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:
n1yIQ8 F
\#)|6w- 一、实现方法
I8ZBs0sfF{ EJAk'L+nuH 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:
S F:>dneB il8n
K #pragma data_seg("shareddata")
@4)NxdOE HHOOK hHook =NULL; //钩子句柄
>* Ag0.Az UINT nHookCount =0; //挂接的程序数目
<Zb~tYp static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
eyM<#3\\S static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
/x2-$a:< static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
=&%}p[
3g static int KeyCount =0;
V47z;oMXct static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
\mK;BWg) #pragma data_seg()
aM U0BS" Gm`#0)VC 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。
zWs("L(#s h7r*5E 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:
}4Q~<2 3?%?J^/a BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
asEk3 cKey,UCHAR cMask)
w.7pD {
9w)W| 9 BOOL bAdded=FALSE;
-BV8,1 for(int index=0;index<MAX_KEY;index++){
v3p'*81; if(hCallWnd[index]==0){
z D "n7; hCallWnd[index]=hWnd;
rXh*nC HotKey[index]=cKey;
r`dQ<U, HotKeyMask[index]=cMask;
e4h9rF{Cxn bAdded=TRUE;
[I~&vLTe KeyCount++;
RIm8PV;N break;
{l0[`"EF }
:P'M|U }
Z]~) ->=} return bAdded;
%XC3V7 }
`[)!4Jb //删除热键
_^%DfMP3i\ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
S4ys)!V1V {
T]_]{%z BOOL bRemoved=FALSE;
?)-#\z=6G for(int index=0;index<MAX_KEY;index++){
\&8
61A; if(hCallWnd[index]==hWnd){
yg@8&;bP` if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
{s7
3(B" hCallWnd[index]=NULL;
=)c^ik%F& HotKey[index]=0;
C@o8C%o HotKeyMask[index]=0;
#Sc9&DfX bRemoved=TRUE;
i)!2DXn KeyCount--;
z=FOymvC break;
[_BQ%7DU }
I4"(4u@P }
aPToP.e }
f>CJ1;][{ return bRemoved;
dug^o c1
}
5+DId7d'n m7#v2:OD+ e,K.bgi DLL中的钩子函数如下:
d1qvS@ /R(]hmW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
xYd]|y {
v ^R:XdH BOOL bProcessed=FALSE;
"@^^niSFl if(HC_ACTION==nCode)
Ga]\~31NE {
YB}m1g` if((lParam&0xc0000000)==0xc0000000){// 有键松开
4{lrtNd~K switch(wParam)
w}qLI4 {
cjp~I/U case VK_MENU:
,f@\Fs~n MaskBits&=~ALTBIT;
jct|}U break;
Ur9L8EdC case VK_CONTROL:
8=MNzcA } MaskBits&=~CTRLBIT;
PjG^L
FX break;
H~NK:qRzK case VK_SHIFT:
11iV{ h MaskBits&=~SHIFTBIT;
Y*QoD9<T?; break;
wg UgNwd1 default: //judge the key and send message
s-801JpiJ break;
LrH"d }
L$z(&%Nx for(int index=0;index<MAX_KEY;index++){
A\w"!tNM| if(hCallWnd[index]==NULL)
h!mx/Hx continue;
ucYweXsO3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
5W!#,jz {
&[z<p SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
a=4 `C*) bProcessed=TRUE;
nw-%!}Ot" }
>ZwDcuJ~Lz }
*djVOC }
X> T_Xc else if((lParam&0xc000ffff)==1){ //有键按下
`iNH`:[w switch(wParam)
lyD=n {
[G",Yky case VK_MENU:
3;JF5e\?x MaskBits|=ALTBIT;
.TM.
v5B break;
Y#t9DhzFWo case VK_CONTROL:
X #>:9 MaskBits|=CTRLBIT;
C
%i{{Y&l break;
eg1Mdg\a case VK_SHIFT:
FnPn#Cv>* MaskBits|=SHIFTBIT;
Itz[%Dbiq9 break;
YuUJgt .1 default: //judge the key and send message
wEF"'T break;
7J;\&q' }
/|p\l" for(int index=0;index<MAX_KEY;index++){
5gSe=|we*p if(hCallWnd[index]==NULL)
M%YxhuT0 continue;
eiQ42x@Z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
IP {
$ ~%w21?& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
'2Lx>nByk bProcessed=TRUE;
xOx=Z\ c }
/Un\P }
- -\eYVh[ }
t52KF#+> if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
-EJj j { for(int index=0;index<MAX_KEY;index++){
y(wb?86#W5 if(hCallWnd[index]==NULL)
;efF]") continue;
xpJ=yxO if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
m
al?3*x/ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
I|l5e2j //lParam的意义可看MSDN中WM_KEYDOWN部分
9vP#/ -g }
tlM >=s'T }
TkR#Kzv380 }
cGyR_8:2cv return CallNextHookEx( hHook, nCode, wParam, lParam );
0g2rajS }
\UP=pT@ &
}7+.^ 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:
u2S8DuJ >K<cc#Aa BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
+NJIi@ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
>0UY,2d 9PUobV_^Wo 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:
mT/^F{c ^3ai}Ei3 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
^#t6/fY.# {
CXBFR>" if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
h[;DRD!Z {
'0=mV"#H{ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
n?>|2> SaveBmp();
{oS/Xa return FALSE;
r~G amjS }
h$#PboLd …… //其它处理及默认处理
}5;/!P_A }
I
Z|EPzS <KJ|U0/jGd `oTV)J'~ 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。
CTe!jMZ= }qJ`nN8 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。
e8E' X XmaRg{22 二、编程步骤
icQQLSU5 8>9MeDE 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";
$DaQM'- };R2M 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
C[';B)a ,vo]WIQ\: 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
e=s({V },{sJ0To 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
1\%@oD_zG iL!4r]~H 5、 添加代码,编译运行程序。
vQG v4 LM(r3sonb 三、程序代码
wv`ar>qVL b%KcS&-6 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
KG4zjQf #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
vw$b]MO! #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
nly}ly Q/ #if _MSC_VER > 1000
.mNw^>:cq #pragma once
oVr:ZwkG3 #endif // _MSC_VER > 1000
wwet90_g #ifndef __AFXWIN_H__
gi>W&6 #error include 'stdafx.h' before including this file for PCH
0e07pF/! #endif
(5A8# 7a #include "resource.h" // main symbols
F-F1^$]k class CHookApp : public CWinApp
Fn0|v66 {
6b%IPbb public:
?LJiFG]^m CHookApp();
(w#)|9Cxm // Overrides
4 aE{}jp1 // ClassWizard generated virtual function overrides
&'`ki0Xh; //{{AFX_VIRTUAL(CHookApp)
NHQoP&OG public:
yVQW|D0,j virtual BOOL InitInstance();
q{%~(A5*H virtual int ExitInstance();
5i}g$yjZ< //}}AFX_VIRTUAL
upaQoX/C //{{AFX_MSG(CHookApp)
E#3tkFF0Z[ // NOTE - the ClassWizard will add and remove member functions here.
3}8L!2_p // DO NOT EDIT what you see in these blocks of generated code !
*7=`]w5k1 //}}AFX_MSG
LqO=wK~ DECLARE_MESSAGE_MAP()
c^cr_i };
cml~Oepf LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
k'*vG6! BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
ri-D#F)} BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
]rSg,Q>E BOOL InitHotkey();
YNl".c BOOL UnInit();
(.i wD& #endif
;at1|E* obN8+ j //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
K}MlC}oIt #include "stdafx.h"
|3~]XN- #include "hook.h"
Y
DW^N]G #include <windowsx.h>
%iME[| u& #ifdef _DEBUG
x3(
->?)D #define new DEBUG_NEW
<$pv;]n #undef THIS_FILE
cL!A,+S[_ static char THIS_FILE[] = __FILE__;
ji\&?%(B #endif
Jamt@= #define MAX_KEY 100
,6#%+u}f #define CTRLBIT 0x04
WJ)4rQ$o #define ALTBIT 0x02
.LDp.#d9r1 #define SHIFTBIT 0x01
'r(g5H1}gi #pragma data_seg("shareddata")
..k8HFz>" HHOOK hHook =NULL;
Kv:Rvo UINT nHookCount =0;
vC^{,?@ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
a\~118 ! static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
K<r5jb static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
!Eb|AHa static int KeyCount =0;
? HNuffk static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
$iMLT8U #pragma data_seg()
Qg]A^{.1 HINSTANCE hins;
wW8[t8%43 void VerifyWindow();
,j9? 9Z7R BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
._t1eb`m{ //{{AFX_MSG_MAP(CHookApp)
{-MjsBR // NOTE - the ClassWizard will add and remove mapping macros here.
fFoZ!H // DO NOT EDIT what you see in these blocks of generated code!
19-V;F@; //}}AFX_MSG_MAP
m>F:dI END_MESSAGE_MAP()
C@[U:\ n(|n=P:o CHookApp::CHookApp()
ZR-64G=L, {
UCkV;//. // TODO: add construction code here,
3Agyp89}Q // Place all significant initialization in InitInstance
%C@p4 }
p@Cas KT*>OYI CHookApp theApp;
Vy| 4k2 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Rry]6( {
-rjQ^ze BOOL bProcessed=FALSE;
AlG5n' if(HC_ACTION==nCode)
/u_9uJ"-K( {
l]#=I7 6 if((lParam&0xc0000000)==0xc0000000){// Key up
l!KPgRw switch(wParam)
kj.9\ {
NZ0 ?0* case VK_MENU:
_<DOA:'v MaskBits&=~ALTBIT;
6`G8 UDK>F break;
W'f"kM case VK_CONTROL:
4e;$+!dlV MaskBits&=~CTRLBIT;
{~j/sto-: break;
Ww\ WuaY case VK_SHIFT:
+A^|aQ MaskBits&=~SHIFTBIT;
r b\t0tg break;
Lz p}<B default: //judge the key and send message
tZVs0eVF< break;
,c0LRO }
1Sza%D;3 for(int index=0;index<MAX_KEY;index++){
\x\N?$`ANc if(hCallWnd[index]==NULL)
>T\@j\X4 continue;
]h&1|j1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
O:a=94 {
>dJ~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Cz$q"U bProcessed=TRUE;
Lfdg5D5.P }
,nCvA%B! }
CWRB/WH: }
~b!la else if((lParam&0xc000ffff)==1){ //Key down
tJn"$A^N switch(wParam)
"vQ%`
Q {
(9TSH3f? case VK_MENU:
Z
h9D^I MaskBits|=ALTBIT;
5~T+d1md break;
>Yk|(!v case VK_CONTROL:
?Yf
v^DQ5 MaskBits|=CTRLBIT;
JZ*.;}" break;
;UUgqX# case VK_SHIFT:
/Hq MaskBits|=SHIFTBIT;
~tV7yY|zr break;
7fO<=ei: default: //judge the key and send message
I"x~ 7
break;
A>e-eD xi }
,6pGKCUU:y for(int index=0;index<MAX_KEY;index++)
[^bq?w {
6>;OVX if(hCallWnd[index]==NULL)
:ir3u continue;
YTmHht{j# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\%bJXTK&W {
@Tq-3Um SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Lj#xZ!mQS bProcessed=TRUE;
qO8:|q1%;\ }
r}^1dO }
afna7TlS }
5 r_Z3/% if(!bProcessed){
x4g/ok for(int index=0;index<MAX_KEY;index++){
Ovj^
7r:<s if(hCallWnd[index]==NULL)
Eu"8IM!%- continue;
S
w%6- if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Jc}6kFgO6 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
@1gURx&2_ }
\>}#[?y }
U{bv|vF }
IbL'Z return CallNextHookEx( hHook, nCode, wParam, lParam );
*| W*Mu }
+F8K%.Q_ kaiK1/W0; BOOL InitHotkey()
Skr0WQ {
Yt,MXm\ if(hHook!=NULL){
={
-kQq nHookCount++;
44B D2`nF return TRUE;
XqUQ{^;aI }
dT% eq7= else
BBGub?(dR hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
s]0 J'UN if(hHook!=NULL)
mCk_c nHookCount++;
@ <2y+_e return (hHook!=NULL);
rPyjr(I"_ }
Uf]$I`T# BOOL UnInit()
nTD%i~t~o {
MMC$c=4" if(nHookCount>1){
QA;,/iw ` nHookCount--;
S5, u| H return TRUE;
FE{c{G< }
`w`N5 ! BOOL unhooked = UnhookWindowsHookEx(hHook);
QKx(S=4jQ if(unhooked==TRUE){
o#1Ta7Ro nHookCount=0;
)\VuN-d hHook=NULL;
cn/&QA" }
rw3tU0j return unhooked;
-3~S{) }
vE8'B^h1 UR=s=G| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~*y7%L4B {
\9tJ/~ BOOL bAdded=FALSE;
eq8faC5 for(int index=0;index<MAX_KEY;index++){
$joGda if(hCallWnd[index]==0){
8v8-5N hCallWnd[index]=hWnd;
R@5eHP^ HotKey[index]=cKey;
ZsXw]Wa HotKeyMask[index]=cMask;
s-'~t#h bAdded=TRUE;
N~IAm:G}[ KeyCount++;
`v)'(R7){ break;
Mt`LOdiC_ }
1y6<gptx }
~MC5rOA return bAdded;
IAMa }
s5+;8u9K pO5j-d* BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*S}CiwW>/ {
)m8Gbkj< BOOL bRemoved=FALSE;
ar,v/l>d4N for(int index=0;index<MAX_KEY;index++){
SFtcO if(hCallWnd[index]==hWnd){
qNHI$r' if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
l<4P">M!. hCallWnd[index]=NULL;
"M/) LXn:0 HotKey[index]=0;
oq,nfUA HotKeyMask[index]=0;
ni2 [K` bRemoved=TRUE;
dMsS OP0E KeyCount--;
fJ5mKN break;
.57Fh)Y }
"q= ss:( }
?SO!INJ }
zh=0zJ return bRemoved;
M=ag\1S&ZF }
"$J5cco Yy]TU} PY void VerifyWindow()
|.yS~XFJS {
_[(EsIqc(F for(int i=0;i<MAX_KEY;i++){
Pw]r&)I`y[ if(hCallWnd
!=NULL){ nsXG@C S:
if(!IsWindow(hCallWnd)){ z)v o
hCallWnd=NULL; LWhy5H;Es
HotKey=0; nHDKe)V
HotKeyMask=0; 4VeT]`C^h
KeyCount--; edcz%IOM(
} D*VO;?D
} Nl,iz_2]
} +$VDV4l
} {g`!2"
+]-'{%-zK
BOOL CHookApp::InitInstance() ik)u/r DW
{ L >"O[@
AFX_MANAGE_STATE(AfxGetStaticModuleState()); m{Uh{G$
hins=AfxGetInstanceHandle(); n/*" 2
InitHotkey(); qa@;S,lp
return CWinApp::InitInstance(); 5Uy*^C7M^
} UY({[?Se
<"`f!k#[
int CHookApp::ExitInstance()
Ci4c8
{ J@<f*
VerifyWindow(); 4Hb"yp$
UnInit(); {`
bX*]
return CWinApp::ExitInstance(); >7cj.%
} qc)+T_m
tl* v(ZW
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \h s7>5O^K
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }S')!3[G
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ XY9%aT*
#if _MSC_VER > 1000 $0P16ZlPC
#pragma once D$H&^,?N
#endif // _MSC_VER > 1000 ''q;yKpaz
>Je$WE3
class CCaptureDlg : public CDialog 9eP*N(m<
{ L>WxAeyu1K
// Construction Bfdfw+
public: _7;G$\^&.
BOOL bTray; LX&O"YY
BOOL bRegistered; yil5aUA
BOOL RegisterHotkey(); L7GNcV]c
UCHAR cKey; /u90)x
UCHAR cMask; (vi^ t{k
void DeleteIcon(); lFIaC}
void AddIcon(); =HIKn6C<
UINT nCount; K%/\XnCY
void SaveBmp(); G)b:UJa"
CCaptureDlg(CWnd* pParent = NULL); // standard constructor +8 \?7,FY
// Dialog Data EW4a@
//{{AFX_DATA(CCaptureDlg) IUh9skW5
enum { IDD = IDD_CAPTURE_DIALOG }; UA6
C/
CComboBox m_Key; 9fTl6?x
BOOL m_bControl; be_h
uZ
BOOL m_bAlt; P Gxv4(%
BOOL m_bShift; +jq@!P"}d
CString m_Path; =^*EM<WG)
CString m_Number; ?y>v"1+
//}}AFX_DATA a Iyzt
// ClassWizard generated virtual function overrides 0;=]MEk?
//{{AFX_VIRTUAL(CCaptureDlg) vlDA/( &
public: OtQ]\:p7
virtual BOOL PreTranslateMessage(MSG* pMsg); l<S3<'&
protected: $I#~<bW,
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Rc D5X{qS#
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); fwzyCbks
//}}AFX_VIRTUAL Yh"9,Z&wiR
// Implementation ngd4PN>{4
protected: i
Pl/I
HICON m_hIcon; zp'hA
// Generated message map functions (M{wkQTO
//{{AFX_MSG(CCaptureDlg) |d6/gSiF
virtual BOOL OnInitDialog(); ;O,&MR{;|n
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =)i^E9
afx_msg void OnPaint(); Y Kp@n8A
afx_msg HCURSOR OnQueryDragIcon(); L.K| ]]u
virtual void OnCancel(); mKV31wvK}
afx_msg void OnAbout(); pK_zq
afx_msg void OnBrowse(); rij%l+%@#
afx_msg void OnChange(); ~mah.8G
//}}AFX_MSG F/tRyq`D
DECLARE_MESSAGE_MAP() Wie0r@5E
}; F8tMZ,:
#endif {IBbN05 ;
5RO6YxQ
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ).u>%4=6
#include "stdafx.h" /Hm/%os
#include "Capture.h" sH1ucZ>9Y
#include "CaptureDlg.h" VTDnh*\5
#include <windowsx.h> 3?h!nVI+2J
#pragma comment(lib,"hook.lib") (o{x*';i4
#ifdef _DEBUG
k6@
#define new DEBUG_NEW C deV3
#undef THIS_FILE efHCPj
static char THIS_FILE[] = __FILE__; >k=@YLj
#endif _:Y|a>
#define IDM_SHELL WM_USER+1 !&@t
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #jj(S\WY
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [-e$4^+9
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; m%"=sX7/9
class CAboutDlg : public CDialog ^n4aoj
{ B"*PBJuOA
public: ga;t`5+d
CAboutDlg(); F60m]NUM)c
// Dialog Data KqaEHL
//{{AFX_DATA(CAboutDlg) }PDtx:T-
enum { IDD = IDD_ABOUTBOX }; AtAu$"ue
//}}AFX_DATA 6*>vie
// ClassWizard generated virtual function overrides q
%tq9%
//{{AFX_VIRTUAL(CAboutDlg) i{Q,>Rt
protected: 7Ot&]M
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?G&J_L=@Y
//}}AFX_VIRTUAL Dp^=% F{t
// Implementation J]48th0,
protected: t0:~BYXu
//{{AFX_MSG(CAboutDlg) L/bvM?B^
//}}AFX_MSG SwrzW'%A
DECLARE_MESSAGE_MAP() B*QLKO:)i
}; o(3OChH
LT,zk)5
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) { M[iYFg=
{ B4m34)EOE
//{{AFX_DATA_INIT(CAboutDlg) %,Y^Tp
//}}AFX_DATA_INIT R \y
qM;2
} S!JLy&@
+f_3JL$
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Tn>L?
{ qCm%};yt
CDialog::DoDataExchange(pDX); $\20Vgu<
//{{AFX_DATA_MAP(CAboutDlg) 0PUSCka'6
//}}AFX_DATA_MAP U}<zn+SI#V
} "zFTPL"
R-f('[u
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 5g9K|-
//{{AFX_MSG_MAP(CAboutDlg) ,|UwZ_.
// No message handlers $"Ci{iE
//}}AFX_MSG_MAP oMq:4W,
END_MESSAGE_MAP() ._'.F'd
[e:ccm
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [,z>msEB.
: CDialog(CCaptureDlg::IDD, pParent) l]IQjjJ`
{ W7 T2j+]
//{{AFX_DATA_INIT(CCaptureDlg) *tDxwD7
m_bControl = FALSE; BBl9<ne$
m_bAlt = FALSE; Fj<a;oV
m_bShift = FALSE; 9Z3Y, `R,
m_Path = _T("c:\\"); =}SC .E\
m_Number = _T("0 picture captured."); "!Hm.^1
nCount=0; Q 9JT6
bRegistered=FALSE;
/zir$
bTray=FALSE; ( M3-S5
//}}AFX_DATA_INIT 7#26Smv
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^7$Q"
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); GN|xd+O_
} VK}H;
:+fW#:
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #CB`7}jq
{ ;,B $lgF
CDialog::DoDataExchange(pDX); 0qN?4h)7
//{{AFX_DATA_MAP(CCaptureDlg) a)/ }T
DDX_Control(pDX, IDC_KEY, m_Key); h61BIc@>
DDX_Check(pDX, IDC_CONTROL, m_bControl); U
owbk:
DDX_Check(pDX, IDC_ALT, m_bAlt); GM@0$
DDX_Check(pDX, IDC_SHIFT, m_bShift); ;|Rrtf9
DDX_Text(pDX, IDC_PATH, m_Path); ?SoRi</1
DDX_Text(pDX, IDC_NUMBER, m_Number); hBW,J$B
//}}AFX_DATA_MAP 6bbzgULl
} [Ue"#w
:&O6Y-/B
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @Y&(1Wl
//{{AFX_MSG_MAP(CCaptureDlg) &=-{adm
ON_WM_SYSCOMMAND() G\r>3Ys
ON_WM_PAINT() t@BhosR-
ON_WM_QUERYDRAGICON() c 9zMI
ON_BN_CLICKED(ID_ABOUT, OnAbout) k3e?:t 9
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) rPJbbV",+^
ON_BN_CLICKED(ID_CHANGE, OnChange) nqib`U@"
//}}AFX_MSG_MAP ~_4$|WKl
END_MESSAGE_MAP() `g(r.`t^
Ar[$%
BOOL CCaptureDlg::OnInitDialog() %h=cwT6
{ P # Z+:T
CDialog::OnInitDialog(); cbX<
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); KMV&c
ASSERT(IDM_ABOUTBOX < 0xF000); j"P}Wn
CMenu* pSysMenu = GetSystemMenu(FALSE); 4Mjcx.21
if (pSysMenu != NULL) p+{*&Hm5
{ g; ZVoD
CString strAboutMenu;
m<:g\_<
strAboutMenu.LoadString(IDS_ABOUTBOX); 8lT2qqlr
if (!strAboutMenu.IsEmpty()) e?XQ,
{ Hl*/s
pSysMenu->AppendMenu(MF_SEPARATOR); Z<[f81hE&
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); $4rMYEn08
} /m*+N9)
} Z E},xU%
SetIcon(m_hIcon, TRUE); // Set big icon Q-$EBNz
SetIcon(m_hIcon, FALSE); // Set small icon f`,isy[
m_Key.SetCurSel(0); xz vbjS W
RegisterHotkey(); "]1|%j
CMenu* pMenu=GetSystemMenu(FALSE); 2c8e:Xgv
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); P&8QKX3
j^
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #,\qjY
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); c_.4~>qw
return TRUE; // return TRUE unless you set the focus to a control vsCy?
} 3*[YM7y
$N17GqoC
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) c
UHKE\F
{ B ez 7
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~HyqHxy
{ J~1=?</
CAboutDlg dlgAbout; aECQ(]q
dlgAbout.DoModal(); L[p[m~HjG^
} Eza B}BLQ9
else CB%O8d #
{ ;,jms~ik
CDialog::OnSysCommand(nID, lParam); $@4(Lq1.
} uSn<]OrZo`
} <S` N9a
p#fV|2'
void CCaptureDlg::OnPaint() K6;
s xF
{ ; Uf]-uS
if (IsIconic()) >KnXj7
{ ]tDuCZA
CPaintDC dc(this); // device context for painting ?Y#x`DMh
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); a2`|6M;
// Center icon in client rectangle jM|-(Es.)
int cxIcon = GetSystemMetrics(SM_CXICON); 5oR/Q|^
int cyIcon = GetSystemMetrics(SM_CYICON); hS 7o=G[
CRect rect; -PH!U Hg
GetClientRect(&rect); 2ID]it\5
int x = (rect.Width() - cxIcon + 1) / 2; #MI4 `FZ
int y = (rect.Height() - cyIcon + 1) / 2; IAa}F!6Q1
// Draw the icon !S}4b
dc.DrawIcon(x, y, m_hIcon); *u`[2xmuYf
} o+.LG($+U
else v6_fF5N/
{ 9)]asY
CDialog::OnPaint(); ~xP4}gs1
} j5qrM_Chg
} S2EeC&-AR
ojQjx|Q}
HCURSOR CCaptureDlg::OnQueryDragIcon() >`!Lh`n7_
{ (}NKW
return (HCURSOR) m_hIcon; mk&`dr
} 8 ,<F102(
;Jq 7E
void CCaptureDlg::OnCancel() c2fbqM~
{ %Ut7%obpi
if(bTray) gls %<A{C
DeleteIcon(); '-5Q>d~&h
CDialog::OnCancel(); f-/zR %s{
} .q7|z3@,
WT9k85hqj
void CCaptureDlg::OnAbout() )=c/{
{ VOK0)O>&
CAboutDlg dlg; n%Gk
{h5
dlg.DoModal(); NU?05sF
} 12MWO_'g8
MehMhHY
void CCaptureDlg::OnBrowse() wnoL<p
{ V:vYS
CString str; y&$v@]t1
BROWSEINFO bi; xsIuPL#_
char name[MAX_PATH]; XAf,k&f3
ZeroMemory(&bi,sizeof(BROWSEINFO)); uzpW0(_i3a
bi.hwndOwner=GetSafeHwnd(); QCvz| )
bi.pszDisplayName=name; )cd5iE:FO
bi.lpszTitle="Select folder"; JVgV,4 1
bi.ulFlags=BIF_RETURNONLYFSDIRS; BYBf`F)4
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q-M"+ HO
if(idl==NULL) +:&,Ts/
return; W8R"X~!V
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); _R?:?{r,
str.ReleaseBuffer(); ic_q<Y}
m_Path=str; LmQS;/:
if(str.GetAt(str.GetLength()-1)!='\\') Sx", Zb
m_Path+="\\"; $8"G9r
UpdateData(FALSE); ggn:DE"
} a*gzVE7W#n
@3F 4Lg6H|
void CCaptureDlg::SaveBmp() -l#h^
{ c8cPGm#i
CDC dc; vUU)zZB~
dc.CreateDC("DISPLAY",NULL,NULL,NULL); @L ,hA
v^
CBitmap bm; 4)XZ'~|
int Width=GetSystemMetrics(SM_CXSCREEN); SZ[,(h
int Height=GetSystemMetrics(SM_CYSCREEN); Fs,#d%4 @%
bm.CreateCompatibleBitmap(&dc,Width,Height); ?UGA-^E1
CDC tdc; zJ2dPp~u
tdc.CreateCompatibleDC(&dc); U:n3V
CBitmap*pOld=tdc.SelectObject(&bm); KPcOW#.T
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); utDjN"
tdc.SelectObject(pOld); t kJw}W1@
BITMAP btm; KDODUohC
bm.GetBitmap(&btm); d?uN6JH9
DWORD size=btm.bmWidthBytes*btm.bmHeight; ogrh"
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); PfRe)JuB
BITMAPINFOHEADER bih; "ApVgNB
bih.biBitCount=btm.bmBitsPixel; 8IX,q
bih.biClrImportant=0; 7;T6hKWV[
bih.biClrUsed=0; JXKqQxZ[X
bih.biCompression=0; ta\CZp
bih.biHeight=btm.bmHeight; ~T_4M
bih.biPlanes=1; /d\#|[S
bih.biSize=sizeof(BITMAPINFOHEADER); Jbrjt/OG#I
bih.biSizeImage=size; \<bar ~
bih.biWidth=btm.bmWidth; cn~M:LW23
bih.biXPelsPerMeter=0; )_\ZUem
bih.biYPelsPerMeter=0; im6Rx=}E{
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @FBlF$vG
static int filecount=0; 0+]ol:i
CString name; 5A~lu4-q
name.Format("pict%04d.bmp",filecount++); kDz!v?Z2+B
name=m_Path+name; M+akD
BITMAPFILEHEADER bfh; l^B PTg)X@
bfh.bfReserved1=bfh.bfReserved2=0; C{r Sq
bfh.bfType=((WORD)('M'<< 8)|'B'); ,o3{?o]s
bfh.bfSize=54+size; ;6T>p
bfh.bfOffBits=54; $Z!$E,@c
CFile bf; ve [*t `
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ g=T
!fF=
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <]jKpJ{3N
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #@*;Y(9Ol
bf.WriteHuge(lpData,size); X
\1grM
bf.Close(); EO<{Bj=2
nCount++; ^HYrJr$y
}
yv@td+-"D
GlobalFreePtr(lpData); +~6Nq(kV
if(nCount==1) <u'q._m
m_Number.Format("%d picture captured.",nCount); _h=kjc}[.O
else M+mO4q6
m_Number.Format("%d pictures captured.",nCount); d'4^c,d
UpdateData(FALSE); eiNF?](3O
} _wC4n }J
H1alf_(_
\
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) h]6"~ m
{ -jv%BJJlX
if(pMsg -> message == WM_KEYDOWN) +EtL+Y(U
{ 0gs0[@
if(pMsg -> wParam == VK_ESCAPE) Q/y^ff]=
return TRUE; v7i5R !
if(pMsg -> wParam == VK_RETURN) B-@ ]+W
return TRUE; &K1\"
} ubpVrvu@
return CDialog::PreTranslateMessage(pMsg); k|Hxd^^I
} w _*|u
-t<8)9q(
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O[tOpf@s.
{ ]Tb ?k+a
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Vh.9/$xQ
SaveBmp(); JwkMRO
return FALSE; 7(q EHZEr
} WxN@&g(
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ rW~hFSrV[o
CMenu pop; Jj~c&LxrO
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); yK$.wd2,
CMenu*pMenu=pop.GetSubMenu(0); M7\; Y
pMenu->SetDefaultItem(ID_EXITICON); cVg!"
CPoint pt; `eF&|3!IYQ
GetCursorPos(&pt); 4z_ >CiA
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9{{|P=
if(id==ID_EXITICON) J73B$0FP
DeleteIcon(); [_jd
else if(id==ID_EXIT) 8f^QO:
OnCancel(); (dL;A0L
return FALSE; 63J_u-o
} XzX-Q'i=n0
LRESULT res= CDialog::WindowProc(message, wParam, lParam); O[N}@%HMW
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *bl*R';
AddIcon(); $*%ipD}f
return res; @Gh?|d7bD
} b
V)mO@N~w
"kE$2Kg
void CCaptureDlg::AddIcon() j2UiZLuV
{ Ddf7wszW
NOTIFYICONDATA data; Kc6p||<
data.cbSize=sizeof(NOTIFYICONDATA); :V(+]<
CString tip; pwiXA{
tip.LoadString(IDS_ICONTIP); Hcp)Q76X
data.hIcon=GetIcon(0); }`O_
data.hWnd=GetSafeHwnd(); KRY%B[k
strcpy(data.szTip,tip);
H%!ED1zpA
data.uCallbackMessage=IDM_SHELL; *1}UK9X;
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; qoNVp7uv
data.uID=98; $_j\b4]%
Shell_NotifyIcon(NIM_ADD,&data); dSD7(s!
ShowWindow(SW_HIDE); .pP{;:Avpn
bTray=TRUE;
$\W|{u`
} 0@FZQ$-
uafSz@`
void CCaptureDlg::DeleteIcon() FC' v= *
{ -,M*j|
NOTIFYICONDATA data; `
>w4G|{
data.cbSize=sizeof(NOTIFYICONDATA); 52*9q!
data.hWnd=GetSafeHwnd(); D{Zjo)&tF'
data.uID=98; X1A~#w>
Shell_NotifyIcon(NIM_DELETE,&data); )1PZ#
ShowWindow(SW_SHOW); B74L/h
SetForegroundWindow(); b(hnou S
ShowWindow(SW_SHOWNORMAL); SJYy,F],V"
bTray=FALSE; ZyJdz+L{@V
} aV^wTs#2I
&"D *
void CCaptureDlg::OnChange() x@-bY
{ aoLYw 9
RegisterHotkey(); XZ@;Tyn0,
} lJ+05\pE
P/BWFN1
BOOL CCaptureDlg::RegisterHotkey() EcBJ-j6d
{ _[yBwh
UpdateData(); (+@
Lnz\
UCHAR mask=0; r<Il;?S6
UCHAR key=0; we6kV-L.
if(m_bControl) n=HId:XT
mask|=4; >~;MQDU5*Y
if(m_bAlt) Kq`C5
mask|=2; y^7ol;t
if(m_bShift) {Vc%g a|E
mask|=1; C%s+o0b
key=Key_Table[m_Key.GetCurSel()]; uF xrv
if(bRegistered){
:Hk:Goo2
DeleteHotkey(GetSafeHwnd(),cKey,cMask); .'zXO
bRegistered=FALSE; >s@*S9cj:
} pEc|h*p8
cMask=mask; TM|M#hMS
cKey=key; ?tWcx;h:>
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <A"T_Rk
return bRegistered; 7Z-'@m
} %SV5PO@
A!([k}@=j
四、小结 ;Up'+[Vj'C
~m
,xG
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。