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
  • 6202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: o{Ep/O`  
  vVf!XZF  
  一、实现方法 d!X?R}  
5(|ud)v  
  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: HWU{521  
ZT8j9zs  
#pragma data_seg("shareddata") Oxvw`a#  
HHOOK hHook =NULL; //钩子句柄 68>zO %  
UINT nHookCount =0; //挂接的程序数目 ?d0Dfqh_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 :)yM9^<D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^KF'/9S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey CyU>S}t  
static int KeyCount =0; v;8XRR:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 lpM{@JC  
#pragma data_seg() UmuFzw^  
fh 3 6  
  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。 $3Ia+O   
m{yON&y  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: syfR5wc  
Bx)&MYY}[[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 4%7*tVG  
cKey,UCHAR cMask) -XyuA:pxx  
{ H}~^,B2;  
 BOOL bAdded=FALSE; .KSGma6]  
 for(int index=0;index<MAX_KEY;index++){ ?!66yn  
  if(hCallWnd[index]==0){ ou-;k }  
   hCallWnd[index]=hWnd; /W>"G1)  
   HotKey[index]=cKey; Dw[Q,SE   
   HotKeyMask[index]=cMask; Uwk|M?94  
   bAdded=TRUE; 0A9cu,ZdUR  
   KeyCount++; ~e8n yB  
   break; /km3L7L%R  
  } *X-$* ~J0  
 } `QF|> N  
 return bAdded; gD\}CxtG  
} e- CW4x  
//删除热键 zE/(F;> FV  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J"MJVMo$T  
{ yB1>83!q  
 BOOL bRemoved=FALSE; u2Obb`p S  
 for(int index=0;index<MAX_KEY;index++){ ?rDwYG(u]@  
  if(hCallWnd[index]==hWnd){ qh 3f  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ xL"% 2nf  
    hCallWnd[index]=NULL; "LWuN>   
    HotKey[index]=0; dp70sA!JF  
    HotKeyMask[index]=0; }+J@;:  
    bRemoved=TRUE; k#&SWp=  
    KeyCount--; .#J3UZ  
    break; co80M;4  
   } YLo$n  
  } M[{:o/]<  
 } Y5CE#&  
 return bRemoved; '1 $({{R  
} J;`~ !g  
A{%;Hd`0/  
-`UlntEdZ:  
  DLL中的钩子函数如下: [  _$$P*  
>xKRU5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) U'G`Q0n  
{ h)vTu%J:  
 BOOL bProcessed=FALSE; xn8B|axB  
 if(HC_ACTION==nCode) LH;G :  
 { 8|GpfW3p 2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 W V U9NmvE  
   switch(wParam) 1n"X?K5;A  
   {  &L]*]Xz;  
    case VK_MENU: 7p$*/5fk  
     MaskBits&=~ALTBIT; #O+]ydvT  
     break; #^ #i]{g  
    case VK_CONTROL: Z B&Uhi  
     MaskBits&=~CTRLBIT; Rp*t"HSaAW  
     break; ~2431<YV  
    case VK_SHIFT: PEIr-qs%D  
     MaskBits&=~SHIFTBIT; BkfBFUDQ  
     break; !e `=UZe1  
    default: //judge the key and send message <GRf%zJ  
     break; j.}V~Sp*  
   } Nk4_!  
   for(int index=0;index<MAX_KEY;index++){ UD`Z;F  
    if(hCallWnd[index]==NULL) Kj 8 W  
     continue; f:5/y^M&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5#\p>}[HG  
    { E 5{)d~q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); z]AS@}wWqg  
     bProcessed=TRUE; X)OP316yx  
    } VH6|(=8  
   } <1BK 5%?  
  } VBJ]d|  
  else if((lParam&0xc000ffff)==1){ //有键按下 , ~X;M"U  
   switch(wParam) qu+2..3  
   { @F^L4 N':  
    case VK_MENU: #.YcIR)  
     MaskBits|=ALTBIT; q:EQ,  
     break; 2kq@*}ys  
    case VK_CONTROL: 8]\h^k4f  
     MaskBits|=CTRLBIT; T+h{Aeg  
     break; FF~4y>R7u  
    case VK_SHIFT: y03a\K5[KQ  
     MaskBits|=SHIFTBIT; O Zm[i H  
     break; @ -d4kg  
    default: //judge the key and send message \#,#_  
     break; j]O[I^5  
   } ix@rq#  
   for(int index=0;index<MAX_KEY;index++){ 3uG5b8?  
    if(hCallWnd[index]==NULL) L.[uMuUa  
     continue; d<? :Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0\nhg5]?  
    { 5yi q#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .@-]A   
     bProcessed=TRUE; !!%nl_I(  
    } m (:qZW  
   } >C&<dO#i  
  } M~F2cX W  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 t~K!["g  
   for(int index=0;index<MAX_KEY;index++){ H)aC'M^  
    if(hCallWnd[index]==NULL) -xIhN?r)  
     continue; < DZ76  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Y'0?<_ fj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4 S9, tc&  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ,nRwwFd.  
   } p!QneeA`&X  
  } QfWu~[  
 } GSnHxs)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @M^Qh Hs  
} PVc|y.  
To%*)a  
  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: 'N ::MN  
T)tHN#6I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T8TsKjqOZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :gaeb8`t  
|Umfq:W`y_  
  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: hcc-J)=m  
N/{Yi _n  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dS_)ll.6z  
{ k:)u7A+  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) LEnP"o9ZW  
 { 7h&`BS  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 GiO#1gA  
  SaveBmp(); OrJlHMz  
  return FALSE; )TG0m= *  
 } LNxE-Dp  
 …… //其它处理及默认处理 ]l7\Zq  
} fA0=Y,pzv  
JgKZ;GM:W  
&~A*(+S  
  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。 maEpT43f  
+Z~!n  
  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。 `$a gM@"^  
4yZ+,hqJ<9  
  二、编程步骤 l%U_iqL&  
%R*vSRG/U  
  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"; 9Y@?xn.\  
9`n) "r  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; "mK i$FV  
z<vO#  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; >AX~c jo  
;(0$~O$3u  
  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; AD%D ,l  
bKMR7&e.Ep  
  5、 添加代码,编译运行程序。 ~TFYlV  
_AB9BQm  
三、程序代码 ?&<o_/`-H5  
c[RL Yu  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL I&fh  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) po2[uJ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ /j69NEl  
#if _MSC_VER > 1000 l(w vQO  
#pragma once 4zfRD`;  
#endif // _MSC_VER > 1000 b hr E  
#ifndef __AFXWIN_H__ ?(ls<&s{w  
#error include 'stdafx.h' before including this file for PCH J1Ki2I=  
#endif S O:V|Tfj  
#include "resource.h" // main symbols VMye5  P  
class CHookApp : public CWinApp 3) c K*8#  
{ j5h 6u,^:  
 public: MAD}Tv\S7  
  CHookApp(); <RPoQ'.^  
  // Overrides b'oGt,  
  // ClassWizard generated virtual function overrides L8]{B  
  //{{AFX_VIRTUAL(CHookApp) 1H,tP|s  
 public: 5H :~6z  
  virtual BOOL InitInstance(); =_m9so  
  virtual int ExitInstance(); `=}UFu  
  //}}AFX_VIRTUAL :{ WrS  
  //{{AFX_MSG(CHookApp) 'bI~61{A  
  // NOTE - the ClassWizard will add and remove member functions here. dbuJ~?D,  
  // DO NOT EDIT what you see in these blocks of generated code ! 6+B{4OY  
  //}}AFX_MSG " $IXZ  
  DECLARE_MESSAGE_MAP() /sT ^lf=  
}; W6Aj<{\F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6;[/ 9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1S(\2{Ylo  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [&pW&>p3  
BOOL InitHotkey(); 9ze|s^  
BOOL UnInit(); oS#'u 1k  
#endif {pb9UUP2  
H&=n:'k^  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. sL AuR  
#include "stdafx.h" :EmQ_?(^  
#include "hook.h" 4]aiT8))  
#include <windowsx.h> ./&zO{|0]  
#ifdef _DEBUG ,s><kHJ  
#define new DEBUG_NEW 'uKkl(==%  
#undef THIS_FILE %t`SSW7I  
static char THIS_FILE[] = __FILE__; ZG@M%|>  
#endif VwOG?5W/  
#define MAX_KEY 100 puS&S *  
#define CTRLBIT 0x04 m UWkb  
#define ALTBIT 0x02 =0PRAc  
#define SHIFTBIT 0x01 w&|R5Q  
#pragma data_seg("shareddata") "o{)X@YN]  
HHOOK hHook =NULL; I& M36f  
UINT nHookCount =0; jH&_E'XMX  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey JpxbB)/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT z{@R.'BD  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey *|k;a]HT  
static int KeyCount =0; >^yc=mM(g3  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Z<ajET`)  
#pragma data_seg() <wt$Gglk  
HINSTANCE hins; 'cAc{\)  
void VerifyWindow(); *j /S4qG  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Cl6m$YUt  
//{{AFX_MSG_MAP(CHookApp) B+Y5b5+wOQ  
// NOTE - the ClassWizard will add and remove mapping macros here. Z%+BWS3YqY  
// DO NOT EDIT what you see in these blocks of generated code! C1T=O  
//}}AFX_MSG_MAP a4T~\\,dZ>  
END_MESSAGE_MAP() ?AnjD8i  
2<'`^AO@  
CHookApp::CHookApp() e`Co,>W/  
{ ?jri!]ux#  
 // TODO: add construction code here, *!g 24  
 // Place all significant initialization in InitInstance ;Rhb@]X  
} dCZ\ S91q  
#`La|a.-  
CHookApp theApp; os1?6 z~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Zn@W7c,_I  
{ l@N;sI<O-  
 BOOL bProcessed=FALSE; OQ(D5GR:4  
 if(HC_ACTION==nCode) o#xgrMB  
 { LZM,QQ  
  if((lParam&0xc0000000)==0xc0000000){// Key up \T`["<  
   switch(wParam) .73zik   
   { aUW/1nQHa  
    case VK_MENU: G[3k  
     MaskBits&=~ALTBIT; 6x_ T@  
     break; 8M^wuRn  
    case VK_CONTROL: L6:W'u^  
     MaskBits&=~CTRLBIT; #M5_em4kN  
     break; i s L{9^  
    case VK_SHIFT: {[2tG U9  
     MaskBits&=~SHIFTBIT; }pMP!%|  
     break; " F-Y^  
    default: //judge the key and send message E &7@#'l  
     break;  c6Lif)4  
   } Q !9HA[Ly  
   for(int index=0;index<MAX_KEY;index++){ ,Z>wbMJig  
    if(hCallWnd[index]==NULL) e=t<H"&  
     continue; P_p6GT:5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ys-Keyg  
    { >1x7UXs~:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )Fqy%uR8  
     bProcessed=TRUE; r8uqcKfU  
    } PSTu/^  
   } t`"^7YFS>  
  } -@''[m.*  
  else if((lParam&0xc000ffff)==1){ //Key down =- $!:W~  
   switch(wParam) OlMBMUR:  
   { #B @X  
    case VK_MENU: i`prv&  
     MaskBits|=ALTBIT; YP[LQ>  
     break; 'nRp}s1^[  
    case VK_CONTROL: NJ ZXs_%>$  
     MaskBits|=CTRLBIT; n6b3E *  
     break; 6*ZU}xT  
    case VK_SHIFT: [}>#YPZ  
     MaskBits|=SHIFTBIT; 1~%o}+#-  
     break; zwK }7h6]  
    default: //judge the key and send message zKLn!b#>  
     break; NSw<t9Yi  
   } XQ]`&w(  
   for(int index=0;index<MAX_KEY;index++) #gh p/YoTq  
   { l8z%\p5cR  
    if(hCallWnd[index]==NULL) 6W5d7`A  
     continue; Lf >YdD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4s9c#nVlu  
    { YgCc|W3{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $v]T8|h  
     bProcessed=TRUE; o2DtCU-A  
    } ,I]7g4~  
   } z@zD .  
  } <^xfcYx\  
  if(!bProcessed){ L 5+J ^  
   for(int index=0;index<MAX_KEY;index++){ U,e'ZRU6  
    if(hCallWnd[index]==NULL) Bn\l'T  
     continue; #wr2imG6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) SO`dnf  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); U\Ct/U&A?  
   } Hk,lX r  
  } m$,,YKhh  
 } Rab#7Q16Q8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); '9qn*H`'  
} /I`3dWL  
1t+%Gv^sK  
BOOL InitHotkey() tJ"az=?  
{ Yi 6Nw+$  
 if(hHook!=NULL){ Rho5s@N7  
  nHookCount++; q69H ^E=  
  return TRUE; Q uB+vL  
 } Vt'L1Wr0v  
 else jZRhKT  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); KxY$PgcC  
  if(hHook!=NULL) e#.\^   
   nHookCount++; E#8_hT]5  
  return (hHook!=NULL); ~;[&K%n  
} R2l[Q){!  
BOOL UnInit() rJ DnuR  
{ [[w2p  
 if(nHookCount>1){ eK'wVg#  
  nHookCount--; NCi>S%pD`<  
  return TRUE; _?.\Xc  
 } Pey//U  
 BOOL unhooked = UnhookWindowsHookEx(hHook); iNQ0p:<k  
 if(unhooked==TRUE){ 22>;vM."  
  nHookCount=0; m%pBXXfGYj  
  hHook=NULL; 3L>d!qD  
 } Ox^:)ii  
 return unhooked; 3YW=||;|Yg  
} p #bhz5&/  
%nWe,_PjD  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~AQ>g#|%  
{ lV\lj@  
 BOOL bAdded=FALSE; &'s^nn]  
 for(int index=0;index<MAX_KEY;index++){ 8V-,Xig;`  
  if(hCallWnd[index]==0){ $Z ]z  
   hCallWnd[index]=hWnd; >B_n/v3P(M  
   HotKey[index]=cKey; #|Oj]bd(=  
   HotKeyMask[index]=cMask; nd:E9:  
   bAdded=TRUE; H-(q#?:  
   KeyCount++; ~].ggcl`w  
   break; DR@1z9 a  
  } JS!*2*Wr  
 } nLj&Uf&  
 return bAdded; @u/H8\.l  
} yxwWj>c  
/Wu|)tx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P? (vW&B  
{ 3;-^YG  
 BOOL bRemoved=FALSE; (bv,02  
 for(int index=0;index<MAX_KEY;index++){ hL!QLiF:  
  if(hCallWnd[index]==hWnd){ L,?/'!xV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ h*3{6X#(/  
    hCallWnd[index]=NULL; A2NF<ZsD  
    HotKey[index]=0; G`F8!O(  
    HotKeyMask[index]=0; "~/9F  
    bRemoved=TRUE; b{M}5~e=B  
    KeyCount--; ;wR 'z$8  
    break; RPH1''*!  
   } B76 v}O:  
  } vX;HC'%n  
 } .'1SZe7O  
 return bRemoved; /ZW&0 E  
} _9@ >;]  
>.<ooWw  
void VerifyWindow() pjw aL^  
{ -W c~B3E|  
 for(int i=0;i<MAX_KEY;i++){ _6MdF<Xb/  
  if(hCallWnd!=NULL){ B[F-gq-  
   if(!IsWindow(hCallWnd)){ ka/XK[/'  
    hCallWnd=NULL; 02\JzBU  
    HotKey=0; m!O;>D  
    HotKeyMask=0; !8R@@,_v  
    KeyCount--; }H RK?.Vj:  
   } nWJ:=JQ i"  
  } Tfx :"u  
 } .VM3D0aV  
} XV>&F{  
tHh HrMxO  
BOOL CHookApp::InitInstance() c #lPc>0xb  
{ vfwA$7N  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); d-B7["z,  
 hins=AfxGetInstanceHandle(); lw[e *q{s.  
 InitHotkey(); R-rCh.  
 return CWinApp::InitInstance(); Wto ;bd  
} C5@V/vA  
:!Ig- +W  
int CHookApp::ExitInstance() l-Nly>~  
{ i ev>9j  
 VerifyWindow(); Bs8[+Ft5  
 UnInit(); g%a|q~)  
 return CWinApp::ExitInstance(); >MG(qi  
} 2(M6(xH>  
A}5fCx.{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "e6|"w@8  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) iiG f'@/  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 8K{[2O7i)  
#if _MSC_VER > 1000 1A<,TFg  
#pragma once q; ji w#_  
#endif // _MSC_VER > 1000 ~n?>[88"  
(GcT(~Gq)D  
class CCaptureDlg : public CDialog  c</1  
{ qAY%nA>jO  
 // Construction /nZ;v4  
 public: vq!uD!lr  
  BOOL bTray; 7dOyxr"H-  
  BOOL bRegistered; zt=0o| k  
  BOOL RegisterHotkey(); z42F,4Gk  
  UCHAR cKey; 7&B$HZ  
  UCHAR cMask; LL*mgTQ  
  void DeleteIcon(); bAwl:l\`  
  void AddIcon(); Q_p[k KH  
  UINT nCount; %o w^dzW  
  void SaveBmp(); p fT60W[m  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor A],ooiq<  
  // Dialog Data }uY!(4Rw  
  //{{AFX_DATA(CCaptureDlg) 4 !#a3=_  
  enum { IDD = IDD_CAPTURE_DIALOG }; p$E8Bn%[  
  CComboBox m_Key; } JiSmi6o  
  BOOL m_bControl; qO@@8/l  
  BOOL m_bAlt; ,Hn^z<f   
  BOOL m_bShift; p'94SXO_  
  CString m_Path; d s:->+o  
  CString m_Number; 9GLb"6+PK  
  //}}AFX_DATA [10zTU`  
  // ClassWizard generated virtual function overrides hBU\'.x  
  //{{AFX_VIRTUAL(CCaptureDlg) > \Sr{p5KR  
 public: 0N:XIGFa  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]; Wx  
 protected: 58V[mlW)O0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nBItO~l  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); XORk!m|  
  //}}AFX_VIRTUAL 51B lM%  
  // Implementation H1EDMhn/  
 protected: *|#T8t,}n  
  HICON m_hIcon; G?c-79]U  
  // Generated message map functions GV.A+u  
  //{{AFX_MSG(CCaptureDlg) I97yt[,Yy  
  virtual BOOL OnInitDialog(); s{bdl[7  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); o@bNpflb`  
  afx_msg void OnPaint(); od' /%  
  afx_msg HCURSOR OnQueryDragIcon();  vZj`|  
  virtual void OnCancel(); \G |%Zw|  
  afx_msg void OnAbout(); v(]]_h  
  afx_msg void OnBrowse(); .dMVoG5  
  afx_msg void OnChange(); :9t4s#.  
 //}}AFX_MSG a->3`c  
 DECLARE_MESSAGE_MAP() |JF@6  
}; e8=YGx^o`  
#endif R&f^+0%f  
E:`v+S_h  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file %@"!8Y(j  
#include "stdafx.h" ]D 2u deg  
#include "Capture.h" "&.S&=FlI  
#include "CaptureDlg.h" 9=X)ung9  
#include <windowsx.h> LE6.nmvS  
#pragma comment(lib,"hook.lib") ^' M>r (t  
#ifdef _DEBUG hr05L<?H  
#define new DEBUG_NEW *f%>YxF  
#undef THIS_FILE txgQ"MGA%  
static char THIS_FILE[] = __FILE__; aGZi9O7G}  
#endif 3r+.N  
#define IDM_SHELL WM_USER+1 X0(tboj#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =ONHK F[UJ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^5GW$  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; cvd\/pG)  
class CAboutDlg : public CDialog G q<X4C#|  
{ }~K`/kvs  
 public: BQH}6ueZ  
  CAboutDlg(); F[ ajOb8  
  // Dialog Data "XgmuSQ!  
  //{{AFX_DATA(CAboutDlg) _5 ^I.5Z3  
  enum { IDD = IDD_ABOUTBOX }; 'B5^P  
  //}}AFX_DATA ?S$i?\Qh  
  // ClassWizard generated virtual function overrides l:#-d.z#  
  //{{AFX_VIRTUAL(CAboutDlg) XQ%4L-rhN  
 protected: :r#)z4d5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support azQD>  
  //}}AFX_VIRTUAL ev1 W6B-a  
  // Implementation 8mTM$#\  
 protected: 1NQbl+w#I  
  //{{AFX_MSG(CAboutDlg) lKWPTCU  
  //}}AFX_MSG ~S,p?I  
  DECLARE_MESSAGE_MAP() za Tb~#c_  
}; @yd4$Mv8%  
]?O2:X  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) sg'pO*_&  
{ /S5| wNu  
 //{{AFX_DATA_INIT(CAboutDlg) <@wj7\pQ  
 //}}AFX_DATA_INIT 9,j-V p!G  
} 8to8!(  
X\$ 0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) goat<\a  
{ m7EcnQf  
 CDialog::DoDataExchange(pDX); E%oY7.~-  
 //{{AFX_DATA_MAP(CAboutDlg) 6DG@?O  
 //}}AFX_DATA_MAP p'7*6bj1  
} e:H26SW  
tCxF~L@  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Z6\+  
 //{{AFX_MSG_MAP(CAboutDlg) Twn4lG4~  
 // No message handlers 8UC xn f#  
 //}}AFX_MSG_MAP FR2= las"z  
END_MESSAGE_MAP() \^I>Q _LU  
q9w~A-Oh`1  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) RrU BpqA  
: CDialog(CCaptureDlg::IDD, pParent) bVP"(H]  
{ STZPYeXE  
 //{{AFX_DATA_INIT(CCaptureDlg) s,#>m*Rh  
  m_bControl = FALSE; ;%tF58&  
  m_bAlt = FALSE; ljl^ GFo  
  m_bShift = FALSE; `.s({/|[  
  m_Path = _T("c:\\"); t!Sq A(-V  
  m_Number = _T("0 picture captured."); V%$/#sza  
  nCount=0; v8AS=sY4r  
  bRegistered=FALSE; T\~x.aH`^  
  bTray=FALSE; bR@p<;G|  
 //}}AFX_DATA_INIT =X.LA%Sf=u  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 qC F5~;7  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); [Nn`l,  
} }neY<{z  
c'/l,k  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) C8FB:JNJV  
{ __mF ?m  
 CDialog::DoDataExchange(pDX); ~4"qV_M  
 //{{AFX_DATA_MAP(CCaptureDlg) WA dCF-S  
  DDX_Control(pDX, IDC_KEY, m_Key); 4pw6bK,s2\  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); q6YXM  
  DDX_Check(pDX, IDC_ALT, m_bAlt); )K &(  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); MSf;ZB  
  DDX_Text(pDX, IDC_PATH, m_Path); KYzv$oK  
  DDX_Text(pDX, IDC_NUMBER, m_Number); F:x [  
 //}}AFX_DATA_MAP h=;{oY<V)?  
} w$JvB5O  
H":oNpfb  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2UGsYQn  
//{{AFX_MSG_MAP(CCaptureDlg) 4apL4E"r  
 ON_WM_SYSCOMMAND() II6CHjW`;  
 ON_WM_PAINT() x _c[B4Tw  
 ON_WM_QUERYDRAGICON() (5]}5W*  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) p]3?gK-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I? ,>DHUX  
 ON_BN_CLICKED(ID_CHANGE, OnChange) D3|I:Xm  
//}}AFX_MSG_MAP 9on@Q_7m  
END_MESSAGE_MAP() ~69&6C1Ch  
 w@,zFV  
BOOL CCaptureDlg::OnInitDialog() P.gb 1$7<  
{ '7O3/GDK  
 CDialog::OnInitDialog(); Gea\,{E9xA  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 13taFV dU  
 ASSERT(IDM_ABOUTBOX < 0xF000); {<<U^<6}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 1GzAG;UUo6  
 if (pSysMenu != NULL) ,v"YqD+GC5  
 { x.-+[l[1 !  
  CString strAboutMenu; / m=HG^!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); -'6Dg  
  if (!strAboutMenu.IsEmpty()) 5oAK8I  
  { | Bi!  
   pSysMenu->AppendMenu(MF_SEPARATOR); om1eQp0N  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); HTG%t/S  
  } ti \wg  
 } >y"+ -7V)  
 SetIcon(m_hIcon, TRUE); // Set big icon =>-Rnc@  
 SetIcon(m_hIcon, FALSE); // Set small icon B_.%i+ZZ  
 m_Key.SetCurSel(0); 'inFKy'H  
 RegisterHotkey(); zCk^B/j sM  
 CMenu* pMenu=GetSystemMenu(FALSE); EN/,5<S<,[  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); M3.do^ss  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 50X([hIr  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); YPxM<Gfa8  
 return TRUE; // return TRUE unless you set the focus to a control .SWlp2!M5  
} _*f`iu:`  
7 qS""f7  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) _bNzXF  
{ 7Op>i,HZk\  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) >7 ="8  
 { CB^U6ZS  
  CAboutDlg dlgAbout; v/_  
  dlgAbout.DoModal(); Hm*/C4B`  
 } \kZ?  
 else |:gf lseE  
 { ff^=Ruf$  
  CDialog::OnSysCommand(nID, lParam); m;,N)<~  
 } +U3DG$  
} hv?9*tLh0  
'tH_p  
void CCaptureDlg::OnPaint() s%W C/ZK  
{ ,y#Kv|R  
 if (IsIconic()) > ;*b|Ik  
 { uLV#SQ=bZN  
  CPaintDC dc(this); // device context for painting `x*Pof!Io  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +{oG|r3L  
  // Center icon in client rectangle c24dSNJg,  
  int cxIcon = GetSystemMetrics(SM_CXICON); U>Slc08N  
  int cyIcon = GetSystemMetrics(SM_CYICON); Qnsi`1mASr  
  CRect rect; iUN Ib  
  GetClientRect(&rect); VXwU?_4J.  
  int x = (rect.Width() - cxIcon + 1) / 2; #"G]ke1l$  
  int y = (rect.Height() - cyIcon + 1) / 2; ,0!}7;j_c  
  // Draw the icon -Ps!LI{@  
  dc.DrawIcon(x, y, m_hIcon); *_d7E   
 } 8A})V8  
 else $| @ (  
 { %V7at7>o  
  CDialog::OnPaint(); u I )6M  
 } ) AvN\sC  
} ?Wlb3;  
3ca (i/c  
HCURSOR CCaptureDlg::OnQueryDragIcon() {ttysQ-  
{ [D I+~F  
 return (HCURSOR) m_hIcon; ?82xdp g  
} 7fZDs j:  
= %TWX[w  
void CCaptureDlg::OnCancel() 9dx/hFA  
{ ) b (B  
 if(bTray) <eWf<  
  DeleteIcon(); ZbdZ rE$  
  CDialog::OnCancel(); X4~y7  
} b0Ps5G\ u  
#cI{Fe0h  
void CCaptureDlg::OnAbout() 3EPv"f^V  
{ _uy44; zq  
 CAboutDlg dlg; Po^?QVJ7  
 dlg.DoModal(); zBzZxK>$  
} Q' {M L4  
n-tgX?1'  
void CCaptureDlg::OnBrowse() zHM(!\8K  
{ ~qTx|",  
 CString str; UM"- nZ>[  
 BROWSEINFO bi; 6a~|K-a6  
 char name[MAX_PATH]; inMA:x}cF1  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); W{ q U  
 bi.hwndOwner=GetSafeHwnd(); !Wntd\w  
 bi.pszDisplayName=name; n{ar gI8wF  
 bi.lpszTitle="Select folder"; -&zZtDd F  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; rlOAo`hd  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Rl?_^dPx  
 if(idl==NULL) f.KN-f8<F  
  return; YJT&{jYi  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); OrY/`+Cog  
 str.ReleaseBuffer(); 12b(A+M   
 m_Path=str; r@H /kD  
 if(str.GetAt(str.GetLength()-1)!='\\') "#2a8#  
  m_Path+="\\"; , /Z%@-rF  
 UpdateData(FALSE); 0ypNUG}   
} ymhtX6]  
qN9(S:_Px  
void CCaptureDlg::SaveBmp() -=)H{  
{ }C"%p8=HM  
 CDC dc; NJWA3zz   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ];[}:f  
 CBitmap bm; dO! kk"qn  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^BikV  
 int Height=GetSystemMetrics(SM_CYSCREEN); *av<E  
 bm.CreateCompatibleBitmap(&dc,Width,Height); E Nh l&J  
 CDC tdc; Q{>+ft U  
 tdc.CreateCompatibleDC(&dc); <lPm1/8  
 CBitmap*pOld=tdc.SelectObject(&bm); \wz6~5R  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); l<58A7  
 tdc.SelectObject(pOld); [}E='m}u9+  
 BITMAP btm; `EA\u]PwQ  
 bm.GetBitmap(&btm); 61C7.EZZ;  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Bu~]ey1  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); P~>O S5^  
 BITMAPINFOHEADER bih; "c%0P"u  
 bih.biBitCount=btm.bmBitsPixel; =(j1rW!  
 bih.biClrImportant=0; gwuI-d^  
 bih.biClrUsed=0; d;Ym=YHJtn  
 bih.biCompression=0; :^6y7&o[  
 bih.biHeight=btm.bmHeight; *K8$eDNZ  
 bih.biPlanes=1; hd%F nykq  
 bih.biSize=sizeof(BITMAPINFOHEADER); '}53f2%gKa  
 bih.biSizeImage=size; J?"B%B5c  
 bih.biWidth=btm.bmWidth; {4<C_52t  
 bih.biXPelsPerMeter=0; N2^=E1|_  
 bih.biYPelsPerMeter=0; !C ':  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); uP)'FI  
 static int filecount=0; _^Ubs>d=*  
 CString name; NvceYKp:  
 name.Format("pict%04d.bmp",filecount++); S6Q  
 name=m_Path+name; -">;-3,K  
 BITMAPFILEHEADER bfh; u5`u>.!  
 bfh.bfReserved1=bfh.bfReserved2=0; e:DCej^z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); oM>l#><nq  
 bfh.bfSize=54+size; ~ D j8 z+^  
 bfh.bfOffBits=54; oGnSPI5KGC  
 CFile bf; w e//|fA<  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ cJ= 6r :  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )0]'QLH  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); M6 "PX *K  
  bf.WriteHuge(lpData,size); S%;O+eFYb  
  bf.Close(); i &nSh ]KK  
  nCount++; iy.p n  
 } G" qv z{*  
 GlobalFreePtr(lpData); {L{o]Ii?g  
 if(nCount==1) _}Ac n$  
  m_Number.Format("%d picture captured.",nCount); =7=]{Cx[  
 else Uiw2oi&_  
  m_Number.Format("%d pictures captured.",nCount); HAdg/3Hw  
  UpdateData(FALSE); ?=sDM& '  
} l ^0@86  
@Md/Q~>  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) hR?{3d#x2  
{ iHM%iUV  
 if(pMsg -> message == WM_KEYDOWN) hn G Z=  
 { e'NJnPO  
  if(pMsg -> wParam == VK_ESCAPE) ~w+c8c8pW  
   return TRUE; AlaW=leTe  
  if(pMsg -> wParam == VK_RETURN) 5{X<y#vAC0  
   return TRUE; {UI+$/v#  
 } y%cP1y)  
 return CDialog::PreTranslateMessage(pMsg); hED}h![  
} g wRZ%.Cn  
|tH4:%Q'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Q~ w|#  
{ 0 1rK8jX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ W' VslZG  
  SaveBmp(); tCH!my_  
  return FALSE; L ca}J&x]^  
} ~Fcm[eoC  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ kiaw4_  
 CMenu pop; Ty?cC**  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); z2~ til  
 CMenu*pMenu=pop.GetSubMenu(0); /{ g>nzP  
 pMenu->SetDefaultItem(ID_EXITICON); kS);xA8s]  
 CPoint pt; .W%)*&WH\  
 GetCursorPos(&pt); b{&)6M)zo  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Dcgo%F-W  
 if(id==ID_EXITICON) d7;um<%zn  
  DeleteIcon(); Se}c[|8  
 else if(id==ID_EXIT) zY{A'<\O  
  OnCancel(); zR:L! S  
 return FALSE; A|4[vz9>H  
} <)H9V-5aZ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); .uZ3odMlx  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) oJz^|dW  
 AddIcon(); +mj y<~\  
 return res; $qnZl'O>  
} QA`sx  
7>%8eEc  
void CCaptureDlg::AddIcon() `*R:gE=  
{ Ee! 4xg  
 NOTIFYICONDATA data; {%H'z$|{  
 data.cbSize=sizeof(NOTIFYICONDATA); %ntRG !  
 CString tip; Xc-'Y"}|`t  
 tip.LoadString(IDS_ICONTIP); T.BW H2gRP  
 data.hIcon=GetIcon(0); +'HqgSPyb  
 data.hWnd=GetSafeHwnd(); cF}".4|kZ<  
 strcpy(data.szTip,tip); !*N@ZL&X  
 data.uCallbackMessage=IDM_SHELL; F^;ez/Gl  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; V b?oJhR  
 data.uID=98; ^jZbo {  
 Shell_NotifyIcon(NIM_ADD,&data); Ow,w$0(D  
 ShowWindow(SW_HIDE); [RhO$c$[\  
 bTray=TRUE; ea 'D td  
} ^}o2  
",; H`V  
void CCaptureDlg::DeleteIcon() L#sMSVC+  
{ :DNY7TvZ  
 NOTIFYICONDATA data; 0S!K{xyR  
 data.cbSize=sizeof(NOTIFYICONDATA); ,#9PxwrO  
 data.hWnd=GetSafeHwnd(); $%#!bV  
 data.uID=98; (uE!+2C  
 Shell_NotifyIcon(NIM_DELETE,&data); ]2KihP8z x  
 ShowWindow(SW_SHOW); S4z;7z(8+  
 SetForegroundWindow(); ?N9uu4  
 ShowWindow(SW_SHOWNORMAL); YU'E@t5  
 bTray=FALSE; sUQ@7sTj  
} ?0SJfh  
hHnYtq  
void CCaptureDlg::OnChange() @I?=<Riu  
{ BQMpHSJ_  
 RegisterHotkey(); n{mfn *r.  
} + [mk<pQ  
?Z/V~,  
BOOL CCaptureDlg::RegisterHotkey() b3, _(;A!  
{ H*CW1([  
 UpdateData(); /y}xX  
 UCHAR mask=0; 9rf)gU3{+L  
 UCHAR key=0; 8<Av@9 *}  
 if(m_bControl) )Ql%r?(F+  
  mask|=4; Vt#.eL)Ee  
 if(m_bAlt) e(t\g^X  
  mask|=2; E:nF$#<'N  
 if(m_bShift) NC(~l  
  mask|=1; zQd 2  
  key=Key_Table[m_Key.GetCurSel()]; )+DmOsH  
 if(bRegistered){ 8{sGNCvU  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); _-g&PXH  
  bRegistered=FALSE; #@Jq~$N|  
 } Ad_h K O  
 cMask=mask; %Q|Atgp  
 cKey=key; zK@@p+n_#.  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); HG^'I+Yn  
 return bRegistered; &Z%?!.4j@  
} jNk%OrP]  
~Mxvq9vaD  
  四、小结 VMWf>ZU  
0@oJFJrO  
  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:
10+5=?,请输入中文答案:十五