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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: 3e[k9`  
  RvW>kATb_F  
  一、实现方法 [o'}R`5)  
V6<Ki  
  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: |qk%UN<  
YkV-]%c  
#pragma data_seg("shareddata") zpcm`z  
HHOOK hHook =NULL; //钩子句柄 WtSlD9 h  
UINT nHookCount =0; //挂接的程序数目 =2wy;@f  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 atFu KYI  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 vCR\lR+  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey d #-<=6  
static int KeyCount =0; 3TD!3p8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 B gG+  
#pragma data_seg() k|^nrjStC  
Ks7kaX  
  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。 Lop=._W  
iQaFR@  
  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*`%7{+  
=>h~<88#5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR K[|d7e  
cKey,UCHAR cMask) U#_rcu  
{ F9SIC7}uH  
 BOOL bAdded=FALSE; b+}*@xhl  
 for(int index=0;index<MAX_KEY;index++){ HaamLu  
  if(hCallWnd[index]==0){ jZY9Lx8o  
   hCallWnd[index]=hWnd; <$;fOp  
   HotKey[index]=cKey; `Tf<w+H  
   HotKeyMask[index]=cMask; i`:r2kU:*W  
   bAdded=TRUE; \+w -{"u$  
   KeyCount++; 1z(y>`ZBq  
   break; ?G-a:'1!6  
  } mE]W#?   
 } j&?NE1D>I  
 return bAdded; dkf?lmC+M  
} 5G=CvGu  
//删除热键 V# 6`PD6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) o'  DXd[y  
{ Z-j%``I?h  
 BOOL bRemoved=FALSE; 0)qLW& w  
 for(int index=0;index<MAX_KEY;index++){ g<{W\VOPm  
  if(hCallWnd[index]==hWnd){ !'C^qrh  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ S,v9\wN.  
    hCallWnd[index]=NULL; 'm"H*f  
    HotKey[index]=0; r,b-c  
    HotKeyMask[index]=0; 2S8/ lsB  
    bRemoved=TRUE; .,x08M  
    KeyCount--; 'u.`!w '|L  
    break; B: uW(E  
   } UeT"v?zP  
  } ^f1}:g  
 } TO)wjF_  
 return bRemoved; Nr7MSFiL  
} ,[^P  
?Zoq|Q+  
58MBG&a%  
  DLL中的钩子函数如下: (85F1"Jp  
}EO n=*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) GYv2 ^IB:  
{ @v2kAOw[  
 BOOL bProcessed=FALSE; J2H8r 'T  
 if(HC_ACTION==nCode) z0Gh |N@)  
 { D x Vt  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 W?/7PVGv5h  
   switch(wParam)  c:~o e  
   {  ipKkz  
    case VK_MENU: OY`G_=6!N  
     MaskBits&=~ALTBIT; e v?Hz8Q;(  
     break; Tj*zlb4  
    case VK_CONTROL: hgKs[ySo,3  
     MaskBits&=~CTRLBIT; Cl>'K*$F  
     break; ^#%$?w>wI  
    case VK_SHIFT: ZwF_hm=/[  
     MaskBits&=~SHIFTBIT; fwxyZBr  
     break; '(u[  
    default: //judge the key and send message |2c'0Ibu  
     break; zYSXG-k  
   } ]Wv\$JXI  
   for(int index=0;index<MAX_KEY;index++){ m2<sVTN`^  
    if(hCallWnd[index]==NULL) /1tqTi  
     continue; ybf`7KEP2A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /k}v m3  
    { R0\E?9P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &&(sZG w  
     bProcessed=TRUE; |'=R`@w~0  
    } d%4!d_I<  
   } <(@m913|  
  } WRFzb0;01  
  else if((lParam&0xc000ffff)==1){ //有键按下  nKkI  
   switch(wParam) 1"~@UcJ  
   { (h|l$OL/  
    case VK_MENU: MWsBZJRr  
     MaskBits|=ALTBIT; P",~8Aci(  
     break; 01#a  
    case VK_CONTROL: `N8A{8$qv  
     MaskBits|=CTRLBIT; -Vt*(L  
     break; ,T jd  
    case VK_SHIFT: i+T$&$b  
     MaskBits|=SHIFTBIT; 0P\)L`cG  
     break; +lU:I  
    default: //judge the key and send message z+NXD4  
     break; -~v;'zOO  
   } f#/v^Ql*  
   for(int index=0;index<MAX_KEY;index++){ Ry[VEn>C1  
    if(hCallWnd[index]==NULL) .v0.wG  
     continue; SAc}5.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y-@K@Zu]?  
    { }N*6xr*X+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (PE"_80Z  
     bProcessed=TRUE; >j_,3{eJ  
    } #: w/vk  
   } 'X"@C;q  
  } 4)*8&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 6|rqsk  
   for(int index=0;index<MAX_KEY;index++){ UP 75}h9  
    if(hCallWnd[index]==NULL) O:q 0-  
     continue; 0^5SL/2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (p-a;.Twj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); iO,0Sb <y  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ;Q:^|Fw!F  
   } C5\bnk{  
  } |\*7J!Liv  
 } Q: [d   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A+69_?B TH  
} $A9!} `V  
{Fta4D_1N  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: M4XnuFGB[w  
SVpvx`&kT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a9(1 6k  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w6'o<=  
89Svx5S  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: UsNr$MO {  
l=`)yc.  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u7UqN  
{ $C##S@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) cYF R.~p  
 { 8*;G\$+  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 gEcVQPD@  
  SaveBmp(); L~cswG'K  
  return FALSE; kZs  
 } {:$0j|zL1  
 …… //其它处理及默认处理 7]_UZ)u  
} =3?t%l;n  
`zAV#   
y, tA~  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 w;vp X>  
.7ESPr  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 8)&H=#E  
C"PN3>x}j  
  二、编程步骤 6A7UW7/  
7uFM)b@.P  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; LyhLPU0^q  
Xw!eB?A  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; j wlmWO6  
%@'9<i8o  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; M@UkXA}  
Ih!UL:Ckh  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ={ c=8G8T  
Z`v6DfK}  
  5、 添加代码,编译运行程序。 O?L _9L*  
ZalG/PFy  
三、程序代码 Z%\9y]zs  
i >Hh_q;'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ~j" aJ /  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) i)Vqvb0Q  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ }UMg ph:2:  
#if _MSC_VER > 1000 ,Ej2]iO\7  
#pragma once P.$U6cq  
#endif // _MSC_VER > 1000 x-:vpv%6y  
#ifndef __AFXWIN_H__ %gSqc }v*  
#error include 'stdafx.h' before including this file for PCH ndT:,"s  
#endif 3}= .7qm  
#include "resource.h" // main symbols 2x{@19w)C  
class CHookApp : public CWinApp .*:SZ3v  
{ *E+2E^B  
 public: ~;_]U[eOL  
  CHookApp(); }>b4s!k,  
  // Overrides QbP W_)N  
  // ClassWizard generated virtual function overrides n9]^v-]K  
  //{{AFX_VIRTUAL(CHookApp) s+(%N8B  
 public: 5)' _3r  
  virtual BOOL InitInstance(); F8Z<JcOI  
  virtual int ExitInstance(); w5gN8ZF3  
  //}}AFX_VIRTUAL -Cd4yWkO  
  //{{AFX_MSG(CHookApp) iN8?~T}w  
  // NOTE - the ClassWizard will add and remove member functions here. LO[1xE9  
  // DO NOT EDIT what you see in these blocks of generated code ! v Q[{<|K  
  //}}AFX_MSG }oigZI(1  
  DECLARE_MESSAGE_MAP() e &^BPzg  
}; xr&wV0O '  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); v:B_%-GfOA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q -M&f@Il  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Vo+d3  
BOOL InitHotkey(); .3?'+KZ,  
BOOL UnInit(); \=Af AO@  
#endif D@uw[;Xb5  
tPPnW  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Msn)jh  
#include "stdafx.h" Hj |~*kG  
#include "hook.h" bW;0E%_  
#include <windowsx.h> Q-F'-@`(C  
#ifdef _DEBUG </t_<I0{  
#define new DEBUG_NEW J_}&Btb)e  
#undef THIS_FILE ogs9obbZ!  
static char THIS_FILE[] = __FILE__; (aVs p*E  
#endif VD/Wl2DK  
#define MAX_KEY 100 ?Pw# !t  
#define CTRLBIT 0x04 c=I!?a"  
#define ALTBIT 0x02 L$zT`1Hy  
#define SHIFTBIT 0x01 J9)wt ?%j  
#pragma data_seg("shareddata") 4U<'3~RN  
HHOOK hHook =NULL; AJ2Xq*fk  
UINT nHookCount =0;  4D"IAI  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey #j d?ocoY  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &YO5N4X~o  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey -kZz,pNQ,  
static int KeyCount =0; |(}uagfrd  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift LnZ*,>1 Z  
#pragma data_seg() L'6_~I  
HINSTANCE hins; W0tBF&E"  
void VerifyWindow(); \-GV8A2:k  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) H|0B*i@81  
//{{AFX_MSG_MAP(CHookApp) *u>2"!+Ob  
// NOTE - the ClassWizard will add and remove mapping macros here. UL; d H  
// DO NOT EDIT what you see in these blocks of generated code! l6xC'c,jg  
//}}AFX_MSG_MAP C+P}R]cT"  
END_MESSAGE_MAP() 86/CA[Y-  
\>cZ=  
CHookApp::CHookApp() wC!(STu  
{ J4j?rLR3p  
 // TODO: add construction code here, N TXT0:  
 // Place all significant initialization in InitInstance U'";  
} BS*cG>T  
-ud~'<k  
CHookApp theApp; 1kio.9NIp  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $7TYix8=  
{ .{7?Y;_(  
 BOOL bProcessed=FALSE; F5:*;E;$  
 if(HC_ACTION==nCode) |1g2\5Re  
 { -5p=gO  
  if((lParam&0xc0000000)==0xc0000000){// Key up #$jAGt3^BT  
   switch(wParam) uAzV a!)  
   { @ )<uQ S  
    case VK_MENU: +/\.%S/  
     MaskBits&=~ALTBIT; }-zx4<4BH  
     break; iA^w2K  
    case VK_CONTROL: lxbbyy25  
     MaskBits&=~CTRLBIT; QV{Nq=%]  
     break; lqX]'gu]\  
    case VK_SHIFT: FX}<F0([?  
     MaskBits&=~SHIFTBIT; wH|\;M{0V1  
     break; m\1*/6oV  
    default: //judge the key and send message xhUQ.(S`r6  
     break; GgA =EdJn  
   } S31 :}   
   for(int index=0;index<MAX_KEY;index++){ `*}#Bks!  
    if(hCallWnd[index]==NULL) J'@ I!Jc  
     continue; 5? c4aAn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) OMKEn!Wq  
    { WgE~H)_%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]lz,?izMR  
     bProcessed=TRUE; EHzU`('?[  
    } JFYeOmR+l  
   } WpTC,~-  
  } s4~c>voQB  
  else if((lParam&0xc000ffff)==1){ //Key down Kwh3SU=L}  
   switch(wParam) 3XL0Pm  
   { ~e%*hZNo  
    case VK_MENU: f$2lq4P{  
     MaskBits|=ALTBIT; gkBat(Uc  
     break; Lb2Bu>  
    case VK_CONTROL: ?[XH`c,  
     MaskBits|=CTRLBIT; mT!~;] RrF  
     break; [W^6=7EO  
    case VK_SHIFT: QZh8l-!#5  
     MaskBits|=SHIFTBIT; :&_@U$  
     break; r\Man'h$  
    default: //judge the key and send message <&H.pN1_  
     break; 0Fbq/63  
   } nHZ 4):`  
   for(int index=0;index<MAX_KEY;index++) >Pv%E  
   { YJ3970c/M  
    if(hCallWnd[index]==NULL) q/4PX  
     continue; |nm,5gPNC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &m Y<e4  
    { .' X$SF`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =q6yb@  
     bProcessed=TRUE; (/qY*?  
    } BJW;A>@Pj  
   } t`F%$q  
  } f3yZx!K_Br  
  if(!bProcessed){ F'SOl*v(s5  
   for(int index=0;index<MAX_KEY;index++){ Dhef|E<  
    if(hCallWnd[index]==NULL) `^_.E:f  
     continue; hKX-]+6"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [dt1%DD`M  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8(g:i#~  
   } ->93.sge  
  } *B3` #t  
 } bZtjg  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @8/-^Rh*  
}  Y9PG  
RQe#X6'h  
BOOL InitHotkey() 2Db[dk( ]  
{ -.z~u/uL  
 if(hHook!=NULL){  : [AW  
  nHookCount++; <Pf W  
  return TRUE; N2~DxVJ5cT  
 } Dk[[f<H_{  
 else >L=l{F6 p  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); qU=$ 0M  
  if(hHook!=NULL) g{a_{P  
   nHookCount++; iCw~4KG  
  return (hHook!=NULL); 53l9s <bOQ  
} w/Q'T&>b/  
BOOL UnInit() d3Y#_!)  
{ ux-Fvwoh  
 if(nHookCount>1){ .;$/nz6vk  
  nHookCount--; .Olq_wuH  
  return TRUE; vH7"tz&RIp  
 } ot,<iE#za  
 BOOL unhooked = UnhookWindowsHookEx(hHook); GS)l{bS#[O  
 if(unhooked==TRUE){ * =r,V  
  nHookCount=0; SJ+.i u/  
  hHook=NULL; Zx`hutCv  
 } ZM4q@O)/  
 return unhooked; =zI eZ7  
} ~W`upx)j  
xJZbax[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IURi90Ir  
{ "4L' 2w+  
 BOOL bAdded=FALSE; u^V`Ucd"R  
 for(int index=0;index<MAX_KEY;index++){ .eJ4F-V  
  if(hCallWnd[index]==0){ 7G2TTa  
   hCallWnd[index]=hWnd; X"'}1o  
   HotKey[index]=cKey; Oja)J-QXb  
   HotKeyMask[index]=cMask; i}M&1E  
   bAdded=TRUE; ^$yr-p%-  
   KeyCount++; ,D~C40f  
   break; Vk>aU3\c  
  } .qF@ }dO  
 } 8[}MXMRdb  
 return bAdded; ,?i#NN5p  
} 5/Swn9vwl  
N6yqA)z?;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Fc42TH p  
{ k,b(MAiQ0  
 BOOL bRemoved=FALSE; H}JH339  
 for(int index=0;index<MAX_KEY;index++){ &*L:4By)]  
  if(hCallWnd[index]==hWnd){ CWt,cwFW  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^K&& O {  
    hCallWnd[index]=NULL; Z\O ,9  
    HotKey[index]=0; `^(6{p ?  
    HotKeyMask[index]=0; j}S  
    bRemoved=TRUE; Y@RPQPmIQ  
    KeyCount--; {"'W!WT b  
    break; Qh)@-r3  
   } S 8h/AW6l  
  } /3rt]h"  
 } y&9v0&o  
 return bRemoved; Bn47O~  
} `h :&H,N  
N$?mula  
void VerifyWindow() -4Y}Y5 9\  
{ \w O)w@"  
 for(int i=0;i<MAX_KEY;i++){ MdZ7Yep  
  if(hCallWnd!=NULL){ >RE&>T^8  
   if(!IsWindow(hCallWnd)){ |~rDEv3  
    hCallWnd=NULL; LK/gG6n5M0  
    HotKey=0; 6Z|/M6f  
    HotKeyMask=0; }j9V0`Q  
    KeyCount--; !@j5yYf  
   } >Wvb!8N  
  } + q@kRQY;n  
 } $}kT )+K  
} 0G@sj7)]  
-;rr! cQ?  
BOOL CHookApp::InitInstance() Xi vzhI4  
{ B+W 4r9#  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); o9&&u1`M/  
 hins=AfxGetInstanceHandle(); rm}OVL  
 InitHotkey(); ]7W !  
 return CWinApp::InitInstance(); , H$1iJ?  
} c~j")o  
#{97<sU\  
int CHookApp::ExitInstance() ;.Dm?J0  
{ 6\9 Zc-%  
 VerifyWindow(); ()Tl\  
 UnInit(); -[h2fqu1  
 return CWinApp::ExitInstance(); PG51+#  
} Q sXy(w#F  
?h$ =]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file rAv)k&l  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) )U2cS\k'7n  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ y}\d]*5  
#if _MSC_VER > 1000 vO?\u`vY  
#pragma once 7I#<w[l>k  
#endif // _MSC_VER > 1000 6 h?v/\  
B IW?/^  
class CCaptureDlg : public CDialog Ba8 s  
{ r bfIH":  
 // Construction o(gEyK  
 public: k=^~\$e  
  BOOL bTray; 6d# 7  
  BOOL bRegistered; \me'B {aa  
  BOOL RegisterHotkey(); # $N)  
  UCHAR cKey; Y<ZaW{%  
  UCHAR cMask; 7o99@K,  
  void DeleteIcon(); ],W/IDv  
  void AddIcon(); S;I>W&U  
  UINT nCount; ><HHO (74X  
  void SaveBmp(); ji&%'h  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor {:%A  
  // Dialog Data )<~v~|re  
  //{{AFX_DATA(CCaptureDlg) C"gH>G  
  enum { IDD = IDD_CAPTURE_DIALOG }; MEI.wJZ  
  CComboBox m_Key; >V,i7v*?  
  BOOL m_bControl; U+4W9zhwo  
  BOOL m_bAlt; I{8sLzA03S  
  BOOL m_bShift; ~d9@m#_T#~  
  CString m_Path; o8ERU($/  
  CString m_Number; =>0 G  
  //}}AFX_DATA f|r +qe  
  // ClassWizard generated virtual function overrides 5bZjW~d  
  //{{AFX_VIRTUAL(CCaptureDlg) us,~<e0  
 public: ,,Ia4c  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @p\te7(P%  
 protected: Py! F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [ U`})  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 4Px  
  //}}AFX_VIRTUAL lMW4SRk1C  
  // Implementation [T>a}}@  
 protected: "JBTsQDj!  
  HICON m_hIcon; 0*umf .R  
  // Generated message map functions [7|j:!  
  //{{AFX_MSG(CCaptureDlg) Btu=MUS  
  virtual BOOL OnInitDialog(); MRZ/%OZ.  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); n>["h2  
  afx_msg void OnPaint(); 7Ew.6!s#n1  
  afx_msg HCURSOR OnQueryDragIcon(); A=a~ [vre  
  virtual void OnCancel(); yD n8{uI  
  afx_msg void OnAbout(); 6~b]RZe7  
  afx_msg void OnBrowse(); di,?`  
  afx_msg void OnChange(); !v`C-1}70  
 //}}AFX_MSG b( qO fek  
 DECLARE_MESSAGE_MAP() !/|^ )d^U  
}; <xpHlLc  
#endif Bx&F*a;5  
~3F\7%Iqc  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file z')zV oW,  
#include "stdafx.h" ]0yYMnqvr  
#include "Capture.h" LG6k KG  
#include "CaptureDlg.h" UvPD/qu$8D  
#include <windowsx.h> 7HkQ|~zGT  
#pragma comment(lib,"hook.lib") Il&}4#:  
#ifdef _DEBUG <Z6tRf;B  
#define new DEBUG_NEW ""2g{!~r  
#undef THIS_FILE 5/{";k)L+  
static char THIS_FILE[] = __FILE__; ['l.]k-b}  
#endif _/iw=-T  
#define IDM_SHELL WM_USER+1 Gd08RW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1FO T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); QoVRZ$!p  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^twJNm{99  
class CAboutDlg : public CDialog =cN! h"C[  
{ d|, B* N(w  
 public: on=I*?+R  
  CAboutDlg(); zJJ6"9sl  
  // Dialog Data <m|\#Jw_V  
  //{{AFX_DATA(CAboutDlg) J/o$\8tiMw  
  enum { IDD = IDD_ABOUTBOX }; xQetAYP`  
  //}}AFX_DATA G L> u3K  
  // ClassWizard generated virtual function overrides ,%a7sk<5k  
  //{{AFX_VIRTUAL(CAboutDlg) },=0]tvZG#  
 protected: s?2DLXv}!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1p[Z`m*9  
  //}}AFX_VIRTUAL @/ m|T]'8  
  // Implementation 7w U$P  
 protected: 1`X- O>  
  //{{AFX_MSG(CAboutDlg) S _B $-H|  
  //}}AFX_MSG UOg4 E  
  DECLARE_MESSAGE_MAP() W?B(Jsv  
}; ca!=D $  
Q6|~ks+Y  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,z1fiq  
{ # XD-a  
 //{{AFX_DATA_INIT(CAboutDlg) c&o|I4|Y,  
 //}}AFX_DATA_INIT :Gdfpz-{?  
} a V4p0s6ZZ  
rU {E}  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) DjX*2O  
{ 8jnz;;|  
 CDialog::DoDataExchange(pDX); +cw;a]o^>  
 //{{AFX_DATA_MAP(CAboutDlg) ( _{\tgSm  
 //}}AFX_DATA_MAP g`skmHS89  
} ZN:~etd  
&$vW  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) `Xbk2KD p  
 //{{AFX_MSG_MAP(CAboutDlg) 1f"LAs`%  
 // No message handlers qQ_o>+3VAy  
 //}}AFX_MSG_MAP 'e3[m  
END_MESSAGE_MAP() j|u6TG  
6L~tUe.G  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !*?Ss  
: CDialog(CCaptureDlg::IDD, pParent) 9\|n2$H:  
{ S'I{'jP5  
 //{{AFX_DATA_INIT(CCaptureDlg) SX{6L(  
  m_bControl = FALSE; H nRd  
  m_bAlt = FALSE; Ng6(2Wt0e  
  m_bShift = FALSE; ' Vp6=,P  
  m_Path = _T("c:\\"); K,>D%mJ  
  m_Number = _T("0 picture captured."); (L)tC*Qjc  
  nCount=0; !zw)! rV=  
  bRegistered=FALSE; .Jt&6N  
  bTray=FALSE; LN8V&'>  
 //}}AFX_DATA_INIT {I!sXj  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32  !,*#e  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); p2|BbC\N  
} {-sy,EYcw  
0;Y|Ua[G+~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) iB Ld*B|#K  
{ o,!r t1&0  
 CDialog::DoDataExchange(pDX); }ST9&w i~  
 //{{AFX_DATA_MAP(CCaptureDlg) HR85!S`  
  DDX_Control(pDX, IDC_KEY, m_Key); }ug|&25D  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); hCX}*  
  DDX_Check(pDX, IDC_ALT, m_bAlt); oEHUb?(p  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Z#wmEc.}C  
  DDX_Text(pDX, IDC_PATH, m_Path); '"H'#%RU  
  DDX_Text(pDX, IDC_NUMBER, m_Number); eCY gi7?  
 //}}AFX_DATA_MAP > Xq:?}-m2  
} cS98%@DR  
H)$-T1Wx4  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) PrIS L[@  
//{{AFX_MSG_MAP(CCaptureDlg) $1N_qu  
 ON_WM_SYSCOMMAND() ':71;^zXf  
 ON_WM_PAINT() &Bbs\ ;  
 ON_WM_QUERYDRAGICON() Q(-:)3g[aL  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 3A_7R-sQ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T jO}P\p  
 ON_BN_CLICKED(ID_CHANGE, OnChange) =N,Mmz%  
//}}AFX_MSG_MAP TxYxB1C)  
END_MESSAGE_MAP() ) MFa~/x  
k`W.tMo  
BOOL CCaptureDlg::OnInitDialog() Mg.xGST  
{ goi5I(yn^  
 CDialog::OnInitDialog(); tI&Z!fj  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @|xcrEnP}B  
 ASSERT(IDM_ABOUTBOX < 0xF000); lvi~GZ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); (5%OAjW  
 if (pSysMenu != NULL) vcsi @!   
 { e,qc7BJzK  
  CString strAboutMenu; KaC+x-%K  
  strAboutMenu.LoadString(IDS_ABOUTBOX); zE +)oQ,  
  if (!strAboutMenu.IsEmpty()) Zqke8q  
  { m!s/L,iJJ  
   pSysMenu->AppendMenu(MF_SEPARATOR); d Z+7S`{  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ")fgQ3XZ  
  } vJW`aN1<I3  
 } 4&6cDig7*2  
 SetIcon(m_hIcon, TRUE); // Set big icon 9mpQusM  
 SetIcon(m_hIcon, FALSE); // Set small icon dO-Zj#%7z8  
 m_Key.SetCurSel(0); ADMeOdgca  
 RegisterHotkey(); *6v5JH&K  
 CMenu* pMenu=GetSystemMenu(FALSE); `"$9L[>  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )F0Q2P1I  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); XW{cC`&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ZV07;`I  
 return TRUE; // return TRUE unless you set the focus to a control TI8E W  
} rPHM_fW(O@  
`EiL~*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !Z;Nv  
{ <F| S<\Y.  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ikPr>  
 {  ~"h V-3U  
  CAboutDlg dlgAbout; gOaK7A  
  dlgAbout.DoModal(); >Q)S-4iR  
 } ;47=x1j i  
 else 86o'3G9@  
 { >rFM8P(  
  CDialog::OnSysCommand(nID, lParam); =e6!U5 f  
 } <*p  
} tTJ$tx  
L_IvR 4:j~  
void CCaptureDlg::OnPaint() ]oC7{OoX  
{ D6EqJ,~  
 if (IsIconic()) y!\q ', F  
 { +ZRm1q   
  CPaintDC dc(this); // device context for painting 1mx;b)4t  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6 %T_;"hb  
  // Center icon in client rectangle o6r ^  
  int cxIcon = GetSystemMetrics(SM_CXICON); oMN Qv%U  
  int cyIcon = GetSystemMetrics(SM_CYICON); /IC]}0kkp  
  CRect rect; 4o@^._-R  
  GetClientRect(&rect); `iwGPG!  
  int x = (rect.Width() - cxIcon + 1) / 2; AE%zqvp>  
  int y = (rect.Height() - cyIcon + 1) / 2; ~@iYP/=/Q  
  // Draw the icon Uz7V2r%]  
  dc.DrawIcon(x, y, m_hIcon); m9aP]I3g]\  
 } zM'2opiUY  
 else  PO=A^b  
 { cHwN=mg]S  
  CDialog::OnPaint(); Q!W+vh  
 } Uql7s:!,U  
} SwhArvS  
W-vEh  
HCURSOR CCaptureDlg::OnQueryDragIcon() <*$IZl6I  
{ vLM-v  
 return (HCURSOR) m_hIcon; cA+O]",}  
} U9q6m3#$  
/I q6'oo  
void CCaptureDlg::OnCancel() b#_u.vP  
{ %>:d5"&Lbs  
 if(bTray) z%L\EP;o}  
  DeleteIcon(); u[coWaPsZ  
  CDialog::OnCancel(); }Ym~[S*x  
} p87VJ}  
 xXZ {  
void CCaptureDlg::OnAbout() Dad*6;+N  
{ }9(:W</}  
 CAboutDlg dlg; /;r k-I  
 dlg.DoModal(); EX,)MU  
} #5W-*?H  
rfc;   
void CCaptureDlg::OnBrowse() WiclG8l  
{ R9V v*F]m@  
 CString str; a`uHkRX )U  
 BROWSEINFO bi; C<\O;-nHH  
 char name[MAX_PATH]; (8OaXif  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); \^rAH@  
 bi.hwndOwner=GetSafeHwnd(); iKuSk~  
 bi.pszDisplayName=name; MzO4Yv"A  
 bi.lpszTitle="Select folder"; Dz>v;%$S-  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 4F>?G{ci  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); R} aHo0r  
 if(idl==NULL) Q[N6#C:(4  
  return; &B5@\Hd;  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); EBPm7{&0|  
 str.ReleaseBuffer(); f_GqJ7Gk]  
 m_Path=str; .ahYj n  
 if(str.GetAt(str.GetLength()-1)!='\\') 5n'C6q "  
  m_Path+="\\"; Jd>"g9  
 UpdateData(FALSE); F2$Z4%x#  
} o Z#4<7K  
7 -hSso.'  
void CCaptureDlg::SaveBmp() hE"a(i  
{ ngoAFb  
 CDC dc; LE:nmo  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); F&om^G'U  
 CBitmap bm; &\, ZtaB  
 int Width=GetSystemMetrics(SM_CXSCREEN); P}+-))J  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5ZkMd !$y  
 bm.CreateCompatibleBitmap(&dc,Width,Height); =c,m)\u/8  
 CDC tdc; wZA(><\  
 tdc.CreateCompatibleDC(&dc); g&30@D"  
 CBitmap*pOld=tdc.SelectObject(&bm); tOK lCc  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;nbUbRb  
 tdc.SelectObject(pOld); jJF(*D  
 BITMAP btm; /~Q2SrYH  
 bm.GetBitmap(&btm); gUoTOA,  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; $(ugnnJ*  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (&U8NeWZ  
 BITMAPINFOHEADER bih; N| dwuBW  
 bih.biBitCount=btm.bmBitsPixel; a0oM KGW:  
 bih.biClrImportant=0; N!}r(Dd*  
 bih.biClrUsed=0; )o<rU[oD]C  
 bih.biCompression=0; d&x1uso%L  
 bih.biHeight=btm.bmHeight; pbe" w=<  
 bih.biPlanes=1; ]$'w8<D>t,  
 bih.biSize=sizeof(BITMAPINFOHEADER); 09{B6l6P  
 bih.biSizeImage=size; Gmi w(T  
 bih.biWidth=btm.bmWidth; BiQ7r=Dd.  
 bih.biXPelsPerMeter=0; b NBpt}$  
 bih.biYPelsPerMeter=0; (q!tI* }  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); c:Tw.WA  
 static int filecount=0; ]C =+  
 CString name; S"iz fQ@  
 name.Format("pict%04d.bmp",filecount++); xe;1D'(   
 name=m_Path+name; [WDtr8L  
 BITMAPFILEHEADER bfh; YY (,H!  
 bfh.bfReserved1=bfh.bfReserved2=0; |RBgJkS;8  
 bfh.bfType=((WORD)('M'<< 8)|'B'); s5X .(;+  
 bfh.bfSize=54+size; ceDe!Iu  
 bfh.bfOffBits=54; C ebl"3Q  
 CFile bf; wD-(3ZVd4  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ URq{#,~CT  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); z}vgp\cuT  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); X0Q};,  
  bf.WriteHuge(lpData,size); D=U"L-rRs  
  bf.Close(); oe$Y=`  
  nCount++; Zb)j2Xgl  
 } xeqAFq=9?  
 GlobalFreePtr(lpData); Nj Ng=q  
 if(nCount==1) ^ 1rw\Zp  
  m_Number.Format("%d picture captured.",nCount); tl|Qw";I  
 else `2S G{5o;  
  m_Number.Format("%d pictures captured.",nCount); L3^WI( 8m  
  UpdateData(FALSE); Y]ML-smN  
} :zk69P3  
fHek!Jv.  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Y4]USU!PA  
{ W8:?y*6  
 if(pMsg -> message == WM_KEYDOWN) `}/&}Sp  
 { lLy^@s  
  if(pMsg -> wParam == VK_ESCAPE) #F\}PCBe'  
   return TRUE; -I7"9}j3  
  if(pMsg -> wParam == VK_RETURN) =k#SQ/@  
   return TRUE; f!;4 -.p`  
 } &D, gKT~  
 return CDialog::PreTranslateMessage(pMsg); %zx=rn(K  
} qy1$(3t$  
KlbL<9P >  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &]gw[ `  
{ TY[{)aH{S  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G<9UL*HU  
  SaveBmp(); 2 fp\s5%J}  
  return FALSE; n5i#GvO^  
} "Gx(-NH+  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ y>T:fu  
 CMenu pop; 0\f3La  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Z)cGe1?q  
 CMenu*pMenu=pop.GetSubMenu(0); ]r;-Lx{F  
 pMenu->SetDefaultItem(ID_EXITICON); 5tMp@$F\{[  
 CPoint pt; HE0UcP1U  
 GetCursorPos(&pt); SXn\k;F<  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); c`w YQUg(  
 if(id==ID_EXITICON) 5 3=zHYQ  
  DeleteIcon(); Td%[ -  
 else if(id==ID_EXIT) t(FI Bf3  
  OnCancel(); aW-'Jg=@H^  
 return FALSE; tPh``o  
} I%]L  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); jRP.Je@t  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0`:B#ten  
 AddIcon(); Tl9KL%9  
 return res; ]Z?$ 5Ks  
} _]W {)=ap  
A;E7~qOG  
void CCaptureDlg::AddIcon() GmoY~}cg~  
{ |V#h "s  
 NOTIFYICONDATA data; cTf/B=yMi  
 data.cbSize=sizeof(NOTIFYICONDATA); hawE2k0p(  
 CString tip; .\1{>A  
 tip.LoadString(IDS_ICONTIP); A%S6&!I:(  
 data.hIcon=GetIcon(0); ?0HPd5=<v  
 data.hWnd=GetSafeHwnd(); l n}2   
 strcpy(data.szTip,tip); C"w>U   
 data.uCallbackMessage=IDM_SHELL; qI,4 uGg  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; lTOO`g  
 data.uID=98; .s7Cr0^k,|  
 Shell_NotifyIcon(NIM_ADD,&data); ^|KX)g  
 ShowWindow(SW_HIDE); ~$7fU  
 bTray=TRUE; M5DW!^  
} G  @ib  
595P04  
void CCaptureDlg::DeleteIcon() gKK*` L~  
{ -DgJkyt+<  
 NOTIFYICONDATA data;  w+<`>  
 data.cbSize=sizeof(NOTIFYICONDATA); @?,iy?BSG  
 data.hWnd=GetSafeHwnd(); IN2FO/Y@  
 data.uID=98; Aa^%_5  
 Shell_NotifyIcon(NIM_DELETE,&data); 1muB* O  
 ShowWindow(SW_SHOW); 0&!,+  
 SetForegroundWindow(); [43:E*\$  
 ShowWindow(SW_SHOWNORMAL); mouLjT&p  
 bTray=FALSE; +[$d9  
} U2  0@B`<  
cTW3\S=  
void CCaptureDlg::OnChange() f>d aK9$(  
{ l*;Isz:  
 RegisterHotkey(); /Q Xq<NG  
} hiKgV|ZD  
R~nbJx$  
BOOL CCaptureDlg::RegisterHotkey() uZ}=x3B  
{ u;$g1 3  
 UpdateData(); |7G +O+j  
 UCHAR mask=0; 5(F @KeH>  
 UCHAR key=0; a`XXz  
 if(m_bControl) 1p#O(o  
  mask|=4; Qo7]fnnaV  
 if(m_bAlt) Qs(WyP#  
  mask|=2; P{qi>FJqe  
 if(m_bShift) . e' vc  
  mask|=1; 7}+U;0,)  
  key=Key_Table[m_Key.GetCurSel()]; Sl@$  
 if(bRegistered){ zqqu7.`  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); d^5OB8t  
  bRegistered=FALSE; G,+-}~$_  
 } 7]}n 0*fe  
 cMask=mask; .<Y7,9;YEF  
 cKey=key; [se J'Io  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); y%* hHnGd  
 return bRegistered; "YY6_qQR'  
} e !_+TyI  
-[\+~aDH,  
  四、小结 )HPt(Ck  
?f{{{0$S  
  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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