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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: HBlk~eZ  
  K@JZ$  
  一、实现方法 W__ArV2Z_  
#@R0$x  
  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: B `(jTL  
Z(mUU]  
#pragma data_seg("shareddata") \ TV  
HHOOK hHook =NULL; //钩子句柄 Rs%`6et}\  
UINT nHookCount =0; //挂接的程序数目 1[FN: hm  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5^B79A"}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 nV' 1 $L#  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey O2w-nd74U  
static int KeyCount =0; zF1!a  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Abc{<4 z0?  
#pragma data_seg() [9m3@Yd'  
AGlBvRX7e  
  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。 G@]3EP  
Hfcpqa  
  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: oaIk1U;g  
~k"+5bHa*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR '6so(>|  
cKey,UCHAR cMask) t R^f]+Up  
{ LrB 0x>  
 BOOL bAdded=FALSE; HIg2y  
 for(int index=0;index<MAX_KEY;index++){ '7iz5wC#  
  if(hCallWnd[index]==0){ ~Amq1KU*Z  
   hCallWnd[index]=hWnd; T5XXC1+  
   HotKey[index]=cKey; D6"=2XR4n  
   HotKeyMask[index]=cMask; `m,4#P-kj  
   bAdded=TRUE; (MwRe?Ih  
   KeyCount++; ,}oAc  
   break; &f*o rM:  
  } b^o4Q[  
 } X1j8tg  
 return bAdded; iT]t`7R  
} Rh>B# \  
//删除热键 -ng1RA>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8Fn\ycX#"l  
{ R9XU7_3B  
 BOOL bRemoved=FALSE; t{md&k4  
 for(int index=0;index<MAX_KEY;index++){ TW|K.t@5#H  
  if(hCallWnd[index]==hWnd){ ^Q/*on;A,/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [+ud7l  
    hCallWnd[index]=NULL; $8tk|uh  
    HotKey[index]=0; D"7}&Ry:  
    HotKeyMask[index]=0; 55Ss%$k@  
    bRemoved=TRUE; `TrWtSwv  
    KeyCount--; s9 - qR_  
    break; C6!F6Stn]g  
   } 9`in r.:  
  } .#[ 9q-  
 } N} EKV  
 return bRemoved; 0TU3 _;o  
} 57\ 0MQO  
Y_Yf'z1>[  
X8C7d6ca  
  DLL中的钩子函数如下: I)HO/i 6>3  
c-w #`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <BR^Dv07U  
{ .. `I <2  
 BOOL bProcessed=FALSE; #M-!/E  
 if(HC_ACTION==nCode) SUS=sR/N  
 { fG0?"x@>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 C}huU  
   switch(wParam) HC iRk1  
   {  V_7\VKR  
    case VK_MENU: P9v(5Z00|d  
     MaskBits&=~ALTBIT; F}; R  
     break; }b_Ob  
    case VK_CONTROL: #QNN;&L]R  
     MaskBits&=~CTRLBIT; AA\a#\#Z3  
     break; dN8Mfa)  
    case VK_SHIFT: Q}BMvR 9w  
     MaskBits&=~SHIFTBIT; \Y P,}_ ~  
     break; U]PB)  
    default: //judge the key and send message hD6BP  
     break; d NACE*g;q  
   } lF}[ YL  
   for(int index=0;index<MAX_KEY;index++){ nY'V,v[F  
    if(hCallWnd[index]==NULL) VfU"%0x  
     continue; (r|m&/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sJ6.3= c  
    { F8pA)!AH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =uP? ?E  
     bProcessed=TRUE; ( bwD:G9  
    } B[b>T=  
   } +kSu{Tc  
  } X%Ok ">  
  else if((lParam&0xc000ffff)==1){ //有键按下 Be6Yh~m  
   switch(wParam) mU5Ox4>&9  
   { t.P@Ba^  
    case VK_MENU: "\4W])30  
     MaskBits|=ALTBIT; =2\2Sp  
     break; +O}Ik.w  
    case VK_CONTROL: <4}m:  
     MaskBits|=CTRLBIT; n !)$e;l  
     break; 3H2~?CaJ  
    case VK_SHIFT: S<Dbv?  
     MaskBits|=SHIFTBIT; ;V,L_"/X  
     break; q/O2E<=w*c  
    default: //judge the key and send message M2Q,&>M   
     break; :_e[xB=Yy  
   } ;aQ`` B  
   for(int index=0;index<MAX_KEY;index++){ _ *f>UW*,  
    if(hCallWnd[index]==NULL) omE- c  
     continue; KC;cu%H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v[dU UR f  
    { xf,[F8 2y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3h7RQ:lUi  
     bProcessed=TRUE; adLL7  
    } z33UER"  
   } CG1MT(V7?  
  } }gbLWx'iG  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 o/pw=R/):  
   for(int index=0;index<MAX_KEY;index++){ z,,"yVk`,  
    if(hCallWnd[index]==NULL) >|taU8^|G}  
     continue; JFT$1^n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z; GQnAG@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g=Z52y`N<  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 25>R^2,LiE  
   } * %D_\0;  
  } n`,  <g  
 } )vW'g3u_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); nPyn~3  
} I~4z%UG  
2e_ Di(us  
  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: Qs1p  
JK$3qUDnI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u)oAQ<w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~ZKJ:&f  
eF+F"|1h  
  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: 'f( CN3.!  
64B.7S88  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <>HtXn/  
{ x^ `/&+m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) VYG@_fd!x  
 { <6UXk[y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 PUR,r%K`  
  SaveBmp(); 63l3WvoK  
  return FALSE; NLy4Z:&{  
 } X4%uY  
 …… //其它处理及默认处理 t^01@ejM+  
} 3](hMk,}  
/.]u%;%r[  
 2%@tnk|@  
  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。 ajSB3}PN  
M@[W"f Wq  
  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。 6KddHyFz  
Ci`o;KVj  
  二、编程步骤 DNGyEC  
n0KpKH<&  
  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"; AjK5x@\  
KA2>[x2  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; p/Pus;*s  
x Lan1V  
  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; Z9vMz3^N  
$@PruY3[  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ;\K]~  
TiD#t+g  
  5、 添加代码,编译运行程序。 WARiw[  
mG[jR*JW  
三、程序代码 tVG;A&\,6  
i-|N6J  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 7 yE\,  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) z~t0l  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ VeQGdyhY  
#if _MSC_VER > 1000 \5a.JfF  
#pragma once Mt.Cj;h@^[  
#endif // _MSC_VER > 1000 T AG@Ab  
#ifndef __AFXWIN_H__ wV )\M]@  
#error include 'stdafx.h' before including this file for PCH Ph^1Ko" 2  
#endif B_[efM<R$  
#include "resource.h" // main symbols hO"!q;<eS  
class CHookApp : public CWinApp pS$9mzY  
{ ,C,nNaW  
 public: U'=8:&  
  CHookApp(); h$8h@2%  
  // Overrides 3t-STk?  
  // ClassWizard generated virtual function overrides &~*](Ma  
  //{{AFX_VIRTUAL(CHookApp) (WHg B0{  
 public: 8H7#[?F  
  virtual BOOL InitInstance(); L\#YFf  
  virtual int ExitInstance(); U p@^C"  
  //}}AFX_VIRTUAL eha|cAq  
  //{{AFX_MSG(CHookApp) +u|"q+p  
  // NOTE - the ClassWizard will add and remove member functions here. Jl_W6gY"Z  
  // DO NOT EDIT what you see in these blocks of generated code ! L6h<B :l  
  //}}AFX_MSG g+B7~Z5,  
  DECLARE_MESSAGE_MAP() _y4O2n[e  
}; F0!Z1S0g  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 9"#C%~=+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !q&Td  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,:mL\ZED  
BOOL InitHotkey(); |y^=(|eM  
BOOL UnInit(); -))S  
#endif b-ss^UL  
A:m+v{*`4  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.  qNJc*@s  
#include "stdafx.h"  SCfp5W7~  
#include "hook.h" !h #ZbErW  
#include <windowsx.h> %SC Jmn2  
#ifdef _DEBUG kt6)F&;$  
#define new DEBUG_NEW SZH`-xb!+5  
#undef THIS_FILE /Bt!xSI  
static char THIS_FILE[] = __FILE__;  26p[x'W  
#endif @)d_zWE  
#define MAX_KEY 100 LK DfV  
#define CTRLBIT 0x04  .2&L.  
#define ALTBIT 0x02 ]@ruizb8  
#define SHIFTBIT 0x01 M P8Sd1_=  
#pragma data_seg("shareddata") Hs)Cf)8u  
HHOOK hHook =NULL; ?z>J7 }w*=  
UINT nHookCount =0; /3M8 ;>@u  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey *H!BThft4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 'LMj.#A<g  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey rfk{$g  
static int KeyCount =0; H=@KlSC ^  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 3Y Mqp~4  
#pragma data_seg() N>(w+h+  
HINSTANCE hins; glLVT i  
void VerifyWindow(); W{-g?)Tou  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) i.^ytbH  
//{{AFX_MSG_MAP(CHookApp) Rq|6d M6H  
// NOTE - the ClassWizard will add and remove mapping macros here. ) A:h  
// DO NOT EDIT what you see in these blocks of generated code! a <C?- g|  
//}}AFX_MSG_MAP JOuyEPy  
END_MESSAGE_MAP() opH!sa@U  
Lf(( zk:pt  
CHookApp::CHookApp() 3RaW\cWzg  
{ _^W;J/He  
 // TODO: add construction code here, U;W9`JT<.f  
 // Place all significant initialization in InitInstance nF'YG+;|@  
} _tHhS@   
Mz&/.A  
CHookApp theApp; l:'#pZ4T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ( unmf,y  
{ / <)Vd  
 BOOL bProcessed=FALSE; KRL.TLgq)  
 if(HC_ACTION==nCode) j{lurb)y  
 { lWYp  
  if((lParam&0xc0000000)==0xc0000000){// Key up \2kLj2!  
   switch(wParam) &%rM|  
   { l Xa/5QKC  
    case VK_MENU: fJlNxdVr  
     MaskBits&=~ALTBIT; p{5m5x  
     break; t8-P'3,Q$  
    case VK_CONTROL: S46aUkW.  
     MaskBits&=~CTRLBIT; O[VY|.MEk  
     break; 0Agse)  
    case VK_SHIFT: e@vtJaSu  
     MaskBits&=~SHIFTBIT; ]mMJ6n  
     break; 42]7N3:'  
    default: //judge the key and send message Aax;0qGbH  
     break; l~"T>=jq3  
   } SAdT#0J  
   for(int index=0;index<MAX_KEY;index++){ jh/,G5RM9  
    if(hCallWnd[index]==NULL) BP9#}{kE  
     continue; %rb$tKk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9nN1f@Y  
    { qt}M&=}8Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kQmkS^R  
     bProcessed=TRUE; &Pb:P?I  
    } bg Ux&3  
   } $.vm n,:.  
  } 3q73L<f  
  else if((lParam&0xc000ffff)==1){ //Key down nsI+04[F  
   switch(wParam) Mw0>p5+ cy  
   { o*)Sg6Yk  
    case VK_MENU: 8GP17j  
     MaskBits|=ALTBIT; $~1vXe  
     break; @[lMh9`  
    case VK_CONTROL: Bh&pZcm|  
     MaskBits|=CTRLBIT; dCi:@+z8  
     break; dJgLS^1E  
    case VK_SHIFT: o=R(DK# U  
     MaskBits|=SHIFTBIT; R` < ^/h  
     break; b;b,t0wS  
    default: //judge the key and send message ZxNTuGOB:  
     break; 5;}W=x^$a  
   } EQ273sdK  
   for(int index=0;index<MAX_KEY;index++) 0S4BV%7F  
   { R1H^CJ=v0  
    if(hCallWnd[index]==NULL) *#YZm>h   
     continue; U1r]e%df)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~Fuq{e9`  
    { mxqD'^n#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Mm$\j*f/  
     bProcessed=TRUE; @#4-4.6I<x  
    } 2yK">xYY@  
   } ]^C 8Oh<  
  } CIIjZ)T  
  if(!bProcessed){ T`!R ki%~  
   for(int index=0;index<MAX_KEY;index++){ VVDN3  
    if(hCallWnd[index]==NULL) cuN]}=D  
     continue; tQ{/9bN?P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;+wB!/k,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); nmU1xv_  
   } '|4+< #  
  } {[2o  
 } WrGA7&!+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (1'DZ xJ&u  
} i"G'#n~e  
?z1v_Jh  
BOOL InitHotkey() Oin9lg-jR  
{ F(hPF6Zx(  
 if(hHook!=NULL){ R `tJ7MB  
  nHookCount++; 3Cj)upc  
  return TRUE; >IIq_6Z#  
 } OL 0YjU@  
 else fF)Q;~_VA  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); bKpy?5&>  
  if(hHook!=NULL) q2X::Yqk  
   nHookCount++; AfA"QCyO  
  return (hHook!=NULL); 1@v <  
} 4Et(3[P71  
BOOL UnInit() c;kU|_  
{ Q!P%duO  
 if(nHookCount>1){ 6axxyh%  
  nHookCount--; {J==y;dK  
  return TRUE; Bg]VaTm[=  
 } Ow4_0l&  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -LiGO#U  
 if(unhooked==TRUE){ 4<-Kd~uL  
  nHookCount=0; R@K\   
  hHook=NULL; D<J'\mo  
 } 8lV:-"+5  
 return unhooked; t.ulG *  
} K+`GVmD  
NTt4sWP!I  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) i pn-HUrE@  
{ DDr\Kv)k(  
 BOOL bAdded=FALSE; VwI  
 for(int index=0;index<MAX_KEY;index++){ .~o{i_JH  
  if(hCallWnd[index]==0){  Lw\u{E@  
   hCallWnd[index]=hWnd; WkuCn T  
   HotKey[index]=cKey; jOV6 %  
   HotKeyMask[index]=cMask; sa8O<Ab  
   bAdded=TRUE; */e$S[5  
   KeyCount++; "0!h- bQN  
   break; yF)J7a:U  
  }  zjUQ]  
 } Gt&yz"?D  
 return bAdded; >.qFhO\1so  
} iLnW5yy  
i?/Q7D<P  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^^v3iCT  
{ J,Ki2'=  
 BOOL bRemoved=FALSE; 50MM05aC  
 for(int index=0;index<MAX_KEY;index++){ @m5J%8>k  
  if(hCallWnd[index]==hWnd){ WVeNO,?ytS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !kSemDC  
    hCallWnd[index]=NULL; ]S%_&ZMCM  
    HotKey[index]=0; FXr^ 4B}  
    HotKeyMask[index]=0; ^(TCUY~f&  
    bRemoved=TRUE; 9Vm aB  
    KeyCount--; L~5f*LE$1  
    break; pl>b 6 |  
   } {O>Td9  
  } 7SHllZ  
 } 0G8@UJv6  
 return bRemoved; J6CSu7Voa  
} _5Lcr)  
|6Y:W$7k  
void VerifyWindow() 8~(,qU8-N  
{ \r IOnZ.WK  
 for(int i=0;i<MAX_KEY;i++){ @S3L%lOH  
  if(hCallWnd!=NULL){ ) ' xyK  
   if(!IsWindow(hCallWnd)){ *R+M#l9D`  
    hCallWnd=NULL; 1< vJuF^  
    HotKey=0; wxHd^b  
    HotKeyMask=0; X.#*+k3s0  
    KeyCount--; !ldEy#"X  
   } _qE9]mU  
  } Q qF<HCO  
 } sN1H{W  
} o*204BGB  
uM$b/3%s  
BOOL CHookApp::InitInstance() j(y<oxh  
{ #MY oy7=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); i]<@  
 hins=AfxGetInstanceHandle(); GgE g(AT  
 InitHotkey();  z/91v#}.  
 return CWinApp::InitInstance(); 5{yg  
} ,IhQ%)l  
<p<6!tdO  
int CHookApp::ExitInstance() #om Gj&  
{ M%:\ry4:  
 VerifyWindow(); yreH/$Ou 8  
 UnInit(); 3DO*kM1s@  
 return CWinApp::ExitInstance(); J ?{sTj"KB  
} 9 5!xJdq  
ED8{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file F7<M{h5s  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +On2R&m  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ imADjBR]  
#if _MSC_VER > 1000 1CJ1-]S(3  
#pragma once #*:1Ch]B  
#endif // _MSC_VER > 1000 <q'?[aKvR  
 zr ez*  
class CCaptureDlg : public CDialog ;L:UYhDbUx  
{ rWWp P<  
 // Construction "zw{m+7f,  
 public: ]iTP5~8U  
  BOOL bTray; ;LgMi5dN  
  BOOL bRegistered; T ^eD  
  BOOL RegisterHotkey(); yE N3/-S+  
  UCHAR cKey; $~q{MX&J  
  UCHAR cMask; 6DHZ,gWq  
  void DeleteIcon(); 1g=T"O&=  
  void AddIcon(); CHS}tCfos>  
  UINT nCount; y=9fuGL6  
  void SaveBmp(); b:9"nALgC  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?4%#myO3a  
  // Dialog Data X7*ossv  
  //{{AFX_DATA(CCaptureDlg) R[j'<gd.  
  enum { IDD = IDD_CAPTURE_DIALOG }; A PSkW9H  
  CComboBox m_Key; Gmu[UI}w8  
  BOOL m_bControl; V9ZM4.,OCN  
  BOOL m_bAlt; 6 [bQ'Ir^8  
  BOOL m_bShift; [GCaRk>b,  
  CString m_Path; D+AkV|  
  CString m_Number; !|9@f$Jv  
  //}}AFX_DATA 0xi2VN"X  
  // ClassWizard generated virtual function overrides `!X8Cn  
  //{{AFX_VIRTUAL(CCaptureDlg) ~rrl" a>  
 public: ]hlQU%&  
  virtual BOOL PreTranslateMessage(MSG* pMsg); xTG5VBv  
 protected: S9*68l  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7&etnQJ{  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); CNV^,`FX  
  //}}AFX_VIRTUAL  {y{O ze  
  // Implementation kb$Yc)+R4  
 protected: <bJ|WS|  
  HICON m_hIcon; "WY5Pzsi:  
  // Generated message map functions V9KRA 1  
  //{{AFX_MSG(CCaptureDlg) 9Pvv6WyKy  
  virtual BOOL OnInitDialog(); [#aJ- Uu  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); n2o)K;wW+  
  afx_msg void OnPaint(); NHU5JSlB  
  afx_msg HCURSOR OnQueryDragIcon(); L8E4|F}  
  virtual void OnCancel(); >`WQxkpy  
  afx_msg void OnAbout(); - ]/=WAOK  
  afx_msg void OnBrowse(); wtL=^  
  afx_msg void OnChange(); uCt?(E>  
 //}}AFX_MSG LCXWpU j~  
 DECLARE_MESSAGE_MAP() qz)KCEs  
}; HXh:8 3  
#endif M!hD`5.3  
/V/ )A\g  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \0i0#Dt9  
#include "stdafx.h" ;fQIaE&H  
#include "Capture.h" "\lO Op^-  
#include "CaptureDlg.h" *k&V;?x|wt  
#include <windowsx.h> 6[FXgCb  
#pragma comment(lib,"hook.lib") <D&  Ep  
#ifdef _DEBUG V~8]ag4  
#define new DEBUG_NEW lRS'M,/  
#undef THIS_FILE $<VH~Q<  
static char THIS_FILE[] = __FILE__; _`*G71PS  
#endif //3fgoly  
#define IDM_SHELL WM_USER+1 ifWQwS/,a  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "J&WH~8+N  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TrgKl2xfx  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; m1K4_a)^[  
class CAboutDlg : public CDialog Z6So5r%wZ  
{ /&qE,>hd.+  
 public: YHgNL LZ?  
  CAboutDlg(); o*~=NoR  
  // Dialog Data O<AGAD  
  //{{AFX_DATA(CAboutDlg) <v\$r2C*  
  enum { IDD = IDD_ABOUTBOX }; r_8;aPL  
  //}}AFX_DATA FBrh!vQ<  
  // ClassWizard generated virtual function overrides vEE\{1  
  //{{AFX_VIRTUAL(CAboutDlg) < h|&7  
 protected: %"#ydOy  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O#!|2qN  
  //}}AFX_VIRTUAL [Tvdchl OC  
  // Implementation nXuy&;5TL,  
 protected: @d8Nr:  
  //{{AFX_MSG(CAboutDlg) 2#qc YU  
  //}}AFX_MSG CCC9I8rZD  
  DECLARE_MESSAGE_MAP() Te3 ?z  
}; y(a>Y! dgU  
all2?neK  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ([SJ6ff]&  
{ vwAhNw2-  
 //{{AFX_DATA_INIT(CAboutDlg) s[7/w[&  
 //}}AFX_DATA_INIT (B*,|D[J@i  
} GAs.?JHd  
svt3gkR0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) [tC=P&<  
{ 2h@&yW2j  
 CDialog::DoDataExchange(pDX); ww+,GnV  
 //{{AFX_DATA_MAP(CAboutDlg) A&ceuu  
 //}}AFX_DATA_MAP Rb^G~82d?  
} NTGWI$  
wSZMHIW  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4UPxV"H  
 //{{AFX_MSG_MAP(CAboutDlg) RA){\~@wC  
 // No message handlers 6#:V3 ;  
 //}}AFX_MSG_MAP <jaQ 0S{|  
END_MESSAGE_MAP() T`u ,!S  
6Xn9$C)  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) k5}Qx'/l  
: CDialog(CCaptureDlg::IDD, pParent) WFmW[< g  
{ 3:c6x kaw  
 //{{AFX_DATA_INIT(CCaptureDlg) V~-tp^  
  m_bControl = FALSE; ^%\MOjSN  
  m_bAlt = FALSE; R9K~b^`  
  m_bShift = FALSE; Y!y pG-  
  m_Path = _T("c:\\"); 2PNe~9)*#  
  m_Number = _T("0 picture captured."); 4,=;:#n,J  
  nCount=0; ZBQ@S  
  bRegistered=FALSE; 1bDXv, nD  
  bTray=FALSE; >C5u>@%9O  
 //}}AFX_DATA_INIT f"4w@X2F  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 m3(p7Z^Bq  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); NE &{_i!  
} #7YJ87<E  
gTLBR  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) o>]z~^c  
{ G~ 4G$YL*  
 CDialog::DoDataExchange(pDX); M D& 7k,!  
 //{{AFX_DATA_MAP(CCaptureDlg) L@?3E`4/v  
  DDX_Control(pDX, IDC_KEY, m_Key); V1Gnr~GM  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); }P\6}cK  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 3".#nN  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); D mky!Cp  
  DDX_Text(pDX, IDC_PATH, m_Path); q}z`Z/`/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); rzvKvGd#N  
 //}}AFX_DATA_MAP 0q]0+o*%  
} G2sj<F=AV  
z${[Z=  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wIWO?w2  
//{{AFX_MSG_MAP(CCaptureDlg) Vkf{dHjW  
 ON_WM_SYSCOMMAND()  niyxZ<Z  
 ON_WM_PAINT() 0<f.r~  
 ON_WM_QUERYDRAGICON() 7^d7:1M  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) =<K6gC27  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Bf[`o<c  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &2ty++gC  
//}}AFX_MSG_MAP ;R@D  
END_MESSAGE_MAP() sfy}J1xIL  
{#pw rWG  
BOOL CCaptureDlg::OnInitDialog() 2^rJ|Ni  
{ m|OB_[9  
 CDialog::OnInitDialog(); lO0}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Jy('tfAHp  
 ASSERT(IDM_ABOUTBOX < 0xF000); e:rbyzf#  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]8'PLsS9<w  
 if (pSysMenu != NULL) t4hc X[  
 {  &Du S*  
  CString strAboutMenu; ['K}p24,  
  strAboutMenu.LoadString(IDS_ABOUTBOX); N9rAosO*  
  if (!strAboutMenu.IsEmpty()) `UqX`MFz  
  { VZ 7(6?W  
   pSysMenu->AppendMenu(MF_SEPARATOR); OpK_?XG  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); T)ISDK4>S"  
  } M[Nv>  
 } 4_$.gO  
 SetIcon(m_hIcon, TRUE); // Set big icon K7nyQGS  
 SetIcon(m_hIcon, FALSE); // Set small icon |TR +Wn  
 m_Key.SetCurSel(0); @:>gRD  
 RegisterHotkey(); ~zWLqnS}  
 CMenu* pMenu=GetSystemMenu(FALSE); hp2$[p6O  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); h b8L[ 4  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); y3PrLBTz  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {9^p3Q+:P  
 return TRUE; // return TRUE unless you set the focus to a control B`jq"[w]-  
} 1i)3!fH0:  
Jz P0D'  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Cbm^: _LR  
{ aEVy20wd  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) } .<(L  
 { "I9r>=  
  CAboutDlg dlgAbout; ~mMTfC~9  
  dlgAbout.DoModal(); K5jeazasp  
 } 8yH)9#>  
 else 3iL\<^d*ht  
 { !?+q7U  
  CDialog::OnSysCommand(nID, lParam); k*Aee7  
 } $2-_j)+  
} S.<4t*,  
wTG(U3{3K  
void CCaptureDlg::OnPaint() O}}rosA  
{ qL[ SwEc  
 if (IsIconic()) ZNL+w4  
 { \wK4bvUrX  
  CPaintDC dc(this); // device context for painting VYt<j<ba  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); m^,VEV>  
  // Center icon in client rectangle M* {5> !\  
  int cxIcon = GetSystemMetrics(SM_CXICON); Z/|=@gpw  
  int cyIcon = GetSystemMetrics(SM_CYICON); :3b02}b7  
  CRect rect; Q( e  
  GetClientRect(&rect); 8.+ yZTg  
  int x = (rect.Width() - cxIcon + 1) / 2; 5OX[)Li  
  int y = (rect.Height() - cyIcon + 1) / 2; !+QfQghAT  
  // Draw the icon k]`-Y E  
  dc.DrawIcon(x, y, m_hIcon); M.:JT31>1  
 } =);@<Jp  
 else j['B9vG  
 { a#& ( i  
  CDialog::OnPaint(); MX.?tN#F|H  
 } D_)/.m  
} 18Ju]U  
;y50t$0  
HCURSOR CCaptureDlg::OnQueryDragIcon() Fmz+ Xb  
{ 5K)_w:U X  
 return (HCURSOR) m_hIcon; /H3w7QU  
} ~P;A 9A(k  
j2.7b1s  
void CCaptureDlg::OnCancel() S kB*w'k  
{ ,LxkdV  
 if(bTray) TU*EtE'g/  
  DeleteIcon(); bX` Gv+  
  CDialog::OnCancel(); &|db}\jT  
} 2% OAQ(  
()F {kM8  
void CCaptureDlg::OnAbout() r9L--#=z  
{ "Wr[DqFd  
 CAboutDlg dlg; l=(( >^i  
 dlg.DoModal(); G#^0Bh&  
} kRBO]  
=;b3i1'U  
void CCaptureDlg::OnBrowse() qd#7A ksm  
{ ,VSO;:Z  
 CString str; a60rJ#GD  
 BROWSEINFO bi; F[`dX  
 char name[MAX_PATH]; E0 E K88  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ?:-:m'jdU  
 bi.hwndOwner=GetSafeHwnd(); K}^# VlY9  
 bi.pszDisplayName=name; {IaDZ/XS6  
 bi.lpszTitle="Select folder"; N;6o=^ic  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; g|7o1{   
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); CyW|k Dz  
 if(idl==NULL) >xq. bG  
  return; m8e()8lZ3  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Kfr1k  
 str.ReleaseBuffer(); cC+2%q B  
 m_Path=str; `|nCnT'  
 if(str.GetAt(str.GetLength()-1)!='\\') Im@OAR4,R  
  m_Path+="\\"; ={V@Y-5T  
 UpdateData(FALSE); Pnm$g; `P  
} <c:H u{D  
pRL:,q\  
void CCaptureDlg::SaveBmp() ( }Bb=~  
{ k+ w Ji  
 CDC dc; rjO{B`sV*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); o[fg:/5)A  
 CBitmap bm; ( N};.DB1Y  
 int Width=GetSystemMetrics(SM_CXSCREEN); fb>$p_s]  
 int Height=GetSystemMetrics(SM_CYSCREEN); '%XYJr:H[  
 bm.CreateCompatibleBitmap(&dc,Width,Height); "J=Cy@SSa  
 CDC tdc; isQOt * i  
 tdc.CreateCompatibleDC(&dc); lG%697P  
 CBitmap*pOld=tdc.SelectObject(&bm); WvSm!W  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9OW8/H&!  
 tdc.SelectObject(pOld); +F2OPIanT~  
 BITMAP btm; .g\Oj0Cbxh  
 bm.GetBitmap(&btm); aekke//y  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *kg->J  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |iUC\F=-  
 BITMAPINFOHEADER bih; g$?^bu dxv  
 bih.biBitCount=btm.bmBitsPixel; kLZVTVSJt  
 bih.biClrImportant=0; ]+W){W=ai  
 bih.biClrUsed=0; O=(F46 M  
 bih.biCompression=0; EwA*  
 bih.biHeight=btm.bmHeight; ZH9Fs'c=  
 bih.biPlanes=1; J{Kw@_ypP  
 bih.biSize=sizeof(BITMAPINFOHEADER); b \ln XN  
 bih.biSizeImage=size; ?4Rd4sIM$u  
 bih.biWidth=btm.bmWidth; V|$PO Qa3  
 bih.biXPelsPerMeter=0; r9'[7b1l  
 bih.biYPelsPerMeter=0; r]Wt!oHm5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); n$r`s`}  
 static int filecount=0; #S'uqP!  
 CString name; Br 7q.  
 name.Format("pict%04d.bmp",filecount++); 3IlVSR^py  
 name=m_Path+name; FpA t  
 BITMAPFILEHEADER bfh; ce}A!v  
 bfh.bfReserved1=bfh.bfReserved2=0; J&,hC%]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); %oTBh*K'o  
 bfh.bfSize=54+size; x5BS|3W$a  
 bfh.bfOffBits=54; X3 kFJ{  
 CFile bf; F}ATY!  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %HoD)OJe  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); &{a!)I>  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 6AG]7d<  
  bf.WriteHuge(lpData,size); UGy3 B)  
  bf.Close(); to</  
  nCount++; ,.>9$(s  
 } h%ys::\zF  
 GlobalFreePtr(lpData); WcNQF!f  
 if(nCount==1) dB0#EJaE  
  m_Number.Format("%d picture captured.",nCount); 3WGET[3  
 else $S|+U}]C  
  m_Number.Format("%d pictures captured.",nCount); &um++ \  
  UpdateData(FALSE); ~io.TS|r  
} [Tp?u8$p`  
Zja3HGL  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Af]zv~uM  
{ }3X/"2SW^  
 if(pMsg -> message == WM_KEYDOWN) 8T T#b?d  
 { Cd 2<r6i  
  if(pMsg -> wParam == VK_ESCAPE) ;Jg$C~3tf  
   return TRUE; \2 N;V E  
  if(pMsg -> wParam == VK_RETURN) %bN{FKNN  
   return TRUE; otR7E+*3  
 } |<,qnf | -  
 return CDialog::PreTranslateMessage(pMsg); vu\W5M  
} 'kt6%d2  
@Xl(A]w%!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) s.i9&1Y-!  
{ WF~BCP$OR  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ nLz;L r!  
  SaveBmp(); WX?nq'nr  
  return FALSE; 8^y=YUT  
} s_IFl5D]  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ B#%QY\<X  
 CMenu pop; yj4"eDg]  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); N{HAWB{  
 CMenu*pMenu=pop.GetSubMenu(0); i~]6 0M>  
 pMenu->SetDefaultItem(ID_EXITICON); >B**fZ~L  
 CPoint pt; ZY`9  
 GetCursorPos(&pt); Uq#2~0n>  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %Tp k1  
 if(id==ID_EXITICON) yV:8>9wE8  
  DeleteIcon(); (l{8Ix s  
 else if(id==ID_EXIT) ;P)oKx  
  OnCancel(); JP<j4/  
 return FALSE; M1-tRF  
} sPvs}}Z]P  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2[+.* Ef  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) pxTtV g.  
 AddIcon(); ;QXg*GNAv$  
 return res; :5%98V>02  
} bTimJp[b  
s_NY#MPz[  
void CCaptureDlg::AddIcon() X1.-C@o  
{ KqntOo} y)  
 NOTIFYICONDATA data; n~ad#iN  
 data.cbSize=sizeof(NOTIFYICONDATA); `~)?OTzU#  
 CString tip; ?DUim1KG  
 tip.LoadString(IDS_ICONTIP); HZRFE[ 9nb  
 data.hIcon=GetIcon(0); t"GnmeH i  
 data.hWnd=GetSafeHwnd(); ,W)DQwAg  
 strcpy(data.szTip,tip); MSS[-}  
 data.uCallbackMessage=IDM_SHELL; ?YL J Xq  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; F8-GnT xa  
 data.uID=98; SED52$zA  
 Shell_NotifyIcon(NIM_ADD,&data); Wn@oG@}~  
 ShowWindow(SW_HIDE); 5WHz_'c  
 bTray=TRUE; zU&Iy_Ke.  
} qSr]d`7@  
giNXX jl  
void CCaptureDlg::DeleteIcon() 6I"KomJ9  
{ h#r~2\q4ei  
 NOTIFYICONDATA data; / e>%yq<9B  
 data.cbSize=sizeof(NOTIFYICONDATA); D=z~]a31!  
 data.hWnd=GetSafeHwnd(); k+ t(u]  
 data.uID=98; <?7qI85OT  
 Shell_NotifyIcon(NIM_DELETE,&data); yHw @Z  
 ShowWindow(SW_SHOW); m)p|NdTZc8  
 SetForegroundWindow(); (dSYb&]  
 ShowWindow(SW_SHOWNORMAL); )\u%XFPhS  
 bTray=FALSE; G]rY1f0  
} t/Io.d   
MygAmV&  
void CCaptureDlg::OnChange() D8L5t<^1R  
{ D2&d",%&f  
 RegisterHotkey(); JyE-c}I  
} xcW\U^1d  
1}wDc$O  
BOOL CCaptureDlg::RegisterHotkey() 9lYfII}4(  
{ 0"OEOYs}  
 UpdateData(); Qpmq@iL  
 UCHAR mask=0; 0o>C, `  
 UCHAR key=0; {FvFah  
 if(m_bControl) 5/'Q0]4h  
  mask|=4; hxL?6mhY  
 if(m_bAlt) HfSx*@\s  
  mask|=2; b=lJ`|  
 if(m_bShift) 59)w+AW  
  mask|=1; &f. |MNz;  
  key=Key_Table[m_Key.GetCurSel()]; 3Y38l P:>h  
 if(bRegistered){ rq3f/_#L!O  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); O^~IY/[  
  bRegistered=FALSE; L3Y,z3/  
 } 7o+L  
 cMask=mask; 3XQa%|N(  
 cKey=key; b V  EJ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); %RV81H9B  
 return bRegistered; >b2!&dm  
} e1W9"&4>G{  
]`$yY5&W0  
  四、小结 o:QL%J{[  
vz4( k/  
  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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