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
  • 5253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: cn1UFmT  
  Gq_rZo(@  
  一、实现方法 LWQ.!;HYp  
*GxOiv7"4W  
  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: o";5@NH  
UruD&=AMK  
#pragma data_seg("shareddata") es}j6A1  
HHOOK hHook =NULL; //钩子句柄 PMER~}^  
UINT nHookCount =0; //挂接的程序数目 Y0`@$d&n  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 nA:\G":\y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 GRV#f06  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0?hJ!IT;q7  
static int KeyCount =0; Ml`tDt|;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 R[Y]B$XO  
#pragma data_seg() :<$B o  
y{CyjYpz^  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 _&!%yW@  
<i9pJGW  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ~Pq(Ta  
 d~B ]s  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR u~MD?!LV  
cKey,UCHAR cMask) f>$Ld1  
{ F/c7^  
 BOOL bAdded=FALSE; l AF/O5b  
 for(int index=0;index<MAX_KEY;index++){ !Z +4FwF  
  if(hCallWnd[index]==0){ {k.Dy92  
   hCallWnd[index]=hWnd; L'XX++2  
   HotKey[index]=cKey; nO{@p_3mi  
   HotKeyMask[index]=cMask; Rv R ,V  
   bAdded=TRUE; ?M'_L']N[  
   KeyCount++; x2gnB@t  
   break; t Dx!m~[  
  } 6")co9  
 } q:A{@kFq_  
 return bAdded; a%f?OsY  
} 72oiO[>N'  
//删除热键 OnGtIY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Hd)z[6u8eT  
{ c5~d^  
 BOOL bRemoved=FALSE; NPjh2 AJm  
 for(int index=0;index<MAX_KEY;index++){ #$trC)?~q  
  if(hCallWnd[index]==hWnd){ o(iv=(o  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ XEd|<+P1  
    hCallWnd[index]=NULL; %si5cc?  
    HotKey[index]=0; +[l52p@a  
    HotKeyMask[index]=0; TE+d?  
    bRemoved=TRUE; UO%Vu C5B  
    KeyCount--; dxm_AUM  
    break; 4 qdLH^dX  
   } {4u8~whLp  
  } d0(GE4+/  
 } BPAz.K Q  
 return bRemoved;  q0Rd^c  
} OE,uw2uaT  
!_{2\ &  
sDV*k4  
  DLL中的钩子函数如下: utk'joo  
Vg1! u+`<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _ PC}`Y'&  
{ =Rnx!E  
 BOOL bProcessed=FALSE; Al?LO;$Pa?  
 if(HC_ACTION==nCode) s^nPSY!  
 { ni @Mqb  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 =\v./Q-  
   switch(wParam) [H#*#v  
   {  T*"15ppfk  
    case VK_MENU: ZSL:q%:.  
     MaskBits&=~ALTBIT; oS'M  
     break; bJ8~/d]+  
    case VK_CONTROL: rx^vh%/ Q!  
     MaskBits&=~CTRLBIT; v@OyB7}  
     break; lNV%R(  
    case VK_SHIFT: MZ_+doN  
     MaskBits&=~SHIFTBIT; j!c[$;  
     break; {4\hxyw  
    default: //judge the key and send message Z  Mp  
     break; ![H!Y W'  
   } {,r7dxI)`  
   for(int index=0;index<MAX_KEY;index++){ JM8 s]&  
    if(hCallWnd[index]==NULL) dt NHj/\  
     continue; Iq&S6l <0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lLuAZoH  
    { LM_/:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); p_hljgOV  
     bProcessed=TRUE; |.D_[QI  
    } %y zFWDg  
   } C#]%  
  } ;0}8vs  
  else if((lParam&0xc000ffff)==1){ //有键按下  *,9.Bx*  
   switch(wParam) 2i);2>HLG  
   { phIEz3Fu/  
    case VK_MENU: m.~&n!1W*`  
     MaskBits|=ALTBIT; $mA+ 4ISK  
     break; <,~ =o  
    case VK_CONTROL: iR-MuDM  
     MaskBits|=CTRLBIT; 13s0uyYU<m  
     break;  YM9oVF-  
    case VK_SHIFT: A[juzOn\  
     MaskBits|=SHIFTBIT; h3^ &,U  
     break; Gmcx#?|Tx  
    default: //judge the key and send message Is6<3eQ\x  
     break; + ~ro*{3  
   } Yuy7TeJRx  
   for(int index=0;index<MAX_KEY;index++){ [0GM!3YJ7  
    if(hCallWnd[index]==NULL) l'~]8Wo1  
     continue; #80*3vi~F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zT}Qrf~  
    { :=#*[H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >/Z#{;kOz  
     bProcessed=TRUE; Meh?FW||5  
    } A%u@xL,_  
   } v |/IN  
  } 0D1yG(ck  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 x{io*sY-  
   for(int index=0;index<MAX_KEY;index++){ x>Ah4a d  
    if(hCallWnd[index]==NULL) \K 01 F  
     continue; g j`"|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) K[LTw_oE  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Fi{~UOZg  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 0|X!Uw-Q%_  
   } 2tvMa%1^  
  } ?MhRdY  
 } uh`@qmu)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;_0)f  
} d#T8|#O"  
P[{w23`4  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: JH!qGV1  
_C?<re3*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |7Z,z0 ?V  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >vg!<%]W]  
9/w'4bd  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: YgaJ*%\  
Co8b0-Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5| 2B@6-  
{ zY8"\ZB  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) r @~T}<I  
 { -"5x? \.{m  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 o}5:vi]  
  SaveBmp(); Yfy6o6*:  
  return FALSE; 8xmw-s)  
 } XKp%7;  
 …… //其它处理及默认处理 yz-IZt(  
} sZ-]yr\E"  
=S@$"_&  
ovCk :Vz  
  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。 ,TU!W|($  
uMF\3T(x4  
  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。  1$idF  
B@*BcE?  
  二、编程步骤 %dZD;Vhg  
xtjTU;T  
  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"; 9Q :IgY?T  
o]#Q6J  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; !mL,Ue3/  
ac.O#6&  
  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; \E.t=XBn  
14\%2nE  
  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; .]ZM2  
{mL/)\  
  5、 添加代码,编译运行程序。 ORa!84L  
&F\J%#{  
三、程序代码 9G_=)8sOV  
p'k stiB  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ~PvW+UMLk  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) FStE/2?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ?OKm~ Ek  
#if _MSC_VER > 1000 *6*#"#D  
#pragma once cFUYT$8>  
#endif // _MSC_VER > 1000 d^ !3bv*h  
#ifndef __AFXWIN_H__ UVu"meZX  
#error include 'stdafx.h' before including this file for PCH |dD!@K  
#endif  -/  
#include "resource.h" // main symbols 3HbHl?-UNU  
class CHookApp : public CWinApp Xkl^!,  
{ 4PiNQ'*  
 public: XoSjYG(>,  
  CHookApp(); Bx&` $lW  
  // Overrides 0 P/A  
  // ClassWizard generated virtual function overrides O( he  
  //{{AFX_VIRTUAL(CHookApp) ~B(]0:  
 public: d5A!kU _.  
  virtual BOOL InitInstance(); Z;S*fS-_  
  virtual int ExitInstance(); q~trn'X>  
  //}}AFX_VIRTUAL |!%A1 wp#  
  //{{AFX_MSG(CHookApp) *U54x /w|  
  // NOTE - the ClassWizard will add and remove member functions here. QVn0!R{  
  // DO NOT EDIT what you see in these blocks of generated code ! { r&M  
  //}}AFX_MSG -xXNzC   
  DECLARE_MESSAGE_MAP() d(wqKiGwe  
}; wt2S[:!p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 3N+P~v)T'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZX-9BJ`Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4Bx1L+Cg  
BOOL InitHotkey(); Z(K[oUJx  
BOOL UnInit(); NH 'RU`U)  
#endif +7 F7Kh  
H.idL6*G  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. P+}qaup  
#include "stdafx.h" q'(WIv@  
#include "hook.h" (dMFYL>YP  
#include <windowsx.h> -(cm  
#ifdef _DEBUG #]lUJ &M}e  
#define new DEBUG_NEW &K>]!yn   
#undef THIS_FILE X""'}X|O  
static char THIS_FILE[] = __FILE__; oTI*mGR1Z  
#endif TP{a*ke^5,  
#define MAX_KEY 100 sxThz7#i)  
#define CTRLBIT 0x04 |~ \K:[T&  
#define ALTBIT 0x02 !a~x |pjJ  
#define SHIFTBIT 0x01 4 >&%-BhN  
#pragma data_seg("shareddata") K+v 250J$-  
HHOOK hHook =NULL; #0`"gR#+  
UINT nHookCount =0; ynOp7ZN$  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 1r~lh#_8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT l7s=b4}c  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey k 5"3*  
static int KeyCount =0; Ka_UVKwMro  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift G)# ,39P  
#pragma data_seg() R1Pnj  
HINSTANCE hins; S_bay8L1  
void VerifyWindow(); @0 -B&w  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) -m|b2g}"3  
//{{AFX_MSG_MAP(CHookApp) rG\m]C3E  
// NOTE - the ClassWizard will add and remove mapping macros here. Czv lZDo  
// DO NOT EDIT what you see in these blocks of generated code! m/eGnv;!  
//}}AFX_MSG_MAP On'3K+(_  
END_MESSAGE_MAP() 6km u'vw  
fykN\b  
CHookApp::CHookApp() x *qef_Hu  
{ xh-[]Jz(  
 // TODO: add construction code here, H <1?<1^  
 // Place all significant initialization in InitInstance #Ejly2C,  
} $--PA$H27  
21o_9=[^  
CHookApp theApp; E*w 2yWR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /t>o -  
{ EPa3Yb?BGb  
 BOOL bProcessed=FALSE; |ni cvg@  
 if(HC_ACTION==nCode) mCz6&  
 { +XpRkX&-  
  if((lParam&0xc0000000)==0xc0000000){// Key up WHNb.>  
   switch(wParam) .vW~(ZuD  
   { 4|2$b:t  
    case VK_MENU: VBH[aIW  
     MaskBits&=~ALTBIT; 'nT#3/rL  
     break; o[v`Am?v  
    case VK_CONTROL: . \d0lJSr  
     MaskBits&=~CTRLBIT; |iwTzlt*#  
     break; g$ 2M|Q  
    case VK_SHIFT: .R gfP'M  
     MaskBits&=~SHIFTBIT; cw5YjQ8 9  
     break; L}21[ N~ky  
    default: //judge the key and send message i*^K)SI8  
     break; <oXsn.'\  
   } D46| )-  
   for(int index=0;index<MAX_KEY;index++){ 8uT6QCf  
    if(hCallWnd[index]==NULL) ?s?uoZ /2  
     continue; QE#$bCw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =TP>Y"  
    { [e}]K:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ky~x4_y5  
     bProcessed=TRUE; &(rd{j/*  
    } }w-`J5Eq#  
   } >bZ#  
  } qXhrK /  
  else if((lParam&0xc000ffff)==1){ //Key down OK)0no=OAK  
   switch(wParam) X,fTzkGj  
   { IWWFl6$-  
    case VK_MENU: kdHql>0  
     MaskBits|=ALTBIT; f9Xw]G9  
     break; %om7h$D =`  
    case VK_CONTROL: E1C8yIF  
     MaskBits|=CTRLBIT; >WDpBn:  
     break; gK<-*v  
    case VK_SHIFT: h4qR\LX  
     MaskBits|=SHIFTBIT; gU~)(|Nu.  
     break; up1aFzY|6x  
    default: //judge the key and send message Ue8D:C M  
     break; 3> (`Y  
   } os.x|R]_  
   for(int index=0;index<MAX_KEY;index++) UA9LI<Y  
   { YiJu48J  
    if(hCallWnd[index]==NULL) t<k8.9 M$  
     continue; .Ep3~9TBW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) < 5PeI  
    { :$tW9*\KY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^0&] .m  
     bProcessed=TRUE; m2! 7M%]GC  
    } *nc4X9  
   } {DK:"ep  
  } 2)A D'  
  if(!bProcessed){ KCT8Q!\  
   for(int index=0;index<MAX_KEY;index++){ vj b?N  
    if(hCallWnd[index]==NULL) D1n2Z :9  
     continue; OKqpc;y:D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :acQK=fe  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  %aKkk)s  
   } 5ZcnZlOOQ  
  } @Y,F&8a$  
 } gQEV;hCO  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,$]q2aL  
} %_[-[t3  
oB\Xl)A<  
BOOL InitHotkey() yq}{6IyZ^  
{ K;qZc\q  
 if(hHook!=NULL){ ` Z/ IW  
  nHookCount++; q KM]wu0Et  
  return TRUE; ?R(3O1,v^  
 } :#/bA&  
 else vO_quQ[.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); c7F&~RLC  
  if(hHook!=NULL) X w8i l  
   nHookCount++; .vv*bx   
  return (hHook!=NULL); 8j'*IRj*q  
} 752wK|o0|;  
BOOL UnInit() vdm?d/0(^  
{ wB)+og-^1f  
 if(nHookCount>1){ is(!_Iv  
  nHookCount--; \uk#pL  
  return TRUE; 9^^#I ~-  
 } W~%~^2g ;k  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 5u46Vl{  
 if(unhooked==TRUE){ qX(%Wn;n  
  nHookCount=0; o x^lI  
  hHook=NULL; aAri  
 } "Y!dn|3  
 return unhooked; 4l''/$P  
}  YBD{l  
AD\<}/3U  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L:M9|/  
{ .A\\v6@  
 BOOL bAdded=FALSE; xp&!Cl>C3\  
 for(int index=0;index<MAX_KEY;index++){ S=}~I  
  if(hCallWnd[index]==0){ sZ"U=6R  
   hCallWnd[index]=hWnd; [kOA+\v  
   HotKey[index]=cKey; x+cF1 N2.  
   HotKeyMask[index]=cMask; H/k W :k  
   bAdded=TRUE; /6?plt&CA  
   KeyCount++; y!gM)9vq  
   break; j7 =3\SO  
  } `yAo3A9vk  
 } [M^[61  
 return bAdded; ;g:bn5G  
} :BX{ *P  
$NT9LtT@K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) i)L:VkN  
{ pRvs;klf  
 BOOL bRemoved=FALSE; ;8i L,^.A  
 for(int index=0;index<MAX_KEY;index++){ ~ n^G<iXLp  
  if(hCallWnd[index]==hWnd){ 0f%:OU5Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;_/q>DR>,3  
    hCallWnd[index]=NULL; 8 %j{4$  
    HotKey[index]=0; C 94@YWs  
    HotKeyMask[index]=0; nV3 7` I  
    bRemoved=TRUE; Tr0V6TS7  
    KeyCount--; 6I.mc  
    break; LU,"i^T  
   } " ^baiN@ac  
  } i=UTc1  
 } 9r nk\`E  
 return bRemoved; em [F|  
} "O[76}I+.q  
^<\} Y  
void VerifyWindow() Sz|CreFK16  
{ +.]}f}Y  
 for(int i=0;i<MAX_KEY;i++){ G}#/`]o!K  
  if(hCallWnd!=NULL){ +MZO%4  
   if(!IsWindow(hCallWnd)){ p@Y$eZ:O  
    hCallWnd=NULL; &}0wzcMg  
    HotKey=0; TucAs 0-bF  
    HotKeyMask=0; g0j4<\F2\  
    KeyCount--; loUwR z  
   } ` G=L07  
  } )H9*NB8%  
 } =O#AOw`  
} rz }l<t~H  
0BB @E(*  
BOOL CHookApp::InitInstance() rm=~^eB  
{ :{s%=\k {d  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); g#b u_E61B  
 hins=AfxGetInstanceHandle(); X$ B]P 7G7  
 InitHotkey(); k!/ _/^{  
 return CWinApp::InitInstance(); 1Bk*G>CX9(  
} e( o/we{  
R96o8#7Uv  
int CHookApp::ExitInstance() IR dz(~CP  
{ z8(R.TB  
 VerifyWindow(); y)/$ge _U  
 UnInit(); };m7FO  
 return CWinApp::ExitInstance(); NhoS7 y(  
} fuD1U}c  
.Spi$>v  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file QHzX 5$IM  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) xbrmPGpW$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {vT55i<mk  
#if _MSC_VER > 1000 ab aQJ|  
#pragma once |5IY`;+9  
#endif // _MSC_VER > 1000 )~.&bEm\  
W,/C?qFp  
class CCaptureDlg : public CDialog o`K^Wy~+k#  
{ 6eUiI@J  
 // Construction G#n^@kc*,  
 public: Sd\IGy{a  
  BOOL bTray; K-EI?6`xM  
  BOOL bRegistered; jqGo-C~  
  BOOL RegisterHotkey(); 0"^oTmQN  
  UCHAR cKey; 9U<)_E<y  
  UCHAR cMask; JXY!c\,  
  void DeleteIcon(); `H2F0{\og  
  void AddIcon(); CoUd16*"JM  
  UINT nCount; @CaD8%j{  
  void SaveBmp(); B~!G lT  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]tQDk4&i  
  // Dialog Data  6I cM:x  
  //{{AFX_DATA(CCaptureDlg) A-7wkZ.H  
  enum { IDD = IDD_CAPTURE_DIALOG }; *%N7QyO`I  
  CComboBox m_Key; F%.9f Uo  
  BOOL m_bControl; v!#`W  
  BOOL m_bAlt; B!r48<p  
  BOOL m_bShift; pl#o!j(i  
  CString m_Path; ^wO_b'@v  
  CString m_Number; UJz4>JF  
  //}}AFX_DATA RC8)f8n  
  // ClassWizard generated virtual function overrides ^KZAYB9C  
  //{{AFX_VIRTUAL(CCaptureDlg) *)NR$9lGv  
 public: B)DC,+@$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Jl> at  
 protected: StyB"1y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  w{ r(F`  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); nrS[7~  
  //}}AFX_VIRTUAL LN.Bd,  
  // Implementation  bL'#  
 protected: 4VmCW"b7h  
  HICON m_hIcon; d7 gH3 l  
  // Generated message map functions #U$YZ#B  
  //{{AFX_MSG(CCaptureDlg) X&9^&U=e  
  virtual BOOL OnInitDialog(); b>bgUDq  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); uq|vNLW26  
  afx_msg void OnPaint(); Lov.E3S6;  
  afx_msg HCURSOR OnQueryDragIcon(); 3%[)!zKv  
  virtual void OnCancel(); z[5Y Z~}*  
  afx_msg void OnAbout(); [/AdeR  
  afx_msg void OnBrowse(); k,;lyE  
  afx_msg void OnChange(); Pu$kj"|q*[  
 //}}AFX_MSG Krp <bK6  
 DECLARE_MESSAGE_MAP() Zr.\`mG4f  
}; vNC$f(cQ  
#endif =wIdC3Ph  
yp[<9%Fi  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 'z +$3\5L  
#include "stdafx.h" ez^*M:K  
#include "Capture.h" + 9\:$wMN  
#include "CaptureDlg.h" 8Fd1;G6  
#include <windowsx.h> +Mk*{ A t  
#pragma comment(lib,"hook.lib") sd]54&3A  
#ifdef _DEBUG 3 ^02fy  
#define new DEBUG_NEW FI?gT  
#undef THIS_FILE %Ye)8+-  
static char THIS_FILE[] = __FILE__; b:FEp'ZS  
#endif bl" (<TM  
#define IDM_SHELL WM_USER+1 9<t9a f\.>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J|gdO+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A*\o c  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; tA! M  
class CAboutDlg : public CDialog 79{.O`v  
{ MPKpS3VS  
 public: ~j/bCMEf!  
  CAboutDlg(); 1N!Oslum  
  // Dialog Data 4;BW  
  //{{AFX_DATA(CAboutDlg) F@=e2e 4  
  enum { IDD = IDD_ABOUTBOX }; }[>RxHd  
  //}}AFX_DATA 1P[I}GW#  
  // ClassWizard generated virtual function overrides 2 ?Pt Z  
  //{{AFX_VIRTUAL(CAboutDlg) Q$xa  
 protected: Em~7D ]Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V17>j0Ev$W  
  //}}AFX_VIRTUAL 9tzoris[~  
  // Implementation }zkL[qu;  
 protected: c!\.[2n  
  //{{AFX_MSG(CAboutDlg) jw/'*e  
  //}}AFX_MSG C<[d  
  DECLARE_MESSAGE_MAP() w8 ?Pb$Fe  
}; mP9cBLz  
q Z8|B  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) G0I~&?nDa  
{ TJHN/Z/  
 //{{AFX_DATA_INIT(CAboutDlg) 8%;}LK  
 //}}AFX_DATA_INIT <Jwi ~I=^  
} 6 WA|'|}=  
1.Haf  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) t{/:(Nu  
{ p!HPp Ef+#  
 CDialog::DoDataExchange(pDX); H!unIy|  
 //{{AFX_DATA_MAP(CAboutDlg) M|/oFV  
 //}}AFX_DATA_MAP Np.no$_  
} Z B~l2  
rnnX|}J  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) "%{,T  
 //{{AFX_MSG_MAP(CAboutDlg) Tg"' pO  
 // No message handlers ]LEoOdDN"C  
 //}}AFX_MSG_MAP 6uu^A9x  
END_MESSAGE_MAP() ^y&q5p jj  
o2;(VSKhS  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |RR"'o_E  
: CDialog(CCaptureDlg::IDD, pParent) ~hS3*\^~M  
{ ;Ay >+M2O  
 //{{AFX_DATA_INIT(CCaptureDlg) ~ A^E  
  m_bControl = FALSE; G;2R]H#p  
  m_bAlt = FALSE; -Nsk}Rnk*  
  m_bShift = FALSE; 44\!PYf7  
  m_Path = _T("c:\\"); 6N9 c<JC  
  m_Number = _T("0 picture captured."); b->eg 8|  
  nCount=0; 1pd 9s8CA  
  bRegistered=FALSE; S:/{  
  bTray=FALSE; 7n\ThfH{  
 //}}AFX_DATA_INIT \:]DFZ=!  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 f'1(y\_fb  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); c*N50%=4  
} x1t{SQ-C  
!cRfZ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 8{R&EijC  
{ ?TIV2m^?  
 CDialog::DoDataExchange(pDX); w?kGi>7E  
 //{{AFX_DATA_MAP(CCaptureDlg) [dl+:P:zc  
  DDX_Control(pDX, IDC_KEY, m_Key); 7sXy`+TZ->  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); j'3j}G%\T  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ec`bz "1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ,%A)"doaG  
  DDX_Text(pDX, IDC_PATH, m_Path); bRWIDPh  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8V6=i'GK  
 //}}AFX_DATA_MAP r)gCTV(kb  
} hdo&\Q2D8  
i][f#e4  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) RG&I\DTyt  
//{{AFX_MSG_MAP(CCaptureDlg) }-d)ms!  
 ON_WM_SYSCOMMAND() EbCIIMbe"  
 ON_WM_PAINT() K'x4l,rq  
 ON_WM_QUERYDRAGICON() `q%U{IR  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) y|^EGnaE  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T_eJ}(p  
 ON_BN_CLICKED(ID_CHANGE, OnChange) VLiIO"u;  
//}}AFX_MSG_MAP 9*4 .  
END_MESSAGE_MAP() *dN N<  
q^5yk=2fq  
BOOL CCaptureDlg::OnInitDialog() :d.1;st  
{ <O.Kqk* nq  
 CDialog::OnInitDialog(); gdl| ^*tc  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >L8?=>>?\  
 ASSERT(IDM_ABOUTBOX < 0xF000); os[ZIHph  
 CMenu* pSysMenu = GetSystemMenu(FALSE); M~als3  
 if (pSysMenu != NULL) RoX &+~  
 { RL6Vkd?  
  CString strAboutMenu; 4AQ[igTDP  
  strAboutMenu.LoadString(IDS_ABOUTBOX); auRY|j  
  if (!strAboutMenu.IsEmpty()) /-Wuq`P/ T  
  { "l TZ|k^  
   pSysMenu->AppendMenu(MF_SEPARATOR); 'qjX$]H  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~F;CE"3A  
  } ?KCivf  
 } {J2#eiF  
 SetIcon(m_hIcon, TRUE); // Set big icon Zb."*zL  
 SetIcon(m_hIcon, FALSE); // Set small icon U 2bzUxK  
 m_Key.SetCurSel(0); .l \r9I(  
 RegisterHotkey(); $ADPV,*gG  
 CMenu* pMenu=GetSystemMenu(FALSE); "qawq0P8Z  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7Re-5vz R  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); BBxc*alG0  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); rIVvO  
 return TRUE; // return TRUE unless you set the focus to a control )Ob]T{GY  
} X'f)7RbT  
?mMW*ico  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :s"2Da3B  
{ wZ jlHe  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) fp{G|.SA  
 { 8.yCA  
  CAboutDlg dlgAbout; ZZ("-#?  
  dlgAbout.DoModal(); #F!Kxks  
 } fz3lR2~G  
 else {(}yG_Q]!  
 { ys%zlbj[  
  CDialog::OnSysCommand(nID, lParam); !4t`Hv?'  
 } vG~+r<:  
} B!}BM}r  
hk_g2g  
void CCaptureDlg::OnPaint() oSY7IIf%L  
{ -(9O6)Rs$  
 if (IsIconic()) 7Lg7ei2mN7  
 { } Gr&w-v  
  CPaintDC dc(this); // device context for painting d`Oe_<  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); xIL#h@dz  
  // Center icon in client rectangle .xl.P7@JJ  
  int cxIcon = GetSystemMetrics(SM_CXICON); +Rqbf  
  int cyIcon = GetSystemMetrics(SM_CYICON); |c0,  
  CRect rect; 4z_n4=  
  GetClientRect(&rect); @r<b:?u  
  int x = (rect.Width() - cxIcon + 1) / 2; 26.)Ur<F  
  int y = (rect.Height() - cyIcon + 1) / 2; &tj0M.-  
  // Draw the icon 6aY>lkp  
  dc.DrawIcon(x, y, m_hIcon);  q>-R3HB  
 } rLzW`  
 else FaY_ 0G;y  
 { \0?$wIH?  
  CDialog::OnPaint(); 3+>OGwfQ  
 } a8Uk[^5  
} 2 n)gpLIJ  
d)tiO2W  
HCURSOR CCaptureDlg::OnQueryDragIcon() HTk\723Rdw  
{ >3PMnI  
 return (HCURSOR) m_hIcon; ?YBaO,G9o  
} ]g,lRG  
J\=a gQ  
void CCaptureDlg::OnCancel() Xwq]f :@V  
{ j;\[pg MR/  
 if(bTray) d>|;f  
  DeleteIcon(); q@l(Qol  
  CDialog::OnCancel(); m[:K"lZ ]2  
} ]-:6T0JuS  
w2OsLi Sv  
void CCaptureDlg::OnAbout() sn"fK=,#g  
{ {<K=*r rZ  
 CAboutDlg dlg; 9x?'}  
 dlg.DoModal(); ZzcPiTSO  
} gn)R^  
){P^P!s$  
void CCaptureDlg::OnBrowse() ?pG/m%[  
{ =45W\  
 CString str; kRlA4h1u_$  
 BROWSEINFO bi; q]FBl}nwl%  
 char name[MAX_PATH]; 9S>g6}[E#0  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); +sf .PSz$  
 bi.hwndOwner=GetSafeHwnd(); d1]i,C~Y  
 bi.pszDisplayName=name; H0>yi[2f  
 bi.lpszTitle="Select folder"; f~ZEdq8  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; hw=GR_,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); SK R1E];4  
 if(idl==NULL) %e? fH.)  
  return; Td hTQ  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }mk>!B}=  
 str.ReleaseBuffer(); r N5tI.iC  
 m_Path=str; q3h'l,  
 if(str.GetAt(str.GetLength()-1)!='\\') 4 1t)(+r  
  m_Path+="\\"; ;>>C)c4V"  
 UpdateData(FALSE); cyQBqG  
} =a$Oecg?  
}k7'"`#?"  
void CCaptureDlg::SaveBmp() ->gZ)?Fqy  
{ KX4],B5 +  
 CDC dc; 5iM[sg[y9  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3t" 4TjAy  
 CBitmap bm; 6 BAW  
 int Width=GetSystemMetrics(SM_CXSCREEN); vt1lR5  
 int Height=GetSystemMetrics(SM_CYSCREEN); !{Z~<Ky  
 bm.CreateCompatibleBitmap(&dc,Width,Height); LFf`K)q  
 CDC tdc; QyGnDomQ  
 tdc.CreateCompatibleDC(&dc); h`Tz5% n  
 CBitmap*pOld=tdc.SelectObject(&bm); L/Vx~r`P  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 38IMxd9v  
 tdc.SelectObject(pOld); &<]<a_pw  
 BITMAP btm; :iPy m}CE  
 bm.GetBitmap(&btm); )9L/sKz  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :O-1rD  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +L%IG  
 BITMAPINFOHEADER bih; Hd &{d+B  
 bih.biBitCount=btm.bmBitsPixel; C6  "  
 bih.biClrImportant=0; ,6,]#R :J  
 bih.biClrUsed=0; m3.sVI0I  
 bih.biCompression=0; _}gtcyx  
 bih.biHeight=btm.bmHeight; v }\,o%t^  
 bih.biPlanes=1; *%gF2@=r8F  
 bih.biSize=sizeof(BITMAPINFOHEADER); )rm4cW_  
 bih.biSizeImage=size; Or0O/\D)  
 bih.biWidth=btm.bmWidth; M.[rLJZ4  
 bih.biXPelsPerMeter=0; EWj gI_-  
 bih.biYPelsPerMeter=0; "%6/a7S  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); V/%~F6e  
 static int filecount=0; V diJ>d[  
 CString name; #FH[hRo=6  
 name.Format("pict%04d.bmp",filecount++); "r'ozf2 \  
 name=m_Path+name; |E)aT#$f'  
 BITMAPFILEHEADER bfh; OW@\./nM  
 bfh.bfReserved1=bfh.bfReserved2=0; '0Q,  
 bfh.bfType=((WORD)('M'<< 8)|'B');  QLKK.]  
 bfh.bfSize=54+size; HM9fjl[  
 bfh.bfOffBits=54; ej(ikj~j  
 CFile bf; <AoXEu D  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @n+=vC.xO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?cy4&]s  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `{Tk@A_yd  
  bf.WriteHuge(lpData,size); $8~e}8dt|  
  bf.Close(); v]VWDT `  
  nCount++; 1iBP,:>*  
 } jZ*WN|FK?  
 GlobalFreePtr(lpData); s!B/WsK  
 if(nCount==1) ~AB*]Us  
  m_Number.Format("%d picture captured.",nCount); \jU |(DE  
 else O XP\R  
  m_Number.Format("%d pictures captured.",nCount); I]`-|Q E  
  UpdateData(FALSE); gVR@&bi7  
} v|';!p|  
^Q}eatEn  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) #UP~iHbt\  
{ Ond'R'3\E  
 if(pMsg -> message == WM_KEYDOWN) WT\<.Py  
 { YN/ }9.  
  if(pMsg -> wParam == VK_ESCAPE) OF U/gaO~  
   return TRUE; {KL5GowH  
  if(pMsg -> wParam == VK_RETURN) ,  X{>  
   return TRUE; Zu*K-ep"  
 } sW@krBxMv  
 return CDialog::PreTranslateMessage(pMsg); F7*wQ{~  
} aHzHvl  
+-?/e-z")  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zZ-\a[F  
{ u9qMqeF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ f58?5(Dc|  
  SaveBmp(); 1fU,5+PH  
  return FALSE; {R6HG{"IS6  
} 0%`4px4J  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ XzIx:J6  
 CMenu pop; )?! [}t  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); V9NTs8LKc  
 CMenu*pMenu=pop.GetSubMenu(0); T1WWK'  
 pMenu->SetDefaultItem(ID_EXITICON); 5s{j = .O  
 CPoint pt; 8hanzwoJ:  
 GetCursorPos(&pt); EbNd=Z'J  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); J9~i%hzr  
 if(id==ID_EXITICON)  l! bv^  
  DeleteIcon(); i]{1^pKq  
 else if(id==ID_EXIT) 3>M&D20Z  
  OnCancel(); !U%T&?E l  
 return FALSE;  >w6taX  
} >o,^b\  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); /#NYi,<{X  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) W!Gdf^Yy<  
 AddIcon(); (.Y/  
 return res; rh*sbZ68>E  
} 1Tp/MV/>  
$g9**b@  
void CCaptureDlg::AddIcon() oPf)be| #  
{ KL,/2 (  
 NOTIFYICONDATA data; _*M42<wcO  
 data.cbSize=sizeof(NOTIFYICONDATA); g`^X#-!(  
 CString tip; ^"\s eS  
 tip.LoadString(IDS_ICONTIP); 8 )*2@-Rp  
 data.hIcon=GetIcon(0); )j l 8!O7  
 data.hWnd=GetSafeHwnd(); VSX@e|Nj  
 strcpy(data.szTip,tip); K6JVg$  
 data.uCallbackMessage=IDM_SHELL; ]  ]U<UJ  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Z4K+ /<I  
 data.uID=98; =<@2#E)  
 Shell_NotifyIcon(NIM_ADD,&data); ! |waK~jK  
 ShowWindow(SW_HIDE); ?4H#G)F  
 bTray=TRUE; Z6C=T;w  
} @oP_;G  
#65^w=Sp}  
void CCaptureDlg::DeleteIcon() ? 8aaD>OR$  
{ e>rRTN  
 NOTIFYICONDATA data; wBj-m  
 data.cbSize=sizeof(NOTIFYICONDATA); 2| iV,uJ&  
 data.hWnd=GetSafeHwnd(); \2-@'^i  
 data.uID=98; N;oQ^B'  
 Shell_NotifyIcon(NIM_DELETE,&data); xiF7}]d+  
 ShowWindow(SW_SHOW); k,F"-K+M  
 SetForegroundWindow(); `A$!]&[~|  
 ShowWindow(SW_SHOWNORMAL); 6DTTV66  
 bTray=FALSE; %q ;jVj[  
} Psura$:  
u9woEe?  
void CCaptureDlg::OnChange() Jq.lT(E8D  
{ O=cxNy-I  
 RegisterHotkey(); u6V/JI}g  
} s'aip5P  
wFh8?Z3u_  
BOOL CCaptureDlg::RegisterHotkey() }T^cEfX  
{ =;a!u  
 UpdateData(); Di_2Plo)4  
 UCHAR mask=0; 5wao1sd#  
 UCHAR key=0; !rDdd%Z  
 if(m_bControl) D%mXA70  
  mask|=4; W1Lr_z6  
 if(m_bAlt) +6$g! S5{  
  mask|=2; 8(g:HR*;  
 if(m_bShift) b+-f.!j  
  mask|=1; XKA&XpF  
  key=Key_Table[m_Key.GetCurSel()]; 5vAf7\*  
 if(bRegistered){ @oF$LMD  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ]r! >{  
  bRegistered=FALSE; i@5[FC  
 } HW4 .zw  
 cMask=mask; >Iewx Gb>  
 cKey=key; qSqI7ptA\  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); keW~ NM  
 return bRegistered; PP~rn fE  
} 0_P}z3(M  
anw}w !@U  
  四、小结 g[ 0<m#"  
v0Dq@Q1  
  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
温馨提示:欢迎交流讨论,请勿纯表情、纯引用!
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八