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
  • 7974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: !`JHH&  
  O4 3YY2  
  一、实现方法 $q?$]k|M`  
Wm~` ~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: Dn9w@KO  
ocbB&  
#pragma data_seg("shareddata") @Hb'8F  
HHOOK hHook =NULL; //钩子句柄 fc=Patg  
UINT nHookCount =0; //挂接的程序数目 \`<cH#  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 .{KjEg 6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 `?g`bN`Vn  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey bu7'oB~:V^  
static int KeyCount =0; 2aZw[7s  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %_-zWVJ  
#pragma data_seg() 9h90huyKF  
#m{{a]zm^  
  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。 8M*PML4r  
rPNb\Ri  
  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: 63|+2-E2Q  
O%~jop7# 6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR `vG,}Pt]  
cKey,UCHAR cMask) d,vNem-Z*L  
{ h}_~y'^!  
 BOOL bAdded=FALSE; ?<&O0'Q  
 for(int index=0;index<MAX_KEY;index++){  kqYa*| l  
  if(hCallWnd[index]==0){ fA%z*\  
   hCallWnd[index]=hWnd; 3ya1'qUC  
   HotKey[index]=cKey; 5RH2"*8T  
   HotKeyMask[index]=cMask; k#Of]mXXz  
   bAdded=TRUE; s`j~-P  
   KeyCount++; ,21 np  
   break; <:/&&@2  
  } XIo55*  
 } enNiI$H]`_  
 return bAdded; 93qwH%  
} iB0WEj[?  
//删除热键 ,r^M?>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r"2V  
{ 7'-Lp@an  
 BOOL bRemoved=FALSE; 9j ]sD/L5q  
 for(int index=0;index<MAX_KEY;index++){ HmfG$Z  
  if(hCallWnd[index]==hWnd){ X:a`B(@S  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ N..j{FE  
    hCallWnd[index]=NULL; /yz=Cjoz  
    HotKey[index]=0; UtB6V)YI  
    HotKeyMask[index]=0; #*$P'r  
    bRemoved=TRUE; (iJ1 ;x  
    KeyCount--; 5J)=}e  
    break; (BxJryXm  
   } +MbIB&fRCB  
  } R3)57OyV  
 } [XRCLi}  
 return bRemoved; l+V,DCE  
} QVF]Ci_=  
"Td`AuP@,  
4nH*Ui!T  
  DLL中的钩子函数如下: `-`qdda  
!UOCJj.cA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [%50/_h  
{ kg][qn|>J]  
 BOOL bProcessed=FALSE; s]T""-He  
 if(HC_ACTION==nCode) l kyzNy9R  
 { Mypc3  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 &R|/t :DN  
   switch(wParam) fP tm0.r  
   {  &1l=X]%  
    case VK_MENU: IKMeJ(:S  
     MaskBits&=~ALTBIT; #j#_cImE  
     break; |py6pek|  
    case VK_CONTROL: uPYmHA} _/  
     MaskBits&=~CTRLBIT; gj\)CBOv  
     break; q#Zs\PD  
    case VK_SHIFT: ZvYLL{>}w  
     MaskBits&=~SHIFTBIT; j*e6 vX  
     break; mNf8kwr  
    default: //judge the key and send message E3@QI?n^^  
     break; {mWui9 %M  
   } }>^Q'BW;65  
   for(int index=0;index<MAX_KEY;index++){ *19ax&|*S  
    if(hCallWnd[index]==NULL) {7cX#1  
     continue; EM7+VO(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2oa#0`{  
    { %8*64T")  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); {GvTfZfp  
     bProcessed=TRUE; V._6=ZJ  
    } X1IeSMAe  
   } Eh-n  
  } +,o0-L1D  
  else if((lParam&0xc000ffff)==1){ //有键按下 <9=9b_z  
   switch(wParam) {QBB^px  
   { x}U8zt)yD3  
    case VK_MENU: ze_{=Cv&Y  
     MaskBits|=ALTBIT; Wv__ wZ  
     break; `28};B>  
    case VK_CONTROL: %}86D[PF  
     MaskBits|=CTRLBIT; M :3u@06a  
     break; ] 2DH;  
    case VK_SHIFT: $F.([?)k?  
     MaskBits|=SHIFTBIT; ELh8ltLY  
     break; -",=G\XZ  
    default: //judge the key and send message y%sroI('y  
     break; {k4CEt;  
   } UA[,2MBp  
   for(int index=0;index<MAX_KEY;index++){ r1ws1 rr=  
    if(hCallWnd[index]==NULL) wU#F_De)R:  
     continue; k>dsw:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^gV T$A  
    { 8Qh#)hiW!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $Vc~/>  
     bProcessed=TRUE; ut >4U'.H  
    } v7%X@j]ji  
   } t9&c E:n  
  } |AlR^N  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 yNm:[bOER  
   for(int index=0;index<MAX_KEY;index++){ Z5c~^jL$-  
    if(hCallWnd[index]==NULL) /h v4x9  
     continue; k3+e;[My+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >7!6nF3x,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tb :L\A^:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 %Pksv}  
   } l5+gsEux]  
  } izKfU?2]X@  
 } t_ksvWUo  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7?B.0>$3>V  
} o!:8nXw  
>5R <;#8  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: J$~<V IX  
_U;eN|Ww  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "cTncL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [-&L8Un  
7_2kDDW0  
  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: <foCb%$(?  
%>gW9}kB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #W.vX?-'0  
{ y=Mq(c:'UN  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) b':|uu*/  
 { 6#j$GH *  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 T#pk]c6Q  
  SaveBmp(); B?$ "\;&  
  return FALSE; j@Yi`a(sdm  
 } 0 ugT2%  
 …… //其它处理及默认处理 JT fd#g?I  
} <p;k)S2J  
mDh1>>K'~  
DmXcPJ[9  
  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。 R),zl_d_  
.1 %T W)  
  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。 pT?Q#,fh  
0A{/B/r   
  二、编程步骤 #YDr%>j  
UpXz&k  
  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"; \7"@RHcihB  
Ll MpS<2NO  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~2EHOO{  
e!fqXVEVR  
  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; 65ly2gl  
(M =Y&M'f  
  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; m]*Bx%-1c  
vK$"# F~  
  5、 添加代码,编译运行程序。 9dMrgz&'  
:';L/x>  
三、程序代码 cI]WrI2CQa  
Q-#$Aa  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL l{w#H|]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <8UYhGK  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ iYnEwAoN;  
#if _MSC_VER > 1000 ;,&8QcSVY  
#pragma once h;5LgAY|v  
#endif // _MSC_VER > 1000 iJnU%  
#ifndef __AFXWIN_H__ uP\lCqK,  
#error include 'stdafx.h' before including this file for PCH Pmi#TW3X  
#endif /~4 "No@  
#include "resource.h" // main symbols (;VVC Aoy  
class CHookApp : public CWinApp `Q+moX  
{ kj+#Tn F-  
 public: -T6(hT\  
  CHookApp(); CIjZG?A  
  // Overrides 'WHHc 9rG,  
  // ClassWizard generated virtual function overrides 8@NH%zWBp  
  //{{AFX_VIRTUAL(CHookApp) :Q+5,v-c  
 public: I ];M7  
  virtual BOOL InitInstance(); kP xa7  
  virtual int ExitInstance(); #k3t3az2{  
  //}}AFX_VIRTUAL 0?WcoPU  
  //{{AFX_MSG(CHookApp) +h2eqNr  
  // NOTE - the ClassWizard will add and remove member functions here. Y2o6kS{x  
  // DO NOT EDIT what you see in these blocks of generated code ! /ug8]Lo0  
  //}}AFX_MSG c`x7u}C  
  DECLARE_MESSAGE_MAP() +!f=jg06  
}; ( 6(x'ByT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); B= keBO](@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %LXM+<N8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "o& E2#  
BOOL InitHotkey(); 5 ,0d  
BOOL UnInit();  s95vK7I  
#endif DoC(Z)o  
>pkT1Z&'  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 3Rm#-T s  
#include "stdafx.h" d2X[(3  
#include "hook.h" V8=Y@T,  
#include <windowsx.h> C8a*Q"  
#ifdef _DEBUG +7Kyyu)y@  
#define new DEBUG_NEW ( *G\g=D  
#undef THIS_FILE M.h`&8  
static char THIS_FILE[] = __FILE__; *`( <'Z  
#endif T ^A b!O  
#define MAX_KEY 100  n6F/Ac:  
#define CTRLBIT 0x04 gBu1QviU  
#define ALTBIT 0x02 z9W`FBg  
#define SHIFTBIT 0x01 BF{w)=@/'  
#pragma data_seg("shareddata") 5q@LxDy,b  
HHOOK hHook =NULL; dk8wIa"K`  
UINT nHookCount =0; `ovtHl3Q  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey [nxE)D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 4Ij-Ilg)%  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey i?Ss:v^  
static int KeyCount =0; ,wwZI`>-  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift .s/fhk,  
#pragma data_seg() *9ywXm&?  
HINSTANCE hins; RkF D*E$  
void VerifyWindow(); u6:pV.p  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) HxK$4I`  
//{{AFX_MSG_MAP(CHookApp) 8\<jyJ  
// NOTE - the ClassWizard will add and remove mapping macros here. p}Fs'l?7Rq  
// DO NOT EDIT what you see in these blocks of generated code! wix5B@  
//}}AFX_MSG_MAP Li 2Zndp  
END_MESSAGE_MAP() 8#R?]Uwq  
sqx` ">R  
CHookApp::CHookApp() >#+IaKL7  
{ =Cqv=   
 // TODO: add construction code here, g%[n4  
 // Place all significant initialization in InitInstance /8@m<CW2Y  
} T5wjU*=IL  
EoX_KG{  
CHookApp theApp; +b;hBb]R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) W{XkV Ke1a  
{ +@X5!S6  
 BOOL bProcessed=FALSE; Z,N$A7SBE  
 if(HC_ACTION==nCode) 7iu Q9q^&  
 { w^K^I_2ge  
  if((lParam&0xc0000000)==0xc0000000){// Key up Q5S,{ ZeT  
   switch(wParam) &PcyKpyd  
   { ryO$6L  
    case VK_MENU: S)He$B$pp  
     MaskBits&=~ALTBIT; y0v]N  
     break; Oc9#e+_&  
    case VK_CONTROL: Ct$82J  
     MaskBits&=~CTRLBIT; wHz?#MW 3L  
     break; /EwGW  
    case VK_SHIFT: {>0V[c[~  
     MaskBits&=~SHIFTBIT; 33:DH}  
     break; /Tz85 [%6  
    default: //judge the key and send message `n!viW|tB  
     break; '%v#v3'  
   } Z.Rb~n&  
   for(int index=0;index<MAX_KEY;index++){ c*\<,n_  
    if(hCallWnd[index]==NULL) ~;-9X|  
     continue; 9?+9UlJ7K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <<MjC5  
    { I 5ag6l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _i}wK?n  
     bProcessed=TRUE; L{ gE'jCC  
    } {u7##Vrgt8  
   } $ &5w\P  
  } g1DmV,W-Q  
  else if((lParam&0xc000ffff)==1){ //Key down 8OWmzY_=  
   switch(wParam) $awi>#[  
   { oFg5aey4  
    case VK_MENU: 8U~.\`H-PT  
     MaskBits|=ALTBIT; yI:# |w|  
     break; B~r}c4R{7  
    case VK_CONTROL:  ]^"k8v/  
     MaskBits|=CTRLBIT; pw>m.=9|y  
     break; >L((2wfiN  
    case VK_SHIFT: cu#e38M&eE  
     MaskBits|=SHIFTBIT; bC@k>yC-  
     break; vnX  
    default: //judge the key and send message ~4.r^)\  
     break; tP ~zKU  
   } .M|>u_<Qd  
   for(int index=0;index<MAX_KEY;index++) f<[jwhCWV  
   { #*q2d  
    if(hCallWnd[index]==NULL) s #:%x#  
     continue; c yQ(fIYl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HgJb4Fi  
    { 'TN)Lb*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w=r&?{  
     bProcessed=TRUE; 2x$x; \*j  
    } L3y5a?G  
   } vTr34n  
  } A,i()R'I  
  if(!bProcessed){ t> Q{yw  
   for(int index=0;index<MAX_KEY;index++){ x49!{}  
    if(hCallWnd[index]==NULL) k/&]KYwu  
     continue; P1 +"v*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7r{qJ7$%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); kL{;.WsB  
   } T)u4S[ &  
  } s(@h 2:j  
 } f%^'P"R  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &R$Q\ ,  
} kv|,b  
_ P ,@  
BOOL InitHotkey() ^,s?e.u$8`  
{ g%J./F=@3  
 if(hHook!=NULL){ V: p)m&y6  
  nHookCount++; gqiXmMm:9  
  return TRUE; B5=3r1Ly  
 } ryD%i"g<  
 else 8q_0,>w%  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 1/j$I~B   
  if(hHook!=NULL) G^h_ YjR`*  
   nHookCount++; /MMtTB H  
  return (hHook!=NULL); DMgBcP  
} Hw_o w?  
BOOL UnInit() ^^Lj I  
{ ?_4^le[;  
 if(nHookCount>1){ Zy$Lrr!  
  nHookCount--; D(Ix!G/  
  return TRUE; #;j9}N  
 } i&tsYnP2  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 4_Rdp`x#J  
 if(unhooked==TRUE){ n`5WXpz4;  
  nHookCount=0; w-FnE}"l  
  hHook=NULL; ySX/=T:<;  
 } IlZu~B9c  
 return unhooked; IvU{Xm"qB  
} N)OCSeh  
UOI^c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [STje8+V  
{ 1t~({Pl<>  
 BOOL bAdded=FALSE; =3+L#P=i9  
 for(int index=0;index<MAX_KEY;index++){ l:e9y$_)  
  if(hCallWnd[index]==0){ q(9%^cV6  
   hCallWnd[index]=hWnd; 4 eh=f!(+  
   HotKey[index]=cKey; +t\^(SJ6  
   HotKeyMask[index]=cMask; sWxK~Yg  
   bAdded=TRUE; ?z.Isvn  
   KeyCount++; ofCVbn  
   break; P.4E{.)(  
  } g^lFML| %  
 } .j 'wQ+_  
 return bAdded; iz x[  
} J%P)%yX  
S=9E@(]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b~w KF0vq  
{ 'C]jwxy  
 BOOL bRemoved=FALSE; qzdaN5  
 for(int index=0;index<MAX_KEY;index++){ 3"i% {  
  if(hCallWnd[index]==hWnd){ z[ #6-T &  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ # cWHDRLX  
    hCallWnd[index]=NULL; ya>N.h  
    HotKey[index]=0; b.Su@ay@(^  
    HotKeyMask[index]=0; 0/A-#'>  
    bRemoved=TRUE; 2ij/N%l  
    KeyCount--; U>3 >Ex  
    break; .ev\M0Dt  
   } n&7@@@cA  
  } }u^:MI  
 } Ru7L>(Njs  
 return bRemoved; Yf (im  
} HTNA])G  
+{vQS FW  
void VerifyWindow() &q>h *w4O  
{ d=n h  
 for(int i=0;i<MAX_KEY;i++){ `QLowna  
  if(hCallWnd!=NULL){ '5WN,Vy8.  
   if(!IsWindow(hCallWnd)){ i+U51t<  
    hCallWnd=NULL; )kA2vX^=Z  
    HotKey=0; mVrKz  
    HotKeyMask=0; \]a uSO  
    KeyCount--; 9S"N4c>  
   } Gc}0]!nrW9  
  } "o==4?*L  
 } =tq7z =k  
} E3tj/4:L  
'}zT1F* p=  
BOOL CHookApp::InitInstance() *^6k[3VY  
{ nOuN|q=C  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 2mOfsn d@  
 hins=AfxGetInstanceHandle(); AO8:|?3S  
 InitHotkey(); T g\hx>  
 return CWinApp::InitInstance(); @ V5S4E  
} [Y oa"K  
Ltg-w\?]  
int CHookApp::ExitInstance() 7 s-`QdWX  
{ y[p6y[r*  
 VerifyWindow(); Bfn]-]>sD  
 UnInit(); CRd_}  
 return CWinApp::ExitInstance(); -&7=uRQk  
} e@+v9Bs]q  
Jmy)J!ib*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file y3AL)  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :+1bg&wQ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ JOgmF_(>Z  
#if _MSC_VER > 1000 f-s~Q 4  
#pragma once -g$O OJB6  
#endif // _MSC_VER > 1000 _X?y ,#  
z=%IcSx;  
class CCaptureDlg : public CDialog :%>oe> _"  
{ !xJFr6G~8  
 // Construction =%)})  
 public: @|]iSD&T #  
  BOOL bTray; h+ TB]  
  BOOL bRegistered; K9}jR@jy$  
  BOOL RegisterHotkey(); _we3jzMW  
  UCHAR cKey; ?9,YVylg  
  UCHAR cMask; jUZ[`f;  
  void DeleteIcon(); |y'b21 7t  
  void AddIcon(); u4C1W|x  
  UINT nCount; <JJkki  
  void SaveBmp(); h bdEw=r?  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &LwJ'h +nd  
  // Dialog Data iPNd!_  
  //{{AFX_DATA(CCaptureDlg) L c{!FG>  
  enum { IDD = IDD_CAPTURE_DIALOG }; zo87^y5?G  
  CComboBox m_Key; .0KOnLdK  
  BOOL m_bControl; Hc"N& %X[  
  BOOL m_bAlt; JH-nvv  
  BOOL m_bShift; krwf8!bI  
  CString m_Path; )*+u\x_Hx  
  CString m_Number; 0rGj|@+;  
  //}}AFX_DATA yCZ2^P!a  
  // ClassWizard generated virtual function overrides ]~ >@%v&  
  //{{AFX_VIRTUAL(CCaptureDlg) ?<g|.HY/  
 public: @s3aR*ny$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); bQ i<0|S  
 protected: @t "~   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y9/{0TArG  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); S]tkz*w0*  
  //}}AFX_VIRTUAL `7F@6n   
  // Implementation I"~xDa!  
 protected: +0SW ?#%  
  HICON m_hIcon; !;ZBL;qY9  
  // Generated message map functions r$Yh)rpt:  
  //{{AFX_MSG(CCaptureDlg) NH<Y1t  
  virtual BOOL OnInitDialog(); ?@yank|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); z`;&bg\8  
  afx_msg void OnPaint(); S/KVN(Z  
  afx_msg HCURSOR OnQueryDragIcon(); `f2W;@V0  
  virtual void OnCancel(); ;}n|,g>  
  afx_msg void OnAbout(); '[ @F%  
  afx_msg void OnBrowse(); Cbazwq  
  afx_msg void OnChange(); eR(\s_`  
 //}}AFX_MSG sf<Q#ieTxY  
 DECLARE_MESSAGE_MAP() Ixyvn#ux )  
}; Bd/} %4V\@  
#endif N,h1$)\B#  
AfuXu@UZ_/  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file nmTm(?yE  
#include "stdafx.h" zK[ 7:<  
#include "Capture.h" 5/zf x  
#include "CaptureDlg.h" fpI; `s  
#include <windowsx.h> >2 FAi.,  
#pragma comment(lib,"hook.lib") +.XZK3  
#ifdef _DEBUG Ks9FnDm8  
#define new DEBUG_NEW #_JA5W+E  
#undef THIS_FILE Qd 9-u)L<  
static char THIS_FILE[] = __FILE__; 6@*5! ,  
#endif M9g~lKs'  
#define IDM_SHELL WM_USER+1 cH+h=E=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .G7]&5s  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &?}kL= h  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 5B8V$ X  
class CAboutDlg : public CDialog TW'E99wG  
{ e4[-rkn{hl  
 public: {d&X/tT  
  CAboutDlg(); )er?*^9Z  
  // Dialog Data hP,b-R9\  
  //{{AFX_DATA(CAboutDlg) jsK|D{m?  
  enum { IDD = IDD_ABOUTBOX }; ]J8KCjq@  
  //}}AFX_DATA G5y]^P  
  // ClassWizard generated virtual function overrides 82G lbd)  
  //{{AFX_VIRTUAL(CAboutDlg) >DPds~k  
 protected: V:nMo2'hb  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *#ob5TBq[  
  //}}AFX_VIRTUAL 9;>@"e21R  
  // Implementation #rSasucr  
 protected: 61ON  
  //{{AFX_MSG(CAboutDlg) c+}!yH$  
  //}}AFX_MSG U)O?| VN^o  
  DECLARE_MESSAGE_MAP() Gp?ToS2^d  
}; Z%,\+tRe  
6\NX 5Gh  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 9~LpO>-  
{ {mCKTyN+  
 //{{AFX_DATA_INIT(CAboutDlg) +#de8/x  
 //}}AFX_DATA_INIT 8MYLXW6  
} zgEr,nF  
vkDZv@  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3I(dC|d  
{ ~`nm<   
 CDialog::DoDataExchange(pDX); /Bg6z m  
 //{{AFX_DATA_MAP(CAboutDlg) XhHel|!g:  
 //}}AFX_DATA_MAP Ba"^K d`  
} 'xLM>6[wz  
%J/fg<W1  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) bQ|#_/?  
 //{{AFX_MSG_MAP(CAboutDlg) M~d+HE   
 // No message handlers a2(D!_dZR  
 //}}AFX_MSG_MAP knNhN=hG+  
END_MESSAGE_MAP() T:w2  
L@gQ L  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 35]j;8N:  
: CDialog(CCaptureDlg::IDD, pParent) w~cq% %  
{ w /Bn2bD  
 //{{AFX_DATA_INIT(CCaptureDlg) Cg]3(3   
  m_bControl = FALSE; m11"i=S"  
  m_bAlt = FALSE; k"3Z@Px:  
  m_bShift = FALSE; zR3lX}g  
  m_Path = _T("c:\\"); PMz{8 F  
  m_Number = _T("0 picture captured."); >q} !>k$B  
  nCount=0; Z=e[ !c  
  bRegistered=FALSE; 41 c^\1  
  bTray=FALSE; mK7^:(<.LO  
 //}}AFX_DATA_INIT }(f.uN_v  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 gLXvw]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); !9e\O5PmO  
} FthXFxwx$  
LP0;n\  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~I/>i&|M1  
{ $ly#zQR  
 CDialog::DoDataExchange(pDX); <ZHY3  
 //{{AFX_DATA_MAP(CCaptureDlg) lzr>WbM{{p  
  DDX_Control(pDX, IDC_KEY, m_Key); :$GL.n-?  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); RJ=c[nb  
  DDX_Check(pDX, IDC_ALT, m_bAlt); wM2)KM}$  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); OTNZ!U/)j  
  DDX_Text(pDX, IDC_PATH, m_Path); Hz!U_?  
  DDX_Text(pDX, IDC_NUMBER, m_Number); qJbhPY8Ak  
 //}}AFX_DATA_MAP [i<$ZP  
} 8a":[Q[  
f2R+5`$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) -Z/6;2Q  
//{{AFX_MSG_MAP(CCaptureDlg) laD.or  
 ON_WM_SYSCOMMAND() & 8:iB {n  
 ON_WM_PAINT() [`Qp;_K?t  
 ON_WM_QUERYDRAGICON() Gct&}]3pm  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0%q ctZy  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) YP .%CD(K  
 ON_BN_CLICKED(ID_CHANGE, OnChange) VAF:Z  
//}}AFX_MSG_MAP R.T?ZF  
END_MESSAGE_MAP() ki*79d"$  
"I}'C^gP  
BOOL CCaptureDlg::OnInitDialog() Y|x6g(b  
{ YfrTvKX  
 CDialog::OnInitDialog(); Gg3?2h"d  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0?&aV_:;X  
 ASSERT(IDM_ABOUTBOX < 0xF000); a\[fC=]r:  
 CMenu* pSysMenu = GetSystemMenu(FALSE); mNBpb}  
 if (pSysMenu != NULL) x jP" 'yU  
 { +lDGr/  
  CString strAboutMenu; NBbY## w0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @tjZvRtZ  
  if (!strAboutMenu.IsEmpty()) %xbz&'W,  
  { &ls!IN  
   pSysMenu->AppendMenu(MF_SEPARATOR); 7Y @=x#  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )l[7;ZIw$  
  } Vbqm]2o&  
 } 1=o(sIeA  
 SetIcon(m_hIcon, TRUE); // Set big icon 3' :[i2[  
 SetIcon(m_hIcon, FALSE); // Set small icon Bgo"JNM  
 m_Key.SetCurSel(0); -f|+  
 RegisterHotkey(); ( F"& A?  
 CMenu* pMenu=GetSystemMenu(FALSE); ^RF mRn  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); v%l|S{>(  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +hKPOFa'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); fAY2V%Rft  
 return TRUE; // return TRUE unless you set the focus to a control [ ;3EzZL  
} $.3CiM }~  
z*k 3q`=>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Ie`SWg*WL  
{ Y(G*Yi?;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) O7<V@GL+  
 { C Sk  
  CAboutDlg dlgAbout; >{LJ#Dc6  
  dlgAbout.DoModal(); m|?" k38  
 } 5@%=LPV  
 else 4~pO>6P   
 { /kviO@jm4(  
  CDialog::OnSysCommand(nID, lParam); BB73' W8y  
 } R2H\;N  
} ^) b7m  
8L9S^ '  
void CCaptureDlg::OnPaint() D^R! |K/  
{ b09#+CH?  
 if (IsIconic()) |\r\i&|g1  
 { L+0N@`nRF  
  CPaintDC dc(this); // device context for painting l<)JAT;P  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); zk^7gx3x  
  // Center icon in client rectangle ow>[#.ua  
  int cxIcon = GetSystemMetrics(SM_CXICON); tB(X`A.|  
  int cyIcon = GetSystemMetrics(SM_CYICON); pQgOT0f  
  CRect rect; /wCxf5q0  
  GetClientRect(&rect); ?H7p6m u  
  int x = (rect.Width() - cxIcon + 1) / 2; ?;.+A4  
  int y = (rect.Height() - cyIcon + 1) / 2; dE9aE#o  
  // Draw the icon {*=5qV}  
  dc.DrawIcon(x, y, m_hIcon); C7*Yg$`{  
 } B=RKi\K6a  
 else J<P/w%i2  
 { @1qUC"Mg  
  CDialog::OnPaint(); t"74HZO >  
 } MT#[ - M\  
} 8KdcLN@  
 d7-F&!sQ  
HCURSOR CCaptureDlg::OnQueryDragIcon() aid)q&AcQ  
{ 5A=xFj{  
 return (HCURSOR) m_hIcon; !E>3N:  
} "F.J>QBd  
O 9 Au =  
void CCaptureDlg::OnCancel() HIp {< M3  
{ Rx"VscB6z  
 if(bTray) fS$Yl~-m?  
  DeleteIcon(); $;`2^L  
  CDialog::OnCancel(); U-^S<H  
} P@T $6%~  
/7HIL?r  
void CCaptureDlg::OnAbout() Y<$"]@w  
{ zZ"')+7q&%  
 CAboutDlg dlg; wCEfR!i  
 dlg.DoModal(); ~[X:twidkL  
} Z(`K6`KM  
Z_ *ZUN?B  
void CCaptureDlg::OnBrowse() w7ABnX  
{ K/LaA4  
 CString str; =VI`CBQ/Um  
 BROWSEINFO bi; h^,YYoA$  
 char name[MAX_PATH]; d5W[A#}  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); I:2jwAl  
 bi.hwndOwner=GetSafeHwnd(); Q]koj!mMl  
 bi.pszDisplayName=name; O7_NXfh|  
 bi.lpszTitle="Select folder"; K]azUK7  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; }j<_JI  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #(}_2x5  
 if(idl==NULL) b:d.Lf{y7  
  return; { dx yBDK  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )UU6\2^  
 str.ReleaseBuffer(); &(U=O?r7  
 m_Path=str; Ita!07  
 if(str.GetAt(str.GetLength()-1)!='\\') M(f*hOG{Y  
  m_Path+="\\"; / z>8XM&  
 UpdateData(FALSE); rO >wX_  
} |`9zE]  
a{YVz\?d}  
void CCaptureDlg::SaveBmp() R$'nWzX#  
{ sBG(CpQ  
 CDC dc; Rn ^N+3o'M  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Mh B=+S[@  
 CBitmap bm; ?=o]Wx0(9  
 int Width=GetSystemMetrics(SM_CXSCREEN); HOI`F3#XI  
 int Height=GetSystemMetrics(SM_CYSCREEN); sN/Xofh  
 bm.CreateCompatibleBitmap(&dc,Width,Height); '$nGtB5  
 CDC tdc; -kS5mR  
 tdc.CreateCompatibleDC(&dc); T//+&Sk[  
 CBitmap*pOld=tdc.SelectObject(&bm); /]58:euR  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); G!lykk]  
 tdc.SelectObject(pOld); /u1zRw  
 BITMAP btm; GnHf9 JrR  
 bm.GetBitmap(&btm); W${sD|d-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; BHBR_7  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); n6+M qN  
 BITMAPINFOHEADER bih; 8pKPbi;(2  
 bih.biBitCount=btm.bmBitsPixel; !LSWg:Ev+  
 bih.biClrImportant=0; |&*rSp2iH  
 bih.biClrUsed=0; $f-pLF+x  
 bih.biCompression=0; e/~<\  
 bih.biHeight=btm.bmHeight; wA+4:CF @  
 bih.biPlanes=1; VFp)`+8  
 bih.biSize=sizeof(BITMAPINFOHEADER); QLLV OJi  
 bih.biSizeImage=size; Tfs9< k>G#  
 bih.biWidth=btm.bmWidth; ,(b~L<zN&  
 bih.biXPelsPerMeter=0; Z?[J_[ZtR3  
 bih.biYPelsPerMeter=0; Xst}tz62F  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +K4v"7C V  
 static int filecount=0; ^HKaNk<  
 CString name; _'v )Fy  
 name.Format("pict%04d.bmp",filecount++); ol>=tk 8}  
 name=m_Path+name; 6EGEwx  
 BITMAPFILEHEADER bfh; 3Jit2W4  
 bfh.bfReserved1=bfh.bfReserved2=0; Xq$0% WjG  
 bfh.bfType=((WORD)('M'<< 8)|'B'); c=mFYsSv  
 bfh.bfSize=54+size; 4h@of'  
 bfh.bfOffBits=54; g5]DA.&(  
 CFile bf; u9%:2$[  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \3UdC{~  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5WX2rJ8z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); BbhdGFG1  
  bf.WriteHuge(lpData,size); 6iS+3+  
  bf.Close(); V#FLxITk  
  nCount++;  +PD5pr  
 } XX;%:?n  
 GlobalFreePtr(lpData); m=y)i]=1  
 if(nCount==1) ?|F;x"  
  m_Number.Format("%d picture captured.",nCount); N1t:i? q&  
 else je0 ?iovY  
  m_Number.Format("%d pictures captured.",nCount); pfIvBU?  
  UpdateData(FALSE); KWkT 9[H  
} ~#xRoBy3  
Fsdn2{g8U  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !T1i_  
{ $ :P~21,  
 if(pMsg -> message == WM_KEYDOWN) cA^7}}?e  
 { XBBRB<l)  
  if(pMsg -> wParam == VK_ESCAPE) 0 N^V&k   
   return TRUE; ?Io2lFvI@Y  
  if(pMsg -> wParam == VK_RETURN) L 3Iz]D3s  
   return TRUE; {=Y&q~:8v  
 } Lf<9GYNy>`  
 return CDialog::PreTranslateMessage(pMsg); $t?e=#G  
} e1a%Rj~  
U%olH >1K  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?^0Z(<Arz  
{ j|w+=A1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 27gm_ *  
  SaveBmp(); {RO=4ba{J  
  return FALSE; &}?e:PEy  
} nhxl#  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ tt91)^GdYa  
 CMenu pop; od|.E$B  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); vDL/PXNC  
 CMenu*pMenu=pop.GetSubMenu(0); sRG3`>1  
 pMenu->SetDefaultItem(ID_EXITICON); smNr%}_g  
 CPoint pt; ZaV@}=Rd8  
 GetCursorPos(&pt); w|ei*L  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); [!$>:_Vq/  
 if(id==ID_EXITICON) c }cboe2  
  DeleteIcon(); <;K/Yv'{r  
 else if(id==ID_EXIT) x F#)T *  
  OnCancel(); w, wt<@}  
 return FALSE; WNi<|A#T{  
}  #pK)  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Sn,z$-;h;  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) z AIC5fvu  
 AddIcon(); S^.=j oI  
 return res; YEj U3^@  
} 'LI)6;Yc  
mLqm83  
void CCaptureDlg::AddIcon()  O@$i  
{ C\[UAxZ3X  
 NOTIFYICONDATA data; &kE|~i:=,9  
 data.cbSize=sizeof(NOTIFYICONDATA); C?J%^?v  
 CString tip; hkxZ=l  
 tip.LoadString(IDS_ICONTIP); bL%)k61G_v  
 data.hIcon=GetIcon(0); t$2{U  
 data.hWnd=GetSafeHwnd(); R&p53n  
 strcpy(data.szTip,tip); CSs6Vm!=  
 data.uCallbackMessage=IDM_SHELL; :4TcCWG  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; t~M_NEPxV  
 data.uID=98; $P~a   
 Shell_NotifyIcon(NIM_ADD,&data); NI)nf;C  
 ShowWindow(SW_HIDE); %mJ)pMV  
 bTray=TRUE; }mK_d9dx  
} 4#uoPkLK  
o%iTYR :x  
void CCaptureDlg::DeleteIcon() !{LwX Kf  
{ PGDlSB^O  
 NOTIFYICONDATA data; k[m-"I%ZFX  
 data.cbSize=sizeof(NOTIFYICONDATA); Y_B( R  
 data.hWnd=GetSafeHwnd(); o\#e7Hqbh  
 data.uID=98; u8QX2|  
 Shell_NotifyIcon(NIM_DELETE,&data); "M]]H^r5  
 ShowWindow(SW_SHOW); `pr,lL  
 SetForegroundWindow(); Z$@Nzza-  
 ShowWindow(SW_SHOWNORMAL); I`l< }M  
 bTray=FALSE; hGLBFe#3  
} dX*PR3I-3  
!k) ?H* ^@  
void CCaptureDlg::OnChange() ~Gza$ K  
{ *np|PyLP:  
 RegisterHotkey(); 'u~use"  
} ty ?y&~axk  
AmHIG_'  
BOOL CCaptureDlg::RegisterHotkey() jw)t"S/E  
{ >?tpGEZ\  
 UpdateData(); inPGWG K]  
 UCHAR mask=0; v>6r|{  
 UCHAR key=0; t s&C0  
 if(m_bControl) Y`v&YcX;  
  mask|=4; %!RQ:?=  
 if(m_bAlt) n@f@-d$m\<  
  mask|=2; RY&~{yl$"1  
 if(m_bShift) 5{UGSz 1  
  mask|=1; GzX@Av$  
  key=Key_Table[m_Key.GetCurSel()]; S6uBk"V!  
 if(bRegistered){ lK0coj1+  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); z!tHn#  
  bRegistered=FALSE; t<-Iiq+tL  
 } $= gv  
 cMask=mask; d>f5T l\E  
 cKey=key; ~rD* Y&#.  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); I`7[0jA~  
 return bRegistered; MLl:)W*  
} pmZr<xs   
xfilxd  
  四、小结 \BA_PyS?W+  
(Y%}N(Jg  
  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