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:
PN n{Rt
;'r} D!8w/ 一、实现方法
)xuvY3BPB? C.
Hr 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:
|Tp>,\:5 #;6YADk2_ #pragma data_seg("shareddata")
.W<yiB}^ HHOOK hHook =NULL; //钩子句柄
zviEk/:zm UINT nHookCount =0; //挂接的程序数目
EnGVp<6R static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
C&m[/PJ~l static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Jiljf2h static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
+Q3i&"QB. static int KeyCount =0;
%P2GQS-N static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
$5`P~Q'U #pragma data_seg()
r-s.i+\ hYMo5 ? 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
V!F#
e k: hX~d1.]Y DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
Ph'P<h:V !>{`o/dZ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
~4\J}Kn cKey,UCHAR cMask)
2WRa@;Tj {
r_f?H@ v BOOL bAdded=FALSE;
3U0>Y%m| , for(int index=0;index<MAX_KEY;index++){
{f\/2k3 if(hCallWnd[index]==0){
;{79d8/= hCallWnd[index]=hWnd;
tB_GEt2M HotKey[index]=cKey;
^b]h4z$ HotKeyMask[index]=cMask;
C$~2FTx bAdded=TRUE;
>'^Tp7\ KeyCount++;
x4PA~R break;
B`xrdtW }
|<l
sv }
K"O+`2$ return bAdded;
OsMU>v }m }
gUs.D_* //删除热键
ao]Dm#HiO BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ua%$r[ {
m?]XNgT BOOL bRemoved=FALSE;
^#T@NN0T for(int index=0;index<MAX_KEY;index++){
?H\K]; if(hCallWnd[index]==hWnd){
\Q"j^4 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
zU;%s<(p hCallWnd[index]=NULL;
%- W3F5NK HotKey[index]=0;
>TT4;p h HotKeyMask[index]=0;
v&p|9C@ bRemoved=TRUE;
XjL)WgQ{i KeyCount--;
dBKL_'@@} break;
=ILE/pC-| }
I'Dc9&2 }
fD<9k }
B zmmE2~* return bRemoved;
A{Jp>15AVg }
diF-`~ X!,2/WT Nr?Z[6O| DLL中的钩子函数如下:
zrqQcnx9(m 7{%_6b" LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
8X,dVX5LT {
1&JPyW BOOL bProcessed=FALSE;
eM";P/XaX if(HC_ACTION==nCode)
ToWiXH)4 {
#)&kF+ if((lParam&0xc0000000)==0xc0000000){// 有键松开
mhZ{}~ switch(wParam)
9?5'>WO {
&eL02:[ case VK_MENU:
;x/do?FbT MaskBits&=~ALTBIT;
^Oy97Y break;
?/Bp8q( case VK_CONTROL:
a:*8SovI MaskBits&=~CTRLBIT;
,%>] break;
@N,(82k case VK_SHIFT:
zq1je2DB MaskBits&=~SHIFTBIT;
"]1 !<M6\i break;
=P}ob eY default: //judge the key and send message
$l05VZ break;
9Z.Xo kg }
]}t6V]`Q for(int index=0;index<MAX_KEY;index++){
$#VE C0 if(hCallWnd[index]==NULL)
.E H&GX continue;
3
q1LIM if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
l`S2bb6uMR {
#aX+?z\4 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
37OU bProcessed=TRUE;
5G$N }
ME.l{?v }
hk6(y?# }
Rb/|ae else if((lParam&0xc000ffff)==1){ //有键按下
XE#a# switch(wParam)
hkpS}*L9o {
8}M-b6RV case VK_MENU:
MnLo{G] MaskBits|=ALTBIT;
*x!j:/S`n break;
B~ ?R 6 case VK_CONTROL:
L`2(u!i J MaskBits|=CTRLBIT;
t.rlC5
k break;
vRhI:E)So# case VK_SHIFT:
SO|!x}GfI MaskBits|=SHIFTBIT;
9q/k,g break;
m| uVmg!* default: //judge the key and send message
HfOaJ'+e< break;
YD9|2S!G }
7v']wA r] for(int index=0;index<MAX_KEY;index++){
Wq2Bo*[* if(hCallWnd[index]==NULL)
~|Nj+A continue;
2%?Kc]JY9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
2S {
7+NBcZuG9 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
@
^q}.u` bProcessed=TRUE;
(^HU| }
~XeWN^l(Ov }
<)$e*HrI }
XQ'$J_hC if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
,Gi%D3lA for(int index=0;index<MAX_KEY;index++){
\? n<UsI if(hCallWnd[index]==NULL)
u5.zckV continue;
)H1\4LeP if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
$RA+StF!] SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
SpO%nZ";g8 //lParam的意义可看MSDN中WM_KEYDOWN部分
01n7ua*XX }
Gh5 3Pne }
1Y:JGon }
?vBMx _0 return CallNextHookEx( hHook, nCode, wParam, lParam );
r9Vt}]$a G }
[-0=ZKH? RRb>]oD 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:
,. HS )<B |jI|},I BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
gJH^f3 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
79z/(T+ t`-
[ 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:
yHo#v:>?p LVaJyI@/> LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
v8"Zru {
m0i,Zw{eM if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
N0pA ,& {
;S9
z@`a. //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
*L&|4|BF2 SaveBmp();
lqcPV) n return FALSE;
W5uC5C*,l }
bXz*g`=; …… //其它处理及默认处理
<CcSChCg }
hRQw] $ghlrV;:ct en"\2+{Cg 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。
}U^iVq* `.g'bZ<v/ 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。
V
7oE\cxr jA? 7>"| 二、编程步骤
vX?C9Fr 2 d"=)=hm! 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";
)GfL?'Z nGM;|6x"8| 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
`i
vE:3k 7/HX!y{WP 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;
v]'\]U^ uovSe4q5q 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;
RGLJaEl ! s$kvLy< 5、 添加代码,编译运行程序。
qL?$u07<9' FMtg7+Q|> 三、程序代码
C1uV7t*\ t=\
ffpA ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Mn 8|
Knh #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
G '%ZPh89 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
uf1s}/M #if _MSC_VER > 1000
~J0r%P #pragma once
t~|`RMn" #endif // _MSC_VER > 1000
?@^gpVK{ #ifndef __AFXWIN_H__
BS2'BS8 #error include 'stdafx.h' before including this file for PCH
6"9(ce
KX #endif
gSHN,8.
` #include "resource.h" // main symbols
,:{+-v( class CHookApp : public CWinApp
',1[rWyc {
_4
YT2k public:
?^ R"a## CHookApp();
/&E]qc*-p // Overrides
Z kBWVZb // ClassWizard generated virtual function overrides
!TN)6e7`
//{{AFX_VIRTUAL(CHookApp)
UJuz public:
ezA&cZ5 virtual BOOL InitInstance();
DFbhy virtual int ExitInstance();
sVH
w\_F$ //}}AFX_VIRTUAL
Ri3*au/Q //{{AFX_MSG(CHookApp)
h^YUu`P // NOTE - the ClassWizard will add and remove member functions here.
yJ>Bc // DO NOT EDIT what you see in these blocks of generated code !
F9>"1 //}}AFX_MSG
4,&f#=Y DECLARE_MESSAGE_MAP()
1*f/Y9 Z };
09=w LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
_U
o3_us BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
l>6p')F! BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
t^=S\1"R\ BOOL InitHotkey();
,uD}1
G<u BOOL UnInit();
xP7mP+D #endif
It]GlxMX (_Th4'(@Y //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
M}`T-"qf #include "stdafx.h"
I0N~>SpZ5 #include "hook.h"
]l"9B'XR #include <windowsx.h>
SB:z[kfz| #ifdef _DEBUG
)K]<\Q[ #define new DEBUG_NEW
od^o9(.W^ #undef THIS_FILE
Z?qc4Cg static char THIS_FILE[] = __FILE__;
lpjby[S #endif
k&:~l@?O #define MAX_KEY 100
:|-^et]a8 #define CTRLBIT 0x04
7HJH9@8V #define ALTBIT 0x02
\0)2 u[7 #define SHIFTBIT 0x01
RLO<5L #pragma data_seg("shareddata")
@cQ
|` HHOOK hHook =NULL;
Ev T"+;9/p UINT nHookCount =0;
($!g= 7 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
;)vs=DK:) static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
zhh6;>P static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
z`YAOhD*h4 static int KeyCount =0;
8mC$p6Okd static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
lI3d
_cU #pragma data_seg()
p::`1 HINSTANCE hins;
/PpZ6ne~[ void VerifyWindow();
>ktekO:H BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
xs?]DJj //{{AFX_MSG_MAP(CHookApp)
)h,}v()qc# // NOTE - the ClassWizard will add and remove mapping macros here.
bRJ]avR
// DO NOT EDIT what you see in these blocks of generated code!
'X~CrgQl //}}AFX_MSG_MAP
6&btAwvOHx END_MESSAGE_MAP()
r@Xh8
r; ;+n25_9 CHookApp::CHookApp()
S-79uo {
@2eH;?uO // TODO: add construction code here,
/S9n!H:MT // Place all significant initialization in InitInstance
p3B_NsXVZ }
UoJMOw[ [9Hrpo]tU: CHookApp theApp;
%htbEKWR LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
<U}25AR {
zX8{( BOOL bProcessed=FALSE;
zomg$@j if(HC_ACTION==nCode)
;(s.G-9S {
~g *`E!2 if((lParam&0xc0000000)==0xc0000000){// Key up
/+m7J"Km switch(wParam)
0{u#{_ {
BQ{'r^u case VK_MENU:
R+Rb[,m MaskBits&=~ALTBIT;
f|,2u5
;z break;
&>Z p}.V case VK_CONTROL:
P9]95.j MaskBits&=~CTRLBIT;
^mZTki4 break;
!H4uc case VK_SHIFT:
CYNpbv MaskBits&=~SHIFTBIT;
?xt${?KP break;
+}C M2>M default: //judge the key and send message
G 'CYvV break;
%sS7o3RW\ }
V6b) for(int index=0;index<MAX_KEY;index++){
Yt;@@xe& if(hCallWnd[index]==NULL)
2vW@d[<J continue;
wQU-r| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r]%.,i7~8 {
30h1)nQ$h} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
TzrU |D? bProcessed=TRUE;
yjucR
Fl }
^Y^5 @x= }
NmV][0(BS }
9|hPl-.
.W else if((lParam&0xc000ffff)==1){ //Key down
]2xoeNF/W{ switch(wParam)
{N0ky=ud {
cWa>rUsF case VK_MENU:
DO?
bJ01 MaskBits|=ALTBIT;
=e]Wt/AQ break;
]K%D$x{+\ case VK_CONTROL:
`pXC= []B2 MaskBits|=CTRLBIT;
~wd~57i@ break;
R(HW0@R@w case VK_SHIFT:
nb|"dK| MaskBits|=SHIFTBIT;
hN_,Vyf break;
D 3}e{J8 default: //judge the key and send message
?Tk4Vt break;
)h(yh50
B }
g$S<_$Iey for(int index=0;index<MAX_KEY;index++)
\4&FW|mx {
Gp))1b'; if(hCallWnd[index]==NULL)
?[q.1O continue;
XJf1LGT5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}UHoa {
B9h> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
S?m4 bProcessed=TRUE;
0 }aw9g }
+luW=j0V }
5$f*fMd; }
^
P=CoLFa if(!bProcessed){
HUY1nb= for(int index=0;index<MAX_KEY;index++){
As*59jkB if(hCallWnd[index]==NULL)
Q_n9}LanP continue;
x20sB if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
>5-]Ur~ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
V %Rz(a+c }
#FV `*G
}
%GDs/9 }
3mM.#2=@> return CallNextHookEx( hHook, nCode, wParam, lParam );
atWAhN }
XWFuAE ]#oqum@Yf1 BOOL InitHotkey()
t2vo;,^euL {
Ic&Jhw;]z if(hHook!=NULL){
#-u?+Nk/ nHookCount++;
@g'SH:} return TRUE;
@y`7csbp }
pxs`g&3yd else
j*;/Cah]k hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
xkebel`% if(hHook!=NULL)
%O3 r>o= nHookCount++;
D*#r
V
P return (hHook!=NULL);
z|>f*Z }
KwuNHK)- BOOL UnInit()
ni x1_Wo; {
zbL6TP@= if(nHookCount>1){
t^1c^RpTb nHookCount--;
Cdd
+I5~ return TRUE;
EJ3R{^ }
afa7'l=^i BOOL unhooked = UnhookWindowsHookEx(hHook);
[Lo}_v& if(unhooked==TRUE){
rhe;j/ /` nHookCount=0;
c\pPwG hHook=NULL;
hgi9%>oUB }
c/E6}OWA return unhooked;
>T<"fEBI }
i&?do{YQ) &4O0}ax*Zm BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Zcn,_b7 {
oXkxd3 BOOL bAdded=FALSE;
*n%J#[e( for(int index=0;index<MAX_KEY;index++){
P9D'L{yS/x if(hCallWnd[index]==0){
Wc)f:]7 hCallWnd[index]=hWnd;
;1 02ddRV HotKey[index]=cKey;
(PN!k0Y HotKeyMask[index]=cMask;
`Z0#IeX= bAdded=TRUE;
_'E,g@ KeyCount++;
#wZ:E,R break;
*u%4]q }
?pv}~> }
B[0XzV]Z return bAdded;
$dLPvN }
\'40u|f v+|N7 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
nUvxO `2 {
^KJIT3J(# BOOL bRemoved=FALSE;
Gm.n@U p for(int index=0;index<MAX_KEY;index++){
ryq95<lF if(hCallWnd[index]==hWnd){
Y?z@)cL if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
+cVnF&@$ hCallWnd[index]=NULL;
8vcV-+x HotKey[index]=0;
{>cO&eiCt HotKeyMask[index]=0;
ivbuS-f=r bRemoved=TRUE;
Whq@>pX8 KeyCount--;
QpPJ99B| break;
^.J
F?2T/ }
ODH@/ }
n(b(H`1n }
##!)}i return bRemoved;
wKCHG/W }
lc=C DT@6Q. void VerifyWindow()
\@4_l?M {
5"5D( for(int i=0;i<MAX_KEY;i++){
( {H5k'' if(hCallWnd
!=NULL){ Rt<8&.m4
if(!IsWindow(hCallWnd)){ (Ia} ]q
hCallWnd=NULL; iG*/m><-
HotKey=0; r c7"sIkV
HotKeyMask=0; qlSc[nEk
KeyCount--; DH_Mll>
} Vet7a_
} "Kz=ZC
} 4cql?W (D
} 2hRaYX,g
EIwTx:{F
BOOL CHookApp::InitInstance() V>j6Juh
{ lV-7bZ
AFX_MANAGE_STATE(AfxGetStaticModuleState()); )dJaF#6j
hins=AfxGetInstanceHandle(); }xHoitOD
InitHotkey(); ~: f9,
return CWinApp::InitInstance(); 9psX"*s
} ` =!&9o
z$E+xZ
int CHookApp::ExitInstance() pI
|;
{ ]}cai1
VerifyWindow(); })|+tZ
UnInit(); qDO4&NO
return CWinApp::ExitInstance(); n}qHt0N
} KD^>Vv#
]+W+8)f1M
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file QH6Lb%]/
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 85l 1
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ n~l )7_G
#if _MSC_VER > 1000 DEaO=p|
#pragma once *lg1iP{]
#endif // _MSC_VER > 1000 Zg|z\VR
|*7uF<ink6
class CCaptureDlg : public CDialog a8-2:8Su
{ t#~r'5va
// Construction nv(Pwb3B
public: N
G1]!Vz5
BOOL bTray; dfe 9)m>
BOOL bRegistered; AU}P`fT!
BOOL RegisterHotkey(); Ay!=Yk^~
UCHAR cKey; d+%1q
UCHAR cMask; hNXPm~OK\
void DeleteIcon(); YZf<S:
void AddIcon(); 1<^"OjQ
UINT nCount; /J8AnA1
void SaveBmp(); 86~HkHliv
CCaptureDlg(CWnd* pParent = NULL); // standard constructor /!UuGm
// Dialog Data phUno2fH
//{{AFX_DATA(CCaptureDlg) 0yXUVKq3
enum { IDD = IDD_CAPTURE_DIALOG }; Zbxd,|<|
CComboBox m_Key; -Xkdu?6Eh
BOOL m_bControl; 28-6(oG
BOOL m_bAlt; @<\f[Znto
BOOL m_bShift; Y2j>lf?8
CString m_Path; %lV&QQa
CString m_Number; %L{ H_;z
//}}AFX_DATA j_\sdH*r
// ClassWizard generated virtual function overrides kqSCKY1
//{{AFX_VIRTUAL(CCaptureDlg) {!xPq%
public: &~U8S^os
virtual BOOL PreTranslateMessage(MSG* pMsg); 4-=> >#
P
protected: \w^iSK-
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >\8Bu#&s4
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); tuK"}HepB
//}}AFX_VIRTUAL Y*3qH]
// Implementation #;a
1=8H
protected: UKQ,]VC
HICON m_hIcon; s'ntf
// Generated message map functions T.!GEUQ
//{{AFX_MSG(CCaptureDlg) FqQm*k_
virtual BOOL OnInitDialog(); SZ~Ti|^
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); '@wYr|s4
afx_msg void OnPaint(); R,/?p
afx_msg HCURSOR OnQueryDragIcon(); kYz)h
virtual void OnCancel(); X\hD4r"
afx_msg void OnAbout(); R*E/E
afx_msg void OnBrowse(); YU[93@mCh
afx_msg void OnChange(); 8[ 1D4d
//}}AFX_MSG 42:\1B#[
DECLARE_MESSAGE_MAP() ?
8S0
}; x';6
#endif 18Vtk"j
>c\'4M8Cz
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file i=reJ(y-
#include "stdafx.h" _+%-WFS|
#include "Capture.h" xg'z_W
#include "CaptureDlg.h" E$34myOVf
#include <windowsx.h> iquB]z'
#pragma comment(lib,"hook.lib") ss% ahs
#ifdef _DEBUG jio1#&
#define new DEBUG_NEW $B*E k>EK
#undef THIS_FILE RqXcL,,9
static char THIS_FILE[] = __FILE__; vd SV6p.d
#endif 4<70mUnt
#define IDM_SHELL WM_USER+1 >;nE.]
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); De4UGX
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); uezqC=v$h
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; mmAikT#k
class CAboutDlg : public CDialog Vur$t^zE
{ ,`G8U/
public: %U)/>Z
CAboutDlg(); $91c9z;f^
// Dialog Data 22`W*e@6h
//{{AFX_DATA(CAboutDlg) gT'c`3Gkz
enum { IDD = IDD_ABOUTBOX }; f3|ttUX
//}}AFX_DATA RhnSQe
// ClassWizard generated virtual function overrides N/TUcG|m\
//{{AFX_VIRTUAL(CAboutDlg) }qG{1Er
protected: &'N{v@Oi)
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,4jkTQ*@2
//}}AFX_VIRTUAL wZh&w<l'
// Implementation @xmO\
protected: ['sj'3cW-
//{{AFX_MSG(CAboutDlg) qWHH%
L;
//}}AFX_MSG Va\dMv-b
DECLARE_MESSAGE_MAP() qWGnIPk
}; n(/(F`
R(kr@hM
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5 1@V""m
{ |J'@-*5?[8
//{{AFX_DATA_INIT(CAboutDlg) 0V"r$7(}
//}}AFX_DATA_INIT :qc@S&v@]
} U GQ{QH
{%9)l,
void CAboutDlg::DoDataExchange(CDataExchange* pDX) vmvk
{ m7zen530
CDialog::DoDataExchange(pDX); rF2`4j&!
//{{AFX_DATA_MAP(CAboutDlg) Ps+0qqT*
//}}AFX_DATA_MAP k8F<j)"
} Tw)nFr8oF]
`Ff3H$_*
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) KIC5U50J
//{{AFX_MSG_MAP(CAboutDlg) ixw3Z D(>+
// No message handlers &xgMqv2/
//}}AFX_MSG_MAP s-}|_g.Pt
END_MESSAGE_MAP() s&iM.[k
~jH@3\
?-
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) tU>wRw=d
: CDialog(CCaptureDlg::IDD, pParent) G6w&C^J*8>
{ A9Q!V01_
//{{AFX_DATA_INIT(CCaptureDlg) F.HD;C-;(
m_bControl = FALSE; V'#dY~E-P
m_bAlt = FALSE; _~&6Kb^*
m_bShift = FALSE; <MB]W`5
m_Path = _T("c:\\"); 9s6@AJf
m_Number = _T("0 picture captured."); II3)Cz}xRG
nCount=0; $/Gvz)M
bRegistered=FALSE; BDNn~aU#m
bTray=FALSE; P_B#
//}}AFX_DATA_INIT -/ ;y*mP
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 zu5'Ex`gQa
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); h
+.8Rl
} Sav]Kxq{
M")J buI
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @ H=
d8$
{ AMG}'P:
CDialog::DoDataExchange(pDX); oN)l/"%C7/
//{{AFX_DATA_MAP(CCaptureDlg) =SB#rCH
DDX_Control(pDX, IDC_KEY, m_Key); {^i7 3}@O
DDX_Check(pDX, IDC_CONTROL, m_bControl); S 3Tp__
DDX_Check(pDX, IDC_ALT, m_bAlt); 9 JBPE
DDX_Check(pDX, IDC_SHIFT, m_bShift); hF s:9
DDX_Text(pDX, IDC_PATH, m_Path); 01g=Cg
DDX_Text(pDX, IDC_NUMBER, m_Number); >N@tInE
//}}AFX_DATA_MAP {UX?z?0T
} i6?,2\K
1 "?KQU
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) x9Fga _
//{{AFX_MSG_MAP(CCaptureDlg) gS _)(
ON_WM_SYSCOMMAND() vp?87h
ON_WM_PAINT() t
9&xk?%{
ON_WM_QUERYDRAGICON() ((Ak/ qz
ON_BN_CLICKED(ID_ABOUT, OnAbout) ;&q}G1
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) NeAkJG=<
ON_BN_CLICKED(ID_CHANGE, OnChange) svCD&~|K#
//}}AFX_MSG_MAP 9h>nP8
END_MESSAGE_MAP() XAW$"^p
%'a%ynFs
BOOL CCaptureDlg::OnInitDialog() 1uZ[Ewl]
{ dqnH7okZ
CDialog::OnInitDialog(); y >r7(qg
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); n$
$^(-g@)
ASSERT(IDM_ABOUTBOX < 0xF000); lqn7$
CMenu* pSysMenu = GetSystemMenu(FALSE); B8UtD
if (pSysMenu != NULL) 5ppOG_
{ 'DO^ ($N
CString strAboutMenu; 7yD=~l\Bbs
strAboutMenu.LoadString(IDS_ABOUTBOX); 7cW9@xPe
if (!strAboutMenu.IsEmpty()) X,n4_=f
{ cjAKc|N J
pSysMenu->AppendMenu(MF_SEPARATOR); <`k\kZM
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Ni#!C:q
} {e\Pd!D?|
} lPx4=O
SetIcon(m_hIcon, TRUE); // Set big icon /ts=DxCC;
SetIcon(m_hIcon, FALSE); // Set small icon 11[[H kX@
m_Key.SetCurSel(0); 7zXFQ|TP
RegisterHotkey(); v#0F1a?]D
CMenu* pMenu=GetSystemMenu(FALSE); 8^\}\@
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {STOWuY
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); h[#Lg3
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); i]J*lM7'
return TRUE; // return TRUE unless you set the focus to a control g}"`@H(9r3
} xI}o8G KQq
dU1w)Y
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) n8UQIa4&=
{ $R(?@B(
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5b45u 6
{ x|U~?
CAboutDlg dlgAbout; F-[zuYGp
dlgAbout.DoModal(); 7[h_"@_A7
} XK??5'&{
else &[:MTK?x!
{ ;Pf
|\q
CDialog::OnSysCommand(nID, lParam); sd9$4k"
} i!+D
,O
} BLZ#vJR
6r!
Y ~\@
void CCaptureDlg::OnPaint() 4
AZ~<e\
{ TP o%zZo
if (IsIconic()) :xJ]#
t..
{ qX{"R.d
CPaintDC dc(this); // device context for painting oNQ;9&Z,^2
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); wgfA\7Z
// Center icon in client rectangle .] mYpz
int cxIcon = GetSystemMetrics(SM_CXICON); 9qN4f8R
int cyIcon = GetSystemMetrics(SM_CYICON); ~,+n_KST;
CRect rect; j[l6&eX
GetClientRect(&rect); xFxl9oM."
int x = (rect.Width() - cxIcon + 1) / 2; WA}<Zme3[
int y = (rect.Height() - cyIcon + 1) / 2; _J(n~"eR
// Draw the icon xxkUu6x#
dc.DrawIcon(x, y, m_hIcon); /WlK*8C
} Atsi}zTR\
else jXA!9_L7
{ W9n0Jv
CDialog::OnPaint(); gw~%jD-2
} i{[=N9U5o
} DTmv2X
)*#Pp )Q
HCURSOR CCaptureDlg::OnQueryDragIcon() H,,-;tN?
{ M2HO!btf
return (HCURSOR) m_hIcon; ALvj)I`Al
}
bj23S&
\Zc$X^}vN
void CCaptureDlg::OnCancel() Q|QVm,m
{ ?#;
oqH<
if(bTray) Rs_0xh
DeleteIcon(); 8 2qf7`
CDialog::OnCancel(); 6BM[RL?T
} 9ZvBsG)
MV
+R $
void CCaptureDlg::OnAbout() "hwg";Z$n
{ -c-af%xD
CAboutDlg dlg; Y<|!)JLB2
dlg.DoModal(); !`5[(lm
} #vrxhMo
qu]ch&"?U
void CCaptureDlg::OnBrowse() b`"E(S /
{ I)#=#eI*:
CString str; iEx.BQ+
BROWSEINFO bi; &:}e`u@5|
char name[MAX_PATH]; L9tjHC]
ZeroMemory(&bi,sizeof(BROWSEINFO)); }OY]mAv-B
bi.hwndOwner=GetSafeHwnd(); H.-jBFt}
bi.pszDisplayName=name; dxqVZksg(9
bi.lpszTitle="Select folder"; @X`~r8&
bi.ulFlags=BIF_RETURNONLYFSDIRS; b3(pRg[Fp
LPITEMIDLIST idl=SHBrowseForFolder(&bi); BiGB<Jr
if(idl==NULL) p@epl|IZp
return; EvZ;i^.8LS
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); *9:oTN
str.ReleaseBuffer(); LhM{LUi
m_Path=str; l`lo5:w
if(str.GetAt(str.GetLength()-1)!='\\') KrOoxrDcp
m_Path+="\\"; dw
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UpdateData(FALSE); f[,9WkC
} vZV+24YWb
.G}E
void CCaptureDlg::SaveBmp() D|8vS8p
{ m-f"EFmP
CDC dc; 5dffFe
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]zp5 6U|xa
CBitmap bm; iku8T*&uc
int Width=GetSystemMetrics(SM_CXSCREEN); B$~oZ'4v
int Height=GetSystemMetrics(SM_CYSCREEN); whb|N2
bm.CreateCompatibleBitmap(&dc,Width,Height); DLMG<4Cd~
CDC tdc; e$F]t*)Xa
tdc.CreateCompatibleDC(&dc); z;1y7W!v
CBitmap*pOld=tdc.SelectObject(&bm); =Y`P}vI]w%
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); <S~_|Y*v
tdc.SelectObject(pOld); IOA"O9;
BITMAP btm; p.KX[I
bm.GetBitmap(&btm); 9hAS#|vK
DWORD size=btm.bmWidthBytes*btm.bmHeight; wX}N===
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;\`~M
BITMAPINFOHEADER bih; Enee\!@v
bih.biBitCount=btm.bmBitsPixel; 1-Fg_G}|6
bih.biClrImportant=0; Ov3W;jD
bih.biClrUsed=0; 9k\`3SE
bih.biCompression=0; =! v.VF\;
bih.biHeight=btm.bmHeight; ;t47cUm6j
bih.biPlanes=1; jvx9b([<sG
bih.biSize=sizeof(BITMAPINFOHEADER); (H *-b4]/
bih.biSizeImage=size; "8K>Yu17
bih.biWidth=btm.bmWidth; R'a%_sACj>
bih.biXPelsPerMeter=0; wu?ahNb.`Y
bih.biYPelsPerMeter=0; AH`n
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @rs(`4QEh
static int filecount=0; xt]Z{:.
CString name; SQ#6~zxl
name.Format("pict%04d.bmp",filecount++); d
q=>-^o
name=m_Path+name; l@`D;m
BITMAPFILEHEADER bfh; MWf ]U
bfh.bfReserved1=bfh.bfReserved2=0; V~LZ%NZ8
bfh.bfType=((WORD)('M'<< 8)|'B'); YArNJ5z=
bfh.bfSize=54+size; ||v=in
bfh.bfOffBits=54; 2mL1BG=Yk
CFile bf; s
vn[c*
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ w?CbATQ
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0P`wh=")
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `mPmEV<
bf.WriteHuge(lpData,size); ^_4TDC~h
bf.Close(); a2W}Wb+
nCount++; h"VQFqQy
} Tk s;,C
GlobalFreePtr(lpData); {9TWPB/>
if(nCount==1) "cjZ6^Hum
m_Number.Format("%d picture captured.",nCount); Mr'}IX5
else M ,V+bt
m_Number.Format("%d pictures captured.",nCount); E/cA6*E[.<
UpdateData(FALSE); 70_T;K6
} CCKg,v
WtI1h `Fo
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) H3{x;{.b
{ :QgC Zq
if(pMsg -> message == WM_KEYDOWN) 2&91C[da0
{ lJ]r%YlF
if(pMsg -> wParam == VK_ESCAPE) /=Ug}%.
return TRUE; zi:F/TlUC
if(pMsg -> wParam == VK_RETURN) bb;fV
return TRUE; !8&,GT
} a?' 3
return CDialog::PreTranslateMessage(pMsg); ;ak3@Uee
} xVoWGz7
O$x-&pW`g
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8o8FL~&]
{ m^zx&
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ m}.ru)^p
SaveBmp(); {frEVHw
return FALSE; WO*yJ`9]
} I Vy,A7f
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Bc}<B:q%b
CMenu pop; `7jm
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Fk D
CMenu*pMenu=pop.GetSubMenu(0); X:-X3mV9{
pMenu->SetDefaultItem(ID_EXITICON); :NU-C!eT
CPoint pt; s#w+^Mw$
GetCursorPos(&pt); Qo
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); rh2pVDS
if(id==ID_EXITICON) FW7+!A&F
DeleteIcon(); Ff>Y<7CQ
v
else if(id==ID_EXIT) pH#&B_S6z=
OnCancel(); b
qB[vPsI
return FALSE; :b>Z|7g ?
} K-wjQ|*1
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1=#r$H
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) qGkrG38K
AddIcon(); ^7q=E@[e
return res; $gDp-7
} n ! qm
$N;!. 5lX3
void CCaptureDlg::AddIcon() Lhl)p P17
{ a#H=dIj
NOTIFYICONDATA data; Ary$,3X2
data.cbSize=sizeof(NOTIFYICONDATA); oT
8
CString tip; Td[w<m+p<P
tip.LoadString(IDS_ICONTIP); Ga f/0/|
data.hIcon=GetIcon(0); 0 w\X
data.hWnd=GetSafeHwnd(); DjOFfD\MF
strcpy(data.szTip,tip); B0=:A
data.uCallbackMessage=IDM_SHELL; mDE{s",q/
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9BI5qHEp
data.uID=98; 4 E3@O
Shell_NotifyIcon(NIM_ADD,&data); ,- ]2s_
ShowWindow(SW_HIDE); cYx=8~-
bTray=TRUE; )$q<"t\#P#
} 1E$Z]5C9
xy mK|
void CCaptureDlg::DeleteIcon() qU8UKI P
{ VR?7{3
NOTIFYICONDATA data; <6<uO\B\
data.cbSize=sizeof(NOTIFYICONDATA); w:FH2*
data.hWnd=GetSafeHwnd(); jbIWdHZ/US
data.uID=98; Z.6`O1OY}?
Shell_NotifyIcon(NIM_DELETE,&data); wdBytH6r.
ShowWindow(SW_SHOW); ?3SlvKI}H`
SetForegroundWindow(); $ajw]2kx
ShowWindow(SW_SHOWNORMAL); B0p>' O2
bTray=FALSE; y NV$IN%
} ?Z4&j'z<
};9dd3X
void CCaptureDlg::OnChange() %W"\
{ PkDL\Nqe
RegisterHotkey(); x|0Q\<mEe
} Y@eHp-[
H[@}ri<
BOOL CCaptureDlg::RegisterHotkey() R'dF<&Kj|
{ 3JW9G04.
UpdateData(); fH`1dU
UCHAR mask=0; C*Ws6s>+z
UCHAR key=0; BT>*xZLpS
if(m_bControl) Aog3d\1$
mask|=4; 0nx
<f>n
if(m_bAlt) x(}t r27o
mask|=2; 8g>jz
8
if(m_bShift) ~$r^Ur!E\
mask|=1; W<!q>8Xn?
key=Key_Table[m_Key.GetCurSel()]; BCUw"R#
if(bRegistered){ gp-wlu4
DeleteHotkey(GetSafeHwnd(),cKey,cMask); *XH?|SV
bRegistered=FALSE; Byldt
} ccD+o$7LT
cMask=mask; Xz]}cRQ[
cKey=key; aS~k.^N
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "vLqYc4$
return bRegistered; w2{k0MW
} /2'\ya4B
eg(xN/D
四、小结 {h9#JMIA
);))kYr
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。