社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 5745阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: BWzo|isv  
  Z )X(  
  一、实现方法 >n5Kz]]%  
l'?(4 N  
  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: , 1il&  
@Dd3mWKq  
#pragma data_seg("shareddata") 1+Bj` ACP  
HHOOK hHook =NULL; //钩子句柄 WISeP\:^  
UINT nHookCount =0; //挂接的程序数目 *-s':('R  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 hlHle\[ds  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 o6 8;-b'n  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \ZC0bHsA  
static int KeyCount =0; (~^KXJ{->  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 7+m.:~H3}  
#pragma data_seg() FeJKXYbk<  
xfA@GYCfT  
  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。 Xnxb.{C  
G4"[ynlWV  
  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: uC"Gm;0  
8e_9u@p+w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ||#+ ^p7G  
cKey,UCHAR cMask) <'O|7. ^^  
{ 3#h@,>Z;  
 BOOL bAdded=FALSE; >x${I`2w  
 for(int index=0;index<MAX_KEY;index++){ d4LH`@SUZ-  
  if(hCallWnd[index]==0){ _p%@x:\  
   hCallWnd[index]=hWnd; -V:7j8  
   HotKey[index]=cKey; 2MDY nMy  
   HotKeyMask[index]=cMask; A~8-{F 31  
   bAdded=TRUE; !-8y;,P  
   KeyCount++; 8-)@q|  
   break; }QJ6"s  
  } sDXQ{*6a  
 } `W%R  
 return bAdded; B{NGrC`5)  
} m[A$Sp_"-h  
//删除热键 {Yv5Z.L&(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I_ na^s h*  
{ ^/7Y3n!|3  
 BOOL bRemoved=FALSE; a7e.Z9k!  
 for(int index=0;index<MAX_KEY;index++){ 0V'XE1h  
  if(hCallWnd[index]==hWnd){ 9<"l!noy  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]Waa7)}DM  
    hCallWnd[index]=NULL; <#e!kWGR?  
    HotKey[index]=0; U z MIm  
    HotKeyMask[index]=0; ( Uk\O`)m  
    bRemoved=TRUE; zmU>  
    KeyCount--; cnM`ywKW  
    break; 7@ mP;K0  
   } rv %^2h<&  
  } ]dnB ,  
 } K[9{]$(Z  
 return bRemoved; 86~q pN  
} G\ /L.T  
trL8oZ6  
Pol c.  
  DLL中的钩子函数如下: "XKd#ncP  
7G23D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TL([hR _  
{ 3@mW/l>X  
 BOOL bProcessed=FALSE; M;E$ ]Z9  
 if(HC_ACTION==nCode) iuEQ?fp  
 { g y1i%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 \_|r>vQ  
   switch(wParam) Z|zT%8.8N  
   {  J\\o# -H  
    case VK_MENU: 'dcO-A:>  
     MaskBits&=~ALTBIT; {(^%2dk83C  
     break; |3 v+&eVi  
    case VK_CONTROL: oY7 eVuz  
     MaskBits&=~CTRLBIT; +'9eo%3O  
     break; ~ tqDh(  
    case VK_SHIFT: 'h;x>r  
     MaskBits&=~SHIFTBIT; d7v_>  
     break; \Gy+y`   
    default: //judge the key and send message vkW]?::Cfd  
     break; VY "i>Ae  
   } 79>_aD9  
   for(int index=0;index<MAX_KEY;index++){ i}Cy q  
    if(hCallWnd[index]==NULL) gv9z`[erS  
     continue; ]s~%1bd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %s[ n2w  
    { Xldz& &@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); yUu+68Z6  
     bProcessed=TRUE; 4 UnN~  
    }  ehQ~+x  
   } mjbV^^>  
  } Y>PC>  
  else if((lParam&0xc000ffff)==1){ //有键按下 ~9dAoILrl  
   switch(wParam) a9TKp$LP`  
   { go5l<:9  
    case VK_MENU: BY??X=  
     MaskBits|=ALTBIT; n; *W#c  
     break; |1Pi`^  
    case VK_CONTROL: s F3M= uz  
     MaskBits|=CTRLBIT; ]nQ(|$rW  
     break; ^I6GH?19>e  
    case VK_SHIFT: 3H@29TrJ+  
     MaskBits|=SHIFTBIT; e"voXe  
     break; ph=U<D4  
    default: //judge the key and send message bd3q207>  
     break; %1e{"_$O9  
   } :faB7wduW;  
   for(int index=0;index<MAX_KEY;index++){ -LEpT$v|  
    if(hCallWnd[index]==NULL) 7|q _JdKoU  
     continue; O@? *5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) - x]gp5  
    { Ixv/xI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -gb'DN1BG  
     bProcessed=TRUE; S$Fq1  
    } ^ot9Q  
   } Zcxj.F(,  
  } KZ/ 2#`  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 g(F? qP_K  
   for(int index=0;index<MAX_KEY;index++){ >O}J*4A>+#  
    if(hCallWnd[index]==NULL) |iB svI:  
     continue; XLsOn(U\&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "3:TrM$|A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $7bux 1L  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 f)!7/+9>  
   } %R LGO&  
  } f2RIOL,  
 } uM('R;<^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {AMoE +U  
} + +G %~)S:  
6T{SRN{  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: xzTF| Z\  
qn|~z@"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nV&v@g4Tt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rty&\u@}  
Z;nUS,?om  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: +~1~f'4J  
hXz@ (cF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #[ch?K  
{ { aq}Q|?/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) gVI2{\a  
 { d]w%zo,yr  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :pPn)j$  
  SaveBmp(); bcC+af0L  
  return FALSE; Ve^rzGU  
 } r&c31k]E  
 …… //其它处理及默认处理 Z7Xic5PI{4  
} ~Y'j8W  
YR}By;Bq  
L% ?3VW  
  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。 9V( esveq  
?br4 wl  
  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。 YUsMq3^&  
m kHcGB!~  
  二、编程步骤 %t<ba[9F  
UV8K$n<  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; W05>\Rl  
N"rZK/@}  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; dt|f4 XWF  
Q XV8][  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; qb1[-H  
u#`FkuE\}  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ;f)o_:(JJ  
Wg ?P"  
  5、 添加代码,编译运行程序。 iHL`r1I!  
2OQDG7#Kc  
三、程序代码 B!zqvShF  
W;@9x1jK X  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ,=Fn6'  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ?sm@lDZ\  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ S2*ER  
#if _MSC_VER > 1000 p7kH"j{xD  
#pragma once yCOIv!/zy  
#endif // _MSC_VER > 1000 +qzCy/_gd  
#ifndef __AFXWIN_H__ Yl$Cj>FG  
#error include 'stdafx.h' before including this file for PCH XT0:$0F  
#endif t?:Q  
#include "resource.h" // main symbols 8  }(ul  
class CHookApp : public CWinApp s/J/kKj*s  
{ ;5wr5H3  
 public: h1 (MvEt  
  CHookApp(); y:3d`E4Xw  
  // Overrides [Y=X^"PF  
  // ClassWizard generated virtual function overrides '4}c1F1T_  
  //{{AFX_VIRTUAL(CHookApp) <UMT:`h1MZ  
 public: Yab=p 9V;;  
  virtual BOOL InitInstance(); ~ GW8|tw  
  virtual int ExitInstance(); eq#x~O4  
  //}}AFX_VIRTUAL -L%2*`-L$  
  //{{AFX_MSG(CHookApp) ~M4@hG!  
  // NOTE - the ClassWizard will add and remove member functions here. {#'M3z=  
  // DO NOT EDIT what you see in these blocks of generated code ! V9Gk``F<RZ  
  //}}AFX_MSG a4L0Itrp  
  DECLARE_MESSAGE_MAP() ie%_-  
};  p3YF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); =ap6IVR  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J%n{R60b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SS/t8Y4W  
BOOL InitHotkey(); x3++JG  
BOOL UnInit(); J \V.J/  
#endif 3Ta<7tEM  
Cq-#| +zr  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. .6D9m.Q,  
#include "stdafx.h" xFY< ns  
#include "hook.h" ~1yMw.04V  
#include <windowsx.h> tuiQk=[ c  
#ifdef _DEBUG !(wH}ti  
#define new DEBUG_NEW 11Hf)]M   
#undef THIS_FILE 2og8VI  
static char THIS_FILE[] = __FILE__; GXE6=BO  
#endif \"u3 x.!  
#define MAX_KEY 100 f!"Y"g:@E  
#define CTRLBIT 0x04 Ft)Z'&L   
#define ALTBIT 0x02 _%$(D"^j  
#define SHIFTBIT 0x01 ef;Ta|#  
#pragma data_seg("shareddata") ttK`*Ng  
HHOOK hHook =NULL; _7M!b 9oA  
UINT nHookCount =0; ToB^/ n[  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey VI (;8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 2i@t;h2E  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey  !&Z,ev  
static int KeyCount =0; khW9n*  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift X0.-q%5  
#pragma data_seg() P6E=*^^m(  
HINSTANCE hins; [8K+  zT5  
void VerifyWindow(); F}lgy;=h  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) l< y9ue=  
//{{AFX_MSG_MAP(CHookApp) *I(g~p  
// NOTE - the ClassWizard will add and remove mapping macros here. Ph&fOj=pFb  
// DO NOT EDIT what you see in these blocks of generated code! Sp]i~#q_'  
//}}AFX_MSG_MAP C;jV{sb9c  
END_MESSAGE_MAP() Q#i^<WUpg  
;\ $P;-VY  
CHookApp::CHookApp() ,OQ!lI_`R  
{ XT|!XC!|  
 // TODO: add construction code here, ~BVK6  
 // Place all significant initialization in InitInstance h!*++Y?&0  
} !j3V'XU#Zn  
yT>t[t60/S  
CHookApp theApp; L#`9# Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) v0dFP0.;&  
{ Y)@PGxjz  
 BOOL bProcessed=FALSE; ]/+qM)F  
 if(HC_ACTION==nCode) VhAZncw  
 { P~+?:buqc  
  if((lParam&0xc0000000)==0xc0000000){// Key up {xC CUU  
   switch(wParam) 'ZHu=UT7_  
   { WR*|kh  
    case VK_MENU: YW}1iT/H  
     MaskBits&=~ALTBIT; Iy}r'#N  
     break; Qn7l-:`?  
    case VK_CONTROL: 1x07ua@(v  
     MaskBits&=~CTRLBIT; &E{5k{Y  
     break; ')9%eBaeK  
    case VK_SHIFT: @x@w<e%  
     MaskBits&=~SHIFTBIT; ItTIU  
     break; J L9d&7-  
    default: //judge the key and send message J9LS6~ 7  
     break; I@=h|GM  
   } m\lSBy6  
   for(int index=0;index<MAX_KEY;index++){ ,qRSB>5c  
    if(hCallWnd[index]==NULL) ?[W(r$IaE  
     continue; RTSR-<{z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {}3kla{  
    { bmAgB}Ior  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); sK:,c5^  
     bProcessed=TRUE; t#y   
    } xX'Uq_ Jv  
   } P#H#@:/3  
  } gKZ{O  
  else if((lParam&0xc000ffff)==1){ //Key down +fhyw{  
   switch(wParam) |7Q8WjCQ{m  
   { RZfC ?  
    case VK_MENU: _^RN C)ol  
     MaskBits|=ALTBIT; >5Zp x8W  
     break; ^gFjm~2I  
    case VK_CONTROL: 6,xoxNoPP3  
     MaskBits|=CTRLBIT; g)'tr '  
     break; `~(C\+gUp  
    case VK_SHIFT: S iw9_c  
     MaskBits|=SHIFTBIT; s9A'{F  
     break; er5}=cFZ  
    default: //judge the key and send message !dLz ?0  
     break; mm=Y(G[_%y  
   } J1<fE(X  
   for(int index=0;index<MAX_KEY;index++) JXeqVKF  
   { 1V`]sfRK  
    if(hCallWnd[index]==NULL) -aNTFt~|[  
     continue; skcMGEB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x 0  
    {  &1Fcwj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); EGwY|+3  
     bProcessed=TRUE; 7atYWz~yG  
    } H/V%D O  
   } uz4mHyS6  
  } u,F d[[t  
  if(!bProcessed){ nRQIrUNq  
   for(int index=0;index<MAX_KEY;index++){ .bl0w"c^qq  
    if(hCallWnd[index]==NULL) }bznx[4?I  
     continue; L>UYR++<6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ) WIlj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); FbM5Bqv  
   } V8&/O)}o  
  } L1QQU  
 } bT-G<h*M  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (?\ZN+V)  
} gE=~.P[ZX  
cM4?G gn  
BOOL InitHotkey() \|>eG u  
{ "tIf$z  
 if(hHook!=NULL){ savz>E &  
  nHookCount++; 7IJb$af:;  
  return TRUE; 3r em"M  
 } ~v>w%]  
 else e( ^9fg_SG  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %,,h )9  
  if(hHook!=NULL) t=\V&,  
   nHookCount++; wH Z!t,g  
  return (hHook!=NULL); * Kzs(O  
} @@|E1'c7  
BOOL UnInit() s*CKFEb#  
{ )+t5G>yKK  
 if(nHookCount>1){ vB4cdW 2#3  
  nHookCount--; ap%o\&T;  
  return TRUE; ,f?#i%EF&  
 } 0acY@_  
 BOOL unhooked = UnhookWindowsHookEx(hHook); N2&aU?`e  
 if(unhooked==TRUE){ @?]-5~3;  
  nHookCount=0; \S7OC   
  hHook=NULL; %y w*!A1  
 } )N=b<%WD   
 return unhooked; /1li^</|p`  
} Aq'%a)Y2  
=cC]8Pz?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Bh' vr3|  
{ eBAB7r/7  
 BOOL bAdded=FALSE; KR^peWR  
 for(int index=0;index<MAX_KEY;index++){ 1yB;"q&Xd  
  if(hCallWnd[index]==0){ .;KupQ;*  
   hCallWnd[index]=hWnd; M<$l&%<`G  
   HotKey[index]=cKey; ` `;$Kr  
   HotKeyMask[index]=cMask; ') 1sw%[2  
   bAdded=TRUE; Mqh~5NM  
   KeyCount++; F[=m|MZb  
   break; |C&eH$?~=R  
  } Xi{(1o4%  
 } [S4\fy0  
 return bAdded; *VlYl"  
} hYd8}BvA  
|16 :Zoq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) VvF&E>f C  
{ X3m?zQbhv  
 BOOL bRemoved=FALSE; *Ra")(RnDK  
 for(int index=0;index<MAX_KEY;index++){ n&C9f9S  
  if(hCallWnd[index]==hWnd){ Y!7P>?)`,X  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k(qQvn  
    hCallWnd[index]=NULL; Wq9s[)F"Z  
    HotKey[index]=0; ?^ErrlI_  
    HotKeyMask[index]=0; Ro1' L1:  
    bRemoved=TRUE;  ^,KR0  
    KeyCount--; Fo G<$9  
    break; 5nj~RUK  
   } b<( W}$x  
  } &vF"I'V  
 } )(L&+DDy  
 return bRemoved; <@vE 3v;  
} ;ZqFrHI M`  
-.*\J|S@g  
void VerifyWindow() M<p)@p  
{ :9h8q"T  
 for(int i=0;i<MAX_KEY;i++){ Gj ^bz'2  
  if(hCallWnd!=NULL){ |wb7`6g  
   if(!IsWindow(hCallWnd)){ Np-D:G  
    hCallWnd=NULL; ^r& {V"l]  
    HotKey=0; ?0(B;[xEJ  
    HotKeyMask=0; O^xt  
    KeyCount--; nDOIE)#  
   } oPbD9  
  } rOD KM-7+  
 } V]O :;(W_  
} Ur-^X(nL  
ZkIQ-;wx  
BOOL CHookApp::InitInstance() u=l(W(9=  
{ .)3 2WD%  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); {;}8Z$  
 hins=AfxGetInstanceHandle(); sR 9F:  
 InitHotkey(); Ii,:+o%  
 return CWinApp::InitInstance(); \O:xw-eG   
} \S<5b&G  
O+8`.  
int CHookApp::ExitInstance() UJH{vjIv  
{ !qpu /  
 VerifyWindow(); P8VU&b\  
 UnInit(); `l+SJLyJ%  
 return CWinApp::ExitInstance(); LX fiSM{o  
} bvx:R ~E$  
%pp+V1FH  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~?&ijhZ  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G'py)C5;  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ f lB,_  
#if _MSC_VER > 1000 \+u qP:Ty  
#pragma once biG9?  
#endif // _MSC_VER > 1000 [dJ\|=  
4r. W:}4:  
class CCaptureDlg : public CDialog ".)_kt[  
{ #~x5}8  
 // Construction eI}VHBAz  
 public: HIq1/)  
  BOOL bTray; RrHnDO'  
  BOOL bRegistered; EDo@J2A  
  BOOL RegisterHotkey(); @(cS8%wK  
  UCHAR cKey; X u_<4  
  UCHAR cMask; S2R[vB4).  
  void DeleteIcon(); <n\.S  
  void AddIcon(); `g1Oon_  
  UINT nCount; ]1&9~TL  
  void SaveBmp(); QB[s8"S  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor I5L7BTe  
  // Dialog Data #I?iR 3u  
  //{{AFX_DATA(CCaptureDlg) n{t',r50  
  enum { IDD = IDD_CAPTURE_DIALOG }; >>$|,Q-.  
  CComboBox m_Key; [tzSr=,Cg  
  BOOL m_bControl;  {K9E% ,w  
  BOOL m_bAlt; c Vn+~m_%  
  BOOL m_bShift; V)2_T!e%*  
  CString m_Path; =b7&(x  
  CString m_Number;  z\tJ~  
  //}}AFX_DATA M: "ci;*$  
  // ClassWizard generated virtual function overrides rl%Kn^JJ~  
  //{{AFX_VIRTUAL(CCaptureDlg) 9>R|k$`  
 public: 6EU4  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !7)ID7d  
 protected: #'x?) AS  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {_Qxe1^g  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); / D ]B  
  //}}AFX_VIRTUAL 3@] a#>  
  // Implementation \=7=>x_  
 protected: 1[l>D1F?  
  HICON m_hIcon; IBkH+j  
  // Generated message map functions $/TA5h  
  //{{AFX_MSG(CCaptureDlg) ? ~Zrd  
  virtual BOOL OnInitDialog(); M@g gLW  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); i8Y gG0[)  
  afx_msg void OnPaint(); wWw/1i:|'  
  afx_msg HCURSOR OnQueryDragIcon(); k_n{Mss'9  
  virtual void OnCancel(); n ;5?^Un%  
  afx_msg void OnAbout(); txo?k/w  
  afx_msg void OnBrowse(); vB5iG|b}  
  afx_msg void OnChange(); +&,\ J9'B  
 //}}AFX_MSG PAwg&._K  
 DECLARE_MESSAGE_MAP() 6\Vu#r  
}; MNqyEc""  
#endif g u =fq\`  
\hW73a!  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file eH955[fVd4  
#include "stdafx.h" Sqf.#}u<=  
#include "Capture.h" KN:dm!A  
#include "CaptureDlg.h" :EwA$`/  
#include <windowsx.h> %_MR.J+m2  
#pragma comment(lib,"hook.lib") oRThJB  
#ifdef _DEBUG }AW)R&m  
#define new DEBUG_NEW }pnFJ  
#undef THIS_FILE xqWrW)  
static char THIS_FILE[] = __FILE__; |/^aL j^u  
#endif 1vs>2` DLa  
#define IDM_SHELL WM_USER+1 W lQ=CRY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6Y )^)dOi  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !* Z)[[  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; e K1m(E.=  
class CAboutDlg : public CDialog ev%t5NZ  
{ MD4 j~q\ g  
 public: 1IQOl  
  CAboutDlg(); rg^\BUa-W,  
  // Dialog Data z %3"d0  
  //{{AFX_DATA(CAboutDlg) = )l:^+q  
  enum { IDD = IDD_ABOUTBOX }; q>(u>z!  
  //}}AFX_DATA oHXW])[  
  // ClassWizard generated virtual function overrides UUf1T@-  
  //{{AFX_VIRTUAL(CAboutDlg) aE+$&_>ef  
 protected: D 2:a  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *7;*@H*jd  
  //}}AFX_VIRTUAL Cn;H@!8<s  
  // Implementation SE9u2Jk  
 protected: mUyv+n,  
  //{{AFX_MSG(CAboutDlg) $v<hW A]>  
  //}}AFX_MSG }t D!xI;  
  DECLARE_MESSAGE_MAP() 8N* -2/P&  
}; liw 9:@+V  
+'j*WVE%5  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) OO\biYh o  
{ p:<gFZb  
 //{{AFX_DATA_INIT(CAboutDlg) b/,!J] W  
 //}}AFX_DATA_INIT R^M (fC  
} K: o|kd  
;=VK _3"  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ICCCCG*[  
{ QGv:h[b_  
 CDialog::DoDataExchange(pDX); B%rr}Ro1e  
 //{{AFX_DATA_MAP(CAboutDlg) ]7S7CVDk4  
 //}}AFX_DATA_MAP CDwIq>0j  
} aQ&8fteFR  
0?Tk* X  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) o%^k T&  
 //{{AFX_MSG_MAP(CAboutDlg) }Q r0T  
 // No message handlers 2}`Vc{\  
 //}}AFX_MSG_MAP )-?uX.E{  
END_MESSAGE_MAP() fo\J \  
?Y6la.bc{  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) >c y.]uB  
: CDialog(CCaptureDlg::IDD, pParent) F `pyhc>1;  
{ kYA'PW/[ )  
 //{{AFX_DATA_INIT(CCaptureDlg) 95?5=T F  
  m_bControl = FALSE; [+MH[1Vr={  
  m_bAlt = FALSE; U~#^ ^  
  m_bShift = FALSE; N7$DRG/<b  
  m_Path = _T("c:\\"); Z_V&IQo-7  
  m_Number = _T("0 picture captured."); o(X90X  
  nCount=0; @@{_[ir  
  bRegistered=FALSE; vgQhdtt  
  bTray=FALSE; !OoaE* s  
 //}}AFX_DATA_INIT me[J\MJ;w^  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ?V5Pt s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); oY2?W  
} kLPO+lg+  
8~s-t  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) =O3I[  
{ MY?O/,6  
 CDialog::DoDataExchange(pDX); \p@nH%@v  
 //{{AFX_DATA_MAP(CCaptureDlg) }Cmj(k`~  
  DDX_Control(pDX, IDC_KEY, m_Key); |+;KhC  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 0(U3~ k6  
  DDX_Check(pDX, IDC_ALT, m_bAlt); V>>) 7E:Q  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ]IHD:!Z-=  
  DDX_Text(pDX, IDC_PATH, m_Path); +NLQYuN  
  DDX_Text(pDX, IDC_NUMBER, m_Number); fJn3"D'  
 //}}AFX_DATA_MAP 7\0|`{|R@  
} PD}SPOA`U3  
cGpN4|*rQ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) q0b`HD  
//{{AFX_MSG_MAP(CCaptureDlg) !|Xl 8lV`  
 ON_WM_SYSCOMMAND() :L [YmZ  
 ON_WM_PAINT() B=q)}aWc  
 ON_WM_QUERYDRAGICON() Jp.3KA>  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) >xU72l#5  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) lN)Y  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .sJys SA\  
//}}AFX_MSG_MAP 0.u9f`04  
END_MESSAGE_MAP() TM/|K|_  
iB}LnC:  
BOOL CCaptureDlg::OnInitDialog() S4k^&$;  
{ 36^C0uNdX  
 CDialog::OnInitDialog(); 9&XV}I,~?|  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); h$aew63  
 ASSERT(IDM_ABOUTBOX < 0xF000); VM<oUKh_3  
 CMenu* pSysMenu = GetSystemMenu(FALSE); V 4\^TO`q=  
 if (pSysMenu != NULL) 1%/ NL?8#  
 { hk"9D<&i>b  
  CString strAboutMenu; a_ 9|xI  
  strAboutMenu.LoadString(IDS_ABOUTBOX); *,pZ fc  
  if (!strAboutMenu.IsEmpty()) `b^#quz  
  { oA!5dpNhU  
   pSysMenu->AppendMenu(MF_SEPARATOR); - 5o<Q'(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); k}I5x1>&  
  } C>JekPeM  
 } x  tYV"  
 SetIcon(m_hIcon, TRUE); // Set big icon $K6?(x_  
 SetIcon(m_hIcon, FALSE); // Set small icon #!8^!}nFO  
 m_Key.SetCurSel(0); "5o;z@(  
 RegisterHotkey(); RFZU}.*K$  
 CMenu* pMenu=GetSystemMenu(FALSE); Pghva*&  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); AT%* ~tr  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); As6)_8w  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Yhc6P%{Z^  
 return TRUE; // return TRUE unless you set the focus to a control M!&_qj&N,  
} HIPcZ!p  
IFC%%I t5,  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0.J1!RIK/  
{ {FV,j.D  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) To#E@Nw  
 { LY\ddI*s  
  CAboutDlg dlgAbout; zt)p`kdD  
  dlgAbout.DoModal(); #uD)0zdw  
 } (<]\,pP0_  
 else u|m[(-`  
 { gJFR1  
  CDialog::OnSysCommand(nID, lParam); B&4fYpn  
 } >+Sv9S  
} e'k;A{Oh  
ueWR/  
void CCaptureDlg::OnPaint() %jbJ6c  
{ *2qh3  
 if (IsIconic()) _S9rF-9G]  
 { 629~Uc6]  
  CPaintDC dc(this); // device context for painting 9atjK4+o  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);  Z;j/K  
  // Center icon in client rectangle jy\W_CT  
  int cxIcon = GetSystemMetrics(SM_CXICON); p|FlWR'mA  
  int cyIcon = GetSystemMetrics(SM_CYICON); Eu`2w%qz  
  CRect rect; 2y9:'c|  
  GetClientRect(&rect); T@K7DkP@  
  int x = (rect.Width() - cxIcon + 1) / 2; w|!YoMk+o  
  int y = (rect.Height() - cyIcon + 1) / 2; ^f^-.X  
  // Draw the icon KAj"p9hq+k  
  dc.DrawIcon(x, y, m_hIcon); _Hz~HoNU  
 } ? -v  
 else 3iu!6lC  
 { L\/u}]dPQ  
  CDialog::OnPaint(); SWNU1x{,c\  
 } 3o+KP[A  
} L?=#*4t  
{f`lSu  
HCURSOR CCaptureDlg::OnQueryDragIcon() d'N(w7-Y  
{ hw&ke$Fg#  
 return (HCURSOR) m_hIcon; eW\?eq+ `A  
} Ph(]?MG\_  
PtQQZ"ept  
void CCaptureDlg::OnCancel() k%EWkM)?  
{ 2gQY8h8  
 if(bTray) Pcs^@QP  
  DeleteIcon(); 8 *4@-3Sx  
  CDialog::OnCancel(); pchQ#GU  
} i_ |9<7a  
;yk9(wea}"  
void CCaptureDlg::OnAbout() l 8O"w&  
{ :3111}>c  
 CAboutDlg dlg; ~pHJ0g:t  
 dlg.DoModal(); .+{nA}Bc  
} 8fJR{jD(s  
/~H[= Pf  
void CCaptureDlg::OnBrowse() /[\6oa  
{ <u6c2!I{  
 CString str; g8%MOhg  
 BROWSEINFO bi; e+NWmu{<_  
 char name[MAX_PATH]; ?60>'Xj j  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,bB( 24LD  
 bi.hwndOwner=GetSafeHwnd(); Si#"Wn?|  
 bi.pszDisplayName=name; tP}Xhn`  
 bi.lpszTitle="Select folder"; %iK%$  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Pk$}%;@v  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); W0VA'W  
 if(idl==NULL) kVV\*"9y  
  return; fC=fJZU7$  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <T(s\N5B=  
 str.ReleaseBuffer(); =}~NRmmF  
 m_Path=str; 3x04JE3!  
 if(str.GetAt(str.GetLength()-1)!='\\') [:AB$l*  
  m_Path+="\\"; 5Z* b(R  
 UpdateData(FALSE); jK3giT  
} T$:>*  
?cqicN.+6  
void CCaptureDlg::SaveBmp() gJ]Cq/gC  
{ PYdIP\<V  
 CDC dc; 5."5IjZu  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); {F;,7Kn+l  
 CBitmap bm; X}3P1.n:  
 int Width=GetSystemMetrics(SM_CXSCREEN); ]WTf< W<  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]O6KKz  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ^ H'hD  
 CDC tdc; J9g|#1G  
 tdc.CreateCompatibleDC(&dc); /yLzDCKn  
 CBitmap*pOld=tdc.SelectObject(&bm); aXRv}WO$>k  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); +n@f'a">  
 tdc.SelectObject(pOld); /)sDnJ1r  
 BITMAP btm; * eA{[  
 bm.GetBitmap(&btm); Gh2#-~|cB  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; %GM>u2baw  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); BmJkt3j."  
 BITMAPINFOHEADER bih; }16&1@8  
 bih.biBitCount=btm.bmBitsPixel;  pgC d  
 bih.biClrImportant=0; ?g5iok {  
 bih.biClrUsed=0; 4BHtR017r  
 bih.biCompression=0; a`DWpc~  
 bih.biHeight=btm.bmHeight; \M+MDT&  
 bih.biPlanes=1; gdOe)il\  
 bih.biSize=sizeof(BITMAPINFOHEADER); 0LS -i%0  
 bih.biSizeImage=size; N2ni3M5v  
 bih.biWidth=btm.bmWidth; MKomq  
 bih.biXPelsPerMeter=0; BqQ] x'AF  
 bih.biYPelsPerMeter=0; ||R0U@F,  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /rqqC(1  
 static int filecount=0; qpoquWZ  
 CString name; 6hp{,8|D"m  
 name.Format("pict%04d.bmp",filecount++); I|H,)!Z  
 name=m_Path+name; 7 n\mj\  
 BITMAPFILEHEADER bfh; ):/,w!1  
 bfh.bfReserved1=bfh.bfReserved2=0;  ~q*i;*  
 bfh.bfType=((WORD)('M'<< 8)|'B'); PoJmW^:}  
 bfh.bfSize=54+size; `tX@8|  
 bfh.bfOffBits=54; 3voW  
 CFile bf; q5%2WM]6  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Q6u{@$(/N  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Cy`26[E$S  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); F|,6N/;!W  
  bf.WriteHuge(lpData,size); v}Z9+ yRC2  
  bf.Close(); [w,(EE   
  nCount++; }6<)yW}U  
 } h5x*NM1Ih  
 GlobalFreePtr(lpData); {W-5:~?"  
 if(nCount==1) Dh2#$[/@1  
  m_Number.Format("%d picture captured.",nCount); !IN @i:m  
 else DUqJ y*F(  
  m_Number.Format("%d pictures captured.",nCount); w nWgy4:  
  UpdateData(FALSE); B#1:Y;Z  
} "<qEXX  
b9`iZ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) o\&~CW~@~  
{ `(3SfQ-  
 if(pMsg -> message == WM_KEYDOWN) q1STRYb   
 { aQga3;S!  
  if(pMsg -> wParam == VK_ESCAPE) %?Rs*-F.~1  
   return TRUE; e]>/H8  
  if(pMsg -> wParam == VK_RETURN) *vb^N0P  
   return TRUE; n|6?J_{<b>  
 } 'm[6v}  
 return CDialog::PreTranslateMessage(pMsg); 2%5?F n=  
} %Mh Q  
<3lUV7!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .x EJaID\N  
{ `-o5&>'nf  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ {>/)5 AGs  
  SaveBmp(); F,Q?s9s  
  return FALSE; R'L?Xn}3  
} {H+?z<BF<  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ J,RDTXqn  
 CMenu pop; !I~C0u  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #VO.%H}i  
 CMenu*pMenu=pop.GetSubMenu(0); Ey'J]KVW  
 pMenu->SetDefaultItem(ID_EXITICON); Vd21,~^>g  
 CPoint pt; sllzno2bU  
 GetCursorPos(&pt); `%oIRuYG]j  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =rEA:Q`~w  
 if(id==ID_EXITICON) @^'$r&M  
  DeleteIcon(); wDMjk2 YN  
 else if(id==ID_EXIT) 2yvVeo&3  
  OnCancel(); #\LZ;&T'N  
 return FALSE; "NKf0F  
} U~wjR"='  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); JIMWMk;ot  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) o*-9J2V=J  
 AddIcon(); C-Ig_Nc  
 return res;   La9r  
} a&C.=  
4#_$@ r  
void CCaptureDlg::AddIcon() R5~gH6K|  
{ 7D   
 NOTIFYICONDATA data;  #I;D  
 data.cbSize=sizeof(NOTIFYICONDATA); 3?@?-q2g  
 CString tip; 7lR<@$q  
 tip.LoadString(IDS_ICONTIP); Ew]<jF|.#  
 data.hIcon=GetIcon(0); c yP,[?N  
 data.hWnd=GetSafeHwnd(); +TF8WZZF.d  
 strcpy(data.szTip,tip); PS$k >_=t  
 data.uCallbackMessage=IDM_SHELL; z{|LQt6q  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >ukQ, CE~  
 data.uID=98; (')(d HHW  
 Shell_NotifyIcon(NIM_ADD,&data); (8G$(MK  
 ShowWindow(SW_HIDE); XMw.wQ '?  
 bTray=TRUE; ei|cD[ NY  
} \DS^i`o)rY  
3b@VY'P  
void CCaptureDlg::DeleteIcon() };r|}v !~_  
{ 1A^1@^{m'  
 NOTIFYICONDATA data; (N0sE"_~I5  
 data.cbSize=sizeof(NOTIFYICONDATA); O:e#!C8^  
 data.hWnd=GetSafeHwnd(); [x5mPjgw  
 data.uID=98; w4,]2Ccn.  
 Shell_NotifyIcon(NIM_DELETE,&data); [Tp%"f1  
 ShowWindow(SW_SHOW); m6i%DE  
 SetForegroundWindow(); w.uK?A>W,  
 ShowWindow(SW_SHOWNORMAL); hg8Be6G <  
 bTray=FALSE; DvYwCgLR  
} %'0&ElQ  
4-V)_U#8  
void CCaptureDlg::OnChange() O,|\"b1(  
{ 3cixQzb}u  
 RegisterHotkey(); (sCAR=5v\  
} 3;l"=#5  
Yb 6q))Y  
BOOL CCaptureDlg::RegisterHotkey() /zT`Y=1  
{ 6G}c1nWU  
 UpdateData(); B.*"Xfr8  
 UCHAR mask=0; 1"YpO"Rh  
 UCHAR key=0; JDA]t&D!v  
 if(m_bControl) Y\( ;!o0a  
  mask|=4; ezn` _x_?  
 if(m_bAlt) h/K@IA d  
  mask|=2; .$0Pr%0pWI  
 if(m_bShift) C ) ?uE'  
  mask|=1; Kt6>L5:94  
  key=Key_Table[m_Key.GetCurSel()]; c`jDW S  
 if(bRegistered){ % O%xpSYr  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); PS@*qTin  
  bRegistered=FALSE; Ri @`a  
 } J633uH}}  
 cMask=mask; 7W|Zq6p i  
 cKey=key; :gf;}  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); k.GA8=]>  
 return bRegistered; oH X$k{6  
} uR_F,Mp?%u  
uPLErO9Es[  
  四、小结 m$:&P|!'p  
X#ZgS!Mn  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八