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
  • 5903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: cVxO\M  
  C^B$_?  
  一、实现方法 RU6c 8>"  
kb/BE J  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: #wRhR>6  
_TsN%)m  
#pragma data_seg("shareddata") 1t?OD_d!8  
HHOOK hHook =NULL; //钩子句柄 GU@#\3  
UINT nHookCount =0; //挂接的程序数目 cRbA+0m>  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 q%$p56\?3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 >C6S2ISSz  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey hqjjd-S0  
static int KeyCount =0; )b2O!p  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 * O?Yp%5NH  
#pragma data_seg() Q#qfuwz  
i+~BVb  
  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。 2?Jw0Wq5D  
tQNrDp+  
  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: C3f\E: D)  
9=T;Dxn  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ;A7JX:*?y=  
cKey,UCHAR cMask) xypgG;`\  
{ SvvNk  
 BOOL bAdded=FALSE; w <"mS*Q  
 for(int index=0;index<MAX_KEY;index++){ &$_!S!Sa/  
  if(hCallWnd[index]==0){ eQ8t.~5;-  
   hCallWnd[index]=hWnd; dlCYdwP  
   HotKey[index]=cKey; wik<# ke  
   HotKeyMask[index]=cMask; C|3Xz[k{  
   bAdded=TRUE; g<0K i^#  
   KeyCount++; J!5b~8`v  
   break; CZeZk  
  } =4SXntU!e  
 } 62_k`)k  
 return bAdded; =*lBJ-L  
} X _@|+d  
//删除热键 $HQ4o\~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S!z3$@o  
{ J+ S]Qoz  
 BOOL bRemoved=FALSE; Q25VG5 G  
 for(int index=0;index<MAX_KEY;index++){ u)o-H!a  
  if(hCallWnd[index]==hWnd){ QQV8Vlv"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lA/-fUA  
    hCallWnd[index]=NULL; vBF9!6X.  
    HotKey[index]=0; $*%,  
    HotKeyMask[index]=0; T7.SjR6X>  
    bRemoved=TRUE; Jx}-Y* o  
    KeyCount--; j_<!y(W  
    break; "P(obk  
   } $rr@3H+  
  } v)_FiY QQ6  
 } ?(d1;/0v>  
 return bRemoved; Y.Z:H!P);$  
} K@cWg C  
~KkC089D  
b$#b+G{y  
  DLL中的钩子函数如下: we^' R}d  
+BL46 Bq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) X"_ ^^d-  
{ sHk>ek]2I  
 BOOL bProcessed=FALSE;   P3|s}&  
 if(HC_ACTION==nCode) 0!lWxS0#=  
 { ][?J8F  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 QOg >|"KL  
   switch(wParam) ; xp-MK  
   {  >|kD(}Axf  
    case VK_MENU: id5`YA$  
     MaskBits&=~ALTBIT; gz[3xH~  
     break; ;xzaW4(3  
    case VK_CONTROL: 1Pw1TO"Z  
     MaskBits&=~CTRLBIT; VlA]A,P}i  
     break; ;zD4 #7=  
    case VK_SHIFT: >Q=^X3to  
     MaskBits&=~SHIFTBIT; Q#H"Se  
     break; R3|4|JlGR  
    default: //judge the key and send message \#dacQ2E@  
     break; N\|z{vn  
   } ] T]{VB  
   for(int index=0;index<MAX_KEY;index++){ *OFG3uM  
    if(hCallWnd[index]==NULL) &U|c=$!\  
     continue; B^P&+,\[}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &*+$38XE^  
    { 0`c{9gY.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2y^:T'p  
     bProcessed=TRUE; , %z HykP  
    } sV%DX5@  
   } wv{ Qx^  
  } C2v_] ,]  
  else if((lParam&0xc000ffff)==1){ //有键按下 !.mR]El{K  
   switch(wParam) !aF~5P7%  
   { V27RK-.N!  
    case VK_MENU: ' :B;!3a0d  
     MaskBits|=ALTBIT; -~ ~h1  
     break; Zc1x"j  
    case VK_CONTROL: si6CWsb_f  
     MaskBits|=CTRLBIT; ;j1E6  
     break; iD_y@+iz  
    case VK_SHIFT: T Q4L~8  
     MaskBits|=SHIFTBIT; T&]-p:mg^  
     break; |JYb4J4Ni  
    default: //judge the key and send message QWfSm^ t  
     break; {P~rf&Ee  
   } >rEZ$h  
   for(int index=0;index<MAX_KEY;index++){ C){Q;`M-<  
    if(hCallWnd[index]==NULL) Sf*v#?  
     continue; 13 #ff  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \'j(@b,  
    { S5TVfV5LI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Z@+nkTJ9&t  
     bProcessed=TRUE; /v5A)A$7  
    } EyPJ Jc8  
   } V2T% tn;rp  
  } 2Wluc37  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Vl5>o$G|<.  
   for(int index=0;index<MAX_KEY;index++){ o$.#A]Flb  
    if(hCallWnd[index]==NULL) >{Hg+/  
     continue; %CiF;wJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9!Mh (KtQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (=7"zE Cq#  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 g[pU5%|"[  
   } ~KS@Ulrox  
  } Zhfg  
 } pK3A/ry<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @y;VV*  
} .@OQ$ D<  
[d[w/@  
  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: 2'S&%UyP  
63u%=-T%a  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VmPh''Z%-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lY tt|J  
^{MqJ\S7H  
  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: +M I{B="7.  
4DCh+|r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) z f SE7i0  
{ ^w1+b;)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) }UW*[dCf>C  
 { ,jg #^47I  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 nA,=g'7S  
  SaveBmp(); ,R`CAf%*  
  return FALSE; "73y}'  
 } K& ^qn&  
 …… //其它处理及默认处理 lUEbxN  
} St%x\[D  
+-|""`I1I  
^ul1{  
  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。 0@ "'SKq  
)Ac,F6w  
  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。 +S(# 7  
Zwc&4:5%  
  二、编程步骤 ?;W"=I*3  
~3:hed7:  
  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"; d5gwc5X  
NzQvciJ@"  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; [y`G p#  
EZB0qZIp  
  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; -6- sI  
'69)m~B0a  
  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; .2JZ7  
>]~581fYf  
  5、 添加代码,编译运行程序。  : Z<\R0  
PDD2ouv4  
三、程序代码 *b) (-#w3  
l.pxDMY  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL $mGzJ4&  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) VX.LL 5  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ j "<?9/r  
#if _MSC_VER > 1000 &EV%g6  
#pragma once WS n>P7sY  
#endif // _MSC_VER > 1000 1i z =i^}  
#ifndef __AFXWIN_H__ ^aAs=KditO  
#error include 'stdafx.h' before including this file for PCH fW2NYQP$:  
#endif > "F-1{  
#include "resource.h" // main symbols g3kbsi7_:  
class CHookApp : public CWinApp Gpxp8[ {  
{ Q"FN"uQ}x  
 public: ivo><"Y(r  
  CHookApp(); IwnDG;+Ap  
  // Overrides S,:!H@~B  
  // ClassWizard generated virtual function overrides EX{%CPp7}  
  //{{AFX_VIRTUAL(CHookApp) [IOI&`?D  
 public: _)5E=  
  virtual BOOL InitInstance(); 5CK\Z'c~!  
  virtual int ExitInstance(); O oA!N-Q  
  //}}AFX_VIRTUAL t!rrYBSCr  
  //{{AFX_MSG(CHookApp) -r cEG!  
  // NOTE - the ClassWizard will add and remove member functions here. _oc6=Z  
  // DO NOT EDIT what you see in these blocks of generated code ! q&@s/k  
  //}}AFX_MSG SzpUCr"  
  DECLARE_MESSAGE_MAP() xFp$JN  
}; zy$jTqDH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); m=9b/Nr4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RM_%u=jC  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *]yrN`  
BOOL InitHotkey(); ?+hEs =Xs  
BOOL UnInit(); 4Y59^  
#endif g$GGo[_0  
Iz+%wAZ|B6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _=I1  
#include "stdafx.h" 'hr_g* i  
#include "hook.h" %^lD  
#include <windowsx.h> tdRvg7v,N%  
#ifdef _DEBUG L3I$ K+c  
#define new DEBUG_NEW %l&oRBC  
#undef THIS_FILE k5-4^  
static char THIS_FILE[] = __FILE__; JR `$t~0t  
#endif xwD`R *  
#define MAX_KEY 100 >|%3j,<U  
#define CTRLBIT 0x04 [6l0|Y  
#define ALTBIT 0x02 F;#$Q  
#define SHIFTBIT 0x01 Gz{%Z$A~o  
#pragma data_seg("shareddata") kB@gy}  
HHOOK hHook =NULL; _0Ea 3K  
UINT nHookCount =0; O)&W0` VY  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey l GYW[0dy  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ddN(L`nd  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey eoww N>-2C  
static int KeyCount =0; Tfh2>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7#j.y f4  
#pragma data_seg() 7 w,D2T  
HINSTANCE hins; k ?KJ8  
void VerifyWindow(); ( xooU 8d  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =|AYT6z,  
//{{AFX_MSG_MAP(CHookApp) }d}sC\>U  
// NOTE - the ClassWizard will add and remove mapping macros here. ] hK}ASC  
// DO NOT EDIT what you see in these blocks of generated code! %7mGMa/  
//}}AFX_MSG_MAP :u9'ZHkZ  
END_MESSAGE_MAP() DQ+6VPc^o  
ZbT$f^o}M]  
CHookApp::CHookApp() <Mvni z  
{ k^ZP~.G  
 // TODO: add construction code here, W6>t!1oO+  
 // Place all significant initialization in InitInstance .:&`PaMt  
} ep"{{S5g  
9+9g(6  
CHookApp theApp; \9`E17i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V. i{IW  
{ &X:;B'   
 BOOL bProcessed=FALSE; 8:c=h/fa  
 if(HC_ACTION==nCode) v zs4tkG  
 { fD[O tc  
  if((lParam&0xc0000000)==0xc0000000){// Key up OcV,pJ  
   switch(wParam) KS(H_&j  
   { AjEy@ /  
    case VK_MENU: =_BHpgL  
     MaskBits&=~ALTBIT; Y)/|C7~W  
     break; e bp t/q[  
    case VK_CONTROL: %2dzx[s  
     MaskBits&=~CTRLBIT; PY_8*~Z  
     break; 4r4 #u'Om  
    case VK_SHIFT: sm'_0EUg  
     MaskBits&=~SHIFTBIT; j=T8 b  
     break; bDl#806PL  
    default: //judge the key and send message %C`P7&8m=O  
     break; N,lr~ 6)  
   } ]:LlOv$  
   for(int index=0;index<MAX_KEY;index++){ U%bm{oVn  
    if(hCallWnd[index]==NULL) z<9C-  
     continue; *;}xg{@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D*2*FDGI  
    { 5QK%BiDlr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); J/P[9m30[  
     bProcessed=TRUE; +pG+ xI  
    } t[+bZUS$~  
   } 2F*>&n&Db7  
  } zx<PX  
  else if((lParam&0xc000ffff)==1){ //Key down  ^cw9Yjh6  
   switch(wParam) v|~=rvXFC  
   { 3m75mny  
    case VK_MENU: Nzgi)xX0HX  
     MaskBits|=ALTBIT; v\|jkzR5Y  
     break; `w#VYs|k  
    case VK_CONTROL: TO89;O  
     MaskBits|=CTRLBIT; \{ | GK  
     break; (U# ,;  
    case VK_SHIFT: G@Z%[YNw  
     MaskBits|=SHIFTBIT; KF#^MEw%  
     break; I1m[M?  
    default: //judge the key and send message RK-bsf  
     break; dQSO8Jf  
   } g]Y%c73  
   for(int index=0;index<MAX_KEY;index++) k%gj  
   { TaSS) n  
    if(hCallWnd[index]==NULL) c&wg`1{Hal  
     continue; }=v4(M`%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~vt*%GN3  
    { w( SY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A^M]vk%dg  
     bProcessed=TRUE; 'cc8 xC  
    } $"NH{%95}  
   } [err$  
  } x&DqTX?b,  
  if(!bProcessed){ d #1& "(   
   for(int index=0;index<MAX_KEY;index++){ >)C7IQ/  
    if(hCallWnd[index]==NULL) \:Tq0|]Px  
     continue; 9d|8c > I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \5&Mg81  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); R98YGW_ dT  
   } zAM9%W2v_  
  } *w0|`[P+h  
 } nG3SDL#(k  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); n\D/WLvM  
} `XE>Td>Bs  
Dk sn  
BOOL InitHotkey() Drtg7v{@\  
{ M2ex 3m  
 if(hHook!=NULL){ G{6@]72  
  nHookCount++; 8D`+3  
  return TRUE; Xj+_"0 #  
 } l(rm0_  
 else i/-IjgM"-  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); p5E okh  
  if(hHook!=NULL) !yj1X Ar  
   nHookCount++; C)FO:lLr\  
  return (hHook!=NULL); @C@9Tw2Y  
} lz>00B<Z  
BOOL UnInit() 7r?,wM  
{ Y>aVnixx<  
 if(nHookCount>1){ GC# [&>L  
  nHookCount--; |sr\SCx  
  return TRUE; *:d ``L  
 } r3?8nQ$  
 BOOL unhooked = UnhookWindowsHookEx(hHook); yLLA:5Q1  
 if(unhooked==TRUE){ ):hz /vZ  
  nHookCount=0; N LpKh1g  
  hHook=NULL; SaGI4O_\s  
 } tH;9"z# ~  
 return unhooked; <2@t ~ 9  
} X\!q8KEpR&  
Txo{6nd/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {J1rjrPo  
{ XM!oN^  
 BOOL bAdded=FALSE; KO8vUR*2R  
 for(int index=0;index<MAX_KEY;index++){ [dLc+h1{B  
  if(hCallWnd[index]==0){ `f}ZAX  
   hCallWnd[index]=hWnd; bE% Hm!  
   HotKey[index]=cKey; Q (N'Oj:J  
   HotKeyMask[index]=cMask; (9( xJ)  
   bAdded=TRUE; "UD)3_R  
   KeyCount++; VB  |k  
   break; Mz$qe  
  } >DY/CcG\P  
 } Z(RsB_u5  
 return bAdded; 3F;0a ;[  
} m`zd0IRTP  
V9< E `C  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) chD7 ^&5]  
{ fXnTqKAfu6  
 BOOL bRemoved=FALSE; _Q^jk0K8ga  
 for(int index=0;index<MAX_KEY;index++){ z|AknEE,  
  if(hCallWnd[index]==hWnd){ &/uakkS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {=I,+[(  
    hCallWnd[index]=NULL; "K>!+<  
    HotKey[index]=0; 9{nU\am!\  
    HotKeyMask[index]=0; X)]>E]X  
    bRemoved=TRUE; !V#*(_+n  
    KeyCount--; pHVDug3  
    break; o(v`  
   } Z{(Gib~{N  
  } !^L}LtqHI  
 } as 3uz  
 return bRemoved; _d~GY,WTdO  
} |:(BI5&S  
k(>J?\iNW  
void VerifyWindow() PNLlJlYlP  
{ 24InwR|^  
 for(int i=0;i<MAX_KEY;i++){ YVRE 9  
  if(hCallWnd!=NULL){ _`QMEr?  
   if(!IsWindow(hCallWnd)){ jyg>'"W  
    hCallWnd=NULL;  gHUW1E  
    HotKey=0; .w\4Th#  
    HotKeyMask=0; a&[[@1OY  
    KeyCount--; yT3K 2A  
   } ~O./A-l  
  } M[b~5L+S  
 } (1{OQ0N+x  
} A+Je?3/.  
FhH*lO&  
BOOL CHookApp::InitInstance() cQh{z8Bf?<  
{ (ce)A,;  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); zXGI{P0O  
 hins=AfxGetInstanceHandle(); Q!~1Xc0S`p  
 InitHotkey(); -=rGN"(M _  
 return CWinApp::InitInstance(); /s)It  
} 25, [<Ao  
;ACeY  
int CHookApp::ExitInstance() O{]}{Ss  
{ 4b yh,t  
 VerifyWindow(); w\t  
 UnInit(); .*FlB>1jy  
 return CWinApp::ExitInstance(); 'uUa|J1mu  
} Jz;`L3m  
z SsogAx  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *qMjoP,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~U?vB((j!  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ &n6 |L8  
#if _MSC_VER > 1000 Z+J~moW `  
#pragma once N9)ERW2`*  
#endif // _MSC_VER > 1000 /$vX1T  
\<%FZT_4~  
class CCaptureDlg : public CDialog &@7|_60  
{ K1<l/ s  
 // Construction N/^[c+J  
 public: l%2B4d9"v  
  BOOL bTray; 1 d.>?^uE  
  BOOL bRegistered; y;9K  
  BOOL RegisterHotkey(); gJOswN;([  
  UCHAR cKey; )[sSCt]  
  UCHAR cMask; #@5 jOi  
  void DeleteIcon(); CA"`7<,  
  void AddIcon(); n |,}   
  UINT nCount; 4P24ySy9F  
  void SaveBmp(); y7*^H  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor BYS>"  
  // Dialog Data 9*|An  
  //{{AFX_DATA(CCaptureDlg) Ke&fTK  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;rF:$37^  
  CComboBox m_Key; gY=+G6;=<  
  BOOL m_bControl; 6d 8n1_  
  BOOL m_bAlt; kS7T'[d  
  BOOL m_bShift; J _|>rfW  
  CString m_Path; wVs|mG"  
  CString m_Number; YX2j;Y?  
  //}}AFX_DATA pk=z<OTb  
  // ClassWizard generated virtual function overrides M[T!AO-S$  
  //{{AFX_VIRTUAL(CCaptureDlg) p:U{3uN 62  
 public: 3^ &pb  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]@1ncn7N  
 protected: RzSN,bL R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support p7O4CP>9[  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); p/s5[>N  
  //}}AFX_VIRTUAL :(x 90;DW  
  // Implementation /%N~$ &wW  
 protected: wA)R7%&  
  HICON m_hIcon; XlNB9\"5  
  // Generated message map functions s*}d`"YvH  
  //{{AFX_MSG(CCaptureDlg) ?at~il$z'  
  virtual BOOL OnInitDialog(); PsD]gN5"  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); sAc)X!}  
  afx_msg void OnPaint(); 0P53dF  
  afx_msg HCURSOR OnQueryDragIcon(); &jPsdv h  
  virtual void OnCancel(); gzdgnF2  
  afx_msg void OnAbout(); 8|Y^z_C  
  afx_msg void OnBrowse(); 8i"{GGVC  
  afx_msg void OnChange(); {gi"ktgk  
 //}}AFX_MSG 1Kebl  
 DECLARE_MESSAGE_MAP() u09OnP\  
}; kp;MNRc  
#endif Z#W`0G>'  
L,X6L @Q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9k"nx ,"  
#include "stdafx.h" #wm)e)2@  
#include "Capture.h" \J\1i=a-=  
#include "CaptureDlg.h" ZNA?`Z)f  
#include <windowsx.h> ?,),%JQ  
#pragma comment(lib,"hook.lib") ]g+(#x_.?  
#ifdef _DEBUG IweQB}d  
#define new DEBUG_NEW uTJ?@ ^nq  
#undef THIS_FILE Cw^)}23R  
static char THIS_FILE[] = __FILE__; EGMcU| yL  
#endif wy&*6>.  
#define IDM_SHELL WM_USER+1 O "h+i>|l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n:!J3pR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I2l'y8)d  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; a+BA~|u^  
class CAboutDlg : public CDialog {k]VT4/  
{ `RzM)ILl  
 public: \1B*iW  
  CAboutDlg(); SoY&R=  
  // Dialog Data Ia"bP` L  
  //{{AFX_DATA(CAboutDlg) :3Jh f$  
  enum { IDD = IDD_ABOUTBOX }; ,[hJi3xM  
  //}}AFX_DATA {DO9{96w4  
  // ClassWizard generated virtual function overrides 0UB'6wRVo  
  //{{AFX_VIRTUAL(CAboutDlg) XKK*RVs#  
 protected: <(t<gS#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JT-Zo OZ  
  //}}AFX_VIRTUAL Cw2+@7?|  
  // Implementation n*xNMw1x"T  
 protected: aY+>85?g  
  //{{AFX_MSG(CAboutDlg) LtvyWc`  
  //}}AFX_MSG Q\z*q,^R  
  DECLARE_MESSAGE_MAP() |Z/ySAFM  
}; &boBu^,94  
?8nG F%p  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Zj^H3 h  
{ @<sP1`1  
 //{{AFX_DATA_INIT(CAboutDlg) Z,&ywMm/G  
 //}}AFX_DATA_INIT 5LK>n-  
} ]- `{kX  
\%VoX` B  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) g?+P&FL#I  
{ ?{dno=  
 CDialog::DoDataExchange(pDX); O&0R ~<n  
 //{{AFX_DATA_MAP(CAboutDlg) [(K^x?\Y0'  
 //}}AFX_DATA_MAP dk ?0r  
} C|JWom\J  
>) ^!gz8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Q'Tn+}B&  
 //{{AFX_MSG_MAP(CAboutDlg) /][U$Q;Ke  
 // No message handlers ljCgIfZ_4  
 //}}AFX_MSG_MAP ?0<3"2Db~  
END_MESSAGE_MAP() =@f;s<v/  
0&-sz=L  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #,;k>2j0  
: CDialog(CCaptureDlg::IDD, pParent) Y#5S;?bR  
{ ]_,~q@r$  
 //{{AFX_DATA_INIT(CCaptureDlg) *]=)mM#  
  m_bControl = FALSE; BW;u? 1Xa  
  m_bAlt = FALSE; _B[(/wY  
  m_bShift = FALSE; yiUdUw/  
  m_Path = _T("c:\\"); uQNoIy J)  
  m_Number = _T("0 picture captured."); oAx0$]+%V)  
  nCount=0; WQ]pg "  
  bRegistered=FALSE; N!3f1d7RQ  
  bTray=FALSE; \3/9lE|gh  
 //}}AFX_DATA_INIT Pg36'aTe%j  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 :U> oW97l  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); U|QDV16f  
} |g{AD`  
57}q'84  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "8I4]'  
{ T_dd7Ym'8  
 CDialog::DoDataExchange(pDX); \NqC i'&  
 //{{AFX_DATA_MAP(CCaptureDlg) D. e*IP1R  
  DDX_Control(pDX, IDC_KEY, m_Key); {m?x},  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); $} Myj'`r  
  DDX_Check(pDX, IDC_ALT, m_bAlt); |+bG~~~%j  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 3PGyqt(   
  DDX_Text(pDX, IDC_PATH, m_Path); (!(bysi9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); F*=RP$sj  
 //}}AFX_DATA_MAP B+LNDnjO]  
} 1d"P) 3dQ  
Y4O L 82Y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) jj2UUQ|  
//{{AFX_MSG_MAP(CCaptureDlg) 4Ojw&ys@V  
 ON_WM_SYSCOMMAND() .%A2  
 ON_WM_PAINT() \v_C7R;&  
 ON_WM_QUERYDRAGICON() ,d+mT^jN  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2vC=.1k  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2 *$n?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) wGH@I_cy>  
//}}AFX_MSG_MAP DPOPRi~  
END_MESSAGE_MAP() Ah`dt8t  
'3Ie0QO]"%  
BOOL CCaptureDlg::OnInitDialog() s$_#T  
{ K36B9<F  
 CDialog::OnInitDialog(); g]#Wve  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (Wqhuw!u  
 ASSERT(IDM_ABOUTBOX < 0xF000); (YOgQ)},  
 CMenu* pSysMenu = GetSystemMenu(FALSE); LayU)TIt  
 if (pSysMenu != NULL) 8gNEL+  
 { nmGHJb,$  
  CString strAboutMenu; a5M>1&j/eC  
  strAboutMenu.LoadString(IDS_ABOUTBOX); <GN?J.B  
  if (!strAboutMenu.IsEmpty()) De_</1Au!2  
  { as4NvZ@+r  
   pSysMenu->AppendMenu(MF_SEPARATOR); %-Z~f~<?  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); w$4Lu"N :  
  } O|~'-^  
 } xJhbGK  
 SetIcon(m_hIcon, TRUE); // Set big icon d#Ajb  
 SetIcon(m_hIcon, FALSE); // Set small icon ]N_^{k,  
 m_Key.SetCurSel(0); 8.':pY'8"  
 RegisterHotkey(); =*Xf(mhc  
 CMenu* pMenu=GetSystemMenu(FALSE); M jTKM;  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Hi9z<l=$  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9_3M}|V$^e  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); &?6w 2[}  
 return TRUE; // return TRUE unless you set the focus to a control \tx/!tA  
} }nl)*l  
rYQ@"o0/Y  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) GB3B4)cX4Y  
{ : 4WbDeR  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) l0{DnQA>I  
 { P}`1#$  
  CAboutDlg dlgAbout; ?xZmm%JF  
  dlgAbout.DoModal(); }q W aE  
 } VHCzlg  
 else h6i{5\7.  
 { Gu).*cU  
  CDialog::OnSysCommand(nID, lParam); rR~X>+K  
 } w ZAXfNA  
} ~0|hobk  
2\de |'  
void CCaptureDlg::OnPaint() Fr3t [:D  
{ x["  
 if (IsIconic()) nif' l/@"  
 { Rn_c9p  
  CPaintDC dc(this); // device context for painting #7h fEAk  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); V&H8-,7z  
  // Center icon in client rectangle (02(:;1  
  int cxIcon = GetSystemMetrics(SM_CXICON); w>_EM&r6~u  
  int cyIcon = GetSystemMetrics(SM_CYICON); nh)R  
  CRect rect; `F8;{`a  
  GetClientRect(&rect); w.p'Dpw  
  int x = (rect.Width() - cxIcon + 1) / 2; t8 "-zd8  
  int y = (rect.Height() - cyIcon + 1) / 2; {W<-f?  
  // Draw the icon jqWvLBU!  
  dc.DrawIcon(x, y, m_hIcon); ^6>|!  
 } ycD.:w p\'  
 else YCO:bBmp:  
 { W2qQKv  
  CDialog::OnPaint(); %)Dd{|c  
 } QL18MbfqP  
} )fc"])&8  
:w%b w\}  
HCURSOR CCaptureDlg::OnQueryDragIcon()  q)+ n2FM  
{ {+9\o ~  
 return (HCURSOR) m_hIcon; n9!3h?,g  
} [)>8z8'f  
mp3_n:R?  
void CCaptureDlg::OnCancel() x)ZH;)  
{ }Xv1KX'  
 if(bTray) 1iL xXd  
  DeleteIcon(); }F6b ]  
  CDialog::OnCancel(); G | oG:  
} T k&9Klo  
%nf=[f  
void CCaptureDlg::OnAbout() g8A{aHb1}  
{ !13 /+ u  
 CAboutDlg dlg; %5?-g[  
 dlg.DoModal(); | V,jd  
} S@NhEc  
6D"`FPC  
void CCaptureDlg::OnBrowse() w]o5L  
{ G;c0  
 CString str; 6RQCKN)  
 BROWSEINFO bi; k+GnF00N^8  
 char name[MAX_PATH]; bI6wE'h  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); <SdJM1%Qo  
 bi.hwndOwner=GetSafeHwnd(); .eB"la|d  
 bi.pszDisplayName=name; c G!2Iy~lA  
 bi.lpszTitle="Select folder"; =2]rA  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; VQjFEJ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6v O)s!b  
 if(idl==NULL) 6-14Htsk6  
  return; 4 Olv8nOe<  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); h=r< B\Pa  
 str.ReleaseBuffer(); P3ev 4DL  
 m_Path=str; L4*fF  
 if(str.GetAt(str.GetLength()-1)!='\\') K |} ]<  
  m_Path+="\\"; JD`;,Md  
 UpdateData(FALSE); udI: ]:,P  
} ,h.Jfo54,  
yi-"hT`  
void CCaptureDlg::SaveBmp() A<X :K nl  
{ j{Jc6U  
 CDC dc; U{uWk3I_b  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Qwo9>ClC  
 CBitmap bm; wDMB  
 int Width=GetSystemMetrics(SM_CXSCREEN); #s R0*  
 int Height=GetSystemMetrics(SM_CYSCREEN); A6y~_dt  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Hs -.83V  
 CDC tdc; _QUu'zJ  
 tdc.CreateCompatibleDC(&dc); V3~a!k  
 CBitmap*pOld=tdc.SelectObject(&bm); 8421-c6y>  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); jI2gi1 ,a  
 tdc.SelectObject(pOld); bW.zxQ :  
 BITMAP btm; * r4/|.l  
 bm.GetBitmap(&btm); ^'53]b:  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; SOQ-D4q  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "q>I?UcZ  
 BITMAPINFOHEADER bih; gXLZ)>+A+  
 bih.biBitCount=btm.bmBitsPixel; /Q>{YsRRB  
 bih.biClrImportant=0; 3/IWO4?_  
 bih.biClrUsed=0; dzE Q$u/I  
 bih.biCompression=0; wt=>{JM  
 bih.biHeight=btm.bmHeight; E(3+o\w  
 bih.biPlanes=1; D)ne *},  
 bih.biSize=sizeof(BITMAPINFOHEADER); 6O@ ^`T  
 bih.biSizeImage=size; w$[Ds  
 bih.biWidth=btm.bmWidth; mImbS)V  
 bih.biXPelsPerMeter=0; ?"<r9S|[O  
 bih.biYPelsPerMeter=0; IQi[g~E.5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [(hvK {)  
 static int filecount=0; 9_A0:S9Z  
 CString name; /xm#:+Sc  
 name.Format("pict%04d.bmp",filecount++); U[e8K  
 name=m_Path+name; cvXI]+`<3\  
 BITMAPFILEHEADER bfh; +s(IQt  
 bfh.bfReserved1=bfh.bfReserved2=0; K9O,7h:x  
 bfh.bfType=((WORD)('M'<< 8)|'B'); &J/4J  
 bfh.bfSize=54+size; 3auJ^B}  
 bfh.bfOffBits=54; 9H, &nET  
 CFile bf; &G@-yQ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .Lr)~  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); G<^]0`"+)t  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "kBqY+:Cn  
  bf.WriteHuge(lpData,size); p1VahjRE-  
  bf.Close(); r {B,uj"  
  nCount++; fov=Yd!  
 } +x9"#0|k;  
 GlobalFreePtr(lpData); Q#ZD&RZ9.  
 if(nCount==1) ks%7W -  
  m_Number.Format("%d picture captured.",nCount); a[74%L?  
 else [' OCw {<  
  m_Number.Format("%d pictures captured.",nCount); 1S[5#ewB;j  
  UpdateData(FALSE); Gz[ym j)5  
} e=n{f*KG`  
7fW=5wc  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) hr!f: D  
{ n@07$lY@;  
 if(pMsg -> message == WM_KEYDOWN) ADv"_bB:h  
 { {Sr=SE  
  if(pMsg -> wParam == VK_ESCAPE) +G!jKta7B  
   return TRUE; r0g/:lJi  
  if(pMsg -> wParam == VK_RETURN) D"x$^6`c}  
   return TRUE; F@K*T2uh  
 } ? __aVQ7  
 return CDialog::PreTranslateMessage(pMsg); d7_g u  
} VM]GYz|#]  
N{hF [F  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7tfivIj)e  
{ ueE?"Hk  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _D2bGZN  
  SaveBmp(); Y7:Y{7E7  
  return FALSE; [6_Du6\h  
} 3b?OW7H  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 8pq-nuf|K  
 CMenu pop; MCi`TXr  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^0s\/qyqm  
 CMenu*pMenu=pop.GetSubMenu(0); kToVBU$  
 pMenu->SetDefaultItem(ID_EXITICON); @`kiEg'Q  
 CPoint pt; d(DX(xg  
 GetCursorPos(&pt); xf^<ec  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )p!*c,  
 if(id==ID_EXITICON) a:-)+sgHw  
  DeleteIcon(); aZawBU.:  
 else if(id==ID_EXIT) 7Js>!KR  
  OnCancel(); .?i-rTF:  
 return FALSE; C'8!cPFVv  
} EOBs}M;  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =,AC%S_D~  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) orB8Q\p'  
 AddIcon(); KYkS6|A  
 return res; L*UV  
} ~ gfA](N  
:zj9%4A  
void CCaptureDlg::AddIcon() 2-$bh  
{ [j=,g-EOA  
 NOTIFYICONDATA data; ^)hAVf~E  
 data.cbSize=sizeof(NOTIFYICONDATA); @m/;ZQ  
 CString tip; Tbi]oB#  
 tip.LoadString(IDS_ICONTIP); >9.5-5"   
 data.hIcon=GetIcon(0); Wiq{wxe  
 data.hWnd=GetSafeHwnd(); 0j{F^rph  
 strcpy(data.szTip,tip); |ilv|UV  
 data.uCallbackMessage=IDM_SHELL; XJ:>UNf5;  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; q4 Oxs  
 data.uID=98; 7ZV~op2Q  
 Shell_NotifyIcon(NIM_ADD,&data); up3?$hUc.  
 ShowWindow(SW_HIDE); T}n}.JwU  
 bTray=TRUE; J+}+ "h~.  
} {ywXz|TP  
wUK7um  
void CCaptureDlg::DeleteIcon() o9m  
{ tIGVB+g{F  
 NOTIFYICONDATA data; B=Zl&1  
 data.cbSize=sizeof(NOTIFYICONDATA); lJ:M^.Em0  
 data.hWnd=GetSafeHwnd(); d`9W  
 data.uID=98; jF38kj3O7  
 Shell_NotifyIcon(NIM_DELETE,&data); c?!YFm  
 ShowWindow(SW_SHOW); /lS+J(I  
 SetForegroundWindow(); /B,:<&_-  
 ShowWindow(SW_SHOWNORMAL); RHwaJ;:)#  
 bTray=FALSE; =mHkXHE~:  
} E7X!cm/2<  
KMK&[E#r  
void CCaptureDlg::OnChange() IU Y> ih  
{ :H!(?(Pie  
 RegisterHotkey(); @,x_i8  
} 6%gB E  
}A4nJ>`tq  
BOOL CCaptureDlg::RegisterHotkey() hncS_ZA  
{ Pv/Pww \  
 UpdateData(); )|w*/JK\Z  
 UCHAR mask=0; N+CXOI=6x  
 UCHAR key=0; [F/^J|VMV  
 if(m_bControl) %s$rP  
  mask|=4; yaH Trh%  
 if(m_bAlt) V&Xi> X8  
  mask|=2; y4xT:G/M  
 if(m_bShift) 3[0w+{ (Q  
  mask|=1; X5uS>V%/  
  key=Key_Table[m_Key.GetCurSel()]; ] vC=.&]  
 if(bRegistered){ 1Yc%0L(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); hD nM+4D  
  bRegistered=FALSE; _\ .  
 } Xh.+pJl,*  
 cMask=mask; {fog<1c  
 cKey=key; U/T4i#  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); xT9Yes&  
 return bRegistered; ''#p47$8<d  
} ?mH@`c,fM  
],;D2]<s  
  四、小结 p+, 1Fi  
cQ8dc+ {  
  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
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
10+5=?,请输入中文答案:十五