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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: m~$S]Wf  
  %v)m&VUi%  
  一、实现方法 Fke_ms=I^  
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  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: RxUABF8b  
*.g@6IkAQ  
#pragma data_seg("shareddata") b&iJui"7k  
HHOOK hHook =NULL; //钩子句柄 \9FWH}|  
UINT nHookCount =0; //挂接的程序数目 Y\cQ "9  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ~r%>x  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 HzuB.B<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 83~9Xb=!\  
static int KeyCount =0; LA\)B"{J  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 .LQvjK[N  
#pragma data_seg() @ckOLtxE>  
v J `'x  
  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。 b!do7%]i  
`y%1K|Y=  
  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: T][r'jWQ  
RCCI}ovU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ccCe@1RI  
cKey,UCHAR cMask) R\VM6>SN'S  
{ j4C{yk  
 BOOL bAdded=FALSE; L~Hgf/%5  
 for(int index=0;index<MAX_KEY;index++){ kuEB  
  if(hCallWnd[index]==0){ ZA;VA=)\8  
   hCallWnd[index]=hWnd; 0/Q"~H?%  
   HotKey[index]=cKey; X!'nfN  
   HotKeyMask[index]=cMask; V( /=0H/ F  
   bAdded=TRUE; 4pkTOQq_tQ  
   KeyCount++; P. V #  
   break; qjc8$#zXS  
  } /d/Quro  
 } BkO)hze  
 return bAdded; C{"uz_Gh  
} +|SvJ  
//删除热键 +0)zB;~7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F~qiNV  
{ R3`Rrj Z  
 BOOL bRemoved=FALSE; `%a+LU2  
 for(int index=0;index<MAX_KEY;index++){ F| ib=_)3  
  if(hCallWnd[index]==hWnd){ ww0m1FzX  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^Ko{#qbl/  
    hCallWnd[index]=NULL; 3aK/5)4|B  
    HotKey[index]=0; BAUo`el5  
    HotKeyMask[index]=0; !uno!wUIYd  
    bRemoved=TRUE; `;'fCO!  
    KeyCount--; slV7,4S&!  
    break; y%9Q]7&=  
   } qrq9NPf  
  } P2Or|_z  
 } KR4vcI[4  
 return bRemoved; G\HU%J  
} x>E**a?!L  
X*cf|g  
@C}Hx;f6  
  DLL中的钩子函数如下: rwRb _eIj  
5[1#d\QR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0xNlO9b/  
{ y 8./)W&/  
 BOOL bProcessed=FALSE; TNvE26.(  
 if(HC_ACTION==nCode) Q302!N  
 { I{V1Le4?  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 %s#`i$|z*n  
   switch(wParam) ;~Em,M"o  
   {  8G SO]R  
    case VK_MENU: HJ\CGYmyz  
     MaskBits&=~ALTBIT; 9gz"r  
     break; 0lvX,78G;  
    case VK_CONTROL: VB?mr13}G  
     MaskBits&=~CTRLBIT; +]!`>  
     break; qZ39TTQ*p  
    case VK_SHIFT: JMT?+/Qbu  
     MaskBits&=~SHIFTBIT; kOe~0xoT@u  
     break; .W>8bg'u9  
    default: //judge the key and send message !iOuIYjV  
     break; V r0-/T  
   } D(GAC!|/]  
   for(int index=0;index<MAX_KEY;index++){ r7I,%}k  
    if(hCallWnd[index]==NULL) j&S8x|5  
     continue; 4't@i1Ll(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >VAZ^kgi  
    { \sy;ca)[6g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Z~Mq5#3F  
     bProcessed=TRUE; I)-u)P?2x  
    } LqHeLN  
   } c0H8FF3  
  } ~'4:{xH  
  else if((lParam&0xc000ffff)==1){ //有键按下 >:ZlYZ6sI  
   switch(wParam) Wv   
   { [|sKu#yW  
    case VK_MENU: mQ9%[U,  
     MaskBits|=ALTBIT; \E'Nk$V3  
     break; Efb S*f5  
    case VK_CONTROL: P7Th 94  
     MaskBits|=CTRLBIT; WAj26";M(  
     break; >e4  
    case VK_SHIFT: {d;eZt `  
     MaskBits|=SHIFTBIT; ]c8$%  
     break; n9zS'VU  
    default: //judge the key and send message \w 6%J77  
     break; $Xlyc.8YId  
   } r|Y|u v0  
   for(int index=0;index<MAX_KEY;index++){ GXEOgf#i  
    if(hCallWnd[index]==NULL) /WDz;,X  
     continue; cZRLYOC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y[Gw<1F_  
    { RRD\V3C84  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lA4Bq  
     bProcessed=TRUE; NLJD}{8Ot  
    } n7vLw7  
   } u1 uu_*  
  } Bx&.Tj  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 g~L1e5C]z  
   for(int index=0;index<MAX_KEY;index++){ J! 4l-.-  
    if(hCallWnd[index]==NULL) '_n{+eR74  
     continue; dt"[5;_P`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) VA _O0y2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5L<}u` 0J  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?=<vC  
   } }P$48o VY  
  } uP/WRQ{rW>  
 } &DX9m4,y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #lyvb.;  
} NgKbf vt  
%J `;  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: xDBEs*  
F<?e79},`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I`44}oJ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qYFol# =%  
3zb;q@JV  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: y+RT[*bX5o  
VI%879Z\e  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y2Mti- \  
{ Vgs( feGs  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) JF*JF Ob  
 { O0xL;@rBe  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 x5m .MQ J  
  SaveBmp(); 's$pr#V  
  return FALSE; OwP9=9};  
 } L%a ni}V  
 …… //其它处理及默认处理 k@5,6s:  
} NDB]8C  
-A9 !Y{Z  
Y*``C):K%  
  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。 wLD/#Hfi7  
~(B\X?v  
  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。 p5C sw5  
Sv-}w$  
  二、编程步骤 w\Q3h`.  
a#1LGH7E8  
  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"; qH6DZ|  
h*hV  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; yXNE2K  
]Bs ?  
  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; )BTJs)E  
Cc]s94  
  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; ~}4o=O(  
^h^2='p  
  5、 添加代码,编译运行程序。 Bh*~I_Ta>  
Z`"UT#^SI  
三、程序代码 ,ewg3mYHC&  
}se)=7d8 Z  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL dv%gmUUf}k  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) JBE'B Q@  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ /,5`#Gte_  
#if _MSC_VER > 1000 2 < &-  
#pragma once eEn_aX  
#endif // _MSC_VER > 1000 bm1ngI1oI  
#ifndef __AFXWIN_H__ V#!ypX]AB[  
#error include 'stdafx.h' before including this file for PCH g_] u<8&  
#endif )?pin|_x  
#include "resource.h" // main symbols hzPx8sO  
class CHookApp : public CWinApp 5vY h~|  
{ |.:O$/ Tt[  
 public: )1j~(C)E8  
  CHookApp(); ;ijJ%/  
  // Overrides 5"y p|Yl  
  // ClassWizard generated virtual function overrides svyC(m)'  
  //{{AFX_VIRTUAL(CHookApp) K4n1#]8i  
 public: &tD`~  
  virtual BOOL InitInstance(); ;k7` `  
  virtual int ExitInstance(); ]Vl5v5_  
  //}}AFX_VIRTUAL xbo-~{  
  //{{AFX_MSG(CHookApp) g$dL5N7  
  // NOTE - the ClassWizard will add and remove member functions here. VR_+/,~  
  // DO NOT EDIT what you see in these blocks of generated code ! 7^KQQ([  
  //}}AFX_MSG D5T\X-+]O  
  DECLARE_MESSAGE_MAP() 6FSw_[)  
}; .2 UUU\/5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 2k"a%#H8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /~7H<^}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :c)<B@NqNo  
BOOL InitHotkey(); U3kf$nbV/J  
BOOL UnInit(); FEaf&'G]  
#endif P xpz7He  
Di*+Cz;gK  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. j#&sZ$HQ4  
#include "stdafx.h" 4>Uo0NfL  
#include "hook.h" 4g\a$7 r  
#include <windowsx.h> ]vQo^nOo  
#ifdef _DEBUG Ffj:xZ9rk  
#define new DEBUG_NEW r=L9x/r  
#undef THIS_FILE Q(k$HP  
static char THIS_FILE[] = __FILE__; wc bs-arH  
#endif Cqg}dXn'  
#define MAX_KEY 100 2y_rsu\  
#define CTRLBIT 0x04 (G PJ=r  
#define ALTBIT 0x02 D{'Na5(  
#define SHIFTBIT 0x01 |,dMF2ADc  
#pragma data_seg("shareddata") tt J,rM  
HHOOK hHook =NULL; G:WMocyXI'  
UINT nHookCount =0; K!I]/0L  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey `y YgL@Zt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT dN |w;|M  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey //ZB B,[@  
static int KeyCount =0; tx5_e [  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 308w0eP  
#pragma data_seg() nZ\,ZqV  
HINSTANCE hins; aE#ZTc=  
void VerifyWindow(); Q(]-\L'  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &1Cq+YpI  
//{{AFX_MSG_MAP(CHookApp) K/\#FJno  
// NOTE - the ClassWizard will add and remove mapping macros here. ;xB"D0~,1  
// DO NOT EDIT what you see in these blocks of generated code! :R_{tQ-WG  
//}}AFX_MSG_MAP K:y q^T7  
END_MESSAGE_MAP() j&T/.]dX&  
Vg \-^$  
CHookApp::CHookApp() a _  
{ ~iwEhF   
 // TODO: add construction code here, AF3t#)q  
 // Place all significant initialization in InitInstance JEHV \ =  
} zZ32K@  
oN `tZ;a  
CHookApp theApp; #mkr]K8A4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) w,}}mC)\*  
{ n"FOCcTIs  
 BOOL bProcessed=FALSE; 7vj[ AOq3l  
 if(HC_ACTION==nCode) f6|3| +  
 { &g& &-=7)  
  if((lParam&0xc0000000)==0xc0000000){// Key up =l7LEkR  
   switch(wParam) ( ?/0$DB  
   { TdQ^^{SRp  
    case VK_MENU: LG<lZ9+y  
     MaskBits&=~ALTBIT; 7abq3OK+`  
     break; =r-Wy.a@  
    case VK_CONTROL: 3gabk/  
     MaskBits&=~CTRLBIT; qsk71L  
     break; <q[ *kr  
    case VK_SHIFT: t&P5Zw*B  
     MaskBits&=~SHIFTBIT; ~:t2@z4p  
     break; p\-.DRwT`  
    default: //judge the key and send message oC7#6W:@w  
     break; _ZS<zQ'  
   } t9`NCng 5  
   for(int index=0;index<MAX_KEY;index++){ dhVwS$O )  
    if(hCallWnd[index]==NULL) <}mT[;:"  
     continue; @tj0Ir v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +] 5a(/m.~  
    { _r8AO>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \clWrK  
     bProcessed=TRUE; so8-e  
    } 23OV y^b  
   } \FKIEg+(2  
  } 6op\g].P  
  else if((lParam&0xc000ffff)==1){ //Key down ~IqT >  
   switch(wParam) njq-iU  
   { X4k/7EA  
    case VK_MENU: 2(c#m*Q!b  
     MaskBits|=ALTBIT; i@I%$!cB  
     break; {VNeh  
    case VK_CONTROL: ,3n}*"K  
     MaskBits|=CTRLBIT;  C|lMXp\*  
     break; unX^MPpw  
    case VK_SHIFT: ncA2en?  
     MaskBits|=SHIFTBIT; hT]p8m aRZ  
     break; M^[ jA](a  
    default: //judge the key and send message qt:->yiq+  
     break; `nM4kt7  
   } _$cBI_eA7  
   for(int index=0;index<MAX_KEY;index++) fZ376Z:S$  
   { KJ#c(yb9zR  
    if(hCallWnd[index]==NULL) 8n:D#`K  
     continue; n=>Gu9`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xeH# )QJt  
    { 785iY865  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); r9t{/})A  
     bProcessed=TRUE; 6h,'#|:d  
    } #[xNE C)  
   } C`#N Q*O  
  } .^NV e40O  
  if(!bProcessed){ aLq;a  
   for(int index=0;index<MAX_KEY;index++){ 0=5i\*5 p  
    if(hCallWnd[index]==NULL) ibAA:I,d  
     continue; gU%GM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LtU+w*Gj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wS^-o  
   } v6n(<0:  
  } <'B^z0I,  
 } Bf}_ Jw-=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8xv\Zj+  
} o{hKt?  
G`P+J  
BOOL InitHotkey() ;8v5 qz  
{ 'oEmbk8Hg  
 if(hHook!=NULL){ $+);!?^|:  
  nHookCount++; ie ,{C  
  return TRUE; 950b9Vn&  
 } 2X]\:<[4  
 else B>mQ\Q  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); !I Nr  
  if(hHook!=NULL) M@K[i*e  
   nHookCount++; 5a~1RL  
  return (hHook!=NULL); I|5OCTu  
} \wCL)t.cX  
BOOL UnInit() \*N1i`99  
{ P}I*SV0  
 if(nHookCount>1){ [K KoEZ  
  nHookCount--; `Qhh{  
  return TRUE; p(8\w-6  
 } :Rn9rdX  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 7.t$#fzi  
 if(unhooked==TRUE){ wf4Q}l2,d  
  nHookCount=0; F)IP~BE-k  
  hHook=NULL; Uoe?5Of(*  
 } A^7!+1*K+  
 return unhooked; b2Hpuej  
} d]^i1  
AK!G#ug  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S=2,jPX2r  
{ EGt)tI&  
 BOOL bAdded=FALSE; )?WoL Ejq  
 for(int index=0;index<MAX_KEY;index++){ U_~~PCi  
  if(hCallWnd[index]==0){ WDZi @9X_  
   hCallWnd[index]=hWnd; ]5\vYk  
   HotKey[index]=cKey; x'qgpG}?]  
   HotKeyMask[index]=cMask; )'g vaT  
   bAdded=TRUE; GND[f}  
   KeyCount++; t]ZSo-  
   break; zyr6Tv61U  
  } 9s)oC$\  
 } `jHGNi  
 return bAdded; fjFy$NX&>  
} =jN]ckn  
'zb7:[[7%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]*|K8&jxl  
{ ||4Dtg K  
 BOOL bRemoved=FALSE; j$^]WRt  
 for(int index=0;index<MAX_KEY;index++){ 5ZVTI,4K  
  if(hCallWnd[index]==hWnd){ k.ZfjX"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -{h[W bf  
    hCallWnd[index]=NULL; C0%%@ 2+  
    HotKey[index]=0; UPYM~c+}  
    HotKeyMask[index]=0; bq O"k t  
    bRemoved=TRUE; 1#(1Bs6X  
    KeyCount--; "J#:PfJ%  
    break; -ZB"Yg$l  
   } Exr7vL  
  } "->:6Oe2   
 } B (falmXJ  
 return bRemoved; ||V:',#,W  
} -eMRxa>  
qAS^5|(b[  
void VerifyWindow() Nt8(  
{ D6u>[Z[T  
 for(int i=0;i<MAX_KEY;i++){ .vO.g/o  
  if(hCallWnd!=NULL){ Y"qY@`  
   if(!IsWindow(hCallWnd)){ |@BN+o;`Om  
    hCallWnd=NULL; tp<VOUa  
    HotKey=0; pA'A<|)K0  
    HotKeyMask=0; v(iUo&Ge  
    KeyCount--; sfa'\6=O  
   } qpl5n'qHUc  
  } 3_$eQ`AAA  
 } Ub,unU  
} "}! rM6 h  
F 4/Uu"J:  
BOOL CHookApp::InitInstance() R=PzR;8  
{ ^ne8~ ;Q  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7,TWCVap  
 hins=AfxGetInstanceHandle(); M lFvDy  
 InitHotkey(); jGn^<T\  
 return CWinApp::InitInstance(); nlW&(cH  
} 0,/x#  
&iZYBa  
int CHookApp::ExitInstance() "tM/`:Qp  
{ Be+:-t)  
 VerifyWindow(); \0h/~3  
 UnInit(); kP$g l|  
 return CWinApp::ExitInstance(); 9f,:j  
} YW<2:1A|  
F6p1 VFs  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {%{GZ  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) aTsfl  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ J|-HZ-Wk|J  
#if _MSC_VER > 1000 sFK<:ka  
#pragma once D OeKW  
#endif // _MSC_VER > 1000 cqx1NWlY  
}=a4uCE  
class CCaptureDlg : public CDialog `Ny8u")=  
{ 1 1CJT  
 // Construction s?k[_|)!  
 public: " 44?n <1  
  BOOL bTray; )*h~dx_cm  
  BOOL bRegistered; 9#ft;c  
  BOOL RegisterHotkey(); "ux]kfoT  
  UCHAR cKey; %%6 ('wi  
  UCHAR cMask; Wg^cj:&`u  
  void DeleteIcon(); )/"7$2Aoy  
  void AddIcon(); &F_rg,q&_  
  UINT nCount; x[UO1% _o-  
  void SaveBmp(); u9w&q^0dqG  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Kdu\`c-lB  
  // Dialog Data 8F`  
  //{{AFX_DATA(CCaptureDlg) *K'ej4"u  
  enum { IDD = IDD_CAPTURE_DIALOG };  2p>SB/  
  CComboBox m_Key; Y)}%SP>,  
  BOOL m_bControl; +o]BjgG  
  BOOL m_bAlt; "Q{~Bj~  
  BOOL m_bShift; 4/?}xD|?  
  CString m_Path; &Fjilx'k  
  CString m_Number; 1 ],, Ar5  
  //}}AFX_DATA S7{.liHf  
  // ClassWizard generated virtual function overrides % VpBB  
  //{{AFX_VIRTUAL(CCaptureDlg) nM-SDVFM  
 public: 8"mW!M  
  virtual BOOL PreTranslateMessage(MSG* pMsg); D^55:\4(  
 protected: W"(`n4hi3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J"/z?!)IB  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )C]&ui~1  
  //}}AFX_VIRTUAL Ch"8cl;Fm  
  // Implementation 8? Wxd65)  
 protected: ]fo^43rn{  
  HICON m_hIcon; 8G&+  
  // Generated message map functions 3]n@c?lw  
  //{{AFX_MSG(CCaptureDlg) _`i%9Ad.4  
  virtual BOOL OnInitDialog(); zI_GdQNfN  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); H~ n~5 sF"  
  afx_msg void OnPaint(); D1~x  
  afx_msg HCURSOR OnQueryDragIcon(); aGb. Lh9  
  virtual void OnCancel(); < iI6@X>  
  afx_msg void OnAbout(); ++DQS9b{  
  afx_msg void OnBrowse(); f~nt!$  
  afx_msg void OnChange(); VHr7GAmU  
 //}}AFX_MSG cuaNAJ  
 DECLARE_MESSAGE_MAP() ,Bw)n,  
}; W#I:j: p  
#endif ,M.!z@  
Y{vwOs  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file QM_X2Ho  
#include "stdafx.h" r/hyW6e_  
#include "Capture.h" cO+Xzd;838  
#include "CaptureDlg.h" V< ApHb  
#include <windowsx.h> :dIQV(iW  
#pragma comment(lib,"hook.lib") 'z}M[h K]  
#ifdef _DEBUG 68<Z\WP  
#define new DEBUG_NEW ~X<cG=p~u  
#undef THIS_FILE 7[v@*/W@  
static char THIS_FILE[] = __FILE__; V!77YFen %  
#endif Y%:0|utQC  
#define IDM_SHELL WM_USER+1 5b1uD>,;y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rjHIQC C  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); uk[< 6oxz  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; nIQ&gbfO  
class CAboutDlg : public CDialog kgapTv>q  
{ z<%g #bo  
 public: w&yGYHg  
  CAboutDlg(); Ocwp]Mut&  
  // Dialog Data x2;i< |  
  //{{AFX_DATA(CAboutDlg) .um&6Q=2<  
  enum { IDD = IDD_ABOUTBOX }; ^M"z1B]  
  //}}AFX_DATA 30 [#%_* o  
  // ClassWizard generated virtual function overrides {&=qM!2e  
  //{{AFX_VIRTUAL(CAboutDlg) wp %FM  
 protected: HXfXb ^~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $dh4T";  
  //}}AFX_VIRTUAL *Ht*)l?  
  // Implementation D"XX920$~  
 protected: \!JS7!+  
  //{{AFX_MSG(CAboutDlg) !\-4gr?`!  
  //}}AFX_MSG KU|BT .o8  
  DECLARE_MESSAGE_MAP() 0vuKGjK  
}; r}0C8(oq  
AR~$MCR]"k  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @>fO;*  
{ sCtw30BL  
 //{{AFX_DATA_INIT(CAboutDlg) 7e c0Xh1  
 //}}AFX_DATA_INIT p/k<wCm6  
} poQdI?ed,  
F|?+>c1}  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /pN'K5@  
{ a We Bav}_  
 CDialog::DoDataExchange(pDX); >*= =wlOB  
 //{{AFX_DATA_MAP(CAboutDlg) q)V1{B@  
 //}}AFX_DATA_MAP twtkH~`"Q  
} O5qW*r'  
%x}&=zx0*1  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Y62u%':X  
 //{{AFX_MSG_MAP(CAboutDlg) wY3|#P CDV  
 // No message handlers y=9Dxst"V  
 //}}AFX_MSG_MAP p2x1xv  
END_MESSAGE_MAP() $xA J9_2P  
f(6UL31  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8wX+ZL: 9  
: CDialog(CCaptureDlg::IDD, pParent) yS)- &t!;  
{ w}j6 .r  
 //{{AFX_DATA_INIT(CCaptureDlg) i}`_H^  
  m_bControl = FALSE; cK[R1 ReH  
  m_bAlt = FALSE; B)rr7B  
  m_bShift = FALSE; PW*;Sp  
  m_Path = _T("c:\\"); VX;zZ`BJ  
  m_Number = _T("0 picture captured."); ) \-96 xd  
  nCount=0; B6ed,($&  
  bRegistered=FALSE; g=xv+e  
  bTray=FALSE; au~]  
 //}}AFX_DATA_INIT -VWCD,c  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 =_8 UZk.  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ', sQ/#S  
} t=Z&eKDC  
NtY*sUKRD  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) N.0HfYf  
{ Ht|",1yr+  
 CDialog::DoDataExchange(pDX); /&]-I$G@  
 //{{AFX_DATA_MAP(CCaptureDlg) H DF"]l;  
  DDX_Control(pDX, IDC_KEY, m_Key); 3}B5hht "D  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ADYx.8M|9i  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 8cK\myn.  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); =w ^TcV  
  DDX_Text(pDX, IDC_PATH, m_Path); lf%b0na?r  
  DDX_Text(pDX, IDC_NUMBER, m_Number); s(AJkO'`  
 //}}AFX_DATA_MAP |66m` <  
} fJLf7+q  
#\pP2  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) H(15vlOD  
//{{AFX_MSG_MAP(CCaptureDlg) cy)k<?,  
 ON_WM_SYSCOMMAND() I9}+(6  
 ON_WM_PAINT() :tMre^oP  
 ON_WM_QUERYDRAGICON() R}DX(T,K  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) x.b; +p}=  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $ViojW>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4}Q O!(  
//}}AFX_MSG_MAP 4%wq:y< )/  
END_MESSAGE_MAP() $D QD$  
.pZo(*  
BOOL CCaptureDlg::OnInitDialog() #PPR"w2g  
{ 8jy-z"jc  
 CDialog::OnInitDialog(); e0f":Vct  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >ik1]!j]Lv  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]3L@$`ys  
 CMenu* pSysMenu = GetSystemMenu(FALSE); J3;Tm~KJ_  
 if (pSysMenu != NULL) [_WI8~g Y  
 { g4N%PV8  
  CString strAboutMenu; jHAWK9fa  
  strAboutMenu.LoadString(IDS_ABOUTBOX); s$DGd T)  
  if (!strAboutMenu.IsEmpty()) i2$*}Cu  
  { NW{y% Z  
   pSysMenu->AppendMenu(MF_SEPARATOR); bh6d./  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >0PUWr$8  
  } f.| |PH  
 } LthGZ|>  
 SetIcon(m_hIcon, TRUE); // Set big icon hPa n  
 SetIcon(m_hIcon, FALSE); // Set small icon 0VzXDb>`  
 m_Key.SetCurSel(0); nQ5N=l  
 RegisterHotkey(); 7p)N_cJD  
 CMenu* pMenu=GetSystemMenu(FALSE); Rl_.;?v"!  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8 +"10q-  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /61by$E  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); LGIalf*7  
 return TRUE; // return TRUE unless you set the focus to a control  ispkj'  
} Z'Kd^`mt 9  
7}Bj|]b)~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) {Q)dU-\  
{ ^:qD.h>&  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) NMXnrvS&  
 { hUVk54~l  
  CAboutDlg dlgAbout; i{8]'fM  
  dlgAbout.DoModal(); |~SE"  
 } I>{!U$  
 else {3hqp*xl  
 { 8N% z9b  
  CDialog::OnSysCommand(nID, lParam); 7p^@;@V  
 } Oe/6.h?  
} vQUZVq5M  
%N )e91wC  
void CCaptureDlg::OnPaint()  *p=fi  
{ )ZGYhE  
 if (IsIconic()) e RA7i  
 { )s7bJjT0=X  
  CPaintDC dc(this); // device context for painting 4E2yH6l  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); .eo~?u<j&  
  // Center icon in client rectangle 8O6_iGTBh  
  int cxIcon = GetSystemMetrics(SM_CXICON); YG4WS |  
  int cyIcon = GetSystemMetrics(SM_CYICON); Y %K~w  
  CRect rect; 5C/2b.-[  
  GetClientRect(&rect); LfEvc2 v=g  
  int x = (rect.Width() - cxIcon + 1) / 2; R :"+ #Sq  
  int y = (rect.Height() - cyIcon + 1) / 2; Z!= L   
  // Draw the icon ;)?( 2 wP  
  dc.DrawIcon(x, y, m_hIcon);  EZ<80G  
 } dIk' pA^d  
 else 6 mCq/$  
 { s`"OM^[-  
  CDialog::OnPaint(); wUoiXi09  
 } Q"%QQo}}  
} h3kaD  
CM9XPr  
HCURSOR CCaptureDlg::OnQueryDragIcon() |QVr `tE<  
{ !tU'J"Zy  
 return (HCURSOR) m_hIcon; !6H uFf  
} PL@~Ys0  
iU5P$7.p  
void CCaptureDlg::OnCancel() bDDqaO ,8  
{ zOB !(R  
 if(bTray) pz 7H To;p  
  DeleteIcon(); Kq&qE>Ju  
  CDialog::OnCancel(); Pt)S;6j   
} ~wOTjz  
%:3'4;jh%  
void CCaptureDlg::OnAbout() ?6f7ld5  
{ 9@n diu[  
 CAboutDlg dlg; |jT2W  
 dlg.DoModal(); ~.Cv DJy  
} @RGDhwS47  
CbOCk:,g5  
void CCaptureDlg::OnBrowse() Stxp3\jEn  
{ q\R q!7(  
 CString str; */w7?QOv  
 BROWSEINFO bi; ydQ!4  
 char name[MAX_PATH]; wiJRCH  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); %X>FVlPm  
 bi.hwndOwner=GetSafeHwnd(); w2{g,A|  
 bi.pszDisplayName=name; WULAty  
 bi.lpszTitle="Select folder"; =A@>I0(7  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; qZ*f%L(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); +~Tu0?{Z 0  
 if(idl==NULL) ZIpD{>/  
  return; q8>t!rh<R  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); oQT2S>cm^  
 str.ReleaseBuffer(); B>z?ClH$R  
 m_Path=str; "_< 9PM1t  
 if(str.GetAt(str.GetLength()-1)!='\\') 8[zb{PRu  
  m_Path+="\\"; >;4!O%F  
 UpdateData(FALSE); v vq/  
} p|3b/plZ  
l!?yu]Yon  
void CCaptureDlg::SaveBmp() !`&\Lx_  
{ A1),el-^5  
 CDC dc; T#EFXHPr  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #y 1Bx,  
 CBitmap bm; #DFp[\)1  
 int Width=GetSystemMetrics(SM_CXSCREEN); =gjDCx$|  
 int Height=GetSystemMetrics(SM_CYSCREEN); 53Yxz3v  
 bm.CreateCompatibleBitmap(&dc,Width,Height); I[0!S IqY  
 CDC tdc; M:|8]y@  
 tdc.CreateCompatibleDC(&dc); /=)L_  
 CBitmap*pOld=tdc.SelectObject(&bm); e[1>(l}Ss  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); a460|w6  
 tdc.SelectObject(pOld); c8Z A5|  
 BITMAP btm; Qz,|mo+  
 bm.GetBitmap(&btm); w^q7n  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; gEwd &J  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *geN [ [  
 BITMAPINFOHEADER bih; >&U @f  
 bih.biBitCount=btm.bmBitsPixel; ST Z]8cw  
 bih.biClrImportant=0; m#e*c [*G  
 bih.biClrUsed=0; V`#.7uUP  
 bih.biCompression=0; C\}/"  
 bih.biHeight=btm.bmHeight; 8 #}D : (  
 bih.biPlanes=1; %}3qR~;  
 bih.biSize=sizeof(BITMAPINFOHEADER); 8(f:U@BS  
 bih.biSizeImage=size; 6>`c1 \8f  
 bih.biWidth=btm.bmWidth; +G*JrwJ&=  
 bih.biXPelsPerMeter=0; NHm]`R,  
 bih.biYPelsPerMeter=0; ""% A'TZ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3qaMO#{M  
 static int filecount=0; ''H"^oS  
 CString name; YoKs:e2/:  
 name.Format("pict%04d.bmp",filecount++); $q_R?Eay  
 name=m_Path+name; %m&@o~+  
 BITMAPFILEHEADER bfh; &~~wX,6+  
 bfh.bfReserved1=bfh.bfReserved2=0; &nj&:?w  
 bfh.bfType=((WORD)('M'<< 8)|'B'); }%TPYc  
 bfh.bfSize=54+size; Lrd[O v  
 bfh.bfOffBits=54; /<Ld'J  
 CFile bf; 9GU]l7C=z  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ SA;#aj}rV  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Y?K{(szo ?  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]:ZdV9`  
  bf.WriteHuge(lpData,size); i7*EbaYzUO  
  bf.Close(); #Sh <Ih  
  nCount++; zMi; A6  
 } o}$1Ay*q`  
 GlobalFreePtr(lpData); "=1;0uy]  
 if(nCount==1) o-C#|t3hH  
  m_Number.Format("%d picture captured.",nCount); @7oL#-  
 else lDxc`S  
  m_Number.Format("%d pictures captured.",nCount); m GjN_  
  UpdateData(FALSE); ?r=jF)C<'  
} r(h`XMsU  
aEt/NwgiQ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) %NHkDa!  
{ 2]cRXJ7h  
 if(pMsg -> message == WM_KEYDOWN) NSQp< m  
 { 0Ua%DyJ  
  if(pMsg -> wParam == VK_ESCAPE) >&:NFq-  
   return TRUE; )%d*3\Tsd  
  if(pMsg -> wParam == VK_RETURN) ntVS:F  
   return TRUE; CW&.NT  
 } O%8EZyu  
 return CDialog::PreTranslateMessage(pMsg); u #w29Pm  
} O@V%Cu  
v'!a\b`9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =O).Lx2J  
{ "A$!, PX6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ t. ='/`!N  
  SaveBmp(); #S]ER907  
  return FALSE; qOih`dla  
} ar9]"s+'  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ )3Z ^h<"j  
 CMenu pop; HlvuW(,x=  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); W2FD+ wt  
 CMenu*pMenu=pop.GetSubMenu(0); _tTNG2  
 pMenu->SetDefaultItem(ID_EXITICON); gKYfQ+  
 CPoint pt; %a+mk E  
 GetCursorPos(&pt); ngohtB^]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); anMF-x4/*q  
 if(id==ID_EXITICON) R_XR4)(<  
  DeleteIcon(); ?W^c4NtP  
 else if(id==ID_EXIT) UcOk3{(z$q  
  OnCancel(); KGH/^!u+R  
 return FALSE; y){ k3lm0  
} 1 i[\T  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {8)zg<rL+M  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) t3(]YgF  
 AddIcon(); J &pO%Q=b  
 return res; FCi U  
} .sC?7O =  
(8.Z..PH  
void CCaptureDlg::AddIcon() .qMOGbd?  
{ 3b'QLfU&#  
 NOTIFYICONDATA data; m< _S_c  
 data.cbSize=sizeof(NOTIFYICONDATA); 3 @ak<9&  
 CString tip; 'u4<BQVV[  
 tip.LoadString(IDS_ICONTIP); }by;F9&B  
 data.hIcon=GetIcon(0); ^?7`;/  
 data.hWnd=GetSafeHwnd(); ;r_F[E2z  
 strcpy(data.szTip,tip); Dn&D!B  
 data.uCallbackMessage=IDM_SHELL; 8V^oP] Y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =6"2UC&  
 data.uID=98; QUU;g2k  
 Shell_NotifyIcon(NIM_ADD,&data); vVE2m=!v  
 ShowWindow(SW_HIDE); 1N7Kv4,  
 bTray=TRUE; 5?hw !  
} %?e& WLS  
N(I&  
void CCaptureDlg::DeleteIcon() X.hm s?]  
{ vnWWneeNr  
 NOTIFYICONDATA data; 8"sb;  
 data.cbSize=sizeof(NOTIFYICONDATA); uwz)($~bp  
 data.hWnd=GetSafeHwnd(); kY*rb_2j  
 data.uID=98; }VS5gxI1.  
 Shell_NotifyIcon(NIM_DELETE,&data); K+;e4_\  
 ShowWindow(SW_SHOW); q#<^^4U  
 SetForegroundWindow(); 0 stc9_O  
 ShowWindow(SW_SHOWNORMAL); JSW^dw&  
 bTray=FALSE; |B?27PD  
} Re P|UH  
X!e[GJ  
void CCaptureDlg::OnChange() N[<\>Ps|u  
{ 6d_'4B  
 RegisterHotkey(); yzqVz_Fi*W  
} H&:jcgV*P  
{ ^cV lC_  
BOOL CCaptureDlg::RegisterHotkey() S H!  
{ ZosP(Tdq  
 UpdateData(); gb H<]?  
 UCHAR mask=0; -$\+' \  
 UCHAR key=0; $0 vb^  
 if(m_bControl) 6 J{k(H$3  
  mask|=4; zT!drq:x  
 if(m_bAlt) W[Ls|<Q  
  mask|=2; {phNds%  
 if(m_bShift) q WQ/ 'M  
  mask|=1; 0g+'/+Ho 4  
  key=Key_Table[m_Key.GetCurSel()]; q@[Qj Gj@  
 if(bRegistered){ Y;?{|  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); S:h{2{  
  bRegistered=FALSE; xai*CY@cQ  
 } .Y&)4+ckL  
 cMask=mask; : Zlwp6  
 cKey=key; ;M)QwF1  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); z6*X%6,8  
 return bRegistered; r"P|dlV-  
} FoN|i"*l  
 R}O_[  
  四、小结 $<}$DH_Y  
tfj:@Z5&$C  
  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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