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:
egbb1+tY
{RH*8?7 一、实现方法
v/x*]c!"` zaBG= 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:
^ISQ{M#_ _Po#ZGm~ #pragma data_seg("shareddata")
!bieo'c HHOOK hHook =NULL; //钩子句柄
8| Sba<d UINT nHookCount =0; //挂接的程序数目
$CM4&{B"i static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
[C2kK *JZ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
}pt-q[s> static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
J7_8$B-j7 static int KeyCount =0;
c9|I4=_K static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
zQn//7#-G #pragma data_seg()
O8iu+}]/6 XA?WUR[e 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。
`k!UjO72 sC9-+} 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:
We|-5 [1mIdwS BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
bIq-1
Y( cKey,UCHAR cMask)
<jg8y'm@0 {
z}D#WWSxf BOOL bAdded=FALSE;
@|Z*f\ for(int index=0;index<MAX_KEY;index++){
yTP[,bM if(hCallWnd[index]==0){
D)h["z|F hCallWnd[index]=hWnd;
8dlInms HotKey[index]=cKey;
aK!xRnY HotKeyMask[index]=cMask;
>d'EInSF bAdded=TRUE;
qq/_yt KeyCount++;
jzQ9zy_ break;
^971<B(v }
KzIt }
UQSX<6" return bAdded;
$,g 3*A }
n|J.)E. //删除热键
t
]71 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
C CLfvex {
eK\|SQb BOOL bRemoved=FALSE;
#DrZ`Aq for(int index=0;index<MAX_KEY;index++){
WT I 'O if(hCallWnd[index]==hWnd){
.HQVj 'g if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
38<~R hCallWnd[index]=NULL;
t]gq+ c Lo HotKey[index]=0;
G[y&`Qc)G HotKeyMask[index]=0;
]<Z&=0i# 9 bRemoved=TRUE;
-aC!0O y` KeyCount--;
t7sUtmq
break;
DS.39NY }
:~-)Sm+^ }
VyRW ' }
vI4%d, return bRemoved;
-,[~~ }
M^Q&A R'F @"jmI&hYn dCW0^k DLL中的钩子函数如下:
:v|r= #OI 6JUav."`~ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[]^PJ {
V+P8P7y37B BOOL bProcessed=FALSE;
i0i.sizu if(HC_ACTION==nCode)
+#^sy> {
#rqyy0k0'h if((lParam&0xc0000000)==0xc0000000){// 有键松开
07~pf} switch(wParam)
l2z`<2mp {
i!s~kk case VK_MENU:
41P4?"O MaskBits&=~ALTBIT;
i528e{& break;
C}t+t case VK_CONTROL:
1\M"`L/ MaskBits&=~CTRLBIT;
3s88#_eT break;
cq+nWHqF{J case VK_SHIFT:
9_g>BI;"8 MaskBits&=~SHIFTBIT;
%4QoF break;
H>gWxJ
5 default: //judge the key and send message
@n5;|`)\ break;
}rFsU\]:q }
KZ367&>b7 for(int index=0;index<MAX_KEY;index++){
ph}wnIW] if(hCallWnd[index]==NULL)
D2hAlV)i( continue;
<k!mdj) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
:)^#
xE( {
nR=2eBNf SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
?qq!%4mTB bProcessed=TRUE;
EF*oPn0| }
FFD*e-i }
$9j>VGf= }
]4LT# else if((lParam&0xc000ffff)==1){ //有键按下
%XDip]+rb switch(wParam)
#`YxoY ` {
/ h2*$ case VK_MENU:
F3H:I"4 MaskBits|=ALTBIT;
OuYE-x2]x" break;
c_D,MW\IC case VK_CONTROL:
Vsm%h^]d MaskBits|=CTRLBIT;
h&:Q$*A> break;
: .FfE case VK_SHIFT:
@xW"rX#7f MaskBits|=SHIFTBIT;
.:|#9%5 break;
D>"{H7mY default: //judge the key and send message
F$sF
'cw break;
Wf+Cc?/4 }
Jnu}{^~ for(int index=0;index<MAX_KEY;index++){
h~=\/vF if(hCallWnd[index]==NULL)
+r#=n7t continue;
J1u@A$4l? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[][:/~q! {
%0y3 /W SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
F]dd># bProcessed=TRUE;
qMW%$L\HA }
U{za m }
]y)R C-N }
tc49Ty9$[ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
xTksF?u) for(int index=0;index<MAX_KEY;index++){
M~g~LhsF if(hCallWnd[index]==NULL)
zDGg\cPj9 continue;
kVG6\<c] if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
9 FFfRIVY SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
F~d7;x=g //lParam的意义可看MSDN中WM_KEYDOWN部分
2A18hP`^ }
LK-K_!F }
/Mi-lh^j- }
9B?t3: return CallNextHookEx( hHook, nCode, wParam, lParam );
sgb+@&}9n }
IW] 841 ~gLEh tW 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:
w'zO(6 ` Fh!!T%5>C BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
8ZDqqz^C0 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
0u&?Zy9& uYFcq 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:
T0]%(F/8 D=I5[t0c4 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
gQ@Pw4bA {
65`'Upu if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
.KwuhmR {
a@a1TpLQ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
%\zCOfN SaveBmp();
l_q>(FoqA return FALSE;
[:hy }
L_zmU_zD …… //其它处理及默认处理
[Yahxw} }
(82\&dfy KiRt' @)juP- o% 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。
2Ws/0c dc@wf;o 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。
s2' :&5( 4f @\f7\ 二、编程步骤
L8-[:1 O^="T^J 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";
y\f 8Ird x#e\H
F 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
JjTzq2'% p7=^m>Z6 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;
:7PSZc:xE 4U y>#IL 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
4[V6so 0 hb8@br 5、 添加代码,编译运行程序。
*,*:6^t d# ?*62 三、程序代码
#O974f8 WZ
V*J& ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Ckl]fy@D} #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
s8I77._s #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
&7kSLat+9{ #if _MSC_VER > 1000
+7vh_ _ #pragma once
xg1r 3 #endif // _MSC_VER > 1000
w.F3o4YP #ifndef __AFXWIN_H__
:IKp7BS #error include 'stdafx.h' before including this file for PCH
?(L?X&)v #endif
x)sDf!d4bi #include "resource.h" // main symbols
=
Ow&UI class CHookApp : public CWinApp
]8cX#N,M {
;8xn"G0}a public:
UY& W] CHookApp();
vlKKPS // Overrides
X1~A "sW[ // ClassWizard generated virtual function overrides
yaGVY*M0 //{{AFX_VIRTUAL(CHookApp)
z+B public:
R =c virtual BOOL InitInstance();
G u I sM virtual int ExitInstance();
H.S|njn:r //}}AFX_VIRTUAL
]vyF&`phb //{{AFX_MSG(CHookApp)
"@|V.d@ // NOTE - the ClassWizard will add and remove member functions here.
k
<Sa< // DO NOT EDIT what you see in these blocks of generated code !
:[?o7%" //}}AFX_MSG
'GO..m"G DECLARE_MESSAGE_MAP()
,O`*AzjS5Q };
QO^X7A"?X LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
tKViM@T BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
;+Kewi;< BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
BTQC1;;N BOOL InitHotkey();
zi 14]FWo BOOL UnInit();
uUB%I 8 #endif
83(P_Y: t`3T_t Y //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
qO'5*d;!d #include "stdafx.h"
~$obcW1 #include "hook.h"
-Af`AX #include <windowsx.h>
] ]-0RJ=S? #ifdef _DEBUG
_C#()# #define new DEBUG_NEW
H~K2`Cr)4 #undef THIS_FILE
<NsT[r~C static char THIS_FILE[] = __FILE__;
Nfvg[c #endif
6$;)CO!h #define MAX_KEY 100
7i8qB462 #define CTRLBIT 0x04
HpC4$JMm #define ALTBIT 0x02
+FK<j;}C7 #define SHIFTBIT 0x01
} R6h #pragma data_seg("shareddata")
j_<n~ri- HHOOK hHook =NULL;
D[y|y3F UINT nHookCount =0;
3&2q\]Y, static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
P@?'@.e static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
} dlNMW static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
?uBC{KQ}Y static int KeyCount =0;
/Bu5kBC static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
d> AmM!J #pragma data_seg()
iR =aYT~ HINSTANCE hins;
~ZC=!|Q# void VerifyWindow();
N4NH)x BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
<b40\Z{+ //{{AFX_MSG_MAP(CHookApp)
VqU:`?#"a // NOTE - the ClassWizard will add and remove mapping macros here.
fJV VW // DO NOT EDIT what you see in these blocks of generated code!
u^[v{hv'H //}}AFX_MSG_MAP
a'~y'6 END_MESSAGE_MAP()
:!\./z8v 'gH#\he[Dh CHookApp::CHookApp()
i kiy>W8 {
$KFWV2P // TODO: add construction code here,
uV:;y}T^Z // Place all significant initialization in InitInstance
p7tC~]r:L }
D:,<9 %A j!H?dnE|| CHookApp theApp;
0g)mf6}o LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
g?M69~G$:x {
r!uAofIi_ BOOL bProcessed=FALSE;
&|;!St]!M if(HC_ACTION==nCode)
GTe9@d {
@/iLC6QF if((lParam&0xc0000000)==0xc0000000){// Key up
S5!2%-;<k switch(wParam)
)G gx {
gf>5xf{M case VK_MENU:
;zG|llX MaskBits&=~ALTBIT;
R6Lr]H break;
> `M\xt case VK_CONTROL:
S>Y?QQ3#wp MaskBits&=~CTRLBIT;
Ymvd=F break;
1OL~)X3 case VK_SHIFT:
VG^-aR_F MaskBits&=~SHIFTBIT;
wH<* break;
1vb0G;a;| default: //judge the key and send message
>o7k%T|l$ break;
95&HsgdxJ }
)9->]U@ for(int index=0;index<MAX_KEY;index++){
de=T7,G# if(hCallWnd[index]==NULL)
LlqhZetS continue;
.&dcJh*O+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
fok#D>q {
K-5)Y+| > SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
&x #5-O' bProcessed=TRUE;
>?KyPp }
KS_d5NvYl }
Q0-~&e_' }
w6 .HvH-@? else if((lParam&0xc000ffff)==1){ //Key down
`rV,<
switch(wParam)
| <$O5b' {
yhmW-#+^e case VK_MENU:
'r
CR8>k MaskBits|=ALTBIT;
E~Nr4vq break;
g!uhy} case VK_CONTROL:
+`FY MaskBits|=CTRLBIT;
z_TK
(;j break;
yfrgYA case VK_SHIFT:
8%Lg)hvl MaskBits|=SHIFTBIT;
7Cjrh"al" break;
J)]W[Nk default: //judge the key and send message
@<L.#gtP break;
CqV
\:50g }
P/5r(l5 for(int index=0;index<MAX_KEY;index++)
E~ kmU{D {
G
y2XjO8b if(hCallWnd[index]==NULL)
|99eDgK, continue;
M\3!elp2z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
G1|:b-C {
8iRQPV-"_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
fkM4u<R^ bProcessed=TRUE;
Tj:F Qnx }
vvC GzOv }
JAK*HA }
zZ63
P if(!bProcessed){
T5)?6i-N for(int index=0;index<MAX_KEY;index++){
dWA7U6c< if(hCallWnd[index]==NULL)
3@PVUJ0B| continue;
Y/gCtSF if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
_U %B1s3y SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
UpbzH(?# }
QB3AL;7 }
aUV>O`|_ }
joq
;N]S return CallNextHookEx( hHook, nCode, wParam, lParam );
n$QFj' }
,bJx|
K &*iiQ3 BOOL InitHotkey()
tp7fmn* {
Uka4iya if(hHook!=NULL){
Qi M>59[ nHookCount++;
81&!!qhfS return TRUE;
i2DR}%U }
)? xg=o/? else
I
g`#U~ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
-zt\weqA if(hHook!=NULL)
|d$aISO` nHookCount++;
#,sJd ^uI return (hHook!=NULL);
:L,]<n }
We|*s2! BOOL UnInit()
@Hzsud {
'CvZiW[_r if(nHookCount>1){
{ib`mC^ nHookCount--;
_B2t|uQ return TRUE;
Wo&i)S<i0F }
%zGPF BOOL unhooked = UnhookWindowsHookEx(hHook);
Rp#SqRy` if(unhooked==TRUE){
]?2AFkF nHookCount=0;
B(~D*H2T[ hHook=NULL;
KE_Ze\P }
pR$c<p return unhooked;
R)v`ZF,/b }
&nq[Vy0kO4 "F^EfpcJ{9 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
S$Wd}2> {
.s+e
hZ BOOL bAdded=FALSE;
K vgZx(. for(int index=0;index<MAX_KEY;index++){
Aq-v3$XL if(hCallWnd[index]==0){
DE[y&]/C{ hCallWnd[index]=hWnd;
wBf
bpoE7 HotKey[index]=cKey;
Tb[GZ,/%; HotKeyMask[index]=cMask;
U[ed#9l> bAdded=TRUE;
ZISR]xay KeyCount++;
; -3M break;
W $y?~2 }
"H({kmR }
x-"7{@lz
return bAdded;
-`( :L[ }
nv={.H JO$0Z BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
X@s s d {
Y\rKw!u_! BOOL bRemoved=FALSE;
_T1e##Sq, for(int index=0;index<MAX_KEY;index++){
y
Le5, if(hCallWnd[index]==hWnd){
:sf;Fq if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
ixp %aRRP hCallWnd[index]=NULL;
;J4_8N- HotKey[index]=0;
~=71){4A HotKeyMask[index]=0;
fRbVc bRemoved=TRUE;
TZ/u"' ZS KeyCount--;
"/q6E break;
wL{Qni3A }
4B|f}7%\ }
pG
(8VteH }
vO\CPb
%/ return bRemoved;
FIuKX"XR }
[=iq4F'7 f"[C3o2P void VerifyWindow()
(Fu9lW}n {
35ng_,t$ for(int i=0;i<MAX_KEY;i++){
</fzBaTo if(hCallWnd
!=NULL){ V3UEuA
if(!IsWindow(hCallWnd)){ n4ISHxM
hCallWnd=NULL; m~}nM |m%
HotKey=0; }5A?WH_
HotKeyMask=0; {5,CW
KeyCount--; 5EU3BVu&u
} B%,0zb+-L
} AojX)_"z
} 4|~o<t8
} (|WqOwmoUt
8.vD]hO
BOOL CHookApp::InitInstance() C 9DRVkjj
{ CkOd>Kn
AFX_MANAGE_STATE(AfxGetStaticModuleState()); f#!Ljjf$;
hins=AfxGetInstanceHandle(); 8r~4iVwg
InitHotkey(); rtPQ:CaA)?
return CWinApp::InitInstance(); B${Q Y)t
} RSp=If+4
M; V2O;
int CHookApp::ExitInstance() m49)c K?
{ 7{p,<Uz<"U
VerifyWindow(); + 505
UnInit(); G-Y8<mEh
return CWinApp::ExitInstance(); Baq&>]
} s01n[jQ
x]F:~(P
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file N^O.P
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) NL1Ajms`
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ]":PO4M$*
#if _MSC_VER > 1000 ,Q^.SHP8
#pragma once &L_(yJ~-
#endif // _MSC_VER > 1000 gg<lWeS/3
w'}b 8m(L
class CCaptureDlg : public CDialog fi1tF/`
{ $[H3O(B0*
// Construction D&.+Dx^G
public: LnLuWr<;}
BOOL bTray; o_{-X 1w
BOOL bRegistered; ]@_*O$
BOOL RegisterHotkey(); Qv#]T,
UCHAR cKey; BYRf MtT@+
UCHAR cMask; SI-s:%O
void DeleteIcon(); M-eX>}CDm
void AddIcon(); -2f_e3jF
UINT nCount; Lb(=:Z!{
void SaveBmp(); B%[Yu3gBo
CCaptureDlg(CWnd* pParent = NULL); // standard constructor [/'W#x
// Dialog Data oB+drDp8U
//{{AFX_DATA(CCaptureDlg) }s? 9Hnqa
enum { IDD = IDD_CAPTURE_DIALOG }; K1jE_]@Z
CComboBox m_Key; U4Il1|
M&
BOOL m_bControl; :Oxrw5`=
BOOL m_bAlt; h(ZZ7(ue
BOOL m_bShift; "1Vuf<?C
CString m_Path; \:8
>@Q
CString m_Number; m#ID%[hg$
//}}AFX_DATA $vx]\`
^
// ClassWizard generated virtual function overrides L~>pSP^a
//{{AFX_VIRTUAL(CCaptureDlg) wgY:W:y'N
public: ttgb"Wb%S
virtual BOOL PreTranslateMessage(MSG* pMsg); ]e!9{\X,*
protected: Y'0H2B8
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dxsPX=\:
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); sZ_+6+ :
//}}AFX_VIRTUAL Ubv<3syR'
// Implementation |pA3ZWm
protected: z]K:Amp;Z
HICON m_hIcon; X$)<>e]!>
// Generated message map functions BVU>M*k
//{{AFX_MSG(CCaptureDlg) q9|'!m5K
virtual BOOL OnInitDialog(); `5:b=^'D/
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 4~4D1
afx_msg void OnPaint(); bs/Vn'CE
afx_msg HCURSOR OnQueryDragIcon(); n2cb,b/7
virtual void OnCancel(); c3lU
afx_msg void OnAbout(); qi!+Ceo}
afx_msg void OnBrowse(); 5NHNnDhuL
afx_msg void OnChange(); T@Mrbravc
//}}AFX_MSG DJR_"8
DECLARE_MESSAGE_MAP() |U)M.\h
}; 8(]*J8/wt
#endif E0G"B'x
0.!_k )tu
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "dQ02y
#include "stdafx.h" *d b,N'rK
#include "Capture.h" fgdqp8~
#include "CaptureDlg.h" h8'`g 0
#include <windowsx.h> bL-+
#pragma comment(lib,"hook.lib") dD ?ZF6
#ifdef _DEBUG NSI$uS6
#define new DEBUG_NEW GKIO@!@[
#undef THIS_FILE OlI|.~
static char THIS_FILE[] = __FILE__; 4SlEc|'7@
#endif j`7q7}
#define IDM_SHELL WM_USER+1 `|(S]xPHM
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^Y,nv,gYn
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W"$sN8K>)
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ~Z-o2+xA
class CAboutDlg : public CDialog "n'kv!?\
{ HtpZ5
public: t>Lq
"]1
CAboutDlg(); n<3qr}ZG^
// Dialog Data RzhAXI=
//{{AFX_DATA(CAboutDlg) KDxqz$14-
enum { IDD = IDD_ABOUTBOX }; ?h\fwF3
//}}AFX_DATA t\S=u y
// ClassWizard generated virtual function overrides xl>8B/Zmf#
//{{AFX_VIRTUAL(CAboutDlg) kn%i#Fz
protected: 6
);8z!+
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x,L<{A`z
//}}AFX_VIRTUAL owQSy9Az
// Implementation zo83>bt
protected: P@|
W\
//{{AFX_MSG(CAboutDlg) $Y`oqw?g+^
//}}AFX_MSG JCO+_d#x
DECLARE_MESSAGE_MAP() Gu@n1/m@o
}; 37<^Oly!
n37P$0
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :<gC7UW
{ YxowArV}uz
//{{AFX_DATA_INIT(CAboutDlg) Y<qWG8X
//}}AFX_DATA_INIT 4M*Z1
} ?*LVn~y
~
kwS`
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }iIZA>eF
{ vj%3v4
CDialog::DoDataExchange(pDX); 6({TG&`!]
//{{AFX_DATA_MAP(CAboutDlg) i/|}#yw8A
//}}AFX_DATA_MAP !{q_Q !
} z_f^L %J0
R`KlG/Tk
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ` {/"?s|
//{{AFX_MSG_MAP(CAboutDlg) qBF6LhR
// No message handlers i+90##4<?
//}}AFX_MSG_MAP Z2a~1BL
END_MESSAGE_MAP() 7w\L<vFm
g~p43sVV
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) V9Pw\K!w#\
: CDialog(CCaptureDlg::IDD, pParent) 2:oAS
{ y=!7PB_\|
//{{AFX_DATA_INIT(CCaptureDlg) L9{y1'')
m_bControl = FALSE; Y[!s:3\f
m_bAlt = FALSE; CFXr=.yz
m_bShift = FALSE; B@k2lHks(
m_Path = _T("c:\\"); 56o(gCj?y
m_Number = _T("0 picture captured."); mRO@ZY;5
nCount=0; "*<)pnJ
bRegistered=FALSE; G,!{Q''w
bTray=FALSE; G,e!!J
//}}AFX_DATA_INIT .fAHP
5-
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 X4eoE
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); nD.K*# u
}
SwE bVwB
[[#zB-|
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) m`BE{%
{ |BBo
CDialog::DoDataExchange(pDX); $+|.
@ss
//{{AFX_DATA_MAP(CCaptureDlg) E5q t~:C|
DDX_Control(pDX, IDC_KEY, m_Key); R0~w F>
DDX_Check(pDX, IDC_CONTROL, m_bControl); !LM9
DDX_Check(pDX, IDC_ALT, m_bAlt); FQBE1h@k0u
DDX_Check(pDX, IDC_SHIFT, m_bShift); ',Y`\X
DDX_Text(pDX, IDC_PATH, m_Path); nc3usq
DDX_Text(pDX, IDC_NUMBER, m_Number); U4=m>Ty
//}}AFX_DATA_MAP qC6@
} n|fKwWB\
*b7evU *1
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) % oJH 6F
//{{AFX_MSG_MAP(CCaptureDlg) ]TVc 'G;
ON_WM_SYSCOMMAND() _1G;!eO
ON_WM_PAINT() ;;S9kNp^v
ON_WM_QUERYDRAGICON() }Qa
ON_BN_CLICKED(ID_ABOUT, OnAbout) H1c>3c
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;Wgkf_3
ON_BN_CLICKED(ID_CHANGE, OnChange) MzMVs3w|
//}}AFX_MSG_MAP 9zl-C*9vj
END_MESSAGE_MAP() MbxJ3"@
$px1D$F !
BOOL CCaptureDlg::OnInitDialog() v]\T&w%9
{ ioBYxbY`
CDialog::OnInitDialog(); ^+w1:C 5
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); v:"Y
ASSERT(IDM_ABOUTBOX < 0xF000); )>tT""yEl
CMenu* pSysMenu = GetSystemMenu(FALSE); %/2OP &1<
if (pSysMenu != NULL) l?A~^4(5a/
{ B[~Q0lPih
CString strAboutMenu; <UY9<o
strAboutMenu.LoadString(IDS_ABOUTBOX); &PPYxg<
if (!strAboutMenu.IsEmpty()) 40aD\S>
{ (ys<{Y-;
pSysMenu->AppendMenu(MF_SEPARATOR); &z05h<]
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); N :OLN[
} Q!5W x
} uuQsK. S
SetIcon(m_hIcon, TRUE); // Set big icon _
h/:r1
SetIcon(m_hIcon, FALSE); // Set small icon xb2j
|KY7
m_Key.SetCurSel(0); *B)10R
RegisterHotkey(); NIAji3
CMenu* pMenu=GetSystemMenu(FALSE); :w]NN\
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); v}\Fbe
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); d ATAH}r&
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [HhaBy9
return TRUE; // return TRUE unless you set the focus to a control u"Mf xW`
} #y'p4Xf
7^;-[?l
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $9h^tP'CV
{ >y+?Sz!
if ((nID & 0xFFF0) == IDM_ABOUTBOX) @O/"s~d-
{ Wcbm,O4u
CAboutDlg dlgAbout; drvz
[
9;
dlgAbout.DoModal(); f\FqZ?w
} 0v#p4@Z
else /IlO
{ _FU}IfG>t
CDialog::OnSysCommand(nID, lParam); 3:<[;yo
} cqaq~
} OepQ Z|2
Gzp*Vr
void CCaptureDlg::OnPaint() v%kl*K`*
{ }zIWagC6
if (IsIconic()) )Y`ybADd3
{ Bjh8uW
G
CPaintDC dc(this); // device context for painting `a[
V_4wO
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); j)wrF@W
// Center icon in client rectangle Kpkpr`:)]
int cxIcon = GetSystemMetrics(SM_CXICON); IH`7ou {
int cyIcon = GetSystemMetrics(SM_CYICON); MAp#1+k
CRect rect; ..x2
GetClientRect(&rect); |tC= j.
int x = (rect.Width() - cxIcon + 1) / 2; QRx9;!~b}
int y = (rect.Height() - cyIcon + 1) / 2; 3vkzN
// Draw the icon "MD6 <H
dc.DrawIcon(x, y, m_hIcon); 8?rq{&$t
} |n;5D,r0C
else C)~%(< D
{ OnyAM{$g
CDialog::OnPaint(); T+PERz(
} TrNh,5+b
} a]J>2A@-I
l
GJ N;G7
HCURSOR CCaptureDlg::OnQueryDragIcon() h7 mk<
{ 'J)9#
return (HCURSOR) m_hIcon; 2V~uPZ
} m{&lU@uL
vs>Pd |p;
void CCaptureDlg::OnCancel() (w`_{%T
{ 0>"y)T3
if(bTray) 11Uu5e!.
DeleteIcon(); pU<GI@gU
CDialog::OnCancel(); F$'po#
} KO/#t~
6\Tq,I7
void CCaptureDlg::OnAbout() B`w8d[cL7
{ k@pEs# a
CAboutDlg dlg; )NTpb
dlg.DoModal(); ]bbP_n8
} 3NdO3-~)
$oJjgA xcZ
void CCaptureDlg::OnBrowse() #bCUI*N"P
{ =@&>r5W1
CString str; '@zMZc!
BROWSEINFO bi; <tm=
char name[MAX_PATH]; +jS<n13T
ZeroMemory(&bi,sizeof(BROWSEINFO)); '+GY6Ecg
bi.hwndOwner=GetSafeHwnd(); ERIF#EY
bi.pszDisplayName=name; Js.G
hTs
bi.lpszTitle="Select folder"; +HjSU2
bi.ulFlags=BIF_RETURNONLYFSDIRS; Zad>iw}
LPITEMIDLIST idl=SHBrowseForFolder(&bi); S_^;#=_c
if(idl==NULL) =iB$4d2
return; "yl6WG#J
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >jnx2$
str.ReleaseBuffer(); flz7{W
m_Path=str; +U>Y.YP
if(str.GetAt(str.GetLength()-1)!='\\') 9{rE7OX*A
m_Path+="\\"; F6\4[B
UpdateData(FALSE); 7\ X_%SM %
} 2IP<6l8N
=$ T[
void CCaptureDlg::SaveBmp() TH55@1W,[
{ /7ShE-.5#
CDC dc; F&Rr&m
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 79D;0
CBitmap bm; Rl_1g`84
int Width=GetSystemMetrics(SM_CXSCREEN); j3S!uA?
int Height=GetSystemMetrics(SM_CYSCREEN); >>M7#hmt
bm.CreateCompatibleBitmap(&dc,Width,Height); ,s6lB0
CDC tdc; B,` `2\B
tdc.CreateCompatibleDC(&dc); N7GZ'-t^Er
CBitmap*pOld=tdc.SelectObject(&bm); HdTB[(
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); W"\+jHF"
tdc.SelectObject(pOld); of >
BITMAP btm; =L;g:hc<
bm.GetBitmap(&btm); eT?vZH[N
DWORD size=btm.bmWidthBytes*btm.bmHeight; `uqe[u;`6
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); k^#*x2b
BITMAPINFOHEADER bih; 4^9qs%&
bih.biBitCount=btm.bmBitsPixel; >wR)p\UEb
bih.biClrImportant=0; s7\Ee-x)s
bih.biClrUsed=0; uz:r'+v
bih.biCompression=0; Z`Jt6QgW
bih.biHeight=btm.bmHeight; BAG#YZB
bih.biPlanes=1; nITkgN:s
bih.biSize=sizeof(BITMAPINFOHEADER); |x=(}g
bih.biSizeImage=size; ,#9i=gp
bih.biWidth=btm.bmWidth; +i}uRO
bih.biXPelsPerMeter=0; MlLM
$Y-@
bih.biYPelsPerMeter=0; ,Ww.W'#P
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); hM&VMa [
static int filecount=0; ? :A%$T
CString name; Tm0\Oue0
name.Format("pict%04d.bmp",filecount++); <-gGm=R_ $
name=m_Path+name; %`s1
Ocvp
BITMAPFILEHEADER bfh; |`|zo+aW
bfh.bfReserved1=bfh.bfReserved2=0; 9`CJhu
bfh.bfType=((WORD)('M'<< 8)|'B'); iAeq%N1(0
bfh.bfSize=54+size; BQv*8Hg
B6
bfh.bfOffBits=54; AmUH]+5KT
CFile bf; MM&qLAa"f
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ M+)ENve
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 'b6qEU#
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !<F5W<V
bf.WriteHuge(lpData,size); .3>q3sS
bf.Close(); e:.D^GFi
nCount++; WopA7J,
} ]4'V59\
GlobalFreePtr(lpData); q4vHsy36
if(nCount==1) '$4&q629d
m_Number.Format("%d picture captured.",nCount); OLGMy5
else @Y ?p-&
m_Number.Format("%d pictures captured.",nCount); 5kHU'D
UpdateData(FALSE); B- |C%~fe
} c0_512
H2+V1J=
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -k%|sqDZj
{ _^$F^}{&
if(pMsg -> message == WM_KEYDOWN) ~|oB|>
{ ;g?o~ev 8
if(pMsg -> wParam == VK_ESCAPE) x4`|[
return TRUE; k`\L-*:Ji
if(pMsg -> wParam == VK_RETURN) +xU=7chA
return TRUE; 7c<_j55(
} &Gm3
return CDialog::PreTranslateMessage(pMsg); jS|jPk|I.
} ,o0[^-b<
s-F3(mc(
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -AQ
7Bd
{ M(ie1Ju
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G*-7}7OAs
SaveBmp();
BDX>J3h
return FALSE; UI wTf2B
} [L
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){
=A_{U(>
CMenu pop; 7p{2&YhB
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); KPZqPtb;
CMenu*pMenu=pop.GetSubMenu(0); @-ir
pMenu->SetDefaultItem(ID_EXITICON); ,fhwDqR
?
CPoint pt; yATXN>]l
GetCursorPos(&pt); {axRq'=
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ApcE)mjpc
if(id==ID_EXITICON) ^~3{n
DeleteIcon(); _z#S8Y
else if(id==ID_EXIT) mhNgXp)_56
OnCancel(); y#nyH0U
return FALSE; Nig)!4CG
} <[17&F0
LRESULT res= CDialog::WindowProc(message, wParam, lParam); !3"Hn
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ("=B,%F_
AddIcon(); A8ClkLC;I
return res; #-PUm0|
} JK'tdvs~
[h.i,%Ua"P
void CCaptureDlg::AddIcon() +X>Aj=#
{ oCKn
NOTIFYICONDATA data; +@do<2l]
data.cbSize=sizeof(NOTIFYICONDATA); `Tr !Gj_
CString tip; %.:]4jhk
tip.LoadString(IDS_ICONTIP); {y<E_y
x1
data.hIcon=GetIcon(0); kvt^s0T8Q
data.hWnd=GetSafeHwnd(); )<T2J0*
strcpy(data.szTip,tip); ^>s{o5H&
data.uCallbackMessage=IDM_SHELL; C-(O*hK
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; xz}=C:s
data.uID=98; kP&Ekjt@
Shell_NotifyIcon(NIM_ADD,&data); Ft @ZK!'@
ShowWindow(SW_HIDE); yq` ,)
bTray=TRUE; `CG% Y>+
} prGp/"E
zKf0 :X
void CCaptureDlg::DeleteIcon() FCChB7c`
{ P_Exh]P
NOTIFYICONDATA data; F&OcI.OTXF
data.cbSize=sizeof(NOTIFYICONDATA); 6h&i<->
data.hWnd=GetSafeHwnd(); ~tB9kLFG
data.uID=98; FuP~_ E~
Shell_NotifyIcon(NIM_DELETE,&data); = Fwzm^}6
ShowWindow(SW_SHOW); $-n_$jLY
SetForegroundWindow(); jZ?^ |1
ShowWindow(SW_SHOWNORMAL); Z}>+!Z
bTray=FALSE; D ~NWP%H
} VWMr\]g
-B:O0;f
void CCaptureDlg::OnChange() p8z"Jn2P
{ ho6,&Bp8
RegisterHotkey(); eGI&4JgJ.
} 'uLYah
px^brzLQo
BOOL CCaptureDlg::RegisterHotkey() oN(F$Nvk
{ ;!<@Fm9W
UpdateData(); A$]#f
UCHAR mask=0; Hnbd<?y
UCHAR key=0; B(pHo&ox
if(m_bControl) *35o$P46
mask|=4; wtfM}MW\
if(m_bAlt) D!bi>]Yd
mask|=2; <-!'V,c
if(m_bShift) )umW-A
mask|=1; h6e,w$IL
key=Key_Table[m_Key.GetCurSel()];
:a M@"#F
if(bRegistered){ 5:l"*
DeleteHotkey(GetSafeHwnd(),cKey,cMask); dg;E,'e_
p
bRegistered=FALSE; P~@I`r567
} 'WoB\y569
cMask=mask; ?$4CgN-
cKey=key; \6,Z<.I
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ypY7uYO^"
return bRegistered; %?z;'Y7D
} w6'8L s
o6S`7uwJ*/
四、小结 kk/vgte-)e
cqb]LC
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。