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
  • 8031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: $QNfy.6Tn  
  f|m.v +7k  
  一、实现方法 jQ%}e"  
! r.X.C  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: cd) <t8^KE  
(xG#D;M0  
#pragma data_seg("shareddata") FOquQr1cF  
HHOOK hHook =NULL; //钩子句柄 |b'tf:l  
UINT nHookCount =0; //挂接的程序数目 yXg783B|v  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 yJ/m21f  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 oT\B-lx  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;}.jRmnJ  
static int KeyCount =0; !}l)okQH<#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ag:#82C  
#pragma data_seg() V BIPB  
BXZ( %tnY  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 !D7\$ g6g  
p#^L ZX  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: qVZ=:D{  
wrK$ZO]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR O<L /m[]  
cKey,UCHAR cMask) SKD!V6S  
{ o7DDL{iR/  
 BOOL bAdded=FALSE; e4khReF;  
 for(int index=0;index<MAX_KEY;index++){ j ;VYF  
  if(hCallWnd[index]==0){ QkGr{  
   hCallWnd[index]=hWnd; G?<L{J2"Q  
   HotKey[index]=cKey; 3|/ ;`KfQ  
   HotKeyMask[index]=cMask; jdXkU  
   bAdded=TRUE; ;s9!ra:3  
   KeyCount++; X'7 T"5!  
   break; cK@O)Ko}  
  } bsP:tFw>  
 } 0=t_ a]+  
 return bAdded; H+zQz8zMC  
} O JvEq@  
//删除热键 uLe+1`Y5Ux  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9oKRu6]D-  
{ *>$'aQ  
 BOOL bRemoved=FALSE; sFC1PdSk4T  
 for(int index=0;index<MAX_KEY;index++){ h&h]z[r R  
  if(hCallWnd[index]==hWnd){ }\JoE4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k8Qv>z  
    hCallWnd[index]=NULL; va~:oA  
    HotKey[index]=0; qW?^_  
    HotKeyMask[index]=0; yw#P<8{/[  
    bRemoved=TRUE; "y_$!KY%  
    KeyCount--; Wj8\~B=('  
    break; ]r'b(R; S  
   } 68;,hS*|6  
  } ?#,\,  
 } \<i#Jn+)  
 return bRemoved; VF<{Qx*  
} |Ro\2uSr  
hCQ{D|/  
Y5c( U)R8  
  DLL中的钩子函数如下: }9 qsPn  
XO"!)qF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #uuwzE*M_  
{ G5TdAW  
 BOOL bProcessed=FALSE; Nf<([8v;t  
 if(HC_ACTION==nCode) q^(A6W  
 { *M"lUw#(f  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 sBwkHsDD  
   switch(wParam) <ywxz1i  
   {  TD!QqLW  
    case VK_MENU: r}"T y  
     MaskBits&=~ALTBIT; d<`Z{"g NS  
     break; {3_M&$jN  
    case VK_CONTROL: @zsr.d6Q  
     MaskBits&=~CTRLBIT; ,i>5\Yl%  
     break; U~Uxs\0:  
    case VK_SHIFT: luat1#~J  
     MaskBits&=~SHIFTBIT; FZj tQ{M  
     break; k}F;e_  
    default: //judge the key and send message p1J%=  
     break; >'Y]C\  
   } |\~cjPX(  
   for(int index=0;index<MAX_KEY;index++){ P/M*XUG.  
    if(hCallWnd[index]==NULL) Bi?.G7>  
     continue; ?y ]3kU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~Z.lvdA_5  
    { .6e5w1r63  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8$?a?7,>|  
     bProcessed=TRUE; n?kU  
    } ${6 ;]ye  
   } He"> kJx  
  } }I05&/o.3p  
  else if((lParam&0xc000ffff)==1){ //有键按下 ^hY<avi6s  
   switch(wParam) u'Mq^8  
   { +]5JXt^  
    case VK_MENU: i` Lt=)@&  
     MaskBits|=ALTBIT; AHn^^'&x[  
     break; s)~Q@ze2  
    case VK_CONTROL: ={#r/x  
     MaskBits|=CTRLBIT; ApU5,R0  
     break; owmA]f  
    case VK_SHIFT: l~F,i n.  
     MaskBits|=SHIFTBIT; xjR/K&[m  
     break; L|!9%X0.  
    default: //judge the key and send message ZiVTc/b  
     break; ,^AkfOY7"  
   } (Q#A Br8  
   for(int index=0;index<MAX_KEY;index++){ 89'nbg  
    if(hCallWnd[index]==NULL) z~z.J ]  
     continue; DC[ -<:B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;9B:E"K?@1  
    { }6^(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); B0Xn9Tvk  
     bProcessed=TRUE; @-!w,$F)%d  
    } 2)4{  
   } A6TNtXk  
  } 96MRnj*Y[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 `(*5yXC  
   for(int index=0;index<MAX_KEY;index++){ HbZ3QWP  
    if(hCallWnd[index]==NULL) - bFz  
     continue; 7/Ve=7]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ywi Shvi8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); RX7,z.9@'O  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 OEq8gpqY  
   } TyGXDU  
  } D{a{$P r  
 } :tzCuK?e  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )WKe,:C  
} If]g6 B.=  
|}'}TYX0:  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: {,P&05iSi  
Z^h'&c#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '3%!Gi!g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P`V#Wj4\  
I-fs*yzj;8  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: zx;x@";p  
d:<{!}BR3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) tao3Xr^?  
{ /c3 DltOdr  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) VPtA %1  
 { xJc'tT6@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 rpDH>Hzq  
  SaveBmp(); "F)7!e  
  return FALSE; TxPP{6t  
 } (W*yF2r  
 …… //其它处理及默认处理 o7]h;Zg5r  
} w;>]L.n  
U/0NN>V  
"QGP]F  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 |D`Zi>lv  
p]=8=pE<  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 o?/N4$&5l  
9Z7o?S";  
  二、编程步骤 )h>Cp,|{  
[x-Z)Q. 5  
  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"; -$[=AqJXp;  
C.pNDpx-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; "6Ly?'H K  
G8akMd]2  
  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; $\m=-5 0-  
y~p7&^FeR  
  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; F}i rCi47c  
Hsx`P  
  5、 添加代码,编译运行程序。 Z*s/%4On  
_3hCu/BV  
三、程序代码 D[;6xJ  
iK=H9j  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL o(|`atvK  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3vVhE,1N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ F N(&3Ull  
#if _MSC_VER > 1000 %)\Cwl   
#pragma once DRf~l9f  
#endif // _MSC_VER > 1000 B3XVhUP  
#ifndef __AFXWIN_H__ 4?72TBl]  
#error include 'stdafx.h' before including this file for PCH fN8A'p[  
#endif h/eKVRGs"  
#include "resource.h" // main symbols kwZC 3p\\  
class CHookApp : public CWinApp fs~n{z,ja%  
{ 6Y\9h)1Jo  
 public: Njz,y}\  
  CHookApp(); 6q6&N'We  
  // Overrides `=%[  
  // ClassWizard generated virtual function overrides '<6Gz7O  
  //{{AFX_VIRTUAL(CHookApp)  X-~Q  
 public: ^'v6 ,*:4  
  virtual BOOL InitInstance(); YgdoQBQ  
  virtual int ExitInstance(); j!m~ :D  
  //}}AFX_VIRTUAL wF3mQ_hv:@  
  //{{AFX_MSG(CHookApp) v%86JUlK.  
  // NOTE - the ClassWizard will add and remove member functions here. +z("'Cv  
  // DO NOT EDIT what you see in these blocks of generated code ! P,D >gxl  
  //}}AFX_MSG r`wL_>"{n  
  DECLARE_MESSAGE_MAP() 5\EHu8  
}; 'HW(RC0dR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); (WN'wp  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >2>xr"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w&:h^u  
BOOL InitHotkey(); >\(Ma3S   
BOOL UnInit(); ,7/un8:%c  
#endif jwAO{.}T1r  
gh i!4  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. B:+}^=  
#include "stdafx.h" *%uv7G@%N  
#include "hook.h" MeP U`M--  
#include <windowsx.h> q)<5&|V  
#ifdef _DEBUG 9c#9KCmc  
#define new DEBUG_NEW McH*J j  
#undef THIS_FILE D95$  
static char THIS_FILE[] = __FILE__; .' D+De&y  
#endif HRx#}hN?+  
#define MAX_KEY 100 ;#fB=[vl";  
#define CTRLBIT 0x04 nb0<.ICF%R  
#define ALTBIT 0x02 5g/^wKhKG  
#define SHIFTBIT 0x01 K2:r7f  
#pragma data_seg("shareddata") dA\>z[n=  
HHOOK hHook =NULL; rYN`u  
UINT nHookCount =0; k_O"bsI)  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey LUS7-~:F  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 90I)"vfW5  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey UY%@i  
static int KeyCount =0; a,&Kvh  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Qpf BM  
#pragma data_seg() U|U/B  
HINSTANCE hins; ): Q5u6  
void VerifyWindow(); a; /4 ht  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &~||<0m  
//{{AFX_MSG_MAP(CHookApp) >fs-_>1d  
// NOTE - the ClassWizard will add and remove mapping macros here. v`beql  
// DO NOT EDIT what you see in these blocks of generated code! jnH44  
//}}AFX_MSG_MAP ecf<(Vl}  
END_MESSAGE_MAP() >[ 72]<6  
Z4h P  
CHookApp::CHookApp() HzH_5kVW  
{ Mt@K01MI%  
 // TODO: add construction code here, &sx/qS#,VL  
 // Place all significant initialization in InitInstance { H9pF2C  
} 0Xk;X1Xl  
w[4SuD  
CHookApp theApp; R&PQ[Xc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) a7#Eyw^H{  
{ Hvor{o5|tB  
 BOOL bProcessed=FALSE; ,u~\$ Az6  
 if(HC_ACTION==nCode) Wc`Vcn1  
 { +".&A#wU  
  if((lParam&0xc0000000)==0xc0000000){// Key up /:awPYGH<1  
   switch(wParam) #c/v2  
   { {fIH9+v  
    case VK_MENU: UPN2p&gM  
     MaskBits&=~ALTBIT; ;}|.crMF  
     break; nwcT8b 87J  
    case VK_CONTROL: 8Bhot,u'T  
     MaskBits&=~CTRLBIT; s8eiq`6\H}  
     break; 36Wuc@<H  
    case VK_SHIFT: F)DL/';  
     MaskBits&=~SHIFTBIT; H@aCo(#  
     break; UxzwgVT  
    default: //judge the key and send message ]e?*7T]  
     break; r OB\u|Pg  
   } mO> [kb"V'  
   for(int index=0;index<MAX_KEY;index++){ IwWo-WN7.  
    if(hCallWnd[index]==NULL) IFpmf0;^  
     continue; 9h*$P:S;1v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z:< (b   
    { ^D vaT9s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); E8NIH!dI  
     bProcessed=TRUE; ^T^U:Zdq  
    } {p6",d."N&  
   } |S>nfL{TQe  
  } TU[f"!z^  
  else if((lParam&0xc000ffff)==1){ //Key down S@_@hFV jd  
   switch(wParam) %R&3v%$y*  
   { ZMx_J  
    case VK_MENU: ?{{E/J:%  
     MaskBits|=ALTBIT; /!AdX0dx  
     break; gfr``z=>O  
    case VK_CONTROL: 7zQD.+&L  
     MaskBits|=CTRLBIT; %@pTEhpF  
     break; g08=D$P  
    case VK_SHIFT: eTrGFe!8w  
     MaskBits|=SHIFTBIT; J>Zd75;U  
     break; y)(SS8JR  
    default: //judge the key and send message A9tQb:  
     break; \N"K^kR4  
   } rZpc"<U  
   for(int index=0;index<MAX_KEY;index++) YrZAy5\  
   { cMK6   
    if(hCallWnd[index]==NULL) ?cg+RNI  
     continue; If4YqBG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M6DyOe<  
    { #axRg=d?K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {bc<0  
     bProcessed=TRUE; .v;2Q7X  
    } ?pQ, 5+8  
   } }T(|\ X  
  } vBM\W%T|d  
  if(!bProcessed){ ?0_i{BvN  
   for(int index=0;index<MAX_KEY;index++){ tbOe,-U-@  
    if(hCallWnd[index]==NULL) R9=,T0Y p  
     continue; jv_sRV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /9GqEQsfM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); c+4SGWmO  
   } +m>Kb edl  
  } GD< Afni  
 } $L`7(0U-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \nxt\KD  
} <T0-m?D_$  
R^8Opf_UN  
BOOL InitHotkey() QAb[M\G  
{ ^OA}#k NTW  
 if(hHook!=NULL){ *xLMs(gg  
  nHookCount++; KJ pM?:  
  return TRUE; wlKL|N  
 } @)}Vk  
 else 2'pxA:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 0s<o5`v  
  if(hHook!=NULL) 9"V27"s  
   nHookCount++; 8E0Rg/DnT  
  return (hHook!=NULL); KCCS7l/  
} rxDule3m  
BOOL UnInit() 0U$6TDtmE  
{ X.UIFcK^  
 if(nHookCount>1){ (Yw5X_|  
  nHookCount--; xX"?3%y>  
  return TRUE; Tmw :w~  
 } .s2d  
 BOOL unhooked = UnhookWindowsHookEx(hHook);  ^5 ;Y  
 if(unhooked==TRUE){ u\t ;  
  nHookCount=0; C($`'~b  
  hHook=NULL; ~:+g+Mf~[  
 } E+7S:B  
 return unhooked; /H3,v8J@  
} 9qqEr~  
jpBE| Nm  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4|:{apH  
{ 8-SVgo(  
 BOOL bAdded=FALSE; 1eb1Lvn  
 for(int index=0;index<MAX_KEY;index++){ =,0E3:X^  
  if(hCallWnd[index]==0){ p.l]% \QI  
   hCallWnd[index]=hWnd; FAQ:0 L$G  
   HotKey[index]=cKey; ?T4%"0  
   HotKeyMask[index]=cMask; Zn9w1ev  
   bAdded=TRUE; I1}{7-_t  
   KeyCount++; \XB71DUF  
   break; FG8bP  
  } zBjqYqZ<+  
 } o[cKh7&+  
 return bAdded; -rH3rKtf~  
} WO}JIExy  
1":{$A?OB  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Cch1"j<k$  
{ mIr{Wocx  
 BOOL bRemoved=FALSE; 2r* o  
 for(int index=0;index<MAX_KEY;index++){ ^ePSI|EW  
  if(hCallWnd[index]==hWnd){ WVo%'DtF`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ZE=~ re  
    hCallWnd[index]=NULL; L)w& f  
    HotKey[index]=0; 2"i<--Y  
    HotKeyMask[index]=0; \!YPht  
    bRemoved=TRUE; #lB[]2]N  
    KeyCount--; _;@kS<\N  
    break; |r /}r,t}  
   } _nTjCN625  
  } e=F' O] 5  
 } v4ueFEY  
 return bRemoved; liU=5 BL  
} Stp??  
o#+!H!C.O  
void VerifyWindow() iT|+<h  
{ -)$)<k  
 for(int i=0;i<MAX_KEY;i++){ 4ErDGYg}  
  if(hCallWnd!=NULL){ }e@j(*8  
   if(!IsWindow(hCallWnd)){ # =322bnO  
    hCallWnd=NULL; zJx<]=]  
    HotKey=0; -l,ib=ne  
    HotKeyMask=0; Ar):D#D  
    KeyCount--; }& 1_gn15  
   } zBoU;d%p>  
  } }~ +  
 } 9(@bjL465  
} hyTi':  
p jrA:;  
BOOL CHookApp::InitInstance() E|5gKp-wJ  
{ ]#*@<T*[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~ R*6w($  
 hins=AfxGetInstanceHandle(); GUcuD^Fe  
 InitHotkey(); |Y])|`_'G  
 return CWinApp::InitInstance(); 2cmqtlW"  
} [&zP$i&  
i "-#1vy=  
int CHookApp::ExitInstance() +ATN2 o  
{ .:lzT"QXI  
 VerifyWindow(); D<rjxP  
 UnInit(); ]&9f:5',  
 return CWinApp::ExitInstance(); Z v~ A9bB  
} q,*IR*B:a  
v =u|D$  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Mv9s  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) H?aB8=)  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ jn+0g:l  
#if _MSC_VER > 1000 "`3H0il;<  
#pragma once W"2\vo)  
#endif // _MSC_VER > 1000 ),~Ca'TU  
z.jGVF4  
class CCaptureDlg : public CDialog kKjYMYT6  
{ 3Ys|M%N  
 // Construction f5yd2wKy6  
 public: FF/MTd}6qG  
  BOOL bTray; |YlUt~H>  
  BOOL bRegistered; $[>wJXj3R  
  BOOL RegisterHotkey(); CId`6W  
  UCHAR cKey; C&;'Pw9H  
  UCHAR cMask; rSZWmns  
  void DeleteIcon(); 5Pr<%}[S^  
  void AddIcon(); 9Qkww&VEk  
  UINT nCount; JEP"2MN,  
  void SaveBmp(); fNK~z*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Tok"-$`N  
  // Dialog Data !?+3 jzG  
  //{{AFX_DATA(CCaptureDlg) Lc.7:r  
  enum { IDD = IDD_CAPTURE_DIALOG }; ~ h:^Q  
  CComboBox m_Key; ^< E,aCy  
  BOOL m_bControl; "~+K`*0r8  
  BOOL m_bAlt; qM9GW`CKA  
  BOOL m_bShift; s0`uSQ2X  
  CString m_Path; IBuuZ.=j2h  
  CString m_Number; .*zQ\P  
  //}}AFX_DATA |FcG$[  
  // ClassWizard generated virtual function overrides i/$lO de  
  //{{AFX_VIRTUAL(CCaptureDlg) U ^,ld`  
 public: PD$'xY|1=  
  virtual BOOL PreTranslateMessage(MSG* pMsg); `n%~#TJ  
 protected: ~M\s!!t3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ti'O 2k  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ck@[% ?  
  //}}AFX_VIRTUAL oOD|FrlY  
  // Implementation *%fOE;-?  
 protected: {<]abO  
  HICON m_hIcon; :WxMv~e{U  
  // Generated message map functions KS| $_-7 u  
  //{{AFX_MSG(CCaptureDlg) Y0b.utR&  
  virtual BOOL OnInitDialog(); <e=0J8V8,i  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wWm#[f],?  
  afx_msg void OnPaint(); _{ba  
  afx_msg HCURSOR OnQueryDragIcon(); |_ @iaLE  
  virtual void OnCancel(); gVD!.  
  afx_msg void OnAbout(); $Z(zO;k.  
  afx_msg void OnBrowse(); r*3;gyG.,#  
  afx_msg void OnChange(); m.$Oo Mu'  
 //}}AFX_MSG %v|,-B7Yx  
 DECLARE_MESSAGE_MAP() F(w>lWs;  
}; 4s"HO/  
#endif O-G@To3\  
iA< EJ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file eR}d"F4W  
#include "stdafx.h" RM`8P5i]sF  
#include "Capture.h" O/<jt'  
#include "CaptureDlg.h" V]<dh|x  
#include <windowsx.h> lS,Hr3Lz  
#pragma comment(lib,"hook.lib") c '(]n]a%  
#ifdef _DEBUG j[z\p~^  
#define new DEBUG_NEW \Js9U|lY  
#undef THIS_FILE =X1$K_cN  
static char THIS_FILE[] = __FILE__; $DQ -.WI  
#endif gz88$BT  
#define IDM_SHELL WM_USER+1 hyBSS,I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '}OrFN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !sLn;1l  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 6F<L4*4U  
class CAboutDlg : public CDialog : ._O.O  
{ /R,/hi Kx\  
 public: Wm\f:|U5`  
  CAboutDlg(); `"bm Hs7  
  // Dialog Data ogPfz/ hw  
  //{{AFX_DATA(CAboutDlg) oZ=e/\[K  
  enum { IDD = IDD_ABOUTBOX }; Lr+2L_/v`  
  //}}AFX_DATA 7f(UbO@BD  
  // ClassWizard generated virtual function overrides QvqBT  
  //{{AFX_VIRTUAL(CAboutDlg) i|=XW6J%  
 protected: cvC;QRx  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Npu;f>g0_  
  //}}AFX_VIRTUAL :2?'mKa7  
  // Implementation %TR->F  
 protected: 8"4`W~ 3  
  //{{AFX_MSG(CAboutDlg) H(g&+Wcu=  
  //}}AFX_MSG T"0a&.TLj  
  DECLARE_MESSAGE_MAP() 9!R!H&  
}; ^ ]B&7\w"t  
"W1q}4_  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =DqGm]tA  
{ t,H,*2  
 //{{AFX_DATA_INIT(CAboutDlg) )8vcg{b{d  
 //}}AFX_DATA_INIT s_kI\w4(x1  
} M'g4alS  
 (0k0gq;  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 'LX=yL]I  
{ [2 Rp.?  
 CDialog::DoDataExchange(pDX); F-ZD6l9O  
 //{{AFX_DATA_MAP(CAboutDlg) O ,DX%wk,  
 //}}AFX_DATA_MAP mtF&Z\ag  
} z1"UF4x*  
8C YJR/  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4o|~KX8Qz  
 //{{AFX_MSG_MAP(CAboutDlg) L@+j8[3BX  
 // No message handlers ^L[Z+7|  
 //}}AFX_MSG_MAP jQ[Z*^"}  
END_MESSAGE_MAP() 7kb`o y;(^  
&556;l  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) vWgh?h/ot  
: CDialog(CCaptureDlg::IDD, pParent) ) ejvT-  
{ {b+IDq`)=  
 //{{AFX_DATA_INIT(CCaptureDlg) g_}@/5?y  
  m_bControl = FALSE; G3e%~  
  m_bAlt = FALSE; gNO$WY^  
  m_bShift = FALSE; :bh[6 F  
  m_Path = _T("c:\\"); FTB"C[>  
  m_Number = _T("0 picture captured."); lF#Kg !-l  
  nCount=0; ]f-e/8$`@  
  bRegistered=FALSE; } K Ou  
  bTray=FALSE; WTd}) s  
 //}}AFX_DATA_INIT `|v#x@s  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &"CS1P|  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ck^Z,AKL+  
} PzF)Vg  
[Z[)hUXE?  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) >,9t<p=Q  
{ 5G2u(hx  
 CDialog::DoDataExchange(pDX); q`{.2yV  
 //{{AFX_DATA_MAP(CCaptureDlg) ?Jma^ S  
  DDX_Control(pDX, IDC_KEY, m_Key); O/5W-u  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); mki=.l$O  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Kp99y  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9R E;50h  
  DDX_Text(pDX, IDC_PATH, m_Path); w"Z >F]YZ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Uligr_c?  
 //}}AFX_DATA_MAP pu^1s#g8w  
} -ss2X  
Mu:H'$"'H  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) C= Zuy^  
//{{AFX_MSG_MAP(CCaptureDlg) Nd0Wt4=  
 ON_WM_SYSCOMMAND() weDv[b5i  
 ON_WM_PAINT() \Z~m6;  
 ON_WM_QUERYDRAGICON() oW8[2$_N+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) n^A=ar.  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) AfY(+w6!K  
 ON_BN_CLICKED(ID_CHANGE, OnChange) :@p`E}1r{  
//}}AFX_MSG_MAP nd?m+C&W  
END_MESSAGE_MAP() a@X'oV`(2b  
Kzmgy14o  
BOOL CCaptureDlg::OnInitDialog() X31kHK5F_  
{ "y`?KY$[N  
 CDialog::OnInitDialog(); 00Rk%QV  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tF'67,~W  
 ASSERT(IDM_ABOUTBOX < 0xF000); vXf#gX!Y  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .5T7O_%FP  
 if (pSysMenu != NULL) X(1.Hjh  
 { Ylf6-FbF  
  CString strAboutMenu; hVID~L$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 5-g02g  
  if (!strAboutMenu.IsEmpty()) `ybZE+S.  
  { E8503  
   pSysMenu->AppendMenu(MF_SEPARATOR);  aCTVY1  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); $~2A o[  
  } Fb*;5VNU.  
 } 2<'gX>TW  
 SetIcon(m_hIcon, TRUE); // Set big icon $X{& KLM[  
 SetIcon(m_hIcon, FALSE); // Set small icon [R~HhM  
 m_Key.SetCurSel(0); ~7k b4[  
 RegisterHotkey(); 1|%$ie  
 CMenu* pMenu=GetSystemMenu(FALSE); 7,jqA"9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7Jqp2\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $~j]/U  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [IYs4Y5  
 return TRUE; // return TRUE unless you set the focus to a control HsXFglQ  
} 9hq7:  
3)7'dM  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 1n,JynJ  
{ 6-^+btl)#  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)  "3v%|  
 { 4Pt0^;H&jn  
  CAboutDlg dlgAbout; D`gY6wX  
  dlgAbout.DoModal(); :4A^~+J  
 } qR1ez-#K  
 else q}8R>`Z{  
 { $@<\$I2s  
  CDialog::OnSysCommand(nID, lParam); U-Iwda8v  
 } J|>P,x#G  
} iGp@P=;m  
FkS{Z s  
void CCaptureDlg::OnPaint() }skXh_Vu4  
{ leiza?[  
 if (IsIconic()) {4Isz-P  
 { SQHV gj  
  CPaintDC dc(this); // device context for painting g"!B |  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); yZ2,AR%  
  // Center icon in client rectangle MdPwuXI  
  int cxIcon = GetSystemMetrics(SM_CXICON); !nd*U}q  
  int cyIcon = GetSystemMetrics(SM_CYICON); RS93_F8   
  CRect rect; "'8$hV65.p  
  GetClientRect(&rect); [~;9Mi.XL  
  int x = (rect.Width() - cxIcon + 1) / 2; U@*z#T#"m  
  int y = (rect.Height() - cyIcon + 1) / 2; Ufk7%`  
  // Draw the icon *s/F4?*  
  dc.DrawIcon(x, y, m_hIcon); d2(n3Xf  
 } 2 o.Mh/D0  
 else KSexG:Xb  
 { $`riB$v  
  CDialog::OnPaint(); ^ yfT7050  
 } ](O!6_'d  
} D4S>Pkv  
7<) .luV  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;TR.UUT  
{ @U9ov >E  
 return (HCURSOR) m_hIcon; m/{rmtA4  
} w,P2_xk`  
:8rqTBa`  
void CCaptureDlg::OnCancel() 'tdjPdw  
{ >Qi2;t~G  
 if(bTray) N_T;&wibO  
  DeleteIcon(); Z$@Juv&>5^  
  CDialog::OnCancel(); @hCGV'4  
} M^bujGD  
+XQS -=  
void CCaptureDlg::OnAbout() J"z8olV  
{ 1M+mH#?  
 CAboutDlg dlg; N#UyAm<9  
 dlg.DoModal(); _E1:3 N|  
} .|rpj&>g  
d6Z;\f7[  
void CCaptureDlg::OnBrowse() ;Z8K3p  
{ o|UZdGu  
 CString str; Bkcs4 x  
 BROWSEINFO bi; 8 /\rmf\  
 char name[MAX_PATH]; 3cs'Oz<w  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); T+gqu &9R  
 bi.hwndOwner=GetSafeHwnd(); *%MY. #  
 bi.pszDisplayName=name; GB{%4)%6  
 bi.lpszTitle="Select folder"; _|#)tWy}  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Bt.WRRpAB  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); $V@IRBm  
 if(idl==NULL) 3n,F5?! m  
  return; )Z]8SED  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9 Z4H5!:(  
 str.ReleaseBuffer(); T%:}/@  
 m_Path=str; qEywExdiu  
 if(str.GetAt(str.GetLength()-1)!='\\') J0{0B=d;  
  m_Path+="\\"; `?La  
 UpdateData(FALSE); k<AnTboa  
} WyO10yvR  
M,7v}[Tbl  
void CCaptureDlg::SaveBmp() v_b%2;<1  
{ OpiN,>;  
 CDC dc; **oN/5  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "EA%!P:d,  
 CBitmap bm; d^,u"Z9P  
 int Width=GetSystemMetrics(SM_CXSCREEN); UD .$C  
 int Height=GetSystemMetrics(SM_CYSCREEN); b2ZKhS8  
 bm.CreateCompatibleBitmap(&dc,Width,Height); V RT| OUq  
 CDC tdc; |J8c|h<  
 tdc.CreateCompatibleDC(&dc); 5I@< 6S&X  
 CBitmap*pOld=tdc.SelectObject(&bm); vQ 5 p  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); sqsBGFeG  
 tdc.SelectObject(pOld); \`x$@s?  
 BITMAP btm; qi$6y?  
 bm.GetBitmap(&btm); yQh":"$k  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; VJm).>E3k  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); uN'e~X6  
 BITMAPINFOHEADER bih; U t0oh  
 bih.biBitCount=btm.bmBitsPixel; aLG6yVtu  
 bih.biClrImportant=0; %\CsP!  
 bih.biClrUsed=0; P0|V1,)  
 bih.biCompression=0; \QQw1c+  
 bih.biHeight=btm.bmHeight; h19c*,0z!  
 bih.biPlanes=1; Sl{]Z,  
 bih.biSize=sizeof(BITMAPINFOHEADER); 0<fN<iR`  
 bih.biSizeImage=size; qA5tMZ^w  
 bih.biWidth=btm.bmWidth; RtN5\  
 bih.biXPelsPerMeter=0; ^ @sg{_.~l  
 bih.biYPelsPerMeter=0; =%p0r z|b  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); MsfY|(/m  
 static int filecount=0; l&[x)W  
 CString name; Ij4oH  
 name.Format("pict%04d.bmp",filecount++); j^>J*gLM}W  
 name=m_Path+name; ^Qq_|{vynf  
 BITMAPFILEHEADER bfh; IL&Mf9m  
 bfh.bfReserved1=bfh.bfReserved2=0; *ewE{$UpK  
 bfh.bfType=((WORD)('M'<< 8)|'B'); yX/ 9jk  
 bfh.bfSize=54+size; y&UcTE2;%(  
 bfh.bfOffBits=54; N<9C V!_  
 CFile bf; R9^Vk*`gFU  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ RYy_Ppn96f  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +A O(e  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); A-qdTJP  
  bf.WriteHuge(lpData,size); 6gNsh  
  bf.Close(); 3N[t2Y1r  
  nCount++; FG:(H0  
 } G-~+FnUC  
 GlobalFreePtr(lpData); 8-+Ce;h  
 if(nCount==1) 1d"g $i4e  
  m_Number.Format("%d picture captured.",nCount); &KmV tj  
 else }[\l$sS  
  m_Number.Format("%d pictures captured.",nCount); }e  s  
  UpdateData(FALSE); UXvUU^k"v  
} :!n_a*.{  
1=}+NK!  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9aHV~5  
{ g Q6_]~4  
 if(pMsg -> message == WM_KEYDOWN) V+(1U|@~  
 { !0i  
  if(pMsg -> wParam == VK_ESCAPE)  $TGE  
   return TRUE; <Y9%oJn%  
  if(pMsg -> wParam == VK_RETURN) /0A9d-Qd<  
   return TRUE; 9'Le}`Gf  
 } N8#wQ*MM>  
 return CDialog::PreTranslateMessage(pMsg); tZB" (\  
} p D-k<8|  
TgoaEufS<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]ri5mnB  
{ )[oegfnn-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ yb\T< *  
  SaveBmp(); sIJl9  
  return FALSE; dG2k4 O  
} Arc6d5Q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ aA7}>  
 CMenu pop; MAb*4e#  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); x-1RmL_%  
 CMenu*pMenu=pop.GetSubMenu(0);  qr~P$  
 pMenu->SetDefaultItem(ID_EXITICON); Jz<-B  
 CPoint pt; G)t_;iNL|  
 GetCursorPos(&pt); o<cg9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1DLAfsLlj  
 if(id==ID_EXITICON) > mk>VM  
  DeleteIcon(); I&vD >a5#  
 else if(id==ID_EXIT) 5$$Yce=k  
  OnCancel(); ]{ ^'{z$i  
 return FALSE; +N n $  
} l!qhK'']V"  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); |Tv}leJF  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =HapCmrx8  
 AddIcon(); >xsbXQ>.  
 return res; Vq-W|<7C=  
} <hkSbJF  
]ie38tX$  
void CCaptureDlg::AddIcon() F#-mseKhc  
{ ",O |uL  
 NOTIFYICONDATA data; >8M=RE n4  
 data.cbSize=sizeof(NOTIFYICONDATA); Bie#GKc  
 CString tip; 1K{u>T  
 tip.LoadString(IDS_ICONTIP); IyK^` y  
 data.hIcon=GetIcon(0); 6Ft?9 B(F:  
 data.hWnd=GetSafeHwnd(); 0gTv:1F /  
 strcpy(data.szTip,tip); Rxb?SBa  
 data.uCallbackMessage=IDM_SHELL; 3u[m? Vw  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; r ]s7a?O  
 data.uID=98; 3EkCM_]  
 Shell_NotifyIcon(NIM_ADD,&data); 5ir Ffr  
 ShowWindow(SW_HIDE); L)(JaZyV5  
 bTray=TRUE; 1V ,Mk#_  
} 7M8oI.?C|  
yzyBr1s  
void CCaptureDlg::DeleteIcon() 27J!oin$  
{ N> 7sG(!'"  
 NOTIFYICONDATA data; A#7/,1h\  
 data.cbSize=sizeof(NOTIFYICONDATA); )+7|_7 !x  
 data.hWnd=GetSafeHwnd(); nwS @r  
 data.uID=98; u1 Z;n  
 Shell_NotifyIcon(NIM_DELETE,&data); |#(KP  
 ShowWindow(SW_SHOW); pmwVVUEQ  
 SetForegroundWindow(); = -bGH   
 ShowWindow(SW_SHOWNORMAL); )_C+\K*  
 bTray=FALSE; 'Dn\.x^]1  
} [J!jp& o  
c V$an  
void CCaptureDlg::OnChange() $Z|HFV{  
{ b!p]\B!  
 RegisterHotkey(); NMs 8^O|0  
} r{cmw`WA/P  
[g<Y,0,J  
BOOL CCaptureDlg::RegisterHotkey() r{>`"  
{ `uP:UQ9S  
 UpdateData(); =Gv*yR*]t  
 UCHAR mask=0; ~%chF/H  
 UCHAR key=0; z`}z7e'>  
 if(m_bControl) 6.Jvqn  
  mask|=4; & zR\Rmpt  
 if(m_bAlt) 3#A4A0  
  mask|=2; &L[i"1a  
 if(m_bShift) +$}3=n34)  
  mask|=1; Bo,>blspw  
  key=Key_Table[m_Key.GetCurSel()]; |`|#-xu  
 if(bRegistered){ HVdy!J  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^r=Wj@`  
  bRegistered=FALSE; @>fsg-|  
 } *"nN To  
 cMask=mask; hv0bs8h  
 cKey=key; dzQs7D}  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); x{O) n  
 return bRegistered; ]4ib^R~Z  
} 5^ck$af  
\wV^uS   
  四、小结 O=[Q >\p  
N_^PoX935O  
  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 或 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