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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: py,z7_Nuh  
  HZM&QZHx)`  
  一、实现方法 p'_* >%4~  
scA&:y  
  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: Jj([O2Eq$  
u/``*=Y@  
#pragma data_seg("shareddata") %+`$Lb?{  
HHOOK hHook =NULL; //钩子句柄 8Y&(o-R0  
UINT nHookCount =0; //挂接的程序数目 $_<,bC1[  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 QZd ,GY5{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 { \Q'eL8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey h"q`gj  
static int KeyCount =0; ymzlRs1^Ct  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 N.3M~0M*  
#pragma data_seg() P/0n) Q  
j4Lf6aUOX  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 mF#{"  
~xzRx$vU  
  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: ^OYar(  
\f%jN1z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR :;]6\/ky  
cKey,UCHAR cMask) QZzi4[-as  
{ N|8TE7- F|  
 BOOL bAdded=FALSE; Ga~IOlS  
 for(int index=0;index<MAX_KEY;index++){ P~=|R9 t  
  if(hCallWnd[index]==0){ CFn!P;.!  
   hCallWnd[index]=hWnd; 7]G3yt->  
   HotKey[index]=cKey; 5]gd,&^?>  
   HotKeyMask[index]=cMask; ZG<<6y*.  
   bAdded=TRUE; IEO5QV:u:  
   KeyCount++; qf+I2 kyS  
   break; ` 8.d  
  } mO]>(^c  
 } ^TnBtIU-B  
 return bAdded; p"Fj6T2  
} O~w&4F;{  
//删除热键 &s\w: 9In  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Lymy/9  
{ Ga$+x++'*  
 BOOL bRemoved=FALSE; #=+d;RdlW  
 for(int index=0;index<MAX_KEY;index++){ XG*Luc-v  
  if(hCallWnd[index]==hWnd){ {bl^O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ rFdovfb   
    hCallWnd[index]=NULL; gNN{WFHQX:  
    HotKey[index]=0; @e+QGd;}  
    HotKeyMask[index]=0; aQw?r  
    bRemoved=TRUE; mZ*!$P:vy"  
    KeyCount--; t&0pE(MO/  
    break; mmEr2\L  
   } Qnph?t>  
  } e=TB/W_  
 } b6Dve]  
 return bRemoved; X8p-VCkV  
} De\&r~bTW9  
h_Q9 c  
fY$M**/,  
  DLL中的钩子函数如下: jj.iW@m  
(B]rINY|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) mq su8ti  
{ OZs^c2 W  
 BOOL bProcessed=FALSE; xR\$2(  
 if(HC_ACTION==nCode) 27G6C`}  
 { TU7Qt<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 LEWeybT  
   switch(wParam) 8`kK)iCq  
   {  CR&v z3\Q  
    case VK_MENU: 9UZKL@KC  
     MaskBits&=~ALTBIT; "\)j=MI8u+  
     break; 8?h-H #h  
    case VK_CONTROL: ytK h[Uo  
     MaskBits&=~CTRLBIT; Hh4$Qr;R  
     break; BUuNI_?M#5  
    case VK_SHIFT: iLNKC'  
     MaskBits&=~SHIFTBIT; y2 yW91B,  
     break; OT&J OTk\  
    default: //judge the key and send message W{Ine> a'  
     break; DHd9yP9-  
   } C /\)-^  
   for(int index=0;index<MAX_KEY;index++){ O2-9Oo@#,  
    if(hCallWnd[index]==NULL) G!uoKiL  
     continue; 6ix8P;;}#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fOtL6/?  
    {  w:#yu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5_x8!v  
     bProcessed=TRUE; 6 `+dP"@  
    } a4Fe MCvV9  
   } S{7A3 x'B  
  } lqTTTk  
  else if((lParam&0xc000ffff)==1){ //有键按下 y}FTLX $  
   switch(wParam) xJ:15eDC  
   { /Z94<}C6b  
    case VK_MENU: ]ECzb/  
     MaskBits|=ALTBIT; s(o{SC'tt  
     break; 7H %>\^A^  
    case VK_CONTROL: # 4L[8(+V  
     MaskBits|=CTRLBIT; q okgu$2  
     break; L Me{5H  
    case VK_SHIFT: z}&?^YU*)`  
     MaskBits|=SHIFTBIT; L#1Y R}m  
     break; Lo5itW  
    default: //judge the key and send message gu7mGHn-  
     break; [kM)K'-  
   } vT#zc)j  
   for(int index=0;index<MAX_KEY;index++){ QX1QYwcmG  
    if(hCallWnd[index]==NULL) ~k'KS 7c  
     continue; ]v{f!r=}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Gt3V}"B3\  
    { D pI)qg#>V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m-dyvW+  
     bProcessed=TRUE; AK]{^Hvz  
    } 0&mOu #l  
   } ELZCrh6*  
  } TL-sxED,,D  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (sHqzWh  
   for(int index=0;index<MAX_KEY;index++){ w]J9Kv1)-  
    if(hCallWnd[index]==NULL) GsA/pXx  
     continue; XCc /\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) g"Mqh!{ FI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); WwG78b-OA  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ri=>evx  
   } q\cH+n)C  
  } F[BJhN*]a  
 } 4 |9M8ocR  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [*GIR0  
} .$pW?C 3e  
iZ}  w>1  
  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: |2z?8lx  
mtu/kd'(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {EE/3e@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (n_lu= E70  
_w0t+=&  
  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: ^1^k<  
:L*"OT7(6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #Drs=7w  
{ ,5$V;|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) {/#^v?,  
 { ? FGzw  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ~w_4 nE  
  SaveBmp(); 4wk-f7I(  
  return FALSE; GVhO}m  
 } h U\)CM  
 …… //其它处理及默认处理 {>PN}fk2QP  
} EhL 8rR  
KJ M :-z@  
ufyqfID  
  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。 eM Ym@~4  
Y /$`vgqs  
  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。 =@q 9,H  
q<Gn@xc'  
  二、编程步骤 e=ZwhRP  
J/X{ Y2f  
  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"; bL soKe  
onL&lE  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; AlT41v~6  
3C'`K ,  
  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; A(zF[\{]  
u>SGa @R)  
  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; exT O#*o  
y=7WnQc  
  5、 添加代码,编译运行程序。 XJ,P8nx  
1henQiIO  
三、程序代码 >oSNKE  
R1OC7q  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ` ]%\Y>(a}  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  O_^O1  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ b~dm+5W7  
#if _MSC_VER > 1000 VtIPw&KHW  
#pragma once erTb9`N4  
#endif // _MSC_VER > 1000 f'P}]_3(  
#ifndef __AFXWIN_H__ =2!AK[KxX  
#error include 'stdafx.h' before including this file for PCH {uH 4j4)2  
#endif `2`Nu:r^  
#include "resource.h" // main symbols m}/LMY  
class CHookApp : public CWinApp B w?Kb@  
{ x}o]R  
 public: tVVnQX  
  CHookApp(); |:yQOq|  
  // Overrides k.=67L  
  // ClassWizard generated virtual function overrides a Mp*Ap  
  //{{AFX_VIRTUAL(CHookApp) q,6 y{RyS  
 public: 5(e?,B }  
  virtual BOOL InitInstance(); :&: IZkO  
  virtual int ExitInstance(); ;]YQ WK  
  //}}AFX_VIRTUAL F[m"eEX  
  //{{AFX_MSG(CHookApp)  o"J>MAD  
  // NOTE - the ClassWizard will add and remove member functions here. O0OBkIj  
  // DO NOT EDIT what you see in these blocks of generated code ! 7LMad%  
  //}}AFX_MSG i\hH .7G1  
  DECLARE_MESSAGE_MAP() f[v~U<\R  
}; *AX)QKQ@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); yem*g1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NCbl|v=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )#ze  
BOOL InitHotkey(); )P4#P2  
BOOL UnInit(); R{{d4=:S  
#endif `s74g0h  
iC- ?F cA  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 5c6CH k`:  
#include "stdafx.h" gNk x]bm  
#include "hook.h" Y^5X>  
#include <windowsx.h> obWBX'  
#ifdef _DEBUG dv3+x\`9  
#define new DEBUG_NEW [ox!MQ+s  
#undef THIS_FILE r"#h6lYK&  
static char THIS_FILE[] = __FILE__; /?X1>A:*  
#endif K|*Cka{  
#define MAX_KEY 100 9`{[J['V  
#define CTRLBIT 0x04 2}`Q9?  
#define ALTBIT 0x02 N_S>%Z+  
#define SHIFTBIT 0x01 LL3RC6;e  
#pragma data_seg("shareddata") 8\c= Un  
HHOOK hHook =NULL; {MX_t/o=f  
UINT nHookCount =0; XP'Mv_!Z  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey <jd S0YT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &We1i &w  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey u*_I7.}9  
static int KeyCount =0; UJ' +Z6d  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift - bL 7M5  
#pragma data_seg() +o&E)S}wP  
HINSTANCE hins; VU,\OOp  
void VerifyWindow(); W}B 4^l  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) MU5@(s3B?  
//{{AFX_MSG_MAP(CHookApp) H -('!^  
// NOTE - the ClassWizard will add and remove mapping macros here. R<W#.mpo6  
// DO NOT EDIT what you see in these blocks of generated code! L'=e /&  
//}}AFX_MSG_MAP \ZrLh,6f.  
END_MESSAGE_MAP() ~N+lI\K  
/Z<"6g?  
CHookApp::CHookApp() Dz, Fu:)  
{ .N~qpynY  
 // TODO: add construction code here, a(CZGIB  
 // Place all significant initialization in InitInstance p '{ `Uvr  
} $t5 0<1  
Bm%.f!`  
CHookApp theApp;  /bA\O   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) y@g{:/cmO  
{ g;en_~g3j  
 BOOL bProcessed=FALSE; K]dqK'  
 if(HC_ACTION==nCode) PZ69aZ*Gs  
 { 0^44${bA  
  if((lParam&0xc0000000)==0xc0000000){// Key up 3}O.B r|  
   switch(wParam) g3{)AX[Uy  
   { e #l/jFJU  
    case VK_MENU: Wo5G23:xz  
     MaskBits&=~ALTBIT; bu"Jb4_a>  
     break; N]cGJU>$  
    case VK_CONTROL: Y+N^_2@+C  
     MaskBits&=~CTRLBIT; ^5vFF@to  
     break; p-V#nPb  
    case VK_SHIFT: )CS 7>Vx  
     MaskBits&=~SHIFTBIT; AEkgm^t.{  
     break; &*g5kh{  
    default: //judge the key and send message S8j;oJ2 d  
     break; u&l2s&i  
   } fX G+88:2  
   for(int index=0;index<MAX_KEY;index++){ M%4o0k]E,s  
    if(hCallWnd[index]==NULL) ><iEVrpN  
     continue; UNocm0!N'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DoWY*2E  
    { bTC2Ya  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )>a t]mH  
     bProcessed=TRUE; BXueOvO8  
    } A`u04Lm7  
   } v}dt**l  
  } o*/\ oVOq  
  else if((lParam&0xc000ffff)==1){ //Key down l ,)l"6OV  
   switch(wParam) {B|U8j[  
   { S4<@ji  
    case VK_MENU: | (P%<  
     MaskBits|=ALTBIT; P,AS`=z  
     break; 9\TvX!)h  
    case VK_CONTROL: ;}K1c+m!5V  
     MaskBits|=CTRLBIT; !$h%$se  
     break; 18w[T=7)  
    case VK_SHIFT: Zx25H"5j  
     MaskBits|=SHIFTBIT; Faa:h#  
     break; Q"8)'dL'  
    default: //judge the key and send message 7d/wT+f  
     break; n);2b\&  
   } S|;a=K&hS  
   for(int index=0;index<MAX_KEY;index++) _5M!ec  
   { )?'sw5C  
    if(hCallWnd[index]==NULL) ,)V*xpp  
     continue; +`f gn9p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =Z/'|;Vd_x  
    { +YT/od1t7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); hX)r%v:  
     bProcessed=TRUE; =pWpHbB.  
    } P;KbS~ SlC  
   } h0n0Dc{4  
  } k_V1x0sZ  
  if(!bProcessed){ wd*T"V3  
   for(int index=0;index<MAX_KEY;index++){ F-k1yZ?^  
    if(hCallWnd[index]==NULL) 8!>uC&bE8  
     continue; u!g=>zEu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /(n)I  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); UE7 P =B  
   } D]y6*Ha  
  } eJ{"\c(  
 } \, n'D  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (#c5Q&  
} X_s;j5ur  
#CV(F$\1{  
BOOL InitHotkey() avO+1<`4B  
{ ABhza|  
 if(hHook!=NULL){ vo Q,K9  
  nHookCount++; oBqP^uT>a|  
  return TRUE; 6z%3l7#7Yi  
 } %n}fkj'  
 else a,cDj  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); cdU2ph_  
  if(hHook!=NULL) R$,`}@VqZ3  
   nHookCount++; c}Z,xop<P{  
  return (hHook!=NULL); rA*,)I_v@  
} s>~&: GUwR  
BOOL UnInit() 9[T#uh!DC  
{ Si]Z`_  
 if(nHookCount>1){ 4)Pt]#Ti  
  nHookCount--; \<lV),  
  return TRUE; 0 {{7"  
 } Q k-y 0  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $6!`  
 if(unhooked==TRUE){ G&C)`};  
  nHookCount=0; ?2EzNNcS  
  hHook=NULL; ' 1P_*  
 } I4|p;\`fK  
 return unhooked; N0 ?O*a  
} 'Iyk`=R  
.v1rrH?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) rLL;NTN+/  
{ ]v_xEH}T  
 BOOL bAdded=FALSE; =Bo0Oei  
 for(int index=0;index<MAX_KEY;index++){ SVq7qc9K?  
  if(hCallWnd[index]==0){ m}uF&|5  
   hCallWnd[index]=hWnd; CQ,r*VAw  
   HotKey[index]=cKey; E=s`$ A  
   HotKeyMask[index]=cMask; iUI,r*  
   bAdded=TRUE; AU'{aC+p  
   KeyCount++; K&|zWpb  
   break; {z F  
  } eA4*Be;9e  
 } m(OBk;S~   
 return bAdded; k}T~N.0  
} kIW Q`)'  
gP1$#KgU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) UO:>^,(j  
{ BM&'3K_y  
 BOOL bRemoved=FALSE; Q ;k_q3  
 for(int index=0;index<MAX_KEY;index++){ +#B%YK|LR  
  if(hCallWnd[index]==hWnd){ =?*V3e3{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3J,/bgL5  
    hCallWnd[index]=NULL; #UWQ (+F  
    HotKey[index]=0; 6@F Z,e  
    HotKeyMask[index]=0; 3"L$*toRA  
    bRemoved=TRUE; Be]o2N;J  
    KeyCount--; '.kbXw0}  
    break; *;gi52tM  
   }  &R^mpV5  
  } xD1wHp!+  
 } .!6ufaf$  
 return bRemoved; nQ~q -=,L  
} -5>g 0o2  
T@vVff  
void VerifyWindow() uo%O\} #u9  
{ \pPq ]k  
 for(int i=0;i<MAX_KEY;i++){ T2(+HI2  
  if(hCallWnd!=NULL){ ^9{ 2  
   if(!IsWindow(hCallWnd)){ KPO((G0&  
    hCallWnd=NULL; lJYv2EZ  
    HotKey=0; \uPT-M*  
    HotKeyMask=0; 6|jE3rHw  
    KeyCount--; 3 t_5Xacj  
   } X*Q7Yu  
  } 9QX{b+}"e  
 } D 3HB`{  
} >=Rb:#UM  
ljf9L:L  
BOOL CHookApp::InitInstance() ]g)%yuox9F  
{ ovfw_  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); \@F{Q-  
 hins=AfxGetInstanceHandle(); ix/uV)]k`  
 InitHotkey(); CNN?8/u!@  
 return CWinApp::InitInstance(); kU^@R<Fo  
} :iWV:0)P  
hOC,Eo  
int CHookApp::ExitInstance() vcSS+  
{ TX+t   
 VerifyWindow(); #UI`G3w<  
 UnInit(); }}xR?+4A  
 return CWinApp::ExitInstance(); -OW$  
} oz0-'_  
:m~lgb<  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~g,QwaA[  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .s9Iymz  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ kN) pi "  
#if _MSC_VER > 1000 *lTu-  
#pragma once JC+VG;kcs  
#endif // _MSC_VER > 1000 w'e enIX^^  
;s!H  
class CCaptureDlg : public CDialog 07MLK8jS  
{ #nxx\,i>  
 // Construction u4nXK <KL|  
 public: xAO ]u[J  
  BOOL bTray; nbRg<@  
  BOOL bRegistered; %B?5l^W@  
  BOOL RegisterHotkey(); FG(`&S+,  
  UCHAR cKey; V,"'k<y  
  UCHAR cMask; GkO6r'MVE  
  void DeleteIcon(); L7b{H2 2  
  void AddIcon(); EtcamI*`  
  UINT nCount; Xg)yz~Ug  
  void SaveBmp(); }B.C#Y$@  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor j)0R*_-B[  
  // Dialog Data Nl8Cctrf  
  //{{AFX_DATA(CCaptureDlg) 4NzHzn  
  enum { IDD = IDD_CAPTURE_DIALOG }; t.TQ@c+,J  
  CComboBox m_Key; oe<Y,%u"6  
  BOOL m_bControl; hh{liS% 10  
  BOOL m_bAlt; OH(+]%B78  
  BOOL m_bShift; WT)")0)[  
  CString m_Path; >fdN`W }M  
  CString m_Number; O*PHo_&G  
  //}}AFX_DATA ^ Q}1&w%  
  // ClassWizard generated virtual function overrides zhe5i;M  
  //{{AFX_VIRTUAL(CCaptureDlg) -I*A  `M  
 public: kr/h^e  
  virtual BOOL PreTranslateMessage(MSG* pMsg); loB/w{r*x  
 protected: j AE0$u~.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,jWd?-NH  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); X>4`{x`  
  //}}AFX_VIRTUAL 9..k/cH  
  // Implementation Rju8%FRO  
 protected: Z8@]e}n  
  HICON m_hIcon; u0e#iX  
  // Generated message map functions Rb0{t[IU  
  //{{AFX_MSG(CCaptureDlg) LKZI@i)  
  virtual BOOL OnInitDialog(); }X?*o `sW  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); WWL Vy(  
  afx_msg void OnPaint(); _7<U[63  
  afx_msg HCURSOR OnQueryDragIcon(); d7P @_jO6  
  virtual void OnCancel(); ba ?k:b  
  afx_msg void OnAbout(); vB{b/xmah  
  afx_msg void OnBrowse(); ?uN(" I  
  afx_msg void OnChange(); ^m=%Ctu#  
 //}}AFX_MSG [:'n+D=T3M  
 DECLARE_MESSAGE_MAP() 8G P}g?%  
}; ( A)wcB  
#endif *J=ol  
1`t?5|s>  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file NZuFxJ-`  
#include "stdafx.h" THp `!l  
#include "Capture.h" |gz ,Ip{  
#include "CaptureDlg.h" SDwSlwf  
#include <windowsx.h> bij?q\  
#pragma comment(lib,"hook.lib") :I('xVNPz  
#ifdef _DEBUG /z5lxS@#  
#define new DEBUG_NEW #V 6 -*  
#undef THIS_FILE #77UKYj2L-  
static char THIS_FILE[] = __FILE__; U VKN#"_{  
#endif ^4[[+r  
#define IDM_SHELL WM_USER+1 %np#Bv-L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "Zk6B"o)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .7FI%  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )'~FDw\6  
class CAboutDlg : public CDialog Anv8)J!9u  
{ uH[0kh  
 public: OpLSjr  
  CAboutDlg(); N 3c*S"1  
  // Dialog Data E'8Bw7Tz  
  //{{AFX_DATA(CAboutDlg) 5m42Bqy"  
  enum { IDD = IDD_ABOUTBOX }; p'qH [<s  
  //}}AFX_DATA ;%<4U^2  
  // ClassWizard generated virtual function overrides s>\g03=  
  //{{AFX_VIRTUAL(CAboutDlg) 6~ `bAe`}  
 protected: +d f?N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e63|Z[8  
  //}}AFX_VIRTUAL o3qv945  
  // Implementation %b;+/s2W  
 protected: j!\0Fyr  
  //{{AFX_MSG(CAboutDlg) u2]g1XjeG  
  //}}AFX_MSG #:|?t&On  
  DECLARE_MESSAGE_MAP() 63S1ed [  
}; RHVv}N0  
%Be[DLtE"  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) SWb5K0YRn  
{ >EtP^Lu~f_  
 //{{AFX_DATA_INIT(CAboutDlg) HW72 6K*  
 //}}AFX_DATA_INIT dA/o4co  
} 2H[a Y%1T  
=7fh1XnW  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "ru1;I  
{ (N|xDl &;  
 CDialog::DoDataExchange(pDX); &o@5%Rz2/  
 //{{AFX_DATA_MAP(CAboutDlg) }dJ ~Iy  
 //}}AFX_DATA_MAP 8 -;ZPhN&  
} 3gy;$}Lq T  
NRSse"  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) QV$dKjMS  
 //{{AFX_MSG_MAP(CAboutDlg) Vor9 ?F&w  
 // No message handlers IGT_ 5te  
 //}}AFX_MSG_MAP [!? ,TGM}^  
END_MESSAGE_MAP() -/c1qLdQ  
0t?<6-3`/  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) K=TW}ZO  
: CDialog(CCaptureDlg::IDD, pParent) i%PHYSJ.  
{ YBIe'(p  
 //{{AFX_DATA_INIT(CCaptureDlg) MIF[u:&  
  m_bControl = FALSE; Az9J{)  
  m_bAlt = FALSE; [; ?{BB  
  m_bShift = FALSE; b^DV9mO4J  
  m_Path = _T("c:\\"); 8'"/gC{  
  m_Number = _T("0 picture captured."); %@93^q[\2  
  nCount=0;  _np>({  
  bRegistered=FALSE; Uv`v|S:+2  
  bTray=FALSE; h_G|.7!  
 //}}AFX_DATA_INIT 9~'Ip7X,!  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 MVP)rugU  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); X]MM7hMuR  
} [e@OHQM  
9c}]:3#XO  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?>jArzI  
{ G>S1Ld'MV  
 CDialog::DoDataExchange(pDX); 1vK(^u[  
 //{{AFX_DATA_MAP(CCaptureDlg) `Mn{bd  
  DDX_Control(pDX, IDC_KEY, m_Key); NvHy'  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); s k6|_  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ,tF" 4|#  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ^%$W S,  
  DDX_Text(pDX, IDC_PATH, m_Path); soQzIx  
  DDX_Text(pDX, IDC_NUMBER, m_Number); n;^k   
 //}}AFX_DATA_MAP ilcy/  
} Qn)[1v  
>\x_"oR  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) h9w^7MbO  
//{{AFX_MSG_MAP(CCaptureDlg) 1\J1yOL  
 ON_WM_SYSCOMMAND() 5YG@[ic  
 ON_WM_PAINT() K<  
 ON_WM_QUERYDRAGICON() _B7?C:8Q-  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) YSz$` 7i  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hPi :31-0  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0R5^p  
//}}AFX_MSG_MAP 2td|8vDA  
END_MESSAGE_MAP() -kri3?Y,  
X.AWs=:-  
BOOL CCaptureDlg::OnInitDialog() 'j<:FUDJ  
{ 2N8sq(LK{  
 CDialog::OnInitDialog(); ^@LhUs>3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); V?V)&y] 4  
 ASSERT(IDM_ABOUTBOX < 0xF000); Nw$[a$^n  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *ez~~ Y  
 if (pSysMenu != NULL) '"fU2M<.  
 { nP{sCH 1  
  CString strAboutMenu; p9 ,\{Is  
  strAboutMenu.LoadString(IDS_ABOUTBOX); bb0McEQy  
  if (!strAboutMenu.IsEmpty()) A"<)(M+kG  
  { Iam-'S5  
   pSysMenu->AppendMenu(MF_SEPARATOR); ny_ kr`$42  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9s6>9hMb)  
  } -f;j1bQ  
 } 5nM9!A\D  
 SetIcon(m_hIcon, TRUE); // Set big icon >-|90CSdSJ  
 SetIcon(m_hIcon, FALSE); // Set small icon # pjyhH@  
 m_Key.SetCurSel(0); g9weJ6@}M  
 RegisterHotkey(); + yP[(b/  
 CMenu* pMenu=GetSystemMenu(FALSE); ZJI1NCBZ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Up/u|A$0V  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 07LL)v~  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); W/ZahPPq  
 return TRUE; // return TRUE unless you set the focus to a control V=zM5MH2  
} N7HbOLpM  
6[3Ioh  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Zj+}T  
{  Vq)gpR  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) X6N]gD  
 { V.QzMF"o  
  CAboutDlg dlgAbout; L3=YlX`UL  
  dlgAbout.DoModal(); fF9oYOh|  
 } hzuMTKH9  
 else 71<PEawL  
 { X?v ^>mA  
  CDialog::OnSysCommand(nID, lParam); 5)>ZO)F&  
 } qnk,E-  
} 7ru9dg1?  
ZaUcP6[h  
void CCaptureDlg::OnPaint() ?m9UhLeaS=  
{ Va/@#=,q]  
 if (IsIconic()) K,C $J I  
 { M\?uDC9  
  CPaintDC dc(this); // device context for painting b6WC @j`*T  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {7![3`%7  
  // Center icon in client rectangle {?>bblw/d  
  int cxIcon = GetSystemMetrics(SM_CXICON); AR+\uD=\I-  
  int cyIcon = GetSystemMetrics(SM_CYICON); [>M*_1F  
  CRect rect; L4/TI(MP  
  GetClientRect(&rect); M8",t{7  
  int x = (rect.Width() - cxIcon + 1) / 2; [;IDTo!<>  
  int y = (rect.Height() - cyIcon + 1) / 2; JX\T {\m#  
  // Draw the icon il>x!)?o  
  dc.DrawIcon(x, y, m_hIcon); n2y/zP>TC  
 } ej"o?1l@  
 else 32bkouq  
 { ]2xx+P#Y  
  CDialog::OnPaint(); EYJi6#  
 } =~W0~lxX  
} An8%7xa7  
\\2k}TsB  
HCURSOR CCaptureDlg::OnQueryDragIcon() q(jkit~`A  
{ m_E[bDON  
 return (HCURSOR) m_hIcon; B::4Qme  
} x8pbO[_|  
x '=3&vc4  
void CCaptureDlg::OnCancel() B.Zm$JZ:  
{ iBtjd`V*  
 if(bTray)  [`hE^chd  
  DeleteIcon(); * Y%<b86U  
  CDialog::OnCancel(); %eutfM-?6  
} Mg a@JA"  
C`yvBt40r  
void CCaptureDlg::OnAbout() )O2Nlk~l&  
{ n ,&/D  
 CAboutDlg dlg; 4[LLnF--  
 dlg.DoModal(); _X,[]+ziu%  
} nL":0!DTRD  
!y qa?\v9  
void CCaptureDlg::OnBrowse() mX<Fuu}E*Z  
{  ^6)GS%R  
 CString str; '#,e @v  
 BROWSEINFO bi; 5q(]1|Se i  
 char name[MAX_PATH]; d%#!nq{vd  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); "'z,[v 50&  
 bi.hwndOwner=GetSafeHwnd(); kvW|=  
 bi.pszDisplayName=name; BrlzN='j}  
 bi.lpszTitle="Select folder"; cQ3W;F8|n  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 0|fb< "  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); "wnpiB}  
 if(idl==NULL) }pl]9  
  return; M('s|>\l  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =9qGEkd3  
 str.ReleaseBuffer(); lC'{QUC  
 m_Path=str; u0bfX,e2U  
 if(str.GetAt(str.GetLength()-1)!='\\') ?Do^stq'4  
  m_Path+="\\"; c-4m8Kg?L  
 UpdateData(FALSE); b!'l\~`{i  
} JQKC ;p  
Ow cVPu_  
void CCaptureDlg::SaveBmp() '%zN  
{ _pz,okO[V  
 CDC dc; K0EY<Ltq  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]6$,IKE7  
 CBitmap bm; KGV.S  
 int Width=GetSystemMetrics(SM_CXSCREEN); !US8aT  
 int Height=GetSystemMetrics(SM_CYSCREEN); c;:">NR  
 bm.CreateCompatibleBitmap(&dc,Width,Height); \)OZUch  
 CDC tdc; ||-nmOy  
 tdc.CreateCompatibleDC(&dc); Vs#"SpH{'  
 CBitmap*pOld=tdc.SelectObject(&bm); z-EwXE  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); B ~fSMB6h  
 tdc.SelectObject(pOld); csH2_+uG  
 BITMAP btm; ?muDTD%c  
 bm.GetBitmap(&btm); di6B!YQP  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Awu$g.  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S  ~@r  
 BITMAPINFOHEADER bih; {]wIM^$6+  
 bih.biBitCount=btm.bmBitsPixel; ~7dM!g{W  
 bih.biClrImportant=0; _j:UGMTi(U  
 bih.biClrUsed=0; ;{<aA 5  
 bih.biCompression=0; V]I:2k5  
 bih.biHeight=btm.bmHeight; ?PBa'g  
 bih.biPlanes=1; QGs1zfh*  
 bih.biSize=sizeof(BITMAPINFOHEADER); T>}0) s  
 bih.biSizeImage=size; Bk?8 zYp  
 bih.biWidth=btm.bmWidth; uije#cj#O  
 bih.biXPelsPerMeter=0; y[: ~CL  
 bih.biYPelsPerMeter=0; /@ y;iJk;  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); si_W:mLF{a  
 static int filecount=0; c |>=S)|  
 CString name; :P3{Nxa  
 name.Format("pict%04d.bmp",filecount++); 2O eshkE  
 name=m_Path+name; K(<$.  
 BITMAPFILEHEADER bfh; 8zhBA9Y#~  
 bfh.bfReserved1=bfh.bfReserved2=0; y }\r#"Z`  
 bfh.bfType=((WORD)('M'<< 8)|'B'); x^A7'ad0  
 bfh.bfSize=54+size; ""co6qo#>  
 bfh.bfOffBits=54; t#C,VwMe[  
 CFile bf; !Eq#[Gs  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <d5@CA+M  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); o^3FL||P#r  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); >(X #<`  
  bf.WriteHuge(lpData,size); ` ^DjEdUN  
  bf.Close(); rwiw Rh  
  nCount++; `E@kFJ(<On  
 } =M7TCE  
 GlobalFreePtr(lpData); EXuLSzQwv  
 if(nCount==1) MkwU<ae AB  
  m_Number.Format("%d picture captured.",nCount); D^Te%qnW  
 else w/ TKRCO3  
  m_Number.Format("%d pictures captured.",nCount); l , ..5   
  UpdateData(FALSE); qu_)`wB  
} {m[s<A(  
n-DaX kK  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) R{HV]o|qk  
{ R (G2qi  
 if(pMsg -> message == WM_KEYDOWN) +a%xyD:.?  
 { 3gAR4  
  if(pMsg -> wParam == VK_ESCAPE) X0`j-*,FX  
   return TRUE; m6^ 5S  
  if(pMsg -> wParam == VK_RETURN) lsk_P&M  
   return TRUE; 8p&kLo&  
 } "e 1wr  
 return CDialog::PreTranslateMessage(pMsg); *h$&0w y  
} -."kq.m*  
#ZJMlJ:q`"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Vtr3G.P^  
{ Ly;I,)w  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ i}v9ut]B  
  SaveBmp(); W{  fZ[z  
  return FALSE; @}Zd (o  
} Gqb])gXpl  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]4`t\YaT  
 CMenu pop; .2 0V 3  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); <47k@Ym   
 CMenu*pMenu=pop.GetSubMenu(0); WmeKl  
 pMenu->SetDefaultItem(ID_EXITICON); s=D f `  
 CPoint pt; }Dn^d}?s||  
 GetCursorPos(&pt); HTV ~?E  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); H3 , ut  
 if(id==ID_EXITICON) Zb(E:~h\  
  DeleteIcon(); AEY$@!8  
 else if(id==ID_EXIT) q/NY72tj0  
  OnCancel(); #E DEYEW7  
 return FALSE; 9Hd;35 3Q  
} !;S"&mcPDJ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); .[?BlIlm  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) R_^/,^1  
 AddIcon(); 0"78/6XIs  
 return res; _T5)n=|  
}  B/G-Yh$E  
/.Fj.6U5  
void CCaptureDlg::AddIcon() _%~$'Hy  
{ 54{q.I@n  
 NOTIFYICONDATA data; S,''>`w  
 data.cbSize=sizeof(NOTIFYICONDATA); $IVwA  
 CString tip; w7FoL  
 tip.LoadString(IDS_ICONTIP); oKA&An  
 data.hIcon=GetIcon(0); r3qf[?3`6  
 data.hWnd=GetSafeHwnd(); ySe$4deJ  
 strcpy(data.szTip,tip); ]N^*tO  
 data.uCallbackMessage=IDM_SHELL; YuQ~AE'i  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 7G<t"'  
 data.uID=98; y+9h~,:A  
 Shell_NotifyIcon(NIM_ADD,&data); w\Mnu}<e$  
 ShowWindow(SW_HIDE); ;#1Iiuh  
 bTray=TRUE; WkP +r9rT  
} DIaYo4  
~>Kq<]3~  
void CCaptureDlg::DeleteIcon() pu+ur=5&  
{ JN4fPGbV  
 NOTIFYICONDATA data; Tde0~j}  
 data.cbSize=sizeof(NOTIFYICONDATA); !lTda<;]  
 data.hWnd=GetSafeHwnd(); ('C7=u&F  
 data.uID=98; e$e#NoN  
 Shell_NotifyIcon(NIM_DELETE,&data); gd7^3q[$h  
 ShowWindow(SW_SHOW); hIYTe  
 SetForegroundWindow(); }^-<k0A4?  
 ShowWindow(SW_SHOWNORMAL); } fZ`IOf  
 bTray=FALSE; h5"Ov,K3[  
} ibpzeuUl  
Qd &" BEs  
void CCaptureDlg::OnChange() D\1k.tI  
{ \( )# e  
 RegisterHotkey(); [8XLK4e  
} ?kTWpXx"=  
$s\UL}Gc  
BOOL CCaptureDlg::RegisterHotkey() ;@3FF  
{ )JD(`  
 UpdateData(); ;`dh fcU  
 UCHAR mask=0; WG u%7e]  
 UCHAR key=0; ka"337H  
 if(m_bControl) ~rD={&0  
  mask|=4; 8X$LC  
 if(m_bAlt) k |YWOy@D~  
  mask|=2; yClx` S(  
 if(m_bShift) +Qxu$#  
  mask|=1; 71fk.16  
  key=Key_Table[m_Key.GetCurSel()]; m ee$"Y  
 if(bRegistered){ l|/LQ/  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); - nbMTY}  
  bRegistered=FALSE; Km#pX1]>e  
 } *\uM.m0$  
 cMask=mask; K_/zuTy  
 cKey=key; EW<kI+0D  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); e>}}:Ud  
 return bRegistered; \ HZ9S=  
} Q`%R[#  
lrWQOYf2  
  四、小结 FV39QG4b4  
4|?{VQ  
  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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