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
  • 4810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: P*kC>lvSv  
  D>K=D"  
  一、实现方法 /086qB|  
1p(9hVA  
  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: ,pa=OF  
I1!m;5-c9k  
#pragma data_seg("shareddata") TFtD>q X  
HHOOK hHook =NULL; //钩子句柄 |4F'Zu}g>  
UINT nHookCount =0; //挂接的程序数目 )0{ZZ-beG  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 zOMU&;.\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 "^5%g%  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey h F *c  
static int KeyCount =0; og|~:>FmJo  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 d.p%jVO)"  
#pragma data_seg() K"VRHIhfg  
W4:#=.m  
  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。 \(ju0qFqH  
9/6=[)  
  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: S0tPnwco[~  
|\SwZTr  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Hs(U|BXU  
cKey,UCHAR cMask) ^ 4{"h  
{ >:f&@vwm  
 BOOL bAdded=FALSE; =yLJGNK[  
 for(int index=0;index<MAX_KEY;index++){ ?Z"<&tsZ  
  if(hCallWnd[index]==0){ f9La79v  
   hCallWnd[index]=hWnd; P30|TU+B  
   HotKey[index]=cKey; 2g%p9-MO]I  
   HotKeyMask[index]=cMask; fnn /akGKI  
   bAdded=TRUE; tQcn%CK  
   KeyCount++; '%[r9 w  
   break; 3zo:)N \K  
  } nSB@xP#&  
 } 4i(?5p>f  
 return bAdded; gt Rs||  
} "$PX [:  
//删除热键 0 LIRi%N5*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *[b22a4H(  
{ lAo S 9w  
 BOOL bRemoved=FALSE; &v<Am%!N  
 for(int index=0;index<MAX_KEY;index++){ utBKl' `  
  if(hCallWnd[index]==hWnd){ o/mGd~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %q_b\K  
    hCallWnd[index]=NULL; ]% I|C++0  
    HotKey[index]=0;  El |Y]f  
    HotKeyMask[index]=0; eX <@qa4<  
    bRemoved=TRUE; >m8~Fs0  
    KeyCount--; Qk`LBvg1  
    break; .?*TU~S  
   } ,w0Io   
  } "E%3q3|"l  
 } :x36Z4:  
 return bRemoved; `E-cf7%  
} 's 'H&sa  
\Ea(f**2B  
[ .c'22R6  
  DLL中的钩子函数如下: {qL}:ha?  
C^nTLw;K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) > PONu]^  
{ {=<m^ 5b9  
 BOOL bProcessed=FALSE; +~eybm;  
 if(HC_ACTION==nCode) MNd[Xzm  
 { zoHFTD4 g  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 8 ;o*c6+  
   switch(wParam) (bON[6OGm  
   {  y(*#0fJrTV  
    case VK_MENU: CyD)=e {  
     MaskBits&=~ALTBIT; S F&EVRv  
     break; 0:q R,NW^#  
    case VK_CONTROL: Rg~F[j$N  
     MaskBits&=~CTRLBIT; zE1=*zO`  
     break; <K  GYwLk  
    case VK_SHIFT: 2~RG\JWTA  
     MaskBits&=~SHIFTBIT; 7V-'><)gI  
     break; Bf{c4YiF  
    default: //judge the key and send message d0D*S?#8,C  
     break; )jHH-=JM  
   } gMUCVKGf  
   for(int index=0;index<MAX_KEY;index++){ %3mh'Z -[f  
    if(hCallWnd[index]==NULL) jC_m0Iwc  
     continue; <U~at+M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m+9~f_}  
    { n5;>e&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B8.uzX'p  
     bProcessed=TRUE; ,@0D_&JAl  
    } D%!GY1wdn  
   } wi@Qf6(mn  
  } SCo;Ek  
  else if((lParam&0xc000ffff)==1){ //有键按下 nV3I6  
   switch(wParam) f&NXWo/  
   { yNOoAnGT W  
    case VK_MENU: bW^JR,  
     MaskBits|=ALTBIT; 9#b/D&pX5  
     break; ky=h7#wdv-  
    case VK_CONTROL: !?5YXI,  
     MaskBits|=CTRLBIT; }B@44HdY  
     break; G*%:"qleT$  
    case VK_SHIFT: !"<~n-$B  
     MaskBits|=SHIFTBIT; SmVL?wf  
     break; ?z0N- A2C2  
    default: //judge the key and send message e]-%P(}Z  
     break; /a?qtRw  
   } ]..7t|^b&  
   for(int index=0;index<MAX_KEY;index++){ *I9O+/,  
    if(hCallWnd[index]==NULL) ,v_NrX=f?  
     continue; ")@#B=8+3^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U6F1QLSLz  
    { M$UZn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); VCQo3k5 {  
     bProcessed=TRUE; \h5!u1{L  
    } ug^esB  
   } qrufnu5cC  
  } 52t6_!y+V  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 lb\VQZp!y  
   for(int index=0;index<MAX_KEY;index++){ Kjt\A]R%  
    if(hCallWnd[index]==NULL) frT<9$QUL  
     continue; #eIFRNRb)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~|( eh9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); KvXF zx|A  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 vp(ow]Q  
   } U X%J?;g  
  } P7\?WN$p  
 } xQkvK=~$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K/M2L&C  
} Dvm[W),(k  
.?kq\.rQ  
  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: N5.B"l  
]i\;#pj}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); e%C_>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ym_p49  
Z):Nd9  
  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: i!EAs`$o`  
qKTzigjj  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) U=PTn(2  
{ v UhgM'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) e, fZ>EJ  
 { )Z)Gb~G  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 0o!mlaU#  
  SaveBmp(); }=Ul8 <  
  return FALSE; .3&( Y  
 } |}b~YHTs  
 …… //其它处理及默认处理 -e"A)Bpl(  
} h"nhDART<  
DTG-R>y^  
S%aup(wu6  
  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。 EjMVlZC>  
xpc{#/Nk  
  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。 -Nn< pq  
Ft38)T"2R\  
  二、编程步骤 zwz_K!229  
5?Pf#kq  
  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"; xkv%4H>  
L9-Jwy2(>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; HQ]mDo  
huW,kk<]y  
  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; "$pbK:  
5z =}o/?  
  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; ka6E s~  
[!4xInS  
  5、 添加代码,编译运行程序。 VXW*LEk  
hz*T"HJ]t  
三、程序代码 wl&T9O;?  
AUu<@4R7  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL XwFTAaZ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) &,yF{9$G  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ +3J<vM}dy  
#if _MSC_VER > 1000 uVKe?~RC  
#pragma once bN7m[GRO.  
#endif // _MSC_VER > 1000 TW!OE"B  
#ifndef __AFXWIN_H__ {Wi*B(  
#error include 'stdafx.h' before including this file for PCH y0`; br\X  
#endif j1A%LS;c_  
#include "resource.h" // main symbols qS9<_if2  
class CHookApp : public CWinApp Il Qk W<  
{ Cf9{lhE8  
 public: FzcXSKHV %  
  CHookApp(); rZ|p{ym  
  // Overrides Wy}^5]R0E  
  // ClassWizard generated virtual function overrides o$eCd{HuX  
  //{{AFX_VIRTUAL(CHookApp) #4./>}G  
 public: qxDMDMN  
  virtual BOOL InitInstance(); :"MHmm=uU8  
  virtual int ExitInstance(); 3}!u8,P  
  //}}AFX_VIRTUAL ' tY(&&  
  //{{AFX_MSG(CHookApp) G;flj}z  
  // NOTE - the ClassWizard will add and remove member functions here. `FQ]ad Fz  
  // DO NOT EDIT what you see in these blocks of generated code ! pZ}B/j  
  //}}AFX_MSG Ln2FG4{  
  DECLARE_MESSAGE_MAP() ch :rAx  
}; ?&;_>0P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); zWhj >Za  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -fk;Qq3O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cM3B5Lp  
BOOL InitHotkey(); 9?MzIt  
BOOL UnInit(); `-.2Z 0  
#endif `WN80d\)&  
Y|><Ls6Q  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. X!K>.r_Dg  
#include "stdafx.h" VC/-5'_6  
#include "hook.h" %jy$4qAf%  
#include <windowsx.h> r'jUB^E  
#ifdef _DEBUG l=p_  
#define new DEBUG_NEW :MY=Q]l  
#undef THIS_FILE _%=CW' B  
static char THIS_FILE[] = __FILE__;  ?bVIH?  
#endif /0H}-i  
#define MAX_KEY 100 ,wes*  
#define CTRLBIT 0x04 y ;Cs#eo  
#define ALTBIT 0x02 Ba8=nGa4KY  
#define SHIFTBIT 0x01 %L*EB;nK  
#pragma data_seg("shareddata") l;0([_>*j  
HHOOK hHook =NULL; #i@f%Bq-  
UINT nHookCount =0; / Qd` ?  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey O&BvWik  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ,\iHgsZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey tngB;9c+w  
static int KeyCount =0; M%`CzCL u  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift i,r:R g~  
#pragma data_seg() cVW7I  
HINSTANCE hins; %S;AM\o4  
void VerifyWindow(); <[)-Q~Gg5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 0>Snps3*Z  
//{{AFX_MSG_MAP(CHookApp) s{Qae=$Q  
// NOTE - the ClassWizard will add and remove mapping macros here. N'VTdf?  
// DO NOT EDIT what you see in these blocks of generated code! ZI!:  
//}}AFX_MSG_MAP 4F|79U #  
END_MESSAGE_MAP() ?'6@m86d  
}x`Cnn  
CHookApp::CHookApp() {WrEe7dLy  
{ O|,9EOrP  
 // TODO: add construction code here, NplyvjQN;  
 // Place all significant initialization in InitInstance >|A,rE^Ojt  
}  /RJ  
HK/WO jr  
CHookApp theApp; "jum*<QZz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) oYkd%N9P  
{ 9y*] {IY  
 BOOL bProcessed=FALSE; oL@-<;zKO  
 if(HC_ACTION==nCode) hU""YP ~y  
 { s) ]j X  
  if((lParam&0xc0000000)==0xc0000000){// Key up Dhn7N8(LF!  
   switch(wParam) _M`ZF*o=c  
   { 1z8"Gk6  
    case VK_MENU: &|Duc} t  
     MaskBits&=~ALTBIT; Y 3ApW vS  
     break; 'Nl hLu  
    case VK_CONTROL: -{cmi,oy  
     MaskBits&=~CTRLBIT; oN,1ig  
     break; V+"%BrM  
    case VK_SHIFT: Jr !BDg  
     MaskBits&=~SHIFTBIT; sr6 BC.  
     break; m>vwpRBOA  
    default: //judge the key and send message "V>}-G&  
     break; L5FOlzn  
   } mF;mJq<d  
   for(int index=0;index<MAX_KEY;index++){ k\#;  
    if(hCallWnd[index]==NULL) 2xLtJR4L  
     continue; @v lP)"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F<I*?${[  
    { }d?;kt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v@Uk% O/  
     bProcessed=TRUE; o%?)};o  
    } xx`YBn~"  
   } %1Q:{m  
  } 5I2,za&e  
  else if((lParam&0xc000ffff)==1){ //Key down \l:R]:w;ZI  
   switch(wParam) w{W+WJ  
   { !{jw!bB  
    case VK_MENU: TRm#H $  
     MaskBits|=ALTBIT; "#O9ij  
     break; d-~V.  
    case VK_CONTROL: 9!_,A d;3  
     MaskBits|=CTRLBIT; n= <c_a)Nb  
     break; eyMn! a  
    case VK_SHIFT: ;_bRq:!j;  
     MaskBits|=SHIFTBIT; '8;bc@cE  
     break; |!PL"]?  
    default: //judge the key and send message Mr)t>4  
     break; dS6 $  
   } H d|p@$I  
   for(int index=0;index<MAX_KEY;index++) 4^W!,@W  
   { 0/)2RmF  
    if(hCallWnd[index]==NULL) X hq ss),  
     continue; @Y/&qpo$#W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) PGP#$JC  
    { y47N(;vy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); . }\8Y=  
     bProcessed=TRUE; dkw.o.e  
    } lJdBUoO  
   } qk<jvha  
  } EQ$k^Y8 "  
  if(!bProcessed){ vS8& ,wJ!  
   for(int index=0;index<MAX_KEY;index++){ +7gd1^|$e  
    if(hCallWnd[index]==NULL)  cHvm  
     continue; 0>od1/`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) YCDH0M  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %nZ:)J>kz  
   } @U_ CnhPQq  
  } "TA0--6  
 } l5T[6C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); J#$U<`j*G  
} I}_}VSG(  
SZKYq8ZA)V  
BOOL InitHotkey() fxd+0R;f  
{ p*b_ "aF1  
 if(hHook!=NULL){ F}}!e.>c  
  nHookCount++; _qa]T'8  
  return TRUE; 2Xe1qzvo  
 } @s1T|}AJ  
 else {U;yW)  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ]Ucw&B* @  
  if(hHook!=NULL) xF[%R{Mn'  
   nHookCount++; WML--<dU  
  return (hHook!=NULL); ii?T:T@  
} U823q-x  
BOOL UnInit()  8oJl ]  
{ R;!,(l  
 if(nHookCount>1){ 4 . 7X*1  
  nHookCount--; _f^6F<!  
  return TRUE; wOf8\s1  
 } >`AK'K8{M  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 1b%Oi.;  
 if(unhooked==TRUE){ (F&LN!Hn>p  
  nHookCount=0; r-y;"h'  
  hHook=NULL; 3Z?ornS  
 } :(A&8<}-6  
 return unhooked; {5Bj*m5  
} 3Q$ 4`p;  
d^=)n-!T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r!&174DSR1  
{ !Aj}sh{  
 BOOL bAdded=FALSE; _RaE: )  
 for(int index=0;index<MAX_KEY;index++){ c]{}|2u  
  if(hCallWnd[index]==0){ Z^>4qf,k  
   hCallWnd[index]=hWnd; 1'o[9-  
   HotKey[index]=cKey; )NZH{G  
   HotKeyMask[index]=cMask; t"4* ]S  
   bAdded=TRUE; c]u ieig0~  
   KeyCount++; ?z.?(xZ 6  
   break; g[(@@TiG  
  } on 7 n4  
 } Q'n+K5&p  
 return bAdded; gkd4)\9  
} cANt7  
vL@<l^`$0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %j\&}>P4$  
{ &\ 9%;k  
 BOOL bRemoved=FALSE; 1O`V_d)  
 for(int index=0;index<MAX_KEY;index++){ )J[m>tyY5  
  if(hCallWnd[index]==hWnd){ 8H4NNj Oy  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;y,g%uqE  
    hCallWnd[index]=NULL; Ca'BE#q  
    HotKey[index]=0; :XhF:c[.:  
    HotKeyMask[index]=0; b,^ "-r  
    bRemoved=TRUE; D U\ytD`u  
    KeyCount--; Sh(ys*y>  
    break; dM;\)jm  
   } Wo "s;Z  
  } OWibmX  
 } NfClR HpVc  
 return bRemoved; 3Rb#!tx9  
} h}a}HabA  
R0qZxoo  
void VerifyWindow() h\[@J rDa  
{ )8C`EPe  
 for(int i=0;i<MAX_KEY;i++){ TnN yth wZ  
  if(hCallWnd!=NULL){ 7K.75%}  
   if(!IsWindow(hCallWnd)){ ~2k.x*$  
    hCallWnd=NULL; >1`4]%  
    HotKey=0; ]jD\4\M}  
    HotKeyMask=0; cjL)M=pIS  
    KeyCount--; L(yUS)O  
   } R Th=x.  
  } B<I(t"s  
 } W+a/>U  
} Zp/+F(  
<OEIG 0  
BOOL CHookApp::InitInstance() Z|C,HF+m.  
{ _G'ki.[S7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); F:m6Mf7L  
 hins=AfxGetInstanceHandle(); 9HJYrzf{%  
 InitHotkey(); J+t51B(a  
 return CWinApp::InitInstance(); c~tl0XU1  
} UK,bfLPt~  
/ ]8e[t>!f  
int CHookApp::ExitInstance() <\epj=OclV  
{ B}TY+@  
 VerifyWindow(); +\Vw:~e  
 UnInit(); \=WPJm`p  
 return CWinApp::ExitInstance(); kqKT>xo4EZ  
} w=XIpWl  
}ex4dhx2M  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file m+XHFU  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) v'?Smd1v /  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1\( N,'h  
#if _MSC_VER > 1000 b|-)p+ba  
#pragma once -m}'I8  
#endif // _MSC_VER > 1000 cRs.@U\{R\  
we _CF*zj  
class CCaptureDlg : public CDialog l1T`[2  
{ XB!qPh .  
 // Construction )K?7(H/j  
 public: #~'d Y\&  
  BOOL bTray; 9~`#aQG T  
  BOOL bRegistered; 6MM\nIU)/  
  BOOL RegisterHotkey(); 2n3&uvf'TL  
  UCHAR cKey; 'nPI zK<v  
  UCHAR cMask; C')KZ|JIC  
  void DeleteIcon(); 8TpYt)]S  
  void AddIcon(); \2; !}  
  UINT nCount; +- qk\sQ  
  void SaveBmp(); |kh{EUE ;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor )A*53>JV  
  // Dialog Data a0)w/A&  
  //{{AFX_DATA(CCaptureDlg) 4*Hzys[{  
  enum { IDD = IDD_CAPTURE_DIALOG }; &S xF"pYV  
  CComboBox m_Key; j~Pw t9G  
  BOOL m_bControl; sDBSc:5+e  
  BOOL m_bAlt; gw"SKp!]  
  BOOL m_bShift; H_@6!R2  
  CString m_Path; xGyl7$J  
  CString m_Number; m7i_ Iv  
  //}}AFX_DATA c/88|k  
  // ClassWizard generated virtual function overrides !2Ompcr1  
  //{{AFX_VIRTUAL(CCaptureDlg) A5F (-  
 public: GXm#\)  
  virtual BOOL PreTranslateMessage(MSG* pMsg); f|(9+~K/7&  
 protected: ;76+J)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,sSo\%  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >{ {ds--  
  //}}AFX_VIRTUAL ].d%R a:{  
  // Implementation rD21:1s  
 protected: '^m'r+B"  
  HICON m_hIcon; oUsfO-dET^  
  // Generated message map functions oJNQdW[  
  //{{AFX_MSG(CCaptureDlg) ZRYlm$C  
  virtual BOOL OnInitDialog(); ]#4kqj}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); xO:h[  
  afx_msg void OnPaint(); jMBM qQNU  
  afx_msg HCURSOR OnQueryDragIcon(); } Ifa5Lq)  
  virtual void OnCancel(); F|6"-*[RS  
  afx_msg void OnAbout(); h0m5o V  
  afx_msg void OnBrowse(); /-!Fr:Ox>  
  afx_msg void OnChange(); evZP*N~G  
 //}}AFX_MSG xU%]G .k  
 DECLARE_MESSAGE_MAP() @su<_m6'  
}; ,<+:xl   
#endif DjaXJ?'  
m$W2E.-$'#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file c.1gQy$}|  
#include "stdafx.h" lIEZ=CEmY  
#include "Capture.h" O7IYg;  
#include "CaptureDlg.h" $-]G6r  
#include <windowsx.h> a ub$4n!C9  
#pragma comment(lib,"hook.lib") kD+#|f  
#ifdef _DEBUG NUb$PT  
#define new DEBUG_NEW >pZ _  
#undef THIS_FILE q]f7D\ M  
static char THIS_FILE[] = __FILE__; J ?aJa  
#endif EP;ts  
#define IDM_SHELL WM_USER+1 <,p$eQ)T%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); < ~CY?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &FRf-6/  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};  ^F?B_'  
class CAboutDlg : public CDialog $ #/8l58  
{ n(z$u)Y  
 public: ^y ', l  
  CAboutDlg(); d< XY"Y%  
  // Dialog Data Pl|I{l*o(`  
  //{{AFX_DATA(CAboutDlg) xS/=9l/G  
  enum { IDD = IDD_ABOUTBOX }; MY\mo,#  
  //}}AFX_DATA [-#1;!k  
  // ClassWizard generated virtual function overrides _"D J|j  
  //{{AFX_VIRTUAL(CAboutDlg) $A74V [1^  
 protected: <l,e6K  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support hx%UZ<a  
  //}}AFX_VIRTUAL B ( h`~pb  
  // Implementation . P 44t  
 protected: 8KP   
  //{{AFX_MSG(CAboutDlg) MwD+'5   
  //}}AFX_MSG vm*9xs  
  DECLARE_MESSAGE_MAP() JSh'iYJ .  
}; ^cW{%R>XY  
/ L$q8+  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) LfrjC@_y  
{ v(O@~8(I  
 //{{AFX_DATA_INIT(CAboutDlg) JKp@fQT *  
 //}}AFX_DATA_INIT @:'E9J06  
} >4>. Ycp  
MD1d  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #/`MYh=!W  
{ uY3$nlhP6  
 CDialog::DoDataExchange(pDX); WpI5C,3Z!l  
 //{{AFX_DATA_MAP(CAboutDlg) ou|3%&*"  
 //}}AFX_DATA_MAP [A!=Hv_$  
} \n#l+R23  
 q _;#EV  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) aeLIs SEx  
 //{{AFX_MSG_MAP(CAboutDlg) fB; o3!y  
 // No message handlers 2j>C4Ck  
 //}}AFX_MSG_MAP I.6#>=  
END_MESSAGE_MAP() UU =,Brb  
_#P5j#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) {;UBW7{  
: CDialog(CCaptureDlg::IDD, pParent) 1*@Q~f:Uk  
{ mp]UUpt  
 //{{AFX_DATA_INIT(CCaptureDlg) 5oD%~Fk l  
  m_bControl = FALSE; aJNsJIY+  
  m_bAlt = FALSE; ,n5 [Y)  
  m_bShift = FALSE; q*J-ii  
  m_Path = _T("c:\\"); 7.^1I7O  
  m_Number = _T("0 picture captured."); "0"8Rp&V|  
  nCount=0; 97 !VH> MX  
  bRegistered=FALSE; g'eJN  
  bTray=FALSE; LTD;  
 //}}AFX_DATA_INIT ? v@q&  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 a)L=+Z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); O >&,h^  
} 1\,wV,  
dI8y}EbE~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) TlBu3z'P  
{ KI<Vvc m  
 CDialog::DoDataExchange(pDX); T^ah'WmNw  
 //{{AFX_DATA_MAP(CCaptureDlg) j~9,Ct  
  DDX_Control(pDX, IDC_KEY, m_Key); Tq.%_/@M<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); [SLBA_d  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ?K?v64[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); k{$Mlt?&-  
  DDX_Text(pDX, IDC_PATH, m_Path); {5:V hW}  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9o5_QnGE  
 //}}AFX_DATA_MAP #T)gKp  
} !g-19at  
2KmPZ&r  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) (svd~he2  
//{{AFX_MSG_MAP(CCaptureDlg) V$ss[fX  
 ON_WM_SYSCOMMAND() BcTV5Wcr  
 ON_WM_PAINT() )%5T*}j  
 ON_WM_QUERYDRAGICON() =}AwA5G  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) GwVSRI:[N  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) HPR*:t  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ]hkway  
//}}AFX_MSG_MAP ddD $ 4+  
END_MESSAGE_MAP() ! =c&U.B  
D Psf]  
BOOL CCaptureDlg::OnInitDialog() S}*%l)vfR  
{ y/@.T\p  
 CDialog::OnInitDialog(); !M&B=vk4  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); d6k`=Hlg  
 ASSERT(IDM_ABOUTBOX < 0xF000); O8:,XTAN  
 CMenu* pSysMenu = GetSystemMenu(FALSE); f)+fdc  
 if (pSysMenu != NULL) fOyLBixR  
 { Ge;plD-f  
  CString strAboutMenu; P1 `-OM  
  strAboutMenu.LoadString(IDS_ABOUTBOX); J5Tl62}  
  if (!strAboutMenu.IsEmpty()) B/CP/Pfb  
  { ^CwzA B  
   pSysMenu->AppendMenu(MF_SEPARATOR); d98ZC+q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8V(#S :G35  
  } GZ]; U] _  
 } hQfxz,X  
 SetIcon(m_hIcon, TRUE); // Set big icon r`L$[C5I  
 SetIcon(m_hIcon, FALSE); // Set small icon K G~fDb  
 m_Key.SetCurSel(0); g.N~81A  
 RegisterHotkey(); b&Sk./ J6  
 CMenu* pMenu=GetSystemMenu(FALSE); _6 ~/`_(KP  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  3y?ig2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `1KZ14K  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); h30~2]hH  
 return TRUE; // return TRUE unless you set the focus to a control s Hu~;)  
} +S:(cz80V  
dt  4_x1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) j%KLp4J/e  
{ :r[`bqC;\*  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) #{l+I( M  
 { ![iAALPNl  
  CAboutDlg dlgAbout; #]|9aVrr  
  dlgAbout.DoModal(); TUiXE~8=  
 } (+9_nAgZ,  
 else R gEKs"e  
 { GjA;o3(  
  CDialog::OnSysCommand(nID, lParam); % j7lLSusX  
 } ^=wG#!#V"1  
} ;#!`c gAh  
=1%3". "n@  
void CCaptureDlg::OnPaint() Ajhrsa\~a  
{ '@Y@H,  
 if (IsIconic()) #oi4!%*M  
 { gR(*lXm5w  
  CPaintDC dc(this); // device context for painting LeY\{w  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); oG5JJpLT  
  // Center icon in client rectangle yKa}U!$   
  int cxIcon = GetSystemMetrics(SM_CXICON); #T n~hnW  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2HMlh.R(C  
  CRect rect; LC\Ys\/,U  
  GetClientRect(&rect); lyx p:  
  int x = (rect.Width() - cxIcon + 1) / 2; 7+j@0v\  
  int y = (rect.Height() - cyIcon + 1) / 2; +tOBt("5/  
  // Draw the icon gNzQ"W=  
  dc.DrawIcon(x, y, m_hIcon); w=3@IW  
 } 6A/Nlk.  
 else *#frbV?;  
 { >NW /0'/  
  CDialog::OnPaint(); +?(2-RBd  
 } 'e\m6~u\hm  
} ?ae:9ZcH  
z(3mhMJY  
HCURSOR CCaptureDlg::OnQueryDragIcon() |z|5j!Nfh  
{ I [0od+K  
 return (HCURSOR) m_hIcon; o'%F*>#v  
} Uz\B^"i|  
M{:gc7%  
void CCaptureDlg::OnCancel() qw0tw2|  
{ +:~&"U^ z&  
 if(bTray) Yq#I# 2RD  
  DeleteIcon(); ||}|=Sz  
  CDialog::OnCancel(); >$9}"  
} D*[J rq,  
F[$cE  
void CCaptureDlg::OnAbout() s2NBYDi$?  
{ dr}PjwW%  
 CAboutDlg dlg; U|Gy9"  
 dlg.DoModal(); >;hAw!|#  
} |idw?qCn  
ZK'46lh  
void CCaptureDlg::OnBrowse() h*C!b?:"  
{ qD ?`Yd  
 CString str; \>Rfa+  
 BROWSEINFO bi; Z:7eroZP  
 char name[MAX_PATH]; p> >H$t  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); qf\W,SM  
 bi.hwndOwner=GetSafeHwnd();  jF0"AA  
 bi.pszDisplayName=name; ]#^v754X^T  
 bi.lpszTitle="Select folder"; S<Gm*$[7  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 4Ex&AR8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Zs=A<[  
 if(idl==NULL) 2O[sRm)  
  return; t~j 6wsx;  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); l;@+=uVDHm  
 str.ReleaseBuffer();  *0^~@U  
 m_Path=str; ;J,(YNI 1  
 if(str.GetAt(str.GetLength()-1)!='\\') cI\[)5&  
  m_Path+="\\"; A| A#|D  
 UpdateData(FALSE); X:g5;NT  
} aMhVO(+FW  
wCNn/%C  
void CCaptureDlg::SaveBmp() y< *-&  
{ jBYv Oy*$Q  
 CDC dc; b;UDgq8v  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); oH%[8!#  
 CBitmap bm; N=<`|I  
 int Width=GetSystemMetrics(SM_CXSCREEN); Uc {m##!  
 int Height=GetSystemMetrics(SM_CYSCREEN); "nu]3zcd  
 bm.CreateCompatibleBitmap(&dc,Width,Height); .6C/,rQ?c  
 CDC tdc; 3;BIwb_  
 tdc.CreateCompatibleDC(&dc); =;uMrb4  
 CBitmap*pOld=tdc.SelectObject(&bm); 7\2I>W  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);  'Y)aGH(  
 tdc.SelectObject(pOld); &=kv69v  
 BITMAP btm; f|q/2}Bqb  
 bm.GetBitmap(&btm); >jAFt_  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; +:;ddV  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); bp:`m>4<  
 BITMAPINFOHEADER bih; Mww^  
 bih.biBitCount=btm.bmBitsPixel; \(j*K6#  
 bih.biClrImportant=0; .yZLC%}  
 bih.biClrUsed=0; dE_Xd :>  
 bih.biCompression=0; l EFd^@t  
 bih.biHeight=btm.bmHeight; H575W"53  
 bih.biPlanes=1; _P qq*  
 bih.biSize=sizeof(BITMAPINFOHEADER); Uw.')ZY=  
 bih.biSizeImage=size; Z5 IWoY  
 bih.biWidth=btm.bmWidth; bKCE;Wu:G  
 bih.biXPelsPerMeter=0; ;F"!$Z/  
 bih.biYPelsPerMeter=0; MIIl+   
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); y ;[~(Yg[  
 static int filecount=0; (V6bX]<  
 CString name; I!Z`'1"  
 name.Format("pict%04d.bmp",filecount++); 3t TOs  
 name=m_Path+name; z:#]P0  
 BITMAPFILEHEADER bfh; C LaQE{  
 bfh.bfReserved1=bfh.bfReserved2=0; 05FGfnq.8  
 bfh.bfType=((WORD)('M'<< 8)|'B'); S"h;u=5it  
 bfh.bfSize=54+size; r$={_M$  
 bfh.bfOffBits=54; JFm@jc  
 CFile bf; c}qpmWF  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ZDFq=)0C  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Qi`3$<W>  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [Xu8~c X  
  bf.WriteHuge(lpData,size); <@ .e.H  
  bf.Close(); gA(npsUHI  
  nCount++; [_)`G*X(N  
 } UGO;5!  
 GlobalFreePtr(lpData); XMI*obS'z  
 if(nCount==1) ]LC4rS  
  m_Number.Format("%d picture captured.",nCount); j;-Wf6h{  
 else dw<i)P^   
  m_Number.Format("%d pictures captured.",nCount); N^rpPq  
  UpdateData(FALSE); kzRvLs4xM  
} 4@-tT;$  
rc8HZ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) jy!]MAP#Gk  
{ 7y|U!r"Y  
 if(pMsg -> message == WM_KEYDOWN) D j9aTO  
 { 7@;*e=v  
  if(pMsg -> wParam == VK_ESCAPE) 8/aJ4w[A  
   return TRUE; m| ,Tk:xH  
  if(pMsg -> wParam == VK_RETURN) zas&gsl-;  
   return TRUE; jum"T\  
 } SF:98#pg  
 return CDialog::PreTranslateMessage(pMsg); ]XEyG7D  
} ; CCg]hX  
FLMiW]?x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) F6q=W#~  
{ VxN#\D i&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ta)gOc)r R  
  SaveBmp(); 5?>4I"ne  
  return FALSE; KY  
} k _V+;&:%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ D", L.  
 CMenu pop; ]2@(^x'=  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,H7_eVLWR  
 CMenu*pMenu=pop.GetSubMenu(0); ^@V*:n^  
 pMenu->SetDefaultItem(ID_EXITICON); 1$T`j2s  
 CPoint pt; !.j{vvQ/  
 GetCursorPos(&pt); s1 >8uW  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); W/2y; @  
 if(id==ID_EXITICON) ]vQa~}  
  DeleteIcon(); _R\FB|_  
 else if(id==ID_EXIT) ?C2(q6X+s  
  OnCancel(); ,"`20.Lv  
 return FALSE; ED>7  
} 5<(* +mP`  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `Vw G]2 I  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :g|.x  
 AddIcon(); F-3=eKZ  
 return res; *1dZs~_  
} W8g13oAu"  
}'P|A  
void CCaptureDlg::AddIcon() uBww  
{ |Gz<I  
 NOTIFYICONDATA data; ([q>.[WbH]  
 data.cbSize=sizeof(NOTIFYICONDATA); V4R s  
 CString tip; { }/  
 tip.LoadString(IDS_ICONTIP); #-B<u-  
 data.hIcon=GetIcon(0); %6cr4}Zm}  
 data.hWnd=GetSafeHwnd(); `C>h]H(  
 strcpy(data.szTip,tip); pqO3(2F9  
 data.uCallbackMessage=IDM_SHELL; bDvGFSAH  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; j>JBZ#g  
 data.uID=98; .@&FJYkLYi  
 Shell_NotifyIcon(NIM_ADD,&data); Wmd@%K  
 ShowWindow(SW_HIDE); nr]=O`Mvh  
 bTray=TRUE; %_E5B6xi{  
} 66?`7j X  
ELwXp|L  
void CCaptureDlg::DeleteIcon() _K#7#qp2  
{ K7&]| ^M9  
 NOTIFYICONDATA data; HHx:s2G  
 data.cbSize=sizeof(NOTIFYICONDATA); 6h/!,j0:t_  
 data.hWnd=GetSafeHwnd(); ^ZsIQ4@`  
 data.uID=98; la{?&75]  
 Shell_NotifyIcon(NIM_DELETE,&data); = cxO@Fu  
 ShowWindow(SW_SHOW); U[pHT _U  
 SetForegroundWindow(); 2*D2jw  
 ShowWindow(SW_SHOWNORMAL); F4\:9ws  
 bTray=FALSE; ']2Vf] dB  
} z!6_u@^-  
-"xAeI1+  
void CCaptureDlg::OnChange() hXI[FICQU{  
{ %@:>hQ2;  
 RegisterHotkey(); X40gJV<  
} `S((F|Ty=;  
l)$mpMgAD  
BOOL CCaptureDlg::RegisterHotkey() O;VqrO  
{ -btNwE6[.  
 UpdateData(); TE&E f$h  
 UCHAR mask=0; rrU(>jA!  
 UCHAR key=0; (Yj6 |`  
 if(m_bControl) Q)aoc.f!v  
  mask|=4; :j+E]|d(~6  
 if(m_bAlt) vltE2mb  
  mask|=2; zk$h71<{.  
 if(m_bShift) +iN!$zF5]  
  mask|=1; x}a?B  
  key=Key_Table[m_Key.GetCurSel()]; GThGV"  
 if(bRegistered){ ,zZH>P  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); waC i9  
  bRegistered=FALSE; Q% aF~  
 } R~oY R,L;  
 cMask=mask; 9ls1y=M8J  
 cKey=key; 1R-0b{w[  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 6'*6tS  
 return bRegistered; wOL%otEf  
} 53uptQ{   
T|\sN*}\8J  
  四、小结 z]g#2xD2  
Jy:@&c  
  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