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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: {i{xo2<1"  
  KpZ:Nh$  
  一、实现方法 pJpNO$$w  
[`fI:ao|  
  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: Ibr%d2yS=  
$ACx*e%  
#pragma data_seg("shareddata") w; TkkDH  
HHOOK hHook =NULL; //钩子句柄 3 pWM~(#>-  
UINT nHookCount =0; //挂接的程序数目 f|3q^wjs  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5a`%)K  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 dz9Y}\2tf  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Qc-(*}  
static int KeyCount =0; ".2K9j7$  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 lvSdY(8  
#pragma data_seg() L^Wz vv]  
@uleyB  
  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。 Nud,\mXrY[  
|w&~g9   
  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: mX# "+X|  
LgqGVh3\s  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR $n=lsDnhQ  
cKey,UCHAR cMask) )$M,Ul  
{ Un=a fX?j  
 BOOL bAdded=FALSE; 1JS2SxF  
 for(int index=0;index<MAX_KEY;index++){ y=N"=Z  
  if(hCallWnd[index]==0){ ,{}#8r`+*  
   hCallWnd[index]=hWnd; =yi OJyx  
   HotKey[index]=cKey; sa-9$},z4  
   HotKeyMask[index]=cMask; ETw]! br  
   bAdded=TRUE;  mw$Y  
   KeyCount++; >9K//co"of  
   break; 6 vs3O  
  } }p3b#fAr  
 } eD#XDK  
 return bAdded; HMQI&Lh=U  
} v"lf-c  
//删除热键 UsW5d]i}Y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P~7.sM  
{ `iixq9xi  
 BOOL bRemoved=FALSE; 'imU `zeo  
 for(int index=0;index<MAX_KEY;index++){ HCnf2td  
  if(hCallWnd[index]==hWnd){ aq>?vti1D  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~1 ZD[@  
    hCallWnd[index]=NULL; 8n)WW$  
    HotKey[index]=0; Zr/r2  
    HotKeyMask[index]=0; 5~VosUp e7  
    bRemoved=TRUE; RXSf,O  
    KeyCount--; DguB  
    break; Jbw!:x [  
   } POd/+e9d  
  } $Xf(^K  
 } f6ZZ}lwaV  
 return bRemoved; F'W> 8  
} &r_uQbx  
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ExhL[1E  
  DLL中的钩子函数如下: +<(a}6dt  
HYClm|   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :=!Mh}i  
{ ;iX<`re~  
 BOOL bProcessed=FALSE; %v=!'?VT  
 if(HC_ACTION==nCode) *g7DPN$aQ  
 { ,x#ztdvr  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;sQbn|=e"  
   switch(wParam) Lo`F  
   {  $G";2(-k  
    case VK_MENU: ,b.n{91[]x  
     MaskBits&=~ALTBIT; WmVVR>0V|  
     break; l)Mh2lA,=  
    case VK_CONTROL: tbG8MXX  
     MaskBits&=~CTRLBIT; 0s%6n5>  
     break; uw_?O[ZA[  
    case VK_SHIFT: &L3 #:jSk  
     MaskBits&=~SHIFTBIT; "'{OIP  
     break; UxqWnHH.`  
    default: //judge the key and send message ^Q2ZqAf^a  
     break; ?!S GiARW?  
   } Rc9<^g`  
   for(int index=0;index<MAX_KEY;index++){ #+G`!<7/@f  
    if(hCallWnd[index]==NULL) r%-n*_?.s  
     continue; xs1bxJ_R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n2'|.y}Um:  
    { sR79 K1*j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >]/dOH,A  
     bProcessed=TRUE; b(&] >z  
    } I'A:J  
   } %V_eJC""?  
  } >d%VDjk .  
  else if((lParam&0xc000ffff)==1){ //有键按下 0xP:9rm  
   switch(wParam) ] 09yy  
   { # "r kuDO  
    case VK_MENU: ,cQA*;6  
     MaskBits|=ALTBIT; \(u@F<s-  
     break; # #>a&,  
    case VK_CONTROL: ,"H?hFQ  
     MaskBits|=CTRLBIT; <!!nI%NC  
     break; r$DZkMue  
    case VK_SHIFT: aL)$b  
     MaskBits|=SHIFTBIT; x5vzPh`  
     break; uBRw>"c_*8  
    default: //judge the key and send message 6/7F">@j  
     break; _3&/(B%H  
   } %EIUAG  
   for(int index=0;index<MAX_KEY;index++){ $rB!Ex{@ac  
    if(hCallWnd[index]==NULL) 8p,>y(o  
     continue; $jcz?vH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y:9?P~  
    { Rp4FXR jC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  ;MZbL)  
     bProcessed=TRUE; D pNX66O  
    } _LsYMUe  
   } L9J;8+ge  
  } gvr]]}h:O  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .+uVgSN  
   for(int index=0;index<MAX_KEY;index++){ j4vB`Gr]  
    if(hCallWnd[index]==NULL) J/[7d?hI/  
     continue; .b~OMTHuvM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *h])mqhB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?o>6S EGW  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 k(9s+0qe  
   } [oJ& J>U'  
  } JU2P%3  
 } VO|u8Z"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P2QRvn6v  
} ir+8:./6  
NYwGK|  
  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: w(#:PsMo<  
GZ,j?@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )u Qvt-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ChVY Vx(  
i6A$1(:h  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: oVreP  
e sGlMq  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) oFn4%S:  
{ n4R]+&*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) b<\GI 7  
 { M;PlSb  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ~QO< B2hS}  
  SaveBmp(); . Nk6  
  return FALSE; *V<)p%l.  
 } 3l+|&q[v  
 …… //其它处理及默认处理 0@w&J9yG  
} =xoBC&u  
 HFv?s  
u{pTva  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 YpiRF+G  
J]\s*,C&  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 flPZlL  
DbQBVy  
  二、编程步骤 WQTendS  
63SVIc~wT  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; V"BVvSNu  
uiuTv)pwF  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; -$b?rt]h1g  
eA10xpM0  
  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; 03] r*\  
x6jm -n  
  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; 35}P0+  
JqQ3C}z  
  5、 添加代码,编译运行程序。 a0)vvo=bz  
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三、程序代码 tRkrV]K  
zK,~37)\  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "wF*O"WQo  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ag<4r  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ c.\:peDk  
#if _MSC_VER > 1000 svF*@(- P#  
#pragma once EJv!tyJ\[  
#endif // _MSC_VER > 1000 ;+r0 O0;9  
#ifndef __AFXWIN_H__ rrbZ+*U  
#error include 'stdafx.h' before including this file for PCH Re7{[*Q4  
#endif +6uOg,;  
#include "resource.h" // main symbols }@3$)L%n_u  
class CHookApp : public CWinApp :^K~t!@  
{ 1RmBtx\<  
 public: dPRtN@3  
  CHookApp(); z=u~]:.1O  
  // Overrides ^NcTWbs-T  
  // ClassWizard generated virtual function overrides $`ON!,oa  
  //{{AFX_VIRTUAL(CHookApp) B>R* f C@g  
 public: 20n%o&kG]8  
  virtual BOOL InitInstance(); oUCS |  
  virtual int ExitInstance(); sek6+#|=  
  //}}AFX_VIRTUAL h!ZZ2[  
  //{{AFX_MSG(CHookApp) ER/\ +Z#Z  
  // NOTE - the ClassWizard will add and remove member functions here. B>1M$3`E  
  // DO NOT EDIT what you see in these blocks of generated code ! 0H; "5  
  //}}AFX_MSG R,uJK)m  
  DECLARE_MESSAGE_MAP() >Zi|$@7t-  
}; K~P76jAe$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); HE9. k.sS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "MW55OWYU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1LV|t+Sex  
BOOL InitHotkey(); "tpvENz2s  
BOOL UnInit(); * .oi3m  
#endif \%Pma8&d  
R%Kl&c  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. t!NrB X  
#include "stdafx.h" (q055y  
#include "hook.h" k&n\ =tKN  
#include <windowsx.h> 4U_rB9K$  
#ifdef _DEBUG 1 OuSH+  
#define new DEBUG_NEW ~Ay  
#undef THIS_FILE ER0TY,  
static char THIS_FILE[] = __FILE__; I #Arr#%  
#endif f:)]FHPB1  
#define MAX_KEY 100 IO?~b XP  
#define CTRLBIT 0x04 B(HNB\3u  
#define ALTBIT 0x02 +# m   
#define SHIFTBIT 0x01 J+-,^8)  
#pragma data_seg("shareddata") ZS07_6.~  
HHOOK hHook =NULL; Y;~EcM  
UINT nHookCount =0; 89 _&X[X  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey jFI]54,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ,Gf+U7'K  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey bvt-leA=  
static int KeyCount =0; &1\u#LU  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift p?EEox  
#pragma data_seg() {FrHm  
HINSTANCE hins; %t,1_c0w  
void VerifyWindow(); $6qR/#74  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) rElG7[+)p  
//{{AFX_MSG_MAP(CHookApp) lk5_s@V l  
// NOTE - the ClassWizard will add and remove mapping macros here. \J#I}-a&j  
// DO NOT EDIT what you see in these blocks of generated code! 6EW"8RG`  
//}}AFX_MSG_MAP + xkMW%e<  
END_MESSAGE_MAP() ~cWLu5  
|qFN~!  
CHookApp::CHookApp() -M(58/y  
{ ePFC$kMn  
 // TODO: add construction code here, "'LOaf$X  
 // Place all significant initialization in InitInstance [bQ8A(u  
} (5CX*)R  
DY%T`}  
CHookApp theApp;  Wl}G[>P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #oS  
{ LQuYCfj|  
 BOOL bProcessed=FALSE; 0.3[=a4 3  
 if(HC_ACTION==nCode) 8DmX4*  
 { s`dkEaS  
  if((lParam&0xc0000000)==0xc0000000){// Key up m''iE  
   switch(wParam) FZLzu  
   { }sm56}_  
    case VK_MENU: A*?/F:E  
     MaskBits&=~ALTBIT; n Y.Umj  
     break; 2R~=@  
    case VK_CONTROL: m78MWz]Yo  
     MaskBits&=~CTRLBIT; .,(uoK{  
     break; YQw/[  
    case VK_SHIFT: #6#BSZ E  
     MaskBits&=~SHIFTBIT; 7kew/8-  
     break; 7~k~S>sO  
    default: //judge the key and send message %)!~t8To  
     break; `dq3=  
   } 2+hfbFu,1  
   for(int index=0;index<MAX_KEY;index++){ qhHRR/p  
    if(hCallWnd[index]==NULL) Y_TL4  
     continue; DdA}A>47  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f1,$<Y|qU  
    { lQ(BEv"2G[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "Ezr-4  
     bProcessed=TRUE; L@x8hUG"  
    } lyc{Z%!3  
   } x%Y a*T  
  } #+5mpDh  
  else if((lParam&0xc000ffff)==1){ //Key down WSX@0A.&)  
   switch(wParam) &?ed.V@E5  
   { Z6 |'k:R8  
    case VK_MENU: K^1O =1gY  
     MaskBits|=ALTBIT; 6 GevO3  
     break; DcvmeGl  
    case VK_CONTROL: R<YYf^y  
     MaskBits|=CTRLBIT; `EW_pwZPA  
     break; )@&?i.  
    case VK_SHIFT: QR-R5XNT[  
     MaskBits|=SHIFTBIT; kl<B*:RqH  
     break; {UVm0AeUq  
    default: //judge the key and send message 7)5$1  
     break; }R] }@i~i  
   } JV*,!5  
   for(int index=0;index<MAX_KEY;index++) lDM~Z3(/b  
   { "a_D]D(d5  
    if(hCallWnd[index]==NULL) i1H80m s  
     continue; F/,<dNJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;<ma K*f\S  
    { d+| ! 6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +!Gr`&w*)  
     bProcessed=TRUE; \:)o'-   
    } >"My\o  
   } !/lY q;$R  
  } o_^d>Klb8  
  if(!bProcessed){ C36.UZoc  
   for(int index=0;index<MAX_KEY;index++){ aGkVC*T  
    if(hCallWnd[index]==NULL) 1H@rNam&  
     continue; 4Xho0lO&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wjGjVTtHs  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); HC`3AQ12!&  
   } ,(Hmk(,  
  } !`Yi{}1_  
 } 9Q5P7}%p  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Nk~dfY<s  
} wN0OAbtX'  
zNTu j p  
BOOL InitHotkey() .L|ax).D  
{ >+LgJo R  
 if(hHook!=NULL){ wuCtg=  
  nHookCount++; =id $  
  return TRUE; 3B|-xq;]I  
 } cNB$g )`  
 else $Lbe5d?\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 8q LgB  
  if(hHook!=NULL) )h!l%72  
   nHookCount++; ZUI\0qh+  
  return (hHook!=NULL); QKkr~?sTO  
} p?NjxQLA  
BOOL UnInit() L/+J|_J)  
{ ,^Srd20  
 if(nHookCount>1){ 7%FZXsD  
  nHookCount--; e9~4wt  
  return TRUE; >43yty\   
 } NS~knR\&  
 BOOL unhooked = UnhookWindowsHookEx(hHook); RL)3k8pk  
 if(unhooked==TRUE){ UN4) >\Y  
  nHookCount=0; 491I  
  hHook=NULL; T/6=A$4 #  
 } P&^7wud-sb  
 return unhooked; U: jf9L2  
} y5D?Bg|M  
Oo .Qz   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9 (.9l\h  
{ L=FvLii.  
 BOOL bAdded=FALSE; |;-r};  
 for(int index=0;index<MAX_KEY;index++){ JB_`lefW,'  
  if(hCallWnd[index]==0){ j7+t@DqQ  
   hCallWnd[index]=hWnd; !QspmCo+  
   HotKey[index]=cKey; GLF"`M/g  
   HotKeyMask[index]=cMask; Y6PA\7Y\  
   bAdded=TRUE; Y"%o\DS*  
   KeyCount++; rB?cm]G=  
   break; ,LO-!\L  
  } mcG$V0D <{  
 } % "^XxVJ*  
 return bAdded; 9?c^~77  
} xB+H7Ya  
.p}Kl$K]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v |2j~  
{ 34:EpZO@  
 BOOL bRemoved=FALSE; <]^D({`  
 for(int index=0;index<MAX_KEY;index++){ ;VRR=p%,  
  if(hCallWnd[index]==hWnd){ elB 8   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lHqx}n@e  
    hCallWnd[index]=NULL; 0z#kV}wE  
    HotKey[index]=0; mkA|gM[g7  
    HotKeyMask[index]=0; 1z:N$O _v  
    bRemoved=TRUE; ;P~S/j[ 8  
    KeyCount--; wm71,R1  
    break; dhkpkt<G8  
   } R*m" '|U  
  } oy: MM  
 } EPRs%(w`  
 return bRemoved; j56 An6g  
} 7k|(5P;  
+Bfi/>  
void VerifyWindow() |hoZ:  
{ I|z#Aoc  
 for(int i=0;i<MAX_KEY;i++){ {Z.@-Tl_  
  if(hCallWnd!=NULL){ ,eCXT=6  
   if(!IsWindow(hCallWnd)){ 5 ZPUY  
    hCallWnd=NULL; {[ *_HAy7  
    HotKey=0; >,Z{wxz J  
    HotKeyMask=0; U^\~{X  
    KeyCount--; y@_?3m7B=  
   } 2s%M,Nb  
  } GGtrH~zx  
 } ze)K-6SKH  
} [hbp#I~*[  
{m:R v&T  
BOOL CHookApp::InitInstance() e~?]F 0/  
{ 0B/a$NC  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 06 s3 b  
 hins=AfxGetInstanceHandle(); g<%-n,  
 InitHotkey(); ?UDO%`X  
 return CWinApp::InitInstance(); )A=g# D#  
} ':4pH#E  
ypo=y/!  
int CHookApp::ExitInstance() U{(07GNm#  
{ aS G2K0  
 VerifyWindow(); ts>}>}@vc  
 UnInit(); ulJYJ+CC!  
 return CWinApp::ExitInstance(); e]h'  
} tb3fz")UC  
d.o FlT  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file I xBO$ 2  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n4y6Ua9m{  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %;$Y|RbmqE  
#if _MSC_VER > 1000 _B FX5ifK  
#pragma once Y3>\;W*?  
#endif // _MSC_VER > 1000 # HYkzjb  
?GU!ke p  
class CCaptureDlg : public CDialog %nF\tVP3]  
{ ! -@!u   
 // Construction C/ VYu-p%  
 public: Q@VnJ,  
  BOOL bTray; 5N<v'6&=  
  BOOL bRegistered; j],.`Y  
  BOOL RegisterHotkey(); {`CWzk?  
  UCHAR cKey; ~')t1Ay s  
  UCHAR cMask; #!# X3j  
  void DeleteIcon(); 5V8C+k)  
  void AddIcon(); @rE )xco  
  UINT nCount; ?I#hrv@  
  void SaveBmp(); 2!?z%s-S  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Y_hRL&u3W  
  // Dialog Data } /3pC a  
  //{{AFX_DATA(CCaptureDlg) KXCmCn  
  enum { IDD = IDD_CAPTURE_DIALOG }; G$uOk?R#5c  
  CComboBox m_Key; kA=~ 8N  
  BOOL m_bControl; l0xFt ~l  
  BOOL m_bAlt; fO!O" D5  
  BOOL m_bShift; k|Yv8+XT  
  CString m_Path; AeCG2!8^0  
  CString m_Number; RXS|-_$  
  //}}AFX_DATA &dDI*v+  
  // ClassWizard generated virtual function overrides _s-HlE?C  
  //{{AFX_VIRTUAL(CCaptureDlg) ;=\5$J9  
 public: aevG<|qP  
  virtual BOOL PreTranslateMessage(MSG* pMsg); f"<@6Axq  
 protected: GKujDx+h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6aZt4Lw2\  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [^}>AC*im  
  //}}AFX_VIRTUAL & Yf#O*  
  // Implementation .>64h H  
 protected: ]{2{:`s  
  HICON m_hIcon; xD= qU  
  // Generated message map functions 2]aZe4H.  
  //{{AFX_MSG(CCaptureDlg) p@7i=hyt`p  
  virtual BOOL OnInitDialog(); Ma=6kX]  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); PUjoi@]  
  afx_msg void OnPaint(); n &\'Hm  
  afx_msg HCURSOR OnQueryDragIcon(); Z~phOv  
  virtual void OnCancel(); kuj1 2  
  afx_msg void OnAbout(); Q^MXiE O+  
  afx_msg void OnBrowse(); xV>iL(?  
  afx_msg void OnChange(); PVD ~W)0m*  
 //}}AFX_MSG AXh3LA  
 DECLARE_MESSAGE_MAP() H MjeGO.i  
}; q 5v?`c  
#endif Ue g N-n  
]oas  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file FSU%?PxO  
#include "stdafx.h" Q%n{*py  
#include "Capture.h" $D/bU lFx  
#include "CaptureDlg.h" /y9J)lx  
#include <windowsx.h> b%[ nB  
#pragma comment(lib,"hook.lib") lLkmcHu  
#ifdef _DEBUG NlF0\+h  
#define new DEBUG_NEW P!FEh'.  
#undef THIS_FILE G !1~i*P$u  
static char THIS_FILE[] = __FILE__; ."IJmv  
#endif s^g.42?u  
#define IDM_SHELL WM_USER+1 [*9YIjn  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gv#c~cX]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -3G 4vRIo  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; .|-l+   
class CAboutDlg : public CDialog hg?j)jl|  
{ b.R!2]T]i^  
 public: SLdN.4idK  
  CAboutDlg(); Hbjb7Y?[  
  // Dialog Data crJ7pe9  
  //{{AFX_DATA(CAboutDlg) f2O*8^^Y{Q  
  enum { IDD = IDD_ABOUTBOX }; zNV!@Yr  
  //}}AFX_DATA z/Ns5  
  // ClassWizard generated virtual function overrides W,HH *!  
  //{{AFX_VIRTUAL(CAboutDlg) \K?(  
 protected: c Pq Dsl3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &c!j`86y*  
  //}}AFX_VIRTUAL %@lV-(5q  
  // Implementation 'dIX=/RZ  
 protected: EjR_-8@FK  
  //{{AFX_MSG(CAboutDlg) 3XeXzPj  
  //}}AFX_MSG \~@[QGKN  
  DECLARE_MESSAGE_MAP() rU=b?D)n!w  
}; .KLm39j(  
-?< Ww{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) MAqLIf<G  
{ o%[U  
 //{{AFX_DATA_INIT(CAboutDlg) Q$ri=uB;+  
 //}}AFX_DATA_INIT y,=du  
} )4R:)-"f  
A5fwAB  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) T@[!A);  
{ [mUBHYD7OI  
 CDialog::DoDataExchange(pDX); ar.AL'  
 //{{AFX_DATA_MAP(CAboutDlg) mM/i^zT  
 //}}AFX_DATA_MAP Lq (ZcEKo  
} ZDx@^P y  
Xf d*D  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) FJNF%a)x2I  
 //{{AFX_MSG_MAP(CAboutDlg) Bfr'Zdw  
 // No message handlers I]nHbghcW  
 //}}AFX_MSG_MAP 8]4U`\k4  
END_MESSAGE_MAP() {-|{xBd  
Xc"&0v%;#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [aI]y =v  
: CDialog(CCaptureDlg::IDD, pParent) PP:(EN1  
{ pfu1 O6R  
 //{{AFX_DATA_INIT(CCaptureDlg) 1+-_s  
  m_bControl = FALSE; +xc'1id@[  
  m_bAlt = FALSE; 7eWk7&Xul  
  m_bShift = FALSE; Mu'8;9_6  
  m_Path = _T("c:\\"); pdJ/&ufh  
  m_Number = _T("0 picture captured."); ;nC.fBu  
  nCount=0; *(PL _/:  
  bRegistered=FALSE; :qChMU|Y6  
  bTray=FALSE; d*)CT?d&  
 //}}AFX_DATA_INIT yQ#:J9HMJ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ={LMdC~5X  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); moP,B~  
} ` PYJ^I0  
f2,jh}4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) >pU:Gr  
{ *@d&5  
 CDialog::DoDataExchange(pDX); >``MR%E:<  
 //{{AFX_DATA_MAP(CCaptureDlg) ~QvqG{bFB  
  DDX_Control(pDX, IDC_KEY, m_Key); "\0v,!@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 6#IU*  
  DDX_Check(pDX, IDC_ALT, m_bAlt); /axIIfx-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ui(^k $  
  DDX_Text(pDX, IDC_PATH, m_Path); %Y!Yvw^&P(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); )M__ t5L  
 //}}AFX_DATA_MAP OKF tl  
} z<B8mB  
r5!/[_l  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) aW!@f[%~F  
//{{AFX_MSG_MAP(CCaptureDlg) _`64gS}^  
 ON_WM_SYSCOMMAND() !"8fdSfg w  
 ON_WM_PAINT() gJ2>(k03y  
 ON_WM_QUERYDRAGICON() l NQcYv  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) sP^R/z|Y  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) [s&$l G!  
 ON_BN_CLICKED(ID_CHANGE, OnChange) V+I|1{@i0  
//}}AFX_MSG_MAP t |~YEQ  
END_MESSAGE_MAP() o.q/O)'V u  
:n /@z4#  
BOOL CCaptureDlg::OnInitDialog() |&Ym@Jyj  
{ 6252N]*  
 CDialog::OnInitDialog(); Qg6 W5Hc  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); SM`w;?L:?  
 ASSERT(IDM_ABOUTBOX < 0xF000); _/wV;h~R  
 CMenu* pSysMenu = GetSystemMenu(FALSE); < yC  
 if (pSysMenu != NULL) 5uxBK"q  
 { /z BxJT0  
  CString strAboutMenu; rXA*NeA3v  
  strAboutMenu.LoadString(IDS_ABOUTBOX); vDH>H^9Y  
  if (!strAboutMenu.IsEmpty()) qhT@;W/X  
  { 7O, U?p  
   pSysMenu->AppendMenu(MF_SEPARATOR); 61xs%kxb..  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); rk)##)  
  } Q>n|^y6  
 } MNSbtT*^  
 SetIcon(m_hIcon, TRUE); // Set big icon |=&cQRY!p  
 SetIcon(m_hIcon, FALSE); // Set small icon %;.;>Y(-  
 m_Key.SetCurSel(0); ?JL:CBvCp  
 RegisterHotkey(); C -iK$/U  
 CMenu* pMenu=GetSystemMenu(FALSE); /="~gq@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {dmj/6Lc  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); uL[.ND2._&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ei rzYt  
 return TRUE; // return TRUE unless you set the focus to a control YJo["Q  
} phgm0D7  
a AB`G3  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \.3D~2cU  
{ tQylT0'[+o  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~I} &V T  
 { ObiT-D?)g  
  CAboutDlg dlgAbout; g]c6& Y,#  
  dlgAbout.DoModal(); {\(L%\sV@  
 } ]GRWnif  
 else 3.qTLga|}  
 { lg b?)=  
  CDialog::OnSysCommand(nID, lParam); }6@pJ G  
 } $k2*[sn,  
} tuhA 9}E  
M`l.t -ut  
void CCaptureDlg::OnPaint() *q1%IJ  
{ rW0FA  
 if (IsIconic()) 'UYR5Y>  
 { IhA*"  
  CPaintDC dc(this); // device context for painting (e[}/hf6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8:/e GM  
  // Center icon in client rectangle /IM#.v  
  int cxIcon = GetSystemMetrics(SM_CXICON); ,j$Vvz   
  int cyIcon = GetSystemMetrics(SM_CYICON); QV&D l_  
  CRect rect; 67VT\f  
  GetClientRect(&rect); di>cMS 4 c  
  int x = (rect.Width() - cxIcon + 1) / 2; FTeu~<KpM  
  int y = (rect.Height() - cyIcon + 1) / 2; <&:=z?30"  
  // Draw the icon ^*fxR]Y  
  dc.DrawIcon(x, y, m_hIcon); QQV~?iW{~  
 } P';?YV0  
 else xu'yVt9RC  
 { e@ \p0(  
  CDialog::OnPaint(); Jzp#bgq}|  
 } u3o#{~E/#  
} `Ps:d^8*P  
bk\yCt06y;  
HCURSOR CCaptureDlg::OnQueryDragIcon() NmSo4Dg`U  
{ ?K3(D;5 &i  
 return (HCURSOR) m_hIcon; zrU{@z$l  
} <fs2fTUeqF  
%bdjBa}  
void CCaptureDlg::OnCancel() dzkw$m^@^  
{ YXI'gn2b#  
 if(bTray) -@Uqz781  
  DeleteIcon(); &RTX6%'KY  
  CDialog::OnCancel(); A|@_}h"WG  
} %DQhM,c@  
;-Jb1"5  
void CCaptureDlg::OnAbout() c?%(Dp E  
{ =dx1/4bZl|  
 CAboutDlg dlg; 9Fr3pRIJ  
 dlg.DoModal(); Wy%s1iu  
} y7|P-3[ 4w  
0{j&6I2  
void CCaptureDlg::OnBrowse() 1DA1N<'  
{ {Ions~cO)  
 CString str; kMsnW}Nu  
 BROWSEINFO bi; G!XIc>F*  
 char name[MAX_PATH]; 2m~V{mUT!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 0JD~M\-!^a  
 bi.hwndOwner=GetSafeHwnd(); Kn?lHH*w7  
 bi.pszDisplayName=name; -!\fpl{  
 bi.lpszTitle="Select folder"; )nd\7|5#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @l0|*lo%  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); -D^}S"'  
 if(idl==NULL) Kb^>-[Yx  
  return; >[1W:KQA  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9Mgq1Z  
 str.ReleaseBuffer(); :F?x)"WoQ+  
 m_Path=str; $8crN$ye  
 if(str.GetAt(str.GetLength()-1)!='\\') fkSwD(  
  m_Path+="\\"; . ]8E7  
 UpdateData(FALSE); $:of=WTY(  
} @;?T~^nGj  
W k}AmC  
void CCaptureDlg::SaveBmp() W#Qmv^StZ  
{ SZ_V^UX_  
 CDC dc; uZi.HG{<)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); <s@-:;9~  
 CBitmap bm; ,2]X}&{i  
 int Width=GetSystemMetrics(SM_CXSCREEN); Vj!rT <@  
 int Height=GetSystemMetrics(SM_CYSCREEN); zW8*EE+,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Cbs5dn(Y  
 CDC tdc; Cb:gH}j  
 tdc.CreateCompatibleDC(&dc); cUO<.  
 CBitmap*pOld=tdc.SelectObject(&bm); /(8a~f&%r  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); > MG>=A  
 tdc.SelectObject(pOld); .6~`Ubr}E  
 BITMAP btm; j:bgR8 %e  
 bm.GetBitmap(&btm); D.%B$Y;G  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; "<i SZ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =\t /u  
 BITMAPINFOHEADER bih; {5|("0[F  
 bih.biBitCount=btm.bmBitsPixel; 7}_!  
 bih.biClrImportant=0; ]P[%Mhg^  
 bih.biClrUsed=0; *U#m+@\0  
 bih.biCompression=0; T$= 4O9G  
 bih.biHeight=btm.bmHeight; Ay{t254/  
 bih.biPlanes=1; q_Lo3|t i  
 bih.biSize=sizeof(BITMAPINFOHEADER); ; "3+YTtp  
 bih.biSizeImage=size; mceG!@t  
 bih.biWidth=btm.bmWidth; OJ4SbI  
 bih.biXPelsPerMeter=0; W@\ (nfD2  
 bih.biYPelsPerMeter=0; OJb*VtZz5R  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Ov82ibp_1  
 static int filecount=0; {0YAzZ7  
 CString name; OVk ~N)  
 name.Format("pict%04d.bmp",filecount++); <f~Fl^^8  
 name=m_Path+name; vf~`eT  
 BITMAPFILEHEADER bfh; c3 &m9zC  
 bfh.bfReserved1=bfh.bfReserved2=0; v0l_w  
 bfh.bfType=((WORD)('M'<< 8)|'B'); =wq;@'U  
 bfh.bfSize=54+size; N6Z{BLZ  
 bfh.bfOffBits=54; ;\%sEcpT  
 CFile bf; &GWkq>  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ rSV gWr8  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); kVDe6},D7  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); f0Hq8qAF;^  
  bf.WriteHuge(lpData,size); vs+ We*8H  
  bf.Close(); H 'D#s;SlR  
  nCount++; 2(hvv-  
 } otoBb^Mz  
 GlobalFreePtr(lpData); M9h<}mh\  
 if(nCount==1) }z8{B3K  
  m_Number.Format("%d picture captured.",nCount); B,w:DX  
 else vP-3j  
  m_Number.Format("%d pictures captured.",nCount); VPdwSW[eM  
  UpdateData(FALSE); @pTD{OW?  
} K* 0 aXr?  
5DmCxg  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)  %zA2%cq<  
{ omXBnzT  
 if(pMsg -> message == WM_KEYDOWN) ) j{WeG7L  
 { %bCcsdK  
  if(pMsg -> wParam == VK_ESCAPE) %KbBH:z05  
   return TRUE; >2]Eaw&W  
  if(pMsg -> wParam == VK_RETURN) * i=?0M4S  
   return TRUE; w{_e"N  
 } +A]&AkTw  
 return CDialog::PreTranslateMessage(pMsg); Z}sG3p  
} d9`3EP)n  
1mT|o_K{ T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8O"x;3I9  
{ kHt!S9r  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &:;/]cwj  
  SaveBmp(); H arFo  
  return FALSE; 3X88x-3  
} DQ}_9?3  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Xa?6#  
 CMenu pop; "6I-]:K-  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); P-E'cb%ub  
 CMenu*pMenu=pop.GetSubMenu(0); h-?q6O/|  
 pMenu->SetDefaultItem(ID_EXITICON); 0I(GB;E  
 CPoint pt; oP|pOs\$p  
 GetCursorPos(&pt); -7Aw s)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); D]G'R5H  
 if(id==ID_EXITICON) ?c=R"Yg$  
  DeleteIcon(); Pv{,aV\I}  
 else if(id==ID_EXIT) Z?.p%*>`T=  
  OnCancel(); *6sJ*lh  
 return FALSE; %U=S6<lbj;  
} ~n8*@9[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); O5G<O(,\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Hg gR=>s  
 AddIcon(); gJcXdv=]2  
 return res; {E3<GeHw4  
} {.' ,%)  
,<^tsCI  
void CCaptureDlg::AddIcon() 4t%:O4 3e  
{ t]u(jX)  
 NOTIFYICONDATA data; 7tf81*e  
 data.cbSize=sizeof(NOTIFYICONDATA); 7(|3 OR+  
 CString tip; bgzT3KZ  
 tip.LoadString(IDS_ICONTIP); '1kj:Np  
 data.hIcon=GetIcon(0); G+ $)W u  
 data.hWnd=GetSafeHwnd(); zP{<0o  
 strcpy(data.szTip,tip); NU)`js  
 data.uCallbackMessage=IDM_SHELL; UuOLv;v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ard3yNQt  
 data.uID=98; vs'L1$L'c  
 Shell_NotifyIcon(NIM_ADD,&data); SSL%$:l@  
 ShowWindow(SW_HIDE); b68G&z>   
 bTray=TRUE; V\rIN}7  
} f@F^W YQm  
`:bvuc(  
void CCaptureDlg::DeleteIcon() ~ ];6hxv  
{ Q#J>vwi=  
 NOTIFYICONDATA data; >F\rBc&  
 data.cbSize=sizeof(NOTIFYICONDATA); XTi0,e]5{u  
 data.hWnd=GetSafeHwnd(); $3]E8t  
 data.uID=98; "zeJ4f  
 Shell_NotifyIcon(NIM_DELETE,&data); {-v\&w  
 ShowWindow(SW_SHOW); >jrz;r  
 SetForegroundWindow(); Vhbj.eX.)  
 ShowWindow(SW_SHOWNORMAL); x^='pEt{  
 bTray=FALSE; [:R P9r}  
} q~g&hR}K  
[! dnm1   
void CCaptureDlg::OnChange() +SuUI-.  
{ ku[=QsMv  
 RegisterHotkey(); X>@.-{6T  
} iu6WGm R  
 Z@.ol Y  
BOOL CCaptureDlg::RegisterHotkey() }ygbgyLa  
{ TgQ|T57  
 UpdateData(); ,# jOf{L*  
 UCHAR mask=0; wzQdKlV  
 UCHAR key=0; j$mt*z L  
 if(m_bControl) xo)?XFM2  
  mask|=4; -MHX1`P:Sn  
 if(m_bAlt) ]/V Iff  
  mask|=2; S] K6qY  
 if(m_bShift) X_tW#`  
  mask|=1; o+)LcoP u  
  key=Key_Table[m_Key.GetCurSel()]; (;Q <@PZg  
 if(bRegistered){ &6|^~(P?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); {HRxyAI!  
  bRegistered=FALSE; A^r [_dyZ  
 } 9tc@   
 cMask=mask; &h4Z|h[01  
 cKey=key; sNk>0 X[  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); eFXi )tl  
 return bRegistered; wkZ2Y-#='  
} 1z};"A  
WJFTy+bD  
  四、小结 qq9tBCk  
RP@idz  
  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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