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
  • 7214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: I=dn]}b#P  
  ^.:&ZsqV  
  一、实现方法 8Ygf@*9L4  
j_5&w Znq  
  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: ?5CE<[  
@U!&XZ]h  
#pragma data_seg("shareddata") %~:\f#6  
HHOOK hHook =NULL; //钩子句柄 LCSvw  
UINT nHookCount =0; //挂接的程序数目 G%k&|  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 :xHKbWz6j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 4AzDWK@/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey AS]8rH  
static int KeyCount =0; iDcTO}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %Mj,\J!  
#pragma data_seg() aAe`o2Xs  
<.Zh{"$qo  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 j_d}?jh  
p>eYi \'  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 9{4oz<U  
8x- 19#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /fUdb=!Z  
cKey,UCHAR cMask) 3\4e{3$  
{ vv&< 7[  
 BOOL bAdded=FALSE; 2H w7V3q  
 for(int index=0;index<MAX_KEY;index++){ A{4,ih"5  
  if(hCallWnd[index]==0){ }j2;B 8j  
   hCallWnd[index]=hWnd; >d`GNE  
   HotKey[index]=cKey; t]0DT_iE  
   HotKeyMask[index]=cMask; E} ]=<8V  
   bAdded=TRUE; #/ePpSyD  
   KeyCount++; c*B< - l<5  
   break; mS[``$Z\!  
  } #lMcAYH,  
 } ;`^_9 K  
 return bAdded; x2t&Wpvt  
} g%Tokl  
//删除热键 S`YT"|~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lr4wz(q<9  
{ Odwf7>  
 BOOL bRemoved=FALSE; 9QX!HQ|5y8  
 for(int index=0;index<MAX_KEY;index++){ I4%kYp]  
  if(hCallWnd[index]==hWnd){ [K,P)V>K  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }F0<8L6%  
    hCallWnd[index]=NULL; =r/8~~=  
    HotKey[index]=0; ,,G"EF0A  
    HotKeyMask[index]=0; ML'y`S  
    bRemoved=TRUE; =PY{Elf  
    KeyCount--; 4Cu\|"5)  
    break; $b2~Wj*-nJ  
   } ]e),#_M  
  } "p3<-06  
 } %y9sC1T  
 return bRemoved; L7{}`O/g7  
} 5qH*"i+|s  
;v\s7y  
n%29WF6Zf  
  DLL中的钩子函数如下: )V~=B]  
s}". po]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fZ &  
{ x#3*C|A  
 BOOL bProcessed=FALSE; y+k^CT/u  
 if(HC_ACTION==nCode) P<Bx1H-z-  
 { O >+=cg  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 UFT JobU  
   switch(wParam) p~3 x=X4  
   {  0ZwXuq  
    case VK_MENU: k L6s49  
     MaskBits&=~ALTBIT; /d}"s.3p  
     break; +kd1q  
    case VK_CONTROL: I;"pPJ3G  
     MaskBits&=~CTRLBIT; d'Bxi"K  
     break; 8#JX#<HEo  
    case VK_SHIFT: TW>GYGz  
     MaskBits&=~SHIFTBIT; w!H(zjv&(  
     break; >i*,6Psl[Z  
    default: //judge the key and send message JDR_k  
     break; Uc:NW   
   } e(/F:ZEh  
   for(int index=0;index<MAX_KEY;index++){ !@ ]IJ"\  
    if(hCallWnd[index]==NULL) *GoTN  
     continue; ssLswb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >w<w*pC  
    { @%x2d1FS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nS3Aadm  
     bProcessed=TRUE; d/yF}%0QI  
    } NjZ~b/  
   } MhCU; !  
  } 9MfU{4:;I  
  else if((lParam&0xc000ffff)==1){ //有键按下 yIn$ApSGY  
   switch(wParam) ? -:2f#bC  
   { 11"r FZ  
    case VK_MENU: q 0F6MAXj  
     MaskBits|=ALTBIT; fWq*Op.]c  
     break; V:L%GWU  
    case VK_CONTROL: DFWO5Y_  
     MaskBits|=CTRLBIT; h_#=f(.'j  
     break; u#EcR}=]  
    case VK_SHIFT: aR6F%7gvz  
     MaskBits|=SHIFTBIT; ^D+^~>f  
     break; B%uY/Mwz$  
    default: //judge the key and send message .\_RavW23  
     break; tXtNK2-1  
   } 8O]`3oa>  
   for(int index=0;index<MAX_KEY;index++){ z mip  
    if(hCallWnd[index]==NULL) 4zS0kk;+  
     continue; =[]6NjKS,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ciODTq?  
    { 3E*m.jX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [s[ZOi!;I  
     bProcessed=TRUE; e^\e;>Dh>  
    } ]Ac}+?  
   } l~;>KjZg  
  } \t=0rFV)t  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Godrz*"  
   for(int index=0;index<MAX_KEY;index++){ =W3 K6w  
    if(hCallWnd[index]==NULL) rWL;pM<  
     continue;  iiQn/%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -JgNujt#9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); M]r?m@)  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 =w+8q1!o  
   } :K^J bQ  
  } wxvi)|)  
 } VSY  p  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h*l$!nEN  
} =XR6rR8  
\wA:58 -j  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 0pMN@Cz6  
'+_>PBOc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cw!,.o%cD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =D$ED^W  
%a~/q0o>  
  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: 5_'lu  
&;-zy%#l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4Wiy2  
{ <v0`r2^S{-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) `Fn"QL-  
 { 0uDDaFS  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #gV n7wq  
  SaveBmp(); I2*rtVAP'j  
  return FALSE; zw+aZDcV(  
 } >E+g.5 ,:W  
 …… //其它处理及默认处理 W#<1504ip  
} 7m-%  
_aPAn|.  
=lJ ?yuc  
  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。 "wOfs$w%s  
4`#Q  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 uem-fTG  
).5 X  
  二、编程步骤 NV4g5)D&L  
tsc `u>  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; >l &]Ho  
Y'|,vG  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; y+ze`pL?  
[oTe8^@[  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; !G;u )7'v  
{o24A: M  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; {zAI-?#*u  
qazA,|L!  
  5、 添加代码,编译运行程序。 +\Vm t[v  
RHC ZP  
三、程序代码 mF*x&^ie  
~+dps i  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ?+d`_/IB  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) U0_^6zd_  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 0MHiW=  
#if _MSC_VER > 1000 Ax=HDW}  
#pragma once >lRZvf-i  
#endif // _MSC_VER > 1000 G7CeWfS  
#ifndef __AFXWIN_H__ ls@]%pz.1d  
#error include 'stdafx.h' before including this file for PCH R p&J!hlA  
#endif U7s$';y"%  
#include "resource.h" // main symbols O{X~,Em=q  
class CHookApp : public CWinApp >u$8Z  
{ Tzex\]fw  
 public: -)}s{[]d6m  
  CHookApp(); sE"s!s/  
  // Overrides :k/Xt$`  
  // ClassWizard generated virtual function overrides 2 kDsIEA  
  //{{AFX_VIRTUAL(CHookApp) `} PYltW  
 public: 6$r\p2pi0  
  virtual BOOL InitInstance(); )]1hN;Nz  
  virtual int ExitInstance(); 6CBk=)qH  
  //}}AFX_VIRTUAL dDPQDIx  
  //{{AFX_MSG(CHookApp) _B^zm-}8|B  
  // NOTE - the ClassWizard will add and remove member functions here. ~18a&T:  
  // DO NOT EDIT what you see in these blocks of generated code ! WBE>0L  
  //}}AFX_MSG C{}_Rb'x  
  DECLARE_MESSAGE_MAP() \~5|~|9<  
}; q7X]kr*qx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); OH\^j1x9I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3xChik{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Uq  .6h  
BOOL InitHotkey(); A0DGDr PD  
BOOL UnInit(); /\8I l+0  
#endif T`EV uRJ  
*|A QV:  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ;/K2h_=3z  
#include "stdafx.h" zU?O)w1'  
#include "hook.h" /}?7Eni  
#include <windowsx.h> !__0Vk[s  
#ifdef _DEBUG [%P#ieD4  
#define new DEBUG_NEW #V!a<w4_  
#undef THIS_FILE ,'X"(tpu@  
static char THIS_FILE[] = __FILE__; IP62|~Ap  
#endif YQ+hQ:4-  
#define MAX_KEY 100 ]i*ucW4  
#define CTRLBIT 0x04 (GSP3KKo*G  
#define ALTBIT 0x02 Cu[-<>my  
#define SHIFTBIT 0x01 (>v'0 RA  
#pragma data_seg("shareddata") \/NF??k,jk  
HHOOK hHook =NULL; ukWn@q*  
UINT nHookCount =0; @?3f`l 9  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey LIZB!S@V\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3 t,_{9  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ix3LB!k<  
static int KeyCount =0; Zl9@E;|=  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift L)sgW(@2  
#pragma data_seg() [qYr~:`-[  
HINSTANCE hins; 5>x_G#W  
void VerifyWindow(); h|qJ{tUWc$  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) vQMBJ&  
//{{AFX_MSG_MAP(CHookApp) 8`q7Yss6F  
// NOTE - the ClassWizard will add and remove mapping macros here. TekUY m!G  
// DO NOT EDIT what you see in these blocks of generated code! |mb2<!ag{  
//}}AFX_MSG_MAP 7j]v_2S`  
END_MESSAGE_MAP() ~e{ @5.g  
1 R5 pf  
CHookApp::CHookApp() ZwmucY%3  
{ -#|D>  
 // TODO: add construction code here, q A)O kR'm  
 // Place all significant initialization in InitInstance cr1x CPJj  
}  ?%,NOX  
un{ZysmtB6  
CHookApp theApp; m@4Dz|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6\4-I^=B  
{ \|;\  
 BOOL bProcessed=FALSE; /at7 H!  
 if(HC_ACTION==nCode) CXlbtpK2k  
 { qkb'@f=  
  if((lParam&0xc0000000)==0xc0000000){// Key up NX @FUct;  
   switch(wParam) PMzPj,  
   { (`tRJWbdz  
    case VK_MENU: :L[>!~YG_n  
     MaskBits&=~ALTBIT; aLO^>",  
     break; I.<c{4K5  
    case VK_CONTROL: 2{OR#v~  
     MaskBits&=~CTRLBIT; P6:C/B  
     break; /).{h'^Hq\  
    case VK_SHIFT: R?{+&r.X  
     MaskBits&=~SHIFTBIT; F/>_PH57  
     break; Wl j&_~  
    default: //judge the key and send message .JhQxXj  
     break; _P;D.>?  
   } [,zq  
   for(int index=0;index<MAX_KEY;index++){ 4U}qrN~=  
    if(hCallWnd[index]==NULL) ym%UuC3^w  
     continue; Ni,nQ;9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uDF;_bli)H  
    { Fhoyji4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); OZ[YB  
     bProcessed=TRUE; Yd^@Ei9  
    } G=zWhqieh  
   } =&HLz 7|  
  } J!I)G&:  
  else if((lParam&0xc000ffff)==1){ //Key down %Tm*^  
   switch(wParam) zsFzg.$3&  
   { ;XKe$fsa~?  
    case VK_MENU: *ukyQZ9  
     MaskBits|=ALTBIT; .fA*WQ!lb  
     break; %oZ:Awx  
    case VK_CONTROL: J$dwy$n  
     MaskBits|=CTRLBIT; D Ez,u^   
     break; 25^?|9o7  
    case VK_SHIFT: bF'rK'',  
     MaskBits|=SHIFTBIT; -fR :W{u  
     break; }lJ;|kx$  
    default: //judge the key and send message }cKB)N BJb  
     break; \o9 \i kR  
   } _VtQMg|u  
   for(int index=0;index<MAX_KEY;index++) xP;r3u s  
   { O7K.\  
    if(hCallWnd[index]==NULL) {@Mr7*u  
     continue; o2 14V\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wX$:NOO  
    { /ZLY@&M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); xO~ ElzGm  
     bProcessed=TRUE; jlEz]@ i  
    } ()3\(d5e  
   } 'rQ"Dc1D  
  } A'WR!*Yt  
  if(!bProcessed){ .g*j]!_]  
   for(int index=0;index<MAX_KEY;index++){ 7N.b-}$(  
    if(hCallWnd[index]==NULL) >DqF>w.1  
     continue; :6^7l/p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?$r`T]>`2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0XHQ 5+"8  
   } M6Fo.eeK3  
  } Q?{%c[s  
 } U84W(X  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P]E-Wp'p  
} j0jl$^  
q'2vE;z Kb  
BOOL InitHotkey() EE/mxN(<  
{ 3a/n/_D  
 if(hHook!=NULL){ Y.tx$%  
  nHookCount++; d:H'[l.F%  
  return TRUE; l'@-?p(Vuw  
 } VJh8`PVX  
 else SC{m@  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 1J@Iekat  
  if(hHook!=NULL) P&-o>mM  
   nHookCount++; <Au2e  
  return (hHook!=NULL); iCt.rr~;V  
} ZzT=m*tQ&  
BOOL UnInit() s='+[*&&  
{ DL]tg [w{  
 if(nHookCount>1){ pl[J!d.c  
  nHookCount--; " \$^j#o  
  return TRUE; @NHh- &;w  
 } <=uYfi3,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); D28`?B9 (  
 if(unhooked==TRUE){ 8% @| /  
  nHookCount=0; OMGggg  
  hHook=NULL; WzMYRKZ  
 } 5En6f`nR{  
 return unhooked; 0}{xH  
} NE995;  
iyskADS  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s?SspuV  
{ ,S)r%[ru^  
 BOOL bAdded=FALSE; L74Mz]v  
 for(int index=0;index<MAX_KEY;index++){ _GOSqu!3Y  
  if(hCallWnd[index]==0){ J 3!~e+wn  
   hCallWnd[index]=hWnd; H'+7z-% G  
   HotKey[index]=cKey; {4"V)9o-1>  
   HotKeyMask[index]=cMask; |"H 2'L$  
   bAdded=TRUE; ~z,o):q1 }  
   KeyCount++; (!j#u)O  
   break; 6CJMQi,kn  
  } 8;PkuJR_]  
 } yNTd_XPL  
 return bAdded; IThd\#=  
} . ,7bGY 1$  
p!.~hw9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X/!_>@`7?  
{ xad`-vw  
 BOOL bRemoved=FALSE; yPyu)  
 for(int index=0;index<MAX_KEY;index++){ NnZW@ln"|  
  if(hCallWnd[index]==hWnd){ t [QD#;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $ {Z0@G+  
    hCallWnd[index]=NULL; Xtp8 ^4Va  
    HotKey[index]=0; 1uF$$E6[  
    HotKeyMask[index]=0; Q YJ EUC@  
    bRemoved=TRUE; cHFi(K]|1  
    KeyCount--; 0X$mT:=9  
    break; 99m2aT()  
   } ,d G.67  
  } 7#8Gn=g  
 } =x~I'|%3  
 return bRemoved; b@:OlZ~ %  
} c]=2>ov)hR  
GW2\YU^{  
void VerifyWindow() 18g_v"6o  
{ 6( HF)z  
 for(int i=0;i<MAX_KEY;i++){ [P$Xr6#  
  if(hCallWnd!=NULL){ UA[`{rf  
   if(!IsWindow(hCallWnd)){ r8k(L{W  
    hCallWnd=NULL; |rmelQ-  
    HotKey=0; )U^=`* 7  
    HotKeyMask=0; m 2H4V+M+  
    KeyCount--; JJ.8V72;!Z  
   } 3f;=#|l  
  } <,d550GSm  
 } 37AVk`a  
} 5>532X(0  
j;x()iZ<  
BOOL CHookApp::InitInstance() UK`A:N2[  
{ *MF9_V)8V  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); gGqrFh\  
 hins=AfxGetInstanceHandle(); p|UL<M9{a]  
 InitHotkey(); 6r7>nU&d  
 return CWinApp::InitInstance(); 8tvmqe_G  
} <}a?<):S  
+X?ErQm  
int CHookApp::ExitInstance() ~ELY$G.xl  
{ =w2 4(S  
 VerifyWindow(); PK*Wu<<  
 UnInit(); A2 l?F  
 return CWinApp::ExitInstance(); |Q?h"5i"(  
} 6Z\aJ  
'o$j~Mr  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Z:4/lx7Bq  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) t;O)   
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_  tm1 =  
#if _MSC_VER > 1000 pP<8zTLn  
#pragma once c{#2;k Q,  
#endif // _MSC_VER > 1000 /qpSmRL  
h$S#fY8   
class CCaptureDlg : public CDialog Y\xEPh  
{ =C %)(|  
 // Construction bQ< qdGa  
 public: <'y<8gpM  
  BOOL bTray; }\4yU=JP K  
  BOOL bRegistered; 24sMX7Q,i  
  BOOL RegisterHotkey(); 5Rqdo\vE  
  UCHAR cKey; =?sG~  
  UCHAR cMask; /\J0)V  
  void DeleteIcon(); @!ChPl  
  void AddIcon(); c-Gp|.C  
  UINT nCount; Met?G0[  
  void SaveBmp(); W"{Ggk `  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor qpQ;,8X-"  
  // Dialog Data *yq65yZi5  
  //{{AFX_DATA(CCaptureDlg) xATx2*@X2  
  enum { IDD = IDD_CAPTURE_DIALOG }; (m]l -Re  
  CComboBox m_Key; Nc[@QC{  
  BOOL m_bControl; +{UY9_~\3  
  BOOL m_bAlt; E^8|xT'h6  
  BOOL m_bShift; *P mZqe  
  CString m_Path; :X>Wd+lY:_  
  CString m_Number; U-|]A\`)I  
  //}}AFX_DATA %9-^,og  
  // ClassWizard generated virtual function overrides Rv1W&s&  
  //{{AFX_VIRTUAL(CCaptureDlg) T"wg/mT  
 public: l4C{LZ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); osC?2.  
 protected: j^G=9r[,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O&!R7T  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); (s8b?Ol/  
  //}}AFX_VIRTUAL )~2\4t4|g  
  // Implementation RpdUR*K9x  
 protected: O'4G'H)   
  HICON m_hIcon; W"\~O"a  
  // Generated message map functions +C~h(  
  //{{AFX_MSG(CCaptureDlg) @yp0WB  
  virtual BOOL OnInitDialog(); 3%v)!dTa<^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -CPtYG[s  
  afx_msg void OnPaint(); Dfs^W{YA  
  afx_msg HCURSOR OnQueryDragIcon(); +n^M+ea;  
  virtual void OnCancel(); 9QQ XB-  
  afx_msg void OnAbout(); qS?o22  
  afx_msg void OnBrowse(); p fc6;K:d  
  afx_msg void OnChange(); s-p)^B  
 //}}AFX_MSG HxI6_>n^I  
 DECLARE_MESSAGE_MAP() J4bP(=w!  
}; A?R`~*Q5  
#endif ljFq;!I5  
d/_D|ivZ=  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ki1(b]rf  
#include "stdafx.h" x0j5D  
#include "Capture.h" P&`%VW3E  
#include "CaptureDlg.h" N'{[BA(eE  
#include <windowsx.h> Ejug2q  
#pragma comment(lib,"hook.lib") =\Q< TY  
#ifdef _DEBUG ~${~To8$CW  
#define new DEBUG_NEW OG$n C  
#undef THIS_FILE  "'4  
static char THIS_FILE[] = __FILE__; j6%W+;{/pj  
#endif XgxE M1(  
#define IDM_SHELL WM_USER+1 *6I$N>1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <AgB"y@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ZP"; B^J  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; !h? HfpYv  
class CAboutDlg : public CDialog ~J\qkQ  
{ $6Ma{rC|  
 public: 0ix(1`Z  
  CAboutDlg(); >u=  
  // Dialog Data "FHJ_$!  
  //{{AFX_DATA(CAboutDlg) M9)4ihK  
  enum { IDD = IDD_ABOUTBOX }; Wf c/?{  
  //}}AFX_DATA v[L+PD U  
  // ClassWizard generated virtual function overrides a (U52dO,  
  //{{AFX_VIRTUAL(CAboutDlg) [?K>s>it  
 protected: [>ghs_?dZ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 77\+V 0cF  
  //}}AFX_VIRTUAL Es>' N3A z  
  // Implementation 6 Bq_<3P_  
 protected: 5CK+\MK  
  //{{AFX_MSG(CAboutDlg) A f'&, 1=q  
  //}}AFX_MSG ~5 6&!4  
  DECLARE_MESSAGE_MAP() )>@S8v,(  
}; bEcs(Mc~  
|[],z 8  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t/ \S9  
{ WI\a  
 //{{AFX_DATA_INIT(CAboutDlg) E/cV59  
 //}}AFX_DATA_INIT ^E}?YgNp  
}  h,/Aq  
)kep:-wm  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ^ZMbJe%L  
{ rrL.Y&DTK  
 CDialog::DoDataExchange(pDX); [,Ehu<mEK  
 //{{AFX_DATA_MAP(CAboutDlg) o~$O$  
 //}}AFX_DATA_MAP  Bx45yaT  
} A]c'T T@6  
bM?gAY]mB8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7O1MC 8{  
 //{{AFX_MSG_MAP(CAboutDlg) '$FF/|{  
 // No message handlers ] SJ#:7  
 //}}AFX_MSG_MAP py;p7y!gxA  
END_MESSAGE_MAP() E#!N8fQ  
 kN=&"  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,I"T9k-^  
: CDialog(CCaptureDlg::IDD, pParent) !!\}-r^y%  
{ @}y.  
 //{{AFX_DATA_INIT(CCaptureDlg) sVx}(J  
  m_bControl = FALSE; gnJ8tuS  
  m_bAlt = FALSE; q>_<\|?%x  
  m_bShift = FALSE; ^J]&($-  
  m_Path = _T("c:\\"); `W86]ut[  
  m_Number = _T("0 picture captured."); : UeK0  
  nCount=0; s)Y1%#  
  bRegistered=FALSE; { Zgd  
  bTray=FALSE; pU_3Z3CeE  
 //}}AFX_DATA_INIT >YI Vi4''  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !Cgj >=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); um%_kX  
} 5L3+KkX@  
^PEw#.WG  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "Z&.m..gc  
{ biHacm  
 CDialog::DoDataExchange(pDX); t7byOMC  
 //{{AFX_DATA_MAP(CCaptureDlg) "$(+M t^  
  DDX_Control(pDX, IDC_KEY, m_Key); mx^Ga=: ?  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); \3hA_{ w  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 5x+]uABE  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); #@FA=p[%  
  DDX_Text(pDX, IDC_PATH, m_Path); qfsPX6]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); d+,!>.<3  
 //}}AFX_DATA_MAP |Gic79b  
} X['9;1Xr  
6f +aGz  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) f<8Hvumw  
//{{AFX_MSG_MAP(CCaptureDlg) lpG%rN!  
 ON_WM_SYSCOMMAND() OZ\6qMH3e  
 ON_WM_PAINT() #Hrzk!&9   
 ON_WM_QUERYDRAGICON() L/"MRQ"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) HAjl[c  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) j n^X{R\  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %,bD| NKp  
//}}AFX_MSG_MAP 6]v}  
END_MESSAGE_MAP() ~5,^CTAM  
MZGhN brd  
BOOL CCaptureDlg::OnInitDialog() l 5-[a  
{ !<M eWo  
 CDialog::OnInitDialog(); DFMpU.BN W  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); gsL=_# ?  
 ASSERT(IDM_ABOUTBOX < 0xF000); m,)s8_a  
 CMenu* pSysMenu = GetSystemMenu(FALSE); IV,4BQ$  
 if (pSysMenu != NULL) lp}S'^ y  
 { f3O6&1D  
  CString strAboutMenu; r *K  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ! JA;0[;l=  
  if (!strAboutMenu.IsEmpty()) Cu7{>"  
  { 529b. |  
   pSysMenu->AppendMenu(MF_SEPARATOR); =Pv_,%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *I 1H  
  } X%b1KG|#(  
 } %mC@}  
 SetIcon(m_hIcon, TRUE); // Set big icon ny{C,1QG  
 SetIcon(m_hIcon, FALSE); // Set small icon Om*QN]lGq  
 m_Key.SetCurSel(0); CY o m  
 RegisterHotkey(); ILm +o$o ~  
 CMenu* pMenu=GetSystemMenu(FALSE); (H_dZL  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); '?C6P5fm  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7Bj,{9^aJ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); M hN;GMH  
 return TRUE; // return TRUE unless you set the focus to a control -,")GA+[7  
} j*>J1M3E  
[1rQ'FBB^1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) =muQ7l:(  
{ "'CvB0>   
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {VAih-y  
 { _^E NRk@  
  CAboutDlg dlgAbout; @bg9 }Z%\h  
  dlgAbout.DoModal(); ?;,;  
 } h~>1 -T8  
 else }StzhV{GS  
 { akvi^]x  
  CDialog::OnSysCommand(nID, lParam); -K/+}4i3N  
 } [|:{qQyD  
} zyS8LZ-y9  
uZ?P{E,K  
void CCaptureDlg::OnPaint() vx9!KWy}  
{ 4A J]qu  
 if (IsIconic()) JX0M3|I=  
 { ox&5} &\  
  CPaintDC dc(this); // device context for painting AQZ<,TE0,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); bqbG+ g  
  // Center icon in client rectangle ]q"&V\b  
  int cxIcon = GetSystemMetrics(SM_CXICON); hF$`=hE,F~  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4|PWR_x  
  CRect rect; jC&fnt,O  
  GetClientRect(&rect); Ql{#dcRx  
  int x = (rect.Width() - cxIcon + 1) / 2; r<0E[ ~  
  int y = (rect.Height() - cyIcon + 1) / 2; *duG/?>P  
  // Draw the icon >SXSrXyYX  
  dc.DrawIcon(x, y, m_hIcon); k>ErD v8  
 } b/_Zw^DPC  
 else `Moo WG  
 { &m3-][ !n  
  CDialog::OnPaint(); eDpi0htm  
 } htB7 j(  
} +;W%v7 %<  
Gj?Zbl <  
HCURSOR CCaptureDlg::OnQueryDragIcon() `%Fp'`ZM$8  
{ {($bz T7c  
 return (HCURSOR) m_hIcon; (m3hD)!+y  
} ]+:yfDtZd  
4.,EKw3  
void CCaptureDlg::OnCancel() \d"\7SA  
{ Zbnxs.i!  
 if(bTray) 9p8ajlYg,  
  DeleteIcon(); ^8&}Nk[j  
  CDialog::OnCancel(); UC+Qn  
} jV2H61d  
i\CA6I  
void CCaptureDlg::OnAbout() 7RT{RE  
{ wm@j(h4  
 CAboutDlg dlg; P|Aac,nE+^  
 dlg.DoModal(); ?d%)R*3IX  
} pwN2Nzski  
Yh95W  
void CCaptureDlg::OnBrowse() 1NP  
{ _\>y[e["p  
 CString str; 2mEqfy  
 BROWSEINFO bi; C@Wzg  
 char name[MAX_PATH]; I7vP*YE 7F  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 5.^pD9[mT  
 bi.hwndOwner=GetSafeHwnd(); ;"&?Okz  
 bi.pszDisplayName=name; %<kfW&_>w  
 bi.lpszTitle="Select folder"; {jD?obs  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; |it*w\+M  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); >Cr"q*  
 if(idl==NULL) q]{gAGe~  
  return; r $S9/  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2xN7lfu1RB  
 str.ReleaseBuffer(); uL)MbM]  
 m_Path=str; im*sSz 0 (  
 if(str.GetAt(str.GetLength()-1)!='\\') 7=fM}sk  
  m_Path+="\\"; "\*)KH`C  
 UpdateData(FALSE); a>GA=r  
} 3.YH7rN  
| +;ZC y  
void CCaptureDlg::SaveBmp() DG;u_6;JR  
{ {APfSD_4  
 CDC dc; O ?T~>|  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Gxd/t#;  
 CBitmap bm; `&NFl'l1C  
 int Width=GetSystemMetrics(SM_CXSCREEN); v.W!  
 int Height=GetSystemMetrics(SM_CYSCREEN); "5eD >!  
 bm.CreateCompatibleBitmap(&dc,Width,Height); KJFQ)#SW!  
 CDC tdc; p>)1Z<D"a  
 tdc.CreateCompatibleDC(&dc); =+X*$'<J  
 CBitmap*pOld=tdc.SelectObject(&bm); ;,-)Z|W  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); q-t%spkl  
 tdc.SelectObject(pOld); eSoX|2g  
 BITMAP btm; _j+,'\B  
 bm.GetBitmap(&btm); *{?2M6Z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; N d>zq  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); E{6ku=2F  
 BITMAPINFOHEADER bih; k?h{ 6Qd  
 bih.biBitCount=btm.bmBitsPixel; Mzg3i*  
 bih.biClrImportant=0; NATi)A"TZ  
 bih.biClrUsed=0; }F1Asn  
 bih.biCompression=0; _A]jiPq  
 bih.biHeight=btm.bmHeight; *?Eu{J){7%  
 bih.biPlanes=1; ]yKwH 9sl  
 bih.biSize=sizeof(BITMAPINFOHEADER); wp:$Tqa$  
 bih.biSizeImage=size; 8TYh&n=r  
 bih.biWidth=btm.bmWidth; pW ~;B*hF  
 bih.biXPelsPerMeter=0; 87[o^)8  
 bih.biYPelsPerMeter=0; w'}s'gGE  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); TJNE2  
 static int filecount=0; "|i1A R:I  
 CString name; 5S? "<+J'  
 name.Format("pict%04d.bmp",filecount++); S*}GW-)oA  
 name=m_Path+name; nxN("$'cq  
 BITMAPFILEHEADER bfh; jEKa9rt  
 bfh.bfReserved1=bfh.bfReserved2=0; 07^.Z[(pCt  
 bfh.bfType=((WORD)('M'<< 8)|'B'); M(8xwo-W  
 bfh.bfSize=54+size; 4`~OxL  
 bfh.bfOffBits=54; ,dba:D= l  
 CFile bf; `*CoVx~fk  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (a!E3y5,  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); e~QLzZ3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); j 1'H|4  
  bf.WriteHuge(lpData,size); NHZMH!=4:n  
  bf.Close(); E2 'Al6^C  
  nCount++; Ew}GPJ  
 } H?opG<R=ek  
 GlobalFreePtr(lpData); fx 08>r   
 if(nCount==1) zX=%BL?  
  m_Number.Format("%d picture captured.",nCount); b c .Vy  
 else CWs;1`aP  
  m_Number.Format("%d pictures captured.",nCount); yq3"VFh3d  
  UpdateData(FALSE); ~=wBF  
} ,hK =x  
mp3Dc  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 7TAoWD3  
{ a w~a /T:  
 if(pMsg -> message == WM_KEYDOWN) 'PMzm/;8st  
 { $.DD^ "9  
  if(pMsg -> wParam == VK_ESCAPE) RW>F %P  
   return TRUE; m$Tt y[0  
  if(pMsg -> wParam == VK_RETURN) /XRgsF  
   return TRUE; ^umHuAAE  
 } Ahd{f!  
 return CDialog::PreTranslateMessage(pMsg); M]\"]H?  
} oQyMs>g  
T5~Qfl?Y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #oGvxc7  
{ " 6$+B/5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ g 'L$m|  
  SaveBmp(); "z.!h(Eq  
  return FALSE; y^p%/p%  
} @Ng q+uXm  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [\HAJA,  
 CMenu pop; IsL=DV/  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); r~;.8qs  
 CMenu*pMenu=pop.GetSubMenu(0); .hvn/5s  
 pMenu->SetDefaultItem(ID_EXITICON); /9y'UKl7[  
 CPoint pt; f2|On6/  
 GetCursorPos(&pt);  4z|Yfvq  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); HV3wUEI3  
 if(id==ID_EXITICON) %4To@#c  
  DeleteIcon(); 0@f7`D  
 else if(id==ID_EXIT) ,Ur~DXY  
  OnCancel(); {iq{<;)U?U  
 return FALSE; p|Fhh\,*`X  
} G`!;RX  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); A&'HlI% J  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (aCl*vV1  
 AddIcon(); 9]8M {L  
 return res; WY~}sE  
} \v_t: "  
,TO&KO1;&  
void CCaptureDlg::AddIcon() \;tKss!|  
{ qpc2;3*7  
 NOTIFYICONDATA data; S4~;bsSx  
 data.cbSize=sizeof(NOTIFYICONDATA); gk6j5 $Y"<  
 CString tip; nuv$B >  
 tip.LoadString(IDS_ICONTIP); 28+ Sz>SP  
 data.hIcon=GetIcon(0); y+iuA@WCv  
 data.hWnd=GetSafeHwnd(); 0H.B>: pv  
 strcpy(data.szTip,tip); w1A&p  
 data.uCallbackMessage=IDM_SHELL; $j}sxxTT  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; e$(i!G)  
 data.uID=98; 7 -V_)FK2c  
 Shell_NotifyIcon(NIM_ADD,&data); >Q\H1|?  
 ShowWindow(SW_HIDE); ELNA-ZKp  
 bTray=TRUE;  WU,72g=  
} $t </{]iX  
*t|j+*c}  
void CCaptureDlg::DeleteIcon() .'AHIR&>  
{ "/XS3s v"s  
 NOTIFYICONDATA data; e]X9"sd0=  
 data.cbSize=sizeof(NOTIFYICONDATA); &(^>}&XS.<  
 data.hWnd=GetSafeHwnd(); "Lpt@g[HF  
 data.uID=98; ZCJ8I  
 Shell_NotifyIcon(NIM_DELETE,&data); v:T` D  
 ShowWindow(SW_SHOW); 8UL:C?eY  
 SetForegroundWindow(); ;1OTK6  
 ShowWindow(SW_SHOWNORMAL); O,1u\Zy/  
 bTray=FALSE; VZlvmN  
} "AVj]jR  
k~?}z.g(  
void CCaptureDlg::OnChange() v <Ze$^ e&  
{ )J88gMk+  
 RegisterHotkey(); RBgkC+2  
} izW l5}+'B  
3S2'JOTY  
BOOL CCaptureDlg::RegisterHotkey() i+cGw  
{ K6oX nz}  
 UpdateData(); @x J^JcE  
 UCHAR mask=0; !V-SV`+X  
 UCHAR key=0; y<.!TULa_  
 if(m_bControl) 7<:w-  
  mask|=4; S@"=,Xj M  
 if(m_bAlt) ez5`B$$  
  mask|=2; ?H c A&  
 if(m_bShift) 246lFx G.  
  mask|=1; /+1Fa):  
  key=Key_Table[m_Key.GetCurSel()]; f"0H9  
 if(bRegistered){ Y@\5gZ&T  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =,]J"n8|v  
  bRegistered=FALSE; h5l Lb+  
 } 1W!n"3#  
 cMask=mask; 0 De M  
 cKey=key; mVL,J=2  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); A>g$[  
 return bRegistered; | uZ=S]V@  
} tr/dd&(Y1  
y?@Y\ b  
  四、小结 aC$g(>xFt  
B+DRe 8  
  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