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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: BB~OqZIP  
  O>^C4c!  
  一、实现方法 "kMguK}c  
wm)#[x #  
  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: u[ L`-zI  
2'_:S@  
#pragma data_seg("shareddata") bty/  
HHOOK hHook =NULL; //钩子句柄 |`lzfe  
UINT nHookCount =0; //挂接的程序数目 3=Cc.a/3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 oXxCXO,q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 &e;=cAXG  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey F{eU";D  
static int KeyCount =0; G`\f  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Xb{ [c+.  
#pragma data_seg() (xVsDAp=@  
|P -8HlOr  
  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。 #$c Rkw  
%kB8'a3  
  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: ZCB_  
r:F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR / C>wd   
cKey,UCHAR cMask) Y}uCP1v  
{ \|E^v6E%0  
 BOOL bAdded=FALSE; EmODBTu+  
 for(int index=0;index<MAX_KEY;index++){ -PS#Z0>  
  if(hCallWnd[index]==0){ ve% xxn:  
   hCallWnd[index]=hWnd; \8<BLmf4U  
   HotKey[index]=cKey; $)RNKMZC}A  
   HotKeyMask[index]=cMask; yto,>Utzg  
   bAdded=TRUE; WAn~ +=Ax  
   KeyCount++; B>GE 9y5  
   break; =0G!f$7^i  
  } _~*,m#uxJ  
 } ``OD.aY^s  
 return bAdded; :,J}z~I,lB  
} agjv{  
//删除热键 [1F* bI  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'ow.=1N-  
{ =li|  
 BOOL bRemoved=FALSE; 'g$(QvGF 9  
 for(int index=0;index<MAX_KEY;index++){ 4\6N~P86  
  if(hCallWnd[index]==hWnd){ iVd.f A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (cN}Epi(D  
    hCallWnd[index]=NULL; c05%iv  
    HotKey[index]=0; rk7QZVE  
    HotKeyMask[index]=0; R,|d`)T  
    bRemoved=TRUE; G(~;]xNW+  
    KeyCount--; r8,romE$  
    break; yQ^($#Yk  
   } <o+<H  
  } k'#(1(xj  
 } 7oq[38zB  
 return bRemoved;  b^p"|L  
} fH)YFn/  
D<Z p!J1o  
oiX+l5`pz  
  DLL中的钩子函数如下: tl><"6AIP  
Clh!gpB c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <<i3r|}  
{ 55;g1o}}f  
 BOOL bProcessed=FALSE; T'LIrf  
 if(HC_ACTION==nCode) sgO'wXcoP  
 { dw TMq*e  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 I('Un@hS  
   switch(wParam) v>Mnl  
   {  $6CwkM:  
    case VK_MENU: (s{RnD  
     MaskBits&=~ALTBIT; CE"JS-S?  
     break; u-tQ9ioKC  
    case VK_CONTROL: C&6IU8l\  
     MaskBits&=~CTRLBIT; XK: 9r{r{  
     break; M?[h0{^K  
    case VK_SHIFT: ^b7GH9<&  
     MaskBits&=~SHIFTBIT; rtL}W__  
     break; .N*Pl(<[  
    default: //judge the key and send message VMCLHpSfW  
     break; ({NAMc*  
   } k iRa+w:  
   for(int index=0;index<MAX_KEY;index++){ CYKr\DA  
    if(hCallWnd[index]==NULL) jiYmb8Q4D  
     continue; ZKXo-~=>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fgBM_c&9T  
    { 1&P<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Dgx8\~(E'  
     bProcessed=TRUE; J]q%gcM  
    } 8,atX+tc  
   } 7{xh8#m  
  } k<cgO[m   
  else if((lParam&0xc000ffff)==1){ //有键按下 L*Me."*  
   switch(wParam) /__PSK  
   { HgBGV0  
    case VK_MENU: MdXchO-Lyc  
     MaskBits|=ALTBIT; BSkDpr1C  
     break; 1y lk4@`  
    case VK_CONTROL: r)i>06Hd  
     MaskBits|=CTRLBIT; PI*82,f3dE  
     break; r%e KFS  
    case VK_SHIFT: Q7g>4GZC  
     MaskBits|=SHIFTBIT; 5bA)j!#)|X  
     break; ki{3IEOr}  
    default: //judge the key and send message z.CywME<)t  
     break; YG8>czC  
   } sF7^qrVQP9  
   for(int index=0;index<MAX_KEY;index++){ ]q6;#EUr?  
    if(hCallWnd[index]==NULL) [|lB5gi4t!  
     continue; doB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4&HXkRs:  
    { ay %KE=*v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $-&BB(-{E&  
     bProcessed=TRUE; t!2(7=P30(  
    } <HRBMSR+  
   } wP57Pf0  
  } -kS~xVS|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 >5wx+n)/)  
   for(int index=0;index<MAX_KEY;index++){ 1pCieTz!PN  
    if(hCallWnd[index]==NULL)  iL= m{  
     continue; 2jbIW*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZbT/$\0(6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); NO] 3*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 k6kM'e3V  
   } vm'5s]kdh  
  } J|3E-p\o  
 } tV9L D>3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,KJw|x4}\  
} s!9dQ.  
L.T?}o  
  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: N-g8}03  
BI:k#jO!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f""`cdqAOh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^ZM0c>ev=l  
"Pl9nE  
  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: yIb,,!y9{  
j,d*?'X  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) W- $a Y2  
{ ^VT1vu %03  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ^>?CMcN4*  
 { ~Z ~v  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 kGkA:g:  
  SaveBmp(); y{9~&r  
  return FALSE; Ro=AADv@  
 } WhBpv(q}.  
 …… //其它处理及默认处理 93IFcmO.H@  
} "7d-z<^n  
z^nvMTC  
NA$zd(  
  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。 0lM{l?  
jxgj,h"}9`  
  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。 GFk1/ F  
zciCcrJ  
  二、编程步骤 .bD_R7Bi6  
U Q@7n1  
  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"; YHV-|UNF  
(!5LW '3B  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; K~RoUE<3[  
/?/#B `  
  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`$L'  
+KEkmXZ  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; E^hHH?w+  
k#}g,0@  
  5、 添加代码,编译运行程序。 ?hYqcT[%  
!}M,  
三、程序代码 2}vg U$a  
WqrgRpM{  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL MYe HS   
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 2eQdQwX  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ?yXAu0  
#if _MSC_VER > 1000 %OcGdbs  
#pragma once Oq(VvS/  
#endif // _MSC_VER > 1000 he+#Q 6  
#ifndef __AFXWIN_H__ _kFYBd  
#error include 'stdafx.h' before including this file for PCH qJR!$?  
#endif 3}1ssU"T  
#include "resource.h" // main symbols qIwV q!=  
class CHookApp : public CWinApp I-NN29Sk  
{ _ia!mT <  
 public: $\a5&1rl  
  CHookApp(); :Zw @yt  
  // Overrides MVv1.6c7Y  
  // ClassWizard generated virtual function overrides {}>n{_  
  //{{AFX_VIRTUAL(CHookApp) H/~?@CE(YC  
 public: tGc ya0RL  
  virtual BOOL InitInstance(); P`1EPF  
  virtual int ExitInstance(); 2 4\g bv<  
  //}}AFX_VIRTUAL "L& k)J  
  //{{AFX_MSG(CHookApp) Q}2[hB  
  // NOTE - the ClassWizard will add and remove member functions here. 9vGs;  
  // DO NOT EDIT what you see in these blocks of generated code ! b1^n KB  
  //}}AFX_MSG Md; /nJO~{  
  DECLARE_MESSAGE_MAP() \ SCy$,m  
}; q$ghLGz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); r@)A k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r;cV&T/?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D>T],3U(H  
BOOL InitHotkey(); ,i`h x, Rg  
BOOL UnInit(); \Xg?Ug*9w  
#endif &w~Xa( uu  
OjnJV  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. fJ80tt?r  
#include "stdafx.h" Nofu7xiDw[  
#include "hook.h" 4,eQW[;kk  
#include <windowsx.h> zDBD.5R;  
#ifdef _DEBUG U :9=3A2$x  
#define new DEBUG_NEW nf%4sIQ*x  
#undef THIS_FILE 89eq[ |G_  
static char THIS_FILE[] = __FILE__; DR+,Y2!_GT  
#endif Q2'eQ0W{ o  
#define MAX_KEY 100 I ,FqN}  
#define CTRLBIT 0x04 ?s{C//  
#define ALTBIT 0x02 =q CF%~  
#define SHIFTBIT 0x01 <DiOWi  
#pragma data_seg("shareddata") 'wQy]zm$  
HHOOK hHook =NULL; 0g(6r-2)7  
UINT nHookCount =0; A]y*so!)>  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Gi$gtLtN h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }ymvC  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey F,Fo}YQX  
static int KeyCount =0; $iJnxqn  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ua& @GXvZ  
#pragma data_seg() m4**>!I  
HINSTANCE hins; %jKH?%Ih  
void VerifyWindow(); ;h+q  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) X5E '*W  
//{{AFX_MSG_MAP(CHookApp) m6so]xr  
// NOTE - the ClassWizard will add and remove mapping macros here. Ol cP(  
// DO NOT EDIT what you see in these blocks of generated code! t"YIq/08  
//}}AFX_MSG_MAP @InJ_9E  
END_MESSAGE_MAP() ^CQ1I0  
r{"uv=,`  
CHookApp::CHookApp() xii$e  
{ |!b9b(_j9  
 // TODO: add construction code here, &:auB:b  
 // Place all significant initialization in InitInstance _7 `E[&v  
} t,Q'S`eTU  
Jk*QcEE=  
CHookApp theApp; Y\8+}g;KR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7|~:P $M  
{ :@e\'~7sH  
 BOOL bProcessed=FALSE; {,v: GMsm  
 if(HC_ACTION==nCode) hT=f;6$  
 { 5&%fkZ0  
  if((lParam&0xc0000000)==0xc0000000){// Key up >Fh#DmQ  
   switch(wParam) ?d,M.o{0]  
   { l'2H 4W_+  
    case VK_MENU: b6Xi  
     MaskBits&=~ALTBIT; +/Z0  
     break; &:#A+4&  
    case VK_CONTROL: 4g'}h`kh  
     MaskBits&=~CTRLBIT; dk4D+*R  
     break; 4]u,x`6C  
    case VK_SHIFT: r$?Vx_f`Q  
     MaskBits&=~SHIFTBIT; 6'vi68  
     break; M%;"c?g  
    default: //judge the key and send message a'^0.1  
     break; M)tv;!eQ  
   } X=#It&m%s  
   for(int index=0;index<MAX_KEY;index++){ }(cY|  
    if(hCallWnd[index]==NULL) .SBc5KX  
     continue; JQH7ZaN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hJ4S3b  
    { s!i:0}U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); VB's  
     bProcessed=TRUE; }2mI*"%)\u  
    } -Fa98nV.WB  
   } tUrNp~ve,  
  } Ba<#1p7_  
  else if((lParam&0xc000ffff)==1){ //Key down TL]bY'%  
   switch(wParam) "bi  !=  
   { e+x*psQ  
    case VK_MENU: M.t@@wq  
     MaskBits|=ALTBIT; *H?t;,\  
     break; e-jw^   
    case VK_CONTROL: 7NeDs$  
     MaskBits|=CTRLBIT; k|l5"&K~.  
     break; a.1`\ $]d  
    case VK_SHIFT: =}"R5  
     MaskBits|=SHIFTBIT; Jtext%"eNg  
     break; HmFNE$k  
    default: //judge the key and send message {dDq*sLf  
     break; 22PGWSQ  
   } wJ/ ~q)  
   for(int index=0;index<MAX_KEY;index++) G IK u  
   { QT7_x`#J~o  
    if(hCallWnd[index]==NULL) \y@ eBW  
     continue; (26Bs':M~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =P)"NP7f'  
    { i>WOYI9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); E}Ljo  
     bProcessed=TRUE; :82?'aR  
    } P`z7@9*j  
   } CJ0$;et  
  } x Ridc^  
  if(!bProcessed){ R !jhwY$  
   for(int index=0;index<MAX_KEY;index++){ _dJp 3D  
    if(hCallWnd[index]==NULL) cxL,]27Bu  
     continue; j1W bD7*8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;B*L1'FF%t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,zc"udpKF  
   } b_q! >&c  
  } LH bZjZ2  
 } `CPZPp,l6`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5sG ]3z+1  
} }{P&idkv  
 ~WzMK  
BOOL InitHotkey() /DK*y S  
{ 58qaA\iw  
 if(hHook!=NULL){ o-L|"3 P  
  nHookCount++; ^ b=5 6~[  
  return TRUE; EPQ&?[6  
 } M4R%Gr,La  
 else M0Lon/%  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); b(g_.1[  
  if(hHook!=NULL) Ar\IZ_Q  
   nHookCount++; >+zAWK9  
  return (hHook!=NULL); U+:S7z@j?  
} u!hqq^1  
BOOL UnInit() Bidqf7v  
{ 6(\q< fx  
 if(nHookCount>1){ q] 2}UuM|U  
  nHookCount--; Sr4dY`V*:z  
  return TRUE; Uyz;U34 oI  
 } R~U2/6V  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ]|H]9mys98  
 if(unhooked==TRUE){ &z7N\n  
  nHookCount=0; .;]YJy  
  hHook=NULL; ,| $|kO/  
 } 40`9t Xn  
 return unhooked; l=Vowx.$2f  
} nC-c8y  
dY/|/eOt<K  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %iHyt,0v2  
{ [GcA.ABz  
 BOOL bAdded=FALSE; A}az m>  
 for(int index=0;index<MAX_KEY;index++){ d,Im&j_Z  
  if(hCallWnd[index]==0){ !~6'@UYo  
   hCallWnd[index]=hWnd; " 8~f  
   HotKey[index]=cKey; V#n?&-{V  
   HotKeyMask[index]=cMask; 1^n5CI|7u  
   bAdded=TRUE; iKP\/LR<n  
   KeyCount++; ]L5Z=.z&  
   break; AJJ%gxqGq  
  } | 7t=\  
 } )Mm;9UA  
 return bAdded; sa\|"IkD2  
} Enq6K1@%G  
k1~nd=p  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w a-_O<  
{ X3&SL~&>g  
 BOOL bRemoved=FALSE; fRca"vV  
 for(int index=0;index<MAX_KEY;index++){ [wXwKr  
  if(hCallWnd[index]==hWnd){ /6Jy'"+'0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]%vGC^  
    hCallWnd[index]=NULL; ')Dp%"\?  
    HotKey[index]=0; *!wO:< -  
    HotKeyMask[index]=0; b |o`Q7Hj  
    bRemoved=TRUE; =Qjw.6@  
    KeyCount--; I_jM-/3b  
    break; a:(: :m  
   } s$2l"|h>B  
  } LZZ:P  
 } yhJA;&}>  
 return bRemoved; *Bb|N--jI  
} dA_V:HP  
\E ? iw.}  
void VerifyWindow() .O@q5G  
{ {7ZtOe  
 for(int i=0;i<MAX_KEY;i++){ K%aPl~e  
  if(hCallWnd!=NULL){ [F BCz>  
   if(!IsWindow(hCallWnd)){ 5kRwSOG%'  
    hCallWnd=NULL; ~%8Q75tn.  
    HotKey=0; _k"&EW{ Ii  
    HotKeyMask=0; o[Wagg.%  
    KeyCount--; G{&yzHAuae  
   } Mo?t[]L   
  } D-2v>l_  
 } h1G*y  
} Cnc\sMDJ\B  
,&zjOc_v  
BOOL CHookApp::InitInstance()  01UR  
{ JYVxdvq1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); {{4p{  
 hins=AfxGetInstanceHandle(); 1b %T_a  
 InitHotkey(); {YO%JTQ  
 return CWinApp::InitInstance(); p'uqh e X  
} t^bdi}[  
S,)|~#5x  
int CHookApp::ExitInstance() ` + n  
{ Zh fD`@>&  
 VerifyWindow(); ="'P=Xh!8  
 UnInit(); w50Bq&/jX  
 return CWinApp::ExitInstance(); fW4cHB 9|  
} [iO$ c]!H  
+|}K5q\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #<PA- y  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 35N/v G0  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_  7KSGG1ts  
#if _MSC_VER > 1000 n'&`9M['%d  
#pragma once foP>w4pB  
#endif // _MSC_VER > 1000 Ql6ai  
yBD2  
class CCaptureDlg : public CDialog h3;o!FF  
{ 6Qzu-  
 // Construction -'p@ lk  
 public: gw&#X~em  
  BOOL bTray; r PRuSk-f  
  BOOL bRegistered; h^ecn-PC  
  BOOL RegisterHotkey(); E;GR;i{t  
  UCHAR cKey; w?$u!X  
  UCHAR cMask; kT } '"  
  void DeleteIcon(); 0Z) ;.l^  
  void AddIcon(); X\$W'^np  
  UINT nCount; ~b6<uRnM.  
  void SaveBmp(); a@_Cx  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Oih2UrF  
  // Dialog Data v<J;S9u=  
  //{{AFX_DATA(CCaptureDlg) CAo )v,f  
  enum { IDD = IDD_CAPTURE_DIALOG }; ap$ tu3j  
  CComboBox m_Key; Ignv|TYG  
  BOOL m_bControl; ~q_+;W.  
  BOOL m_bAlt; ;iC'{S  
  BOOL m_bShift; moJT8tb  
  CString m_Path; kFIB lPV  
  CString m_Number; @aV~.!!  
  //}}AFX_DATA L..X)-D2 n  
  // ClassWizard generated virtual function overrides )Y,?r[4{  
  //{{AFX_VIRTUAL(CCaptureDlg) C"Y]W-Mgg  
 public: K%TKQ<R|  
  virtual BOOL PreTranslateMessage(MSG* pMsg); gM5p1?E  
 protected: UK <DcM~n  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Rn~Xu)@e  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); sQw`U{JG  
  //}}AFX_VIRTUAL ~~:8Yv[(  
  // Implementation ,pa&he  
 protected: gUszMhHX  
  HICON m_hIcon; 6[2?m*BsN  
  // Generated message map functions $-9@/%Y  
  //{{AFX_MSG(CCaptureDlg) `i)ePiE  
  virtual BOOL OnInitDialog(); Nj-rZ%&  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); FqUt uN  
  afx_msg void OnPaint(); d,rEEc Y  
  afx_msg HCURSOR OnQueryDragIcon(); UrcN?  
  virtual void OnCancel(); 4d._Hd='  
  afx_msg void OnAbout(); @Rb1)$~#  
  afx_msg void OnBrowse(); ,8o*!(uO2  
  afx_msg void OnChange(); :6k DUFj}  
 //}}AFX_MSG !4,xQ ^   
 DECLARE_MESSAGE_MAP() )(!Z90@  
}; 7CL@i L Tq  
#endif (F '  
8~Hs3\Hp  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file r=H\4%P4  
#include "stdafx.h" P"_}F  
#include "Capture.h" L%O8vn^3  
#include "CaptureDlg.h" Fx99"3`3  
#include <windowsx.h> n25tr'=  
#pragma comment(lib,"hook.lib") &|\}\+0Z  
#ifdef _DEBUG Vv)E41  
#define new DEBUG_NEW [O+^eE6h  
#undef THIS_FILE >\.[}th}  
static char THIS_FILE[] = __FILE__; ODvpMt:+  
#endif jG(~9P7  
#define IDM_SHELL WM_USER+1 "gikX/Co=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); D:vUy*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lvJ{=~u  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 6ym)F!t8l  
class CAboutDlg : public CDialog |wb(rua  
{ ?| LB:8  
 public: hGo|2@sc  
  CAboutDlg(); f uN XY-;  
  // Dialog Data 2-c0/?_4  
  //{{AFX_DATA(CAboutDlg) d~Ry>   
  enum { IDD = IDD_ABOUTBOX }; H'\EA(v+  
  //}}AFX_DATA bl>b/u7/6  
  // ClassWizard generated virtual function overrides g?AqC  
  //{{AFX_VIRTUAL(CAboutDlg) :;WDPRx  
 protected: Eg29|)qsz  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :aqskeT  
  //}}AFX_VIRTUAL EM w(%}8w  
  // Implementation })SdaZ  
 protected: T_%]#M  
  //{{AFX_MSG(CAboutDlg) 5 ^z ,'C  
  //}}AFX_MSG $(L7/M  
  DECLARE_MESSAGE_MAP() !gew;Jz  
}; N&h!14]{ Z  
6Oba}`)q9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 8 (h  
{ ^QQ NJ  
 //{{AFX_DATA_INIT(CAboutDlg) N_Ld,J%g  
 //}}AFX_DATA_INIT OwIy(ukTI  
} N~J Eia%  
6:tr8 X_  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) v ]U;5Uo  
{ y/6LMAI  
 CDialog::DoDataExchange(pDX); [IBk-opap  
 //{{AFX_DATA_MAP(CAboutDlg) AX RNV  
 //}}AFX_DATA_MAP }/r%~cZ  
} "[S 6w  
LhRe?U\  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) l{o{=]x1  
 //{{AFX_MSG_MAP(CAboutDlg) Z2jb>%  
 // No message handlers pP,bW~rk  
 //}}AFX_MSG_MAP ~WXxVm*@  
END_MESSAGE_MAP() &*GX:0=/>  
1+}Ud.v3VW  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +##I4vP  
: CDialog(CCaptureDlg::IDD, pParent) NT/B4'_@  
{ bu&y w~  
 //{{AFX_DATA_INIT(CCaptureDlg) )_K@?rWS  
  m_bControl = FALSE; r$Qh`[<  
  m_bAlt = FALSE; B&N&eRAE  
  m_bShift = FALSE; |bnjC$b*  
  m_Path = _T("c:\\"); t3g! 5  
  m_Number = _T("0 picture captured."); Q 9<_:3  
  nCount=0; j1+Y=@MA  
  bRegistered=FALSE; h18y?e7MU  
  bTray=FALSE; MXV4bgltT  
 //}}AFX_DATA_INIT S9oGf  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Qo *]l_UO;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); pPp nO  
} C P{h+yCj  
y<d#sv(s  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) o|q#A3%?  
{ M[_I16s  
 CDialog::DoDataExchange(pDX); Fsj[JE  
 //{{AFX_DATA_MAP(CCaptureDlg) 0Jh:6F  
  DDX_Control(pDX, IDC_KEY, m_Key); Uk\U*\.  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); uZI a-b  
  DDX_Check(pDX, IDC_ALT, m_bAlt); <5~>.DuE  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ,m]q+7E  
  DDX_Text(pDX, IDC_PATH, m_Path); j~q`xv+R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 'Sh5W%NM  
 //}}AFX_DATA_MAP x)L@x Q  
} c$fM6M }  
&}1)]6q$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) NLY5L7  
//{{AFX_MSG_MAP(CCaptureDlg) G)7sXEe  
 ON_WM_SYSCOMMAND() Q4q#/z  
 ON_WM_PAINT() !F)oX7"  
 ON_WM_QUERYDRAGICON() `Cxe`w4  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _AYF'o-Cm  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  V}qmH2h  
 ON_BN_CLICKED(ID_CHANGE, OnChange) UXHFti/A<  
//}}AFX_MSG_MAP *Fws]y2t~  
END_MESSAGE_MAP() IhLfuyFWu  
R 0}%   
BOOL CCaptureDlg::OnInitDialog() .SN]hLV5  
{ nT"z(\i.!J  
 CDialog::OnInitDialog(); }}_l@5  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); q?&&:.H"?5  
 ASSERT(IDM_ABOUTBOX < 0xF000); q =6 Y2Q  
 CMenu* pSysMenu = GetSystemMenu(FALSE); zn|}YovY+  
 if (pSysMenu != NULL) J~.kb k  
 { mN02T@R-  
  CString strAboutMenu; ^h=kJR9  
  strAboutMenu.LoadString(IDS_ABOUTBOX); n} {cs  
  if (!strAboutMenu.IsEmpty()) 's<}@-]  
  { 2|BE{91  
   pSysMenu->AppendMenu(MF_SEPARATOR); kx[8#+P  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); RMK U5A7  
  } 2uVm?nm  
 } 4a-wGx#h  
 SetIcon(m_hIcon, TRUE); // Set big icon .Ko`DH~!,C  
 SetIcon(m_hIcon, FALSE); // Set small icon "Q1hP9xV  
 m_Key.SetCurSel(0); s3J$+1M >  
 RegisterHotkey(); vaL-Mi(_  
 CMenu* pMenu=GetSystemMenu(FALSE); z@~rm9d  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 14RL++  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); pjFgIG2=9  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); B|v fkX2f  
 return TRUE; // return TRUE unless you set the focus to a control n :P}K?lg  
} ?3#X5WT  
srL,9)O C  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) YSbN=Rj  
{ yFG&Ir  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ? t-2oLE  
 { P6Ei!t,>  
  CAboutDlg dlgAbout; x% 1Rp[  
  dlgAbout.DoModal(); M3%< kk-_  
 } 'mF}+v^   
 else =#fqFL,  
 { kel48B  
  CDialog::OnSysCommand(nID, lParam); U*cj'`eqC  
 } _wBPn6gg`  
} ,P^"X5$   
&D:88   
void CCaptureDlg::OnPaint() Y2Bu,/9^  
{ A@UnrbX:  
 if (IsIconic()) bPNsy@"6  
 { a'BBp6  
  CPaintDC dc(this); // device context for painting 1Q<a+ l  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Yh=Zn[ U  
  // Center icon in client rectangle \T0`GpE  
  int cxIcon = GetSystemMetrics(SM_CXICON); X`&E,;bIb  
  int cyIcon = GetSystemMetrics(SM_CYICON); D$ \ EZ   
  CRect rect; $3>|R lxYA  
  GetClientRect(&rect); Go4l#6  
  int x = (rect.Width() - cxIcon + 1) / 2; 5zU$_M  
  int y = (rect.Height() - cyIcon + 1) / 2; 9V~yK?  
  // Draw the icon -UO$$)Q  
  dc.DrawIcon(x, y, m_hIcon); o&=m]hKpQl  
 } 6o!"$IH4  
 else ^IpS 3y  
 { Ne%X:h  
  CDialog::OnPaint(); WVZ\4y  
 } n):VuOjm  
} Ap/WgVw;  
D+OkD-8q  
HCURSOR CCaptureDlg::OnQueryDragIcon() gIeo7>u  
{ [eImP V]  
 return (HCURSOR) m_hIcon; ec|IT0;  
} BtspnVB ez  
q6q= ,<T%S  
void CCaptureDlg::OnCancel() 7 UR)4dYA  
{ @:}z\qBM  
 if(bTray) piU4%EO  
  DeleteIcon(); [30e>bSf`  
  CDialog::OnCancel(); ,Fb#%r%  
} R0Qp*&AL  
q_!3<.sf  
void CCaptureDlg::OnAbout() '2NeuK-KD  
{ &f[[@EF7  
 CAboutDlg dlg; /)~M cP3  
 dlg.DoModal(); E>&dG:3no  
} "QMHY\C  
Epx.0TA=t  
void CCaptureDlg::OnBrowse() t;'__">:q  
{ _v-sb(* J  
 CString str; jsuQ R  
 BROWSEINFO bi; r_)*/  
 char name[MAX_PATH]; }G]]0Oi2  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); # aC}\  
 bi.hwndOwner=GetSafeHwnd(); x[]n\\a?  
 bi.pszDisplayName=name; M:ttzsd  
 bi.lpszTitle="Select folder"; sviGS&J9h  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 9rhz#w  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); bp }~{]:b  
 if(idl==NULL) 17-K~ybc  
  return; mV-MJ$3r  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ba"Z^(:  
 str.ReleaseBuffer(); h-<+Pjc  
 m_Path=str; \eN}V  
 if(str.GetAt(str.GetLength()-1)!='\\') IlH*s/  
  m_Path+="\\"; .69{GM?  
 UpdateData(FALSE); by- B).7  
} b(wiJ&t  
'i}Q R~pe  
void CCaptureDlg::SaveBmp() [xHK^JP 8F  
{ .^/OL}/~<  
 CDC dc; ss*dM.b  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); STO6cNi  
 CBitmap bm; +?%huJYK,  
 int Width=GetSystemMetrics(SM_CXSCREEN); $N~8 ^6  
 int Height=GetSystemMetrics(SM_CYSCREEN); )F:hv[iv  
 bm.CreateCompatibleBitmap(&dc,Width,Height); TtHqdKL  
 CDC tdc; o_?YYw-:  
 tdc.CreateCompatibleDC(&dc); -q[?,h  
 CBitmap*pOld=tdc.SelectObject(&bm); 7uYJ _R  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3iDRt&y=.  
 tdc.SelectObject(pOld); WO|#`HM2  
 BITMAP btm; a4c~ThbI  
 bm.GetBitmap(&btm); l/SbJrM*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Kpg]b"9.R  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |@Bl?Bs+  
 BITMAPINFOHEADER bih; (%tKGeb  
 bih.biBitCount=btm.bmBitsPixel; vFQ'sd]C  
 bih.biClrImportant=0; b?y3m +V`  
 bih.biClrUsed=0; +g(QF   
 bih.biCompression=0; >xT8[  
 bih.biHeight=btm.bmHeight; -e30!A  
 bih.biPlanes=1; tv5SQ+AI3  
 bih.biSize=sizeof(BITMAPINFOHEADER); L.>`;`dmY  
 bih.biSizeImage=size; ZZ#S\*  
 bih.biWidth=btm.bmWidth; g^=p)h3  
 bih.biXPelsPerMeter=0; p9 %7h.  
 bih.biYPelsPerMeter=0;  IS!sJc  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); moh7:g  
 static int filecount=0; Nb-;D)W;B  
 CString name; 1I_(!F{Ho  
 name.Format("pict%04d.bmp",filecount++); (Ori].{C.J  
 name=m_Path+name; kA fkQy(~  
 BITMAPFILEHEADER bfh; 5MT$n4zKu  
 bfh.bfReserved1=bfh.bfReserved2=0; p;g$D=2  
 bfh.bfType=((WORD)('M'<< 8)|'B'); :dK/}S0  
 bfh.bfSize=54+size; 4\3Z$%2^LZ  
 bfh.bfOffBits=54; |*Hw6m  
 CFile bf; U5odSR$  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ JW (.,Ztm  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); >osY?9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +[ !K  
  bf.WriteHuge(lpData,size); LyH{{+V  
  bf.Close(); \It8+^d@  
  nCount++; SO9j/  
 } 2ACN5lyUS  
 GlobalFreePtr(lpData); L'.7V ~b{  
 if(nCount==1) I6~.sTl  
  m_Number.Format("%d picture captured.",nCount); = oQ-I  
 else Y`w+?}(M  
  m_Number.Format("%d pictures captured.",nCount); _uID3N%  
  UpdateData(FALSE); {U>B\D  
} qy"#XbBeV  
fM6Pw6k  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,F]Y,"x:  
{ YP/BX52 v  
 if(pMsg -> message == WM_KEYDOWN) 6Gwk*%sb  
 { 2/3,%5j_  
  if(pMsg -> wParam == VK_ESCAPE) m\RU |Z  
   return TRUE; 4u0=/pfi[  
  if(pMsg -> wParam == VK_RETURN) |#>\GU=!  
   return TRUE; <`}Oi 5nW  
 } rLtB^?A z  
 return CDialog::PreTranslateMessage(pMsg); 9 "7(Jq  
} vWc=^tT   
NJRk##Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) r3*0`Rup  
{ Yxp.`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,3=|a|p  
  SaveBmp(); u1R_u9  
  return FALSE; f%<kcM2  
} OrNi<TY>  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ gMS-mkZ  
 CMenu pop; e0Zwhz,  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); tJ;<=.n  
 CMenu*pMenu=pop.GetSubMenu(0); cks53/Z  
 pMenu->SetDefaultItem(ID_EXITICON); 2dg+R)%  
 CPoint pt; yhxen  
 GetCursorPos(&pt); }8`W%_Yk  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~gg(i"V  
 if(id==ID_EXITICON) e=e^;K4  
  DeleteIcon(); d^p af  
 else if(id==ID_EXIT) P@lDhzd  
  OnCancel(); 5P'o+Vwz  
 return FALSE; Va"H.]  
} lOB*M!8   
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Av6=q=D  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {S[+hUl  
 AddIcon(); [&y="6No  
 return res; X)6}<A  
} b/;!yOF  
nwSujD  
void CCaptureDlg::AddIcon() c$fi3O  
{ d+DdDr  
 NOTIFYICONDATA data; l}w9c`f  
 data.cbSize=sizeof(NOTIFYICONDATA); 7uy?%5  
 CString tip; k_ d)  
 tip.LoadString(IDS_ICONTIP); SUGB)vEa  
 data.hIcon=GetIcon(0); ' b?' u  
 data.hWnd=GetSafeHwnd(); Qg9*mlm`  
 strcpy(data.szTip,tip); *S _[8L"  
 data.uCallbackMessage=IDM_SHELL; d6RO2^  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4sJM!9eb[  
 data.uID=98; F/8="dM  
 Shell_NotifyIcon(NIM_ADD,&data); i*ibx;s-  
 ShowWindow(SW_HIDE); NWL\"xp `t  
 bTray=TRUE; .0ov>4,R  
} 5l_ >QB  
o4Ny9s  
void CCaptureDlg::DeleteIcon() TTGk"2 Q'  
{ v$n J$M&k  
 NOTIFYICONDATA data; [v0[,K  
 data.cbSize=sizeof(NOTIFYICONDATA); q!fdiv`  
 data.hWnd=GetSafeHwnd(); x{'3eJ^8  
 data.uID=98; *;N6S~_'Y  
 Shell_NotifyIcon(NIM_DELETE,&data); >{ /As][  
 ShowWindow(SW_SHOW); ioJ~k[T  
 SetForegroundWindow();  s*XE  
 ShowWindow(SW_SHOWNORMAL); S{uKm1a  
 bTray=FALSE; yW@0Q:  
} E8gbm&x*  
44r@8HO1  
void CCaptureDlg::OnChange() 5>S=f{ghFw  
{ @Yzdq\FI  
 RegisterHotkey(); An.Qi=Cv  
} Ng Jp2ut  
!<EQVqj6  
BOOL CCaptureDlg::RegisterHotkey() <]w(1{q(  
{ A vh"(j  
 UpdateData(); j:Y1  
 UCHAR mask=0; 9e aqq  
 UCHAR key=0; t%k1=Ow5i  
 if(m_bControl) - WEEnwZ  
  mask|=4; <i1.W !%  
 if(m_bAlt) isF jJPe  
  mask|=2; $E >)  
 if(m_bShift) J$+K't5BZ  
  mask|=1; HxE`"/~.7k  
  key=Key_Table[m_Key.GetCurSel()]; )8,)&F  
 if(bRegistered){ P&g.%8b~84  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5eL_iNqJM  
  bRegistered=FALSE; fR^aFT  
 } q8=hUD%5C  
 cMask=mask; )ZHo7X  
 cKey=key; [V2`t'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <+r<3ZBA  
 return bRegistered;  f3E%0cg  
} {y\5 9  
 MYk%p'  
  四、小结 {=Y3[  
lFZ}.  
  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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