小结 &O tAAE  
t)I0lnbs  
  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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