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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: d2ohW|  
  ZR1+ O 8  
  一、实现方法 "VV914*z  
j,}4TDWa  
  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: 0;vtdM[_  
)nhfkW=e  
#pragma data_seg("shareddata") rwoF}}  
HHOOK hHook =NULL; //钩子句柄 q1UBKhpnH  
UINT nHookCount =0; //挂接的程序数目 --Oprl  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 c+1vqbqHG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 LlU' _}>  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey '#H&:Htm;L  
static int KeyCount =0; {b(rm,%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ?LM:RADCm  
#pragma data_seg() h>dxBN  
]yo_wGiwY  
  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。 F\JLbY{x]  
+q7qK*  
  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: b 1cd&e  
V{KjRSVf=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR O8gfiQqF&  
cKey,UCHAR cMask) 1x { XE*%;  
{ M z9 3  
 BOOL bAdded=FALSE; _O$tuC%  
 for(int index=0;index<MAX_KEY;index++){ -zprNQW  
  if(hCallWnd[index]==0){ o5>/}wIf  
   hCallWnd[index]=hWnd; /n(9&'H<  
   HotKey[index]=cKey; Pow|:Lau!  
   HotKeyMask[index]=cMask; ,`<]>;s  
   bAdded=TRUE; Bgf=\7;5  
   KeyCount++; mLJDxh'B  
   break; $>;a 'f~  
  } ?k"0w)8  
 } 7 xUE,)?  
 return bAdded; 3Mw}R6g@#  
} .M8=^,h^K  
//删除热键 B0v|{C   
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fO #?k<p  
{ ,pn ) >  
 BOOL bRemoved=FALSE; 9MT3T?IS  
 for(int index=0;index<MAX_KEY;index++){ 3#9uEDdE  
  if(hCallWnd[index]==hWnd){ RXM}hqeG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ am2a#4`  
    hCallWnd[index]=NULL; A$Wx#r7)  
    HotKey[index]=0; 0E yAMu  
    HotKeyMask[index]=0; pOKeEW<q  
    bRemoved=TRUE; =9(tsB gTX  
    KeyCount--; X\kjAMuW/*  
    break; NK~PcdGl  
   } k9 l^6#<?  
  }  *=TYVM9  
 } xLZ bU4  
 return bRemoved; ZlrhC= 0  
} s*f1x N<  
qT$ )Rb&  
Y5n>r@ )m  
  DLL中的钩子函数如下: c88_}%h?(  
8|6~o.B.G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) r( M[8@Nz  
{ VxkEez'|  
 BOOL bProcessed=FALSE; zMr&1*CDX  
 if(HC_ACTION==nCode) [NL -!  
 { $5x]%1 R  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 g#}tm<  
   switch(wParam) 9Yn)t#G'`F  
   {  y=#j`MH{>  
    case VK_MENU: o~;M"  
     MaskBits&=~ALTBIT; @*SA$9/l  
     break; w [L&*  
    case VK_CONTROL: 1#]B^D  
     MaskBits&=~CTRLBIT; O~atNrHD  
     break; 7u|%^Ao6  
    case VK_SHIFT: {d,?bs)  
     MaskBits&=~SHIFTBIT; \TZ|S,FS  
     break; z<i,D08|d  
    default: //judge the key and send message ;7L;  
     break; 3 &Sp@,  
   } k1 RV'  
   for(int index=0;index<MAX_KEY;index++){ /eb-'m  
    if(hCallWnd[index]==NULL) !O8.#+  
     continue; IhfZLE.,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cN5"i0xk  
    { wh*:\_!0\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ZL,6_L/  
     bProcessed=TRUE; t|_{;!^  
    } FD))'!>  
   }  jC4O`  
  } 6P^hN%0  
  else if((lParam&0xc000ffff)==1){ //有键按下 ~pRs-  
   switch(wParam) j$mz3Yk  
   { 0X#+#[W  
    case VK_MENU: !UVk9  
     MaskBits|=ALTBIT; \OT6L'l],  
     break; ]q&tQJ/Fa  
    case VK_CONTROL: G%$}WA]|  
     MaskBits|=CTRLBIT; Td&d,;  
     break; p jd o|  
    case VK_SHIFT: d+e0;!s~O  
     MaskBits|=SHIFTBIT;  ni<[G0#T  
     break; /e(W8aszi  
    default: //judge the key and send message AX K95eS  
     break; (7~%B"  
   } cf\&No?-p  
   for(int index=0;index<MAX_KEY;index++){ G1/Gq.<  
    if(hCallWnd[index]==NULL) .zIgbv s  
     continue; m &!XA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i?x$w{co  
    { T6X}Ws"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Cx,-_  
     bProcessed=TRUE; <S&]$?`{Wi  
    } 5e8xKL  
   } ki#bPgT  
  } )'t&q/Wn  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 5D L,U(Y  
   for(int index=0;index<MAX_KEY;index++){ 8gAu7\p}  
    if(hCallWnd[index]==NULL) ) P%4:P  
     continue; E<k ^S{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <%&_#<C)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); hX3@f;[B2  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Q vJZkGX  
   } =|"= l1  
  } gvlFumg2  
 } (gU2"{:]J  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]w-.|vx  
} F 3s?&T)[G  
Mt=R*M}D0  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: {[tZ.1.w  
#Z0-8<\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (kY@7)d'e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9DPb|+O-  
{Xv3:"E"O  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ]=Pu\eE  
]'g:B p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @k9Pz<ub  
{ 7f r>ZY^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0MrN:M2B  
 { ^vM_kAr A  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 1]Lh'.1^  
  SaveBmp(); P7UJ-2%Y+  
  return FALSE; x0ne8NDP  
 } Why"G1`  
 …… //其它处理及默认处理 f"P$f8$  
} _A3X6  
U=DEV7E  
Zw24f1iY  
  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。 8i[LR#D)  
N|<bVq%  
  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。 [<S^c[47U  
| k}e&Q_/G  
  二、编程步骤 \Z'/+}^h  
+A\V)  
  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"; q:8\ e  
K_&_z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; vpV$$=Qwp  
R[Nbtbv9Q  
  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; 5*1#jiq  
$L\@da?  
  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; AqqHD=Yp  
yW`e |!  
  5、 添加代码,编译运行程序。 R{`gR"*  
QTE:K?  
三、程序代码 I^:F)a:  
bRsc-Fz6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ;W~4L+e  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ~ k<SbFp  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 6klD22b2$  
#if _MSC_VER > 1000 HzEGq,.  
#pragma once y]^#$dK(z  
#endif // _MSC_VER > 1000 F|*tNJU>  
#ifndef __AFXWIN_H__ snq;:n!   
#error include 'stdafx.h' before including this file for PCH j%WY ,2P  
#endif Ro~fvL~Ps  
#include "resource.h" // main symbols 10O3Z9  
class CHookApp : public CWinApp 63C(Tp"  
{ PkO!'X  
 public: ])UwC-l  
  CHookApp(); I*( 1.%:m  
  // Overrides j.B>v\b_3  
  // ClassWizard generated virtual function overrides f~R[&q +  
  //{{AFX_VIRTUAL(CHookApp) A _i zSzC1  
 public: bBG/gQ  
  virtual BOOL InitInstance(); N6q5`Ry  
  virtual int ExitInstance(); 5W{hH\E _5  
  //}}AFX_VIRTUAL tUv3jq)n%  
  //{{AFX_MSG(CHookApp) RJwb@r<v  
  // NOTE - the ClassWizard will add and remove member functions here. 8$m1eQ`{  
  // DO NOT EDIT what you see in these blocks of generated code ! BjvdnbJg  
  //}}AFX_MSG rei5{PC  
  DECLARE_MESSAGE_MAP() `V@z&n0P6  
}; 1lsLG+Rpxi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); O:,=xIXR  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s-%J 5_d f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sJv`fjf%8  
BOOL InitHotkey(); :P,2K5]y  
BOOL UnInit(); B\/7^{i5  
#endif o X@nP?\  
N3Z@cp  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. yf?W^{^|  
#include "stdafx.h" ^}hZ'<PK  
#include "hook.h" ]) =H  
#include <windowsx.h> m3luhGn  
#ifdef _DEBUG AA2ui%  
#define new DEBUG_NEW y{92Lym  
#undef THIS_FILE bM5CDzH(#X  
static char THIS_FILE[] = __FILE__; lz}llLb1  
#endif Pa[?L:E  
#define MAX_KEY 100 p+)C$2YK  
#define CTRLBIT 0x04 #@E(<Pu4`  
#define ALTBIT 0x02 4]EvT=Ro  
#define SHIFTBIT 0x01 Rf?%Tv0\  
#pragma data_seg("shareddata") /`}6rXnw9  
HHOOK hHook =NULL; g}YToOs  
UINT nHookCount =0; B*2{M  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey BvQUn@ XE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ,H@TYw  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 6&mWIk^VC  
static int KeyCount =0; ?Nu#]u-  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift KX=/B=3~  
#pragma data_seg() #<UuI9  
HINSTANCE hins; V_lGj  
void VerifyWindow(); ^Eu_NUFe  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %UBPoq  
//{{AFX_MSG_MAP(CHookApp) PF`:1;P U  
// NOTE - the ClassWizard will add and remove mapping macros here. m|mG;8}pI  
// DO NOT EDIT what you see in these blocks of generated code! hwp/jO:7\  
//}}AFX_MSG_MAP "h$D7 mL  
END_MESSAGE_MAP() Hva{A #  
a}w&dE$!-  
CHookApp::CHookApp() pJn>oGeJ&  
{ 5c)wZ  
 // TODO: add construction code here, aX]y`  
 // Place all significant initialization in InitInstance Lg b  
} HwM /}-t  
0S_Ra+e  
CHookApp theApp; K)Ge  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) GajI\_o  
{ 3}yraX6r!  
 BOOL bProcessed=FALSE; h~ZNHSP:  
 if(HC_ACTION==nCode) "~Us#4>  
 { 0OEtU5lf`y  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7F~xq#Wi#  
   switch(wParam) j~.u>4  
   { jWhD5k@v  
    case VK_MENU: yG4MUf6  
     MaskBits&=~ALTBIT; F; 0Dp  
     break; #|q;t   
    case VK_CONTROL: ,rXW`7!2  
     MaskBits&=~CTRLBIT; bu;vpNa  
     break; ]Px:d+wX:  
    case VK_SHIFT: XGL"gD   
     MaskBits&=~SHIFTBIT; aK-N}T  
     break; eZ[#+0J  
    default: //judge the key and send message iKY-;YK  
     break; jD<9=B(g  
   } :ECw \_"0$  
   for(int index=0;index<MAX_KEY;index++){ 7;~ 2e  
    if(hCallWnd[index]==NULL) oUCVd}wH  
     continue; :%pw`b, =V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [&fWF~D-p<  
    { =g1D;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1/!nV  
     bProcessed=TRUE; Qve`k<Cj"  
    } K:C+/O  
   } 7~:>WMv9  
  } Kgps_tY%  
  else if((lParam&0xc000ffff)==1){ //Key down Gtf1}UJC  
   switch(wParam) 2 e )  
   { gZ=) qT]Pj  
    case VK_MENU: k#BU7Exij  
     MaskBits|=ALTBIT; (]o FB$  
     break; Af$0 o=".  
    case VK_CONTROL: ?! !;XW  
     MaskBits|=CTRLBIT; x>'?IJZ  
     break; /\Jc:v#Q  
    case VK_SHIFT: -0/=k_q_  
     MaskBits|=SHIFTBIT; {3jm%ex  
     break; @ $ 9m>6V  
    default: //judge the key and send message *'s&/vEy  
     break; +W!'B r  
   } Id; mn}+~  
   for(int index=0;index<MAX_KEY;index++) RiwEuY  
   { [Q7`RB  
    if(hCallWnd[index]==NULL)  ;I[ .  
     continue; zjzqKdy}F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @:I \\S@bN  
    { 4+ykE:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [<,0A]m   
     bProcessed=TRUE; X*(gT1"t  
    } `>$g y/N  
   } %9fa98>  
  } !x+MVJ]  
  if(!bProcessed){ h4B+0  
   for(int index=0;index<MAX_KEY;index++){ <#:Ebofsn  
    if(hCallWnd[index]==NULL) _Jt_2o%G  
     continue; ]KfghRUH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A632 :V  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &:IfhS  
   } jqV)V>M.  
  } aU,0gvI(}  
 } zS#f%{   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Tq_1wX'\  
} H!Fr("6}  
$@XPL~4  
BOOL InitHotkey() 3^uL`ETm@  
{ ;2+ FgOj  
 if(hHook!=NULL){ 9CgXc5  
  nHookCount++; r! cNc  
  return TRUE; vy>];!Cu  
 } +y tT)S  
 else 3uB=L 7.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ^d5gz0d  
  if(hHook!=NULL) vY8WqG]  
   nHookCount++; ^' edE5  
  return (hHook!=NULL); /TR"\xQF  
} qJe&jLZa  
BOOL UnInit() i'[n`|c<  
{ HPv&vdr3  
 if(nHookCount>1){ %`t]FV^#  
  nHookCount--; *rujdQf  
  return TRUE; $_%2D3-;D  
 } 'US8"83  
 BOOL unhooked = UnhookWindowsHookEx(hHook); )of5229  
 if(unhooked==TRUE){ nA{ncTg1\  
  nHookCount=0; %FXIlH5  
  hHook=NULL; 2 `q^Q  
 } 7N-CtQnv  
 return unhooked; *)}Ap4[  
} =N[V{2}q  
 (9'G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) o}j_eH l{  
{ HZ[68T[8b  
 BOOL bAdded=FALSE; ePIly)=X  
 for(int index=0;index<MAX_KEY;index++){ 9g<_JcN  
  if(hCallWnd[index]==0){ ,_e/a   
   hCallWnd[index]=hWnd; @eAGN|C5  
   HotKey[index]=cKey; Q}k_#w  
   HotKeyMask[index]=cMask; 7k[`]:*o  
   bAdded=TRUE; =]2RC1#}e  
   KeyCount++; MfZ}xu  
   break; ~0Q\Lp);  
  } :c+a-Py $E  
 } N`L' 4v)  
 return bAdded; uj+.L6S  
} wUZ(Tin  
&j wnM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *;ZW=%M  
{ O#uaGziFf  
 BOOL bRemoved=FALSE; OmoplJ+  
 for(int index=0;index<MAX_KEY;index++){ pE YrmC  
  if(hCallWnd[index]==hWnd){ lL(}dbT~N  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lhW#IiX  
    hCallWnd[index]=NULL; R+@sHsZ@  
    HotKey[index]=0; qU /Wg  
    HotKeyMask[index]=0; O #p)~V8~  
    bRemoved=TRUE; p0:&7,+a,  
    KeyCount--; 4u{E D(  
    break; eF gb6dSh  
   } 0YsN82IDD  
  } Xoa <r9  
 } qNuv?.7  
 return bRemoved; $O8EiC!f6  
} h\: tUEg#J  
3ec==.  
void VerifyWindow() Nsy9 h}+A  
{ z? b(|f\!  
 for(int i=0;i<MAX_KEY;i++){ ADwwiq#E  
  if(hCallWnd!=NULL){ aF4V|?+  
   if(!IsWindow(hCallWnd)){ [ XY:MU e  
    hCallWnd=NULL; r)Mx.`d!  
    HotKey=0; 3<1HqU  
    HotKeyMask=0; R;Ix<y{U  
    KeyCount--; Hhce:E@K  
   } b$$L]$q2  
  } 6r-<XNv)0  
 }  zxynEdO  
} UU:QK{{E  
0I ND9h. %  
BOOL CHookApp::InitInstance() Z:o' +oh  
{ v'2OHb#  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Kw5+4R(5  
 hins=AfxGetInstanceHandle(); bju,p"J1-E  
 InitHotkey(); +XaO?F[c  
 return CWinApp::InitInstance();   _c7  
} kdueQ(\  
s"^YW+HMb  
int CHookApp::ExitInstance() qT-nD}  
{ :8GxcqvCWq  
 VerifyWindow(); nbkky .e  
 UnInit(); f^yLwRUD  
 return CWinApp::ExitInstance(); kosJ]q'U  
} Q/9vDv  
R;,u >P "  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \5L4*  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %;\2QI`R  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ dQ2i{A"BKz  
#if _MSC_VER > 1000 Sr#fyr  
#pragma once iJp!ROI  
#endif // _MSC_VER > 1000 t BXsWY{  
YaE['a  
class CCaptureDlg : public CDialog @SMy0:c:  
{ {TN@KB  
 // Construction [2fiHE  
 public: x@bl]Z(ne/  
  BOOL bTray; V~^6 TS(  
  BOOL bRegistered; _$jJpy  
  BOOL RegisterHotkey(); !E.l yz  
  UCHAR cKey; [8J}da}  
  UCHAR cMask; ~Sem_U`G  
  void DeleteIcon(); %cjGeS6}  
  void AddIcon(); gu%'M:Xe  
  UINT nCount; AZ Lt'9UD  
  void SaveBmp(); V/[,1W[B  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor B[m{2XzGH  
  // Dialog Data )^' B:ic  
  //{{AFX_DATA(CCaptureDlg) moM&2rgdrQ  
  enum { IDD = IDD_CAPTURE_DIALOG }; _/w-gL{  
  CComboBox m_Key; b+#~N>|  
  BOOL m_bControl; @^4M~F%  
  BOOL m_bAlt; }T*xT>p^3  
  BOOL m_bShift; W;@ae,^  
  CString m_Path; R8W4 4I*R:  
  CString m_Number; l$ _+WC*wp  
  //}}AFX_DATA l?<z1Acd&  
  // ClassWizard generated virtual function overrides !{ )AV/\D  
  //{{AFX_VIRTUAL(CCaptureDlg) k^%ec3l  
 public:  ,8 NEnB  
  virtual BOOL PreTranslateMessage(MSG* pMsg); l$~bkVNL  
 protected: !?-5 hh1\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r#Oz0=0u  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); DO,&Foh\  
  //}}AFX_VIRTUAL S/:QVs  
  // Implementation e ~,'|~ C5  
 protected:  eJ\j{-  
  HICON m_hIcon; `j"G=%e3.  
  // Generated message map functions 59J$SE  
  //{{AFX_MSG(CCaptureDlg) }c#/1J7  
  virtual BOOL OnInitDialog(); 9TN5|x  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ML"P"&~u6  
  afx_msg void OnPaint(); f?I *`~k  
  afx_msg HCURSOR OnQueryDragIcon(); . t%Vx  
  virtual void OnCancel(); ^{+:w:g  
  afx_msg void OnAbout(); ~ai' M#  
  afx_msg void OnBrowse(); HaN _}UMP  
  afx_msg void OnChange(); 4g^+y.,r_f  
 //}}AFX_MSG rxk{Li<9  
 DECLARE_MESSAGE_MAP() \osQwGPV  
}; :Ty*i  
#endif +&8Ud8Q  
:\;uJ5  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ->9xw  
#include "stdafx.h" g~D6.OZU  
#include "Capture.h" Gv3Fg[MA@c  
#include "CaptureDlg.h" /g7?,/vnZ  
#include <windowsx.h> 6zZR:ej  
#pragma comment(lib,"hook.lib") (eE}W~Z  
#ifdef _DEBUG ' 1]bjW*!  
#define new DEBUG_NEW #]/T9:  
#undef THIS_FILE Ca"+t lO  
static char THIS_FILE[] = __FILE__; S&) >w5*]U  
#endif O!+5As  
#define IDM_SHELL WM_USER+1 * CGdfdxW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &_hCs![  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =9@yJ9c-  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Afl'-  
class CAboutDlg : public CDialog 17 iq  
{ JJ3JULL2  
 public: MF sy`aiS  
  CAboutDlg(); A+E@OOw*~  
  // Dialog Data  Hu2g (!  
  //{{AFX_DATA(CAboutDlg) :R\v# )C  
  enum { IDD = IDD_ABOUTBOX }; eyjUNHeh#  
  //}}AFX_DATA :Aiu!}\  
  // ClassWizard generated virtual function overrides p+D 6Z'B  
  //{{AFX_VIRTUAL(CAboutDlg) sBI%lrO  
 protected: !T(Omve)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support YEoT_>A$dB  
  //}}AFX_VIRTUAL V *y  
  // Implementation 2,nCGSfc  
 protected: d+ko"F|  
  //{{AFX_MSG(CAboutDlg) qyfxTQ5  
  //}}AFX_MSG {S(T1ua  
  DECLARE_MESSAGE_MAP() $s!meg@s  
}; 7V``f:#d  
FQ1oqqr  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *lF%8k"Al  
{ 3(p6ak2lv  
 //{{AFX_DATA_INIT(CAboutDlg) Q8:ocEhR  
 //}}AFX_DATA_INIT o_m.MMEU  
} g$LwXfg  
&JM;jS z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) L4Y3\4xXO  
{ dV  
 CDialog::DoDataExchange(pDX); hkI);M+@6  
 //{{AFX_DATA_MAP(CAboutDlg) QLg9aG|  
 //}}AFX_DATA_MAP Xe+FMbBco  
} @23x;x  
=6YO!B>7  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) (.+n1)L?  
 //{{AFX_MSG_MAP(CAboutDlg) @!O{>`  
 // No message handlers dF]8>jBOL  
 //}}AFX_MSG_MAP N)Kr4GC  
END_MESSAGE_MAP() @ xr   
4 Z)]Cq*3  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) XnOl*#P  
: CDialog(CCaptureDlg::IDD, pParent) M3`A&*\;  
{ kn|l3+  
 //{{AFX_DATA_INIT(CCaptureDlg) U8z"{  
  m_bControl = FALSE; X#<Sv>c^  
  m_bAlt = FALSE; ibw;BU  
  m_bShift = FALSE; EBLoRW=8ld  
  m_Path = _T("c:\\"); ;mlIWn  
  m_Number = _T("0 picture captured."); ]~ UkD*Ct  
  nCount=0; _S1uJ~j;E  
  bRegistered=FALSE; VNXVuM )c  
  bTray=FALSE; nP31jm+A  
 //}}AFX_DATA_INIT pjM|}i<'Q  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5C?1`-&65V  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :h~!#;w_  
} <2d@\"AoHE  
Ij_`=w<  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 3zHiu*2/!  
{ E1_4\ S*z  
 CDialog::DoDataExchange(pDX); hDsORh!i  
 //{{AFX_DATA_MAP(CCaptureDlg) #Qd3A  
  DDX_Control(pDX, IDC_KEY, m_Key); :nEV/"#F  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); .x%SbG<k{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); T,>e\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); k0?6.[ku  
  DDX_Text(pDX, IDC_PATH, m_Path); _"V0vV   
  DDX_Text(pDX, IDC_NUMBER, m_Number); lsi8?91  
 //}}AFX_DATA_MAP &0`7_g7G  
} &r%3)Z8Et  
UC@"<$'C  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) pC8i &_A  
//{{AFX_MSG_MAP(CCaptureDlg) [Nc  Ok,  
 ON_WM_SYSCOMMAND() Pme?`YO$x  
 ON_WM_PAINT() D IN PAyY  
 ON_WM_QUERYDRAGICON() [K- s\  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6'zy"UkH  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) rOT8!"  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %}:J 9vra  
//}}AFX_MSG_MAP 6B{Awm@v}X  
END_MESSAGE_MAP() .5xM7,  
'h6RZKG T  
BOOL CCaptureDlg::OnInitDialog() _: K\v8  
{ Efl+`6`J  
 CDialog::OnInitDialog(); a06DeRCej  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,V?,I9qf  
 ASSERT(IDM_ABOUTBOX < 0xF000); jU$PO\UTk  
 CMenu* pSysMenu = GetSystemMenu(FALSE); a=dN.OB}F7  
 if (pSysMenu != NULL) y"ck;OQD  
 { p3'+"sFU  
  CString strAboutMenu; &EOh}O<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Ui&$/%Z|  
  if (!strAboutMenu.IsEmpty()) X;NTz75  
  { b.;W|$.  
   pSysMenu->AppendMenu(MF_SEPARATOR); 6wgOmyJx  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Y)`+u#` R  
  } f14c} YY  
 } }^q#0`e(y  
 SetIcon(m_hIcon, TRUE); // Set big icon $Vzfhj-if  
 SetIcon(m_hIcon, FALSE); // Set small icon |z%,W/Ef  
 m_Key.SetCurSel(0); =Wa\yBj_;m  
 RegisterHotkey(); Zpmy)W]1  
 CMenu* pMenu=GetSystemMenu(FALSE); 7SCI_8`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); W% ud nJ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _?ZT[t<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); e+[J9;g  
 return TRUE; // return TRUE unless you set the focus to a control 7Go!W(8  
} ($kwlj~c  
JSU\Hh!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Y$^\D' .k  
{ 2OTpGl  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ipe;%as#  
 { 85mQHZ8aR  
  CAboutDlg dlgAbout; j^.P=;  
  dlgAbout.DoModal(); \bfHGo=  
 } 5hAg*zJb5o  
 else PR+!CFi&  
 { )-@EUN0E>5  
  CDialog::OnSysCommand(nID, lParam); *)<tyIHd  
 } 5z _)  
} +,lD_{}_  
LHb{9x  
void CCaptureDlg::OnPaint() '<Gqu_-  
{ @j6D#./7j  
 if (IsIconic()) v6:DA#0  
 { u#\3T>o%@  
  CPaintDC dc(this); // device context for painting pP @#|T  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); d\v _!7  
  // Center icon in client rectangle r!S iR(  
  int cxIcon = GetSystemMetrics(SM_CXICON); *u }):8=&R  
  int cyIcon = GetSystemMetrics(SM_CYICON); !Xm:$KH  
  CRect rect; ARE~jzakg  
  GetClientRect(&rect); 4]bT O  
  int x = (rect.Width() - cxIcon + 1) / 2;  oa|0=  
  int y = (rect.Height() - cyIcon + 1) / 2; ( nh!tC  
  // Draw the icon S,H{\c  
  dc.DrawIcon(x, y, m_hIcon); /2:r}O  
 } MD7[}cB  
 else 1 .M?Hp9i  
 { u2t<auE9^  
  CDialog::OnPaint(); R|suBF3  
 } jhLh~. 8  
} X'c5s~9  
luMNi^FQ  
HCURSOR CCaptureDlg::OnQueryDragIcon() CbZ1<r" /  
{ )~`zjVx_  
 return (HCURSOR) m_hIcon; dZW:Cf 9K  
} n>HNpy  
Vr*t~M>  
void CCaptureDlg::OnCancel() 1}6pq 2  
{ -cKR15  
 if(bTray) (GQy"IuFh  
  DeleteIcon(); ?vVkZsU  
  CDialog::OnCancel(); ,"'agg:St  
} 6]Jv3Re'(I  
"#7i-?=  
void CCaptureDlg::OnAbout() 1jL?z6S  
{ 1pV"< ,t  
 CAboutDlg dlg; n'ro5D  
 dlg.DoModal(); DB0xIP~i,?  
} Z|W=.RdA;  
z,9qAts?mh  
void CCaptureDlg::OnBrowse() 4Z_.Jdu w  
{ >b?,zWiw  
 CString str; ^{s)`j'I*  
 BROWSEINFO bi; 9hv\%_>o  
 char name[MAX_PATH]; ty78)XI  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); c:0$ M w=  
 bi.hwndOwner=GetSafeHwnd(); i`Tne3)  
 bi.pszDisplayName=name; ]HRZ9oP  
 bi.lpszTitle="Select folder"; qb_V ,b9  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; d>%_<pw  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); vl#/8]0!  
 if(idl==NULL) )L{\k$r!EM  
  return; C?O{l%0  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @:[/uqL  
 str.ReleaseBuffer(); nXN0~,+  
 m_Path=str; eYagI  
 if(str.GetAt(str.GetLength()-1)!='\\') ;cO0Y.V9l  
  m_Path+="\\"; >eC^]#c  
 UpdateData(FALSE); gor6c3i  
} ' 9,}N:p  
@.})nU  
void CCaptureDlg::SaveBmp() M;(lc?Rv  
{ O7.Is88!  
 CDC dc; ={fi&j  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); IOA{l N6  
 CBitmap bm; ri:fo'4TO  
 int Width=GetSystemMetrics(SM_CXSCREEN); eE&F1|8  
 int Height=GetSystemMetrics(SM_CYSCREEN); {?C7BClB  
 bm.CreateCompatibleBitmap(&dc,Width,Height); {e~d^^N5  
 CDC tdc; Xm*Dh#H  
 tdc.CreateCompatibleDC(&dc); 1kpI?Plki  
 CBitmap*pOld=tdc.SelectObject(&bm); /'I/sWEV  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); '1w<<?vX?  
 tdc.SelectObject(pOld); u&qdrKx  
 BITMAP btm; \z_@.Jw{  
 bm.GetBitmap(&btm); >$?Z&7Lv  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; L+,{*Uj[;  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); E`i;9e'S  
 BITMAPINFOHEADER bih; "-hgeQX  
 bih.biBitCount=btm.bmBitsPixel; :70oO}0m.  
 bih.biClrImportant=0; u4S3NLG)  
 bih.biClrUsed=0; dlW w=^  
 bih.biCompression=0; p?}Rolk7  
 bih.biHeight=btm.bmHeight; j#*K[  
 bih.biPlanes=1; +?c&Gazi  
 bih.biSize=sizeof(BITMAPINFOHEADER); 'g^]ZTxb  
 bih.biSizeImage=size; T|E;U  
 bih.biWidth=btm.bmWidth; &v:iC u^|  
 bih.biXPelsPerMeter=0; q%JV"9,  
 bih.biYPelsPerMeter=0; YFW+l~[#  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); MVdE7P  
 static int filecount=0; 7DI8r|~  
 CString name;  E5o0^^  
 name.Format("pict%04d.bmp",filecount++); P`"dj@1'  
 name=m_Path+name; 9@h>_1RJz  
 BITMAPFILEHEADER bfh; }n<dyX:a  
 bfh.bfReserved1=bfh.bfReserved2=0; "evLI?  
 bfh.bfType=((WORD)('M'<< 8)|'B'); |6&"r&  
 bfh.bfSize=54+size; sOHh&e  
 bfh.bfOffBits=54; Ad"::&&Wk  
 CFile bf; b*bR<|dTj  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ -du+iOe?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); J|ILG  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); DF|qNX  
  bf.WriteHuge(lpData,size); , vky  
  bf.Close(); f6m^pbQFl  
  nCount++; cJqPcCq(wn  
 } @p!["v&  
 GlobalFreePtr(lpData); }x%"Oq|2]x  
 if(nCount==1) 5X  
  m_Number.Format("%d picture captured.",nCount); _r ajm J  
 else :dK%=j*ZK  
  m_Number.Format("%d pictures captured.",nCount); C6Kz6_DQZ  
  UpdateData(FALSE); i P/I% D  
} *kDXx&7B$  
9)=as/o  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) d>(dSKx  
{ eo@:@O+bm  
 if(pMsg -> message == WM_KEYDOWN) IlaH,J7n  
 { ^ML2xh  
  if(pMsg -> wParam == VK_ESCAPE) 0^.q5#A2  
   return TRUE; g]3-:&F{c  
  if(pMsg -> wParam == VK_RETURN) :cOwTW?Fj  
   return TRUE; 7ed*dXY*  
 } =B; )h  
 return CDialog::PreTranslateMessage(pMsg); M HgS5b2  
} >`6^1j(3  
g'mkhF(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lRO4- y  
{ YKk%lZ.8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ }$b/g  
  SaveBmp(); /WM : Bj   
  return FALSE; >CYg\vas!  
} i4->XvC  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ au GN~"n^  
 CMenu pop; / {A]('t  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); BkIvoW_  
 CMenu*pMenu=pop.GetSubMenu(0); "U yw7  
 pMenu->SetDefaultItem(ID_EXITICON); p<jHUG4?'  
 CPoint pt; <H$CCo  
 GetCursorPos(&pt); ']qC,;2  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2)U3/TNe  
 if(id==ID_EXITICON) jL 2f74?1  
  DeleteIcon(); A?_2@6Y^  
 else if(id==ID_EXIT) ~>C!l k  
  OnCancel(); EmLPq!C  
 return FALSE; yqoi2J:  
} ~ 9'64  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); UH[ YH;3O  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) w| >Y&/IX  
 AddIcon(); /a]+xL  
 return res; 3 \kT#nr  
} `pLp+#1 `R  
\0b ",|"3  
void CCaptureDlg::AddIcon() eNXpRvY  
{ 5xRh'Jkyb  
 NOTIFYICONDATA data; wl! 'Bck=  
 data.cbSize=sizeof(NOTIFYICONDATA); EK#w: "  
 CString tip; Tvk=NJ  
 tip.LoadString(IDS_ICONTIP); X-t4irZ)  
 data.hIcon=GetIcon(0); #BM *40tch  
 data.hWnd=GetSafeHwnd(); bf}r8$,  
 strcpy(data.szTip,tip); .%*.nq  
 data.uCallbackMessage=IDM_SHELL; Ad]r )d{  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0}aJCJ9sx=  
 data.uID=98; IPJs$PtKok  
 Shell_NotifyIcon(NIM_ADD,&data); 0V1kZ.  
 ShowWindow(SW_HIDE); o]jo R3  
 bTray=TRUE; ~L?p/3m   
} L*FnFRhU  
(L~3nN;rr  
void CCaptureDlg::DeleteIcon() NeNKOW#X  
{ 2*Gl|@~N  
 NOTIFYICONDATA data; (spX3n%p  
 data.cbSize=sizeof(NOTIFYICONDATA); XLM 9+L  
 data.hWnd=GetSafeHwnd(); S:DB%V3  
 data.uID=98; gg6&Fzp  
 Shell_NotifyIcon(NIM_DELETE,&data); ==IL63  
 ShowWindow(SW_SHOW); =lVfrna  
 SetForegroundWindow(); b cOX/  
 ShowWindow(SW_SHOWNORMAL); !WbQ`]uN/#  
 bTray=FALSE; Th"7p:SE?  
} r"rEVx#1=  
ph69u #Og  
void CCaptureDlg::OnChange() xv1$,|^ts  
{ y 5=J6a2.  
 RegisterHotkey(); dLjT^ 9  
} % 3FI>\3  
x %$Z/  
BOOL CCaptureDlg::RegisterHotkey() 's*UU:R  
{ Q>||HtF$A  
 UpdateData(); 4N*^%  
 UCHAR mask=0; D:){T>  
 UCHAR key=0; HLk/C[`u,  
 if(m_bControl) O  89BN6p  
  mask|=4; \)r#?qn4z;  
 if(m_bAlt) g |2D(J  
  mask|=2; #&DJ3(T  
 if(m_bShift) ,$CZ (GQ  
  mask|=1; 3aW4Gs<g  
  key=Key_Table[m_Key.GetCurSel()]; jQf1h|e  
 if(bRegistered){ \*_qP*vq@  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); sba0Q[IY  
  bRegistered=FALSE; VeCpz[r  
 } heRQ|n.Dz)  
 cMask=mask; &(wik#S  
 cKey=key; Av/|={i  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $|A vT;4  
 return bRegistered; O:D`6U+0  
} ULsz<Hj  
~PS%^zxyn  
  四、小结 Oi7:J> [  
M8 ++JI  
  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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