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
  • 5338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: ]q/USVj{  
  I.it4~]H  
  一、实现方法 D9!$H!T _  
?hYWxWW  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: J3$@: S'  
tGF3Hw^mS  
#pragma data_seg("shareddata") tac\Ki?  
HHOOK hHook =NULL; //钩子句柄 6G{ Q@  
UINT nHookCount =0; //挂接的程序数目 $e:bDZ(hjj  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 #I\" 'n5M  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 V3ExS1fNf  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <==6fc>s  
static int KeyCount =0; gBOF#"-  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Hyi'z1  
#pragma data_seg() odn3*{c{x  
'V\V=yc1  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 R{pF IyR  
4hzdc ] a  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: @@cc /S  
}b]eiPWN  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 7&u$^c S(  
cKey,UCHAR cMask) WEtPIHruyt  
{ !|8"}ZF  
 BOOL bAdded=FALSE; &@=W+A=c~  
 for(int index=0;index<MAX_KEY;index++){ #7@p  
  if(hCallWnd[index]==0){ [S9"' ^H  
   hCallWnd[index]=hWnd; BZ(I]:oDL  
   HotKey[index]=cKey; 1x8wQ/p|  
   HotKeyMask[index]=cMask; ^bq,+1;@Q  
   bAdded=TRUE; 5 v^tPGg4  
   KeyCount++; }G<~Cx5[  
   break; rU6A^p\,  
  } FIUQQQ\3  
 } / }*}r  
 return bAdded; u:^sEk"Lk'  
} <GF^VT|Ce  
//删除热键 !t}yoN n|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z\cD98B#  
{ ]r'D  
 BOOL bRemoved=FALSE; kK/XYC 0D  
 for(int index=0;index<MAX_KEY;index++){ qae|?z  
  if(hCallWnd[index]==hWnd){ MBAj.J  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Qe-PW9C  
    hCallWnd[index]=NULL; <W+9 h0c  
    HotKey[index]=0; AH_qZTv0{Q  
    HotKeyMask[index]=0; Wb[k2V  
    bRemoved=TRUE; ("{"8   
    KeyCount--; }Rw6+;  
    break; X4{<{D`0t8  
   } S&QXf<v  
  } BWNI|pq)v  
 } SM8_C!h:  
 return bRemoved; >GLoeCRNu  
} pw`'q(ad  
2[qoqd(  
`F3wO!  
  DLL中的钩子函数如下: E^$8nqCL:  
lQEsa45  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) EWQLLH"h  
{ Y[H769  
 BOOL bProcessed=FALSE; @_W13@|  
 if(HC_ACTION==nCode) a&UzIFdB  
 { +(y 8q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 J 5';Hb)  
   switch(wParam) \+=`o .2  
   {  mxpj<^n}  
    case VK_MENU: q;UGiB^(A  
     MaskBits&=~ALTBIT; yDWBrN._  
     break; \BN$WV  
    case VK_CONTROL: { {:Fs  
     MaskBits&=~CTRLBIT; %ZX9YuXQ  
     break; :(wFNK/0{  
    case VK_SHIFT: k1ja ([Q  
     MaskBits&=~SHIFTBIT; FBbaLqgVF{  
     break; (=%0$(S>  
    default: //judge the key and send message <fF|AbC:  
     break; noM=8C&U  
   } 1vxQ`)a  
   for(int index=0;index<MAX_KEY;index++){ Gp+\}<^ Z  
    if(hCallWnd[index]==NULL) '.M4yif \g  
     continue; 43]y]/do  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v5@M 34  
    { &AWrM{e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *")*w> R  
     bProcessed=TRUE; e<*qaUI  
    } F-oe49p5e  
   } >\w]i*%  
  } Cs y,3XG  
  else if((lParam&0xc000ffff)==1){ //有键按下 IN.g  
   switch(wParam) W)J MV  
   { ?c+$9  
    case VK_MENU: *8po0s  
     MaskBits|=ALTBIT; f*xr0l  
     break; :0QDV~bs  
    case VK_CONTROL: ^;rjs|`K#  
     MaskBits|=CTRLBIT; CWocb=E  
     break; 0{vH.b @  
    case VK_SHIFT: AI Kz]J0;  
     MaskBits|=SHIFTBIT; wc. =`Me  
     break; iy_Y!wZ{  
    default: //judge the key and send message '&dT   
     break; "j8)l4}  
   } O5Z9`_9<  
   for(int index=0;index<MAX_KEY;index++){ OM{^F=Ap  
    if(hCallWnd[index]==NULL) @d^Z^H*Y v  
     continue; {L ~d ER  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "|[9 Q?  
    { Z)2d4:uv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~LZrhwVj$  
     bProcessed=TRUE; GZ,MC?W  
    } =B5{7g\  
   } x^EW'-a  
  } 74MxU  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Mgi~j.[  
   for(int index=0;index<MAX_KEY;index++){ ; +(VO  
    if(hCallWnd[index]==NULL) q6w)zTpJGJ  
     continue; d;]m wLB0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E #B$.K  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); J-<_e??  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Tjq1[Wq  
   } 3Ovx)qKxd  
  } n6+h;+8;]  
 } T!ZjgCY}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); JJ%@m;~  
} CbC [aVA=  
1[8^JVC>6  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: i?;#Z Nh  
s)`(@"{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6lv@4R^u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kLF`6ZXtd  
[rWBVfm  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: =gD)j&~}_  
X:$vP'B>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yF? O+9R A  
{ )Uy%iE*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) !Q15qvRS  
 { *DC/O( 0  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 1n[)({OQ  
  SaveBmp(); 8.n#@%  
  return FALSE; vxTn  
 } _:=\h5}8  
 …… //其它处理及默认处理 z!O;s ep?/  
} 6V%}2YE?X  
rKUtTj  
'jfE?ngt  
  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。 z k/`Uz  
6PYt>r&TO  
  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。 W"\}##  
6j XDLI  
  二、编程步骤 n]`]gLF\i  
#Iv KI+"  
  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"; a1y<Y`SC9  
'ia-h7QWS  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; {?0'(D7.  
I9qFXvqL  
  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; /MY's&D(  
SsTBjIX  
  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; O- QT+]  
-d A9x~o  
  5、 添加代码,编译运行程序。 M,@M5o2u  
Nh}-6|M  
三、程序代码 P dqvXc  
bE.<vF&  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 4@3\Ihv  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) c-(RjQ~M5  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 'g)f5n a[  
#if _MSC_VER > 1000 Lv['/!DJ|  
#pragma once dN3^PK  
#endif // _MSC_VER > 1000 RU7+$Z0K  
#ifndef __AFXWIN_H__ C/Tk`C&  
#error include 'stdafx.h' before including this file for PCH N=Ct3  
#endif `e<IO_cg  
#include "resource.h" // main symbols %xCL&}bY  
class CHookApp : public CWinApp SoM,o]s#y  
{ JxtzI2  
 public: Gg9s.]W  
  CHookApp(); P|@[D=y  
  // Overrides i@nRZ$K  
  // ClassWizard generated virtual function overrides iKE&yO3  
  //{{AFX_VIRTUAL(CHookApp) Awxm[:r>^  
 public: N^$q;%  
  virtual BOOL InitInstance(); #%k_V+o3  
  virtual int ExitInstance(); 8c-ys-"#  
  //}}AFX_VIRTUAL iv_3R}IbX  
  //{{AFX_MSG(CHookApp) JI]Lz1i  
  // NOTE - the ClassWizard will add and remove member functions here. 9!n95  
  // DO NOT EDIT what you see in these blocks of generated code ! y EfAa6  
  //}}AFX_MSG s(3u\#P  
  DECLARE_MESSAGE_MAP() m_oUl(pk  
}; 'Xwv,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~6kF`}5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9;v3 (U+:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <Hr<QiAK  
BOOL InitHotkey(); #1E4 R}B  
BOOL UnInit(); \Hrcf+`  
#endif Y GOkqI  
*sU,waX  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. W7WHDL^  
#include "stdafx.h" \99'#]\_/E  
#include "hook.h" ]NTQF/   
#include <windowsx.h> G<-KwGy,D  
#ifdef _DEBUG &,%n  
#define new DEBUG_NEW JseKqJ?g  
#undef THIS_FILE Jw}t~m3  
static char THIS_FILE[] = __FILE__; [;,E cw^  
#endif S1^/W-yoc~  
#define MAX_KEY 100 r+ 8Tp|%  
#define CTRLBIT 0x04 Db|JR  
#define ALTBIT 0x02  VQH48{X  
#define SHIFTBIT 0x01 [k\VUg:P  
#pragma data_seg("shareddata") /!5ohQlPJ  
HHOOK hHook =NULL; PWl;pBo  
UINT nHookCount =0; KBtqtE'(L  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey bT2c&VPCE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT XLpn3sX$  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey *uRDB9#9,  
static int KeyCount =0; E*5aLT5!,  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift * cW%Q@lit  
#pragma data_seg() ^-PYP:*  
HINSTANCE hins; "r@#3T$  
void VerifyWindow(); 5}hQIO&^%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) z_xy*Iif  
//{{AFX_MSG_MAP(CHookApp) 9_5>MmiB  
// NOTE - the ClassWizard will add and remove mapping macros here. 5A`>3w{3n  
// DO NOT EDIT what you see in these blocks of generated code! 0Sd>*nC  
//}}AFX_MSG_MAP ASoBa&vX  
END_MESSAGE_MAP() p1niS:}j  
e_epuki  
CHookApp::CHookApp() j:1N&7<FU  
{ 02;'"EmP$  
 // TODO: add construction code here, Tdh.U {Nz  
 // Place all significant initialization in InitInstance >l)x~Bkf$j  
} 33lh~+C  
,^c-}`!K  
CHookApp theApp; Uz_ob9l<#H  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,0h{RZKw  
{ qbq2Bi'a  
 BOOL bProcessed=FALSE; HLDv{G'7  
 if(HC_ACTION==nCode) 8/R$}b><  
 { P{K\}+9F   
  if((lParam&0xc0000000)==0xc0000000){// Key up 5 ,MM`:{{  
   switch(wParam) [rcM32  
   { :!Q(v(M  
    case VK_MENU: Pzzzv^+  
     MaskBits&=~ALTBIT; 4K:Aqqhds  
     break; )fXw~  
    case VK_CONTROL: F~eYPaEKy!  
     MaskBits&=~CTRLBIT; z.hq2v  
     break; U9`Co&Z2  
    case VK_SHIFT: n-M6~   
     MaskBits&=~SHIFTBIT; >qy62:co  
     break; `$1A;wg<  
    default: //judge the key and send message TxQsi"0c  
     break; SHPDbBS  
   } d1g7:s9$0  
   for(int index=0;index<MAX_KEY;index++){ (G+)v[f  
    if(hCallWnd[index]==NULL) :^?-bppYW  
     continue; ,/p+#|>C=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ou4hAm91s  
    { $> QJ%v9+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); {wSz >,  
     bProcessed=TRUE; nt>3i! l  
    } /!Ag/SmS!9  
   } P|ibUxSA~,  
  } j07A>G-=  
  else if((lParam&0xc000ffff)==1){ //Key down Cd^1E]O0{  
   switch(wParam) q/*veL  
   { 3:WHC3}W  
    case VK_MENU: <bW~!lv  
     MaskBits|=ALTBIT; <Sd ef^  
     break; (kX:@9Pn  
    case VK_CONTROL: 3; z1Hp2X  
     MaskBits|=CTRLBIT; uYlyU~M:D  
     break; m=h/A xW  
    case VK_SHIFT: !sI^Lh,Y  
     MaskBits|=SHIFTBIT; P*;[&Nn4  
     break; 9wfE^E1  
    default: //judge the key and send message w8q 2f-K-  
     break; F# 9^RA)9  
   } ZGh6- /  
   for(int index=0;index<MAX_KEY;index++) <n k/w5nKL  
   { #o~C0`8!B=  
    if(hCallWnd[index]==NULL) %?V~7tHm>  
     continue; v\9f 8|K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `Zmdlp@  
    { eW<NDI&b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `j'1V1  
     bProcessed=TRUE; |AExaO"jk  
    } T-4dD  
   } 3jfAv@I~  
  } n|H8O3@  
  if(!bProcessed){ 0[Yks NNl1  
   for(int index=0;index<MAX_KEY;index++){ !} x-o`a5  
    if(hCallWnd[index]==NULL) mBye)q$  
     continue; //r)dN^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) yZ=O+H  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \kI{#   
   } X<Xiva85  
  } WaX!y$/z  
 } 0r$n  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \uo{I~Qd  
} G,WLca[  
]!"7k_  
BOOL InitHotkey() j7I?K :op=  
{ H^o_B1  
 if(hHook!=NULL){ Y>c+j  
  nHookCount++; Rc9>^>w  
  return TRUE; 1)97AkN(O  
 } a|]deJU^  
 else .*"KCQGOgM  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); \TzBu?,v8  
  if(hHook!=NULL) #:Q\   
   nHookCount++; QS4~":D/C  
  return (hHook!=NULL); S~m8j |3K  
} nRX'J5Q m<  
BOOL UnInit() (u@X5O(a  
{ /i_FA]Go  
 if(nHookCount>1){ C %j%>X`  
  nHookCount--; g 6?y{(1  
  return TRUE; W%&s$b(  
 } ?%ltoezf  
 BOOL unhooked = UnhookWindowsHookEx(hHook); I%Z=O=  
 if(unhooked==TRUE){ b!J?>du  
  nHookCount=0; rR{KnM  
  hHook=NULL; CO, {/  
 } gE*7[*2?t  
 return unhooked; zFYzus`>  
} 'O2/PU2_  
Y HS/|-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yZoJD{'?Sw  
{ ON>l%Ae4G  
 BOOL bAdded=FALSE; ZhRdml4U2  
 for(int index=0;index<MAX_KEY;index++){ iM1E**WCtv  
  if(hCallWnd[index]==0){ g^po$%I '  
   hCallWnd[index]=hWnd; :YX5%6  
   HotKey[index]=cKey; iN0'/)ar  
   HotKeyMask[index]=cMask; :T@} CJ  
   bAdded=TRUE; 'F/uD 1;  
   KeyCount++; c% wztP;L  
   break; jc !V|w^  
  } %ib7)8Ki0  
 } 'vq0Tw5  
 return bAdded; x{G 'IEf  
} f4 +P2j  
]TtID4qL  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) muK.x7zyl  
{ e6 <9`Xg  
 BOOL bRemoved=FALSE; TZg1,Z  
 for(int index=0;index<MAX_KEY;index++){ t1yfSStp  
  if(hCallWnd[index]==hWnd){ >@a7Zzl0H  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 77+3CME{'  
    hCallWnd[index]=NULL; @x[A ^  
    HotKey[index]=0; k %sxA  
    HotKeyMask[index]=0; P,G :9x"e  
    bRemoved=TRUE; 5w~J"P6jg  
    KeyCount--; y^Q);siSy  
    break; sUiO~<Ozpk  
   } oxnI/Z  
  } +l]> (k.2  
 } M,oZ_tY%  
 return bRemoved; k7sD"xR3  
} dxS5-aWy9w  
Cd6th F)  
void VerifyWindow() 33~8@]b  
{ y G mFi  
 for(int i=0;i<MAX_KEY;i++){ at\u7>;.^k  
  if(hCallWnd!=NULL){ ]j*uD317  
   if(!IsWindow(hCallWnd)){ :7Uv)@iUk  
    hCallWnd=NULL; '<e$ c  
    HotKey=0; 4}*.0'Hz  
    HotKeyMask=0; 9`^(M^|c  
    KeyCount--; k`z]l;:  
   } S|6i]/  
  } xj AU Csq  
 } f4f)9n  
} f?16%Rk<  
(m2_Eh;  
BOOL CHookApp::InitInstance() ?h| DeD!s  
{ [yc7F0Aw  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); H_| re  
 hins=AfxGetInstanceHandle(); M*Q}^<E*  
 InitHotkey(); $n47DW &  
 return CWinApp::InitInstance(); Z?&ZgaSz  
} /m^G 99N  
:}#j-ZCC"  
int CHookApp::ExitInstance() xDS]k]/(T  
{ Z@*!0~NH=4  
 VerifyWindow(); *<"{(sAvk  
 UnInit(); *p\fb7Pu_3  
 return CWinApp::ExitInstance(); !4Sd^"  
} zITxJx  
i]@k'2N  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file NweGK  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) im)r4={ 9  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ v:w^$]4  
#if _MSC_VER > 1000 \;Q!}_ K  
#pragma once cBOt=vg,5  
#endif // _MSC_VER > 1000 4? rEO(SZ  
1M55!b  
class CCaptureDlg : public CDialog |(,{&\  
{  =Uo*-EH  
 // Construction d{B0a1P  
 public: bcxR7<T,"9  
  BOOL bTray; ,I]]52+?4  
  BOOL bRegistered; tqpi{e  
  BOOL RegisterHotkey(); 0G Q8} r  
  UCHAR cKey; 6g#E/{kQw  
  UCHAR cMask; X(8LhsP  
  void DeleteIcon(); iO18FfM_  
  void AddIcon(); -r~9'aEs  
  UINT nCount; <*/Z>Z_c2  
  void SaveBmp();  b=Ektq  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor @LS%uqs  
  // Dialog Data J*6B~)Sp@  
  //{{AFX_DATA(CCaptureDlg) 3Q7PY46  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7Xh @%[   
  CComboBox m_Key; )"2eN3H/  
  BOOL m_bControl; ,4-],~T  
  BOOL m_bAlt; x'6i9]+r  
  BOOL m_bShift; 9JILK9mVO  
  CString m_Path; 8|L5nQ  
  CString m_Number; & \"cV0  
  //}}AFX_DATA W(-son~I  
  // ClassWizard generated virtual function overrides e(&u3 #7Nn  
  //{{AFX_VIRTUAL(CCaptureDlg) )Q}Q -Zt  
 public: R,OT\FQ<  
  virtual BOOL PreTranslateMessage(MSG* pMsg); \TDn q!)?  
 protected: Zz 'g&ewo  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `/i/AZ{  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^AXH}g  
  //}}AFX_VIRTUAL Xw|-v$'y  
  // Implementation 9.#")%_p  
 protected: #8BI`.t)j  
  HICON m_hIcon; X_Pbbx_j  
  // Generated message map functions z-sq9Qp&x  
  //{{AFX_MSG(CCaptureDlg) Z^WI~B0nt  
  virtual BOOL OnInitDialog(); YzEOfHL,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); r5$!41   
  afx_msg void OnPaint(); VOg'_#I  
  afx_msg HCURSOR OnQueryDragIcon(); -?IF'5z  
  virtual void OnCancel(); * {p:C  
  afx_msg void OnAbout(); N6A|  
  afx_msg void OnBrowse(); xnw'&E  
  afx_msg void OnChange(); (VHPcoL  
 //}}AFX_MSG WV p6/HS  
 DECLARE_MESSAGE_MAP() R 4DfqX  
}; NMrf I0tbG  
#endif "st+2#{  
txX>zR*)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Z\n^m^Z =  
#include "stdafx.h" EF9Y=(0|  
#include "Capture.h" |;p.!FO  
#include "CaptureDlg.h" 4gmlK,a  
#include <windowsx.h> 8R(l~  
#pragma comment(lib,"hook.lib") i;IhsKO0R  
#ifdef _DEBUG Nm%#rZrN~Q  
#define new DEBUG_NEW Uw3wR!:  
#undef THIS_FILE |X6R 2I  
static char THIS_FILE[] = __FILE__; Rz*GRe  
#endif 6 lEv<)cC  
#define IDM_SHELL WM_USER+1 vuJEPn%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); AOV{@ b(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _?I*:: I  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 34_ V&8  
class CAboutDlg : public CDialog 7lwFxP5QT  
{ ) <w`:wD  
 public: U5?QneK  
  CAboutDlg(); t23W=U  
  // Dialog Data ]z# Ita;  
  //{{AFX_DATA(CAboutDlg) hC]:+.Q+  
  enum { IDD = IDD_ABOUTBOX }; ?k^m|Z  
  //}}AFX_DATA P1$D[aF9$  
  // ClassWizard generated virtual function overrides dAM]ZR<  
  //{{AFX_VIRTUAL(CAboutDlg) [ThAv Q_$  
 protected: L EFLKC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xv%]g= Q  
  //}}AFX_VIRTUAL GE !p  
  // Implementation W}%[i+  
 protected: 6%wlz%Fp  
  //{{AFX_MSG(CAboutDlg) "t-9q  
  //}}AFX_MSG |=:hUp Jp  
  DECLARE_MESSAGE_MAP() l%2 gM7WMY  
}; n5tsaU;  
ETdN<}m  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :$P1ps3B  
{ cXYE !(  
 //{{AFX_DATA_INIT(CAboutDlg) Q `-Xx  
 //}}AFX_DATA_INIT :C={Z}t/F  
} B9c gVTLj  
~JS@$#  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /o}i,i$  
{ ^^a%Lz)U  
 CDialog::DoDataExchange(pDX); >8$Lqj^i  
 //{{AFX_DATA_MAP(CAboutDlg) ::cI4D  
 //}}AFX_DATA_MAP L{&Yh|}  
} )YwLj&e4tf  
oP:R1<  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) QDb8W*&<  
 //{{AFX_MSG_MAP(CAboutDlg) ?_T[]I'  
 // No message handlers g+?2@L$L  
 //}}AFX_MSG_MAP g{kjd2  
END_MESSAGE_MAP() 7fl{<uf  
s={IKU&m[  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) p+7#`iICE  
: CDialog(CCaptureDlg::IDD, pParent) 4|4[3Ye7u:  
{ @_ UI;*V  
 //{{AFX_DATA_INIT(CCaptureDlg) @`iz0DPG?Y  
  m_bControl = FALSE; jTW8mWNk]  
  m_bAlt = FALSE; t=jG$A  
  m_bShift = FALSE; ^U,Dx  
  m_Path = _T("c:\\"); gplrJaH@  
  m_Number = _T("0 picture captured."); i#*lK7  
  nCount=0; 7[0CVWs,  
  bRegistered=FALSE; 4jjo%N  
  bTray=FALSE; }n"gX>e~  
 //}}AFX_DATA_INIT BhiOV_}Hn  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 :" JEC'  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); PM&NY8|Zy  
} QpS7 nGev  
jI<_(T  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {*<%6?  
{ 82o|(pw  
 CDialog::DoDataExchange(pDX); :H:+XIgoR  
 //{{AFX_DATA_MAP(CCaptureDlg) -e0?1.A$  
  DDX_Control(pDX, IDC_KEY, m_Key); WKwYSbs(  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3|EAOoWnK  
  DDX_Check(pDX, IDC_ALT, m_bAlt); h&~9?B  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 2~V"[26t  
  DDX_Text(pDX, IDC_PATH, m_Path); \zOsq5}  
  DDX_Text(pDX, IDC_NUMBER, m_Number); !lM.1gTTC  
 //}}AFX_DATA_MAP ]a[2QQ+g  
} :0bjPQj  
u0qTP]  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]8 <`&~a  
//{{AFX_MSG_MAP(CCaptureDlg) F4ylD5Y!  
 ON_WM_SYSCOMMAND() x<.(fRv   
 ON_WM_PAINT() n{M-t@r7  
 ON_WM_QUERYDRAGICON() )d|s$l$?7  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) jBd=!4n  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  J2Qt!-  
 ON_BN_CLICKED(ID_CHANGE, OnChange) k$kxw_N5d  
//}}AFX_MSG_MAP n_wF_K\h  
END_MESSAGE_MAP() 7c6- o"A  
)lJi7 ^,  
BOOL CCaptureDlg::OnInitDialog() ]c]^(C  
{ 3/]~#y%2  
 CDialog::OnInitDialog(); t5P8?q\  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); f6PYB&<1  
 ASSERT(IDM_ABOUTBOX < 0xF000); J.O{+{&cd  
 CMenu* pSysMenu = GetSystemMenu(FALSE); KJs`[,;<  
 if (pSysMenu != NULL) Kb'4W-&u!  
 { LX=cx$K  
  CString strAboutMenu; %Z-xh< &  
  strAboutMenu.LoadString(IDS_ABOUTBOX); u 7 <VD  
  if (!strAboutMenu.IsEmpty()) *uKYrs [  
  { u_FN'p=.  
   pSysMenu->AppendMenu(MF_SEPARATOR); BQs\!~Ux2  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !"'6$"U\K  
  } t oM+Bd:Y  
 } RS@G.|  
 SetIcon(m_hIcon, TRUE); // Set big icon :u)Qs#'29  
 SetIcon(m_hIcon, FALSE); // Set small icon YHxQb$v)  
 m_Key.SetCurSel(0); qt4%=E;[  
 RegisterHotkey(); ,4;'s  
 CMenu* pMenu=GetSystemMenu(FALSE); B$S@xD $  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~~Rq$'q}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); abS3hf  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); !JVv`YN  
 return TRUE; // return TRUE unless you set the focus to a control F'JT7# eX  
} 8I<j"6`+Q  
A.RG8"  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) xmfZ5nVL  
{ ~aXJ5sY"f&  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lwjA07 i  
 { 64^l/D(  
  CAboutDlg dlgAbout; PI"6d)S2  
  dlgAbout.DoModal(); '?LqVzZI  
 } kxmsrQ>av  
 else o"kL,&  
 { <)"i'v $  
  CDialog::OnSysCommand(nID, lParam); f'BmIFb#  
 } Gh<#wa['}  
} Kk|)N3AV:  
sLSH`Xy?5  
void CCaptureDlg::OnPaint() $bN_0s0:'  
{ l%qh^0  
 if (IsIconic()) =Q6JXp  
 { ^b^buCYw  
  CPaintDC dc(this); // device context for painting E 5mYFVK  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); FV/lBWiQQ  
  // Center icon in client rectangle e2pFX?  
  int cxIcon = GetSystemMetrics(SM_CXICON); + +Eu.W;&#  
  int cyIcon = GetSystemMetrics(SM_CYICON); Ri*mu*r\}  
  CRect rect; p4 $4;)  
  GetClientRect(&rect); Jyp7+M]  
  int x = (rect.Width() - cxIcon + 1) / 2; phwBil-vUU  
  int y = (rect.Height() - cyIcon + 1) / 2; B3I0H6O  
  // Draw the icon #T8PgmR  
  dc.DrawIcon(x, y, m_hIcon); 1DN  
 }  xS="o  
 else 3-)R'  
 { NL'(/|)  
  CDialog::OnPaint(); IBW-[lr7  
 } `1#Z9&bO  
} :W+%jn  
K 28s<i`  
HCURSOR CCaptureDlg::OnQueryDragIcon() n1b^o~agwC  
{ hE'>8{  
 return (HCURSOR) m_hIcon; [}}q/7Lp  
} at\$ IK_  
:w7?]y6~S  
void CCaptureDlg::OnCancel() i 1GQ=@  
{ fVi[mH0=+  
 if(bTray) ucJ8l(?Qc  
  DeleteIcon(); .sb0|3&  
  CDialog::OnCancel(); 4y $okn\}i  
} TxTxyYd  
%H3 iX^}*  
void CCaptureDlg::OnAbout() *9`k$'  
{ uX6rCokr  
 CAboutDlg dlg; '}q/;}ih  
 dlg.DoModal(); t$lJgj(  
}  gOp81)  
PeSTUR&  
void CCaptureDlg::OnBrowse() - <tTT  
{ *r|1 3|k  
 CString str; /sqfw,h@  
 BROWSEINFO bi; {yMkd4v  
 char name[MAX_PATH]; !yz3:Yzu  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :J+ANIRI  
 bi.hwndOwner=GetSafeHwnd(); N5tFEV'G  
 bi.pszDisplayName=name; ^}<]sjmk  
 bi.lpszTitle="Select folder"; (.b!kfC  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; g O8~$Aj  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 'Hu+8,xA  
 if(idl==NULL) @2>ce2+  
  return; YI]/gWeu  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); nd5.Py$  
 str.ReleaseBuffer(); !"ydl2  
 m_Path=str; }T53y6J#  
 if(str.GetAt(str.GetLength()-1)!='\\') I,r0K]  
  m_Path+="\\"; 8SCXA9}  
 UpdateData(FALSE); c#@L~<  
} <irr .O  
-1ci.4F&  
void CCaptureDlg::SaveBmp() eUD 5 V  
{ ;h#Q!M&e#  
 CDC dc; +hs:W'`%  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); aED73:b  
 CBitmap bm; C k/DV  
 int Width=GetSystemMetrics(SM_CXSCREEN); #.LI `nYA  
 int Height=GetSystemMetrics(SM_CYSCREEN); vpdT2/F  
 bm.CreateCompatibleBitmap(&dc,Width,Height); B~ j3!?  
 CDC tdc; X#X/P  
 tdc.CreateCompatibleDC(&dc); V]Uc@7S/  
 CBitmap*pOld=tdc.SelectObject(&bm); $4]4G=o  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); q{!ft9|K\d  
 tdc.SelectObject(pOld); ?` 2z8uD/  
 BITMAP btm; 7b R[.|T  
 bm.GetBitmap(&btm); i3>_E <"9  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; >=3oe.$)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); w; :{  
 BITMAPINFOHEADER bih; }G"bD8+  
 bih.biBitCount=btm.bmBitsPixel; C *7x7|z  
 bih.biClrImportant=0; <4I`|D3@  
 bih.biClrUsed=0; s|R`$+'{  
 bih.biCompression=0; ~SwGZ  
 bih.biHeight=btm.bmHeight; OSwum!hzN  
 bih.biPlanes=1; O1oh,~W  
 bih.biSize=sizeof(BITMAPINFOHEADER); t*-_MG  
 bih.biSizeImage=size; 5K =>x<  
 bih.biWidth=btm.bmWidth; #z c$cr  
 bih.biXPelsPerMeter=0; ]hbrzv o  
 bih.biYPelsPerMeter=0; &b]_#c   
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); j(c;r>  
 static int filecount=0; p`'3Il3  
 CString name; )0=H)k0  
 name.Format("pict%04d.bmp",filecount++); ]zI*}(adu  
 name=m_Path+name; ;NGSJfn  
 BITMAPFILEHEADER bfh; ~^o YPd52*  
 bfh.bfReserved1=bfh.bfReserved2=0; m;vm7]5  
 bfh.bfType=((WORD)('M'<< 8)|'B'); l_ LH!Tu  
 bfh.bfSize=54+size; HUel  
 bfh.bfOffBits=54; Q@C  y\l  
 CFile bf; ! z5Ozm+}  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ - R`nitf  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;20sh^~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); JRDIGS_~  
  bf.WriteHuge(lpData,size); c7R6.T  
  bf.Close(); !]&+g'aC3  
  nCount++; LXRIo2ynuw  
 } x. /WP~I  
 GlobalFreePtr(lpData); 4u1au1c  
 if(nCount==1) YIHGXi<"n  
  m_Number.Format("%d picture captured.",nCount); bq{eu#rQJ  
 else  X$_z"t  
  m_Number.Format("%d pictures captured.",nCount); )%hW3w  
  UpdateData(FALSE); jori,"s  
} WH. 3  
fhro"5/4  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) O/oLQoH  
{ l^__oam  
 if(pMsg -> message == WM_KEYDOWN) QL-E4]   
 { [`1@`5SL-  
  if(pMsg -> wParam == VK_ESCAPE) \CYKj_c  
   return TRUE; :7s2M  
  if(pMsg -> wParam == VK_RETURN) B06W(y,3Q>  
   return TRUE; 1:q`KkJx  
 } nDz.61$[  
 return CDialog::PreTranslateMessage(pMsg); '.7ER  
} W'v o?  
RVr5^l;"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1\/^X>@W{  
{ *tl;0<n  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7<LCX{Uw  
  SaveBmp(); K>#QC  
  return FALSE; tl=e!  
} D+Z2y1  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ zTw<9Nf  
 CMenu pop; 1#|qT7  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); W O'nW  
 CMenu*pMenu=pop.GetSubMenu(0); QF$s([  
 pMenu->SetDefaultItem(ID_EXITICON); (?[%u0%_  
 CPoint pt; _I0=a@3  
 GetCursorPos(&pt); +rka 5ts  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); HzAw rC  
 if(id==ID_EXITICON) S|m|ulB  
  DeleteIcon(); P o\d!  
 else if(id==ID_EXIT) N <M6~  
  OnCancel();  bDq<]h_7  
 return FALSE; xr31< 4B  
} WFvVu3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Dt'bbX'edw  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) t* =i8`8  
 AddIcon(); L^Fb;sJYI  
 return res; Gf-GDy\{  
} *d-JAE  
C-^8;xd  
void CCaptureDlg::AddIcon() r(g# 3i4Q  
{ K!v\r"N  
 NOTIFYICONDATA data; jN/snU2\0  
 data.cbSize=sizeof(NOTIFYICONDATA); jT4 m(j  
 CString tip; e[db?f2!  
 tip.LoadString(IDS_ICONTIP); =TA8]7S~U  
 data.hIcon=GetIcon(0); 7 LiyA<  
 data.hWnd=GetSafeHwnd(); a._>?rVy  
 strcpy(data.szTip,tip); vJ>o9:(6  
 data.uCallbackMessage=IDM_SHELL; ((6?b5[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~e686L0j  
 data.uID=98; EU'P U  
 Shell_NotifyIcon(NIM_ADD,&data); `KieN/d%  
 ShowWindow(SW_HIDE); s@*i  
 bTray=TRUE; X#ud_+6x  
} B_"PFWwg  
|J~A )Bw?  
void CCaptureDlg::DeleteIcon() &pH XSU  
{  8(}cbW  
 NOTIFYICONDATA data; b.cBg.a  
 data.cbSize=sizeof(NOTIFYICONDATA); -v9x tNg  
 data.hWnd=GetSafeHwnd(); H?;@r1ZAn  
 data.uID=98; u0%bv\$m  
 Shell_NotifyIcon(NIM_DELETE,&data); 9T<k|b[6  
 ShowWindow(SW_SHOW); af&P;#U  
 SetForegroundWindow(); v|nt(-JX  
 ShowWindow(SW_SHOWNORMAL); <=%G%V_s  
 bTray=FALSE; LKg9{0Y:  
} tYx>?~   
k|cP]p4,  
void CCaptureDlg::OnChange() ;b 'L2  
{ 5YXMnYt9  
 RegisterHotkey(); _RWH$L9  
} M`?ATmYy  
)!'7!" $  
BOOL CCaptureDlg::RegisterHotkey() yp< )v(8|'  
{ dlwOmO'Bm)  
 UpdateData(); fbJa$  
 UCHAR mask=0; Eg1|Kg\&  
 UCHAR key=0; )IKqO:@  
 if(m_bControl) !#S"[q  
  mask|=4; HC| ]Au  
 if(m_bAlt) w]US-7  
  mask|=2; I:YE6${k!  
 if(m_bShift) !4$-.L)#  
  mask|=1; ]!2[kA-  
  key=Key_Table[m_Key.GetCurSel()]; ESuP ZB  
 if(bRegistered){ pJ/{X=y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); +ux`}L(  
  bRegistered=FALSE; 1/A|$t[  
 } 5qkyi]/U8  
 cMask=mask; ',I$`h  
 cKey=key; vQ >8>V  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Lv *USN  
 return bRegistered; =P,pW  
} K~~LJU3  
/pJr%}sc  
  四、小结 \+<=O`  
d26#0Gt-4i  
  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