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
  • 5109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: Y5ZBP?P  
  Qi=pP/Y  
  一、实现方法 |j2$G~B6  
]/#3 P  
  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: yI{4h $c  
`o4%UkBpM  
#pragma data_seg("shareddata") ykS-5E`  
HHOOK hHook =NULL; //钩子句柄 .A Dik}o  
UINT nHookCount =0; //挂接的程序数目 *^3&Y@  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 JBI>D1`"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^XgBkC~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey gcA,u)z}R  
static int KeyCount =0;  "d; T1  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 9Ai 3p  
#pragma data_seg() CcJ%; .V,T  
I3.cy i  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Op_(10|  
3/{,}F$  
  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: j5:/Gl8  
4=nh' U38  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR >ufLRGL>  
cKey,UCHAR cMask) V[;^{,;  
{ u|+Dqe`  
 BOOL bAdded=FALSE; #rI4\K  
 for(int index=0;index<MAX_KEY;index++){ )p`zN=t  
  if(hCallWnd[index]==0){ <~bvf A=  
   hCallWnd[index]=hWnd; ;%Zu[G`C  
   HotKey[index]=cKey; Z#t}yC%^d  
   HotKeyMask[index]=cMask; o.g)[$M8cF  
   bAdded=TRUE; 01 <Ti"  
   KeyCount++; a7>^^?|  
   break; Wx`$hvdq  
  } Ln$= 8x^T  
 } grxlGS~Q  
 return bAdded; sTu]C +A  
} -NPX;e$<  
//删除热键 ="('  #o  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) GK`U<.[c  
{ Z [YSE T  
 BOOL bRemoved=FALSE; %BwvA_T'Q  
 for(int index=0;index<MAX_KEY;index++){ S }3?  
  if(hCallWnd[index]==hWnd){ c6Z"6-}$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ xUF5  
    hCallWnd[index]=NULL; B!x7oD9  
    HotKey[index]=0; 5h l!zA?  
    HotKeyMask[index]=0; #|QA_5  
    bRemoved=TRUE; j a'_syn  
    KeyCount--; <u}[_  
    break; E#~J"9k98  
   } Ly-}HW(  
  } AIG5a$}&  
 } gX~lYdA  
 return bRemoved; ?&JK q^9\I  
} }vEMG-sxX  
S=a>rnF  
&9ERlZ(A  
  DLL中的钩子函数如下: BC)1FxsGf  
bMB@${i}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^@ Xzh:  
{ `PtfPt<{  
 BOOL bProcessed=FALSE; Kut@z>SK  
 if(HC_ACTION==nCode) v[4-?7-  
 { G.~Ffk  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 SQ057V>'=  
   switch(wParam) 5 )z'=  
   {  6SF29[&  
    case VK_MENU: y-uSpW  
     MaskBits&=~ALTBIT; }E^k*S  
     break; !PfdY&.)  
    case VK_CONTROL: Y;{(?0 s  
     MaskBits&=~CTRLBIT; Ce:w^P+  
     break; $#-O^0D  
    case VK_SHIFT: Z_4|L+i<{  
     MaskBits&=~SHIFTBIT; avY<~-44B  
     break; .naSK`J,`  
    default: //judge the key and send message {XH3zMk[  
     break; k!V@Q!>,  
   } K2gF;(  
   for(int index=0;index<MAX_KEY;index++){ Q"QZ^!zRl  
    if(hCallWnd[index]==NULL) pwVaSnre`  
     continue; 39bw,lRPV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @2~;)*  
    { M Al4g+es  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); YRyaOrl$<  
     bProcessed=TRUE; skF}_  
    } fuT Bh6w&  
   } a(AYY<g  
  } /<k]mY cu  
  else if((lParam&0xc000ffff)==1){ //有键按下 m>f8RBp]'  
   switch(wParam) 0|| 5 r#  
   { 32p9(HQ  
    case VK_MENU: ,rX|_4 n*  
     MaskBits|=ALTBIT; ~Kt2g\BSok  
     break; 9vBW CCf  
    case VK_CONTROL: ,7)z avA  
     MaskBits|=CTRLBIT;  V*W H  
     break; [$@EQ]tt/  
    case VK_SHIFT: _Mi*Fvj  
     MaskBits|=SHIFTBIT; > .K  
     break; 'yR\%#s6  
    default: //judge the key and send message )  D5JA`  
     break; 3b/J  
   } SNC)cq+{  
   for(int index=0;index<MAX_KEY;index++){ :)F0~Q  
    if(hCallWnd[index]==NULL) '>GPk5Nq77  
     continue; Q[9W{l+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y?UB?2 VN  
    { RBpv40n0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); zFr#j~L"  
     bProcessed=TRUE; v}.~m)  
    } Lb~' I=9D  
   } U lPhW~F)  
  } X2`n&JE  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 C[CNJ66  
   for(int index=0;index<MAX_KEY;index++){ $ve*j=p  
    if(hCallWnd[index]==NULL) ft$!u-`  
     continue; A]MX^eY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) M4e8PRlI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,4r 4 <  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 0 *]ZC'pm  
   } G_ #MXFWt  
  } a&Me#H{  
 } }[y_Fr0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6('CB|ga  
} T2TWb  
jxZ_-1  
  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: }Vfc;2  
+&.39q !  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L0*f(H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C_&ZQlgQ  
K@?K4o   
  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: {a,U{YJ\H  
zqLOwzMlLx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {[bB$~7Eu  
{ v7<r- <I[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) t\O#5mo  
 { SmV}Wf  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 *t`=1Ioj  
  SaveBmp(); k/i&e~! \  
  return FALSE; xu@+b~C\  
 } vBV_aB1{  
 …… //其它处理及默认处理 Ah;`0Hz;  
} X.AE>fx*h  
hLaQ[9  
~BgNM O;|  
  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。 Fnuheb'&m  
#'I<q  
  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。 >vDi,qmZ  
])#?rRw  
  二、编程步骤 s6!! ty;Y  
fr&K^je\  
  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"; {5 (M   
vofBS   
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :H/Rhx=  
$PMD$c  
  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; bQHJ}aCi  
=<Ss&p>  
  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; Y ^5RM  
8 -9<r  
  5、 添加代码,编译运行程序。 B3p79 j  
GmZ2a-M  
三、程序代码 JykNEMB#  
%1 rN6A!%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ,qIut|C*  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) eIbz`|%3  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8COGe=+o  
#if _MSC_VER > 1000 >[<f\BN|  
#pragma once o`nJJ:Cxq-  
#endif // _MSC_VER > 1000 ]3 76F7  
#ifndef __AFXWIN_H__ X]s="^  
#error include 'stdafx.h' before including this file for PCH -ug -rdXV  
#endif D 1(9/;9  
#include "resource.h" // main symbols HFX,EE  
class CHookApp : public CWinApp o),@I#fM  
{ G#3$sz  
 public: Mr@{3do$  
  CHookApp(); c LfPSA  
  // Overrides E0eZal],  
  // ClassWizard generated virtual function overrides Dk}txw}#  
  //{{AFX_VIRTUAL(CHookApp) -Zqw[2Q4  
 public: c@$W]o"A  
  virtual BOOL InitInstance(); L"}2Y3  
  virtual int ExitInstance(); \cQ+9e)  
  //}}AFX_VIRTUAL bLO^5`6  
  //{{AFX_MSG(CHookApp) ?}No'E1!I  
  // NOTE - the ClassWizard will add and remove member functions here. ygxaT"3"=  
  // DO NOT EDIT what you see in these blocks of generated code ! RggO|s+0;  
  //}}AFX_MSG |&~);>Cq2  
  DECLARE_MESSAGE_MAP() wvH*<,8V q  
}; ' &Tz8.jp~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); n M `pnR_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uk3PoB^>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |%j7Es  
BOOL InitHotkey(); Nk?L<'  
BOOL UnInit(); ht*;,[ea  
#endif JQSczE3  
]T%wRd5&-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. /brHB @$  
#include "stdafx.h" 'Ecd\p  
#include "hook.h" y7LM}dH#m  
#include <windowsx.h> ~uuM0POo  
#ifdef _DEBUG ZSn6JV'g  
#define new DEBUG_NEW A6#v6iT  
#undef THIS_FILE DS7Pioa86  
static char THIS_FILE[] = __FILE__; J74kK#uF=  
#endif R".*dC,0'B  
#define MAX_KEY 100 [k=LX+w@  
#define CTRLBIT 0x04 ,9W!cD+0  
#define ALTBIT 0x02 .19_EQ>+  
#define SHIFTBIT 0x01 rrl{3 ?  
#pragma data_seg("shareddata") D;Y2yc[v  
HHOOK hHook =NULL; hmv*IF.  
UINT nHookCount =0; D\  P-|}  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  sM9NHwg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT sd |c/ayh~  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Q'rX]kk_  
static int KeyCount =0; W1[C/dDc  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift sX(rJLbD  
#pragma data_seg() }LX.gm  
HINSTANCE hins; FwDEYG  
void VerifyWindow(); .FvIT] k-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) IDp2#qg_  
//{{AFX_MSG_MAP(CHookApp) hlHle\[ds  
// NOTE - the ClassWizard will add and remove mapping macros here. o6 8;-b'n  
// DO NOT EDIT what you see in these blocks of generated code! \ZC0bHsA  
//}}AFX_MSG_MAP hho\e 8  
END_MESSAGE_MAP() /re0"!0y  
Jg@eGs\*  
CHookApp::CHookApp() ORt)sn&~d  
{ Fb^,%K:  
 // TODO: add construction code here, 8CRwHDB  
 // Place all significant initialization in InitInstance F ZfhiIf  
} ^Fwdi#g  
8%;]]{(B  
CHookApp theApp; h[gKyxZ/t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) &usum~@  
{ 9iGp0_J  
 BOOL bProcessed=FALSE; 3MoVIf1  
 if(HC_ACTION==nCode) yXro6u?rC  
 { r?WOum  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8VMD304  
   switch(wParam) "O%xQ N  
   { p:Zhg{sF  
    case VK_MENU: u7 {R; QKw  
     MaskBits&=~ALTBIT; KvlLcE~`o  
     break; vH{JLN2  
    case VK_CONTROL: V4|l7  
     MaskBits&=~CTRLBIT; IKnXtydeI}  
     break; qhNYQ/uS  
    case VK_SHIFT: /z4n?&tM  
     MaskBits&=~SHIFTBIT; 8[u$CTl7a  
     break; m"vWu0/#  
    default: //judge the key and send message uD4$<rSHb  
     break; l6-%)6u>  
   } j8?rMD~  
   for(int index=0;index<MAX_KEY;index++){ Ki%RSW(_`  
    if(hCallWnd[index]==NULL) OZno 3Hn  
     continue; xOc&n0}%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zC!Pb{IaH  
    { N)X51;+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,>3|\4/Q  
     bProcessed=TRUE; =Ka :i>  
    } } BnPNc[I  
   } XI5q>cd\Sz  
  } e;&fO[ 2  
  else if((lParam&0xc000ffff)==1){ //Key down (&qjY I  
   switch(wParam) I>@Qfc bG  
   { t ZA%^Y  
    case VK_MENU: [?F]S:/i  
     MaskBits|=ALTBIT; z5t"o !  
     break; - s0QEQ  
    case VK_CONTROL: ;})s o  
     MaskBits|=CTRLBIT; &MGM9 zm-]  
     break; g;!,2,De}  
    case VK_SHIFT: L_fiE3G|>  
     MaskBits|=SHIFTBIT; /Xw wB  
     break; nY_+V{F  
    default: //judge the key and send message >\>!Q V1@  
     break; k E-+#p  
   } RGLi#:0_.x  
   for(int index=0;index<MAX_KEY;index++) c 4L++ u#  
   { CDWchY  
    if(hCallWnd[index]==NULL) 3mXRLx=0>  
     continue; oY7 eVuz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +'9eo%3O  
    { 6g'+1%O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 'h;x>r  
     bProcessed=TRUE; ]PZ\N~T  
    } .q9i10C  
   } F vHd `  
  } T :X A  
  if(!bProcessed){ hi9@U]H#  
   for(int index=0;index<MAX_KEY;index++){ CM+/.y T  
    if(hCallWnd[index]==NULL) W.  p'T}2  
     continue; L_}F.nbS5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7)y +QU]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .0]Odf:@  
   } 1)ZdkTF@H  
  } jLreN#:9  
 } #l_hiD`;r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /` 4B-Y4M4  
} k_7agW  
cy#N(S[ 1  
BOOL InitHotkey() ]o*-|[^?  
{ D,, x<JG|  
 if(hHook!=NULL){ -P=Hp/ELi  
  nHookCount++; 9E]7Etfw  
  return TRUE; NU!B|l  
 } O:W4W=K  
 else d# q8-  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Ozs&YZ  
  if(hHook!=NULL) Iih]q  
   nHookCount++; [^A>hs*  
  return (hHook!=NULL); 3Uni{Z]Q)  
} fnudu0k  
BOOL UnInit() |%5nV=&\  
{ %1e{"_$O9  
 if(nHookCount>1){ :faB7wduW;  
  nHookCount--; -LEpT$v|  
  return TRUE; 5gY9D!;:0D  
 } O@? *5  
 BOOL unhooked = UnhookWindowsHookEx(hHook); - x]gp5  
 if(unhooked==TRUE){ JbEQ35r  
  nHookCount=0; is}Y+^j.  
  hHook=NULL; [Xo}CU  
 }  FK|q*  
 return unhooked; F(;C \[Ep  
} =bB7$#al  
73kL>u  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v(z2,?/4  
{ &Ch~$Wb^  
 BOOL bAdded=FALSE; c9R|0Yn^J  
 for(int index=0;index<MAX_KEY;index++){ )>rHM6-W  
  if(hCallWnd[index]==0){ {Qj7?}xW  
   hCallWnd[index]=hWnd; =E' .T0v  
   HotKey[index]=cKey; hS +R /7  
   HotKeyMask[index]=cMask; {Aq:Kh`&  
   bAdded=TRUE; dE|luN~  
   KeyCount++; ,5thD  
   break; -XARew  
  } + +G %~)S:  
 } /a:L"7z  
 return bAdded; (Y$48@x  
} Shb"Jc_i  
dX5|A_Ex  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Rz!!;<ye8  
{ ELQc: t -2  
 BOOL bRemoved=FALSE; odC}RdN  
 for(int index=0;index<MAX_KEY;index++){ +a((,wAN2  
  if(hCallWnd[index]==hWnd){ 9aZ^m$tAt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }uk]1M2=  
    hCallWnd[index]=NULL; lF.yQ  
    HotKey[index]=0; !0 -[}vvU  
    HotKeyMask[index]=0; '7TT4~F  
    bRemoved=TRUE; d3K-|  
    KeyCount--; Q!"W)tD  
    break; ,7|Wf %X  
   } I 6Mr[#*  
  } UIi`bbJ  
 } >PMLjXK  
 return bRemoved; 5WG:m'$$  
} ##clReS  
XbKNH>  
void VerifyWindow() Ba /^CS  
{ JLH,:2  
 for(int i=0;i<MAX_KEY;i++){ YN 31Lo  
  if(hCallWnd!=NULL){ A J"/T+g_  
   if(!IsWindow(hCallWnd)){ RTRi{p  
    hCallWnd=NULL; q X>\*@  
    HotKey=0; SHT^Etri  
    HotKeyMask=0; <P4*7:jX  
    KeyCount--; f!aE/e\  
   } Qv>rww]  
  } IYk^eG:;  
 } Vm <9/UG<  
} uw`fC%-xh  
26<Wg7/,  
BOOL CHookApp::InitInstance() W;@9x1jK X  
{ ,=Fn6'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); yCG<qQz  
 hins=AfxGetInstanceHandle(); 7O.{g  
 InitHotkey(); dw]wQ\4B  
 return CWinApp::InitInstance(); l9X\\uG&  
} T&PLvyBL  
|8YP8o  
int CHookApp::ExitInstance() ?\$\YX%/p  
{ [.`%]Z(  
 VerifyWindow(); q^k]e{PD  
 UnInit();  @M E .  
 return CWinApp::ExitInstance(); N_Y*Z`Xb  
} /l@h[}g+d-  
2>!? EIE7  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file EU"J'?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <UMT:`h1MZ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 37QXML  
#if _MSC_VER > 1000 ]J* y`jn  
#pragma once lTn~VsoRZ  
#endif // _MSC_VER > 1000  ~ok i s  
O9tgS@*Tv  
class CCaptureDlg : public CDialog bxA1fA;  
{ dn)pVti_  
 // Construction }^R_8{>k  
 public: Jf{ M[ z  
  BOOL bTray; J%n{R60b  
  BOOL bRegistered; wu2C!gyBo  
  BOOL RegisterHotkey(); c@1q8,  
  UCHAR cKey; 3Ta<7tEM  
  UCHAR cMask; M?fRiOj  
  void DeleteIcon(); , JUP   
  void AddIcon(); ~1yMw.04V  
  UINT nCount; wuQ>|\Zs  
  void SaveBmp(); _p`@/[(|  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor GXE6=BO  
  // Dialog Data ^3:DeZf!u  
  //{{AFX_DATA(CCaptureDlg) f YuM`O  
  enum { IDD = IDD_CAPTURE_DIALOG }; }_{QsPx9  
  CComboBox m_Key; 0piBK=tE/  
  BOOL m_bControl; Jqt&TqX@s  
  BOOL m_bAlt; * (4TasQu  
  BOOL m_bShift; k v}<u  
  CString m_Path; yU@~UCmja  
  CString m_Number; WZ<kk T  
  //}}AFX_DATA 2%DleR'i  
  // ClassWizard generated virtual function overrides pM i w9}  
  //{{AFX_VIRTUAL(CCaptureDlg) QF fKEMN  
 public: ;5.o;|w?!  
  virtual BOOL PreTranslateMessage(MSG* pMsg); (BA2   
 protected: u8wZ2j4S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0kD8wj%  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); weOzs]uc  
  //}}AFX_VIRTUAL PZdYkbj  
  // Implementation /~LXY< -(  
 protected: P~+?:buqc  
  HICON m_hIcon; Bn"r;pqWiT  
  // Generated message map functions A!kNqJ2  
  //{{AFX_MSG(CCaptureDlg) #f'(8JjY  
  virtual BOOL OnInitDialog(); $J |oVVct  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); `FImi9%F  
  afx_msg void OnPaint(); 8O]U&A@  
  afx_msg HCURSOR OnQueryDragIcon(); S%ri/}qI[{  
  virtual void OnCancel(); X'&$wQ6,K  
  afx_msg void OnAbout(); 1 ]@}+H  
  afx_msg void OnBrowse(); 4JHQ^i-aY  
  afx_msg void OnChange(); /)i)wxi  
 //}}AFX_MSG tH:K6^oR  
 DECLARE_MESSAGE_MAP() ."Yub];H  
};  :*M\z3`k  
#endif |7Q8WjCQ{m  
c4LBlLv4  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {zGIQG9  
#include "stdafx.h" 6,xoxNoPP3  
#include "Capture.h" Ssu{Lj  
#include "CaptureDlg.h" 6QRfju'  
#include <windowsx.h> @"s\eL,r  
#pragma comment(lib,"hook.lib") ucj)t7O   
#ifdef _DEBUG 1V`]sfRK  
#define new DEBUG_NEW JLAg-j2  
#undef THIS_FILE 8mA6l0  
static char THIS_FILE[] = __FILE__; N,ik&NIWy  
#endif GtO5,d_  
#define IDM_SHELL WM_USER+1 &Jj> jCg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LM'` U-/e$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ](0 Vm_es  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A!k}  
class CAboutDlg : public CDialog BH0rT})  
{ 1TQ $(bI  
 public: lSyp k-c  
  CAboutDlg(); cM4?G gn  
  // Dialog Data `Ik}Xw  
  //{{AFX_DATA(CAboutDlg) oz5o=gt7  
  enum { IDD = IDD_ABOUTBOX }; %Z{J=  
  //}}AFX_DATA /&j4IlT  
  // ClassWizard generated virtual function overrides +lha^){  
  //{{AFX_VIRTUAL(CAboutDlg) 8VcAtrx_  
 protected: X}z KV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support TjI NxP-O  
  //}}AFX_VIRTUAL \Di~DN1  
  // Implementation ^y6Pkb P  
 protected: E2*"~gL^,  
  //{{AFX_MSG(CAboutDlg) ,.`^Wx6F  
  //}}AFX_MSG 6 qKIz{;  
  DECLARE_MESSAGE_MAP() !v;r3*#Nky  
}; %y w*!A1  
Sw1]]-Es  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) N~>?w#?J  
{ CJKH"'u3^  
 //{{AFX_DATA_INIT(CAboutDlg) Z `\7B e  
 //}}AFX_DATA_INIT ^}1RDdQ"U  
} oh@r0`J]x  
3`9*Hoy0c  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) PYHm6'5BtB  
{ $PS5xD~@  
 CDialog::DoDataExchange(pDX); b"FsT  
 //{{AFX_DATA_MAP(CAboutDlg) qfYb\b  
 //}}AFX_DATA_MAP <Z8] W1)  
} hTG d Uw]  
pO+1?c43  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2FVKgyV  
 //{{AFX_MSG_MAP(CAboutDlg) UiZ61lw  
 // No message handlers Gm2rjpZeq  
 //}}AFX_MSG_MAP UdI>x 4bI  
END_MESSAGE_MAP() DpS6>$v8t  
o mjLQp[%  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) rFy9K4D  
: CDialog(CCaptureDlg::IDD, pParent) *Ra")(RnDK  
{ n&C9f9S  
 //{{AFX_DATA_INIT(CCaptureDlg) zRJy3/>  
  m_bControl = FALSE; 5ZKnxEW,(  
  m_bAlt = FALSE; =-VV`  
  m_bShift = FALSE; CQ( @7  
  m_Path = _T("c:\\"); \7j)^  
  m_Number = _T("0 picture captured."); }\0"gM  
  nCount=0; b/K&8C,c  
  bRegistered=FALSE; ai`:HhE  
  bTray=FALSE; =!CuCV7$1O  
 //}}AFX_DATA_INIT 2@&|hd=-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 nIi_4=Z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); QNJG}Upl  
} kx=AX*I  
4a @iR2e  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) twu6z5<!-=  
{ ppnj.tLz;r  
 CDialog::DoDataExchange(pDX); p 5o;Rvr  
 //{{AFX_DATA_MAP(CCaptureDlg) KFs` u6  
  DDX_Control(pDX, IDC_KEY, m_Key); ^r& {V"l]  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ibuI/VDF  
  DDX_Check(pDX, IDC_ALT, m_bAlt); =5|5j!i=q  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); j>b OnCp~  
  DDX_Text(pDX, IDC_PATH, m_Path); r#Fu<so,  
  DDX_Text(pDX, IDC_NUMBER, m_Number); qJ/C*Wqic  
 //}}AFX_DATA_MAP >Qx#2x+  
} 2>!ykUw^O  
m5p~>]}fYF  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "/'= gE  
//{{AFX_MSG_MAP(CCaptureDlg) L,D>E  
 ON_WM_SYSCOMMAND() /r%+hS  
 ON_WM_PAINT() $F-XXBp  
 ON_WM_QUERYDRAGICON() ". 0W8=  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) jFXU xf  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Na6z,TW  
 ON_BN_CLICKED(ID_CHANGE, OnChange) YiCDV(prT  
//}}AFX_MSG_MAP $ B9=v  
END_MESSAGE_MAP() =@w:   
0@Ijk(|  
BOOL CCaptureDlg::OnInitDialog() |d3agfS[n  
{ * Z:PB%d5  
 CDialog::OnInitDialog(); ~?&ijhZ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); G'py)C5;  
 ASSERT(IDM_ABOUTBOX < 0xF000); f lB,_  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \+u qP:Ty  
 if (pSysMenu != NULL) biG9?  
 { 84[^#ke  
  CString strAboutMenu; r9Z/y*q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); u7=[~l&L  
  if (!strAboutMenu.IsEmpty()) 'JMa2/7CG  
  { bevT`D  
   pSysMenu->AppendMenu(MF_SEPARATOR); }m H>lN  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Vw*x3>`  
  } Ax0,7,8y  
 } h0 Sf=[>z  
 SetIcon(m_hIcon, TRUE); // Set big icon *mQit/ k.  
 SetIcon(m_hIcon, FALSE); // Set small icon 'm cJ/9)v  
 m_Key.SetCurSel(0); E%^28}dN  
 RegisterHotkey(); yx2.7h3  
 CMenu* pMenu=GetSystemMenu(FALSE); }SV3PdE  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); v/czW\z  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); fI1;&{f   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Du>HF;Fv  
 return TRUE; // return TRUE unless you set the focus to a control 3I5WDuq  
} QRlzGRueR&  
Ng"vBycy  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) i-?zwVmn  
{ @;6}xO2  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) cWc)sb  
 { $P(nh'\  
  CAboutDlg dlgAbout; %jxuH+L   
  dlgAbout.DoModal(); >D/~|`=p  
 } #& wgsGV8C  
 else ?Qig$  
 { T]|O/  
  CDialog::OnSysCommand(nID, lParam); gn"&/M9E  
 } OQ7c| O  
} AuTplO0_rE  
<dL04F  
void CCaptureDlg::OnPaint() h,>L(=c$O  
{ ^I{]Um:  
 if (IsIconic()) k Ml<  
 { $t$f1?  
  CPaintDC dc(this); // device context for painting =.E(p)fz  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [bv@qBL  
  // Center icon in client rectangle 9@Sb! 9h  
  int cxIcon = GetSystemMetrics(SM_CXICON); %20-^&zZ  
  int cyIcon = GetSystemMetrics(SM_CYICON); n6 G&^Oj  
  CRect rect; =BS'oBn^6  
  GetClientRect(&rect); XQOprIJ U  
  int x = (rect.Width() - cxIcon + 1) / 2; SSLs hY~d  
  int y = (rect.Height() - cyIcon + 1) / 2; ^qx\e$R  
  // Draw the icon a{*'pY(R0$  
  dc.DrawIcon(x, y, m_hIcon); ({KAh?  
 } dCP Tpm  
 else  s7 o*|Xv  
 { #`4^zU)  
  CDialog::OnPaint(); t4@g;U?o  
 } 6\Vu#r  
} MNqyEc""  
g u =fq\`  
HCURSOR CCaptureDlg::OnQueryDragIcon() \hW73a!  
{ eH955[fVd4  
 return (HCURSOR) m_hIcon; A9UaLSe  
}  sGls^J)  
+)JqEwCrq  
void CCaptureDlg::OnCancel() |u;BAb  
{ / JeqoM"x  
 if(bTray) W<91m*  
  DeleteIcon(); M5kHD]b  
  CDialog::OnCancel(); 9! HMQ  
} Zfv(\SI  
0Eu$-)  
void CCaptureDlg::OnAbout() f_h"gZWV  
{ )75yv<L2S,  
 CAboutDlg dlg; R%_H\-wo  
 dlg.DoModal(); z %3"d0  
} J+ZdZa}Ob  
$lAb6e$n  
void CCaptureDlg::OnBrowse() Q(5:~**I  
{ xO<-<sRA  
 CString str; 0nz@O^*g(  
 BROWSEINFO bi; bC>>^?U1m  
 char name[MAX_PATH]; pt%~,M _  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  +wW  
 bi.hwndOwner=GetSafeHwnd(); NE2sD  
 bi.pszDisplayName=name; @b*T4hwA.  
 bi.lpszTitle="Select folder"; u AS8F=9xP  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; >?W;>EUH  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Xb@z7X#O!  
 if(idl==NULL) FP9<E93br  
  return; uU(G_E ?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :.[5('  
 str.ReleaseBuffer(); |vDoqlW  
 m_Path=str; ws2 j:B  
 if(str.GetAt(str.GetLength()-1)!='\\') O;BMwg_7  
  m_Path+="\\"; B Ff. Rd95  
 UpdateData(FALSE); h"1"h.  
} *!]Epb  
199hQxib:  
void CCaptureDlg::SaveBmp() _2X6bIE  
{ 8wpwJs&V  
 CDC dc; @~#79B"9&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); AzO3(1:  
 CBitmap bm; O<Sc.@~  
 int Width=GetSystemMetrics(SM_CXSCREEN); _HHJw""j  
 int Height=GetSystemMetrics(SM_CYSCREEN); VWA-?%r  
 bm.CreateCompatibleBitmap(&dc,Width,Height); lDPRn~[#\  
 CDC tdc; hW !@$Ph  
 tdc.CreateCompatibleDC(&dc); #D LT-G0  
 CBitmap*pOld=tdc.SelectObject(&bm); $F@L$& ~  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); aU.0dsq  
 tdc.SelectObject(pOld); zNr_W[  
 BITMAP btm; <aSLm=  
 bm.GetBitmap(&btm); _h=< _Z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; AV[PQI  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); E}b> 7L&w  
 BITMAPINFOHEADER bih; W3{<e"  
 bih.biBitCount=btm.bmBitsPixel; iWN.3|r  
 bih.biClrImportant=0; $:u7Dv}\  
 bih.biClrUsed=0; 3@TG.)N4  
 bih.biCompression=0; Z_V&IQo-7  
 bih.biHeight=btm.bmHeight; o(X90X  
 bih.biPlanes=1; @@{_[ir  
 bih.biSize=sizeof(BITMAPINFOHEADER); vgQhdtt  
 bih.biSizeImage=size; kk_9G -M  
 bih.biWidth=btm.bmWidth; G9'YgW+$7  
 bih.biXPelsPerMeter=0; +ersP@G  
 bih.biYPelsPerMeter=0; ksOANLRN  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (ln  
 static int filecount=0; (m3I#L  
 CString name; :S99}pgY  
 name.Format("pict%04d.bmp",filecount++); 7Ysy\gZ&wp  
 name=m_Path+name; "Yfr"1RmO  
 BITMAPFILEHEADER bfh; AYPf)K;%  
 bfh.bfReserved1=bfh.bfReserved2=0; BV }(djx  
 bfh.bfType=((WORD)('M'<< 8)|'B'); x)#<.DX  
 bfh.bfSize=54+size; <7FP"YU  
 bfh.bfOffBits=54; $;)noYo  
 CFile bf; ^{fi^lL=  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \p3nd!OIG  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); g=oeS%>E  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 76IALJ00V  
  bf.WriteHuge(lpData,size); yNqm]H3<MP  
  bf.Close(); DNm7z[ t{  
  nCount++; X$uz=)  
 } N1+4bR  
 GlobalFreePtr(lpData); %KJhtd"q  
 if(nCount==1) @q{:Oc^  
  m_Number.Format("%d picture captured.",nCount); k{}[>))Q  
 else rtYb"-&  
  m_Number.Format("%d pictures captured.",nCount); ~E3SC@KL  
  UpdateData(FALSE); C:s^s  
} ^`TKvcgIc  
RQ*|+ ~H  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !4 4mT'Y  
{ #.MIW*==  
 if(pMsg -> message == WM_KEYDOWN) M\y~0uZ  
 { HoIKx_  
  if(pMsg -> wParam == VK_ESCAPE) s;-78ejj7  
   return TRUE; +YQ~t,/  
  if(pMsg -> wParam == VK_RETURN) FU]8.)`G  
   return TRUE; hk7(2j7B  
 } liugaRO8J  
 return CDialog::PreTranslateMessage(pMsg); gc,J2B]61  
} >p]WCb'PH  
\sHy.{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  VNr  
{ *@ <8&M9x  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ MfNpQ:]c\  
  SaveBmp(); Jv 6nlK`  
  return FALSE; ~ F?G5cN5  
} j1;_w  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?O<`h~'$+  
 CMenu pop; (^tr}?C  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >Bh)7>`3c  
 CMenu*pMenu=pop.GetSubMenu(0); + 4V1>e+  
 pMenu->SetDefaultItem(ID_EXITICON); =qV4Sje|q  
 CPoint pt; ;"d,~nLn  
 GetCursorPos(&pt); @pqY9_:P1  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); J+3\2D?  
 if(id==ID_EXITICON) dJ%wVY0z=  
  DeleteIcon(); VVI8)h8  
 else if(id==ID_EXIT)  fW5" 4,  
  OnCancel(); !7mvyc!'!  
 return FALSE; ( E"&UC[  
} uKR\Xo}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); so?pA@O  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) cotxo?)Zv  
 AddIcon(); o;M.Rt\A  
 return res; |n|U;|'^  
} -!'Oy%a#  
V_+}^  
void CCaptureDlg::AddIcon() %jbJ6c  
{ *2qh3  
 NOTIFYICONDATA data; _S9rF-9G]  
 data.cbSize=sizeof(NOTIFYICONDATA); >0Fxyv8  
 CString tip; ;xW8Z<\-  
 tip.LoadString(IDS_ICONTIP); p|FlWR'mA  
 data.hIcon=GetIcon(0); !q~X*ZKse  
 data.hWnd=GetSafeHwnd(); L~*|,h  
 strcpy(data.szTip,tip); ^f^-.X  
 data.uCallbackMessage=IDM_SHELL; P[Y{LKAbb  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; PtVo7zO ye  
 data.uID=98; VZT6;1TD$8  
 Shell_NotifyIcon(NIM_ADD,&data); 1&X}1  
 ShowWindow(SW_HIDE); u#a%(  
 bTray=TRUE; :DOr!PNA  
} o9KyAP$2  
bc3|;O  
void CCaptureDlg::DeleteIcon() [+hy_Nc$  
{ V]l&{hl,  
 NOTIFYICONDATA data; t7jh ?]  
 data.cbSize=sizeof(NOTIFYICONDATA); @!z$Sp=  
 data.hWnd=GetSafeHwnd(); 88Fb1!a5Z  
 data.uID=98; 763E 6,7  
 Shell_NotifyIcon(NIM_DELETE,&data); NqiB8hZ~  
 ShowWindow(SW_SHOW); JwN}Jm  
 SetForegroundWindow(); #d }0}7ue  
 ShowWindow(SW_SHOWNORMAL); 4o1Q7  
 bTray=FALSE; :0 W6uFNOU  
} tx^92R2/  
+Od1)_'\D3  
void CCaptureDlg::OnChange() *A~($ZtL  
{ ;jRL3gAe)  
 RegisterHotkey(); [n!$D(|"!V  
} 9nT?|n]>  
kJ%{ [1fr  
BOOL CCaptureDlg::RegisterHotkey() TqENaC#&  
{ NEq t).   
 UpdateData(); Y5n z?a  
 UCHAR mask=0; VKq0 <+M  
 UCHAR key=0; $Nj'OJSj%  
 if(m_bControl) 8q_1(& O  
  mask|=4; r5f^WZ$-  
 if(m_bAlt) +IwdMJ8&8  
  mask|=2; IV)^;i  
 if(m_bShift) I#i?**  
  mask|=1; e%PC e9  
  key=Key_Table[m_Key.GetCurSel()]; mDb-=[W5  
 if(bRegistered){ Jz~+J*r;]A  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); kmZ.U>#  
  bRegistered=FALSE; 3x04JE3!  
 } [:AB$l*  
 cMask=mask; 5Z* b(R  
 cKey=key; |$YyjYK  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); BhqhyX\D&y  
 return bRegistered; sFbfFUd  
} $a`J(I  
z[WC7hvU  
  四、小结 fm3(70F\  
8# 6\+R  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八