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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: ?B&@  
  .skR4f,h  
  一、实现方法 l^F%fIRp)  
8-wW?YTG  
  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: y8{PAH8S  
3>`CZ]ip}  
#pragma data_seg("shareddata") 2|1s!Q  
HHOOK hHook =NULL; //钩子句柄 Y\qiYra  
UINT nHookCount =0; //挂接的程序数目 *$KUnd-T  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4rh*&'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 `y2 6OYo  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey DM-8azq $  
static int KeyCount =0; L-LN+6r (#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 n tfwR#j  
#pragma data_seg() Vo\RtM/6{  
XQ{G)  
  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。 P`^{dH $P  
4RH'GnLa  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: eDm~B (G$  
Z(8'ki  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR G*;}6 bj|?  
cKey,UCHAR cMask) f|*vWHSM  
{ CTbz?Kn  
 BOOL bAdded=FALSE; ? Q`Sx  
 for(int index=0;index<MAX_KEY;index++){ 4)BPrWea1  
  if(hCallWnd[index]==0){ Y]5\%JR  
   hCallWnd[index]=hWnd; jDp]}d|f)  
   HotKey[index]=cKey; J#0oL_xY#  
   HotKeyMask[index]=cMask; Q/%(&4>'y  
   bAdded=TRUE; EzDj,!!<w  
   KeyCount++; `J>76WN  
   break; lD8&*5tDmP  
  } 5PJB<M_m:  
 } &?@gUk74"  
 return bAdded; XcS 8{  
} PC_#kz  
//删除热键 y1JxAj  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $>3/6(bW  
{ #nE%.k|R~  
 BOOL bRemoved=FALSE; 9q2 >_Mv  
 for(int index=0;index<MAX_KEY;index++){ UH<nc;.B  
  if(hCallWnd[index]==hWnd){ Q}J'S5%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Sd3KY9,  
    hCallWnd[index]=NULL; &AMW?vO  
    HotKey[index]=0; u#8J`%g  
    HotKeyMask[index]=0; b"ypS7 _  
    bRemoved=TRUE; n.{+\M6k  
    KeyCount--; u7=jtB   
    break; VK*2`Z1  
   } D<rO:Er?*a  
  } VWlOMqL995  
 } U8Pnt|0M  
 return bRemoved; R;P>_ei(LK  
} <"uT=]wZ=  
o@`& h} $  
[mSK!Y@u  
  DLL中的钩子函数如下: ^KU:5Bn  
FQR{w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >-Qg4%m  
{ o |7]8K=  
 BOOL bProcessed=FALSE; ^N!l$&=  
 if(HC_ACTION==nCode) }LH>0v_<Y  
 { 74c1i  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 D!. r$i)  
   switch(wParam)  W t&tu2  
   {  A2o ;YyF  
    case VK_MENU: JM#jg-z,~  
     MaskBits&=~ALTBIT; d9XX^nY.  
     break; =a`l1zn8=  
    case VK_CONTROL: g8yWFqE!T  
     MaskBits&=~CTRLBIT; +e0]Y8J{  
     break; !*:Zcg?7n  
    case VK_SHIFT: Hp_3BulS<  
     MaskBits&=~SHIFTBIT; ,`/J1(\ nd  
     break; O[3AI^2  
    default: //judge the key and send message 27-<q5q  
     break; um@RaU  
   } zaX!f ~;"  
   for(int index=0;index<MAX_KEY;index++){ *f~X wy"  
    if(hCallWnd[index]==NULL) /;M0tP  
     continue; ^;3z9}9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H( `^1  
    { //G5lW/*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); XelY?Ph,,  
     bProcessed=TRUE; -{>Nrx|  
    } U9;C#9E  
   } 5|ih>?C/(  
  } (Al.hEs'  
  else if((lParam&0xc000ffff)==1){ //有键按下 Q{Gi**<  
   switch(wParam) #,O<E@E  
   { ;T}#-`O_Im  
    case VK_MENU: k--.g(T  
     MaskBits|=ALTBIT; 0px@3/  
     break; `zHtfox!  
    case VK_CONTROL: eR(PY{  
     MaskBits|=CTRLBIT; Urhh)i  
     break; =5EG}@  
    case VK_SHIFT: Ga-AhP  
     MaskBits|=SHIFTBIT; "Hmo`EB0  
     break; 9YMUvd,u  
    default: //judge the key and send message J{=by]-rD,  
     break; --0z"`@{  
   } t_ &FK A  
   for(int index=0;index<MAX_KEY;index++){ US+PI`  
    if(hCallWnd[index]==NULL) @3bQ2jn   
     continue; ?lzg )88I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n 5NkjhP~Z  
    { )< ~1AL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); OGNjn9av  
     bProcessed=TRUE; Vtm5&-  
    } :N#gNtC)b  
   } KIdlndGs  
  } }io9Hk>|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 >R/^|hnJ  
   for(int index=0;index<MAX_KEY;index++){ ARW|wXhyf  
    if(hCallWnd[index]==NULL) -^8gZk/(W  
     continue; 0fnd9`N!0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  OvU]|4h  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {4&G\2<^^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 @B$ Y`eK\  
   } E7+ y W  
  }  *5 FSq  
 } pB{QO4q n  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z2og&|uT  
} h2+vl@X  
q>w@W:tZ  
  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: >`8r52  
s4lkhoN\t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :L`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KYVB=14  
DY?`Y%"  
  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: q@P5c  
#KZ- "$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Wx~ 0_P  
{ uk_?2?>-5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) \`r5tQr  
 { BCF- lrZ&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 gNl@T  
  SaveBmp(); gOa'o<  
  return FALSE; PdJtJqA8h\  
 } }:YS$'by  
 …… //其它处理及默认处理 JP9eNc[  
} Os9xZ  
h<i.@&  
TPp%II'*  
  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。 L #p-AK  
c]F$$BT  
  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。 r ,|T@|{  
oddS~lW  
  二、编程步骤 ofl3G {u  
{hK$6bD3^  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; :*#AJV)  
2|(J<H  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; GDP@M)~6*  
1=O Xi!G  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; _S/bwPj|~y  
"ji4x y  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; E=GCq=Uw  
JAen= %2b  
  5、 添加代码,编译运行程序。 W'rft@J$  
wH~Q4)#=o  
三、程序代码 ]q7\  
or\ 2)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL $I~=t{;"XV  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Lp20{R  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~R7rIP8Wr  
#if _MSC_VER > 1000 Lie\3W  
#pragma once <WtX> \]l(  
#endif // _MSC_VER > 1000 cnC&=6=a<  
#ifndef __AFXWIN_H__ iN5~@8jAzz  
#error include 'stdafx.h' before including this file for PCH eI8^T?  
#endif H:4r6-{  
#include "resource.h" // main symbols 4VSIE"8e  
class CHookApp : public CWinApp 3D +>NB  
{ 6T&6N0y+9  
 public: s#?Y^bgH  
  CHookApp(); #Qc[W +%  
  // Overrides f8_5.vlw  
  // ClassWizard generated virtual function overrides YMad]_XOP  
  //{{AFX_VIRTUAL(CHookApp) )!hDF9O  
 public: d4/snvq  
  virtual BOOL InitInstance(); yC4JYF]JN  
  virtual int ExitInstance(); 3>yb$ZU"-  
  //}}AFX_VIRTUAL )-#%  
  //{{AFX_MSG(CHookApp) Yn[y9;I{  
  // NOTE - the ClassWizard will add and remove member functions here. 8263  
  // DO NOT EDIT what you see in these blocks of generated code ! A!H6$-W|p  
  //}}AFX_MSG KWCA9.w4q  
  DECLARE_MESSAGE_MAP() i0Qg[%{9#  
}; I<z /Y?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); v-Ggf0RF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \06fP4?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }3j/%oN.(  
BOOL InitHotkey(); ]IXKoJUf  
BOOL UnInit(); ' wvZnb  
#endif 1wuLw Ad  
1C^6'9o  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Qr1%"^4  
#include "stdafx.h" ny'~pT'00  
#include "hook.h" .@JXV $Z  
#include <windowsx.h> Yq4_ss'nB  
#ifdef _DEBUG kM*f9x  
#define new DEBUG_NEW ,'m<um  
#undef THIS_FILE ,* ?bET $  
static char THIS_FILE[] = __FILE__; k]`I 3>/L  
#endif Sb>;k(;`:  
#define MAX_KEY 100 LR]P?  
#define CTRLBIT 0x04 /@lXQM9 T  
#define ALTBIT 0x02 ]zmY] 5  
#define SHIFTBIT 0x01 G#@o6r  
#pragma data_seg("shareddata") v)!Rir5  
HHOOK hHook =NULL; nORm7sa9  
UINT nHookCount =0; XB UO  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  r75,mX  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT {6~v oVkj  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey C^K?"800  
static int KeyCount =0; Q?L-6]pg  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Tf Q(f?  
#pragma data_seg() 25t2tj@S  
HINSTANCE hins; sKB])mf]  
void VerifyWindow(); |L.QIr,jCC  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `Q<hL{AH  
//{{AFX_MSG_MAP(CHookApp) iE':ur<`  
// NOTE - the ClassWizard will add and remove mapping macros here. )}9Ef"v|  
// DO NOT EDIT what you see in these blocks of generated code! ^, q\S  
//}}AFX_MSG_MAP L 9Z:>i?  
END_MESSAGE_MAP() L qMH]W  
]MfT5#(6h  
CHookApp::CHookApp() PZKKbg2 S  
{ ox{)O/aj  
 // TODO: add construction code here, H5S>|"`e`e  
 // Place all significant initialization in InitInstance Q*ZqY  
} {1'XS,2  
iyc}a6g  
CHookApp theApp; qm4 Ejc<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;yqJEj_m(  
{ ce.'STm=  
 BOOL bProcessed=FALSE; (\e,,C%;  
 if(HC_ACTION==nCode) W=&\d`><k  
 { HtgVD~[]  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8TD:~ee  
   switch(wParam)  ;iy]mPd  
   { `8\ _ ]w0  
    case VK_MENU: /P<RYA~  
     MaskBits&=~ALTBIT; %L=ro qz  
     break; _' Xt  
    case VK_CONTROL: R4 ;^R  
     MaskBits&=~CTRLBIT; ]BP"$rs  
     break; F]N9ZWn /  
    case VK_SHIFT: >#Y8#-$zc  
     MaskBits&=~SHIFTBIT; $fPf/yQmC  
     break; vY7C!O/y_k  
    default: //judge the key and send message .wtb7U;7  
     break; #yFDC@gH1  
   } i d\0yRBt  
   for(int index=0;index<MAX_KEY;index++){ 5O#CdN-S  
    if(hCallWnd[index]==NULL) 2.p7fu  
     continue; =Jg5J5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h2`W~g_  
    { yP :>vFd7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~!E% GCyFy  
     bProcessed=TRUE; 6c^2Nl8e  
    } QY8I_VF  
   } &q#$SU,$(  
  } sHm|&  
  else if((lParam&0xc000ffff)==1){ //Key down *P5Xy@:  
   switch(wParam) %E3|b6k\  
   { <,(6*b  
    case VK_MENU: X<Rh-1$8F  
     MaskBits|=ALTBIT; 4};iL)  
     break;  4C/  
    case VK_CONTROL: 1u:OzyJy  
     MaskBits|=CTRLBIT; # 5v 2`|)  
     break; >(ku*  
    case VK_SHIFT: T?N' k=   
     MaskBits|=SHIFTBIT; "(F>?pq  
     break; 8wp)aGTcU  
    default: //judge the key and send message /i"vEI  
     break; mhH[jO)  
   } F2:+i#lE  
   for(int index=0;index<MAX_KEY;index++) ;El"dqH   
   { M}!7/8HUC  
    if(hCallWnd[index]==NULL) ;26a8g(  
     continue; O(!J^J3_z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 36,qh.LKn  
    { Qf6]qJa|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2P`hdg  
     bProcessed=TRUE; N8m|Y]^H#  
    } 12gcma}  
   } PPU,o8E+  
  } kG[u$[B  
  if(!bProcessed){ yBXdj`bV  
   for(int index=0;index<MAX_KEY;index++){ ^:5 ;H=.  
    if(hCallWnd[index]==NULL) %a<N[H3NV@  
     continue; SouPk/-B80  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @aN<nd`q)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n7i;^=9 mM  
   } IFlDw}M!9  
  } 3o9`Ko0  
 } / *Z( ;-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); T3u%V_  
} }\|$8~  
Lfx&DK !  
BOOL InitHotkey() qXR>Z=K<  
{ 5rRYv~+  
 if(hHook!=NULL){ Tm-Nz7U^^  
  nHookCount++; UpL?6)  
  return TRUE; k {_X%H/  
 } R!0O[i  
 else Qv(}*iq]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 0V`s 3,k  
  if(hHook!=NULL) +e);lS"+/  
   nHookCount++; Q@6OIE  
  return (hHook!=NULL); G4{ zt3{  
} zGHP{a1O7  
BOOL UnInit() j!B+Q  
{ ;g?oU "YM  
 if(nHookCount>1){ JOS,>;;F4  
  nHookCount--; |GM?4'2M.  
  return TRUE; F<Js"z+  
 } cW4:eh  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 0(VAmb%{  
 if(unhooked==TRUE){ GKu@8Ol-wu  
  nHookCount=0; &Ey5 H?U!  
  hHook=NULL; -'QvUHL|  
 } Ac 0C,*|^  
 return unhooked; mw!D|  
} $YSAD\a<  
)WF]v"t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r" d/ 9  
{ [wWip1OR  
 BOOL bAdded=FALSE; P95U{   
 for(int index=0;index<MAX_KEY;index++){ 2>Hl=bX  
  if(hCallWnd[index]==0){ =hxj B*")  
   hCallWnd[index]=hWnd; ;XNe:g.CR  
   HotKey[index]=cKey; +[:"$?J  
   HotKeyMask[index]=cMask; Qz2Y w `  
   bAdded=TRUE; !4\`g?  
   KeyCount++; 4G"T{A`O  
   break; oXRmnt  
  } X|^E+ `M4  
 } ,+-l1GpL  
 return bAdded; ~UA-GWb  
} N3 .!E|  
c"Kl@ [1\~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /{vv n  
{ _W'>?e0i  
 BOOL bRemoved=FALSE; NNLZ38BV7  
 for(int index=0;index<MAX_KEY;index++){ fw$/@31AP?  
  if(hCallWnd[index]==hWnd){ B38_1X7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9\ZlRYnc=  
    hCallWnd[index]=NULL; 43-mv1>.  
    HotKey[index]=0; [* ,k  
    HotKeyMask[index]=0; = Ryh@X&  
    bRemoved=TRUE; )#n0~7 &  
    KeyCount--; O32p8AxEz  
    break; Fka&\9i  
   } !2R~/Rg  
  } Zz}Wg@&  
 } ;#$ 67G$  
 return bRemoved; R#gt~]x6k  
} DjY&)oce(  
.l5y+a'  
void VerifyWindow() .RF ijr  
{ vVB8zS~l ,  
 for(int i=0;i<MAX_KEY;i++){ Qz)1wf'y  
  if(hCallWnd!=NULL){ ]D_"tQ?i  
   if(!IsWindow(hCallWnd)){ ~R^~?Y%+<  
    hCallWnd=NULL; u`?MV2jU2  
    HotKey=0; g$ bbm}6S  
    HotKeyMask=0; "P.H  
    KeyCount--; I/4:SNha  
   } q2 K@i*s  
  } P`r@<cgb=  
 } `/?XvF\  
} |R[@u=7s  
q)0?aL  
BOOL CHookApp::InitInstance() "Kky|(EQ$$  
{ _2uRY  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6[3oOO:uo  
 hins=AfxGetInstanceHandle(); YZ>L\  
 InitHotkey(); S}L$-7Ct  
 return CWinApp::InitInstance(); U9^o"vT  
} OXu*w l(z  
c#o(y6  
int CHookApp::ExitInstance() r\nKJdh;ka  
{ `;KU^dH  
 VerifyWindow(); ueI1O/Mi  
 UnInit(); D<=x<.  
 return CWinApp::ExitInstance(); u /PaXQ  
}  l Ozi|  
;Q*=AW  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file pc9m,?n  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) } U <T>0  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ NQB a+N  
#if _MSC_VER > 1000 \l)Jb*t  
#pragma once <X>lA  
#endif // _MSC_VER > 1000 Tx+!D'>  
|#_IAN  
class CCaptureDlg : public CDialog ]x)^/ d  
{ bEO\oS  
 // Construction hd+(M[C<9  
 public: Vyy;mEBg  
  BOOL bTray; \tv^],^`  
  BOOL bRegistered; [/Q .MmnL  
  BOOL RegisterHotkey(); cD^`dn%$  
  UCHAR cKey; t2bv nh  
  UCHAR cMask; ]oOSL=~c  
  void DeleteIcon(); R#"LP7\  
  void AddIcon(); V2Iq k]V%y  
  UINT nCount; ^:krfXT  
  void SaveBmp(); >WYiOXYv  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor #eRrVjbo  
  // Dialog Data .\Z/j  
  //{{AFX_DATA(CCaptureDlg) l]g /rs  
  enum { IDD = IDD_CAPTURE_DIALOG }; +/"Ws '5E  
  CComboBox m_Key; Z<_"Tk;!',  
  BOOL m_bControl; 6YErF|  
  BOOL m_bAlt; hk5[ N=  
  BOOL m_bShift; gu1:%raXd  
  CString m_Path; I, 7~D!4G  
  CString m_Number; c:*[HO\  
  //}}AFX_DATA Bqcih$`BVU  
  // ClassWizard generated virtual function overrides ,Yp+&&p.  
  //{{AFX_VIRTUAL(CCaptureDlg) MWGs:tpL4  
 public: egXHp<bqw  
  virtual BOOL PreTranslateMessage(MSG* pMsg); g?7I7W~?`  
 protected: n'?AZ4&z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,0hk)Vvr3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :.VI*X:aQh  
  //}}AFX_VIRTUAL UO1WtQyu,H  
  // Implementation ?&gqGU}  
 protected: Q1 t-Z; X  
  HICON m_hIcon; Pv#Oea?  
  // Generated message map functions Kl\g{>{Uz  
  //{{AFX_MSG(CCaptureDlg) h0cdRi  
  virtual BOOL OnInitDialog(); &b__ /o  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); JJQS7,vG  
  afx_msg void OnPaint(); _ww>u""B~  
  afx_msg HCURSOR OnQueryDragIcon(); WX-J4ieL  
  virtual void OnCancel(); 3BZa}Q_  
  afx_msg void OnAbout(); @sr~&YhA  
  afx_msg void OnBrowse(); hR4\:s+[  
  afx_msg void OnChange(); ia9=&Hy])  
 //}}AFX_MSG K]{x0A  
 DECLARE_MESSAGE_MAP() wB(X(nr  
}; **G5fS.^W  
#endif P Nf_{4  
sBq-"YcjR  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &E?TR A# E  
#include "stdafx.h" WR.>?IG2E  
#include "Capture.h" ?~:4O}5Ax  
#include "CaptureDlg.h" R/WbcQ)  
#include <windowsx.h> w-j^jU><3  
#pragma comment(lib,"hook.lib") ^\f1zg9I  
#ifdef _DEBUG ymW? <\AD,  
#define new DEBUG_NEW zk;'`@7  
#undef THIS_FILE Nd h  
static char THIS_FILE[] = __FILE__; ]3\%i2NM  
#endif <-h[I&."  
#define IDM_SHELL WM_USER+1 Z}AhDIw!G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %MM)5MsB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Wt M1nnJp  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; u9*7Buou^  
class CAboutDlg : public CDialog |V&E q>G  
{ K%g_e*"$  
 public: 6QYHPz  
  CAboutDlg(); edL sn>\*#  
  // Dialog Data xFzaVjjP  
  //{{AFX_DATA(CAboutDlg) RI3GAd  
  enum { IDD = IDD_ABOUTBOX }; VZ]}9k  
  //}}AFX_DATA [OYSNAs *y  
  // ClassWizard generated virtual function overrides |4j'KM;U  
  //{{AFX_VIRTUAL(CAboutDlg) b:Tv Ta  
 protected: )B9/P>c  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;r BbLM`  
  //}}AFX_VIRTUAL }F';"ybrU)  
  // Implementation XE$;Z'Qhjm  
 protected: -7IRlP&  
  //{{AFX_MSG(CAboutDlg) rM`z2*7%d  
  //}}AFX_MSG FM"[:&>  
  DECLARE_MESSAGE_MAP() 8wLGmv^  
}; v[\GhVb  
T`2a)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @;X#/dZe  
{ yS.)l  
 //{{AFX_DATA_INIT(CAboutDlg) }p>l,HD  
 //}}AFX_DATA_INIT Fu>;hx]s  
} w$0*5n>)  
q\/xx`L  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .umN>/o[  
{ ge]Z5E(1  
 CDialog::DoDataExchange(pDX); s{:Thgv,9  
 //{{AFX_DATA_MAP(CAboutDlg) 6Z5$cR_vC7  
 //}}AFX_DATA_MAP ~g}blv0q+B  
} ^[VEr"X  
kvN<o-B  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ? CU;  
 //{{AFX_MSG_MAP(CAboutDlg) ^ f[^.k$3d  
 // No message handlers QN;GMX5&  
 //}}AFX_MSG_MAP m A('MS2  
END_MESSAGE_MAP() 5R6QZVc  
y]g5S-G  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $S^rKp#  
: CDialog(CCaptureDlg::IDD, pParent) DAy|'%rF1-  
{ JyePI:B&)j  
 //{{AFX_DATA_INIT(CCaptureDlg) t$PJ*F67M  
  m_bControl = FALSE; E(*S]Z[  
  m_bAlt = FALSE; F(`Q62o@  
  m_bShift = FALSE; ]} pAZd  
  m_Path = _T("c:\\"); | Pqs)Mb]  
  m_Number = _T("0 picture captured."); m4^VlE,`Dh  
  nCount=0; 9hgIQl  
  bRegistered=FALSE; 9t7 e~&R  
  bTray=FALSE; y!x-R !3  
 //}}AFX_DATA_INIT X;v{,P=J  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ` (]mUW  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); P0rdGf 5T  
} 2<*Yq 8  
qnzNJ_ `R  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) '.e 5Ku  
{ GYonb) F  
 CDialog::DoDataExchange(pDX); _k5$.f:Yj<  
 //{{AFX_DATA_MAP(CCaptureDlg) JEfhr  
  DDX_Control(pDX, IDC_KEY, m_Key);  HS|x  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); sA }X)aP  
  DDX_Check(pDX, IDC_ALT, m_bAlt); NJKk\RM@7  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1?r$Rx<R  
  DDX_Text(pDX, IDC_PATH, m_Path); =|d5V%mK  
  DDX_Text(pDX, IDC_NUMBER, m_Number);  c70B  
 //}}AFX_DATA_MAP FWo`oJeN  
} 4-\4G"4  
z]sQ3"cmX  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) x!onan  
//{{AFX_MSG_MAP(CCaptureDlg) U}{\qs-zt  
 ON_WM_SYSCOMMAND() <4;f?e u  
 ON_WM_PAINT() (; Zl  
 ON_WM_QUERYDRAGICON() :$QwOz^N*  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?#__#  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) +*RpOtss  
 ON_BN_CLICKED(ID_CHANGE, OnChange) P2)g%$ME  
//}}AFX_MSG_MAP l`];CALA4  
END_MESSAGE_MAP() 7wqD_Xr  
+7K]5p;!~  
BOOL CCaptureDlg::OnInitDialog() t;[Q&Jl  
{ B^hK  
 CDialog::OnInitDialog(); CzT_$v_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); :wJ!rn,4  
 ASSERT(IDM_ABOUTBOX < 0xF000); [92bGR{  
 CMenu* pSysMenu = GetSystemMenu(FALSE); YGLR%PYv"  
 if (pSysMenu != NULL) c:}K(yAdd  
 { g: "Hg-s  
  CString strAboutMenu; 5gPAX $jH  
  strAboutMenu.LoadString(IDS_ABOUTBOX); fVBRP[,   
  if (!strAboutMenu.IsEmpty()) &l~=c2  
  { Jaf=qwZ/`  
   pSysMenu->AppendMenu(MF_SEPARATOR); Vs[!WJ 7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %P]-wBJw  
  } O0"&wvR+5  
 } M~!LjJg;  
 SetIcon(m_hIcon, TRUE); // Set big icon .{ ]=v  
 SetIcon(m_hIcon, FALSE); // Set small icon '?!2h'  
 m_Key.SetCurSel(0); *$>$O%   
 RegisterHotkey(); ?rV c}  
 CMenu* pMenu=GetSystemMenu(FALSE); :Ee5:S   
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Bb/aeLv  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); AwL;-|X  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); FkT % -I  
 return TRUE; // return TRUE unless you set the focus to a control <kor;exeJ  
} ~ .Eln+N  
';7|H|,F  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :Zd# }P  
{ K#{E87G(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) l@YpgyqaL  
 { 'lNl><e-  
  CAboutDlg dlgAbout; P^LOrLmo8  
  dlgAbout.DoModal(); `o*g2fW!  
 } -nT+!3A8  
 else 2=NYBOE  
 { K+mtuB]yr  
  CDialog::OnSysCommand(nID, lParam); Z_Ma|V?6  
 } L=}UApK  
} XT_BiZ%l5O  
HwSPOII|8K  
void CCaptureDlg::OnPaint() I_ .;nU1xA  
{ jIc;jjAF  
 if (IsIconic()) a^5`fA/L,  
 { Lou4M  
  CPaintDC dc(this); // device context for painting y$V{yh[:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); r5iO%JFg  
  // Center icon in client rectangle {Q(6 .0R  
  int cxIcon = GetSystemMetrics(SM_CXICON); |_2ANWHz  
  int cyIcon = GetSystemMetrics(SM_CYICON); Da-(D<[0  
  CRect rect; pr0V)C6  
  GetClientRect(&rect); =3SL& :8  
  int x = (rect.Width() - cxIcon + 1) / 2; FvI`S>  
  int y = (rect.Height() - cyIcon + 1) / 2; _@prv7e  
  // Draw the icon -;`W"&`ss  
  dc.DrawIcon(x, y, m_hIcon); kdYl>M  
 } 'H cDl@E  
 else IfXLnD^||  
 { 4l`gAE$  
  CDialog::OnPaint(); }Rux<=cd|  
 } o"1us75P  
} }C&c=3V  
l*:p==  
HCURSOR CCaptureDlg::OnQueryDragIcon() t+(CAP|,  
{ S~Hj. d4/  
 return (HCURSOR) m_hIcon; [sk"2  
} ,6buo~?W:  
"DN`@  
void CCaptureDlg::OnCancel() KnFbRhu[  
{ t@HE.h  
 if(bTray) )w` Nkx  
  DeleteIcon(); ?GC0dN  
  CDialog::OnCancel(); |}|;OG  
} 8say"Qz  
5Q}@Y3 i=  
void CCaptureDlg::OnAbout() E37@BfpO3  
{ 7f$Lb,\y  
 CAboutDlg dlg; o_N02l4J)  
 dlg.DoModal(); "}EbA3  
} O&s6blD11  
%% >?<4t  
void CCaptureDlg::OnBrowse() TatyD**(  
{ ,i,=LGn  
 CString str; D/Wuan?yPN  
 BROWSEINFO bi; yW&i Uh=0  
 char name[MAX_PATH]; 4dK@UN\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); w8i!Qi#y5D  
 bi.hwndOwner=GetSafeHwnd(); <Gw<(M  
 bi.pszDisplayName=name; YC_^jRB8n  
 bi.lpszTitle="Select folder"; yi?&^nX@9,  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ?:nZv< x  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); M5V1j(URE  
 if(idl==NULL) zef,*dQY   
  return; |Q;o538  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "p{ '984r<  
 str.ReleaseBuffer(); F%d"gF0qu  
 m_Path=str;  c$|dK  
 if(str.GetAt(str.GetLength()-1)!='\\') bSghf"aN  
  m_Path+="\\"; YM|S<  
 UpdateData(FALSE); 1#<E]<='t  
} TH!8G,(w  
NLl~/smMS  
void CCaptureDlg::SaveBmp() d/>,U7eS[+  
{ sriz b  
 CDC dc; 5uer [1A  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); g8"7wf`0k  
 CBitmap bm; 2&fwr>!$  
 int Width=GetSystemMetrics(SM_CXSCREEN); F/SsiUBS  
 int Height=GetSystemMetrics(SM_CYSCREEN); RKkI/Z0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); |mmG s  
 CDC tdc; HJR<d&l;p  
 tdc.CreateCompatibleDC(&dc); QP%Fz#u`  
 CBitmap*pOld=tdc.SelectObject(&bm); #L0I+ K,K\  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :(`>bY  
 tdc.SelectObject(pOld); ~N^vE;  
 BITMAP btm; YX VJJd$U  
 bm.GetBitmap(&btm); gj,J3x4TK/  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; nln6:^w  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); zD;] sk4  
 BITMAPINFOHEADER bih; "D(8]EG=  
 bih.biBitCount=btm.bmBitsPixel; vqOLSE"t*O  
 bih.biClrImportant=0; !<zzP LC  
 bih.biClrUsed=0; oQnk+>}%  
 bih.biCompression=0; Bq]O &>\hX  
 bih.biHeight=btm.bmHeight; u^zitW!X$  
 bih.biPlanes=1; -==qMrKP  
 bih.biSize=sizeof(BITMAPINFOHEADER); KR(} A"  
 bih.biSizeImage=size; MW~B[%/  
 bih.biWidth=btm.bmWidth; N"RYM~c7  
 bih.biXPelsPerMeter=0; iv+jv2ZF%  
 bih.biYPelsPerMeter=0; Jx$#GUl#j  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); kdh9ftm*\  
 static int filecount=0; `F\:XuY   
 CString name; <-:@} |br  
 name.Format("pict%04d.bmp",filecount++); LDEW00zL  
 name=m_Path+name; #7-@k-<|  
 BITMAPFILEHEADER bfh; h<1dTl*  
 bfh.bfReserved1=bfh.bfReserved2=0; NS4'IR=;E!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); T#G<?oF  
 bfh.bfSize=54+size; rk,1am:cg  
 bfh.bfOffBits=54; PT#eXS9_  
 CFile bf; 3U"')  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %y\eBfW,/  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); qD;v/,?  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :~3{oZGX&  
  bf.WriteHuge(lpData,size); 04guud }  
  bf.Close(); ).}k6v[4)  
  nCount++; L;M^>{>  
 } gJ5wAK+?  
 GlobalFreePtr(lpData); |@ZqwC=  
 if(nCount==1) *e3L4 7"G  
  m_Number.Format("%d picture captured.",nCount); 5Z6-R}uXk  
 else #W@% K9  
  m_Number.Format("%d pictures captured.",nCount); ;eW'}&|LV  
  UpdateData(FALSE); Z-t}6c'Kg  
} 60,-\h  
Q5y q"/=[a  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 2rO)qjiH  
{ Z?(4%U5z  
 if(pMsg -> message == WM_KEYDOWN) L)/6kt=  
 { GL 5^_`n  
  if(pMsg -> wParam == VK_ESCAPE) q)?p$\  
   return TRUE; A3"1D  
  if(pMsg -> wParam == VK_RETURN) 0n*rs=\VG  
   return TRUE; 'G l;Ir^  
 } y)p$_.YFF  
 return CDialog::PreTranslateMessage(pMsg); ?..i4  
} ]M~8 @K  
3V/_I<y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gp$EXJ=  
{ a: yB%:2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 8B*E+f0  
  SaveBmp(); K5!";V  
  return FALSE; emv;m/&8  
}  /[Bl  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ NWJcFj_  
 CMenu pop; Nt zq"ces)  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &;ZC<?wS  
 CMenu*pMenu=pop.GetSubMenu(0); O1?B{F/ e  
 pMenu->SetDefaultItem(ID_EXITICON); 1UW s_|X!  
 CPoint pt; TRgY:R_  
 GetCursorPos(&pt); iN<(O7B;  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); #D`S  
 if(id==ID_EXITICON) Mx/h?}u;  
  DeleteIcon(); S}.\v<  
 else if(id==ID_EXIT) >oft :7p  
  OnCancel(); Cq?',QU6j  
 return FALSE; +P [88!  
} 3TU'*w &  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); hz< |W5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) rD0k%-{{  
 AddIcon(); x1N me%%&  
 return res; kF+ZW%6N  
} <TI3@9\qXE  
'1CD- Bu  
void CCaptureDlg::AddIcon() tCZpfZ@+=  
{ =QrA0kQR  
 NOTIFYICONDATA data; pNp^q/- yB  
 data.cbSize=sizeof(NOTIFYICONDATA); cJP'ShnCh  
 CString tip; yDd=& T   
 tip.LoadString(IDS_ICONTIP); Sdgb#?MR|  
 data.hIcon=GetIcon(0); X,>(Y8  
 data.hWnd=GetSafeHwnd(); 5{')GTdX>  
 strcpy(data.szTip,tip); &bB6}H(  
 data.uCallbackMessage=IDM_SHELL; UUl*f!& o  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; G3H#XK D  
 data.uID=98; 1 h<fJzh  
 Shell_NotifyIcon(NIM_ADD,&data); Dp!;7e s|  
 ShowWindow(SW_HIDE); nc<qbN  
 bTray=TRUE; q z=yMIy=  
} (tJ91SBl  
/r-8T>m  
void CCaptureDlg::DeleteIcon() [FB&4>V/  
{ 6/|U  
 NOTIFYICONDATA data; r k@UsHy  
 data.cbSize=sizeof(NOTIFYICONDATA); }W1^t  
 data.hWnd=GetSafeHwnd(); (Ar?QwP9>  
 data.uID=98; ab{;Z 5O  
 Shell_NotifyIcon(NIM_DELETE,&data); f](I.lm:  
 ShowWindow(SW_SHOW); gC0;2  
 SetForegroundWindow(); +q7qK*  
 ShowWindow(SW_SHOWNORMAL); !2(.$}E  
 bTray=FALSE; bpGzTU  
} pXssh  
AQ-mE9>P  
void CCaptureDlg::OnChange() 60'6/3  
{ Pow|:Lau!  
 RegisterHotkey(); 0X.TF  
} NNgK:YibD  
{-Yee[d<?  
BOOL CCaptureDlg::RegisterHotkey() ` %uK0qw"  
{ C}9Kx }q  
 UpdateData(); 'X54dXS?l  
 UCHAR mask=0; ,pn ) >  
 UCHAR key=0; O"qR}W  
 if(m_bControl) #aa1<-&H  
  mask|=4; =m~ruZ/  
 if(m_bAlt) M=W 4:H,gx  
  mask|=2; XYts8}y5  
 if(m_bShift) :xM}gPj"  
  mask|=1; A9t8`|1"%H  
  key=Key_Table[m_Key.GetCurSel()]; p(.N(c  
 if(bRegistered){ oQ{cSThj  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ":V%(c  
  bRegistered=FALSE; Jns/v6  
 } B7|c`7x(  
 cMask=mask; >zFD $  
 cKey=key; Y!M~#oqio  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 6i| ~7md,  
 return bRegistered; w?_`/oqd|  
} :b5XKv^  
T RDxT  
  四、小结 2Q}7fht  
YIO.yN"0  
  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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