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
  • 6470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: an5kR_=  
  a0j.\g  
  一、实现方法 0tL/:zID  
_q 9lr8hx  
  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: RxeRO2  
7JwWM2N?V  
#pragma data_seg("shareddata")  DlkKQ  
HHOOK hHook =NULL; //钩子句柄 u~T$F/]k>  
UINT nHookCount =0; //挂接的程序数目 PY:#F|uHS`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 GB0b|9(6D"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 21EUP6}8j  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey x$b[m 20  
static int KeyCount =0; (C_o^_I:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 h sw My  
#pragma data_seg() >-o:> 5  
}AfPBfgC1z  
  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。 M&T/vByTn_  
_89G2)U=C  
  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: Leick 6  
2o5< nGn  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR a7d-  
cKey,UCHAR cMask) bQQ/7KM  
{ kb\v}gfiD/  
 BOOL bAdded=FALSE; jmzvp6N$8  
 for(int index=0;index<MAX_KEY;index++){ |]3);^0  
  if(hCallWnd[index]==0){ %((3'le  
   hCallWnd[index]=hWnd; %~VIxY|d  
   HotKey[index]=cKey; ;xH'%W9z  
   HotKeyMask[index]=cMask; JNg5?V;.U  
   bAdded=TRUE; % +"AF+c3r  
   KeyCount++; l"!;Vkg.5  
   break; 0J-ux"kfI  
  } 9)hC,)5  
 } @Iatlz*W  
 return bAdded; 07Cuoqt2  
} %4^/.) Q  
//删除热键 Q&a<9e&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iDxgAV f*  
{ _ILOA]ga#  
 BOOL bRemoved=FALSE; s'=]a-l~  
 for(int index=0;index<MAX_KEY;index++){ 3AL=*qq  
  if(hCallWnd[index]==hWnd){ xEWa<P#.u  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Wfw9cxGkf  
    hCallWnd[index]=NULL;  #7"5Y_0-  
    HotKey[index]=0; g<c^\WG  
    HotKeyMask[index]=0; jC8BLyGE_  
    bRemoved=TRUE; G ~\$Oq8  
    KeyCount--; \$UU/\  
    break; b4PK  
   } qz2d'OhmtH  
  } !]T|=yw  
 } rt;>pQ9,  
 return bRemoved; t\0JNi$2  
} #Og_q$})f  
9K(b Z {  
4"=pcHNV  
  DLL中的钩子函数如下: `Yve  
g8y Zc}4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) UG$i5PV%i  
{ a]ey..m  
 BOOL bProcessed=FALSE; <O&s 'A[  
 if(HC_ACTION==nCode) `-2`UGB-  
 { x7>sy,c  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $OuA<-  
   switch(wParam) %hQ`b$07t  
   {  XA%?35v~  
    case VK_MENU: h|Qh/jCX  
     MaskBits&=~ALTBIT; ?-i&6i6Y  
     break; 2US8<sq+  
    case VK_CONTROL: c6.|; 4  
     MaskBits&=~CTRLBIT; hNfL /^w  
     break; ;kA2"c]m  
    case VK_SHIFT: 8a1{x(\z.  
     MaskBits&=~SHIFTBIT; .kV/ 0!q?  
     break; $>Do&TU   
    default: //judge the key and send message C ^'}{K  
     break; sj2+|>  
   } \!Pm^FD .  
   for(int index=0;index<MAX_KEY;index++){ )JON&~C  
    if(hCallWnd[index]==NULL) IYPI5qCR  
     continue; [;+YO)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7EUaf;d^  
    { 14O/R3+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &40d J~SQ  
     bProcessed=TRUE; EO^0sF<  
    } 4}`MV.  
   } 1l{n`gR  
  } q_)DY f7V}  
  else if((lParam&0xc000ffff)==1){ //有键按下 8cl!8gfv  
   switch(wParam) YjT #^AH  
   { ZO}*^  
    case VK_MENU: Rp1OC  
     MaskBits|=ALTBIT; J2-xnUa]7  
     break; $U1'n@/J  
    case VK_CONTROL: Oi RqqD  
     MaskBits|=CTRLBIT; @g{ " E6  
     break; 1Y_fX  
    case VK_SHIFT: 0nX5 $Kn  
     MaskBits|=SHIFTBIT; :Li)]qN.I  
     break; e3.TGv7=  
    default: //judge the key and send message G(L*8U< UG  
     break; mDhU wZH  
   } 1Pbp=R/7ar  
   for(int index=0;index<MAX_KEY;index++){ U]d+iz??b  
    if(hCallWnd[index]==NULL) Sq,x@  
     continue; 6 BMn7m?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B dSTB"  
    { tSjK=1"}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Wr;)3K  
     bProcessed=TRUE; ZD*>i=S  
    } Zn/1uWO  
   } @#p4QEQA  
  } 7RO=X%0A  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 8w$cj'  
   for(int index=0;index<MAX_KEY;index++){ jhHb[je~{4  
    if(hCallWnd[index]==NULL) *GA#.$n  
     continue; `7NgQ*g.d/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;YB8X&H$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r&#q=R},p  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ^T" A9uaG  
   } zx^)Qb/EL6  
  } IQ\`n|  
 } 7Sokn?~i  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~V<je b  
} ;^;5"n h  
Zhw _L  
  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: d(&vIjy  
T]+*} C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6;VlX,,j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); f!87JE=<  
4h|D[Cb]  
  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: R,(^fM  
!R-UL#w9W'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) BR|dW4\  
{ ~{HA!C#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) r J&1[=s  
 { ='s2S5#1  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 {KR/ TQ?A  
  SaveBmp(); Z-WWp#b  
  return FALSE; q,2 @X~T  
 } P9c1NX\-  
 …… //其它处理及默认处理 ?[kO= hs  
} bf3)^ 49}  
4>(?R[:p)  
#df Aqg'  
  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。 371E S4  
&c A?|(7-  
  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。 u*"tZ+|m  
yfV{2[8ux  
  二、编程步骤 gxJ(u{2  
Q_ $AGF  
  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"; i;)88  
 3o/f#y  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; uH`ds+Hp  
aPWFb.JO4  
  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; [QeKT8  
"5{\0CfS  
  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; 4((Z8@iX/  
9~N7hLT  
  5、 添加代码,编译运行程序。 BWd?a6nU}  
-cG?lEh <  
三、程序代码 B3K%V|;z )  
]SK(cfA`  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL DK:d'zb  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) p/@z4TCNX  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ {`-EX  
#if _MSC_VER > 1000 IUzRE?Kzf  
#pragma once bBjVot  
#endif // _MSC_VER > 1000 E#T'=f[r~  
#ifndef __AFXWIN_H__ bMgp  
#error include 'stdafx.h' before including this file for PCH :5;[Rg5 2  
#endif AX6e}-S1n  
#include "resource.h" // main symbols I(<1-3~  
class CHookApp : public CWinApp =MMWcK&  
{ a29mVmi>  
 public: 9gjx!t>`H  
  CHookApp(); K":- zS  
  // Overrides XfB;^y=u8  
  // ClassWizard generated virtual function overrides 2 !{P<   
  //{{AFX_VIRTUAL(CHookApp) y#r=^r]l)  
 public: qD 2<-E&M/  
  virtual BOOL InitInstance(); K?P.1H`  
  virtual int ExitInstance(); %R(j|a9z  
  //}}AFX_VIRTUAL | YvO$4=s  
  //{{AFX_MSG(CHookApp) Yh"R#  
  // NOTE - the ClassWizard will add and remove member functions here. S7-?&[oeJ  
  // DO NOT EDIT what you see in these blocks of generated code ! Dz.U&+*  
  //}}AFX_MSG ^ 3Vjmv  
  DECLARE_MESSAGE_MAP() 5FzG_ w  
}; V$@@!q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); w W-GBY3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T Li0*)}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ci ,o'`Q  
BOOL InitHotkey(); W.>yIA%  
BOOL UnInit(); N+h|Ffnp  
#endif x%LWcT/  
.nT"f>S&'  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. a]75z)X R  
#include "stdafx.h" wtMS<$  
#include "hook.h" !! #\P7P  
#include <windowsx.h> J\#6U|a""u  
#ifdef _DEBUG l@## Ex9  
#define new DEBUG_NEW nLYyS#  
#undef THIS_FILE =n%?oLg^  
static char THIS_FILE[] = __FILE__; ^]OD+v  
#endif ]kc]YO7i%R  
#define MAX_KEY 100 P%.9g  
#define CTRLBIT 0x04 z.#gpTXD  
#define ALTBIT 0x02 D4_D{\xhO  
#define SHIFTBIT 0x01 +BmA4/P$  
#pragma data_seg("shareddata") #uKHw2N  
HHOOK hHook =NULL; 4ajBMgD]KG  
UINT nHookCount =0; -j<m0XUQ  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey m_oBV|v{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 852$Ui|I  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey .] 5&\  
static int KeyCount =0; N\mV+f3A@,  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  Q"%L  
#pragma data_seg() %xL3=4\  
HINSTANCE hins; POx~m  
void VerifyWindow(); :Ruj;j  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 61CNEzQ  
//{{AFX_MSG_MAP(CHookApp) HnZr RHT 0  
// NOTE - the ClassWizard will add and remove mapping macros here. {{:MJ\_"h_  
// DO NOT EDIT what you see in these blocks of generated code! ("wPkm^  
//}}AFX_MSG_MAP kf^Wzp  
END_MESSAGE_MAP() E/Y.f  
wHdq:,0-!  
CHookApp::CHookApp() 0W#.$X5  
{ e(j"u;=  
 // TODO: add construction code here, iQS?LksQX  
 // Place all significant initialization in InitInstance h (jg7R  
} %/s:G)  
Onby=Y o6  
CHookApp theApp; 3K P6M=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $  5  
{ Z5_MSPm  
 BOOL bProcessed=FALSE; >L)Xyq  
 if(HC_ACTION==nCode) ^PO0(rh  
 { @^/JNtbH!  
  if((lParam&0xc0000000)==0xc0000000){// Key up zI(b#eUF  
   switch(wParam) tHD mX  
   { `ffWV;P  
    case VK_MENU: Eo)n( Z9  
     MaskBits&=~ALTBIT; m &c8@-T  
     break; Fpl<2eBg4  
    case VK_CONTROL: ,c}Q;eYc3  
     MaskBits&=~CTRLBIT; H#G'q_uHH  
     break; PJ9JRG7j  
    case VK_SHIFT: H?M8j] R-)  
     MaskBits&=~SHIFTBIT; r's4-\  
     break; naW}[y*y;  
    default: //judge the key and send message G$Z8k,g+<7  
     break; ( 8k3z`  
   } >lN{FJ  
   for(int index=0;index<MAX_KEY;index++){ r!#NFek}  
    if(hCallWnd[index]==NULL) Qq^>7OU>Co  
     continue; m`E8gVC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]@>bz  
    { ]`]m41+w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); b'uH4[zX%  
     bProcessed=TRUE; `[/BG)4  
    } "?n~ /9`  
   } hZ5h(CQ?"#  
  } Bu*ge~  
  else if((lParam&0xc000ffff)==1){ //Key down +*~?JT  
   switch(wParam) i$"B  
   { FtT+Q$q=  
    case VK_MENU: (Kv[~W7lb  
     MaskBits|=ALTBIT; cqi: Rj  
     break; g@KS\.m]  
    case VK_CONTROL: VI[ikNpX  
     MaskBits|=CTRLBIT; 1/JgirVA  
     break; -.i1l/FzP  
    case VK_SHIFT: ^~8l|d_  
     MaskBits|=SHIFTBIT; #Z(8 vA^@  
     break; {BDp`uZ  
    default: //judge the key and send message #2{ };)  
     break; ``K.4sG  
   } -E?h^J&U  
   for(int index=0;index<MAX_KEY;index++) !~"q$T>@  
   { x}].lTjD  
    if(hCallWnd[index]==NULL) }=az6cLE2  
     continue; 0 B>{31)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r68'DJ&m3  
    { teQ%t~PJ-&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 66Huqo  
     bProcessed=TRUE; 3Q Zw  
    } $yI!YX&  
   } ?:~Y%4;  
  } }vPDCUZ  
  if(!bProcessed){ Ri"3o  
   for(int index=0;index<MAX_KEY;index++){ z9u"?vdA  
    if(hCallWnd[index]==NULL) XM>ByfD{  
     continue; \<]nv}1O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) hA/K>Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); sGc4^Z%l?  
   } n\ZDI+X  
  } 9=K=gfZ  
 } #p6#,PZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5<Xq7|Jt  
} &iId<.SiJ  
CXb)k.L   
BOOL InitHotkey() lpj$\WI=  
{ %koHTWT+  
 if(hHook!=NULL){ ` ` 6?;Y  
  nHookCount++; C$b$)uI;  
  return TRUE; B}C"Xc  
 } VD<W  
 else 0".pw; .}  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %, XyhS5[o  
  if(hHook!=NULL) yv[ s)c}  
   nHookCount++; ^kzw/. I{  
  return (hHook!=NULL); Cn[`]  
} U8\[8~Xftn  
BOOL UnInit() ,ZC^,Vq  
{ l{E+j%  
 if(nHookCount>1){ 5kofO  
  nHookCount--; oost}%WxN  
  return TRUE; Sz.jv#Y  
 } =pF 6  
 BOOL unhooked = UnhookWindowsHookEx(hHook); #,0%g 1  
 if(unhooked==TRUE){ a)`b;]+9  
  nHookCount=0; 0' @^PzX  
  hHook=NULL; '/Hx0]V  
 } ix=HLF-0zC  
 return unhooked; @c9VCG D  
} >s1'I:8  
bN8GRK )  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kViX FPW  
{ CZS{^6Ye  
 BOOL bAdded=FALSE; )K4 |-<i  
 for(int index=0;index<MAX_KEY;index++){ a.y_o50#T  
  if(hCallWnd[index]==0){ S=n,unn#t  
   hCallWnd[index]=hWnd; k z@@/DD/9  
   HotKey[index]=cKey; @K7#}7,t  
   HotKeyMask[index]=cMask; NgaX&m`  
   bAdded=TRUE; 0-oR { {  
   KeyCount++; AL>*Vj2h/n  
   break; !=V>DgmW  
  } [ft#zxCJ  
 } ,q]W i#  
 return bAdded; g PU|Gv5  
} $ o?Wum  
Z}5 ;K"T/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .:B] a7b  
{ ?J<Y]  
 BOOL bRemoved=FALSE; \`Db|D?oy  
 for(int index=0;index<MAX_KEY;index++){ Ysz{~E'  
  if(hCallWnd[index]==hWnd){ )3V5P%Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ HcXyU/>D  
    hCallWnd[index]=NULL; lUJ/ nG0l  
    HotKey[index]=0; ]2T=%(*  
    HotKeyMask[index]=0; @V Bv}Jo  
    bRemoved=TRUE; Tar tV3;`  
    KeyCount--; (`>RwooE  
    break; %K@D{ )r_^  
   } G9TK)Nz  
  } 2M3.xUS  
 } ++W_4 B!  
 return bRemoved; Dt0S"`^=k  
} t|jX%s=  
bJj <xjBM  
void VerifyWindow() .3l'&".'  
{ )2C_6eR  
 for(int i=0;i<MAX_KEY;i++){ {0+gPTp  
  if(hCallWnd!=NULL){ ,Drd s"H  
   if(!IsWindow(hCallWnd)){ )cNG)F  
    hCallWnd=NULL; N|EH`eu^i  
    HotKey=0; g 7res  
    HotKeyMask=0; -ve{O-;  
    KeyCount--; gk>-h,>"  
   } 1a;Le8  
  } 7^4F,JuJO  
 } 4\H:^U&  
} 2-Y%W(bEzs  
f^@`[MJj1C  
BOOL CHookApp::InitInstance() oj /:  
{ S0eD 2  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6UXa 5t  
 hins=AfxGetInstanceHandle(); (Hb i+IHV  
 InitHotkey(); 8zS't2 u  
 return CWinApp::InitInstance(); Ad xCP\S&  
} !([Q1r{u  
br*L|s\P\9  
int CHookApp::ExitInstance() ,R5NKWo  
{ <7fF9X  
 VerifyWindow(); ]1>U@oK  
 UnInit(); :A%uXgK<k  
 return CWinApp::ExitInstance(); TBHIcX  
} eN fo8xUG  
b*S :wfw  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,'?%z>RZm  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8aQ\Yx  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ B<i )je!  
#if _MSC_VER > 1000 8  !]$ljg  
#pragma once \Q7Nz2X  
#endif // _MSC_VER > 1000 R ,-y  
9!zUv:;  
class CCaptureDlg : public CDialog W|_ @ju  
{ H)(@A W+-  
 // Construction P/5bNK!  
 public: Xm`jD'G  
  BOOL bTray; -K hXb  
  BOOL bRegistered; h~)oiT2v  
  BOOL RegisterHotkey(); B- =*"H?q  
  UCHAR cKey; xwhH_[  
  UCHAR cMask; 2qLRcA=R  
  void DeleteIcon(); p1 > D  
  void AddIcon(); rC V&& 09  
  UINT nCount; 9oKRn c  
  void SaveBmp(); JG @bl  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor rT9<_<  
  // Dialog Data mE^mQ [Dk  
  //{{AFX_DATA(CCaptureDlg) 6"U&i9  
  enum { IDD = IDD_CAPTURE_DIALOG }; [hSE^ m  
  CComboBox m_Key; Q]9H9?}N?  
  BOOL m_bControl; ye=*m  
  BOOL m_bAlt; 0 {#c  
  BOOL m_bShift; "vQ$RW -  
  CString m_Path; 0|E!e  
  CString m_Number; N>!RKf:ir  
  //}}AFX_DATA "PK\;#[W|  
  // ClassWizard generated virtual function overrides e@"1W  
  //{{AFX_VIRTUAL(CCaptureDlg) 6Ko[[?Lf[  
 public: S G|``}OA  
  virtual BOOL PreTranslateMessage(MSG* pMsg); RL7OFfMe  
 protected: Cg<:C?>!p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Mk9'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); P -0  
  //}}AFX_VIRTUAL k_?xi OSh  
  // Implementation xtMN<4#E  
 protected: xzTTK+D@  
  HICON m_hIcon; N+%E=D>  
  // Generated message map functions :=WiT_M  
  //{{AFX_MSG(CCaptureDlg) RO"c+|Py  
  virtual BOOL OnInitDialog(); RO?5WJpPj  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ZnSDq_Uk  
  afx_msg void OnPaint(); VZB T'N  
  afx_msg HCURSOR OnQueryDragIcon(); H'|b$rP0@  
  virtual void OnCancel(); %SuEfCM  
  afx_msg void OnAbout(); :fz&)e9  
  afx_msg void OnBrowse(); awLN>KI]</  
  afx_msg void OnChange(); aTF~rAne<  
 //}}AFX_MSG Sd/?xyF1(  
 DECLARE_MESSAGE_MAP() d~@&*1}  
}; -jy- KC  
#endif .^j6  
X-&t!0O4}`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file # le<R  
#include "stdafx.h" b-R!oP+vP  
#include "Capture.h" g((glr)6M  
#include "CaptureDlg.h" M&o@~z0  
#include <windowsx.h> aZEi|\VU  
#pragma comment(lib,"hook.lib") 4UD<g+|  
#ifdef _DEBUG :#W40rUb  
#define new DEBUG_NEW xp-.,^q\w  
#undef THIS_FILE p.^glz>B  
static char THIS_FILE[] = __FILE__; ]7 " W(  
#endif 5W_u|z+/g  
#define IDM_SHELL WM_USER+1 S\=j; Uem  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K0$8t%Z.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ; mnV)8:F  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^Uss?)jN4  
class CAboutDlg : public CDialog 17g\XC@ Cl  
{ S^0Po%d  
 public: aC:Sy^Tf  
  CAboutDlg(); 5q?2?j/h  
  // Dialog Data )HbsUm#  
  //{{AFX_DATA(CAboutDlg) $GhdH)  
  enum { IDD = IDD_ABOUTBOX }; F0h`>{1%  
  //}}AFX_DATA epM;u  
  // ClassWizard generated virtual function overrides /.{4 KW5  
  //{{AFX_VIRTUAL(CAboutDlg) . U|irDO  
 protected: nI4Kuz`dF  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R!IODXP=  
  //}}AFX_VIRTUAL IGz92&y  
  // Implementation ;v%Fw!b032  
 protected: HnU; N S3J  
  //{{AFX_MSG(CAboutDlg) (3 xCW  
  //}}AFX_MSG ;mH O#  
  DECLARE_MESSAGE_MAP() <>JN&#3?  
}; Ojqbj0E9  
*y +T(73  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) s&:LY"[`  
{ L&V;Xvbu%  
 //{{AFX_DATA_INIT(CAboutDlg) 70bI}/u  
 //}}AFX_DATA_INIT d l_ h0  
} {"|P  
c"`o V! m  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) x<^+nTzN  
{ Y+5nn  
 CDialog::DoDataExchange(pDX); 8|k r|l  
 //{{AFX_DATA_MAP(CAboutDlg) kDJ $kv  
 //}}AFX_DATA_MAP wGdnv}#  
} {(;dHF%{  
-4ityS @  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^uB9EP*P  
 //{{AFX_MSG_MAP(CAboutDlg) ?m.WqNBH7  
 // No message handlers S9/oBxGN  
 //}}AFX_MSG_MAP 8xs}neDg*  
END_MESSAGE_MAP() 0kxo  
"F A&Qm0  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) R gY-fc0  
: CDialog(CCaptureDlg::IDD, pParent) r}kQ<SRx  
{ &)`xlIw}  
 //{{AFX_DATA_INIT(CCaptureDlg) i#Tm] ++  
  m_bControl = FALSE; ":s1}A  
  m_bAlt = FALSE; al>^}:  
  m_bShift = FALSE; RsV<4$  
  m_Path = _T("c:\\"); 7<{g+Q~7*  
  m_Number = _T("0 picture captured."); p!qV!:  
  nCount=0; Ip#BR!$n  
  bRegistered=FALSE; $|+q9 o\  
  bTray=FALSE; Ia_I~ U$  
 //}}AFX_DATA_INIT *Ju$A  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 K.3)m]dCl  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); %:i; eUKR  
}  2fZVBj  
M- inlZNR  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) XaT9`L<  
{ >YP6/w,e  
 CDialog::DoDataExchange(pDX); I(LBc  
 //{{AFX_DATA_MAP(CCaptureDlg) h| q!Qsnj'  
  DDX_Control(pDX, IDC_KEY, m_Key); w`_cmI  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); K_/-mwA v  
  DDX_Check(pDX, IDC_ALT, m_bAlt); P$LHsg]  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); o,o,(sII  
  DDX_Text(pDX, IDC_PATH, m_Path); 9G njJ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); hP1}Do  
 //}}AFX_DATA_MAP 1aEM&=h_W  
} *sNZ.Y:.  
yB][ 3?lv  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [:M:6JJ  
//{{AFX_MSG_MAP(CCaptureDlg) U caLi&  
 ON_WM_SYSCOMMAND() qKoD*cl)Za  
 ON_WM_PAINT() Uc oVp}vl  
 ON_WM_QUERYDRAGICON() kLc}a5;  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %eJolztKZ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) "^sh:{  
 ON_BN_CLICKED(ID_CHANGE, OnChange)  zxN,ys  
//}}AFX_MSG_MAP cuv?[ M  
END_MESSAGE_MAP() kU uDA><1  
+/!kL0[v  
BOOL CCaptureDlg::OnInitDialog() +; /]'  
{ wHneVqI/U  
 CDialog::OnInitDialog(); \HR<^xY  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "},0Cs  
 ASSERT(IDM_ABOUTBOX < 0xF000); ODS8bD0!i  
 CMenu* pSysMenu = GetSystemMenu(FALSE); X|o;*J](  
 if (pSysMenu != NULL) b6KO_s:'g  
 { SvR:tyF  
  CString strAboutMenu; 3FWl_d~uD  
  strAboutMenu.LoadString(IDS_ABOUTBOX); sEBZ-qql  
  if (!strAboutMenu.IsEmpty()) Hn~=O8/2  
  { o1jDQ+  
   pSysMenu->AppendMenu(MF_SEPARATOR); J\7ukm"9  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); tG!ApL  
  } Qs v3`c  
 } hC1CISm.U  
 SetIcon(m_hIcon, TRUE); // Set big icon y3!r;>2k=  
 SetIcon(m_hIcon, FALSE); // Set small icon Fk&W*<}/;  
 m_Key.SetCurSel(0); 5Q_ T=TL  
 RegisterHotkey(); QGv$~A[h  
 CMenu* pMenu=GetSystemMenu(FALSE); j?!BHNs  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~Sq!P  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);  :{#%_^}k  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \}CQo0v  
 return TRUE; // return TRUE unless you set the focus to a control |%wgux`z  
} lqD.epm  
ZUDdLJ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Vz=ByyC  
{ 82w;}(!  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lr >:S  
 { Xz/5 Wis4  
  CAboutDlg dlgAbout; z^@.b  
  dlgAbout.DoModal(); IZr~h9  
 } [VvTR#^  
 else 7d9kr?3(U  
 { &G#LQl  
  CDialog::OnSysCommand(nID, lParam); 3Z,J &d`[  
 } +TA 'P$j  
} \BIa:}9O  
+w'"N  
void CCaptureDlg::OnPaint() !_zp'V]?  
{ U)v['5%  
 if (IsIconic()) WCa>~dF>  
 { /g|H?F0  
  CPaintDC dc(this); // device context for painting }>)e~\Tdzb  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +ZuT\P&kR5  
  // Center icon in client rectangle I+qg'mo  
  int cxIcon = GetSystemMetrics(SM_CXICON); :0G_n\  
  int cyIcon = GetSystemMetrics(SM_CYICON); u\L=nCtLby  
  CRect rect; 4!%@{H`3  
  GetClientRect(&rect); yr4j  
  int x = (rect.Width() - cxIcon + 1) / 2; g43j-[j)  
  int y = (rect.Height() - cyIcon + 1) / 2; ,tt .oF|  
  // Draw the icon 5m.{ayE  
  dc.DrawIcon(x, y, m_hIcon); f9+J}  
 } )<J|kC\r6c  
 else M%*D}s-QE  
 { HR.^ y$IE  
  CDialog::OnPaint(); X@ zw;Se  
 } Z*AT &7  
} GM1z@i\5  
}}R?pU_  
HCURSOR CCaptureDlg::OnQueryDragIcon() )@vhqVv?  
{ &sFEe<  
 return (HCURSOR) m_hIcon; li!3bv  
} ,F&TSzH[@v  
O)0}yF$0  
void CCaptureDlg::OnCancel() @D?KS;#  
{ c"nowbf  
 if(bTray) hxCSE$f4  
  DeleteIcon(); |2i=oX(r|  
  CDialog::OnCancel(); wiwAdYEQ\  
} dC&OjBQ  
K-_XdJ\  
void CCaptureDlg::OnAbout() D=B$ Pv9%  
{ gD13(G98  
 CAboutDlg dlg; i~};5j(  
 dlg.DoModal(); h/)kd3$*'  
} *3uBS2Ld  
SG5GJCkc  
void CCaptureDlg::OnBrowse() [`F}<L."  
{ S]}hh,A  
 CString str; w^ AY= Fc  
 BROWSEINFO bi; $nkvp`A  
 char name[MAX_PATH]; I_/E0qSJI  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Yk;-]qi7  
 bi.hwndOwner=GetSafeHwnd(); jOkc'  
 bi.pszDisplayName=name; ,A$#gLyk<  
 bi.lpszTitle="Select folder"; {7'Evfn)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; t2L }  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); m;_gNh8Ee  
 if(idl==NULL) \ oY/hT_  
  return; ~wtK(U  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); cEdf&*_-'I  
 str.ReleaseBuffer(); uwL^Tq}Yh  
 m_Path=str; cuw 7P  
 if(str.GetAt(str.GetLength()-1)!='\\') s6U$]9 `  
  m_Path+="\\"; lQ8h-Tz  
 UpdateData(FALSE); h_( #U)z_3  
} /?ZO-]q  
B4D#T lB  
void CCaptureDlg::SaveBmp() Oc6_x46S4  
{ YaBZ#$r  
 CDC dc; EJCf[#Sf  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL);  Kl'u  
 CBitmap bm; 65HP9`5Tm  
 int Width=GetSystemMetrics(SM_CXSCREEN); tj' xjX  
 int Height=GetSystemMetrics(SM_CYSCREEN); VRb+-T7"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); J1s~w`,  
 CDC tdc; EbfE/_I  
 tdc.CreateCompatibleDC(&dc); 1*aO2dOq  
 CBitmap*pOld=tdc.SelectObject(&bm); B~CdY}UTsj  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); & t.G4  
 tdc.SelectObject(pOld); { R`"Nk  
 BITMAP btm; 'bd|Oww1u  
 bm.GetBitmap(&btm); s|`ZV^R  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; yd}1Mx  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +HXR ))X  
 BITMAPINFOHEADER bih; 8opd0'SNaB  
 bih.biBitCount=btm.bmBitsPixel; rW P -Rm  
 bih.biClrImportant=0; 18HmS>Qo  
 bih.biClrUsed=0; A2 r\=for  
 bih.biCompression=0; s3/iG37K  
 bih.biHeight=btm.bmHeight; nF)b4`Nd  
 bih.biPlanes=1; f@j)t%mh  
 bih.biSize=sizeof(BITMAPINFOHEADER); _.{I1*6Y2  
 bih.biSizeImage=size; >1$ vG  
 bih.biWidth=btm.bmWidth; :Rroz]*  
 bih.biXPelsPerMeter=0; u_Wftb?9  
 bih.biYPelsPerMeter=0; {vhP'!a6W  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); anzt;V.;Y  
 static int filecount=0; #Q]^9/;|4n  
 CString name; NT0im%  
 name.Format("pict%04d.bmp",filecount++); nOCCOTf  
 name=m_Path+name; XkEJ_;:  
 BITMAPFILEHEADER bfh; joRrsxFU  
 bfh.bfReserved1=bfh.bfReserved2=0; NQmdEsK  
 bfh.bfType=((WORD)('M'<< 8)|'B'); sGp]jqX2,m  
 bfh.bfSize=54+size; m-HL7&iG$  
 bfh.bfOffBits=54; m ]h<y  
 CFile bf; (a9>gLI0  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (-[73v-w  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 4Zn"K}q  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Mb^E  
  bf.WriteHuge(lpData,size); ,J4rKGG  
  bf.Close(); W\pO`FL  
  nCount++; m<e_Z~^G  
 } ~PtIq.BY  
 GlobalFreePtr(lpData); @2;/-,4O  
 if(nCount==1) fP KFU  
  m_Number.Format("%d picture captured.",nCount); bzWWW^kNL  
 else 7C>5XyyJ  
  m_Number.Format("%d pictures captured.",nCount); L)z`  
  UpdateData(FALSE); 1EemVZdY  
} +B&,$ceyaJ  
'* eeup  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) b6?&h:{k  
{ (MGYX_rD  
 if(pMsg -> message == WM_KEYDOWN) EY^+ N>  
 { 1=Z, #r  
  if(pMsg -> wParam == VK_ESCAPE) rizWaw5E!8  
   return TRUE; 0,]m.)ws  
  if(pMsg -> wParam == VK_RETURN) f.G"[p  
   return TRUE; Js'j}w  
 } tJvs ?eZ)  
 return CDialog::PreTranslateMessage(pMsg); _'0C70  
} wj2z?0}o  
/Y`u4G()  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UbEK2&q/8  
{ J|aU}Z8m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KL\hV .6  
  SaveBmp(); b[rVr J  
  return FALSE; @#2KmM~I  
} xO{$6M3-~  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ k@[{_@>4^  
 CMenu pop; ~zYk,;m  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); sW&5Mu-  
 CMenu*pMenu=pop.GetSubMenu(0); xl ]1TB@  
 pMenu->SetDefaultItem(ID_EXITICON); 61W[  
 CPoint pt; ^N&@7s  
 GetCursorPos(&pt);  X]4j&QB  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]S 3l' "  
 if(id==ID_EXITICON) phi9/tO\u  
  DeleteIcon(); O^~Z-; FA  
 else if(id==ID_EXIT) +`f3_Xd  
  OnCancel(); <lgX=wx L  
 return FALSE; vLs*}+f  
} c->.eL%   
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (b8ZADI*  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :pdl2#5H^  
 AddIcon(); 85_Qb2<'r  
 return res; (3?W) i  
} n.7-$1  
&&ZX<wOM  
void CCaptureDlg::AddIcon() dCA! R"HD  
{ X#k:J  
 NOTIFYICONDATA data; lw43|_'G-t  
 data.cbSize=sizeof(NOTIFYICONDATA); %j/}e>$"Nk  
 CString tip; lSG]{  
 tip.LoadString(IDS_ICONTIP); a];1)zVA6  
 data.hIcon=GetIcon(0); Ku?1QDhrF*  
 data.hWnd=GetSafeHwnd(); rcz9\@M  
 strcpy(data.szTip,tip); vMzBp#MT  
 data.uCallbackMessage=IDM_SHELL; i:|e#$x  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _>E=.$  
 data.uID=98; @y2cC6+'t  
 Shell_NotifyIcon(NIM_ADD,&data); oc"7|YG  
 ShowWindow(SW_HIDE); \DcO .`L  
 bTray=TRUE; J,*+Ak ~  
} hr W2#v  
8 .t3`FGH  
void CCaptureDlg::DeleteIcon() 3}lIY7 O  
{ 2j&0U!DX  
 NOTIFYICONDATA data; snYyxi  
 data.cbSize=sizeof(NOTIFYICONDATA); #A&49a3^1  
 data.hWnd=GetSafeHwnd(); WOQ>]Z  
 data.uID=98; 5KTPlqm0qF  
 Shell_NotifyIcon(NIM_DELETE,&data); 8RT<?I^5  
 ShowWindow(SW_SHOW); Z~] G+(  
 SetForegroundWindow(); t=fr`|!  
 ShowWindow(SW_SHOWNORMAL); b(\Mi_J  
 bTray=FALSE; V8rS~'{\  
} >P ~j@Lv  
>en\:pJn)'  
void CCaptureDlg::OnChange() 4BZ7R,m#.  
{ j&[u$P*K  
 RegisterHotkey(); aVZ/e^kk-  
} mFmxEv  
%-[*G;c'w  
BOOL CCaptureDlg::RegisterHotkey() e>x+Xj1  
{ kqjj&{vPFJ  
 UpdateData(); @0V4$OoFl  
 UCHAR mask=0; s Fx0  
 UCHAR key=0; QjKh#sU&  
 if(m_bControl) [#(',~lN7  
  mask|=4; /!%?I#K{Wq  
 if(m_bAlt) WmkCV+thA  
  mask|=2; UrO& K]Z  
 if(m_bShift) 1a mEQ  
  mask|=1; R$`%<Y3)  
  key=Key_Table[m_Key.GetCurSel()]; U6.hH%\}@  
 if(bRegistered){ `A#0If  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); {Wndp%  
  bRegistered=FALSE; 4";NT;_q5  
 } h]vEXWpG]  
 cMask=mask; P`avn  
 cKey=key; Pif-uhOk%  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [hV}$0#E[O  
 return bRegistered; jX0^1d@  
} _sn<"B%>  
4 !m'9  
  四、小结 3 2"f'{  
6s>io%,:  
  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:
3+5=?,请输入中文答案:八 正确答案:八