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
  • 5987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: +>:}req  
  7{^4 x#NO  
  一、实现方法 aMvK8C%7  
;IuK2iDt<  
  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: CxA\yG3L&  
7vpN 6YP  
#pragma data_seg("shareddata") -j`!(IJ  
HHOOK hHook =NULL; //钩子句柄 zRy5,,i5=[  
UINT nHookCount =0; //挂接的程序数目 Q P=[ Vw  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $JhZ'Z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Qyv'nx0=  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey n;kciTD%wK  
static int KeyCount =0; [Ql?Y$QB`4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 b4)*<Zp`  
#pragma data_seg() h lkvk]v  
|pH* CCA  
  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。 { 0%TMiVf  
~0F9x9V  
  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: a()6bRc~T  
BgkB x  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 9Z0CF~Y5  
cKey,UCHAR cMask) 9]L!.  
{ C9mzg  
 BOOL bAdded=FALSE; ;o)=XEh8P  
 for(int index=0;index<MAX_KEY;index++){ sUbz)BS#.  
  if(hCallWnd[index]==0){ :PD`PgQ  
   hCallWnd[index]=hWnd; (~7m"?  
   HotKey[index]=cKey; Z<N&UFw7QJ  
   HotKeyMask[index]=cMask; P~\a)Szy  
   bAdded=TRUE; WS1&3mOd  
   KeyCount++; >'ksXA4b  
   break; Wj4^W<IO  
  } !2Xr~u7a  
 } ;<kZfx  
 return bAdded; A3MZxu=':3  
} :otY;n-  
//删除热键 +f X}O9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H-_^TB  
{ GSGyF  
 BOOL bRemoved=FALSE; I mPu}  
 for(int index=0;index<MAX_KEY;index++){ [%7;f|p?  
  if(hCallWnd[index]==hWnd){ NMl ?Y uEv  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ K_AtU/  
    hCallWnd[index]=NULL; c?.r"5#  
    HotKey[index]=0; k=T-L  
    HotKeyMask[index]=0; ]g>m?\'n  
    bRemoved=TRUE; <+T\F;   
    KeyCount--; \)^,PA3  
    break; 0q[p{_t`  
   } N)y^</Ya  
  } {=bg5I0|a  
 } ]&C:>  
 return bRemoved; <78$]Z2we  
} Ha)3i{OM  
"Ju /[#VCJ  
k5 aa>6K  
  DLL中的钩子函数如下: R=vbUA  
O t *K+^I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ZDOF  
{ 0'yG1qG  
 BOOL bProcessed=FALSE; S,*{q(   
 if(HC_ACTION==nCode) 5\akI\  
 { r~$}G-g  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }osHA`x"2  
   switch(wParam) dThR)Z'=  
   {  Qp kKVLi  
    case VK_MENU: R`@8.]cpPy  
     MaskBits&=~ALTBIT; t} *l?$`  
     break; q_<*esZ,  
    case VK_CONTROL: yu`KzIU  
     MaskBits&=~CTRLBIT; gp~yt0AU  
     break; DKy >]Hca  
    case VK_SHIFT: ~\IF9!  
     MaskBits&=~SHIFTBIT; QKp+;$SE'  
     break; +cz"`T`X 2  
    default: //judge the key and send message 7tpAZ<{  
     break; Mx O W)$f  
   } Ws-6W!Ib%  
   for(int index=0;index<MAX_KEY;index++){ @Jb@L  
    if(hCallWnd[index]==NULL) 2BoFyL*  
     continue; bz, Da  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2{A;du%&  
    { 1MbY7!?PG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R'Kt=.s<  
     bProcessed=TRUE; N]1V1c$G*  
    } 1YOg1 n+k  
   } Gw ~{V  
  } dtB[m^$  
  else if((lParam&0xc000ffff)==1){ //有键按下 dT5J-70Fl  
   switch(wParam) On#;)35M  
   { e >L5.~i  
    case VK_MENU: z.eJEK  
     MaskBits|=ALTBIT; ]b4pI*:$I  
     break; Ik`O.Q.}  
    case VK_CONTROL: <8u>_o6  
     MaskBits|=CTRLBIT; o3Mf:;2cC  
     break; R%>jJ[4\[  
    case VK_SHIFT: b8rp8'M)  
     MaskBits|=SHIFTBIT; 8[8|*8xqs  
     break; oN *SRaAp  
    default: //judge the key and send message cC^W2\  
     break; 9@:BK;Fi  
   } v6wRME;JA  
   for(int index=0;index<MAX_KEY;index++){ _*O7l  
    if(hCallWnd[index]==NULL) 3p:=xL  
     continue; <+V-k|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?qju DD  
    { d{er |$E?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u?Fnln e4@  
     bProcessed=TRUE; Oo FgQEr@  
    } fuq( 2&^  
   } "6?lQw e  
  } iaY5JEV:CA  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 !Tv?%? 2l  
   for(int index=0;index<MAX_KEY;index++){ CPVzX%=  
    if(hCallWnd[index]==NULL) ZU=,f'bU  
     continue; :W~6F*A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) o^HNF+sm  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); I[}75:^Rt  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?q\FLb%"7  
   } %dEB/[  
  } 3\;v5D:  
 } YTQ5sFuGM  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); j]r XoV>  
} %1Yz'AiW[  
oFWt(r   
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: k/%#>  
59V#FWe-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `,+#!)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z;#%t.  
"[k1D_PZ  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: lK0s=4c{  
d:A}CBTSY  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) WrNLGkt  
{ J0=7'@(p  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) UcgG  
 { Odm#wL~E  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 IE2CRBfs  
  SaveBmp(); YQ; cJ$  
  return FALSE; N1%p"(  
 } bG "H D?A_  
 …… //其它处理及默认处理 " jT#bIm  
} 1@xP(XS  
S@x}QQ|.  
UEzsDJu  
  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。 C;9t">prk  
R,%_deV\(  
  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。 uKv&7p@|_)  
hi!`9k  
  二、编程步骤 %dc3z"u  
.;9jdGBf  
  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"; GD!- qH  
e9&+vsRmA  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 62Mdm3  
</= CZy5w  
  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; +IrZ ;&oy  
6O pa{]  
  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; wxE?3%.j\  
{(4# )K2g%  
  5、 添加代码,编译运行程序。 PY?8 [A+  
3)3Hck  
三、程序代码 6JhMkB^h  
@D)Z{=>{=5  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL pV7N byb4  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {Bh("wg$Lk  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ )>\4ULR83  
#if _MSC_VER > 1000 !DPF7x(-{  
#pragma once |m)kN2w  
#endif // _MSC_VER > 1000 K/^ +eoW(  
#ifndef __AFXWIN_H__ t0q_>T-kt  
#error include 'stdafx.h' before including this file for PCH OiF{3ae(  
#endif iwU[6A  
#include "resource.h" // main symbols `?"6l5d.]  
class CHookApp : public CWinApp ;FU|7L$H  
{ }k7_'p&yk  
 public: YGp)Oy}:  
  CHookApp(); /;Yy@oc  
  // Overrides 'f+NW &   
  // ClassWizard generated virtual function overrides dy2rkV.z  
  //{{AFX_VIRTUAL(CHookApp) NgVR,G|1  
 public: R(G\wqHUT3  
  virtual BOOL InitInstance(); v8m`jxII64  
  virtual int ExitInstance(); ?sXG17~Bm  
  //}}AFX_VIRTUAL iCP~O  
  //{{AFX_MSG(CHookApp) Pz%~ST  
  // NOTE - the ClassWizard will add and remove member functions here. a[sKE?  
  // DO NOT EDIT what you see in these blocks of generated code ! 9cG<hX9`F  
  //}}AFX_MSG ^]>aHz9  
  DECLARE_MESSAGE_MAP() %D`o  
}; !77NG4B  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); )MSZ2)(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @E%DP9.I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H=p`T+  
BOOL InitHotkey(); -R0/o7  
BOOL UnInit(); "UG K8x  
#endif &J$##B  
(u&`Ij9  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. OX\$nQ\o  
#include "stdafx.h" T_LLJ}6M  
#include "hook.h" $'{=R 45Z  
#include <windowsx.h> 71"+<C .  
#ifdef _DEBUG ]a?bzOr,  
#define new DEBUG_NEW $shp(T,q  
#undef THIS_FILE X:EEPGE  
static char THIS_FILE[] = __FILE__; 7C7>y/uS  
#endif 7O)" `  
#define MAX_KEY 100 #H~_K}Ks  
#define CTRLBIT 0x04 \S ."?!U  
#define ALTBIT 0x02 booRrTS  
#define SHIFTBIT 0x01 .TpsJXF  
#pragma data_seg("shareddata") M:n6BC>t"  
HHOOK hHook =NULL; ~Y7dH Dn  
UINT nHookCount =0; =sgdkAYwP  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 2'|8Q\,:4Z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT QA?oJ_}y  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey fDh] tua  
static int KeyCount =0; .tnkT;T  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ;a r><w  
#pragma data_seg() Elb aFbr  
HINSTANCE hins; %w ) +V  
void VerifyWindow(); O=}g 4c  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) XRtD< jlA"  
//{{AFX_MSG_MAP(CHookApp) 'wQv3 ;  
// NOTE - the ClassWizard will add and remove mapping macros here. Fky?\ec  
// DO NOT EDIT what you see in these blocks of generated code! D-&a n@  
//}}AFX_MSG_MAP ]s_8A`vm  
END_MESSAGE_MAP() 2S ~R!   
ZVih=Y-w  
CHookApp::CHookApp() !<<AzLVL  
{ Q.Aa{d9e  
 // TODO: add construction code here, Kz?#C  
 // Place all significant initialization in InitInstance s{}]D{bc  
} @Jn!0Y1_3  
7TX2&kMoc  
CHookApp theApp; xZ.!d.rn  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Bp?  
{ &7>zURv  
 BOOL bProcessed=FALSE; 56}X/u  
 if(HC_ACTION==nCode) h8{(KRa6  
 { 33Az$GXFsq  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2C=Q8ayvX  
   switch(wParam) @'6"7g  
   { /=:j9FF  
    case VK_MENU: C! 9}  
     MaskBits&=~ALTBIT; WsGths+[  
     break; li oc`C:  
    case VK_CONTROL: Dw6fmyJ:  
     MaskBits&=~CTRLBIT; b:W-l?  
     break; E4z)Mr#  
    case VK_SHIFT: (?0`d  
     MaskBits&=~SHIFTBIT; bHE2,;o  
     break; r! %;R?c  
    default: //judge the key and send message |nUl\WRd\  
     break; 78 f$6J q  
   } q v*7K@  
   for(int index=0;index<MAX_KEY;index++){ @N@F,~[RR2  
    if(hCallWnd[index]==NULL) ==N{1gO]  
     continue; HD>q(cK_|8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bulS&dAX  
    { xc @Ss[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =qy@Wvj$  
     bProcessed=TRUE; .a'f|c6  
    } ~f\G68c  
   } (p#0)C  
  } D{8PQ2x>  
  else if((lParam&0xc000ffff)==1){ //Key down 8' DW#%  
   switch(wParam) [iP#VM-N  
   { Of,2Q#oji  
    case VK_MENU: aB~S?.l  
     MaskBits|=ALTBIT; C1kYl0 zR[  
     break; ]=pR  
    case VK_CONTROL: /YAJbr  
     MaskBits|=CTRLBIT; +0Q,vK#j^  
     break; Fh$slow4!  
    case VK_SHIFT: Lh.b 5Q|  
     MaskBits|=SHIFTBIT; M5357Q  
     break; NPa\Cg[  
    default: //judge the key and send message co8"sz0(U  
     break; SRIA*M.B}  
   } ypOLp SYk  
   for(int index=0;index<MAX_KEY;index++) kYzKU2T\W  
   { >Gml4vGK  
    if(hCallWnd[index]==NULL) (V`Md\NL`  
     continue; i%m"@7.kk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W,5Hx1z R  
    { W !w,f;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); XRx+Dddt;  
     bProcessed=TRUE; \_V-A f{6  
    } / P|fB]p  
   } dO> VwP  
  } q[q?hQ/b  
  if(!bProcessed){ B%CTOi  
   for(int index=0;index<MAX_KEY;index++){ }je,")#W  
    if(hCallWnd[index]==NULL) S-Y=-"  
     continue; ~}EMk3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \wcam`f  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .IBp\7W!?E  
   } 'rp }G&m  
  } ^&@w$  
 } >@xrs  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); EP'h@zdz  
} @hQlrq5c  
l/TjQ*  
BOOL InitHotkey() ,2Q o7(A  
{ W&* f#E  
 if(hHook!=NULL){ MTg:dR_  
  nHookCount++; c #-U%qZ  
  return TRUE; M>9-=$7  
 } tz4 ]qOH8  
 else ^z1&8k"[^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); BS Iy+  
  if(hHook!=NULL) %,Sf1fUJ  
   nHookCount++; F:@70(<w%  
  return (hHook!=NULL); [FA{x?v kf  
} *4+3ObA  
BOOL UnInit() Vtc36-\1*  
{ %VYAd)gC  
 if(nHookCount>1){ x-OA([;/  
  nHookCount--; poGc a1  
  return TRUE; !tfb*@{;'  
 } ;c~cet4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); S#)Eom?V  
 if(unhooked==TRUE){ @k[R/,#'[t  
  nHookCount=0; F <>!kK/c  
  hHook=NULL; EVp,Q"V]  
 } 3bk|<7tl  
 return unhooked; B`*ZsS=R-  
} 5;0g!&-t#  
5^']+5_vb  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *.L81er5~  
{ eSWL rryY  
 BOOL bAdded=FALSE; /|#&px)G  
 for(int index=0;index<MAX_KEY;index++){ w0w G-R ?  
  if(hCallWnd[index]==0){ G'3qzBJ#  
   hCallWnd[index]=hWnd; G9g1hie@%  
   HotKey[index]=cKey; O"Ku1t!  
   HotKeyMask[index]=cMask; O+g3X5f+  
   bAdded=TRUE; * #jsgj[  
   KeyCount++; | N0Z-|  
   break; q0f3="  
  } L}@c6fHG  
 } :RoBl3X=  
 return bAdded; y_\p=0t8  
} }*.0N;;C  
*K> l*l(f]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) xX*H7#  
{ wP[t0/dl  
 BOOL bRemoved=FALSE; !vG'J\*xc  
 for(int index=0;index<MAX_KEY;index++){ WVVJ  
  if(hCallWnd[index]==hWnd){ 'cY` w  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Y3Vlp/"rB"  
    hCallWnd[index]=NULL; $)3%U?AP  
    HotKey[index]=0; XsnF~)YW  
    HotKeyMask[index]=0; /pF `8$  
    bRemoved=TRUE; :0s]U_h  
    KeyCount--; x|yEt O&  
    break; c478P=g=5  
   } Yjx|9_|Xn  
  } >3z5ww  
 } &u#&@J  
 return bRemoved; pdE3r$C  
} ?LvCR_D:  
zZVfj:i8  
void VerifyWindow() xg)v0y~  
{ E<yW\  
 for(int i=0;i<MAX_KEY;i++){ p.LFVFPT  
  if(hCallWnd!=NULL){ v\p;SwI   
   if(!IsWindow(hCallWnd)){ \&H nKhI  
    hCallWnd=NULL; M5xCC!  
    HotKey=0; 2W4qBaG$=  
    HotKeyMask=0; JV;OGh>  
    KeyCount--; ]T%rjsN  
   } 6Cn+e.j@  
  } 5nsq[Q`  
 } ]Dw]p! @  
} 6/rFHY2q  
[B+W%g(c-  
BOOL CHookApp::InitInstance() mEG#>Gg$  
{ zbq@pj)Qu  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6R=W}q4  
 hins=AfxGetInstanceHandle(); 27;ci:5  
 InitHotkey(); J~#;<e{\"  
 return CWinApp::InitInstance(); D1__n6g[  
} w8n|B?Sr  
)B[0JrcE  
int CHookApp::ExitInstance() HD(.BW7  
{ ;[fw]P n  
 VerifyWindow(); s`0QA!G{-  
 UnInit(); rF]h$Z8o  
 return CWinApp::ExitInstance(); qh`t-  
} XLH0 ;+CL{  
{GC?SaK  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file F7Zwh5W  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) TY1I=8  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ O BN2 ) j  
#if _MSC_VER > 1000 {)-aSywe  
#pragma once 3-&QRR#p  
#endif // _MSC_VER > 1000 0}b tXh  
|+T1XYG5  
class CCaptureDlg : public CDialog ztw@Y|<2  
{ V O3x~E  
 // Construction 8QM(?A  
 public: '0FhL)x?"T  
  BOOL bTray; t+eVR8  
  BOOL bRegistered; l8?>>.<P=  
  BOOL RegisterHotkey(); ~JaAii{  
  UCHAR cKey; %Ah^E$&n2  
  UCHAR cMask; y3h/ IpT  
  void DeleteIcon(); -{ H0g]  
  void AddIcon(); ;UxP Kpl  
  UINT nCount; VY3&  
  void SaveBmp(); wu)w   
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~J P=T  
  // Dialog Data 1R,:  
  //{{AFX_DATA(CCaptureDlg) l(02W  
  enum { IDD = IDD_CAPTURE_DIALOG }; hRCed4qA  
  CComboBox m_Key; m%76i;uP  
  BOOL m_bControl; ~8]NK&J  
  BOOL m_bAlt; dxmE3*b`  
  BOOL m_bShift; YxP&7oq  
  CString m_Path; 7(5 4/  
  CString m_Number; q}]XYys  
  //}}AFX_DATA 62Z#Y Q}x  
  // ClassWizard generated virtual function overrides [Nk3|u`h  
  //{{AFX_VIRTUAL(CCaptureDlg) )Q .>rX,F  
 public: +t?3T-@Ks  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -YCOP0  
 protected: 7R`mf   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v61[.oS  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ia MUsa{  
  //}}AFX_VIRTUAL <"_d]?,  
  // Implementation /K(o]J0F  
 protected: THS.GvT9[  
  HICON m_hIcon; |cR;{Z8?_  
  // Generated message map functions GSRVe/ [  
  //{{AFX_MSG(CCaptureDlg) QDhOhGK  
  virtual BOOL OnInitDialog(); JhLgCnm  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); AT%u%cE-  
  afx_msg void OnPaint(); 07[_.i.l  
  afx_msg HCURSOR OnQueryDragIcon(); o}$ EG  
  virtual void OnCancel(); 2* 2wY=  
  afx_msg void OnAbout(); }yz (xH  
  afx_msg void OnBrowse(); *3?'4"B{8  
  afx_msg void OnChange(); Dp':oJC  
 //}}AFX_MSG 2n|K5FR()  
 DECLARE_MESSAGE_MAP() 3J5!oF{H  
}; 'JRvP!]  
#endif `tn{ei  
>Vwc3d  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file hK_LEwd;  
#include "stdafx.h" <?@NRFTe  
#include "Capture.h" 3h *!V6%q  
#include "CaptureDlg.h" F 9@h|#an  
#include <windowsx.h> sn)3Z A  
#pragma comment(lib,"hook.lib") 6=fSE=]DY  
#ifdef _DEBUG {$wjO7Glp  
#define new DEBUG_NEW D`$hPYK|_  
#undef THIS_FILE c|#8T*`C  
static char THIS_FILE[] = __FILE__; eY|  
#endif lQe%Yh >rl  
#define IDM_SHELL WM_USER+1 sL\L"rQN6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lhBT@5Dm9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pNKhc#-w  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #n#@fAY  
class CAboutDlg : public CDialog /|D*w^ >  
{ Ym =FgM\  
 public: , T8>}U(  
  CAboutDlg(); 6e[VgN-s  
  // Dialog Data lw< c2 C  
  //{{AFX_DATA(CAboutDlg) [@5Ytv H  
  enum { IDD = IDD_ABOUTBOX }; ;<(W% _  
  //}}AFX_DATA sk=-M8;\  
  // ClassWizard generated virtual function overrides |v$JCU3!A  
  //{{AFX_VIRTUAL(CAboutDlg) H kQ) n3  
 protected: TL}++e 7+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (G[ *|6m  
  //}}AFX_VIRTUAL TZY3tUx0|G  
  // Implementation <OIIoB?t  
 protected: %'X[^W  
  //{{AFX_MSG(CAboutDlg) D"a~ #^  
  //}}AFX_MSG |v({-*7  
  DECLARE_MESSAGE_MAP() /!3@]xz*  
}; L2[f]J%  
%@6}GmK^  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) jW  3c"  
{ N19({0+i2  
 //{{AFX_DATA_INIT(CAboutDlg) <y?r!l=Am  
 //}}AFX_DATA_INIT /\4'ddGU  
} C,v(:ZE$J7  
vy\RcP  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) &M.66O@  
{ D F*:_B )  
 CDialog::DoDataExchange(pDX); ,f[>L|?e  
 //{{AFX_DATA_MAP(CAboutDlg) Z )SY.iK.  
 //}}AFX_DATA_MAP +Zaj,oEE  
} `1bv@yzq  
!Rhl f.x  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) i}B2R$Z3  
 //{{AFX_MSG_MAP(CAboutDlg) >kW@~WDMu  
 // No message handlers oz}+T(@O  
 //}}AFX_MSG_MAP 9f<MQ6_UU  
END_MESSAGE_MAP() }<9cL'  
TzNn^ir=HX  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $3s@}vLd  
: CDialog(CCaptureDlg::IDD, pParent) '*"vkgN  
{ "gDb1h)8  
 //{{AFX_DATA_INIT(CCaptureDlg) =*r]) Vg^  
  m_bControl = FALSE; CnG+Mc^  
  m_bAlt = FALSE; RsY3V=u  
  m_bShift = FALSE; 'qOREN  
  m_Path = _T("c:\\"); }x07^4$j  
  m_Number = _T("0 picture captured."); ! q M=a3  
  nCount=0; @tZ&2RY1  
  bRegistered=FALSE; @Bf%s(Uj+  
  bTray=FALSE; `Ch9~*p  
 //}}AFX_DATA_INIT Q+W1lv8R  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 SV~cJ]F  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); q)^Jj ?W  
} A m>cd;  
Fd[zDz  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4}eepJOn  
{ qa0 yg8,<  
 CDialog::DoDataExchange(pDX); mjKS{  
 //{{AFX_DATA_MAP(CCaptureDlg) Yd#/1!A7u  
  DDX_Control(pDX, IDC_KEY, m_Key); {l/-LZ.  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); hHT_V2*  
  DDX_Check(pDX, IDC_ALT, m_bAlt); z$?~Y(EY  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \xnWciQ#{  
  DDX_Text(pDX, IDC_PATH, m_Path); $**r(HV  
  DDX_Text(pDX, IDC_NUMBER, m_Number); L 8dc(Z%v  
 //}}AFX_DATA_MAP -6n K<e`  
} ,I%g|'2  
+i@y@<l:+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) <c qbUL  
//{{AFX_MSG_MAP(CCaptureDlg) A*}.EClH  
 ON_WM_SYSCOMMAND() Dk(1}%0U/  
 ON_WM_PAINT() \kU &^Hi  
 ON_WM_QUERYDRAGICON() s#)5h0t#du  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) <7j87  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) {6_|/KE9_  
 ON_BN_CLICKED(ID_CHANGE, OnChange) --|Wh^i>?  
//}}AFX_MSG_MAP WYEKf9}  
END_MESSAGE_MAP() k6sI L3QJ0  
3G`aHTWk  
BOOL CCaptureDlg::OnInitDialog() z6w3"9Um  
{ ).sRv6/c  
 CDialog::OnInitDialog(); a{qM2P(S  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =A!@6Nw  
 ASSERT(IDM_ABOUTBOX < 0xF000); .`4{9?bR  
 CMenu* pSysMenu = GetSystemMenu(FALSE); g!+| I  
 if (pSysMenu != NULL) bqnNLs<N  
 { "hzB9*"t  
  CString strAboutMenu; /#VhkC _  
  strAboutMenu.LoadString(IDS_ABOUTBOX); t\%HX.8[;%  
  if (!strAboutMenu.IsEmpty()) ~1W x =  
  { }}>q2y  
   pSysMenu->AppendMenu(MF_SEPARATOR); 32/MkuY^u  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); DW_1,:,?7l  
  } K%F,='P}  
 } $0lD>yu  
 SetIcon(m_hIcon, TRUE); // Set big icon MBhWMCN2  
 SetIcon(m_hIcon, FALSE); // Set small icon BE_ay-  
 m_Key.SetCurSel(0); OVhE??#  
 RegisterHotkey(); 9/ibWa\.  
 CMenu* pMenu=GetSystemMenu(FALSE); r?Wk<>%>  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .xH5fMj,"  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /iJ4{p   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); c%'RR?Tl  
 return TRUE; // return TRUE unless you set the focus to a control %|oJ>+  
} JQ6zVS2SSS  
) `A3M)  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :=/>Vbd: )  
{ T QSzx%i2  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) [ji#U s:h  
 { b{]z w pf  
  CAboutDlg dlgAbout; LS88.w\=S@  
  dlgAbout.DoModal(); Zy(W^~NT  
 } fv9V7  
 else Te}8!_ohyC  
 { fDvl/|62{  
  CDialog::OnSysCommand(nID, lParam); EodQ*{l  
 } '{ V0M<O  
} ?Vf o+a,  
N =QfP  
void CCaptureDlg::OnPaint() Y! gCMLL  
{ glF; e T  
 if (IsIconic()) 8F&=a,ps[  
 { qIIv6''5@  
  CPaintDC dc(this); // device context for painting h?8]C#6^  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); }9W4"e2)  
  // Center icon in client rectangle ?l^1 *Q,  
  int cxIcon = GetSystemMetrics(SM_CXICON); zN"J}r:  
  int cyIcon = GetSystemMetrics(SM_CYICON); P)MDPI+~  
  CRect rect; (KF=On;=Y  
  GetClientRect(&rect); Bb}fj28  
  int x = (rect.Width() - cxIcon + 1) / 2; A3iFI9Iv  
  int y = (rect.Height() - cyIcon + 1) / 2; }`,t$NV`  
  // Draw the icon h?;T7|^  
  dc.DrawIcon(x, y, m_hIcon); TG+VEL |T  
 } Nd cg/d  
 else :X]itTrGs  
 { kMt 8/E`  
  CDialog::OnPaint(); bj"J'  
 } :kf`?u  
} `R=HKtr?  
|]ZYa.+:  
HCURSOR CCaptureDlg::OnQueryDragIcon() =MLcm^b  
{ OC<5E121>Y  
 return (HCURSOR) m_hIcon; .P MZX%*v  
} J1:1B ,^y  
1PP $XJtyD  
void CCaptureDlg::OnCancel() ~ ArP9 K "  
{ dRaNzK)M  
 if(bTray) 4y'OMRy  
  DeleteIcon(); Wv/%^3  
  CDialog::OnCancel(); ( m:Zk$  
} i2&ed_h<?  
Lg*B>=  
void CCaptureDlg::OnAbout() CS=qj-(  
{ X6mqi;+  
 CAboutDlg dlg; qQsku;C?i  
 dlg.DoModal(); Ts ^"xlK  
} P}TI q#  
fmiz,$O4?  
void CCaptureDlg::OnBrowse() x>*Drm 7  
{ v!ujj5-$I  
 CString str; yzLpK;  
 BROWSEINFO bi; JMz;BAHT  
 char name[MAX_PATH]; 7e#?e+5+A  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); yA.4G_|I  
 bi.hwndOwner=GetSafeHwnd(); T|dY 2  
 bi.pszDisplayName=name; - qy6Un+  
 bi.lpszTitle="Select folder"; c(n&A~*AJ%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; isZAoYVu  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); v(-{=*':  
 if(idl==NULL) J~1r{5V4{  
  return; =UJ:tSr  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (v}>tb*#`  
 str.ReleaseBuffer(); .D: Z{|.1  
 m_Path=str; Z<SLc,]^  
 if(str.GetAt(str.GetLength()-1)!='\\') JA'h4AXk  
  m_Path+="\\"; %JHGiCv|  
 UpdateData(FALSE); R%qGPO5Z\c  
} d\61; C  
},>pDeX^P  
void CCaptureDlg::SaveBmp() Qkd<sxL  
{ qLT>Mz)$ %  
 CDC dc; 3`ELKq  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); MF'$~gxo  
 CBitmap bm; t $xY #:  
 int Width=GetSystemMetrics(SM_CXSCREEN); v%s`~~u%^  
 int Height=GetSystemMetrics(SM_CYSCREEN); (''M{n  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ~YRDyQ:%T  
 CDC tdc; Mc%Nf$XQ  
 tdc.CreateCompatibleDC(&dc); UF<uU-C"  
 CBitmap*pOld=tdc.SelectObject(&bm); fe_yqIdk  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $n+w$CI)  
 tdc.SelectObject(pOld); ;ml)l~~YU  
 BITMAP btm; ;r>snJ=M  
 bm.GetBitmap(&btm); +tk{"s^r*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; .$%Soyr?,  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); IuOgxm~Y  
 BITMAPINFOHEADER bih; bLQ ^fH4ww  
 bih.biBitCount=btm.bmBitsPixel; I*IhwJFl/  
 bih.biClrImportant=0; 7_mw%|m6@  
 bih.biClrUsed=0; =R Ah|e  
 bih.biCompression=0; ALNc'MW!  
 bih.biHeight=btm.bmHeight; -Gw$#!  
 bih.biPlanes=1; j|/]#@Yr  
 bih.biSize=sizeof(BITMAPINFOHEADER); Okm{Xx  
 bih.biSizeImage=size; C_n9T{k  
 bih.biWidth=btm.bmWidth; 2;^y4ssg  
 bih.biXPelsPerMeter=0; %9M~f*  
 bih.biYPelsPerMeter=0; 0LfU=X0#7  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &znQ;NH#  
 static int filecount=0; KA){''>8  
 CString name; & M~`:R  
 name.Format("pict%04d.bmp",filecount++); LF~*^n>  
 name=m_Path+name; Ircp``g  
 BITMAPFILEHEADER bfh; 9f',7i  
 bfh.bfReserved1=bfh.bfReserved2=0; ZP;j9 T!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _=NwQu\_F  
 bfh.bfSize=54+size; }p!HT6 tZ  
 bfh.bfOffBits=54; /u0' 6V  
 CFile bf; 5fm?Lxr&?  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ kIGbG;"_  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9P~\Mpk  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +H9>A0JF  
  bf.WriteHuge(lpData,size); "ajjJ"x A  
  bf.Close(); pDh{Z g6t  
  nCount++; -|Y(V5]  
 } B:e @0049  
 GlobalFreePtr(lpData); #ceaZn|@m  
 if(nCount==1) xZQg'IT  
  m_Number.Format("%d picture captured.",nCount); 9$Xu,y  
 else 2Ri{bWi  
  m_Number.Format("%d pictures captured.",nCount); /}PF\j9#4  
  UpdateData(FALSE); @*qz(h]\  
} C":o/;,1  
'^Ql]% _  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ` bdZ/*E  
{ .hba*dV  
 if(pMsg -> message == WM_KEYDOWN) z%e8K(  
 { K,w"_T  
  if(pMsg -> wParam == VK_ESCAPE) ;w%*M}`5  
   return TRUE; 1xbK'i:-S  
  if(pMsg -> wParam == VK_RETURN) e][B7wZ  
   return TRUE; /,X[k !  
 } *3&fqBg  
 return CDialog::PreTranslateMessage(pMsg); Ty<L8+B|  
} AN24Sf'`  
K)-m*#H&uw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xw3YK!$sIF  
{ 6X\ 2GC9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =Apxdnz,  
  SaveBmp(); 66'?&Xx'  
  return FALSE; x,otFp  
} g=2Rqi5  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ g*F'[Z."  
 CMenu pop; /-qxS <?o  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); jWY$5Vq<H  
 CMenu*pMenu=pop.GetSubMenu(0); ?APe R,"V  
 pMenu->SetDefaultItem(ID_EXITICON); 13+<Q \  
 CPoint pt; `"@g8PWe  
 GetCursorPos(&pt); }Y*VAnY6;  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); u_ '!_T L  
 if(id==ID_EXITICON) OI?K/rn  
  DeleteIcon(); ph_4q@  
 else if(id==ID_EXIT) 7yz4'L  
  OnCancel(); Vm df8[5  
 return FALSE; n':!,a[  
} "d$m@c  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); sk 2-5S  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) IhBp%^H0-  
 AddIcon(); N*`b%XGn3  
 return res; +Ag!?T  
} !Mu|mz=  
\|Ul]1pO8  
void CCaptureDlg::AddIcon() PmR~c,  
{ \T\b NbPn  
 NOTIFYICONDATA data; 2{Chu85   
 data.cbSize=sizeof(NOTIFYICONDATA); IZm(`b;t^  
 CString tip; (lGaPMEU}  
 tip.LoadString(IDS_ICONTIP); N,f4*PQ  
 data.hIcon=GetIcon(0); !p[9{U->o;  
 data.hWnd=GetSafeHwnd(); g(Io/hyj  
 strcpy(data.szTip,tip); #!$GH_  
 data.uCallbackMessage=IDM_SHELL; =Me5ft w  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; sj8~?O  
 data.uID=98; PI~1GyJr@;  
 Shell_NotifyIcon(NIM_ADD,&data); [b/k3&O'  
 ShowWindow(SW_HIDE); tBm_YP[  
 bTray=TRUE; i:cXwQG}B  
} v NeCpf  
.!6>oL/iF  
void CCaptureDlg::DeleteIcon() tU^kQR!  
{ \y88d4zX  
 NOTIFYICONDATA data; a3VM '  
 data.cbSize=sizeof(NOTIFYICONDATA); 8NU`^L:1  
 data.hWnd=GetSafeHwnd(); $rhgzpZ!X_  
 data.uID=98; uu/+.9  
 Shell_NotifyIcon(NIM_DELETE,&data); d @*GUmJ  
 ShowWindow(SW_SHOW); [F*4EGB  
 SetForegroundWindow(); O4g+D#Lu  
 ShowWindow(SW_SHOWNORMAL); s (0*  
 bTray=FALSE; xy<`#  
} 90# ;?#  
I"t(%2*q  
void CCaptureDlg::OnChange() v @O&t4  
{ 3G meD/6  
 RegisterHotkey(); % ',F  
} +,&O1ykY  
)$&dg2[  
BOOL CCaptureDlg::RegisterHotkey() if)Y9:{r^  
{ SR8qt z/V  
 UpdateData(); #k$)i[aI-  
 UCHAR mask=0; 1N\D5g3  
 UCHAR key=0; c=;:R0_'t  
 if(m_bControl) N,J9Wu ZJ\  
  mask|=4; =B];?%  
 if(m_bAlt) 1Fe^Qb5G  
  mask|=2; (Si=m;g  
 if(m_bShift) p:OPw D+  
  mask|=1; 2qHf'  
  key=Key_Table[m_Key.GetCurSel()]; jV/CQM5a+  
 if(bRegistered){ >;#=gM  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \NG C$p n  
  bRegistered=FALSE; Jj= ;  
 } WA$>pG5s  
 cMask=mask; `Rd m-[&  
 cKey=key; CAU0)=M  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); oR~e#<$;  
 return bRegistered; 97,rE$bC  
} Ox#Q2W@Uy  
yfDAk46->6  
  四、小结 #-"VS-.<  
Z/6qG0feJ  
  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
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八