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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: 3uvl'1(%J  
  /'v!{m  
  一、实现方法 s!Id55R]  
3!?QQT,!)  
  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: rTC|8e  
P4MP`A  
#pragma data_seg("shareddata") 6QPbmO]z  
HHOOK hHook =NULL; //钩子句柄 )OlYz!#?  
UINT nHookCount =0; //挂接的程序数目 KJ-Q$ M  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 'r^'wv]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 %74f6\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey N'5DB[:c:  
static int KeyCount =0; RzB64  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 *:l$ud  
#pragma data_seg() @6U&7!  
u7p:6W  
  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。 2<2a3'pG  
(Zy=e?E,  
  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: hL;??h,!_  
1mEW]z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR O1]XoUH<  
cKey,UCHAR cMask) 9 771D  
{ aO<H!hK  
 BOOL bAdded=FALSE; cwUor}<|  
 for(int index=0;index<MAX_KEY;index++){ !VfVpi+-  
  if(hCallWnd[index]==0){ )pey7-P7g5  
   hCallWnd[index]=hWnd; FQJFq6l  
   HotKey[index]=cKey; 2NL|_W/  
   HotKeyMask[index]=cMask; ;ov}%t>UD  
   bAdded=TRUE; pAEJ=Te  
   KeyCount++; ~3Z(0 gujD  
   break; Xn<|6u  
  } D{t0OvQag  
 } h!hv{c  
 return bAdded; +hT9V1'-D  
} A_6Dol=J@  
//删除热键  q,'~=Y5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D>wo>,G  
{ .B$3y#TOb  
 BOOL bRemoved=FALSE; Ujly\ix`  
 for(int index=0;index<MAX_KEY;index++){ %N<>3c<8P  
  if(hCallWnd[index]==hWnd){ C|ou7g4'p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \ItAc2,Fl  
    hCallWnd[index]=NULL; ~1{~iB2G  
    HotKey[index]=0;  ~#z b  
    HotKeyMask[index]=0; 0`WZ  
    bRemoved=TRUE; Y7yzM1?t  
    KeyCount--; @qsOWx`l$  
    break;  hP 1;$  
   } C4C!-12  
  } pq5bK0N Q  
 } JDMsco+j5  
 return bRemoved; l)0yv2[h  
} c$3ZEe  
lU3Xd_v O  
%x$mAOUv  
  DLL中的钩子函数如下: 0I.!  
'V Y\ut  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )4/UzR$  
{ ,!^w  
 BOOL bProcessed=FALSE; [  **F  
 if(HC_ACTION==nCode) %{P." ki  
 { w?p8)Q6m  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 OoAZ t  
   switch(wParam) gkv,Om  
   {  _ID =]NJ_  
    case VK_MENU: /^Lo@672  
     MaskBits&=~ALTBIT; 'nqVcNgb  
     break; M$LzV}k  
    case VK_CONTROL: O`(it %Ho!  
     MaskBits&=~CTRLBIT; Vg"Ze[dA  
     break; }Qvoms<k  
    case VK_SHIFT: 7otqGE\2  
     MaskBits&=~SHIFTBIT; 9\NP)Vm$^  
     break; P~*v}A  
    default: //judge the key and send message M7IQJFra  
     break; QmB,~x{j>  
   } 27jZ~Bp$  
   for(int index=0;index<MAX_KEY;index++){ GEf[k OQ  
    if(hCallWnd[index]==NULL) evGUSol?:n  
     continue; kPZ1OSX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2$%0~Z5  
    { S{ !m})1?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?GGh )";y  
     bProcessed=TRUE; =E%<"FB  
    } &($Zs'X  
   } pDx}~IB  
  } TMQu'<?V  
  else if((lParam&0xc000ffff)==1){ //有键按下 GB_ m&t  
   switch(wParam) Pi|oO-M  
   { }GTy{Y*&  
    case VK_MENU: Y_Lsmq2!  
     MaskBits|=ALTBIT; 6ypqnOTr  
     break; Y:="vWWG  
    case VK_CONTROL: 4) nQBFX  
     MaskBits|=CTRLBIT; P1l@K2r  
     break; 8m"5J-uIi  
    case VK_SHIFT: \ow0Y >  
     MaskBits|=SHIFTBIT; Kq0hT4w  
     break; R OQIw  
    default: //judge the key and send message 9qQFIw~S  
     break; JZ=a3)x"  
   } oYN# T=Xi  
   for(int index=0;index<MAX_KEY;index++){ ,Pd2ZfZ  
    if(hCallWnd[index]==NULL) $bKa"T*  
     continue; Fw5r\J87c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) K\ \U F  
    { [0e]zyB+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]H|1q uT  
     bProcessed=TRUE; .*g;2.-qv&  
    } br'/>Un"  
   } ;3_Q7;y  
  } <!|2Ru  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 @*O(dw  
   for(int index=0;index<MAX_KEY;index++){ uL4@e  
    if(hCallWnd[index]==NULL) 4.dMNqU  
     continue; jWW2&cBm\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) p8^^Pva/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); KXFa<^\o  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !<2*B^   
   } ':w6 {b  
  } 2h6F j&  
 } hTn }AsfLY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); g `B?bBg  
} #z t+U^#)  
vP'R7r2Yx  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 3-8Vw$u  
{UYqRfgbZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uyG4zV\h*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $P@P}%2  
t5N4d  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: |R*fw(=W  
_H8)O2mJ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) aV(*BE/@F  
{ lv ^=g  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) I/)dXk~  
 { /HDX[R   
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 pp[? k}@  
  SaveBmp();  m|"MJP  
  return FALSE; *qBMt[a  
 } Qzh:*O  
 …… //其它处理及默认处理 R/O_*XY  
} 1ck2Gxn  
W^+b gg<.  
=8dCk\/  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 R4JO)<'K&  
nhCB ])u8l  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 }u+R,@l/  
e:V,>RbC0s  
  二、编程步骤 ]@?3,N  
tXK hkt`  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; y9)l,@D  
Qw5M\   
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; C.(ZXU7  
`?6m0|\@  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; L6A6|+H%E  
sq)Nn&5A  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; sX_^H%fd  
!P92e1  
  5、 添加代码,编译运行程序。 Cm ;N5i  
iy: ;g  
三、程序代码 Y9w= [[1  
m&A/IW,.  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL |k+&we uY  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) T8hQ< \g  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ BkqIfV%O  
#if _MSC_VER > 1000 E>6zwp  
#pragma once 4 |5ekwk  
#endif // _MSC_VER > 1000 |_=jXf\TL  
#ifndef __AFXWIN_H__ w6 "LHy[  
#error include 'stdafx.h' before including this file for PCH !s)$_tG  
#endif 329xo03-[  
#include "resource.h" // main symbols WAdl@){  
class CHookApp : public CWinApp :6M0`V;L  
{ {G{@bUG]p  
 public: @i)tQd!s  
  CHookApp(); P|(J]/  
  // Overrides DU7Ki6  
  // ClassWizard generated virtual function overrides .D>lv_kp  
  //{{AFX_VIRTUAL(CHookApp) 'FUPv61()  
 public: =k/n  
  virtual BOOL InitInstance(); M K[spV  
  virtual int ExitInstance(); =0]Mc$Ih  
  //}}AFX_VIRTUAL [ $"iO#oO  
  //{{AFX_MSG(CHookApp) /w!' [  
  // NOTE - the ClassWizard will add and remove member functions here. O@=mN*<gg0  
  // DO NOT EDIT what you see in these blocks of generated code ! R\Q%_~1  
  //}}AFX_MSG I] "$h]T  
  DECLARE_MESSAGE_MAP() G#*!)#M <  
}; c3pt?C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); TwhK>HN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8\V-aow  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R$3JbR.  
BOOL InitHotkey(); p.}[!!m P  
BOOL UnInit(); p4AXQuOP  
#endif e-K8K+7  
q-3KF  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. <|`@K| N  
#include "stdafx.h" RYhdf  
#include "hook.h" Em]T.'y  
#include <windowsx.h> !KlSw,&=.6  
#ifdef _DEBUG x> q3w# B  
#define new DEBUG_NEW `k\1vum  
#undef THIS_FILE mcXakWmi  
static char THIS_FILE[] = __FILE__; 'OihA^e  
#endif V_1#7  
#define MAX_KEY 100 RtW5U8  
#define CTRLBIT 0x04 .>nd@oU  
#define ALTBIT 0x02 $tKATL*  
#define SHIFTBIT 0x01 LK%B6-;~-  
#pragma data_seg("shareddata") =Ffq =<  
HHOOK hHook =NULL; G_<[sMC8  
UINT nHookCount =0; ~^C7(g )  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey g`6wj|@ =W  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  =*Yc/  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey G7202(w <  
static int KeyCount =0; SWGa%6|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift j`GbI0,bT  
#pragma data_seg() ,6bMf z  
HINSTANCE hins; JS:lysu  
void VerifyWindow(); D7(t6C=FP  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) xq)/QR  
//{{AFX_MSG_MAP(CHookApp) _NZHrN  
// NOTE - the ClassWizard will add and remove mapping macros here. :58'U|  
// DO NOT EDIT what you see in these blocks of generated code! ]VH@\ f  
//}}AFX_MSG_MAP WuQYEbap  
END_MESSAGE_MAP() 8{l=`y"nB  
.0-m=3mp2  
CHookApp::CHookApp() ykeUS zz2  
{ Y_B 4s-  
 // TODO: add construction code here, iL gt_@g  
 // Place all significant initialization in InitInstance :&-}S>pC  
} :Ir:OD# o  
.:raeDrd  
CHookApp theApp; IjRmpVcwN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) M^f1D&A  
{ S3w?Zk3hO  
 BOOL bProcessed=FALSE; C4uR5U  
 if(HC_ACTION==nCode) U:|v(U$"?  
 { zLqp@\sT  
  if((lParam&0xc0000000)==0xc0000000){// Key up bLzuaNa'  
   switch(wParam) }"x*xN  
   { y m{/0&7  
    case VK_MENU: ~b[4'm@  
     MaskBits&=~ALTBIT; @(?4g-*E  
     break; T6r~OV5  
    case VK_CONTROL: ]e`_.>U  
     MaskBits&=~CTRLBIT; QX=;,tr  
     break; gWo~o]f  
    case VK_SHIFT: R"o,m  
     MaskBits&=~SHIFTBIT; NXNon*"  
     break; b . j^US^  
    default: //judge the key and send message mlWIq]J  
     break; @/(7kh +  
   } 7qz-RF#s8  
   for(int index=0;index<MAX_KEY;index++){ N8q Z{CWn  
    if(hCallWnd[index]==NULL) ~?5m5z O  
     continue; Ve1] ECk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IpXhb[UZ?  
    { \KXEw2S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); z}tp0~C  
     bProcessed=TRUE; mO> M=2A  
    } @<=#i  
   } z=_{jjs  
  } PI \,`^)y  
  else if((lParam&0xc000ffff)==1){ //Key down o#) !b:/  
   switch(wParam)  BZc-  
   { <'_GQM`G  
    case VK_MENU: Lp)8SmN  
     MaskBits|=ALTBIT; D*gV S  
     break; O mIBk  
    case VK_CONTROL: B/hHkOoo  
     MaskBits|=CTRLBIT; \87J~K'  
     break; z]|[VM?4L  
    case VK_SHIFT: 9p rsL#Fn  
     MaskBits|=SHIFTBIT; y(  
     break; J\$l3i/I  
    default: //judge the key and send message X/Rx]}[   
     break; KAcri<^G  
   } 2rtP.*dd  
   for(int index=0;index<MAX_KEY;index++) PjW+V`  
   { c\{}FGC  
    if(hCallWnd[index]==NULL) C'2 =0oou  
     continue; WbWW=(N'd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) MxEAs}MDv  
    { %=8(B.I!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2\\3<  
     bProcessed=TRUE; :_a]T-GL  
    } 1 " 7#|=1/  
   } cu?(P ;mQi  
  } tB=D&L3  
  if(!bProcessed){ N pND/  
   for(int index=0;index<MAX_KEY;index++){ Sw@,<4S  
    if(hCallWnd[index]==NULL) &E riskI  
     continue; T$8~9 qx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <?{}Bo0xG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); uEGPgYY(  
   } +()t8,S,  
  } @H%=%ZwpO  
 } WTYFtZD[yH  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |kNGpwpI  
} e=z_+gVm  
x0h3jw+6  
BOOL InitHotkey() ![]I%'s  
{ )c >B23D  
 if(hHook!=NULL){ /+t[,  
  nHookCount++; &:I +]G/W  
  return TRUE; LZC?383'  
 } =&VXn{e  
 else 5 t`ap  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ^+Vk#_2Q  
  if(hHook!=NULL) YQ@6innT  
   nHookCount++; J-\?,4mcP  
  return (hHook!=NULL); RL Zf{Q>  
} lJzy)ne  
BOOL UnInit() ^%%5  
{ }`N2ZxC0AQ  
 if(nHookCount>1){ "SU-^z  
  nHookCount--; e_c;D2' F  
  return TRUE; 5J+V:Xu{  
 } }j(2Dl  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .`& /QiD  
 if(unhooked==TRUE){ {I-a;XBX  
  nHookCount=0; k gu[!hD1  
  hHook=NULL; 7 Jx-W|  
 } C{hcK 1-K  
 return unhooked; M 1^C8cz  
} "x|NG,<[9  
%L13Jsw  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l \^nC2  
{ <VaMUm<2  
 BOOL bAdded=FALSE; %|(?!w7  
 for(int index=0;index<MAX_KEY;index++){ i`KZ,   
  if(hCallWnd[index]==0){ IbJ[Og^Qyu  
   hCallWnd[index]=hWnd; 5nx<,-N*BP  
   HotKey[index]=cKey; Az< 9hk  
   HotKeyMask[index]=cMask; yD"0=\  
   bAdded=TRUE; 2>}\XKF).  
   KeyCount++; xOL)Pjo /m  
   break; 8q?;Hg  
  } fQ36Hd?(5  
 } <@e+-$  
 return bAdded; |[37:m  
} p + l_MB  
3U~lI&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J/x@$'  
{ +:,`sdv6o  
 BOOL bRemoved=FALSE; xe6_RO%  
 for(int index=0;index<MAX_KEY;index++){ %+xwk=%*  
  if(hCallWnd[index]==hWnd){ r[v-?W'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +~4bB$6*4)  
    hCallWnd[index]=NULL; R@<_Hb;Aeb  
    HotKey[index]=0; 0/:=wn^pg  
    HotKeyMask[index]=0; &oeN#5Es8C  
    bRemoved=TRUE; j|&DP-@g/  
    KeyCount--; B8UZ9I$n  
    break; 27a* H1iQ  
   } 7/|F9fF@M  
  } i2:+h}o$e  
 } )t,{YGY#  
 return bRemoved; O5^J!(.O\Z  
} iTLW<wG  
{b,2;w}95  
void VerifyWindow() MxgLzt Y  
{ MV<!<Qmj  
 for(int i=0;i<MAX_KEY;i++){ *f TG8h  
  if(hCallWnd!=NULL){ 9si}WqAw  
   if(!IsWindow(hCallWnd)){ bR'mV-2'  
    hCallWnd=NULL; w*:GM8=6  
    HotKey=0; |0L=8~M(j  
    HotKeyMask=0; e?!L}^f6X  
    KeyCount--; w#xeua|*I#  
   } 7<3U?]0  
  } z+k=|RMau  
 } ,!I?)hwOC  
} {Vxc6,=  
&"[)s[m+t  
BOOL CHookApp::InitInstance() v]:+` dV  
{ ;+i'0$;*w  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); l`b1%0y  
 hins=AfxGetInstanceHandle(); Uvh~B^6  
 InitHotkey(); 7$ =Y\ P  
 return CWinApp::InitInstance(); ~{4n}*  
} PUP"ky^q"  
qX5yN| A4  
int CHookApp::ExitInstance() ;}/U+`=D?  
{ 2$ |]Vj*Zs  
 VerifyWindow(); j2 }  
 UnInit(); H|;*_  
 return CWinApp::ExitInstance(); X*!Dc,0.k  
} =`Po<7D  
X(k{-|9]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file KdT[*-  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) DH:GI1Yu>I  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ GIm " )}W  
#if _MSC_VER > 1000 i<T P:  
#pragma once pWs\.::B  
#endif // _MSC_VER > 1000 +Qh[sGDdY  
](W5.a,-$L  
class CCaptureDlg : public CDialog D XV@DQ  
{ <nWKR,  
 // Construction , 3X: )  
 public: ?;|@T ty%  
  BOOL bTray; b!0DH[XKV  
  BOOL bRegistered; =&A!C"qK4[  
  BOOL RegisterHotkey(); :)#hrFp  
  UCHAR cKey; weAn&h|  
  UCHAR cMask; u8YB)kG  
  void DeleteIcon(); <S1??  
  void AddIcon(); -<qxO  
  UINT nCount; T[;; 9z  
  void SaveBmp(); 1 -ZJT  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }zFf0.82  
  // Dialog Data Y[Q @WdE9  
  //{{AFX_DATA(CCaptureDlg) T><{ze  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7}be>(  
  CComboBox m_Key; Y1{B c<tC  
  BOOL m_bControl; nPcS3!7B#  
  BOOL m_bAlt; 6HoqEku/Q  
  BOOL m_bShift; 01udlW.  
  CString m_Path; ^0^( u  
  CString m_Number; ha*X6R  
  //}}AFX_DATA #s"851e  
  // ClassWizard generated virtual function overrides o=pt_!i/  
  //{{AFX_VIRTUAL(CCaptureDlg) =/FF1jQ  
 public: xS'zZ%?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /XcDYMKgh  
 protected: *5'.!g('  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NYBe"/}GS  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )kYOHS  
  //}}AFX_VIRTUAL `} =yG_!A  
  // Implementation OL3UgepF  
 protected: ?O??cjiA@  
  HICON m_hIcon; -G9|n#zCU  
  // Generated message map functions BQ#3QL't  
  //{{AFX_MSG(CCaptureDlg) eNRs&^  
  virtual BOOL OnInitDialog(); !X|k"km"  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); mwh{"FL(  
  afx_msg void OnPaint(); oid[syPB  
  afx_msg HCURSOR OnQueryDragIcon(); $;2)s} ci  
  virtual void OnCancel(); 845 W>B  
  afx_msg void OnAbout(); '-vE%U@<  
  afx_msg void OnBrowse(); .WvlaPK  
  afx_msg void OnChange(); fXO_g  
 //}}AFX_MSG .NJ|p=fy  
 DECLARE_MESSAGE_MAP() 9Bz0MUbrLl  
}; +\0T\;-Xe  
#endif OL'P]=U  
\fZiL!E^7  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $Pxb1E  
#include "stdafx.h" d?A}qA[(  
#include "Capture.h" -v+&pG?m  
#include "CaptureDlg.h" B5ea(j  
#include <windowsx.h> q$[n`w-  
#pragma comment(lib,"hook.lib") ebC)H  
#ifdef _DEBUG KOey8tB)1  
#define new DEBUG_NEW XphE loL  
#undef THIS_FILE !:WW  
static char THIS_FILE[] = __FILE__; [4*1}}gW%5  
#endif BOvF)4`  
#define IDM_SHELL WM_USER+1 )%mg(O8uL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g5+7p@'fV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S]^`woD  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; { p;shs5  
class CAboutDlg : public CDialog  ?CP2AK  
{ NjX[;e-u  
 public: 2Il8f  
  CAboutDlg(); AF}gSNX  
  // Dialog Data i?>tgmu.  
  //{{AFX_DATA(CAboutDlg) 0:"2MSf>  
  enum { IDD = IDD_ABOUTBOX }; mdW~~-@H  
  //}}AFX_DATA [:h5}  
  // ClassWizard generated virtual function overrides ;HNq>/{  
  //{{AFX_VIRTUAL(CAboutDlg) <8!  Tq  
 protected: $7Z)Yp&T  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5.vG^T0w  
  //}}AFX_VIRTUAL `&!k!FZY*  
  // Implementation T%$jWndI  
 protected: ]kD"&&HV  
  //{{AFX_MSG(CAboutDlg) jV O{$j  
  //}}AFX_MSG dRW$T5dac  
  DECLARE_MESSAGE_MAP() nv0#~UgE#a  
}; l30Y8t~d  
nirDMw[  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1vnYogL   
{ , sjh^-;  
 //{{AFX_DATA_INIT(CAboutDlg) thc <xxRP  
 //}}AFX_DATA_INIT _Mk7U@j+9  
} ;),"M{"v  
Es!Q8.  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) k GHQ`h  
{ F]EBD8/b  
 CDialog::DoDataExchange(pDX); ;AX8aw,  
 //{{AFX_DATA_MAP(CAboutDlg) f>2MI4nMG  
 //}}AFX_DATA_MAP wM~H(=s`D  
} wi_'iv  
SmhGZ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) I9?Ec6a_  
 //{{AFX_MSG_MAP(CAboutDlg) _,haD)1g~  
 // No message handlers }!p`1]gem  
 //}}AFX_MSG_MAP NI aFI(  
END_MESSAGE_MAP() ;=4Xz\2  
*bd[S0l  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 3B0PGvCI1  
: CDialog(CCaptureDlg::IDD, pParent) cA)[XpQ:+W  
{ oDn|2Sdqd  
 //{{AFX_DATA_INIT(CCaptureDlg) TP%+.#Fu  
  m_bControl = FALSE; .fAv*pUzU  
  m_bAlt = FALSE; ;Hmp f0$  
  m_bShift = FALSE; L\%orLEmK  
  m_Path = _T("c:\\"); 0.Ta Xbi  
  m_Number = _T("0 picture captured."); @WMA}\Cc  
  nCount=0; k*?I>%^6#T  
  bRegistered=FALSE; 'n;OB4  
  bTray=FALSE; )G~w[~  
 //}}AFX_DATA_INIT V5i*O3a~   
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 1yQejw  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =LkR!R=  
} 'Gl&Pa1g?  
58 bCUh#uw  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) k(t}^50^j  
{ a u7.4ln>Y  
 CDialog::DoDataExchange(pDX); b2,!g }I  
 //{{AFX_DATA_MAP(CCaptureDlg) x3 >  
  DDX_Control(pDX, IDC_KEY, m_Key); /w(e  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); q_kdCO{:df  
  DDX_Check(pDX, IDC_ALT, m_bAlt); rG}\Zjn{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); k{;,6H  
  DDX_Text(pDX, IDC_PATH, m_Path); 8NBT|N~N  
  DDX_Text(pDX, IDC_NUMBER, m_Number); m3bCZ 9iE  
 //}}AFX_DATA_MAP ) ZfdQ3  
} y5r4+2B  
T 20&F  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ?W>qUrZ  
//{{AFX_MSG_MAP(CCaptureDlg) qpIC{'A.  
 ON_WM_SYSCOMMAND() ntFT>g{B  
 ON_WM_PAINT() !|ak^GE:(%  
 ON_WM_QUERYDRAGICON() 3ZEB  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) +N`ua  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 9h&R]yz;  
 ON_BN_CLICKED(ID_CHANGE, OnChange) aJ Z"D8C  
//}}AFX_MSG_MAP Gg Jf7ie4  
END_MESSAGE_MAP() +M' H0-[  
_{<seA  
BOOL CCaptureDlg::OnInitDialog() /!h;c$  
{ VTy9_~q  
 CDialog::OnInitDialog(); Xpe)PXb  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )R`xR,H  
 ASSERT(IDM_ABOUTBOX < 0xF000); [AMAa]^  
 CMenu* pSysMenu = GetSystemMenu(FALSE); I$q]. B  
 if (pSysMenu != NULL) vM:cWat  
 { a=cvCf  
  CString strAboutMenu; Ar*^ ;/  
  strAboutMenu.LoadString(IDS_ABOUTBOX); |L2SFB?d=  
  if (!strAboutMenu.IsEmpty()) ?;[w" `"  
  { wLc4Dm*V  
   pSysMenu->AppendMenu(MF_SEPARATOR); 1 zw*/dp  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *(C(tPhC  
  } wE+${B03  
 } .*m>\>Gsgw  
 SetIcon(m_hIcon, TRUE); // Set big icon J'$>Gk]  
 SetIcon(m_hIcon, FALSE); // Set small icon @)o^uU T  
 m_Key.SetCurSel(0); fU=B4V4@  
 RegisterHotkey(); Mmpfto%i  
 CMenu* pMenu=GetSystemMenu(FALSE); _XCOSomL`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); I:K"'R^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); PB;eHy  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 3k#~yaoI  
 return TRUE; // return TRUE unless you set the focus to a control ]vwW]O7  
} !*R qCS,  
DL$@?.?I  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :#@= B]  
{ 7}M2bH} \K  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) PDs@?nz,  
 { $Y69@s%f  
  CAboutDlg dlgAbout; ;)N>t\v  
  dlgAbout.DoModal(); wF((  
 } jv&*uYm  
 else '!/<P"5t  
 { KQB3 m"  
  CDialog::OnSysCommand(nID, lParam); 0c}  }Q  
 } yKO`rtP  
} +$g}4  
<HbcNE~  
void CCaptureDlg::OnPaint() ``wSc0\  
{ s"t$0cH9  
 if (IsIconic()) >=[(^l  
 {  }Y;K~J  
  CPaintDC dc(this); // device context for painting gNt(,_]ZR  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ZYC<Wb)I  
  // Center icon in client rectangle 1t)il^p4[;  
  int cxIcon = GetSystemMetrics(SM_CXICON); `@nl  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4$P0:  
  CRect rect; }GeSu|m(  
  GetClientRect(&rect); Y1]n^  
  int x = (rect.Width() - cxIcon + 1) / 2; 7(pF[LCF  
  int y = (rect.Height() - cyIcon + 1) / 2; :Nz9xD$S5  
  // Draw the icon J+`VujWT  
  dc.DrawIcon(x, y, m_hIcon); q FAT]{{  
 } N;\'N ne  
 else AvfNwE  
 { y&V@^ "`  
  CDialog::OnPaint(); EOCN&_Z;  
 } 6oGYnu;UZ  
} Uu`9 "  
Mnscb  
HCURSOR CCaptureDlg::OnQueryDragIcon() p6;OL@ \~  
{ :Of^xj>A  
 return (HCURSOR) m_hIcon; p,eTY[k?  
} \--8lH -K  
3.*8)NW  
void CCaptureDlg::OnCancel() H!$o$}A  
{ #w' kV#  
 if(bTray) [Al&  
  DeleteIcon();  iKT[=c  
  CDialog::OnCancel(); T\D}kQM  
} ,^2>k3=  
"thdPZ  
void CCaptureDlg::OnAbout() Eea*s'  
{ 4rLL[??  
 CAboutDlg dlg; oC0qG[yp9S  
 dlg.DoModal(); g\&g N  
} eS~LF.^Jw  
-w"VK|SGm  
void CCaptureDlg::OnBrowse() 5fd]v<  
{ ~5}* d  
 CString str; wY[+ZT  
 BROWSEINFO bi; NU5.o$  
 char name[MAX_PATH]; OG>}M$ Ora  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,,q10iF  
 bi.hwndOwner=GetSafeHwnd(); iMDM1}b  
 bi.pszDisplayName=name; ~kEI4}O  
 bi.lpszTitle="Select folder"; T7hcnF$  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; y.< m#Zzt  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); %`1q-,>v  
 if(idl==NULL) {+Rog/;S'  
  return; 8~@c)Z;  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); heV=)8  
 str.ReleaseBuffer(); ^LoUi1j  
 m_Path=str; 6\q]rfQ  
 if(str.GetAt(str.GetLength()-1)!='\\') :% ,:"  
  m_Path+="\\"; 8|l\E VV6  
 UpdateData(FALSE); L?mrba y  
} JehrDC2N  
klT@cO-9  
void CCaptureDlg::SaveBmp() $#9;)8J  
{ .uMn0PE   
 CDC dc; o<pf#tifv  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); m8d!< h  
 CBitmap bm; Bf~vA4  
 int Width=GetSystemMetrics(SM_CXSCREEN); i#vYyVr[  
 int Height=GetSystemMetrics(SM_CYSCREEN); e#$]Y?,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); j i7[nY  
 CDC tdc; Lr~=^{  
 tdc.CreateCompatibleDC(&dc); (ROY?5 @c  
 CBitmap*pOld=tdc.SelectObject(&bm); '!!CeDy  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ! |<Fo'U  
 tdc.SelectObject(pOld); L.*M&Ry  
 BITMAP btm; \Je0CD=e`  
 bm.GetBitmap(&btm); "Q@ronP(~  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -g*4(w  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 1mOh{:1u  
 BITMAPINFOHEADER bih; Y)*#)f  
 bih.biBitCount=btm.bmBitsPixel; nrub*BuA  
 bih.biClrImportant=0; 4;yKOQD|  
 bih.biClrUsed=0; keL&b/@  
 bih.biCompression=0; !>..Q)z  
 bih.biHeight=btm.bmHeight; @tNzQ8  
 bih.biPlanes=1; R;uvkg[o  
 bih.biSize=sizeof(BITMAPINFOHEADER); 3Q.#c,`jV  
 bih.biSizeImage=size; PNgY >=Y  
 bih.biWidth=btm.bmWidth; l rlgz[  
 bih.biXPelsPerMeter=0; W$hx,VEy`  
 bih.biYPelsPerMeter=0; &=] ~0$  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); -#u=\8  
 static int filecount=0; %)zodf  
 CString name; r!_-"~`7E  
 name.Format("pict%04d.bmp",filecount++); w0rRSD4S8B  
 name=m_Path+name; f e\$@-  
 BITMAPFILEHEADER bfh; zPn+ V7F  
 bfh.bfReserved1=bfh.bfReserved2=0; "O3tq =Q  
 bfh.bfType=((WORD)('M'<< 8)|'B'); vWz m @  
 bfh.bfSize=54+size; ` Mjj@[  
 bfh.bfOffBits=54; *\+\5pu0  
 CFile bf; PUp6Q;AdQ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Z'`<5A%;  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0l)~i' '  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [1g8*j~L  
  bf.WriteHuge(lpData,size); bzBEX mC  
  bf.Close(); x<tb  
  nCount++; s~ a"4~f  
 } f-vCm 5f  
 GlobalFreePtr(lpData); Dp,L/1GQ8  
 if(nCount==1) X( \ AB  
  m_Number.Format("%d picture captured.",nCount); xHv ZV<#  
 else f phv  
  m_Number.Format("%d pictures captured.",nCount); #+Ir>GU  
  UpdateData(FALSE); #L=x%8B  
} e$<0 7Oc  
LG{,c.Qj*  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) %9KldcQ}~  
{ N7b8m?!  
 if(pMsg -> message == WM_KEYDOWN) Xv ]W(f1  
 { +~m46eI  
  if(pMsg -> wParam == VK_ESCAPE) N)uSG&S:  
   return TRUE; 6Zm# bFQ  
  if(pMsg -> wParam == VK_RETURN) q;T{|5/O  
   return TRUE; x9UX!Z5*>  
 } L iN$ pwm  
 return CDialog::PreTranslateMessage(pMsg); )B"jF>9)[  
} ]sf7{lVT  
:%t U'w  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?pW`cFLDHF  
{ xgVeN["  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ aL+ o /  
  SaveBmp(); T0wW<_jh  
  return FALSE; HJ=:8:  
} !![DJ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ X9v.1s,  
 CMenu pop; H%qsjB^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1gL2ia  
 CMenu*pMenu=pop.GetSubMenu(0); b|l:fT?&  
 pMenu->SetDefaultItem(ID_EXITICON); #^u$  
 CPoint pt; eBZXI)pPh  
 GetCursorPos(&pt); .F98G/s  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); dI.WK@W'o  
 if(id==ID_EXITICON) w1Nm&}V  
  DeleteIcon(); g0xuxK;9c  
 else if(id==ID_EXIT) "h{q#~s  
  OnCancel(); kj#?whK6~  
 return FALSE; v|XTr,#  
} g/ T   
LRESULT res= CDialog::WindowProc(message, wParam, lParam); | k&Ck  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \(?rQg@U  
 AddIcon(); CM/H9Kz.  
 return res; $O&b``  
} $ Xv*,Bq  
nsu@h  
void CCaptureDlg::AddIcon() Xb|:vr\v  
{ B]nEkO'a:  
 NOTIFYICONDATA data; Y071Y:  
 data.cbSize=sizeof(NOTIFYICONDATA);  ~^NtO  
 CString tip; u 1J0$  
 tip.LoadString(IDS_ICONTIP); /hr7NT{e%v  
 data.hIcon=GetIcon(0); hQ,ch[j'  
 data.hWnd=GetSafeHwnd(); "0"nw 2g?  
 strcpy(data.szTip,tip); [<Mx2<8f  
 data.uCallbackMessage=IDM_SHELL; kvL=> A  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !j9t*2m[  
 data.uID=98; epA:v|S  
 Shell_NotifyIcon(NIM_ADD,&data); (yH'{6g\  
 ShowWindow(SW_HIDE); [^WC lRF  
 bTray=TRUE; Fco`^kql.D  
} {{$Nqn,pH  
:}He\V  
void CCaptureDlg::DeleteIcon() 9P1OP Xv*p  
{ (!ux+K  
 NOTIFYICONDATA data; )tC5Hijq,  
 data.cbSize=sizeof(NOTIFYICONDATA); 8 }I$'x  
 data.hWnd=GetSafeHwnd(); ~Otq %MQ  
 data.uID=98; k|e7a2Wwt  
 Shell_NotifyIcon(NIM_DELETE,&data); EaO6[E  
 ShowWindow(SW_SHOW); 2,DXc30I  
 SetForegroundWindow(); R{C(K(5/  
 ShowWindow(SW_SHOWNORMAL); `l\7+0W  
 bTray=FALSE; m( r,Acy6  
} =:xW>@bh|  
+%+tr*04O  
void CCaptureDlg::OnChange() KoOz#,()  
{ f}o\*|k_|  
 RegisterHotkey(); td(li.,  
} >~''&vdsk\  
z6KCv(zvB  
BOOL CCaptureDlg::RegisterHotkey() :y'Ah#  
{ OV1_|##LC  
 UpdateData(); -R|,9o^  
 UCHAR mask=0; 5dx$HE&b)  
 UCHAR key=0; -RE^tW*Yy  
 if(m_bControl) 3atBX5  
  mask|=4; Tr_w]'  
 if(m_bAlt) !{ y@od@T  
  mask|=2; R[zpD%CI  
 if(m_bShift) $.Qkb@}  
  mask|=1; ]&o$b]  
  key=Key_Table[m_Key.GetCurSel()]; ;;!yC  
 if(bRegistered){ NxkGOAOE  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ..IfP@  
  bRegistered=FALSE; V pE*(i$  
 } ~ 8PZ5;g  
 cMask=mask; u }#(.)a:  
 cKey=key; aZH:#lUlj  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); W =D4r  
 return bRegistered; 6|gCuT4  
} )MtF23k)g  
mUNn%E:7@{  
  四、小结 p\Q5,eg  
AiwOc+R  
  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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