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
  • 6552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: k%8kt4\wn6  
  U# IPYyV  
  一、实现方法 v-8{mK`9\  
([|^3tM  
  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: ~;-2eKw  
0eKLp8;Lh  
#pragma data_seg("shareddata") ~Y{]yBGoF  
HHOOK hHook =NULL; //钩子句柄 PbY.8d%2/k  
UINT nHookCount =0; //挂接的程序数目 nTw:BU4jd  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 >Hmho'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 me F.  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey y<~(}xsHh  
static int KeyCount =0; X40JCQx{+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1;?w#/&t  
#pragma data_seg() oGyoU#z#  
}8ESp3~e_  
  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。 _+)n}Se  
mKE' l'9A_  
  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: RameaFX8  
Unansk  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR dNCd-ep  
cKey,UCHAR cMask) aO}p"-'  
{ mI\[L2x  
 BOOL bAdded=FALSE; :?}> Q  
 for(int index=0;index<MAX_KEY;index++){ `9k\~D=D~  
  if(hCallWnd[index]==0){ ,$aqF<+;  
   hCallWnd[index]=hWnd; T24$lhM  
   HotKey[index]=cKey; 1NG[   
   HotKeyMask[index]=cMask; I*f@M}  
   bAdded=TRUE; eL'fJcjw<  
   KeyCount++; Dw 5Ze  
   break; fB&i{_J  
  } zsj]WP6 j  
 } z =\ENG|x#  
 return bAdded; VZe'6?#  
} DZ $O%  
//删除热键 kyZZ0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |MN2v[y  
{ qG2P?DR  
 BOOL bRemoved=FALSE; _,v>P2)  
 for(int index=0;index<MAX_KEY;index++){ 9. ,IqnP  
  if(hCallWnd[index]==hWnd){ @$CPTv3e  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ KZ1m 2R}'  
    hCallWnd[index]=NULL; *v: .]_;  
    HotKey[index]=0; r[^O 7  
    HotKeyMask[index]=0; 8M,z#DF  
    bRemoved=TRUE; ~eS/gF?  
    KeyCount--; a2]>R<M  
    break; ILiOEwHS7F  
   } &h.?~Ri  
  } ]zj&U#{  
 } aI|X~b  
 return bRemoved; KU Mk:5 c  
} 1bDAi2 H  
&LG|YvMY6  
eYn/F~5-  
  DLL中的钩子函数如下: wzmQRn;s  
>I0 a$w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) O2f-{jnTz,  
{ }jP/XO1f  
 BOOL bProcessed=FALSE; @7;}6,)  
 if(HC_ACTION==nCode) Q'hs,t1<  
 { |eFaOL|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ~$rSy|19  
   switch(wParam) ynf!1!4  
   {  &OkPO|  
    case VK_MENU: _PQk<QZ  
     MaskBits&=~ALTBIT; |VjD. ]I  
     break; 5/T#>l<  
    case VK_CONTROL: &T ^bv*P  
     MaskBits&=~CTRLBIT; % .ss  
     break; '|*e4n  
    case VK_SHIFT: E70o nR!i  
     MaskBits&=~SHIFTBIT; b_u; `^  
     break; K|Xe)  
    default: //judge the key and send message -s7!:MB%g  
     break; U-$nwji  
   } #;+SAoN  
   for(int index=0;index<MAX_KEY;index++){ 91nB?8ZE6,  
    if(hCallWnd[index]==NULL) yn20*ix{  
     continue; *y` (^kyS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cxFyN ;7  
    { 6\v4#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )T&r770  
     bProcessed=TRUE; 2z AxGX  
    } ;!7M<T$&  
   } Mhb~wDQl  
  } k9NHdi7&2  
  else if((lParam&0xc000ffff)==1){ //有键按下 <xrya _R?  
   switch(wParam) s;[=B  
   { X`-o0HG  
    case VK_MENU: bb+iUV|Do  
     MaskBits|=ALTBIT; f]C^{Uk#  
     break; *o!#5c  
    case VK_CONTROL: p;D {?H/  
     MaskBits|=CTRLBIT; !/! Fc'A  
     break; E8wkqZN  
    case VK_SHIFT: SLH;iqPT  
     MaskBits|=SHIFTBIT; ^>eV}I5ak  
     break; u6:$AA  
    default: //judge the key and send message +1\t 0P24  
     break; m,6[;  
   } fEt BodA)  
   for(int index=0;index<MAX_KEY;index++){ L. S/Mv  
    if(hCallWnd[index]==NULL) o{l]n*  
     continue; ^gY'^2bzxu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Df]*S  
    { oh9L2"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >7 cDfv"  
     bProcessed=TRUE; .ezZ+@LI+#  
    } _fHj8- s/  
   } ;E!] /oY<  
  } ER}5`*X{  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 %WX^']p  
   for(int index=0;index<MAX_KEY;index++){ Id>I.e4  
    if(hCallWnd[index]==NULL) Kw:%B|B<T  
     continue; /1bQ RI^\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5Q8s{WQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )t:8;;W@Ir  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2r]o>X  
   } Ysw&J}6e  
  } sv#b5,>9  
 } s"2+H}u   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); WY5HmNX3E  
} i'1 MZ%.  
TQ%F\@"  
  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: %ZDO0P !/  
sWKdqs  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =8"xQ>D62  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r029E-  
^7t1'A8e<  
  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: */|<5X;xIA  
o!c~"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 'TA !JB+  
{ m6A\R KJ'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6 .[3N~pq  
 { HXPq+  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 R+=wSG]  
  SaveBmp(); YTr+"\CkA  
  return FALSE; $' ::51  
 } 4AF.KX7  
 …… //其它处理及默认处理 nV8iYBBym  
} ,s:viXk  
h}DKFrHW;-  
S&D8Rao5  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 x`2du/ C  
SDk^fTV8x  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 {M\n  
,#%I$  
  二、编程步骤 l|;]"&|_]c  
%J9+`uSl  
  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"; _?eT[!oO8  
aB`jFp-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; kE[R9RS!  
WYkh'sv >  
  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; $H&:R&Us  
A!}Ps"Z  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ::-*~CH)  
fP$rOJ)P  
  5、 添加代码,编译运行程序。 ;Sp/N4+  
H6/gRv@  
三、程序代码 (CJx Y(1K  
A5_r(Z-5  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL o*oFCR]j  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) .kgt? r  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ X!@ Y ,  
#if _MSC_VER > 1000 k]2_vk^  
#pragma once MN:LL <  
#endif // _MSC_VER > 1000 +wI<w|!  
#ifndef __AFXWIN_H__ 'q@vTM'-  
#error include 'stdafx.h' before including this file for PCH Q-1 Xgw!  
#endif aY6F4,7/B  
#include "resource.h" // main symbols *55unc  
class CHookApp : public CWinApp n8`WU3&  
{ D#^euNiWd  
 public: e_cK#9+  
  CHookApp(); BKgCuz:y  
  // Overrides &)_ z!  
  // ClassWizard generated virtual function overrides 1y,/|Y  
  //{{AFX_VIRTUAL(CHookApp) 3UUN@Tx  
 public: >gz8,&  
  virtual BOOL InitInstance(); P'*Fd3B#A=  
  virtual int ExitInstance(); uH[:R vC0  
  //}}AFX_VIRTUAL 7 y$a=+D i  
  //{{AFX_MSG(CHookApp) J@#rOOu  
  // NOTE - the ClassWizard will add and remove member functions here. @Qp#Tg<'  
  // DO NOT EDIT what you see in these blocks of generated code ! Gi*_ &  
  //}}AFX_MSG Hxleh><c-  
  DECLARE_MESSAGE_MAP() 7<Y aw,G  
}; =F %lx[9Ye  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); rd)W+W9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u1\r:q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *M$'dLn  
BOOL InitHotkey(); < Pi#-r.,  
BOOL UnInit(); SDVnyT  
#endif 'E\4/0 !  
su3Wk,MLP  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. xJA{Hws  
#include "stdafx.h" rZE+B25T~  
#include "hook.h" Lu5X~6j"$  
#include <windowsx.h> g}L>k}I?!W  
#ifdef _DEBUG (A "yE4rYK  
#define new DEBUG_NEW l kyK  
#undef THIS_FILE Aq\K N.  
static char THIS_FILE[] = __FILE__; Ch:EL-L  
#endif MV07RjeS  
#define MAX_KEY 100 G&"O)$h  
#define CTRLBIT 0x04 q;7DH4;t  
#define ALTBIT 0x02 }]JHY P\  
#define SHIFTBIT 0x01 aM(x--UR=  
#pragma data_seg("shareddata") DKkilqVM  
HHOOK hHook =NULL; :T<5Tq*+x  
UINT nHookCount =0; {<?8Y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey .N`*jT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT T)',}=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 9Hd_sNUu\  
static int KeyCount =0; y*p02\)  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift E=`/}2  
#pragma data_seg() c5: X$k\  
HINSTANCE hins; 9PMIF9"   
void VerifyWindow(); |--Jd$ dj  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ''3I0X*!  
//{{AFX_MSG_MAP(CHookApp) q%dbx:y#  
// NOTE - the ClassWizard will add and remove mapping macros here. ?-)v{4{s  
// DO NOT EDIT what you see in these blocks of generated code! [1O{yPV3s  
//}}AFX_MSG_MAP X; 6=WqJj  
END_MESSAGE_MAP() ?GW}:'z  
;~'&m  
CHookApp::CHookApp() W!Fc60>p@f  
{ 6Rmdf>a  
 // TODO: add construction code here, @PctBS<s  
 // Place all significant initialization in InitInstance (NN;1{DB8  
} RgZ9ZrE\  
S5d  
CHookApp theApp; \f)GW$`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1l Cr?  
{ W+$G{XSr5C  
 BOOL bProcessed=FALSE; =%c\<<]aV  
 if(HC_ACTION==nCode) PC|ul{[*}  
 { \-f/\P/ w  
  if((lParam&0xc0000000)==0xc0000000){// Key up bZ``*{I/  
   switch(wParam) JYv<QsD  
   { PTqia!  
    case VK_MENU: / :6|)AW.{  
     MaskBits&=~ALTBIT; ]hoq!:>M1  
     break; e[0"x. gu  
    case VK_CONTROL: `csZ*$7  
     MaskBits&=~CTRLBIT; p@[ fZj  
     break; < fV][W  
    case VK_SHIFT: P(/eVD#v  
     MaskBits&=~SHIFTBIT; J0oeCb  
     break; +-,iC6kK  
    default: //judge the key and send message `uH7~ r^  
     break; euVj,m  
   } kX8NRPW  
   for(int index=0;index<MAX_KEY;index++){ iq[IZdza  
    if(hCallWnd[index]==NULL) |(.%`BTD  
     continue; OA(.&5]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P,9Pn)M|  
    { x":o*(rSQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); N/--6)5~0  
     bProcessed=TRUE; T[#q0bv  
    } y%spI/(  
   } n?;rWq"  
  } xu%eg]  
  else if((lParam&0xc000ffff)==1){ //Key down  K[LuvS  
   switch(wParam) )nFyHAy-  
   { >P&1or)e%  
    case VK_MENU: 1@JusS0^K  
     MaskBits|=ALTBIT; 8ZLHN',  
     break; xV 2C4K  
    case VK_CONTROL: qZ&~&f|>e  
     MaskBits|=CTRLBIT; MU(I#Prpe  
     break; egURRC!  
    case VK_SHIFT: D W^Zuu/)  
     MaskBits|=SHIFTBIT; c+ByEP4EG  
     break; :7mHPe }(  
    default: //judge the key and send message 14jN0\  
     break; !?/:p.  
   } :9Jy/7/  
   for(int index=0;index<MAX_KEY;index++) /zoy,t-i  
   { ??U/Qi180  
    if(hCallWnd[index]==NULL) cD}]4  
     continue; H-U_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X2rKH$<g  
    { ] _5b   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3 yy5 l!fv  
     bProcessed=TRUE; 7(N+'8  
    } <aDZ{T%  
   } G\TO ]c  
  } %^vT7c>  
  if(!bProcessed){ I[d<SHo  
   for(int index=0;index<MAX_KEY;index++){ ]JV'z<  
    if(hCallWnd[index]==NULL) ]bY]YNt{7]  
     continue; F= %A9b_a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?Ve I lD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); GNe^ ~  
   } Y)+q[MZ R  
  } XWyP'\  
 } \Z&Nd;o   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); l $"hhI8  
} $2?j2}M  
IA({RE  
BOOL InitHotkey() mbGma  
{ P(TBFu  
 if(hHook!=NULL){ XclTyUGoK+  
  nHookCount++; ;}"Eqq:  
  return TRUE; aR/?YKA  
 } \r[u>7I  
 else =R|XFZ,  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Y`Io}h G$  
  if(hHook!=NULL) vIbM@Y4 '?  
   nHookCount++; i >s  
  return (hHook!=NULL); P <+0sh  
} ZcQu9XDIt  
BOOL UnInit() va'F '|  
{ e)g &q'O  
 if(nHookCount>1){ n=vDEX:'  
  nHookCount--; $ VP1(C  
  return TRUE; hW< v5!,  
 } G7Sw\wW  
 BOOL unhooked = UnhookWindowsHookEx(hHook); "cPg_-n  
 if(unhooked==TRUE){ z+yIP ?s}(  
  nHookCount=0; u0 t lf  
  hHook=NULL; gJ'pwSA  
 } @ 2)nhW/z6  
 return unhooked; %dFJ'[jDL  
} 4]ni-u0*  
E<[ s+iX  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }|Mwv $`  
{ f,KB BBbG  
 BOOL bAdded=FALSE; cN8Fn4gq  
 for(int index=0;index<MAX_KEY;index++){ Z,A$h>Z  
  if(hCallWnd[index]==0){ dQ.#8o=  
   hCallWnd[index]=hWnd; UI+6\ 3  
   HotKey[index]=cKey; t'l4$}(  
   HotKeyMask[index]=cMask; MmR6V#@:  
   bAdded=TRUE; ]f0'YLG  
   KeyCount++; .Dr!\.hL  
   break; _y_}/  
  } {YzCgf  
 } f 7lj,GAZ  
 return bAdded; yXJ25Axb  
} MMs~f*  
.4)oZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !S#3mT-  
{ nQjpJ /=  
 BOOL bRemoved=FALSE; '\tI|  
 for(int index=0;index<MAX_KEY;index++){ og5VB  
  if(hCallWnd[index]==hWnd){ )hXTgUZa  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Gl1XRNy C  
    hCallWnd[index]=NULL; *;Mi/^pzK  
    HotKey[index]=0; o8 JOpD  
    HotKeyMask[index]=0; < $0is:]  
    bRemoved=TRUE; 4a+gM._+O  
    KeyCount--; b-sN#'TDg  
    break; dm4Q'u  
   } ` 3qf}=Z`  
  } <m]0!ii  
 } d-D,Gx]>$  
 return bRemoved; H@=oVyn/  
} ZH_$Q$9  
1^![8>u"  
void VerifyWindow() ,PTM'O@aU#  
{ w`)5(~b  
 for(int i=0;i<MAX_KEY;i++){ Mw/9DrE7/  
  if(hCallWnd!=NULL){ `$B?TNuch7  
   if(!IsWindow(hCallWnd)){ %N*[{j= ^  
    hCallWnd=NULL; i[!|0U`p  
    HotKey=0; J rx^  
    HotKeyMask=0; )8@-  
    KeyCount--; $nO~A7  
   } mH&7{2r  
  } r ;RYGLx  
 } 4,I,f>V  
} c>_ti+  
)S g6B;CJ  
BOOL CHookApp::InitInstance() D_DwP$wSo  
{ ub-3/T  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [a2]_]E%  
 hins=AfxGetInstanceHandle(); ""0 Y^M2I  
 InitHotkey(); Rql/@j`JX  
 return CWinApp::InitInstance(); ga 5Q  
} 9\_AB.Z:  
/?'~`4!(  
int CHookApp::ExitInstance() ("2X8(3z  
{ M:/NW-:  
 VerifyWindow(); {EoYU\x  
 UnInit(); .Vbd-jr'M  
 return CWinApp::ExitInstance(); n1."Qix0  
} u7L?9  
.\R9tt}  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file mWT+15\5r(  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) o5o myMN  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ P%aqY~yF3  
#if _MSC_VER > 1000 xsZG(Tz  
#pragma once x77L"5g  
#endif // _MSC_VER > 1000 2/&=:,"t,B  
# )y`Zz{h  
class CCaptureDlg : public CDialog K81X32Lm'  
{ d`^3fr'.4A  
 // Construction o08WC'bX  
 public: |g&V? lI  
  BOOL bTray; Lv%3 jj  
  BOOL bRegistered; {N4 'g_  
  BOOL RegisterHotkey(); 4z0gyCAC A  
  UCHAR cKey; >n"0>[:4  
  UCHAR cMask; Nn LK!Q  
  void DeleteIcon(); [ohLG_9  
  void AddIcon(); FS1\`#Bm)  
  UINT nCount; 0cS$S Mn{  
  void SaveBmp(); U>2KjZB  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9 C[~*,qx  
  // Dialog Data Nk7y2[  
  //{{AFX_DATA(CCaptureDlg) NUV">i.(  
  enum { IDD = IDD_CAPTURE_DIALOG }; n n7LL+h  
  CComboBox m_Key; Q,KNZxT,q  
  BOOL m_bControl; 6!\V|  
  BOOL m_bAlt; .-Lrrk)R+  
  BOOL m_bShift; >v+1 v  
  CString m_Path; a !VWWUTm?  
  CString m_Number; 0/R;g~q@  
  //}}AFX_DATA |a{; <a  
  // ClassWizard generated virtual function overrides Nny*C`uDF  
  //{{AFX_VIRTUAL(CCaptureDlg) ;ElCWs->\  
 public: W=+n |1  
  virtual BOOL PreTranslateMessage(MSG* pMsg); hVz yvpw  
 protected: @_ %RQO_X  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cMY}Y [2c  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); rN}pi@  
  //}}AFX_VIRTUAL & kC  
  // Implementation /~NX<Ye&  
 protected: A6z ,6v6  
  HICON m_hIcon; (47?lw &  
  // Generated message map functions 4Zbn8GpC  
  //{{AFX_MSG(CCaptureDlg) {=GmXd%D  
  virtual BOOL OnInitDialog(); !Cr3>tA  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); :^)?AO#J  
  afx_msg void OnPaint(); |+ F ~zIu'  
  afx_msg HCURSOR OnQueryDragIcon(); 1#d2 +J*  
  virtual void OnCancel(); /e2zH  
  afx_msg void OnAbout(); \ S;[7T  
  afx_msg void OnBrowse(); $JY \q2  
  afx_msg void OnChange(); OJ&'Z}LB  
 //}}AFX_MSG w;O-ATUzN  
 DECLARE_MESSAGE_MAP() jFN0xGZ  
}; #]}Ii{1?Y  
#endif *Jsb~wta  
h#YO;m2wd  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file <x}wy+SG  
#include "stdafx.h" !n-Sh<8  
#include "Capture.h" KhR3$|fH<  
#include "CaptureDlg.h" ",/6bs#$  
#include <windowsx.h> 4S26TgY  
#pragma comment(lib,"hook.lib") AG,><UP  
#ifdef _DEBUG F$t]JM  
#define new DEBUG_NEW k4q":}M  
#undef THIS_FILE @[r[l#4yUi  
static char THIS_FILE[] = __FILE__; #*iUZo  
#endif >$m<R &  
#define IDM_SHELL WM_USER+1 VIF43/>(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U"Gx Xrl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p<L7qwOii  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; B?j t?  
class CAboutDlg : public CDialog 1M`E.Ztw*  
{ Ch"wp/[  
 public: Ow;thNN  
  CAboutDlg(); S^%3Vf}  
  // Dialog Data 8eB,$;i  
  //{{AFX_DATA(CAboutDlg) kkl'D!z2g  
  enum { IDD = IDD_ABOUTBOX }; JBpV'_"]  
  //}}AFX_DATA $mJv\;t  
  // ClassWizard generated virtual function overrides {!2K-7;  
  //{{AFX_VIRTUAL(CAboutDlg) rUKg<]&@  
 protected: Biv)s@"f-Q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support q1rj!7  
  //}}AFX_VIRTUAL 7i"b\{5  
  // Implementation V(`]hH0;T  
 protected: _# {*I(l  
  //{{AFX_MSG(CAboutDlg) c6:uM1V{  
  //}}AFX_MSG IHEbT   
  DECLARE_MESSAGE_MAP() XUP{]w`.Z  
}; xa)p ,  
=;Q/bD->  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $z$^ yjL  
{ $@Vn+| Ix  
 //{{AFX_DATA_INIT(CAboutDlg) yY8zTWji_  
 //}}AFX_DATA_INIT Qz@_"wm[  
} KYiJXE[Q-  
EDnNS  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) z6`0Uv~  
{ &2W"4SE]6  
 CDialog::DoDataExchange(pDX); V?EX`2S  
 //{{AFX_DATA_MAP(CAboutDlg) mu\1hKq;B  
 //}}AFX_DATA_MAP UwUHB~<oE  
} F~Dof({:  
GQ1/pys  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) e=&~6bs1U  
 //{{AFX_MSG_MAP(CAboutDlg) ~xqiasE#K  
 // No message handlers ~v8X>XDL?T  
 //}}AFX_MSG_MAP  xL15uWk-  
END_MESSAGE_MAP() *O[/KR%  
B?B OAH  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |^1g*f y?  
: CDialog(CCaptureDlg::IDD, pParent) qm_l# u6  
{ rO#w(]   
 //{{AFX_DATA_INIT(CCaptureDlg) d[6 'w ?  
  m_bControl = FALSE; D9+qT<ojN  
  m_bAlt = FALSE; WaB0?jI  
  m_bShift = FALSE; r)gK5Mv  
  m_Path = _T("c:\\"); XZ%[;[  
  m_Number = _T("0 picture captured."); icb)JZ1K  
  nCount=0; 4M&$wi  
  bRegistered=FALSE; a#]V|1*O  
  bTray=FALSE; ~\am%r>  
 //}}AFX_DATA_INIT CU|E-XPW  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ?>;b,^4  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); gGP6"|tc4  
} %Yu~56c-  
"6d0j)YO  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) nXn@|J&z~U  
{ 3(oMASf  
 CDialog::DoDataExchange(pDX); AFi_P\X  
 //{{AFX_DATA_MAP(CCaptureDlg) J$6WUz:?  
  DDX_Control(pDX, IDC_KEY, m_Key); 1 *' /B  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); g|Lbe4?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); W.^zN'a  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); *)RKU),3nL  
  DDX_Text(pDX, IDC_PATH, m_Path); >N#Nz 0|(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); {@2+oOuYfN  
 //}}AFX_DATA_MAP MFROAVPZ5  
} #e@NV4q  
#QFz /6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9\EW~OgTu  
//{{AFX_MSG_MAP(CCaptureDlg) pFH.beY  
 ON_WM_SYSCOMMAND() e%e.|+  
 ON_WM_PAINT() L;0 NR(b!  
 ON_WM_QUERYDRAGICON() yBy7d!@2  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) tU?BR<q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) U,!qNi}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ]EHsRd  
//}}AFX_MSG_MAP q0 }u%Yz  
END_MESSAGE_MAP() =@d#@  
CcUF)$kz  
BOOL CCaptureDlg::OnInitDialog() 8gavcsVE[  
{ 0U7Gl9~  
 CDialog::OnInitDialog(); 'd2 :a2C]  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }W^@mi  
 ASSERT(IDM_ABOUTBOX < 0xF000); B& @ pZYl  
 CMenu* pSysMenu = GetSystemMenu(FALSE); :6o%x0l  
 if (pSysMenu != NULL) g?80>-!bF  
 {  D_dv8  
  CString strAboutMenu; ,a&,R*r@&  
  strAboutMenu.LoadString(IDS_ABOUTBOX); +(= -95qZ  
  if (!strAboutMenu.IsEmpty()) poAJl;T  
  { (d#&m+ g]  
   pSysMenu->AppendMenu(MF_SEPARATOR); ry|a_3X(I  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); XMS:F]HN  
  } rQl9SUs  
 } d0B`5#4  
 SetIcon(m_hIcon, TRUE); // Set big icon bit|L7*14  
 SetIcon(m_hIcon, FALSE); // Set small icon R[zN?  
 m_Key.SetCurSel(0); ueJ^Q,-t  
 RegisterHotkey(); Ug+ K:YUq  
 CMenu* pMenu=GetSystemMenu(FALSE); /wEl\Kx  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]){ZL  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); F'|K>!H  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); rA ={;`  
 return TRUE; // return TRUE unless you set the focus to a control se.HA  
} 2V]a+Cgk  
\i+AMduAo  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) by+xK~>  
{ LilK6K  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) B:X%k/{  
 { S"*k#ao  
  CAboutDlg dlgAbout; sg=G<50i  
  dlgAbout.DoModal(); xxs +=.2  
 } %l8!p'a  
 else Pd+*syOM  
 { ^ oav-R&  
  CDialog::OnSysCommand(nID, lParam); z00X ?F  
 } ~IYR&GEaUG  
} VHPqEaR  
eGT&&Y  
void CCaptureDlg::OnPaint() kBqgz| jE%  
{ ^1~lnD~0  
 if (IsIconic()) b_`h2dUq  
 { r^6@Zwox]  
  CPaintDC dc(this); // device context for painting k.b=EX|  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9ye!kYF,  
  // Center icon in client rectangle \FfqIc9;  
  int cxIcon = GetSystemMetrics(SM_CXICON); +@]k[9  
  int cyIcon = GetSystemMetrics(SM_CYICON); :xHKbWz6j  
  CRect rect; 4AzDWK@/  
  GetClientRect(&rect); |$ ^3 5F  
  int x = (rect.Width() - cxIcon + 1) / 2; AS]8rH  
  int y = (rect.Height() - cyIcon + 1) / 2; ;`/a. /bc  
  // Draw the icon a>l,H#w*vW  
  dc.DrawIcon(x, y, m_hIcon); Tv1oy%dK  
 } s<LnUF1b  
 else x"sbm  
 { Dl.UbH }=  
  CDialog::OnPaint(); a& 0g0n6  
 } pq r_{  
} c BqbbZyUk  
/:]<z6R  
HCURSOR CCaptureDlg::OnQueryDragIcon() U\Y0v.11  
{ L+G0/G}O\  
 return (HCURSOR) m_hIcon;  OLIMgc(W  
} 842v^ 2  
QDW,e]A  
void CCaptureDlg::OnCancel() TgjjwcO Y  
{ Q3%]  
 if(bTray) k={1zl ;  
  DeleteIcon(); QuEX|h,F  
  CDialog::OnCancel(); C9?mxa*z  
} EVLL,x.~:z  
w0;4O)H$O  
void CCaptureDlg::OnAbout() ;`^_9 K  
{ x2t&Wpvt  
 CAboutDlg dlg; /&|p7  
 dlg.DoModal(); . q -: 3b  
} 3 1c*^ZE.  
U2?R&c;b  
void CCaptureDlg::OnBrowse() I4%kYp]  
{ [K,P)V>K  
 CString str; }F0<8L6%  
 BROWSEINFO bi; =r/8~~=  
 char name[MAX_PATH]; lTu& 9)  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ?\8  
 bi.hwndOwner=GetSafeHwnd(); I5E =Ujc_  
 bi.pszDisplayName=name; 4Cu\|"5)  
 bi.lpszTitle="Select folder"; d:|x e:  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; C{$iuus0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); PX/Y?DP  
 if(idl==NULL) R~iv%+  
  return; L7{}`O/g7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); IV!`~\@  
 str.ReleaseBuffer(); 9#7W+9  
 m_Path=str; yYGs] +  
 if(str.GetAt(str.GetLength()-1)!='\\') #<==7X#  
  m_Path+="\\"; O$r/ {{I.  
 UpdateData(FALSE); n= 4  
} FS=yc.Q_  
xi{ r-D8Z  
void CCaptureDlg::SaveBmp() niCK(&z  
{ 2DPv7\fW  
 CDC dc; RHBQgD$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); &-qQF`7  
 CBitmap bm; m W>Iib|  
 int Width=GetSystemMetrics(SM_CXSCREEN); i,^3aZwJ'  
 int Height=GetSystemMetrics(SM_CYSCREEN); sM MtU@<x  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #S9J9k  
 CDC tdc; czIAx1R9  
 tdc.CreateCompatibleDC(&dc); [m{sl(Q  
 CBitmap*pOld=tdc.SelectObject(&bm); %m dtVQ@  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); J;Z2<x/H  
 tdc.SelectObject(pOld); b MD|  
 BITMAP btm; g(tVghHxt$  
 bm.GetBitmap(&btm); M1WD^?tKQ.  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; z]rr Q=dAA  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); m-azd ~r[  
 BITMAPINFOHEADER bih; ]w>o=<?b  
 bih.biBitCount=btm.bmBitsPixel; ]i(/T$?~  
 bih.biClrImportant=0; 4@{?4k-cq  
 bih.biClrUsed=0; tnnGM,"ol  
 bih.biCompression=0; vTx>z\7q,  
 bih.biHeight=btm.bmHeight; SWx: -<  
 bih.biPlanes=1; nl 'MWP  
 bih.biSize=sizeof(BITMAPINFOHEADER); v.<mrI#?  
 bih.biSizeImage=size; hT1JEu  
 bih.biWidth=btm.bmWidth; FfM^2`xP  
 bih.biXPelsPerMeter=0; MZ$uWm`/  
 bih.biYPelsPerMeter=0; 5C1EdQ4S0  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Wgh@XB  
 static int filecount=0; WtZI1`\qe  
 CString name; 1N(1h D  
 name.Format("pict%04d.bmp",filecount++); 5z 0VMt  
 name=m_Path+name; G`n $A/9Q  
 BITMAPFILEHEADER bfh; -O\i^?lD;  
 bfh.bfReserved1=bfh.bfReserved2=0; 8 5ET$YV  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Rs5lL-I  
 bfh.bfSize=54+size; \X&8EW  
 bfh.bfOffBits=54; z mip  
 CFile bf; 4zS0kk;+  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =[]6NjKS,  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ciODTq?  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }r@dZ Bp:  
  bf.WriteHuge(lpData,size); E>]K#H  
  bf.Close(); ]Ac}+?  
  nCount++; zsJ# CDm  
 } p" >*WQ   
 GlobalFreePtr(lpData); "."(<c/3  
 if(nCount==1) 0)Ephsw  
  m_Number.Format("%d picture captured.",nCount); !Nx1I  
 else SC~k4&xy  
  m_Number.Format("%d pictures captured.",nCount); ?v M9 !  
  UpdateData(FALSE); ecs 0iW-,  
} +`GtZnt#  
3:nBl?G<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) %\<b{x# G  
{ kd^H}k  
 if(pMsg -> message == WM_KEYDOWN) B ktRA  
 { SdYf^@%}F  
  if(pMsg -> wParam == VK_ESCAPE) ]7Vg9&1`  
   return TRUE; ;9OhK71}  
  if(pMsg -> wParam == VK_RETURN) TC/c5:)]  
   return TRUE; x ']'ODs  
 } )  FR7t  
 return CDialog::PreTranslateMessage(pMsg); ]w6Q?%'9  
} =^u;uS[IW  
{V6pC  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) G~<UP(G  
{ GA gTy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ q5R| ^uf  
  SaveBmp(); }?9&xVh?\  
  return FALSE; ZEI,9`t!  
} Q"qI'*Kgt  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 6E}9uwQ  
 CMenu pop; wv3,% lN  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); oVy{~D=  
 CMenu*pMenu=pop.GetSubMenu(0); 0h@FHw2d  
 pMenu->SetDefaultItem(ID_EXITICON); V,_m>$Mo  
 CPoint pt; 5&n{QE?Um  
 GetCursorPos(&pt); OtqFI!ns  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {3`385  
 if(id==ID_EXITICON) 4=tR_s  
  DeleteIcon(); 'vBZh1`p  
 else if(id==ID_EXIT) :_R:>n9 p  
  OnCancel(); Os"('@jd>  
 return FALSE; 2DCQ5XewYe  
} PoF3fy%.  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); h`|04Q  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) sWYnoRxu  
 AddIcon(); TsTc3  
 return res; b4_0XmL  
} w2nReB z  
\2s`mCY  
void CCaptureDlg::AddIcon() [Iks8ZWr_  
{ O6;"cUv  
 NOTIFYICONDATA data; tON>wmN  
 data.cbSize=sizeof(NOTIFYICONDATA); sFFQ]ST2p  
 CString tip; a<G&}|6  
 tip.LoadString(IDS_ICONTIP); <:&vAX L  
 data.hIcon=GetIcon(0); 2cYBm^o|x  
 data.hWnd=GetSafeHwnd(); i 6G40!G=)  
 strcpy(data.szTip,tip); _!',%  +  
 data.uCallbackMessage=IDM_SHELL; YqX$a~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; C.jWT1  
 data.uID=98; f,HUr% @  
 Shell_NotifyIcon(NIM_ADD,&data); sApix=Lr  
 ShowWindow(SW_HIDE); =hKAwk/^  
 bTray=TRUE; rR.It,,  
} B'}?cG]  
p)IL(_X)  
void CCaptureDlg::DeleteIcon() y>a?<*Y+e  
{ FRd"F$U  
 NOTIFYICONDATA data; ^AP8T8v  
 data.cbSize=sizeof(NOTIFYICONDATA); X .t4;  
 data.hWnd=GetSafeHwnd(); aZA ``#p+  
 data.uID=98; ]1!" q40)]  
 Shell_NotifyIcon(NIM_DELETE,&data); 3%Y:+%VE  
 ShowWindow(SW_SHOW); @z@%vr=vX  
 SetForegroundWindow(); qE~_}4\Z9  
 ShowWindow(SW_SHOWNORMAL); y+(\:;y$7  
 bTray=FALSE; eQbHf  
} +Y%6y]8  
y"q aa  
void CCaptureDlg::OnChange() qNEp3WY:  
{ "bo0O7InOV  
 RegisterHotkey(); o:@Q1+p  
} {6'X z  
L|'^P3#7`  
BOOL CCaptureDlg::RegisterHotkey() Z4] n<~o  
{ }g}Eh>U  
 UpdateData(); !a@)6or  
 UCHAR mask=0; [C "\]LiX  
 UCHAR key=0; w"^h<]b  
 if(m_bControl) 9"P|Csj  
  mask|=4; bx3Q$|M?  
 if(m_bAlt) X06Lr!-%  
  mask|=2; I_J&>}V'  
 if(m_bShift) [*',pG  
  mask|=1; BR2Gb~#T  
  key=Key_Table[m_Key.GetCurSel()]; po*G`b;v  
 if(bRegistered){ $m4-^=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); x)::^'74  
  bRegistered=FALSE; g@`i7qN  
 } c5YPV"X  
 cMask=mask; Q7s@,c!m_  
 cKey=key; W7>2&$  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +<7Oj s>o  
 return bRegistered; >d/H4;8  
} MYAt4cHc2  
OR <+y~Rv  
  四、小结 THYw_]K  
'.mepxf< f  
  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
温馨提示:欢迎交流讨论,请勿纯表情、纯引用!
认证码:
验证问题:
10+5=?,请输入中文答案:十五