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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: ^vd$j-kjTP  
  % E1r{`p  
  一、实现方法 >]~581fYf  
 : Z<\R0  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: PDD2ouv4  
}}TPu8Rl  
#pragma data_seg("shareddata") /8qR7Z^HZ  
HHOOK hHook =NULL; //钩子句柄 Wu$ryX  
UINT nHookCount =0; //挂接的程序数目 a[~[l k=7  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 GCN-T1HvA2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Vp]7n!g4l  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey +-'F]?DN'  
static int KeyCount =0; R|qrK  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 M{24MF   
#pragma data_seg() g.9C>>tj  
_ $>);qIP4  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 aF?_V!#cT  
vf3)T;X>  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: geyCS3 :p  
*bFWNJ}`q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ;F @Sz/  
cKey,UCHAR cMask) Gxe)5,G  
{ fs#9~b3  
 BOOL bAdded=FALSE; :.g/=Q(T~  
 for(int index=0;index<MAX_KEY;index++){ 8`+=~S  
  if(hCallWnd[index]==0){ o4FHR+u<M  
   hCallWnd[index]=hWnd; ,byc!P  
   HotKey[index]=cKey; 75Z|meG~  
   HotKeyMask[index]=cMask; AJi+JO-  
   bAdded=TRUE; wGLMLbj5  
   KeyCount++; b_ ZvI\H  
   break; a.%ps:  
  } 6NV592  
 } P I"KY@>H  
 return bAdded; ZUHW*U.  
} @~hy'6/  
//删除热键 k)>H=?mI  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ql5bjlQdO  
{ o i'iZX  
 BOOL bRemoved=FALSE; ),N,!15j,  
 for(int index=0;index<MAX_KEY;index++){ ~fkcal1@  
  if(hCallWnd[index]==hWnd){ q#AEu xI1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ M(+Pd_c6  
    hCallWnd[index]=NULL; 4Px|:7~wT8  
    HotKey[index]=0; a+LK~mC*  
    HotKeyMask[index]=0; ,HDhP  
    bRemoved=TRUE; ASy?^Jrs5  
    KeyCount--; 7(o`>7x*  
    break; FA,n>  
   } o$L%t@   
  } |E6_TZ#=  
 } c+3(|k-M  
 return bRemoved; 87!jn'A  
} dnD@BQ  
>|%3j,<U  
 Q(w;  
  DLL中的钩子函数如下: pl r@  
Gz{%Z$A~o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) kB@gy}  
{ Lm}.+.O~d  
 BOOL bProcessed=FALSE; ?=Ceo#Er  
 if(HC_ACTION==nCode) AAa7)^R  
 { vcQl0+&  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 y_L8i[  
   switch(wParam) yrEh5v:  
   {  =A,B'n\R  
    case VK_MENU: `G!HGzVx;j  
     MaskBits&=~ALTBIT; hA 5p'a+K  
     break; _}p [(sTV  
    case VK_CONTROL: >+7{PF+sB  
     MaskBits&=~CTRLBIT; k#pO+[ x  
     break; Mu/(Xp62  
    case VK_SHIFT: :u9'ZHkZ  
     MaskBits&=~SHIFTBIT; DQ+6VPc^o  
     break; \l(J6Tu  
    default: //judge the key and send message *yT>  
     break; h'em?fN(  
   } ')q4d0B`"  
   for(int index=0;index<MAX_KEY;index++){ JqO1 a?H  
    if(hCallWnd[index]==NULL) I;JV-jDM  
     continue; i;{lY1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $`GlXiV  
    { *CXc{{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); LGuZp?"  
     bProcessed=TRUE; }h Wv  p  
    } &u&WP  
   } cy@R i#  
  } b|.Cqsb  
  else if((lParam&0xc000ffff)==1){ //有键按下 2R,} j@  
   switch(wParam) ,!Q nh:  
   { R4 eu,,J  
    case VK_MENU: q n-f&R  
     MaskBits|=ALTBIT; e bp t/q[  
     break; oQ -m  
    case VK_CONTROL: "[7-1}l  
     MaskBits|=CTRLBIT; mmJnE  
     break; %2dzx[s  
    case VK_SHIFT: u3qx G3  
     MaskBits|=SHIFTBIT; `,SL\\%u  
     break; ,*W~M&n"m  
    default: //judge the key and send message ,&@GxiU  
     break; ?l%4 P5  
   } 4F.,Y3  
   for(int index=0;index<MAX_KEY;index++){ U)f('zD  
    if(hCallWnd[index]==NULL) bu6Sp3g  
     continue; A{;"e^a-^l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z<9C-  
    { Q(-&}cY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8>WA5:]v  
     bProcessed=TRUE; 5QK%BiDlr  
    } J/P[9m30[  
   } "|I.j)  
  } t[+bZUS$~  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 "9'3mmZm=?  
   for(int index=0;index<MAX_KEY;index++){ N{bg-%s10i  
    if(hCallWnd[index]==NULL) KE"6I  
     continue; Hre&a!U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <o|fH~?X  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); c6 &k?Puy  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 rzHBop-8  
   } rK'Lvt@w  
  } b||usv[or  
 } J:W+'x`@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); n[e C  
} .*YF{!R`h  
)B $Q  
  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: QWa@?BO2p  
W8bp3JX"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F8<G9#%s\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ByP<-Deh  
!0hyp |F:>  
  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: >k`qPpf&  
[ x+ -N7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y'`7zJ  
{ .9e5@@VR  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) !;8Y?c-D  
 { qdZ ^D  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 eY#^vB  
  SaveBmp(); wipl5O@L  
  return FALSE; R.WB.FP  
 } oS$7k3s fj  
 …… //其它处理及默认处理 40MKf/9  
} \:Tq0|]Px  
'z,kxra|n  
\5&Mg81  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 R98YGW_ dT  
zAM9%W2v_  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 @~s5{4  
dakHH@Q  
  二、编程步骤 @!oN]0`F;  
V  H`_  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 9;%$  
Q e+;BE-H  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; m%u`#67oK  
%T>@Ldt  
  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; &iw,||#  
HdtGyh6X0  
  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; l(rm0_  
i/-IjgM"-  
  5、 添加代码,编译运行程序。 Uv[a ~'  
;6R9k]5P%  
三、程序代码 kJ"rRsK  
kwUUvF7w  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 9Br+]F _i  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) d+)LK~  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~l:Cj*6x8  
#if _MSC_VER > 1000 ssQ1u.x9  
#pragma once 3<<wHK;)  
#endif // _MSC_VER > 1000 *:d ``L  
#ifndef __AFXWIN_H__ r3?8nQ$  
#error include 'stdafx.h' before including this file for PCH +|bmUm<2  
#endif `^{G`es  
#include "resource.h" // main symbols _ZavY<6  
class CHookApp : public CWinApp !I1p`_(_7  
{ =7TWzUCO#  
 public: T rh t2Iv  
  CHookApp(); b+:mV7eX  
  // Overrides Txo{6nd/  
  // ClassWizard generated virtual function overrides Eh;Ia6}  
  //{{AFX_VIRTUAL(CHookApp) $:5h5Y#z  
 public: zUJXA:L9  
  virtual BOOL InitInstance(); p*jU)@a0  
  virtual int ExitInstance(); $]#8D>E&  
  //}}AFX_VIRTUAL N)cODy([  
  //{{AFX_MSG(CHookApp) u q 9mq"  
  // NOTE - the ClassWizard will add and remove member functions here. !QAndg{;D  
  // DO NOT EDIT what you see in these blocks of generated code !  !{V`N|0  
  //}}AFX_MSG 5!9y nIC+>  
  DECLARE_MESSAGE_MAP() MHWc~@R  
}; OQ2G2>p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); gNxv.6Pp=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >CKa?N;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5K9W5hA:D  
BOOL InitHotkey(); r)>'cjx/  
BOOL UnInit(); SE(<(w  
#endif *IbDA  
Y<POdbg  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. z5({A2q  
#include "stdafx.h" hoBFC1  
#include "hook.h" #]+BIr`  
#include <windowsx.h> 4d@0v n{  
#ifdef _DEBUG M6MxY\uM  
#define new DEBUG_NEW mQ}\ptdfV  
#undef THIS_FILE Eyf17  
static char THIS_FILE[] = __FILE__; 74 ptd,  
#endif 0P$19T N  
#define MAX_KEY 100 XdIno}pN  
#define CTRLBIT 0x04 \I i# R  
#define ALTBIT 0x02 $#e}9g.  
#define SHIFTBIT 0x01 \4$Nx/@Q}  
#pragma data_seg("shareddata") ?~.9: 93  
HHOOK hHook =NULL; E l.eK9L  
UINT nHookCount =0; dk]  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey B> i^w1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT N%:uOX8{  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 7.NL>:lu  
static int KeyCount =0; JYjc^m  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1*9Yy~w  
#pragma data_seg() `4@` G:6BL  
HINSTANCE hins; :, H_ e! X  
void VerifyWindow(); .Sw4{m[g  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) </<z7V,{  
//{{AFX_MSG_MAP(CHookApp) n@@tO#!\  
// NOTE - the ClassWizard will add and remove mapping macros here. tZ=|1lM  
// DO NOT EDIT what you see in these blocks of generated code! /Tl ybSC1  
//}}AFX_MSG_MAP )N{PWSPs  
END_MESSAGE_MAP() 8z=o.\@  
|#*+#27  
CHookApp::CHookApp() 4ybOK~z  
{ oKSW:A  
 // TODO: add construction code here, $(J)F-DB i  
 // Place all significant initialization in InitInstance wAR:GO'n  
} .w m<l:  
ZPM7R3%V)z  
CHookApp theApp; T06w`'aL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <5]_u:  
{ 4mBM5Tv  
 BOOL bProcessed=FALSE; UlN}SddI9  
 if(HC_ACTION==nCode) L}8 }Pns?&  
 { #9"lL1  
  if((lParam&0xc0000000)==0xc0000000){// Key up b N>Ar  
   switch(wParam) /mE:2K]C  
   { \2@9k`  
    case VK_MENU: J=^5GfM)J  
     MaskBits&=~ALTBIT; ND9;%<80  
     break; *sfz+8Y  
    case VK_CONTROL: !5m~qet.  
     MaskBits&=~CTRLBIT; v/KTEM  
     break; B7{j$0fm*  
    case VK_SHIFT: ]6=opvm  
     MaskBits&=~SHIFTBIT; +W>tdxOh  
     break; $\4Or  
    default: //judge the key and send message c$A}mL_  
     break; e!i.u'z  
   } =|-xj h  
   for(int index=0;index<MAX_KEY;index++){ F+xMXBD@>*  
    if(hCallWnd[index]==NULL) bg4VHT7?>)  
     continue; <N 80MU L|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g5Hsz,x  
    { I GcR5/3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); S9/\L6Rmf  
     bProcessed=TRUE; DML0paOm5  
    } 8^-g yx'  
   } 9D%~~~ %b  
  } Q"xDRQA  
  else if((lParam&0xc000ffff)==1){ //Key down jT QN(a9Y  
   switch(wParam) *OE>gg&?Nh  
   { ~ C_2D?  
    case VK_MENU: g=v[@{9Pw  
     MaskBits|=ALTBIT; E\}Q9, Z$  
     break; kr1^`>O5  
    case VK_CONTROL: d7c m?+  
     MaskBits|=CTRLBIT; Z[j-.,Qu  
     break; )>=|oY3  
    case VK_SHIFT: d<;XQ.Wo7  
     MaskBits|=SHIFTBIT; iN`L*h  
     break; ER$~kFE2yP  
    default: //judge the key and send message kS7T'[d  
     break; Y50$ 2%kM  
   } ~0.@1zEXj  
   for(int index=0;index<MAX_KEY;index++) YX2j;Y?  
   { >y q L  
    if(hCallWnd[index]==NULL) oWOH#w  
     continue; z#&qWO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \}qv}hU  
    { ]@1ncn7N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); RzSN,bL R  
     bProcessed=TRUE; p7O4CP>9[  
    } p/s5[>N  
   } :(x 90;DW  
  } /%N~$ &wW  
  if(!bProcessed){ wA)R7%&  
   for(int index=0;index<MAX_KEY;index++){ XlNB9\"5  
    if(hCallWnd[index]==NULL) s*}d`"YvH  
     continue; 0$49X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) PsD]gN5"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); sAc)X!}  
   } 0P53dF  
  } BQ&h&57K  
 } /L[:C=u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }`^<ZNkb/  
} ln!KL'T]  
}mJ)gK5b 6  
BOOL InitHotkey() B "}GAk}V  
{ I`KN8ll  
 if(hHook!=NULL){ 9p$q@Bc  
  nHookCount++; `^N;%[c`z  
  return TRUE; J5rR?[i{  
 } WCWBvw4&"{  
 else _H3cqD  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); N4 mQN90t  
  if(hHook!=NULL) aH$*Ue@Q  
   nHookCount++; A><%"9pZ  
  return (hHook!=NULL); +Q_Gm3^  
}  L_Ai/'  
BOOL UnInit() Ri-wbYFaP  
{ $S cjEG:6  
 if(nHookCount>1){ T +4!g|Y  
  nHookCount--; Ip 1QmP  
  return TRUE; ;[ zx'e?!  
 } h/w- &7t  
 BOOL unhooked = UnhookWindowsHookEx(hHook); %r,2ZLZ  
 if(unhooked==TRUE){ hQ8{ A7  
  nHookCount=0; >\p}UPx  
  hHook=NULL; ,!py n<_  
 } =O _[9kuJ  
 return unhooked; da^9Fb  
} ta 4<d)nB  
Vis?cuU/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) E0h!%/+-L  
{ kI;^V  
 BOOL bAdded=FALSE; WK^qYfq|  
 for(int index=0;index<MAX_KEY;index++){ 1!NaOfP;@  
  if(hCallWnd[index]==0){ dX3> j{_  
   hCallWnd[index]=hWnd; %E!0,y,:  
   HotKey[index]=cKey; fu&]t8MJC  
   HotKeyMask[index]=cMask; G`W+m*[U+M  
   bAdded=TRUE; BzUx@,  
   KeyCount++; lJ,s}l7  
   break; |O+binq  
  } \%^3Izsc  
 } p.IfJ|  
 return bAdded; ";. 3+z  
} ~gDtj&F  
FxT [4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6u7HO-aa  
{ #sHP\|rA  
 BOOL bRemoved=FALSE; 5m3sjcp_  
 for(int index=0;index<MAX_KEY;index++){ i! nl%%  
  if(hCallWnd[index]==hWnd){ 8UZE C-K  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Te/)[I'Tn  
    hCallWnd[index]=NULL; u60l-  
    HotKey[index]=0; %~[F^  
    HotKeyMask[index]=0; /L8=8  
    bRemoved=TRUE; D.GSl  
    KeyCount--; u!S{[7 FY  
    break; A| +{x4s`  
   } 8YJ({ Ou_  
  } Y#5S;?bR  
 } ]_,~q@r$  
 return bRemoved; +$'/!vN  
} BW;u? 1Xa  
_B[(/wY  
void VerifyWindow() yiUdUw/  
{ 32Z4&~ I  
 for(int i=0;i<MAX_KEY;i++){ dA~6{*)  
  if(hCallWnd!=NULL){  h 2zCX  
   if(!IsWindow(hCallWnd)){ sOW|TN>y\  
    hCallWnd=NULL; q.t5L=l^ r  
    HotKey=0; mB~&nDU  
    HotKeyMask=0; PrcM'Q  
    KeyCount--; $p@g#3X`  
   } {Q"<q`c  
  } PTh Ya  
 } &Hqu`A/^  
} rG]Xgq"   
( FRf.mv{  
BOOL CHookApp::InitInstance() T_dd7Ym'8  
{ 8K/lpqw  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); D. e*IP1R  
 hins=AfxGetInstanceHandle(); {m?x},  
 InitHotkey(); $} Myj'`r  
 return CWinApp::InitInstance(); |+bG~~~%j  
} .,,73"  
(!(bysi9  
int CHookApp::ExitInstance() F*=RP$sj  
{ B+LNDnjO]  
 VerifyWindow(); V_kE"W)  
 UnInit(); sFTIRVXN,  
 return CWinApp::ExitInstance(); Y(f-e,  
} xd3  
U{Z>y?V/  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^J_hkw~gO  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) qr 9 F  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [8w2U%}]  
#if _MSC_VER > 1000 YB|9k)Z2[  
#pragma once K&h6#[^\d  
#endif // _MSC_VER > 1000 ihVQ,Cth  
= !X4j3Cv  
class CCaptureDlg : public CDialog ZIp=JR8o$  
{ u/f&Wq/  
 // Construction p3o?_ !Z  
 public: 68*{Lo?U  
  BOOL bTray; |*5nr5c_L  
  BOOL bRegistered; 4#w^PM8}  
  BOOL RegisterHotkey(); qu%s 7+  
  UCHAR cKey; ?+\,a+46P_  
  UCHAR cMask; 7fqYSMHR  
  void DeleteIcon(); Dhoj|lc  
  void AddIcon(); rWXW}Yg  
  UINT nCount; |9I;`{@  
  void SaveBmp(); O)R0,OPb  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor B .mV\W  
  // Dialog Data M}Mzm2d#`  
  //{{AFX_DATA(CCaptureDlg) *@nUas 2"  
  enum { IDD = IDD_CAPTURE_DIALOG }; ?s]`G'=>V`  
  CComboBox m_Key; JPG!cX%  
  BOOL m_bControl; [ UJj*n  
  BOOL m_bAlt; )QD}R36Ic  
  BOOL m_bShift; `9l\ ~t(M  
  CString m_Path; o{p_s0IX;S  
  CString m_Number; 3XtGi<u  
  //}}AFX_DATA @U JmbD{  
  // ClassWizard generated virtual function overrides z sPuLn9G  
  //{{AFX_VIRTUAL(CCaptureDlg) )|x5#b-lz  
 public: lijy?:__  
  virtual BOOL PreTranslateMessage(MSG* pMsg); GB3B4)cX4Y  
 protected: K7c8_g*>4=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Uj)]nJX  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); iurB8~Y  
  //}}AFX_VIRTUAL }i:'f 2/  
  // Implementation VHCzlg  
 protected: h6i{5\7.  
  HICON m_hIcon; Gu).*cU  
  // Generated message map functions :F=nb+HZ  
  //{{AFX_MSG(CCaptureDlg) H)Ge#=;ckQ  
  virtual BOOL OnInitDialog(); P;&p[[7  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); N~jQ!y  
  afx_msg void OnPaint(); 5nAF=Bj  
  afx_msg HCURSOR OnQueryDragIcon(); [ )~@NN  
  virtual void OnCancel(); )g _zPt  
  afx_msg void OnAbout(); UAZ&*{MM^  
  afx_msg void OnBrowse(); hJsC \C,^  
  afx_msg void OnChange(); 4 G[hU4L  
 //}}AFX_MSG Yur)_m  
 DECLARE_MESSAGE_MAP() @/L. BfTz  
}; |$2N$6\SP  
#endif J *?_SnZ  
Vz]=J;`Mz  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C:MGi7f  
#include "stdafx.h" x~^I/$  
#include "Capture.h" |81N/]EER  
#include "CaptureDlg.h" 6~W E#z_  
#include <windowsx.h> g"S+V#R  
#pragma comment(lib,"hook.lib") ZiYzsn  
#ifdef _DEBUG 0\@|M@X=  
#define new DEBUG_NEW C/Bx_j((  
#undef THIS_FILE ? M_SNv  
static char THIS_FILE[] = __FILE__; +Uq:sfj,  
#endif 1C=P#MU`  
#define IDM_SHELL WM_USER+1 FSs$ ] d;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &Ld8Z9IeFp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M) XQi/  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; m?$G(E5  
class CAboutDlg : public CDialog 4 GW[GT  
{ g}QTZT8  
 public: I>Fh*2  
  CAboutDlg(); a&Du5(r;!  
  // Dialog Data XF$]KA L0  
  //{{AFX_DATA(CAboutDlg) T k&9Klo  
  enum { IDD = IDD_ABOUTBOX }; %nf=[f  
  //}}AFX_DATA g8A{aHb1}  
  // ClassWizard generated virtual function overrides !13 /+ u  
  //{{AFX_VIRTUAL(CAboutDlg) u#k ,G`  
 protected: AiK4t-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BrMp_M  
  //}}AFX_VIRTUAL eh4"_t  
  // Implementation S@NhEc  
 protected: 3MJWCo-[  
  //{{AFX_MSG(CAboutDlg) 9= $,]M  
  //}}AFX_MSG =3dbw8I  
  DECLARE_MESSAGE_MAP() <|Eby!KXR  
}; |S`yXsg  
'xoE [0!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @k6}4O?{  
{ ?9@Af{b t2  
 //{{AFX_DATA_INIT(CAboutDlg) @i-@mxk6<  
 //}}AFX_DATA_INIT DeQ'U!?+N  
} %&+R":Bw  
.0W4Dp  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) L$c%u  
{ f?^Oy!1]  
 CDialog::DoDataExchange(pDX); y"p-8RVk{  
 //{{AFX_DATA_MAP(CAboutDlg) (A fbS=[  
 //}}AFX_DATA_MAP '4lT*KN7\  
} wf< `J/7u  
yPG\ &Bo  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )6 0f  
 //{{AFX_MSG_MAP(CAboutDlg) aDvO(C  
 // No message handlers yi-"hT`  
 //}}AFX_MSG_MAP A<X :K nl  
END_MESSAGE_MAP() j{Jc6U  
ZfCr"aL  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) gdFoTcHgO|  
: CDialog(CCaptureDlg::IDD, pParent) 8kM0  
{ r9a!,^}F  
 //{{AFX_DATA_INIT(CCaptureDlg) &t|V:_?/x  
  m_bControl = FALSE; AYu'ptDNr  
  m_bAlt = FALSE; G^@Jgx3n  
  m_bShift = FALSE; ?WtG|w  
  m_Path = _T("c:\\");  zn;Hs]G  
  m_Number = _T("0 picture captured."); $o$Ev@mi  
  nCount=0; A+1]Ql)$  
  bRegistered=FALSE; ~K$"PK s3  
  bTray=FALSE; 7  cP[o+  
 //}}AFX_DATA_INIT V -4*nV  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32  [Ro0eH  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); xgqv2s>L  
} uQtk|)T E  
<bXWkj  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) S]%U]  
{ Dw/Gha/  
 CDialog::DoDataExchange(pDX); \R>5F\ 0  
 //{{AFX_DATA_MAP(CCaptureDlg) xnuv4Z}]t  
  DDX_Control(pDX, IDC_KEY, m_Key); mc=! X  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); .Jat^iFj0  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Q()RO*9  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -1r & s  
  DDX_Text(pDX, IDC_PATH, m_Path); ji)4WG/1  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2DC cGKa"  
 //}}AFX_DATA_MAP o- QG& ]  
} K!D!b'|bb  
Pzm!`F^r}  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Q'Kik5I  
//{{AFX_MSG_MAP(CCaptureDlg) dIfs 8%kl  
 ON_WM_SYSCOMMAND() 6|>\&Y!Q  
 ON_WM_PAINT() 9H, &nET  
 ON_WM_QUERYDRAGICON() &G@-yQ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) KgTGxCH  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;ko[(eFN@  
 ON_BN_CLICKED(ID_CHANGE, OnChange) MLD>"W  
//}}AFX_MSG_MAP "kBqY+:Cn  
END_MESSAGE_MAP() P2Qyz}!wo  
r {B,uj"  
BOOL CCaptureDlg::OnInitDialog() 0.BUfuuh  
{ & kjwIg{  
 CDialog::OnInitDialog(); kGuk -P  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $sL|'ZMbS  
 ASSERT(IDM_ABOUTBOX < 0xF000); q>|[JJ*6_N  
 CMenu* pSysMenu = GetSystemMenu(FALSE); & A9A#It  
 if (pSysMenu != NULL) #C,f/PXfaB  
 { bu"68A;>  
  CString strAboutMenu; O *J_+6  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 7fW=5wc  
  if (!strAboutMenu.IsEmpty()) )Rhff$  
  { \abAPo  
   pSysMenu->AppendMenu(MF_SEPARATOR); Q(;B)  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); OBw`!G*w  
  } _[{:!?-?  
 } ,7fc41O3V  
 SetIcon(m_hIcon, TRUE); // Set big icon '=K of1  
 SetIcon(m_hIcon, FALSE); // Set small icon C/CfjRzd  
 m_Key.SetCurSel(0); #?$'nya*u  
 RegisterHotkey(); X# kjt )W  
 CMenu* pMenu=GetSystemMenu(FALSE); I~]Q55  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); (XG[_  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Q+!0)pG5#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .KU SNrs'  
 return TRUE; // return TRUE unless you set the focus to a control n:bB$Ai2  
} [6_Du6\h  
-Nlf~X  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Dd5xXs+c  
{ }rY?=I  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) :Hf0Qx6  
 { 4$?w D <  
  CAboutDlg dlgAbout; zOao&  
  dlgAbout.DoModal(); inPdV9  
 } =(|xU?OL  
 else zOiY0`=  
 { /\-2l+y>J  
  CDialog::OnSysCommand(nID, lParam); =,C9O  
 } 3u?`q%Y-e  
} y3KcM#[  
ra9cD"/J &  
void CCaptureDlg::OnPaint() =##s;zj(%  
{ i (%tHa37  
 if (IsIconic()) gaw4NZd)0  
 { KYkS6|A  
  CPaintDC dc(this); // device context for painting L*UV  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~ gfA](N  
  // Center icon in client rectangle o/dMm:TF  
  int cxIcon = GetSystemMetrics(SM_CXICON); W) 33;E/}  
  int cyIcon = GetSystemMetrics(SM_CYICON); K{ zCp6  
  CRect rect; 2GiUPtO&Gj  
  GetClientRect(&rect); G+hF [b44'  
  int x = (rect.Width() - cxIcon + 1) / 2; Q_QKm0!  
  int y = (rect.Height() - cyIcon + 1) / 2; iBKb/Oi6  
  // Draw the icon 0E?s>-b  
  dc.DrawIcon(x, y, m_hIcon); 62MRI    
 } @QVqpE<|  
 else &$b\=  
 { TDAWI_83-  
  CDialog::OnPaint(); .B 85!lCF  
 } P>{US1t  
} 'n l RY5@2  
&& DD  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3qAwBVWa  
{ eC>"my`  
 return (HCURSOR) m_hIcon; 8:P*z  
} Z p7yaz3y  
A[^qq UL'  
void CCaptureDlg::OnCancel() pwFU2}I  
{ FpdDIa  
 if(bTray) ]3O 4\o  
  DeleteIcon(); Wa[x`:cT?u  
  CDialog::OnCancel(); VDByj "%  
} atLV`U&t  
e}'#Xv  
void CCaptureDlg::OnAbout() ^])e[RN7?n  
{ zd*3R+>U'>  
 CAboutDlg dlg; $N}/1R^?r  
 dlg.DoModal(); 0^GbpSW{  
} $=PWT-GIR  
Qy=HrL]x  
void CCaptureDlg::OnBrowse() \Y!T>nWn)I  
{ lX98"}  
 CString str; ]a$Wxvgq  
 BROWSEINFO bi; [F/^J|VMV  
 char name[MAX_PATH]; ;dqk@@O"(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); JQ) 4}t  
 bi.hwndOwner=GetSafeHwnd(); JkSdLj  
 bi.pszDisplayName=name; \!+-4,CbZY  
 bi.lpszTitle="Select folder"; [ME}Cv`?<E  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; u\{qH!?t  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]Q6+e(:~ZH  
 if(idl==NULL) 3[0w+{ (Q  
  return; Yz&*PPx  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $?FS00p*|X  
 str.ReleaseBuffer(); ] vC=.&]  
 m_Path=str; 1Yc%0L(  
 if(str.GetAt(str.GetLength()-1)!='\\') hD nM+4D  
  m_Path+="\\"; _\ .  
 UpdateData(FALSE); <u/a`E?  
} lpl8h4d  
v!NB~"LQ  
void CCaptureDlg::SaveBmp() uP{; *E3?  
{ X}oj_zsy;^  
 CDC dc; rQ9*J   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); )!'n&UxPo$  
 CBitmap bm; )\{'fF  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2.[_t/T  
 int Height=GetSystemMetrics(SM_CYSCREEN); "| K f'/r  
 bm.CreateCompatibleBitmap(&dc,Width,Height); s1X]RXX&j  
 CDC tdc; 1s#yWQ   
 tdc.CreateCompatibleDC(&dc); n,t6v5>88  
 CBitmap*pOld=tdc.SelectObject(&bm); <,jAk4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ]>tq|R78  
 tdc.SelectObject(pOld); ;yF[2P ;  
 BITMAP btm; 0o=!j3RjH  
 bm.GetBitmap(&btm); cu[!D}tVU  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 5^)?mA  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #v.L$7O  
 BITMAPINFOHEADER bih; \'n$&PFe  
 bih.biBitCount=btm.bmBitsPixel; JNh=fvO2i  
 bih.biClrImportant=0; ^C!mCTL1N  
 bih.biClrUsed=0; K*_-5e  
 bih.biCompression=0; ]e^R@w  
 bih.biHeight=btm.bmHeight; : @'fpN  
 bih.biPlanes=1; p/r~n'g$  
 bih.biSize=sizeof(BITMAPINFOHEADER); {mNdL J  
 bih.biSizeImage=size; TE3*ktB{N  
 bih.biWidth=btm.bmWidth; (# JMB)  
 bih.biXPelsPerMeter=0; @Z?7E8(  
 bih.biYPelsPerMeter=0; 6fh{lx>  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); yZq?B  
 static int filecount=0; LO"_NeuL  
 CString name; B;VH`*+X  
 name.Format("pict%04d.bmp",filecount++); >&bv\R/  
 name=m_Path+name; A#<vG1  
 BITMAPFILEHEADER bfh; S8\+XJ  
 bfh.bfReserved1=bfh.bfReserved2=0; `SCy<w3$+[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); (~S<EUc$  
 bfh.bfSize=54+size; _1sP.0 t  
 bfh.bfOffBits=54; &k1/Z*/  
 CFile bf; r)VLf#3B  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ H{ZLk,  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); L >SZgmV+  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5v"Y\k+1  
  bf.WriteHuge(lpData,size); _-n Y2)  
  bf.Close(); Z;hyi'rPJ  
  nCount++; )AOPiC$jL  
 } ;t}'X[U  
 GlobalFreePtr(lpData); ] bIt@GB  
 if(nCount==1) brntE:  
  m_Number.Format("%d picture captured.",nCount); ~%`EeJwT  
 else |VK:2p^ u  
  m_Number.Format("%d pictures captured.",nCount); .N5'.3  
  UpdateData(FALSE); S#k{e72 *  
} d7E7f  
djUihcqA`  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) lqF>=15  
{ ~L~]QN\3  
 if(pMsg -> message == WM_KEYDOWN) u=%y  
 { o~= iy  
  if(pMsg -> wParam == VK_ESCAPE) s3seK6x'  
   return TRUE; !Q!&CG5l  
  if(pMsg -> wParam == VK_RETURN) i<mevL  
   return TRUE; 3c b[RQf  
 } =nzFd-P  
 return CDialog::PreTranslateMessage(pMsg); %*6RzJO6  
} sc%dh?m7  
`4LJ;KC(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;d4 y{  
{ cv= \g Z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ EJ G2^DSS  
  SaveBmp(); /9pbnzn  
  return FALSE; X<Z(]`i  
} _ \l HI  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ K5{{:NR$  
 CMenu pop; QP:9%f>=  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); .:8[wI_f  
 CMenu*pMenu=pop.GetSubMenu(0); mH)OB?+lq  
 pMenu->SetDefaultItem(ID_EXITICON); M+0x;53nz  
 CPoint pt; wazP,9W?  
 GetCursorPos(&pt); pajy#0 U  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); G.Tpl-m  
 if(id==ID_EXITICON) !3h{lE B  
  DeleteIcon(); Je^Y&a~  
 else if(id==ID_EXIT) vevf[eO-  
  OnCancel(); 4f!dY o4L  
 return FALSE; QWw"K$l  
} ;u,rtEMy;  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ehE-SrkU'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -,^WaB7u\  
 AddIcon(); 45) D+  
 return res; };rm3;~ eg  
} )6=gooe]  
GMdI0jaG#  
void CCaptureDlg::AddIcon() AF GwT%ZD  
{ KSc~GP _  
 NOTIFYICONDATA data; j{)~QD?  
 data.cbSize=sizeof(NOTIFYICONDATA); jB!W2~Z  
 CString tip; Y''6NGf  
 tip.LoadString(IDS_ICONTIP); a%E8(ms37y  
 data.hIcon=GetIcon(0); ENq"mwV|  
 data.hWnd=GetSafeHwnd(); r{S=Z~J  
 strcpy(data.szTip,tip); =UNT.]  
 data.uCallbackMessage=IDM_SHELL; )pS8{c)E  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; g2=}G<*0  
 data.uID=98; !lhFKb;  
 Shell_NotifyIcon(NIM_ADD,&data); <GaT|Hhc=  
 ShowWindow(SW_HIDE); T`?n,'!(  
 bTray=TRUE; @^!\d#/M  
} \!<"7=(J{4  
b/nOdFO@  
void CCaptureDlg::DeleteIcon() Q2"WV  
{ gLD{1-v  
 NOTIFYICONDATA data; f*<ps o  
 data.cbSize=sizeof(NOTIFYICONDATA); pDOM:lGya  
 data.hWnd=GetSafeHwnd(); oIb) Rq!m  
 data.uID=98; Y 9i][  
 Shell_NotifyIcon(NIM_DELETE,&data); < eQ[kM  
 ShowWindow(SW_SHOW); y\#o2PVmY  
 SetForegroundWindow(); nhewDDu  
 ShowWindow(SW_SHOWNORMAL); j&CZ=?K^c  
 bTray=FALSE; q`^3ov^</  
} WYLX?x  
>)^N J2Fd  
void CCaptureDlg::OnChange() < Y>3  
{ ,eXFN?CB  
 RegisterHotkey(); (@q3^)I4  
} )[jy[[K(  
g/#~N~&  
BOOL CCaptureDlg::RegisterHotkey() YBvd q1  
{ sKd)BA0`  
 UpdateData(); bnr|Y!T}Bi  
 UCHAR mask=0; s@~/x5jwCs  
 UCHAR key=0; hJ[UB  
 if(m_bControl) N@()F&e  
  mask|=4; *H" aOT^{  
 if(m_bAlt) Pbe7SRdr^  
  mask|=2; <tuS,.  
 if(m_bShift) Dx3%K S  
  mask|=1; JNBT^=x  
  key=Key_Table[m_Key.GetCurSel()]; R hio7C  
 if(bRegistered){ ~^7r?<aKc  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Ek ZjO Ci  
  bRegistered=FALSE; v9rVpYc"  
 }  F\LsI;G  
 cMask=mask; TatMf;?h&  
 cKey=key; KO&:06V{  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); l.oBcg[  
 return bRegistered; -B 9S}NPo  
} q- :4=vkn  
yW("G-Nm  
  四、小结 d}-'<Z#G  
xNX'~B^4d  
  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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