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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: u}|%@=xn  
  3QOUU,Dt$  
  一、实现方法 A?T<",bO  
FsGlJ   
  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: 79yd&5#e?  
5+jf/}t A  
#pragma data_seg("shareddata") [ dE.[  
HHOOK hHook =NULL; //钩子句柄 *cg( ?yg  
UINT nHookCount =0; //挂接的程序数目 S"hTE7`   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 S$^ RbI  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 GzTq5uU&  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey X*7\lf2  
static int KeyCount =0; @AYo-gf  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 =?(~aV  
#pragma data_seg() Mf#83 <&K  
UYtuED  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 aRJ>6Q}  
?P7]u>H  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: <(e8sNe  
|J~eLh[d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR CCGV~e+  
cKey,UCHAR cMask) ACK1@eF  
{ }V|{lvt.  
 BOOL bAdded=FALSE; sW^a`VM  
 for(int index=0;index<MAX_KEY;index++){ rqlc2m,<-p  
  if(hCallWnd[index]==0){ ^U8r0]9  
   hCallWnd[index]=hWnd; ^:jN3@ Q%  
   HotKey[index]=cKey; yRYWch  
   HotKeyMask[index]=cMask; M#@aB"@J>  
   bAdded=TRUE;  l"zUv  
   KeyCount++; /)rkiwp  
   break; WWZ9._  
  } VNtPKtx\  
 } ,[nm_^R*\  
 return bAdded; S-nlr@w8  
} :9|W#d{o  
//删除热键 j` /&r*zNq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [;b=A  
{ kV Rn`n0  
 BOOL bRemoved=FALSE; /+3a n9h  
 for(int index=0;index<MAX_KEY;index++){ .M4IGOvOS  
  if(hCallWnd[index]==hWnd){ 5b6s4ZyV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,s^<X85gp\  
    hCallWnd[index]=NULL; 6dEyv99  
    HotKey[index]=0; PZD>U)M  
    HotKeyMask[index]=0; rB%$;<`/  
    bRemoved=TRUE; =N|kn<h4  
    KeyCount--; ^SfS~G Q  
    break; jAsO8  
   } t%r :4,  
  } ?oiKVL"7  
 } '~wpP=<yyF  
 return bRemoved; :Ld!mRZF  
} VZIR4J[\.  
www`=)A;  
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  DLL中的钩子函数如下: 1[;@AE2Y  
YO:&;K%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) jec:i-,  
{ `4CWE_k  
 BOOL bProcessed=FALSE; V8z`qEPM  
 if(HC_ACTION==nCode) I}Xg &-L  
 { vVs#^"-nW  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /LQ:Sv7  
   switch(wParam) $YG1z  
   {  zG c[Z3N  
    case VK_MENU: ?&l)W~S  
     MaskBits&=~ALTBIT; 7nHTlI1 b  
     break; g9my=gY  
    case VK_CONTROL: y$tX-9U  
     MaskBits&=~CTRLBIT; 4o9$bv  
     break; I 2HT2c$  
    case VK_SHIFT: Cj;/Uhs  
     MaskBits&=~SHIFTBIT; r FL$QC2  
     break; UlQQP^Na  
    default: //judge the key and send message .%0ne:5  
     break; Z]:BYX'  
   } u&TdWZe  
   for(int index=0;index<MAX_KEY;index++){ $X+u={]  
    if(hCallWnd[index]==NULL) u:` y]  
     continue; g3?U#7i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ? 4)v`*  
    { r[Zq3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); q?~Rnv  
     bProcessed=TRUE; ZcryAm:I  
    } $~'Tf>e  
   } ?Cci:Lin  
  } O(OmGu4%  
  else if((lParam&0xc000ffff)==1){ //有键按下 y?N Nz0  
   switch(wParam) LN!W(n(  
   { /b.oEGqZX  
    case VK_MENU: Y&'8VdW  
     MaskBits|=ALTBIT; 8 HoP( +?  
     break; qvLDfN  
    case VK_CONTROL: C 7n Kk/r  
     MaskBits|=CTRLBIT; !g 0cC.'  
     break; XSB8z   
    case VK_SHIFT: ?(im+2  
     MaskBits|=SHIFTBIT; amB@N6*  
     break; KC&`x |  
    default: //judge the key and send message +|C[-W7Sw  
     break; :J(sXKr[C  
   } @PcCiGZ  
   for(int index=0;index<MAX_KEY;index++){ nJVp.*S  
    if(hCallWnd[index]==NULL) {(vOt'  
     continue; ,{j4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +*t|yKO>[  
    { TV{)n'aA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t^@T`2jL  
     bProcessed=TRUE; c#q"\"  
    } 6d{j0?mM  
   } B2hfD-h,>  
  } P&t;WPZ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Dc FCKji  
   for(int index=0;index<MAX_KEY;index++){ R^Bk]  
    if(hCallWnd[index]==NULL) } 21j  
     continue; .u< U:*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) '>^Xqn  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "r-l8r,  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 vO$ra5Z  
   } 7>x;B  
  } A'DVJ9%xB  
 } u3wL<$2[8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); X7e/:._SAH  
} J#7(]!;F  
R[ yL _>  
  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: z Z%/W)t  
)bYez  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H%Y%fQ ~^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dB`b9)Tk0z  
YMAQ+A!  
  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: ^"tqdeCb=  
I>((o`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g[!Cj,  
{ gNa#|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) oO:LG%q  
 { yH(V&Tv  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 [~?M/QI9  
  SaveBmp(); ?0npEz|  
  return FALSE; )Z:m)k>r;  
 } ~.Q4c*_b  
 …… //其它处理及默认处理 h3h8lt_ |  
} P{lh)m>  
nO@+s F  
kukaim>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。 sfC@*Y2XT  
+{xG<Wkltz  
  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。 2k3 z'RLG  
b]dxlj} <  
  二、编程步骤 s, -*q}  
EVSK8T,  
  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"; |!5@xs*T  
4qBY% 1  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; AijUs*n 2  
:bw6k  
  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; 3"B+xbe=  
' C6:e?R  
  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; Y~GUR&ww0n  
8D T@h8tA  
  5、 添加代码,编译运行程序。 ?zE<  
.jum "va%  
三、程序代码 -4`sqv ]  
QX/]gX  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 3YRB I|XO  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ;@'0T4Z&l  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ dM gbW<uAu  
#if _MSC_VER > 1000 WH;xq^  
#pragma once h*l4Y!7  
#endif // _MSC_VER > 1000 g _x\T+=  
#ifndef __AFXWIN_H__ XbXgU#%  
#error include 'stdafx.h' before including this file for PCH *cy.*@d  
#endif .9I_N G  
#include "resource.h" // main symbols r1hD %a  
class CHookApp : public CWinApp ZE ^u.>5  
{ G,/Gq+WX  
 public: eu=|t&FKk  
  CHookApp(); q"p#H8  
  // Overrides !pV<n  
  // ClassWizard generated virtual function overrides 1G_xP^H!  
  //{{AFX_VIRTUAL(CHookApp) a}GAB@YI  
 public: Vd[  2u  
  virtual BOOL InitInstance(); KPg[-d  
  virtual int ExitInstance(); \ >(zunL  
  //}}AFX_VIRTUAL FP@ A;/c  
  //{{AFX_MSG(CHookApp) @d P~X  
  // NOTE - the ClassWizard will add and remove member functions here. Wb'*lT0=  
  // DO NOT EDIT what you see in these blocks of generated code ! 1YFAr}M  
  //}}AFX_MSG x/[8Wi,yB  
  DECLARE_MESSAGE_MAP() K5+!(5V~  
}; %)dI2 J^Xf  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); :3 PGf  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7ozYq_ $  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TwwIt5_fN  
BOOL InitHotkey(); 1+FYjh!2t  
BOOL UnInit(); ]t7ClT)n!  
#endif w=gQ3j#s  
U!_sh<  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 7~lB}$L  
#include "stdafx.h" NB3/A"}"02  
#include "hook.h" `lvh\[3^  
#include <windowsx.h> s V&`0N  
#ifdef _DEBUG &8juS,b  
#define new DEBUG_NEW 78^Y;2 P]W  
#undef THIS_FILE 4=UI3 2v3  
static char THIS_FILE[] = __FILE__; w8U2y/:>  
#endif <xC: Ant  
#define MAX_KEY 100 Fv;u1Atiw  
#define CTRLBIT 0x04 vFR 1UPF  
#define ALTBIT 0x02 #[C< J#;  
#define SHIFTBIT 0x01 =sL(^UISl  
#pragma data_seg("shareddata") 6O%=G3I  
HHOOK hHook =NULL; cy9N:MR(c  
UINT nHookCount =0; cyDiA(ot&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~S! L!qY  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -aA<.+  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey my=*zziN  
static int KeyCount =0; ?! _u,sT  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift YlG; A\]k  
#pragma data_seg() E#8J+7  
HINSTANCE hins; .!!79 6hS  
void VerifyWindow(); q^u6f?B  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) -.^@9 a>  
//{{AFX_MSG_MAP(CHookApp) A"`L~|&  
// NOTE - the ClassWizard will add and remove mapping macros here. M3)v-"  
// DO NOT EDIT what you see in these blocks of generated code! R<_mK33hd  
//}}AFX_MSG_MAP h#vL5At  
END_MESSAGE_MAP() j}i,G!-u  
d|R HG  
CHookApp::CHookApp() D1"1MUSod  
{ S|s3}]g9  
 // TODO: add construction code here, jw%fN!?  
 // Place all significant initialization in InitInstance 5ZZd.9ZgM  
} l85O-g}M  
mMn2(  
CHookApp theApp; bbM4A! N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .Y+mwvLpRG  
{ Cq TH!'N  
 BOOL bProcessed=FALSE; ]w5ji  
 if(HC_ACTION==nCode) 1 VPg`+o  
 { U<1}I.hDJ  
  if((lParam&0xc0000000)==0xc0000000){// Key up +'!h-x1y~  
   switch(wParam) :17ee  
   { gCjH%=s  
    case VK_MENU: iJ5e1R8tN  
     MaskBits&=~ALTBIT; UeFtzty,a  
     break; +k# mvPq  
    case VK_CONTROL: k0gJ('zah  
     MaskBits&=~CTRLBIT; Vj#%B.#Zbf  
     break; &8R-C[A  
    case VK_SHIFT: (*LTq C  
     MaskBits&=~SHIFTBIT; (D:KqGqoT  
     break; ]Fb8.q5(Y  
    default: //judge the key and send message B/kcb(5v  
     break; &3!i@2d;3f  
   } "4J?JR  
   for(int index=0;index<MAX_KEY;index++){ wOD/Z8  
    if(hCallWnd[index]==NULL) X%RQB$  
     continue; PEMxoe<+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |p'_k(z}  
    { lqhHbB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  /<(R  
     bProcessed=TRUE; k9. u[y.  
    } 6nM rO$i0k  
   } *g}vT8w'}  
  } [N'r3  
  else if((lParam&0xc000ffff)==1){ //Key down d#x8O4S%i2  
   switch(wParam) nhB^Xr=  
   { 37.) @  
    case VK_MENU: y}3 `~a  
     MaskBits|=ALTBIT; yYVW"m  
     break; }])G Q@  
    case VK_CONTROL: O~7p^i}  
     MaskBits|=CTRLBIT; >$d d 9|[  
     break; J@=!w[v+  
    case VK_SHIFT: $`cy'ZaF  
     MaskBits|=SHIFTBIT; s|Imz<IE  
     break; {X{01j};8  
    default: //judge the key and send message %Z-TbOX  
     break; e7)>U!9c9  
   } z:@d@\$?  
   for(int index=0;index<MAX_KEY;index++) +]aD^N9['  
   { w*]_FqE  
    if(hCallWnd[index]==NULL) @]}Qh;a~  
     continue; 3hp tP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P}w^9=;S  
    { $Qx(aWE0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); M%nZu{  
     bProcessed=TRUE; V}3~7(   
    } 6%Cna0x:&  
   } $~;6hnr m  
  } 6 d{D3e[p^  
  if(!bProcessed){ Y9lbf_51  
   for(int index=0;index<MAX_KEY;index++){ *,Aa9wa{  
    if(hCallWnd[index]==NULL) fSgGQ D4  
     continue; 0  /D5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) IJL^dXCu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [kU[}FT  
   } gwkZk-f\p  
  } S1 R #]  
 } g[uE@Gaj&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); x<)!$cg  
} ?CL z@u~  
_&8KB1~  
BOOL InitHotkey()  )^QG-IM  
{ F ~11 _  
 if(hHook!=NULL){ TLR Lng  
  nHookCount++; ul]m>W  
  return TRUE; $)WH^Ir~  
 } 'PxL^  
 else }K qw\]`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); A=@V LU4%  
  if(hHook!=NULL) 'RN"yMv7l  
   nHookCount++; }&'yt97+  
  return (hHook!=NULL); |\{J` 5gr  
} )aO!cQ{s  
BOOL UnInit() \dQ2[Ek  
{ [{Klv&>_/  
 if(nHookCount>1){ o9(#KC?3  
  nHookCount--; _YD<Q@  
  return TRUE; +eH=;8  
 } (\AszLW  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +L<w."WG  
 if(unhooked==TRUE){ 9h)P8B.>M  
  nHookCount=0; ).@)t:uNa  
  hHook=NULL; PT= 2LZ  
 } ! Dhfr{  
 return unhooked; Xl '\krz  
} iI/'! 85  
r.W"@vc>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1&x0+~G  
{ %'p|JS  
 BOOL bAdded=FALSE; Sd/d [  
 for(int index=0;index<MAX_KEY;index++){ LqH?3):  
  if(hCallWnd[index]==0){ &nY2u-Q  
   hCallWnd[index]=hWnd; !'UsC6Y4  
   HotKey[index]=cKey; e>s.mH6A  
   HotKeyMask[index]=cMask; ^AC+nko*  
   bAdded=TRUE; NJz*N%VWD  
   KeyCount++; WA)lk>(+  
   break; \&|w;  
  } vb4G_X0S  
 } ABS BtH ?  
 return bAdded; e^ K=8IW  
} Yc( )'6  
A?<"^<A^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) gJ}'O4*b  
{ ;L/T}!Dx  
 BOOL bRemoved=FALSE; m'vOFP)'  
 for(int index=0;index<MAX_KEY;index++){  I$sm5oL  
  if(hCallWnd[index]==hWnd){  MYW 4@#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ OYCFx2{  
    hCallWnd[index]=NULL; ,4?|}xg  
    HotKey[index]=0; hJL0M!  
    HotKeyMask[index]=0; EJiF_  
    bRemoved=TRUE; U#^:f7-$.  
    KeyCount--; :8/M6-EK  
    break; OW5|oG  
   } \c`r9H^v{  
  } Z6HkQ=A64  
 } $DMu~wwfG  
 return bRemoved; _jI)!rfb  
} >0G}, S  
$y |6<  
void VerifyWindow() s(DaPhL6Qm  
{ _J$p <  
 for(int i=0;i<MAX_KEY;i++){ 6T aT_29  
  if(hCallWnd!=NULL){ mfi'>o#  
   if(!IsWindow(hCallWnd)){ ,t,65@3+b  
    hCallWnd=NULL; K,T]Fuy  
    HotKey=0; MLDg).5  
    HotKeyMask=0; nCmrt*&}  
    KeyCount--; d~oWu [F*  
   } Ns] 9-D  
  } b J5z??  
 } bTYP{x~ y  
} 0 GLB3I >  
(VF4]  
BOOL CHookApp::InitInstance() jjlCi<9CQ^  
{ ;`Ch2b1+  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); $/sZYsN~T  
 hins=AfxGetInstanceHandle(); Q\th8/ /  
 InitHotkey(); 'm.XmVZL%  
 return CWinApp::InitInstance(); t7`Pw33#kY  
} _ O71r}4  
2ZFK jj  
int CHookApp::ExitInstance() T<~[vjA  
{ iZqFVr&JF  
 VerifyWindow(); o+WrIAR  
 UnInit(); Rhxm)5+  
 return CWinApp::ExitInstance(); loVvr"&g  
} XzwQ,+IAr  
Zvw3C%In  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9MlfZsby  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \7?MUa.4  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ AZ@Zo'  
#if _MSC_VER > 1000 Bwvc@(3v  
#pragma once 0BZOr-i  
#endif // _MSC_VER > 1000 LR?#H)$  
wEn&zZjx  
class CCaptureDlg : public CDialog ktJLp Z<0O  
{ (N>ew)Ke  
 // Construction CX2q7azG  
 public: :JG}%  
  BOOL bTray; *j;r|P;g  
  BOOL bRegistered; YuW\GSV00  
  BOOL RegisterHotkey(); g?Ty5~:lq  
  UCHAR cKey; n \NDi22  
  UCHAR cMask; xaaxj  
  void DeleteIcon(); 5nw9zW :'  
  void AddIcon(); [ ESQD5&  
  UINT nCount; p{QKj3ov  
  void SaveBmp(); u>Kvub  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?ew]i'9(  
  // Dialog Data N=Yi :+  
  //{{AFX_DATA(CCaptureDlg) }U1{&4Ph  
  enum { IDD = IDD_CAPTURE_DIALOG }; WmBnc#>gK  
  CComboBox m_Key;  x a,LV  
  BOOL m_bControl; ]=$ ay0HC  
  BOOL m_bAlt; S6:gow(wU  
  BOOL m_bShift; xqZ%c/I3q  
  CString m_Path; |?b"my$g$  
  CString m_Number; s+t eYL#Zi  
  //}}AFX_DATA F4l6PGxF&\  
  // ClassWizard generated virtual function overrides QU;C*}0Zl  
  //{{AFX_VIRTUAL(CCaptureDlg) K&oO+G^f  
 public: K%@SS8!oy  
  virtual BOOL PreTranslateMessage(MSG* pMsg); DcM+K@1E4^  
 protected: `SbX`a0p2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O&RHCR-\  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 1j-i nj`  
  //}}AFX_VIRTUAL h$h`XBVZe;  
  // Implementation /]>{"sS(  
 protected: +Rd{ ?)2~  
  HICON m_hIcon; 25KZe s)  
  // Generated message map functions U?C{.@#w  
  //{{AFX_MSG(CCaptureDlg) O/"&?)[v  
  virtual BOOL OnInitDialog(); / 1GZN *I  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); FAGVpO[  
  afx_msg void OnPaint(); U9OF0=g  
  afx_msg HCURSOR OnQueryDragIcon(); (G;*B<|A  
  virtual void OnCancel(); R-|]GqS}L  
  afx_msg void OnAbout(); P"VLGa  
  afx_msg void OnBrowse(); )y Y;%  
  afx_msg void OnChange(); a"N_zGf2$  
 //}}AFX_MSG Vp94mi#L }  
 DECLARE_MESSAGE_MAP() 1T`"/*!  
}; =l_"M  
#endif ~1!kU 4  
9_dsiM7CT  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :CHd\."%+1  
#include "stdafx.h" lO@Ba;x  
#include "Capture.h" NP/2gjp  
#include "CaptureDlg.h" 51usiOq  
#include <windowsx.h> :S2MS{>Mo  
#pragma comment(lib,"hook.lib") L zy|<:K+$  
#ifdef _DEBUG MM7gMAA.mz  
#define new DEBUG_NEW o8"xoXK5xf  
#undef THIS_FILE 4x >e7Kf  
static char THIS_FILE[] = __FILE__; 3xY]Lqwv  
#endif _P+|tW1  
#define IDM_SHELL WM_USER+1 F`3As 9b:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f>PU# D@B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7 {<lH%Tn  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]d(}b>gR~(  
class CAboutDlg : public CDialog $SgD| 9  
{ p.olXP  
 public: ] lTfi0}g_  
  CAboutDlg(); YiMecu  
  // Dialog Data \rO>F E  
  //{{AFX_DATA(CAboutDlg) J'v|^`bE  
  enum { IDD = IDD_ABOUTBOX }; 3E9j%sYk  
  //}}AFX_DATA CAO{$<M5m  
  // ClassWizard generated virtual function overrides MQu6Tm H  
  //{{AFX_VIRTUAL(CAboutDlg) vnpX-c  
 protected: /y@iaptC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,B!Qv3bn  
  //}}AFX_VIRTUAL Ss}0.5Bq  
  // Implementation b@Cvs4  
 protected: ^5F/=TtE G  
  //{{AFX_MSG(CAboutDlg) i>}z$'X  
  //}}AFX_MSG )I9(WVx!]  
  DECLARE_MESSAGE_MAP() g?sFmD  
}; Aed"J5[a  
{F[Xe_=#"  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %m`QnRX?D  
{ ij^!TY[0  
 //{{AFX_DATA_INIT(CAboutDlg) -Ox HQ  
 //}}AFX_DATA_INIT a#=-Aj-  
} =7> ~u  
l{g( z !  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >kT~X ,o  
{ c i>=45@J  
 CDialog::DoDataExchange(pDX); '@P[fSQ  
 //{{AFX_DATA_MAP(CAboutDlg) Ckp=d  
 //}}AFX_DATA_MAP Qa+gtGtJ  
} UQ?8dw:E~  
?HTwTi 5!)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) /|f]L9)2<  
 //{{AFX_MSG_MAP(CAboutDlg) e^TF.D?RS  
 // No message handlers +V^_ksi\  
 //}}AFX_MSG_MAP f ;JSP  
END_MESSAGE_MAP() RCr:2 Iz  
i :72FVo  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8!fw Xm  
: CDialog(CCaptureDlg::IDD, pParent) ,5 ,4Qf7  
{ 0XNb@ogo  
 //{{AFX_DATA_INIT(CCaptureDlg) &2J|v#$F  
  m_bControl = FALSE; :W"ITY(  
  m_bAlt = FALSE; 2)YLs5>W%  
  m_bShift = FALSE; DFMWgBL  
  m_Path = _T("c:\\"); ua-p^X`w  
  m_Number = _T("0 picture captured."); y C#{nUdw  
  nCount=0; 511q\w M  
  bRegistered=FALSE; Heu@{t.[!D  
  bTray=FALSE; xh$[E&2u  
 //}}AFX_DATA_INIT ~c"c9s+o  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7_,X9^z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Z)~ 2{)  
} 2NM} u\%c/  
&V$R@~x  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @,vSRns  
{  T7`Jtqf  
 CDialog::DoDataExchange(pDX); v.MWO]L  
 //{{AFX_DATA_MAP(CCaptureDlg) ;Xns9  
  DDX_Control(pDX, IDC_KEY, m_Key); tti.-  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); $6N. ykJ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); +]X^bB[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); p*Cbe\  
  DDX_Text(pDX, IDC_PATH, m_Path); U<x3=P  
  DDX_Text(pDX, IDC_NUMBER, m_Number); RD^o&VXO  
 //}}AFX_DATA_MAP 2#!D"F  
} 9^n ]qg^  
pFh2@O  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D? ($R9t  
//{{AFX_MSG_MAP(CCaptureDlg) R\^tr  
 ON_WM_SYSCOMMAND() [(XKqiSV  
 ON_WM_PAINT() X%sc:V  
 ON_WM_QUERYDRAGICON() '4iu0ie>D  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Jx]`!dP3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) U\N`[k.F  
 ON_BN_CLICKED(ID_CHANGE, OnChange) bZ)Jgz  
//}}AFX_MSG_MAP o9CB ,c7]  
END_MESSAGE_MAP() (DU{o\=  
6 S8#[b  
BOOL CCaptureDlg::OnInitDialog() z3,z&Ra  
{ %PpB$  
 CDialog::OnInitDialog(); %/7`G-a.B  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); qXW 5_iX  
 ASSERT(IDM_ABOUTBOX < 0xF000); P;GUGG*W  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .Kx5Kh {  
 if (pSysMenu != NULL) 0(n/hJ  
 { btOC\bUMfD  
  CString strAboutMenu; N^ )OlH  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ZHT.+X:_  
  if (!strAboutMenu.IsEmpty()) xAI<<[-  
  { <}evOw2  
   pSysMenu->AppendMenu(MF_SEPARATOR); ty ~U~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ^t"\PpmK<d  
  } <m!\Ma  
 } @m6E*2Gg  
 SetIcon(m_hIcon, TRUE); // Set big icon +.=a R<Q  
 SetIcon(m_hIcon, FALSE); // Set small icon kciH  
 m_Key.SetCurSel(0); 28-@Ga4  
 RegisterHotkey(); q(C+D%xB  
 CMenu* pMenu=GetSystemMenu(FALSE); ev>: 3_ s  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &\A$Rj)  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); F[lHG,g-  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?w.Yx$Z"  
 return TRUE; // return TRUE unless you set the focus to a control : v]< h  
} 6i%)'dl  
_$\T;m>'A  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ?@ O[$9y  
{ z;-2xD0&U[  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) P _9O8"W  
 { KF.?b]  
  CAboutDlg dlgAbout; $ysC)5q.  
  dlgAbout.DoModal(); iVD9MHT4  
 } ;fuy}q8@7  
 else hod|o1C&  
 { #8'%CUF*<8  
  CDialog::OnSysCommand(nID, lParam); OHB!ec6W  
 } &{$\]sv  
} {_ocW@@  
J4<- C\=4  
void CCaptureDlg::OnPaint()  H='`#l1  
{ B;EdLs}  
 if (IsIconic()) TR#5V@e.m  
 { K jLj  
  CPaintDC dc(this); // device context for painting +m"iJW0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QDU^yVa_  
  // Center icon in client rectangle 7%X$6N-X  
  int cxIcon = GetSystemMetrics(SM_CXICON);  #/n\C  
  int cyIcon = GetSystemMetrics(SM_CYICON); |XQ!xFB  
  CRect rect; j0Q ;OKu  
  GetClientRect(&rect); yd2ouCUV  
  int x = (rect.Width() - cxIcon + 1) / 2; 8g<3J-7Mm  
  int y = (rect.Height() - cyIcon + 1) / 2; ^ H'|iju  
  // Draw the icon $Uzc  
  dc.DrawIcon(x, y, m_hIcon); @r#>-p  
 } Lm8 cY  
 else )ZT&V I  
 { JV@>dK8  
  CDialog::OnPaint(); N-suBRnW  
 } sYvO"|  
} @+\OoOK<L  
e%8K A#DX  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3o6N&bQ b  
{ Qq5)|m  
 return (HCURSOR) m_hIcon; ]R0^ }sI  
} f F?=W  
7[Y<5T]  
void CCaptureDlg::OnCancel() )=~1m85+5B  
{ SwQb"  
 if(bTray) TK'(\[E  
  DeleteIcon(); t&ngOF  
  CDialog::OnCancel(); E_FseR6  
} TN&1C8xr  
*NDzU%X8  
void CCaptureDlg::OnAbout() ^58'*13ZL  
{ ) ><{A  
 CAboutDlg dlg; ) ~X\W\  
 dlg.DoModal(); % nJ'r?+h  
} 07CGHAxJ`  
U:ZklDW  
void CCaptureDlg::OnBrowse() #\w~(Nm-  
{ Rf7py)  
 CString str; ^}9Aq $R  
 BROWSEINFO bi; [~ fJ/  
 char name[MAX_PATH]; vQztD _bX%  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,rQznE1e  
 bi.hwndOwner=GetSafeHwnd(); \ ddbqg?`  
 bi.pszDisplayName=name; *&LVn)@[`  
 bi.lpszTitle="Select folder"; (ZDRjBth[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; xZBmQ:s',S  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); e%"L79Of6)  
 if(idl==NULL) ceAK;v o  
  return; lv,<[Hw1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); < jfi"SJu  
 str.ReleaseBuffer(); 2U i)'0  
 m_Path=str; {4UlJ,Z.n  
 if(str.GetAt(str.GetLength()-1)!='\\') x2;92I{5C,  
  m_Path+="\\"; RoP z?,u  
 UpdateData(FALSE); 6Vi #O^>  
} 9;kWuP>k4u  
'R= r9_%  
void CCaptureDlg::SaveBmp() -]HO8}-Rjs  
{ !<@Zf4m  
 CDC dc; 6 :J @  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); jRzR`>5  
 CBitmap bm; .BZw7 YV  
 int Width=GetSystemMetrics(SM_CXSCREEN); (1*?2u*j  
 int Height=GetSystemMetrics(SM_CYSCREEN); v@[MX- ,8  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Z{ &PKS  
 CDC tdc; ^BW V6  
 tdc.CreateCompatibleDC(&dc); J7$5<  
 CBitmap*pOld=tdc.SelectObject(&bm); @r'8<6hVO  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); gZ:)l@ Wu  
 tdc.SelectObject(pOld); P5kkaLzG  
 BITMAP btm; db4Ol=  
 bm.GetBitmap(&btm); L Ktr>u  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; pz~AsF  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )N<>L/R  
 BITMAPINFOHEADER bih; g;Bq#/w  
 bih.biBitCount=btm.bmBitsPixel; #N wlKZ-  
 bih.biClrImportant=0; Sw>AgES  
 bih.biClrUsed=0; ewD61Y8-  
 bih.biCompression=0; "C%;9_ig$  
 bih.biHeight=btm.bmHeight; n~k;9`  
 bih.biPlanes=1; (yn!~El3  
 bih.biSize=sizeof(BITMAPINFOHEADER); L3'o2@$  
 bih.biSizeImage=size; IKH#[jW'IB  
 bih.biWidth=btm.bmWidth; 5Tkh6s  
 bih.biXPelsPerMeter=0; =]E;wWC  
 bih.biYPelsPerMeter=0; j?#S M!f  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); e$fxC-sZ  
 static int filecount=0; c(i-~_  
 CString name; s9zdg"c'  
 name.Format("pict%04d.bmp",filecount++); 0O|T\E8 e  
 name=m_Path+name; e%o6s+"  
 BITMAPFILEHEADER bfh; >DpnIWn  
 bfh.bfReserved1=bfh.bfReserved2=0; rQ LNo,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); pO4}6\1\  
 bfh.bfSize=54+size; ?E=&LAI#  
 bfh.bfOffBits=54; 3T%WfS+  
 CFile bf; aa8WRf  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /&Khk #  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 8tY],  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); rer=o S  
  bf.WriteHuge(lpData,size); W_ngB[  
  bf.Close(); +(QGlRd  
  nCount++; A7 E*w  
 } P10`X&  
 GlobalFreePtr(lpData); }2-{4JIq}  
 if(nCount==1) 2>_6b>9]  
  m_Number.Format("%d picture captured.",nCount); 7JQ5OC3  
 else UXnd~DA  
  m_Number.Format("%d pictures captured.",nCount); z{7&=$  
  UpdateData(FALSE); Y6,< j|  
} p (:\)HP)R  
8(\Az5%  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [89#8|+  
{ (Rve<n6{A  
 if(pMsg -> message == WM_KEYDOWN) ; P&K a  
 { W:ih#YW_F  
  if(pMsg -> wParam == VK_ESCAPE) %DbL|;z1  
   return TRUE; y!h$Z6.  
  if(pMsg -> wParam == VK_RETURN) xzbyar<  
   return TRUE; OIe {Sx{y  
 } )UO:J7K  
 return CDialog::PreTranslateMessage(pMsg); ==l p\  
} YR=<xn;m.  
cL7je  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) H*?U@>UU  
{ 80x %wCY`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ EL;IrtU  
  SaveBmp(); w$u=_  
  return FALSE; Z;P[)q  
} k^:$ETW2 D  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ JnlM0jc]`  
 CMenu pop; &>ii2% 4  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !LVWggk1  
 CMenu*pMenu=pop.GetSubMenu(0); P*BA  
 pMenu->SetDefaultItem(ID_EXITICON); kVCS FF*  
 CPoint pt; D\jRF-z  
 GetCursorPos(&pt); k9vr6We'  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  I QS|  
 if(id==ID_EXITICON) lc,{0$ 1<  
  DeleteIcon(); ={o>g '  
 else if(id==ID_EXIT) !vHnMY~AG  
  OnCancel(); <=l!~~%  
 return FALSE; qH: ` O%,  
} \f}S Hh  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &HNJ '  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4/&Us  
 AddIcon(); ><mZOTn e;  
 return res; TxoMCN?7c  
} be|k"s|6)  
xa[<k >r3  
void CCaptureDlg::AddIcon() (_^g:>)Cs  
{ &.y:QVR,!  
 NOTIFYICONDATA data; BuCU_/H  
 data.cbSize=sizeof(NOTIFYICONDATA); MMqkNe  
 CString tip; ZT5t~5W  
 tip.LoadString(IDS_ICONTIP); Xp[[ xV|  
 data.hIcon=GetIcon(0); eu@-v"=w  
 data.hWnd=GetSafeHwnd(); O5CIK}A  
 strcpy(data.szTip,tip); L=O,OS+  
 data.uCallbackMessage=IDM_SHELL; ;]D@KxO$dJ  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #'^!@+)  
 data.uID=98; tV<}!~0,*  
 Shell_NotifyIcon(NIM_ADD,&data); KwndY,QD  
 ShowWindow(SW_HIDE); gYn1-/Z>I  
 bTray=TRUE; Ol`/r@s  
} Ek~Qp9B  
2asA]sY  
void CCaptureDlg::DeleteIcon() Ok/~E  
{ Am'5|  
 NOTIFYICONDATA data; EDcR:Dw3  
 data.cbSize=sizeof(NOTIFYICONDATA); `Rub"zM  
 data.hWnd=GetSafeHwnd(); )mz [2Sfg  
 data.uID=98; d kHcG&)  
 Shell_NotifyIcon(NIM_DELETE,&data); 0?qXDO&~  
 ShowWindow(SW_SHOW); gbL99MZ@~  
 SetForegroundWindow(); v`A^6)U#M  
 ShowWindow(SW_SHOWNORMAL); o7i/~JkTP  
 bTray=FALSE; QZ$94XLI  
} BC ]^BKP  
A,ttn5Sh?  
void CCaptureDlg::OnChange() ^0_*AwIcN  
{ 8xJdK'  
 RegisterHotkey(); MCD]n  
} =;-/( C  
`r e]Q0IO  
BOOL CCaptureDlg::RegisterHotkey() @vh3S+=M  
{ \$}xt`6p  
 UpdateData(); a,b ;H(em  
 UCHAR mask=0; Q^$IlzG7i  
 UCHAR key=0; y44FejH(v  
 if(m_bControl) RIJ+]uir4  
  mask|=4; $v#Q'?jE  
 if(m_bAlt) sesr`,m.,  
  mask|=2; :~3sW< P R  
 if(m_bShift) I& l1b>  
  mask|=1; 2+M(!FHfy  
  key=Key_Table[m_Key.GetCurSel()]; -l+ &Bkf  
 if(bRegistered){ R/R[r> 1)6  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \[Op:^S  
  bRegistered=FALSE; i;;CU9`E2q  
 } ol^V@3[<  
 cMask=mask; ;2q;RT`h  
 cKey=key; X+)68  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); jhjGDF  
 return bRegistered; I~\j%zD  
} bAms-cXm  
-%*>z'|{  
  四、小结 g6o-/A!Q3  
*M\Qt_[  
  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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