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
  • 7582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: 3,8>\yf`  
  ^+zF;Q'  
  一、实现方法 }fW@8ji\  
s[ |sfqB1`  
  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: 2*6b{}yJH  
/jQW4eW0  
#pragma data_seg("shareddata") y K~;LV  
HHOOK hHook =NULL; //钩子句柄 LYPjdp2>"o  
UINT nHookCount =0; //挂接的程序数目 W'2|hP  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 0/d+26lR  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 /s3AZ j9  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey m$xL#omD  
static int KeyCount =0; }g:y!p k  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 nz:I\yA  
#pragma data_seg() (&4aebkZO  
q/Dc*Qn m  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 hPhNDmL#3  
`MAluu+b  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: r5XG$:$8\  
i DV.L  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR %D|27gh  
cKey,UCHAR cMask) (MiEXU~v  
{ j?ihUNY!+  
 BOOL bAdded=FALSE; jN:!V t  
 for(int index=0;index<MAX_KEY;index++){ Ycypd\q/  
  if(hCallWnd[index]==0){ 4oT1<n`r+  
   hCallWnd[index]=hWnd; PW"G]G,  
   HotKey[index]=cKey; xQX,1NbH5  
   HotKeyMask[index]=cMask; 7a Fvj  
   bAdded=TRUE; zhbp"yju7  
   KeyCount++; 9 WsPBzi"T  
   break; Ep/4o< N(  
  } s5T$>+ a  
 } `#&pB0.y  
 return bAdded; &B\tcF  
} F gM<2$h  
//删除热键 Q}~of}h/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LuQ4TT  
{ 1>OfJc(K  
 BOOL bRemoved=FALSE; $ Scb8<  
 for(int index=0;index<MAX_KEY;index++){ RwMK%^b  
  if(hCallWnd[index]==hWnd){ hM")DmvB4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ vr<6j/ty  
    hCallWnd[index]=NULL; $}0q=Lg%wv  
    HotKey[index]=0; %"~\Pu*>  
    HotKeyMask[index]=0; "Zd4e2>{M\  
    bRemoved=TRUE; B#'TF?HUEn  
    KeyCount--; Tx%6whd/'  
    break; &K5wCNX1  
   } 8Czy<}S<G  
  } ;hi+.ng_  
 } r- 0BLq]~{  
 return bRemoved; i|PQNhUe  
} 6k"'3AKaR  
/w0l7N  
O;c;>x_dA  
  DLL中的钩子函数如下: Q.H y"~  
nYG$V)iCb  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) l\7NR  
{ '+ 1<7jl&I  
 BOOL bProcessed=FALSE; K2,oP )0.Y  
 if(HC_ACTION==nCode) EotZ$O=  
 { (#FWA<o  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,@ A1eX}  
   switch(wParam) sXp>4MomV  
   {  Mi&,64<  
    case VK_MENU: )NJD+yQ%  
     MaskBits&=~ALTBIT; z5-vx`  
     break; Z.+-MNWV  
    case VK_CONTROL: 6>ZUx}vYj  
     MaskBits&=~CTRLBIT; <d~P;R(@  
     break; 8MgoAX,p  
    case VK_SHIFT: )tGeQXVhbJ  
     MaskBits&=~SHIFTBIT; XYIZ^_My  
     break; [8AGW7_  
    default: //judge the key and send message 9,=3D2x&  
     break; Y<M,/Y_ !  
   } J >Zd0Dn  
   for(int index=0;index<MAX_KEY;index++){ [=079UN-X  
    if(hCallWnd[index]==NULL) O1IR+"0  
     continue; =M^4T?{T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =8S*t5  
    { =,&PD(.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); j(mbUB*  
     bProcessed=TRUE; `#B|l+baq  
    } #4"(M9kf  
   }  $6w[h7  
  } !qPVC\l  
  else if((lParam&0xc000ffff)==1){ //有键按下 Cw]& B  
   switch(wParam) {LfVV5?  
   { <CIJ g*  
    case VK_MENU: ko\VDyt,  
     MaskBits|=ALTBIT; v'0A$`w`  
     break; Ovh  
    case VK_CONTROL: z?`&HU Nf  
     MaskBits|=CTRLBIT; P.mz$M  
     break; -o*IJQ_  
    case VK_SHIFT: "1>I/CM  
     MaskBits|=SHIFTBIT; AFO g*{1  
     break; }z6@Z#%q  
    default: //judge the key and send message YG ,  
     break; 3 RG*:9  
   } ;$Q `JN=  
   for(int index=0;index<MAX_KEY;index++){ Lbk?( TL  
    if(hCallWnd[index]==NULL) 3a #2 }  
     continue; ?WE#%W7U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n[ip'*2L  
    { V8ka*VJ(B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;n_|t/=  
     bProcessed=TRUE; Gqq%q!k&1  
    }  f.acH]p  
   } PPO*&=!]  
  } a5jc8S>  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Pn|A>.)z  
   for(int index=0;index<MAX_KEY;index++){ B}_*0D  
    if(hCallWnd[index]==NULL) uu L"o  
     continue; 89T xd9X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) XB*)d 9'8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3wK{?  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 x!GHUz*:uz  
   } (hej 3;W  
  } U 2am1}  
 } @qk$ 6X  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P3X;&iT  
} !'uL  
V(Ll]g/T_;  
  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: b,"gBg  
- &u]B$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yq+'O&+   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h`n,:Y^++P  
 (c;F%m|  
  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: -Yx'qz@  
 gSQq  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }&A!h  
{ $5kb3x<W  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) vgY ) L  
 { a^_\#,}  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =.`(KXT  
  SaveBmp(); .lnyn|MVb  
  return FALSE; a@:(L"Or  
 } :VpRpj4f  
 …… //其它处理及默认处理  734)s  
} d_s=5+Yj  
94 58.!3  
+{U0PI82  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 #DK@&Gv  
^\=<geEj  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ) =-$>75Z  
vYQ0e:P  
  二、编程步骤 $SAq/VHI1]  
;8\w$SPP  
  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"; _b8&$\>  
A;ip V :)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; pw|f4c7AH  
B1)gudP`  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; +(n&>7 5  
?O3E.!Q|  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; q5C(/@)^  
~L\KMB/9e=  
  5、 添加代码,编译运行程序。 #M kXio; h  
-7E)u  
三、程序代码 "TW%-67  
y#F`yXUj  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL pu#h:nb>88  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 02B *cz_K  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ D2N| A  
#if _MSC_VER > 1000 K8[vJ7(!|  
#pragma once 3!E*h0$}  
#endif // _MSC_VER > 1000 ZL/iX~}a'  
#ifndef __AFXWIN_H__ <q@/ Yy32  
#error include 'stdafx.h' before including this file for PCH #1fT\aP  
#endif t;005]'Mp  
#include "resource.h" // main symbols BfZAK0+*$  
class CHookApp : public CWinApp 3 RB+  
{ >np!f8+d"q  
 public: )!SA]>-  
  CHookApp(); 'fpm] *ig  
  // Overrides |f5WN&c  
  // ClassWizard generated virtual function overrides 32h}+fd  
  //{{AFX_VIRTUAL(CHookApp) dH:z _$Mg  
 public: <u "xHl8Io  
  virtual BOOL InitInstance(); 4<%(Y-_sF  
  virtual int ExitInstance(); Y%<y`]I  
  //}}AFX_VIRTUAL eS(hLXE!7  
  //{{AFX_MSG(CHookApp) `pr$l  
  // NOTE - the ClassWizard will add and remove member functions here. 7#/->Y  
  // DO NOT EDIT what you see in these blocks of generated code ! sG-$d\ 1d  
  //}}AFX_MSG 8<V6W F`e  
  DECLARE_MESSAGE_MAP()  NGQBOV  
}; <ZmC8&Uo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); dy/\>hu  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Jr|"QRC  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~,#zdm1r@  
BOOL InitHotkey(); : :;YS9e  
BOOL UnInit(); aumWU{j=  
#endif BK>3rjXi>a  
{jz?LM  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. yM* CA,(c  
#include "stdafx.h"  TA;r  
#include "hook.h" WX.6|  
#include <windowsx.h> QuFzj`(  
#ifdef _DEBUG VF#2I %R*  
#define new DEBUG_NEW o[=h=&@5p  
#undef THIS_FILE wJ.?u]f@  
static char THIS_FILE[] = __FILE__; K]c|v i_D  
#endif kyV!ATL1F  
#define MAX_KEY 100 vh+ ' W  
#define CTRLBIT 0x04 ,uz+/K%OA5  
#define ALTBIT 0x02 /G[2   
#define SHIFTBIT 0x01 \ a}6NIo  
#pragma data_seg("shareddata") ~x67v+I  
HHOOK hHook =NULL; 2;8I0BH*'  
UINT nHookCount =0; [l~Gwaul>  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ng,64(wOY  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |#OMrP+oi  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ,_SE!iL  
static int KeyCount =0; #B_Em$  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 2=R}u-@6p  
#pragma data_seg() W=QT-4  
HINSTANCE hins; r.-U=ql  
void VerifyWindow(); UXs=7H".  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Cn\5Vyrl  
//{{AFX_MSG_MAP(CHookApp) SNLZU%jan  
// NOTE - the ClassWizard will add and remove mapping macros here. sd(Yr6~..  
// DO NOT EDIT what you see in these blocks of generated code! jVW .=FK  
//}}AFX_MSG_MAP ^wnlZ09J  
END_MESSAGE_MAP() %w9/ gD  
%IAZU c  
CHookApp::CHookApp() ?HD eiJ kX  
{ [Eq7!_ 3  
 // TODO: add construction code here, |A .U~P):  
 // Place all significant initialization in InitInstance +V2\hq[{  
} %P3|#0yg0  
VIIBw  
CHookApp theApp; YgiLfz iT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <H; z4  
{ `5SLo=~  
 BOOL bProcessed=FALSE; Z~X\Z.  
 if(HC_ACTION==nCode) v w.rkAGY  
 { yM_ta '^$  
  if((lParam&0xc0000000)==0xc0000000){// Key up F+!w[}0  
   switch(wParam) %#AM }MWIa  
   { x6n(BMr  
    case VK_MENU:  F,hiKq*  
     MaskBits&=~ALTBIT; v8{ jEAK  
     break; Wi;wu*  
    case VK_CONTROL: B|fh 4FNy  
     MaskBits&=~CTRLBIT; v d{`*|x  
     break; c@|!0 U%j  
    case VK_SHIFT: *|Bu7nwg  
     MaskBits&=~SHIFTBIT; to2#PXf]y  
     break; ejF GeR  
    default: //judge the key and send message NE~R&ym9  
     break; ^-wdIu~p?  
   } # 1,"^k^  
   for(int index=0;index<MAX_KEY;index++){ 0c-.h  
    if(hCallWnd[index]==NULL) 6H ]rO3[8  
     continue; ~]w|ULNa3|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _ ^2\/@  
    { E%.w6-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i(Xz3L#(  
     bProcessed=TRUE; "d5nVO/  
    } d:<</ah  
   } pq T+lai)#  
  } ]3KMFV}  
  else if((lParam&0xc000ffff)==1){ //Key down 1QA{NAnu&  
   switch(wParam) Q<c{$o  
   { SlaHhq3  
    case VK_MENU: /r8'stRzv  
     MaskBits|=ALTBIT; s^&Oh*SP*  
     break; =/#+,  
    case VK_CONTROL: {s{ bnU  
     MaskBits|=CTRLBIT; _ArN[]Z  
     break; /W|=Or2oR  
    case VK_SHIFT: Y^Y1re+}  
     MaskBits|=SHIFTBIT; w'r?)WW$  
     break; R(^2+mV?  
    default: //judge the key and send message H^d2|E[D  
     break; #9/^)^k  
   } @$*LU:[  
   for(int index=0;index<MAX_KEY;index++) w;OvZo|  
   { 0[ BPmO6  
    if(hCallWnd[index]==NULL) t@#l0lu$  
     continue; 2 -C*RHRx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IG(1h+5 R(  
    { pzcl@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); o5(~nQ  
     bProcessed=TRUE; F ]x2;N  
    } xHpB/P~  
   } Gi+ZI{)  
  } W2`/z)[*>  
  if(!bProcessed){  Lw1aG;5  
   for(int index=0;index<MAX_KEY;index++){ ):L ; P)  
    if(hCallWnd[index]==NULL) AY(z9 &;6  
     continue; SDbR(oV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ovhd%qV;Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 'JpCS  
   } e[($rsx  
  } AE@N:a  
 } ll^#I/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _!ITCkBj  
} >qL-a*w:a  
f\vy5''  
BOOL InitHotkey() /\wm/Yx?S  
{ 'V`Hp$r  
 if(hHook!=NULL){ dR GgiQO  
  nHookCount++; ' X9D(?O  
  return TRUE; $&ZN%o3  
 } X~VJO|k pz  
 else s#* DY  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %+bw2;a6  
  if(hHook!=NULL) X4$86  
   nHookCount++; 1 k\~%  
  return (hHook!=NULL); U3tA"X.K  
} Ve9*>6i&-4  
BOOL UnInit() \s@7pM=(  
{ ;!9-I%e  
 if(nHookCount>1){ gLzQM3{X9  
  nHookCount--; ,3,(/%=k  
  return TRUE; LcW:vV|'K  
 } 7Ap==J{a  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Q~-MB]'  
 if(unhooked==TRUE){ RQ*oTsq  
  nHookCount=0; w7e+~8|  
  hHook=NULL; "/g\?Nce  
 } DlF6tcoI  
 return unhooked; zf.&E3Sn  
} + d289"  
"V3f"J?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [9H986=  
{ d8Sr,t+  
 BOOL bAdded=FALSE; YsA.,   
 for(int index=0;index<MAX_KEY;index++){ o/\f+iz7  
  if(hCallWnd[index]==0){ v2KK%Qy  
   hCallWnd[index]=hWnd; OaF[t*]D3  
   HotKey[index]=cKey; s;Sv@=\  
   HotKeyMask[index]=cMask; 1=Y pNXX  
   bAdded=TRUE; G|+naZ  
   KeyCount++; pRc<U^Z.h  
   break; C#oH7o+_.  
  } 7f_tH_(  
 } P>wTp)  
 return bAdded; )+dd  
} ~&%&Z  
f}ES8 Hh[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nJr:U2d  
{ \wb0%> 0  
 BOOL bRemoved=FALSE; @A1Ohl  
 for(int index=0;index<MAX_KEY;index++){ f2,\B6+  
  if(hCallWnd[index]==hWnd){ UC*\3:>'n  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ eZv G  
    hCallWnd[index]=NULL; ^b&U0k$R  
    HotKey[index]=0; ( SiwO.TZ  
    HotKeyMask[index]=0; X775j"<d  
    bRemoved=TRUE; 'nP;IuMP  
    KeyCount--; Xo/0lT  
    break; W</\F&  
   } \agT#tT J  
  } Scz/2vNi`  
 } .?dYY;P  
 return bRemoved; W_FN*Er  
} 3v,Bg4[i  
Br}0dha3E  
void VerifyWindow() :&\^r=D  
{ iT,Ya-9"  
 for(int i=0;i<MAX_KEY;i++){ R.)w l  
  if(hCallWnd!=NULL){ ]MaD7q>+R  
   if(!IsWindow(hCallWnd)){ S*Hv2sl  
    hCallWnd=NULL; CZ|h` ";P2  
    HotKey=0; lCxPR'C|  
    HotKeyMask=0; R7NE= X4  
    KeyCount--;  .H7xG'$  
   } F&)(G\  
  } x2$Y"b?vz  
 } <:!;79T\  
} kx6-8j3gD7  
`\M}~  
BOOL CHookApp::InitInstance() 5$<Ozkj(  
{ ~(Xzm  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); V:>ZSW4,^  
 hins=AfxGetInstanceHandle(); hw)#TEt   
 InitHotkey(); O]-s(8Oo3  
 return CWinApp::InitInstance(); 2/f!{lz](  
} BQF7S<O+  
Ek,$XH  
int CHookApp::ExitInstance() nv}z%.rRUj  
{ mgI7zJX  
 VerifyWindow(); _eg&j  
 UnInit(); $G D@e0  
 return CWinApp::ExitInstance(); y8/+kn +  
} g>;u} +lO  
bTJ l  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^M7pCetjdW  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) AB[#  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ -;W`0 k^  
#if _MSC_VER > 1000 bP HtP\)  
#pragma once Cy2)M(RW  
#endif // _MSC_VER > 1000 xt=ELzu$  
g$9EI\a  
class CCaptureDlg : public CDialog 1azj%WY  
{ Gcp!"y=i  
 // Construction zTb,h  
 public: `71(wf1q[f  
  BOOL bTray; k:* (..!0z  
  BOOL bRegistered; TV[@!E a  
  BOOL RegisterHotkey(); H?$gHZPI  
  UCHAR cKey; Fz1K*xx'  
  UCHAR cMask; o@@, }  
  void DeleteIcon(); Eq/oq\(/6  
  void AddIcon(); ^7,`6g  
  UINT nCount; {qbx iL-  
  void SaveBmp(); <)9dTOdd  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (^9dp[2  
  // Dialog Data +A%"_7L}  
  //{{AFX_DATA(CCaptureDlg) o8!uvl}:9  
  enum { IDD = IDD_CAPTURE_DIALOG }; o@ W:PmKW  
  CComboBox m_Key; T.GB *  
  BOOL m_bControl; 3.E3}Jz`  
  BOOL m_bAlt; 3}gf %U]L  
  BOOL m_bShift; &8M^E/#.^;  
  CString m_Path; r"_SL!,^  
  CString m_Number; (^mpb  
  //}}AFX_DATA 5rUDRFO6  
  // ClassWizard generated virtual function overrides `Yw:<w\4C  
  //{{AFX_VIRTUAL(CCaptureDlg) `ZZq Sc4  
 public: =+"=|cQ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); rJUXIV>z  
 protected: 84jA)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (hn;C>B  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); f,0,:)  
  //}}AFX_VIRTUAL ZxU3)`O  
  // Implementation XI7:y4M  
 protected: ' i<}/l  
  HICON m_hIcon; mz?1J4rt  
  // Generated message map functions &T2qi'  
  //{{AFX_MSG(CCaptureDlg) EU4j'1!&g<  
  virtual BOOL OnInitDialog(); O#3PUuE%d  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Wj"GS!5  
  afx_msg void OnPaint(); ObEp0-^?  
  afx_msg HCURSOR OnQueryDragIcon(); c(r8 F[4w  
  virtual void OnCancel(); zelM}/d  
  afx_msg void OnAbout(); _(0GAz%9  
  afx_msg void OnBrowse(); vuO~^N]G  
  afx_msg void OnChange(); ,Uu#41ZOKL  
 //}}AFX_MSG !7y:|k,ac  
 DECLARE_MESSAGE_MAP() Y7WU4He L  
}; z\r29IRh  
#endif Yu_` >so  
Kl]LnN%A{  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file a n,$Z,G#K  
#include "stdafx.h" _&}z+(Ug  
#include "Capture.h" I W5N^J  
#include "CaptureDlg.h" xY$@^(Q\  
#include <windowsx.h> w .+B h  
#pragma comment(lib,"hook.lib") |jJ9dTD8/  
#ifdef _DEBUG W $EAo+V  
#define new DEBUG_NEW JsV-:J  
#undef THIS_FILE H0?Vq8I?  
static char THIS_FILE[] = __FILE__; &7Lg) PG  
#endif BZ}_  
#define IDM_SHELL WM_USER+1 NW`L6wgl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +MvO+\/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;k5B@z/<S  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 0S$6j-"  
class CAboutDlg : public CDialog OoOr@5g  
{ U2kl-E:  
 public: N5|wBm>m  
  CAboutDlg(); -cL wjI  
  // Dialog Data L2{b~`UvP  
  //{{AFX_DATA(CAboutDlg) i f!   
  enum { IDD = IDD_ABOUTBOX }; @D7/u88|  
  //}}AFX_DATA :<i<\TH'  
  // ClassWizard generated virtual function overrides }CB9H$FkCY  
  //{{AFX_VIRTUAL(CAboutDlg) S7f"\[Aw  
 protected: uL9O_a;!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [6cf$FS9  
  //}}AFX_VIRTUAL jzAXC^FS  
  // Implementation eg(1kDMpn  
 protected: #s3R4@{  
  //{{AFX_MSG(CAboutDlg) JYO("f  
  //}}AFX_MSG akV-|v_  
  DECLARE_MESSAGE_MAP() [[' (,,r  
}; ]=?.LMjnH  
mWX{I2  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) qz&?zzz;  
{ &9Xn:<"`)  
 //{{AFX_DATA_INIT(CAboutDlg) !G~`5?CvE  
 //}}AFX_DATA_INIT Cm~z0c|T  
} 4'GosQ85  
~U<=SyZYo  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) WIYWql>*  
{ E4qQ  
 CDialog::DoDataExchange(pDX); S- JD}+ 9  
 //{{AFX_DATA_MAP(CAboutDlg) '-M9v3itC  
 //}}AFX_DATA_MAP &"mWi-Mpl  
}  re@;6o  
9Z lfY1=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $3yn-'o'A  
 //{{AFX_MSG_MAP(CAboutDlg) %{ +>\0x  
 // No message handlers )2: ,E  
 //}}AFX_MSG_MAP Da&Brm   
END_MESSAGE_MAP() 2"8qtG`Et  
uow{a*q d6  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _<6B.{$\7m  
: CDialog(CCaptureDlg::IDD, pParent) A!IZIT5)m  
{ y[d>7fcf  
 //{{AFX_DATA_INIT(CCaptureDlg) KkyZd9  
  m_bControl = FALSE; !T$h? o  
  m_bAlt = FALSE; gaU1A"S}  
  m_bShift = FALSE; ]qO*(m:}o  
  m_Path = _T("c:\\"); lnv&fu`1P  
  m_Number = _T("0 picture captured."); xyyEaB  
  nCount=0; buA/G-<e  
  bRegistered=FALSE; ?#Y1E~N  
  bTray=FALSE; JV@b(x`  
 //}}AFX_DATA_INIT Bnh*;J0  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (R-(  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); dlCmSCp%  
} qTI_'q  
|)+45e  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) A&L2&ofV&q  
{ UaXWHCm`  
 CDialog::DoDataExchange(pDX); \vF*n Z5/  
 //{{AFX_DATA_MAP(CCaptureDlg) aqKrf(Rv  
  DDX_Control(pDX, IDC_KEY, m_Key); m e2$ R>@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); #y*p7~|@  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Yk=2ld;;  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); .RN2os{  
  DDX_Text(pDX, IDC_PATH, m_Path); @|d+T"f  
  DDX_Text(pDX, IDC_NUMBER, m_Number); r;SOAucX  
 //}}AFX_DATA_MAP '.IR|~Y  
} Z=zD~ka  
~$]Puv1V>  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D),hSqJ"  
//{{AFX_MSG_MAP(CCaptureDlg) 7O<K?;I  
 ON_WM_SYSCOMMAND() g^[BnP)I  
 ON_WM_PAINT() _`+2e-  
 ON_WM_QUERYDRAGICON() A75z/O{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _NN5e|t  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) !a^'Jbb  
 ON_BN_CLICKED(ID_CHANGE, OnChange) /kNSB;  
//}}AFX_MSG_MAP Yge}P:d9  
END_MESSAGE_MAP() h]DzX8r}  
j6#Vwcr  
BOOL CCaptureDlg::OnInitDialog() 8]&\FA8  
{ _ pO1XM  
 CDialog::OnInitDialog(); Ug8>|wCE  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /TY=ig1z  
 ASSERT(IDM_ABOUTBOX < 0xF000); vBYk"a6SD  
 CMenu* pSysMenu = GetSystemMenu(FALSE); {9XQ~t"m^  
 if (pSysMenu != NULL) v%;Ny ab6$  
 { (x140_TH~  
  CString strAboutMenu; SY$%)(c8kL  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %OJq(}  
  if (!strAboutMenu.IsEmpty()) 5v"Sv  
  { Esdw^MGL2  
   pSysMenu->AppendMenu(MF_SEPARATOR); %nhE588xf  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); O:jaA3  
  } gb}>xO  
 } ,L-G-V+  
 SetIcon(m_hIcon, TRUE); // Set big icon GU7f27p  
 SetIcon(m_hIcon, FALSE); // Set small icon ca,U>'(y  
 m_Key.SetCurSel(0); S3gd'Bahq  
 RegisterHotkey(); cXbQ  
 CMenu* pMenu=GetSystemMenu(FALSE); z9JZV`dNgz  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _[,7DA.qc  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); li9>zjz  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND);  S)x5.vo^  
 return TRUE; // return TRUE unless you set the focus to a control :Hj #1-U  
} q@XxCP]  
iyP0;$  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) PH>`//D%n?  
{ Qq3UC%Z1  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) I\@`AU  
 { Zqj EVVB  
  CAboutDlg dlgAbout; /7igPNhx  
  dlgAbout.DoModal(); :I8HRkp  
 } A>%mJ3M  
 else \?"p]&2UcB  
 { qKk|2ecTB5  
  CDialog::OnSysCommand(nID, lParam); PGhYkj2  
 } lS/l iI'Y  
} ;TulRx]EA  
0N):8`dY  
void CCaptureDlg::OnPaint() Ao$|`Lgj=z  
{ (w-@b70E  
 if (IsIconic()) NE+ ;<mW  
 { z4 KKt&  
  CPaintDC dc(this); // device context for painting 30{WGc@l#  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); pMzlpmW;P  
  // Center icon in client rectangle Un Ocw  
  int cxIcon = GetSystemMetrics(SM_CXICON); gmN$}Gy}  
  int cyIcon = GetSystemMetrics(SM_CYICON); sF~!qag4q'  
  CRect rect; JzmX~|=Xi  
  GetClientRect(&rect); N1Dr'aw*  
  int x = (rect.Width() - cxIcon + 1) / 2; R})b%y`]  
  int y = (rect.Height() - cyIcon + 1) / 2; 3o`c`;H%p  
  // Draw the icon 1@xdzKua1  
  dc.DrawIcon(x, y, m_hIcon); zo:NE0 0  
 } o<Qt<*  
 else Zty9O8g  
 { 23/;W|   
  CDialog::OnPaint(); Ca ?d8  
 } FTWjIa/[  
} Kon|TeC>d  
<jG[ z69)  
HCURSOR CCaptureDlg::OnQueryDragIcon() ["sm7yQ  
{ ^wz 2e  
 return (HCURSOR) m_hIcon; 2k!4oVUN  
} @@H?w7y?&  
,&G !9}EC  
void CCaptureDlg::OnCancel() :H>0/^Mg0  
{ <KFl4A~  
 if(bTray) 2*a5pFkb  
  DeleteIcon(); Fil6;R  
  CDialog::OnCancel(); nhRpb9f`1@  
} Kiq[PK  
.p(%gmOp#  
void CCaptureDlg::OnAbout() ~8U0(n:^  
{ pyp0SGCM:  
 CAboutDlg dlg; CTJwZY7  
 dlg.DoModal(); ^/~C\ (  
} {_UOS8j7  
e*M-y C  
void CCaptureDlg::OnBrowse() ,O_iSohS  
{ r0q?e`nsA  
 CString str; OM81$Xo=  
 BROWSEINFO bi; 8~AL+*hn  
 char name[MAX_PATH]; e?+&2zMq  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y6m:d&p=}  
 bi.hwndOwner=GetSafeHwnd(); RO[6PlrRN  
 bi.pszDisplayName=name; j+("4b'  
 bi.lpszTitle="Select folder"; "6gBbm  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; p\DSFB  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); p#6tKY;N  
 if(idl==NULL) Hz j%G>  
  return; EkoT U#w5  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?X$*8;==6  
 str.ReleaseBuffer(); -|I_aOC@  
 m_Path=str; )j. .)o  
 if(str.GetAt(str.GetLength()-1)!='\\') \|CuTb;0  
  m_Path+="\\"; Mk}*ze0%  
 UpdateData(FALSE); +asO4'r  
} .$o A~  
tgY/8& $M  
void CCaptureDlg::SaveBmp() yw >Frb5p  
{ =3dd1n;8>  
 CDC dc; $E}N`B7  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); \LM.>vJ  
 CBitmap bm; p$mt&,p  
 int Width=GetSystemMetrics(SM_CXSCREEN); KPA.5,ai  
 int Height=GetSystemMetrics(SM_CYSCREEN); &Qq|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); U#|6n ,  
 CDC tdc; B7PdavO#  
 tdc.CreateCompatibleDC(&dc); "(Nt9K%P)  
 CBitmap*pOld=tdc.SelectObject(&bm); Fz' s\  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cp6I]#X  
 tdc.SelectObject(pOld); \- 8aTF  
 BITMAP btm; 5YYBX\MV  
 bm.GetBitmap(&btm); `%*`rtZ+H.  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; mDO! o  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Z9eP(ip  
 BITMAPINFOHEADER bih; E6zPN?\ <  
 bih.biBitCount=btm.bmBitsPixel; *Tr9pq%m  
 bih.biClrImportant=0; E] rBq_S  
 bih.biClrUsed=0; A Wd,qldv  
 bih.biCompression=0; nO#x "  
 bih.biHeight=btm.bmHeight; ?C']R(fQ\  
 bih.biPlanes=1; +[}<u--  
 bih.biSize=sizeof(BITMAPINFOHEADER); sgRWjrc/  
 bih.biSizeImage=size;  3Hi8=*  
 bih.biWidth=btm.bmWidth; 6FY.kN\  
 bih.biXPelsPerMeter=0; } L _Zmi$  
 bih.biYPelsPerMeter=0; \\;y W~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); L%+mD$@u  
 static int filecount=0; G&08Qb ,N  
 CString name; &@=W+A=c~  
 name.Format("pict%04d.bmp",filecount++); #7@p  
 name=m_Path+name; qG +PqK;  
 BITMAPFILEHEADER bfh; J~C=o(r  
 bfh.bfReserved1=bfh.bfReserved2=0; k 7:Z\RGy  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ,&L}^Up  
 bfh.bfSize=54+size; y9.?5#aL  
 bfh.bfOffBits=54; a'A<'(yv  
 CFile bf; W}#n.c4+  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ wF3 MzN=%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +.Xi7x+#O  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); d4p6.3  
  bf.WriteHuge(lpData,size); v-wZHkdd1  
  bf.Close(); _fSBb<  
  nCount++; j4u ["O3  
 } /EuH2cy$l  
 GlobalFreePtr(lpData); )S;3WnQ)  
 if(nCount==1) txE+A/>i9  
  m_Number.Format("%d picture captured.",nCount); #qW#>0U  
 else hVAatn[  
  m_Number.Format("%d pictures captured.",nCount); AH_qZTv0{Q  
  UpdateData(FALSE); Wb[k2V  
} ("{"8   
-hc8IS  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) U uC-R)  
{ VfUHqdg-  
 if(pMsg -> message == WM_KEYDOWN) $ Ggnn#  
 { z#1"0Ks&P  
  if(pMsg -> wParam == VK_ESCAPE) 20}w . V  
   return TRUE; sPXjU5uq#  
  if(pMsg -> wParam == VK_RETURN) *F!1xyg  
   return TRUE; ,RW`9+gx  
 } 4-I7"pW5  
 return CDialog::PreTranslateMessage(pMsg); Ubgn^+AI  
} _EJPI  
3_`)QYU'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .(3ec/i4CF  
{ 4c[/%e:\-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Y6Ux*vhK  
  SaveBmp(); vPc*x5w-  
  return FALSE; $HtGB]  
} q^?a|l  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Qqx!'fft  
 CMenu pop; Cy *.pzCi  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >|yP`m   
 CMenu*pMenu=pop.GetSubMenu(0); EiG5k.C@  
 pMenu->SetDefaultItem(ID_EXITICON); k1ja ([Q  
 CPoint pt; FBbaLqgVF{  
 GetCursorPos(&pt); ~Z!YB,)bp  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Hp>L}5 y[  
 if(id==ID_EXITICON) K:GEC-  
  DeleteIcon(); E@yo/S  
 else if(id==ID_EXIT) j=Izwt>   
  OnCancel(); tP"6H-)X&  
 return FALSE; /V63yzoY  
} MTKNIv|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); k>7bPR5Mw  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -*i_8`  
 AddIcon(); u0A$}r$L  
 return res; 2dcvB]T!  
} F-oe49p5e  
>\w]i*%  
void CCaptureDlg::AddIcon() vB}c6A4'U  
{ Ow.DBL)x'>  
 NOTIFYICONDATA data; r/HTkXs I  
 data.cbSize=sizeof(NOTIFYICONDATA); LrT EF j  
 CString tip; P|Gwt&  
 tip.LoadString(IDS_ICONTIP); U|VL+9#hd  
 data.hIcon=GetIcon(0); Dh}(B$~Oz+  
 data.hWnd=GetSafeHwnd(); ^;rjs|`K#  
 strcpy(data.szTip,tip); CWocb=E  
 data.uCallbackMessage=IDM_SHELL; vZ811U~}  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; :~#)Xa0I  
 data.uID=98; W]bgWKd  
 Shell_NotifyIcon(NIM_ADD,&data); 9[;da  
 ShowWindow(SW_HIDE); }WaZ+Mdg\  
 bTray=TRUE; ^i_+ugJX  
} W`NF40)  
<oV[[wl  
void CCaptureDlg::DeleteIcon() tfZ@4%'  
{ qw?(^uZNW  
 NOTIFYICONDATA data; Z)2d4:uv  
 data.cbSize=sizeof(NOTIFYICONDATA); ~LZrhwVj$  
 data.hWnd=GetSafeHwnd(); &$ "J\v m  
 data.uID=98; ^X}r ^  
 Shell_NotifyIcon(NIM_DELETE,&data); ^L)TfI_n  
 ShowWindow(SW_SHOW); T&+3Xi:  
 SetForegroundWindow(); b9m`y*My  
 ShowWindow(SW_SHOWNORMAL); GqR|hg  
 bTray=FALSE; sZT~ 5c8  
} 'Grii,  
ge:a{L  
void CCaptureDlg::OnChange() &)gc{(4$  
{ c)B3g.C4m  
 RegisterHotkey(); 6h2keyod  
} V7r_Ubg@K  
 WZY+c  
BOOL CCaptureDlg::RegisterHotkey() (RV#piM  
{ >}%#s`3W1_  
 UpdateData(); )#cZ& O  
 UCHAR mask=0; nq8XVT.m^\  
 UCHAR key=0; kfZ`|w@q  
 if(m_bControl) kLF`6ZXtd  
  mask|=4; [rWBVfm  
 if(m_bAlt) =gD)j&~}_  
  mask|=2; K) fKL   
 if(m_bShift) @j_o CDS  
  mask|=1; PfRA\  
  key=Key_Table[m_Key.GetCurSel()]; *1{A'`.=\  
 if(bRegistered){ v/9ZTd  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); HY FMf3  
  bRegistered=FALSE; e15yDwvB  
 } rDhQ3iCqo  
 cMask=mask; ?]$<Ufr  
 cKey=key; #dL,d6a  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); rKUtTj  
 return bRegistered; G<D8a2q  
} hTzj{}w  
!p!Qg1O6o  
  四、小结 l<GN<[/.+  
n:OXv}pv  
  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
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八