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:
xmI!N0eta
AvS<b3EoN 一、实现方法
HMymoh$Q W%bzA11l 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
+7]]=e<[E ?i8a)!U #pragma data_seg("shareddata")
Z* Fxr;)d HHOOK hHook =NULL; //钩子句柄
R!8 qkG UINT nHookCount =0; //挂接的程序数目
w`")^KXi static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
,xeJf6es static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
>w~Hq9 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
[aF^ D;o static int KeyCount =0;
sD[G?X static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
X!vBD #pragma data_seg()
@{|vW 0$~zeG" 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。
2#y!(D8 TZ2-%k# 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:
/Dl{I7W n\ yDMY BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
TzJp3 cKey,UCHAR cMask)
fi6i{(K {
<lBY BOOL bAdded=FALSE;
-J$,W`#z for(int index=0;index<MAX_KEY;index++){
eiJ13`T if(hCallWnd[index]==0){
>8*J ;(:W hCallWnd[index]=hWnd;
2!u4nxZ. HotKey[index]=cKey;
P'dH*}H HotKeyMask[index]=cMask;
/kLG/ry8l: bAdded=TRUE;
sKvz<7pag KeyCount++;
j6NK7Li break;
f`dQ $Kh }
1+f>tv }
cM= ?{W7~ return bAdded;
bh9!OqK9K }
9F&s9(=\ //删除热键
9HjtWQn BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-f+U:/'.>v {
1m52vQSo3l BOOL bRemoved=FALSE;
_h=kjc}[.O for(int index=0;index<MAX_KEY;index++){
Q>,EYb>wI if(hCallWnd[index]==hWnd){
^"g # ! if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
U=<d;2N# hCallWnd[index]=NULL;
h]6"~ m HotKey[index]=0;
jI-\~ HotKeyMask[index]=0;
0gs0[@ bRemoved=TRUE;
\
nIz5J}3 KeyCount--;
/qYo*S_cG break;
w
A0$d }
u9.x31^ }
E7_)P>aS5 }
x2^Yvgc- return bRemoved;
Z`?Z1SBt }
WxN@&g( !yo/ F&6 h;^H*Y&` DLL中的钩子函数如下:
~s
:Ml cVg!" LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
qMk"i@" {
9{{|P= BOOL bProcessed=FALSE;
RY>BP[h if(HC_ACTION==nCode)
8f^QO: {
?f\;z<e| if((lParam&0xc0000000)==0xc0000000){// 有键松开
`*A!vO8 switch(wParam)
E5#Dn.!~ {
$*%ipD}f case VK_MENU:
V!sT2 MaskBits&=~ALTBIT;
f`8]4ms" break;
;W/K7} case VK_CONTROL:
*K{-J* MaskBits&=~CTRLBIT;
5pOb;ry")` break;
rNdeD~\ case VK_SHIFT:
+w(sDH~kd MaskBits&=~SHIFTBIT;
=Me94w>G3X break;
P4M*vZq) default: //judge the key and send message
:GXD-6}^| break;
P,$|.pd' }
S(K}.C1x for(int index=0;index<MAX_KEY;index++){
D!K){E if(hCallWnd[index]==NULL)
v4?qI >/ continue;
k/"^W.B aj if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
's.cwB: # {
,qx;kJJ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
FmRCTH bProcessed=TRUE;
Cr!}qZq }
xKilTh_.6 }
nLA8Hy"8z }
;1S~'B&1Q else if((lParam&0xc000ffff)==1){ //有键按下
%0>DjzYt switch(wParam)
e?Pzhha {
EFb1Y{u^\! case VK_MENU:
S%h[e[[fST MaskBits|=ALTBIT;
&rTOJ1)V} break;
WUVRwJ 5 case VK_CONTROL:
R]0p L MaskBits|=CTRLBIT;
Im
NTk break;
So?ScX\lG case VK_SHIFT:
])d_B\)Kck MaskBits|=SHIFTBIT;
w]4=uL6 break;
6`KAl rH default: //judge the key and send message
TRQ@=. break;
&f}a` /{@ }
=%p%+F@RlW for(int index=0;index<MAX_KEY;index++){
&P+7Um( if(hCallWnd[index]==NULL)
_\HMF continue;
$=7'Cm? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Z9:erKT {
-&PiD SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
.'zXO bProcessed=TRUE;
o"O=Epg }
TM|M#hMS }
K~j&Q{yws@ }
7Z-'@m if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
f0uzoeL<% for(int index=0;index<MAX_KEY;index++){
{-(}p+;z if(hCallWnd[index]==NULL)
#Y*?kTF continue;
`rt if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
6mP
s;I SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
EXlmIY4 //lParam的意义可看MSDN中WM_KEYDOWN部分
}GIwYh/ }
^CIO,I }
Dg^n`[WO }
q[6tvPfkX return CallNextHookEx( hHook, nCode, wParam, lParam );
Uu~7+oaQ }
<ptgFR+ jo75MSj 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
X^!n'$^u %LeQpbyOR BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
T#;W5<" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
/ S32)=( d|GQZAEJEt 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:
c/l%:!A bRSE"B LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
mWOW39Ku {
t')47k\ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
:%[=v(G[ {
AJk0jh\.j% //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
hf6=`M}>i SaveBmp();
U(lcQC`$ return FALSE;
bSOxM/N }
K?;_T$^K …… //其它处理及默认处理
==zt)s.G(+ }
)
>_xHc ? sVk+E'q VrV
)qfG 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
X9W'.s.[Q \rXmWzl{ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
NSQ}:m (IlHg^" 二、编程步骤
7Hghn"ol -6 WjYJx 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
i!H)@4jX YX A|1 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
1J`<'{* AYhWeI+ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
IM.sW'E p~Tp=d)/ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
HaJs)j MQs!+Z"m> 5、 添加代码,编译运行程序。
ChvSUaCS 4LG[i}u.N 三、程序代码
[NG~FwpRf 4Zz%vY ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
hv)>HU& #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
,;3bPjey #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
kJQH{n+)R #if _MSC_VER > 1000
F$L2bgQR?' #pragma once
Nk.m$ #endif // _MSC_VER > 1000
OyI?P_0u #ifndef __AFXWIN_H__
<x QvS^|[ #error include 'stdafx.h' before including this file for PCH
d=`a-R0 #endif
v'Y0|9c #include "resource.h" // main symbols
\,UpFuU\ class CHookApp : public CWinApp
uDtml$9rN {
Cz1Q@<) public:
/KU9sIE; CHookApp();
/"(`oe< // Overrides
M =/+q // ClassWizard generated virtual function overrides
JfOBZQ //{{AFX_VIRTUAL(CHookApp)
?;GbK2\bj public:
'E\/H17 virtual BOOL InitInstance();
fL^$G;_?3 virtual int ExitInstance();
-_*ux! //}}AFX_VIRTUAL
DOaTp f //{{AFX_MSG(CHookApp)
]\~s83?X // NOTE - the ClassWizard will add and remove member functions here.
9"W 3t] // DO NOT EDIT what you see in these blocks of generated code !
c-GS:'J{ //}}AFX_MSG
~U;M1> DECLARE_MESSAGE_MAP()
;[qA?<GJ };
&i(\g7%U LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
5dvP~sw BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
{PGiNY%q BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
o+],L_Ab BOOL InitHotkey();
1Yk!R9. BOOL UnInit();
Io;x~i09K #endif
0hNgr' Ad}Nc"O //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
<)68ol~< #include "stdafx.h"
(]@yDb4 #include "hook.h"
qjm6\ii:) #include <windowsx.h>
(DIMt-wz #ifdef _DEBUG
wsKOafrV #define new DEBUG_NEW
Jkx_5kk/\ #undef THIS_FILE
'bQjJRq! static char THIS_FILE[] = __FILE__;
|j2$G~B6 #endif
7&hhKEA #define MAX_KEY 100
XLgp.w; #define CTRLBIT 0x04
_:1s7EC #define ALTBIT 0x02
"C]v #define SHIFTBIT 0x01
On~w` #pragma data_seg("shareddata")
,I2x&Ys&. HHOOK hHook =NULL;
@oNYMQ@)d UINT nHookCount =0;
CcJ%;.V,T static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
!'z"V_x~ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Ajm static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
&*Z"r* static int KeyCount =0;
Z~3 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
shZEE2Dr #pragma data_seg()
#rI4\K HINSTANCE hins;
O<`N0 void VerifyWindow();
ysH'X95 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
f
q&(&(| //{{AFX_MSG_MAP(CHookApp)
>^~W'etX| // NOTE - the ClassWizard will add and remove mapping macros here.
oFi_
op // DO NOT EDIT what you see in these blocks of generated code!
D & Bdl5g //}}AFX_MSG_MAP
/tG[pg{[ END_MESSAGE_MAP()
"oT&KW w }=LC#le CHookApp::CHookApp()
%BwvA_T'Q {
.)c+gyaQ // TODO: add construction code here,
s$Vz1B // Place all significant initialization in InitInstance
bO'?7=SC }
z7s}-w, cz41<SFL CHookApp theApp;
S[e> 8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
IMSLHwZ {
Ou] !@s BOOL bProcessed=FALSE;
T(=Z0M if(HC_ACTION==nCode)
RZ0+Uu/J {
C/!7E: if((lParam&0xc0000000)==0xc0000000){// Key up
pG^>y0 switch(wParam)
|Sv}/P- {
WS.lDMYE7 case VK_MENU:
(&1565 MaskBits&=~ALTBIT;
>ra)4huZ break;
)@],0yL case VK_CONTROL:
GGU>={D) MaskBits&=~CTRLBIT;
x3l~k Z( break;
wW,
n~W case VK_SHIFT:
iBk1QRdn MaskBits&=~SHIFTBIT;
gLwrYG7@ break;
&3|l4R\ default: //judge the key and send message
r8Z.}<j break;
/], 9N }
{ceY:49 for(int index=0;index<MAX_KEY;index++){
BUUc9&f3o if(hCallWnd[index]==NULL)
Z=beki] continue;
>W6?!ue_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
E/2_@&U:} {
v$Xoxp SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
bh+m_$X~ bProcessed=TRUE;
t]hfq~Ft }
~{ucr#]C }
K(AZD&D }
WJ/X`?k else if((lParam&0xc000ffff)==1){ //Key down
UHS"{% switch(wParam)
M9.FtQhK/ {
@CS%=tE}U case VK_MENU:
)
D5JA` MaskBits|=ALTBIT;
s)#TT9BbV break;
L\q-Z.. case VK_CONTROL:
p@eW*tE MaskBits|=CTRLBIT;
S;tvt/\!Z break;
mZ g' case VK_SHIFT:
M%OUkcWCk MaskBits|=SHIFTBIT;
9?uU%9r5P break;
jd.w7.8 default: //judge the key and send message
|<JBoE]3B break;
WO*dO9O }
Q!(qb for(int index=0;index<MAX_KEY;index++)
M4e8PRlI {
:464~tHI[` if(hCallWnd[index]==NULL)
"(iQ-g Mm continue;
;pqS|ayl if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
w3M F62: {
1-.(pA' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
zd=N. bProcessed=TRUE;
Qp-P[Tc }
$49;\pBZl }
cRWYS[O?- }
Bqw/\Lxwlf if(!bProcessed){
v!#koqd1y. for(int index=0;index<MAX_KEY;index++){
YoSBS if(hCallWnd[index]==NULL)
|`d-;pk!% continue;
>+@EU) if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
9O\yIL SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
zor }
@&GY5<&b }
n`D-?]* }
HMw}pp: return CallNextHookEx( hHook, nCode, wParam, lParam );
} a!HbH }
]'<"qY |Ew&. fgz BOOL InitHotkey()
- H`,`#{ {
zANsv9R~ if(hHook!=NULL){
I.p"8I; nHookCount++;
:/6u*HwZh return TRUE;
@Py?.H }
VP^{-mDph else
HBZtg hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
eIbz`|%3 if(hHook!=NULL)
j|VX6U
nHookCount++;
o`nJJ:Cxq- return (hHook!=NULL);
{*X|)nr }
:`S\p[5 BOOL UnInit()
:MGIp%3 {
o),@I#fM if(nHookCount>1){
EV_u8?va nHookCount--;
ODKS6E1{ return TRUE;
Is!+`[ma }
!*}E BOOL unhooked = UnhookWindowsHookEx(hHook);
,S1'SCwVdJ if(unhooked==TRUE){
Ll`nO;h nHookCount=0;
`m\ ?gsw7 hHook=NULL;
nbBox,zW }
)jMk~;'r return unhooked;
pz]KUQ }
fwSI"cfM d6A+pa'2 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
v"dl6%D" {
CL5t6D9Qi BOOL bAdded=FALSE;
B~%SB/eu for(int index=0;index<MAX_KEY;index++){
E#\'$@8j if(hCallWnd[index]==0){
FB
O_B hCallWnd[index]=hWnd;
~uuM0POo HotKey[index]=cKey;
$Q`\- HotKeyMask[index]=cMask;
X`7O%HiX/` bAdded=TRUE;
6\m'MV`R! KeyCount++;
4TcW% break;
jtPHk*>^wu }
sbV_h;< }
-_f-j return bAdded;
Z
)X( }
6t4{aa!L|9 ,1i l& BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
u4Z
Accj {
g?> BOOL bRemoved=FALSE;
LF!S`|FF for(int index=0;index<MAX_KEY;index++){
XZxzw*Y1J if(hCallWnd[index]==hWnd){
hho\e
8 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
8[IR;gZf hCallWnd[index]=NULL;
nDXy$f8 HotKey[index]=0;
]u%Y8kBe HotKeyMask[index]=0;
1fV\84m^ bRemoved=TRUE;
}5y]kn KeyCount--;
3#h@,>Z; break;
Ar`U/ %Cu }
?aU-Y_pMe }
OmaG|2u }
e_llW(*l8^ return bRemoved;
8-)@q| }
KvlLcE~`o D#11
N^-K void VerifyWindow()
+P=I4-?eX {
}Q_ }c9? for(int i=0;i<MAX_KEY;i++){
!H`uN
if(hCallWnd
!=NULL){ I_na^sh*
if(!IsWindow(hCallWnd)){ =]0AZ
hCallWnd=NULL; _@sSVh$+
HotKey=0; YF13&E2`\
HotKeyMask=0; zC!Pb{IaH
KeyCount--; |]OI)w*
} =Ka :i>
} ^ ]SU (kY
} Yu|L6#[E
} Xl/2-'4
S{JBV@@tC
BOOL CHookApp::InitInstance() <s5s<q2
{
k;vhQ=
AFX_MANAGE_STATE(AfxGetStaticModuleState()); $ !:xjb
hins=AfxGetInstanceHandle(); 3@mW/l>X
InitHotkey(); /XwwB
return CWinApp::InitInstance(); f/g-b]0
} s@|TQ9e |j
LS4E.Xdn
int CHookApp::ExitInstance() 01o,9_|FL
{ ;h7O_|<%
VerifyWindow(); >('Z9<|r:
UnInit(); "@@Z{
return CWinApp::ExitInstance(); ` MXGEJF
} C8
"FTH'
/@]@Tz@'
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file CM+/.y T
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) O-]^_LV`
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Yx<wYzD
#if _MSC_VER > 1000 TRQH{O\O
#pragma once PA>su)N$
#endif // _MSC_VER > 1000 k_7agW
sQ%gf
class CCaptureDlg : public CDialog s%t =*+L\
{ Z;J{&OJ3qM
// Construction \m1jV>q
public: <k-hRs2d
BOOL bTray; IsP!ZcV;
BOOL bRegistered; |BA<> WE
BOOL RegisterHotkey(); K_LwYO3
UCHAR cKey; .l~g`._
UCHAR cMask; JiCy77H
void DeleteIcon(); G>0hi1
void AddIcon(); N1u2=puJY
UINT nCount; +v"%@lC};
void SaveBmp(); -gb'DN1BG
CCaptureDlg(CWnd* pParent = NULL); // standard constructor =j
S
// Dialog Data '1Q [&
//{{AFX_DATA(CCaptureDlg) 5tl uS
enum { IDD = IDD_CAPTURE_DIALOG }; GYNLyd)
CComboBox m_Key; XLsOn(U\&
BOOL m_bControl; ;n=A245W\
BOOL m_bAlt; "\1QJ
BOOL m_bShift; *p7_rY
CString m_Path; xsSX~`
CString m_Number; {A MoE+U
//}}AFX_DATA \o{rw0w0
// ClassWizard generated virtual function overrides nwPU{4#l<
//{{AFX_VIRTUAL(CCaptureDlg) xzTF| Z\
public: {]dH+J7
virtual BOOL PreTranslateMessage(MSG* pMsg); 9U~sRj=D
protected: #dxS QmG
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?<-ins
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7.tEi}O&_g
//}}AFX_VIRTUAL ;B@-RfP
// Implementation :pPn)j$
protected: Hnc<)_DF
HICON m_hIcon; ]~-vU{
// Generated message map functions UIi`bbJ
//{{AFX_MSG(CCaptureDlg) "=\@
a=
virtual BOOL OnInitDialog(); 9V( esveq
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _=;lt O
afx_msg void OnPaint(); JLH,:2
afx_msg HCURSOR OnQueryDragIcon(); j9/Ev]im|F
virtual void OnCancel(); RTRi{p
afx_msg void OnAbout(); %H'*7u2
afx_msg void OnBrowse(); <P4*7:jX
afx_msg void OnChange(); {kp^@
//}}AFX_MSG IYk^eG:;
DECLARE_MESSAGE_MAP() N_),'2
}; 26<Wg7/,
#endif AV*eGzz`
yCG<qQz
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -C<Ni
#include "stdafx.h" l9X\\uG&
#include "Capture.h" Kk_h&by?
#include "CaptureDlg.h" {r2fIj~V
#include <windowsx.h> #8[iqvE
#pragma comment(lib,"hook.lib") @CU~3Md*
#ifdef _DEBUG [Y=X^"PF
#define new DEBUG_NEW =j{r95)|u
#undef THIS_FILE ~ GW8|tw
static char THIS_FILE[] = __FILE__; xRU ~hQ
#endif O9tgS@*Tv
#define IDM_SHELL WM_USER+1 Ee?+IZ H7|
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }./_fFN@
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X ?l F,p
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hpVu
class CAboutDlg : public CDialog I{0bsTp;
{ eX@7f!uz
public: @ dF]X
CAboutDlg(); /P3s.-sL
// Dialog Data /K@{(=n
//{{AFX_DATA(CAboutDlg) p>@S61
&
[
enum { IDD = IDD_ABOUTBOX }; WgK |r~
//}}AFX_DATA mC}!;`$8p
// ClassWizard generated virtual function overrides ']]&<B}mz
//{{AFX_VIRTUAL(CAboutDlg) /NDuAjp[@
protected: >)IXc<"wq
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;y{VdT
//}}AFX_VIRTUAL J|BZ{T}d
// Implementation ttK`*Ng
protected: Jqt&TqX@s
//{{AFX_MSG(CAboutDlg) hIr$^%
//}}AFX_MSG k-LT'>CWl
DECLARE_MESSAGE_MAP() &PAgab2$
}; ?$T39U^
#1C~i}J1
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) r4D6I,
{ *KXg;777
//{{AFX_DATA_INIT(CAboutDlg) l< y9ue=
//}}AFX_DATA_INIT l^IPN'O@
} (3=(g
7Z;w<b~
void CAboutDlg::DoDataExchange(CDataExchange* pDX) K~# wvUb
{ !^|%Z
CDialog::DoDataExchange(pDX); I'[hvp
//{{AFX_DATA_MAP(CAboutDlg) !j3V'XU#Zn
//}}AFX_DATA_MAP y ;4h'y>#
} r12{XW?~
=!#iC?I
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^!*?vHx:
//{{AFX_MSG_MAP(CAboutDlg) <}E^r_NvD
// No message handlers /I'n]
//}}AFX_MSG_MAP Hhbf9)
END_MESSAGE_MAP() 7\
<4LX
Jb~ -)n2
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Ur626}
: CDialog(CCaptureDlg::IDD, pParent) G=8w9-Ww
{ 4nhe *ip
//{{AFX_DATA_INIT(CCaptureDlg) I@=h|GM
m_bControl = FALSE; %}=$HwN)
m_bAlt = FALSE; 3"gifE
m_bShift = FALSE; bw7!MAXd
m_Path = _T("c:\\"); :{9|/a
m_Number = _T("0 picture captured."); ~?}/L'q!b
nCount=0; ?CS
jn
bRegistered=FALSE; ;UgRm#
bTray=FALSE; \ooqa<_
//}}AFX_DATA_INIT /S;o2\
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7F-b/AdVq
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); #^Dc:1,
} g[;iVX^1&
Ar sMqb
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) r1FE$R~C=
{ Q;P ~'
CDialog::DoDataExchange(pDX); D^PsV
//{{AFX_DATA_MAP(CCaptureDlg) ![5<\
DDX_Control(pDX, IDC_KEY, m_Key); c
3@SgfKmk
DDX_Check(pDX, IDC_CONTROL, m_bControl); Xh]\q)
DDX_Check(pDX, IDC_ALT, m_bAlt); B>?Y("E
DDX_Check(pDX, IDC_SHIFT, m_bShift); .Qh8I+Q%
DDX_Text(pDX, IDC_PATH, m_Path); xgR* j
DDX_Text(pDX, IDC_NUMBER, m_Number); v%<_Mh
//}}AFX_DATA_MAP IQ{Xj3;?y
} =X X_Cnn
(?\ZN+V)
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) RQ,(?I*8\
//{{AFX_MSG_MAP(CCaptureDlg) ?<frU ,{
ON_WM_SYSCOMMAND() 73~Mq7~8
ON_WM_PAINT() 7IJb$af:;
ON_WM_QUERYDRAGICON() w=e,gNO
ON_BN_CLICKED(ID_ABOUT, OnAbout) YY!(/<VI
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) zFi+6I$
ON_BN_CLICKED(ID_CHANGE, OnChange) ;(0:6P8I
//}}AFX_MSG_MAP &`L5UX
END_MESSAGE_MAP() TjI NxP-O
:=L[kzX
BOOL CCaptureDlg::OnInitDialog() ^y6Pkb
P
{ n'*L jp
CDialog::OnInitDialog(); 6 qKIz{;
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); e3>Re![_.
ASSERT(IDM_ABOUTBOX < 0xF000); )N=b<%WD
CMenu* pSysMenu = GetSystemMenu(FALSE); ?XOeMI
if (pSysMenu != NULL) /#G"'U/
{ eBAB7r/7
CString strAboutMenu; nnGA_7-t
strAboutMenu.LoadString(IDS_ABOUTBOX); [!R%yD;
if (!strAboutMenu.IsEmpty()) !RcAJs'
{ Ok`U*j
pSysMenu->AppendMenu(MF_SEPARATOR); Mz++SPG7
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _Mt:^H}Sy
} 8&C(0H]1
} pV("NJj!
SetIcon(m_hIcon, TRUE); // Set big icon $m=z87hX
SetIcon(m_hIcon, FALSE); // Set small icon 1UM]$$:i
m_Key.SetCurSel(0); <dYk|5AdLF
RegisterHotkey(); >Au<y,Tw
CMenu* pMenu=GetSystemMenu(FALSE); hE6tu'
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); G>RYQ{O
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \7j)^
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); FoG<$9
return TRUE; // return TRUE unless you set the focus to a control ?*s!&-KI
} kN$70N7I;
kx=AX*I
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Ys_YjlMIbl
{ ppnj.tLz;r
if ((nID & 0xFFF0) == IDM_ABOUTBOX) o7T|w~F~R
{ 7.Mh$?;i9
CAboutDlg dlgAbout; iE Oyc59
dlgAbout.DoModal(); #]
GM#.
} 5?fk;Q9+\
else 2DC#PX)i
{ ww,c)$
CDialog::OnSysCommand(nID, lParam); >ATW/9r
} eLYFd,?9
} f!J^vDl
\O:xw-eG
void CCaptureDlg::OnPaint() `/AzX *`
{ UJH{vjIv
if (IsIconic()) $~YuS_sYg
{ `l+SJLyJ%
CPaintDC dc(this); // device context for painting 1}uDgz^
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <di_2hN
// Center icon in client rectangle =z3jFaZ
int cxIcon = GetSystemMetrics(SM_CXICON); Fq9[:
int cyIcon = GetSystemMetrics(SM_CYICON); _Nn!SE
CRect rect; Xdq,
=;
GetClientRect(&rect); 19.cf3Dh
int x = (rect.Width() - cxIcon + 1) / 2; ".)_kt[
int y = (rect.Height() - cyIcon + 1) / 2; #~x5}8
// Draw the icon _5T7A><q<
dc.DrawIcon(x, y, m_hIcon); +Y~+o-_
} /(V=Um^0
else |u{QI3#'
{ Pp/{keEye
CDialog::OnPaint(); v/czW\z
} @EY}iK~
} 3I5WDuq
#I?iR3u
HCURSOR CCaptureDlg::OnQueryDragIcon() i-?zwVmn
{ QVW6SY
return (HCURSOR) m_hIcon; $P(nh'\
} hQm4R]a
#& wgsGV8C
void CCaptureDlg::OnCancel() a+/|O*>#
{ gn"&/M9E
if(bTray) ^eW.hNg
DeleteIcon(); <dL04F
CDialog::OnCancel(); }BJ1#<
} AE&n^vdQW
6Qb)Uq3}]
void CCaptureDlg::OnAbout() zb/Xfu.)?6
{ IBkH+j
CAboutDlg dlg; wWw/1i:|'
dlg.DoModal(); g&TCff
} RuNH
(>Eb
#`4^zU)
void CCaptureDlg::OnBrowse() ~{YgM/c|dt
{ o'7ju~0L
CString str; G=cH61
BROWSEINFO bi; k6L373e#Q
char name[MAX_PATH]; ;lH,bX~5
ZeroMemory(&bi,sizeof(BROWSEINFO)); F[=lA"F^
bi.hwndOwner=GetSafeHwnd(); X&s\_jQ
bi.pszDisplayName=name; `_U0>Bfg;
bi.lpszTitle="Select folder"; -0SuREn
bi.ulFlags=BIF_RETURNONLYFSDIRS; bM^A9BxD
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ff1B)e
if(idl==NULL) )75yv<L2S,
return; hS{
*l9v7
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "tB"j9Jb
str.ReleaseBuffer(); zXPJ;^Xxa
m_Path=str; 'Y{ux>
if(str.GetAt(str.GetLength()-1)!='\\') xO<-<sRA
m_Path+="\\"; pZ~>l=-
UpdateData(FALSE); J5p!-N`NS
} N E2sD
C.)&FW2F_
void CCaptureDlg::SaveBmp() Usf"K*A
{ J
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CDC dc; &tz%WW%D8
dc.CreateDC("DISPLAY",NULL,NULL,NULL); |vDoqlW
CBitmap bm; x";.gjI |g
int Width=GetSystemMetrics(SM_CXSCREEN); B
Ff.Rd95
int Height=GetSystemMetrics(SM_CYSCREEN); 0rJ\e
bm.CreateCompatibleBitmap(&dc,Width,Height); bC4*w
O
CDC tdc; {9.~]dI|L
tdc.CreateCompatibleDC(&dc); G'?f!fz;
CBitmap*pOld=tdc.SelectObject(&bm); e4YfTr
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); CDwIq>0j
tdc.SelectObject(pOld); xDA,?i;T
0
BITMAP btm; {iIg 4PzrU
bm.GetBitmap(&btm); dbT^9: Q
DWORD size=btm.bmWidthBytes*btm.bmHeight; b|ksMB>)
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); },EUcVXk
BITMAPINFOHEADER bih; <x0uO
bih.biBitCount=btm.bmBitsPixel; N 1f~K.e\
bih.biClrImportant=0; &>zy_)
bih.biClrUsed=0; b!5tFX;J
bih.biCompression=0; \LoSUl
i
bih.biHeight=btm.bmHeight; f-v ND'@
bih.biPlanes=1; n?e@):
bih.biSize=sizeof(BITMAPINFOHEADER); !OoaE* s
bih.biSizeImage=size; fyg~KF}
bih.biWidth=btm.bmWidth; "Eok;io
bih.biXPelsPerMeter=0; Avv
bih.biYPelsPerMeter=0; nL+YL
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \p@nH%@v
static int filecount=0; 1f@U:<:
CString name; xH`j7qK.
name.Format("pict%04d.bmp",filecount++); $-fj rQ
name=m_Path+name; ^=izqh5S
BITMAPFILEHEADER bfh; [Z5}2gB&
bfh.bfReserved1=bfh.bfReserved2=0; 3h[:0W!C]
bfh.bfType=((WORD)('M'<< 8)|'B'); 76IALJ00V
bfh.bfSize=54+size; t.>te'DK/
bfh.bfOffBits=54; 71L\t3fG
CFile bf; fD\^M{5f
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ gB{]yA"('
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =hugnX<9
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); B'KXQa-$O
bf.WriteHuge(lpData,size); P$(WdVG
bf.Close(); CFkW@\]
nCount++; zqvRkMWc M
} ,Y g5X
GlobalFreePtr(lpData); hk"9D<&i>b
if(nCount==1) n $O.>
m_Number.Format("%d picture captured.",nCount); 6cQeL$,SQ
else y?Hj%,
m_Number.Format("%d pictures captured.",nCount); j:v~MrQ7|
UpdateData(FALSE); BYr_Lz|T
} y?*[}S
1C}pv{0:&
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) RFZU}.*K$
{ ~C/Yv&58
if(pMsg -> message == WM_KEYDOWN) As6)_8w
{ xJ=ZQ)&]
if(pMsg -> wParam == VK_ESCAPE) F=
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return TRUE; n!kk~65|
if(pMsg -> wParam == VK_RETURN) <4l.s
return TRUE; )tN?: l
} Giy3eva2
return CDialog::PreTranslateMessage(pMsg); r&%gjqt
} C}(<PNT
vDK:v$g
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) r6F{
{ zJnL<Q
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ueWR/
SaveBmp(); xUiWiOihr6
return FALSE; 9:9N)cNvfX
} pW*{Mx
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]^yV`Z8
CMenu pop; >G-8FL
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ?o(ZTlT
CMenu*pMenu=pop.GetSubMenu(0); T@K7DkP@
pMenu->SetDefaultItem(ID_EXITICON); >zPO>.?h7T
CPoint pt; Xk{!' 0
GetCursorPos(&pt); $'A4RVVT
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 86;+r'3p.
if(id==ID_EXITICON) ou<S)_|Iu
DeleteIcon(); A0cM(w{7_
else if(id==ID_EXIT) {f`lSu
OnCancel(); avu*>SB
return FALSE; ONjC(7
} @!z$Sp=
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ewb*?In
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) NqiB8hZ~
AddIcon(); M(n<Iu4^_
return res; 4o1Q7
} (
GFgt_
+Od1)_'\D3
void CCaptureDlg::AddIcon() -kG3k> by_
{ VqcBwJ!?p
NOTIFYICONDATA data; u/z,92mmS
data.cbSize=sizeof(NOTIFYICONDATA); Hnfvo*6d.e
CString tip; R^jlEt\&P
tip.LoadString(IDS_ICONTIP); fC=fJZU7$
data.hIcon=GetIcon(0); 2-B6IPeI
data.hWnd=GetSafeHwnd(); I["F+kt^^
strcpy(data.szTip,tip); 7ZS>1
data.uCallbackMessage=IDM_SHELL; GLo\q:5A
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; NzjMk4t
data.uID=98; Ty`-r5
Shell_NotifyIcon(NIM_ADD,&data); 17e=GL
ShowWindow(SW_HIDE); mZ`1JO9
bTray=TRUE; ^dFhg_GhF
} Q{H17]W
2~vo+ng
void CCaptureDlg::DeleteIcon() @''&nRC1
{ Jb(DJ-&
NOTIFYICONDATA data; /)sDnJ1r
data.cbSize=sizeof(NOTIFYICONDATA); IO}+[%ptc*
data.hWnd=GetSafeHwnd(); ^Ku\l #B
data.uID=98; '
be P
Shell_NotifyIcon(NIM_DELETE,&data); }16&1@8
ShowWindow(SW_SHOW); MinbE13?U
SetForegroundWindow(); #.~ga7Q
ShowWindow(SW_SHOWNORMAL); r %+Bc Y
bTray=FALSE; fr8Xoa%1=
} V@B7P{gH
EY
So=
void CCaptureDlg::OnChange() S
<2}8D
{ yPSVwe|g
RegisterHotkey(); L_E^}^1!
} 5i|s>pD4z1
DNmb[
BOOL CCaptureDlg::RegisterHotkey() Vre=%bGw
{ NPS.6qY
UpdateData(); -&@]M>r@
UCHAR mask=0; Cy`26[E$S
UCHAR key=0; >H$;Z$o*(
if(m_bControl) &j3`
)N
mask|=4; kmIoJH5
if(m_bAlt) BlL|s=dlQV
mask|=2; VF\{ra;
if(m_bShift) YbzM6u2
mask|=1; g`kY]lu
key=Key_Table[m_Key.GetCurSel()]; Z*h43
if(bRegistered){ itw{;j
DeleteHotkey(GetSafeHwnd(),cKey,cMask); p7s@%scp
bRegistered=FALSE; Og=[4?Kpk
} Hc M~
cMask=mask; kQy&I3
cKey=key; JfbKf~g
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |P>|D+I0
return bRegistered; z9 O~W5-U
} Mxo6fn6-46
Z{} n8b*
四、小结 y86))
#VO.%H}i
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。