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:
qr)v'aC3
uW}Hvj;0a* 一、实现方法
5/B#) gm tYs8)\{ 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:
.P)s4rQ\ ,
Aq9fyC% #pragma data_seg("shareddata")
^I X%dzM HHOOK hHook =NULL; //钩子句柄
_1>SG2h{fV UINT nHookCount =0; //挂接的程序数目
fav5e'[$ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
R=-+YBw7/ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
*8$>Whr static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
X"h%tsuw static int KeyCount =0;
-7>^
rR V static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
`"a? a5]k #pragma data_seg()
8P,l>HA WD15pq l 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
iH-bo@ 2E$^_YT
C 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:
>=if8t! 2E^"r jLm BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
)]%e cKey,UCHAR cMask)
(VgNb&Yo9 {
7:n?PN(p6a BOOL bAdded=FALSE;
(y1$MYZQ for(int index=0;index<MAX_KEY;index++){
SQ}S4r if(hCallWnd[index]==0){
5;W\2yj hCallWnd[index]=hWnd;
sYGR-:K HotKey[index]=cKey;
HSNOL HotKeyMask[index]=cMask;
m6b$Xyq[ bAdded=TRUE;
gUl1CH& KeyCount++;
f:]u`ziM break;
WgE@8 9 }
NW
z9C=y }
di7A/B return bAdded;
Da-u-_~ }
B@-|b //删除热键
hZcmP"wgC1 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\B_i$<Sz {
zhNQuK,L BOOL bRemoved=FALSE;
?-e7e% for(int index=0;index<MAX_KEY;index++){
SOVjEo4'3 if(hCallWnd[index]==hWnd){
>Q;
g0\I_ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
O?CdAnhQc` hCallWnd[index]=NULL;
d]U`?A, HotKey[index]=0;
YWEYHr;%^? HotKeyMask[index]=0;
6`acg'sk> bRemoved=TRUE;
o`idg[l. KeyCount--;
(Aorx #z break;
P{?;T5ap6 }
G'u|Q
mb1 }
'e F% }
`M&P[.9Pz return bRemoved;
5J
ySFG3 }
j(j#0dXLh .}o~VT:!?Y
Nj+a2[ DLL中的钩子函数如下:
;_}~%-_
~ KYp[Gs LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
AcKU^T+ {
iC\%_5/_ BOOL bProcessed=FALSE;
alFNSRY if(HC_ACTION==nCode)
le.anJAr {
:vpl+)n if((lParam&0xc0000000)==0xc0000000){// 有键松开
tZbFvk2 switch(wParam)
H( vx/q {
C,fY.CeI case VK_MENU:
Pb#P`L7OB MaskBits&=~ALTBIT;
vm8$:W2 } break;
!v0"$V5+i case VK_CONTROL:
`xCOR MaskBits&=~CTRLBIT;
CphFv!k'Z break;
_ Hc%4I case VK_SHIFT:
;`DD}j` MaskBits&=~SHIFTBIT;
Xh?4mKgu break;
P$_&
default: //judge the key and send message
K4:
$= break;
P1MvtI4gm }
=~&VdPZ for(int index=0;index<MAX_KEY;index++){
)>V?+L5M if(hCallWnd[index]==NULL)
;+a2\j+ continue;
msiu8E if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=-w;zx {
xYPxg! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
z`4c 4h]I bProcessed=TRUE;
RND9D\7 }
V^WU8x }
Fk{J@Y }
e4DMO*6 else if((lParam&0xc000ffff)==1){ //有键按下
nob0T5G switch(wParam)
M ,`w A {
zEj#arSE4 case VK_MENU:
?E6^!4=, MaskBits|=ALTBIT;
+1QK}H~ break;
2VA!&`I case VK_CONTROL:
HJIC<U MaskBits|=CTRLBIT;
\|.7-X break;
X d3}Vn= case VK_SHIFT:
$#e1SS32 MaskBits|=SHIFTBIT;
wPX*%0] break;
8#w)X/ default: //judge the key and send message
##cnFQCB break;
&dr@6-xaq }
i)MEK#{ for(int index=0;index<MAX_KEY;index++){
le8 #Z}p if(hCallWnd[index]==NULL)
2Q@Y^t
continue;
y \D=Z
N@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
0mTr-`s {
xR?V,uV'$& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
]n;1x1' bProcessed=TRUE;
&l m# }
)"|||\Iv }
|0g{"}% }
2}vNSQvG if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
MG{l~|\x) for(int index=0;index<MAX_KEY;index++){
I-DXb
M if(hCallWnd[index]==NULL)
8PBvV[ continue;
_[t8rl if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
?T!)X)A# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
yz8jU*H //lParam的意义可看MSDN中WM_KEYDOWN部分
ml0*1Dw }
Z.1>
kZ }
du_4eB }
G69GoT return CallNextHookEx( hHook, nCode, wParam, lParam );
XogVpkA }
rzUlO5?R= P6\6?am 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:
3TS_-l !Ms[eB BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
yCP4r6X0 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
/TV=$gB` /<{: I \< 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
D d,2;#_ 5)UQWnd5 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
dg_G s>?2 {
> 'i if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
e#S0Fk)z {
A&"%os //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
^x m$EY*Y, SaveBmp();
?6"{!s{v return FALSE;
%\Wf^6Y^ }
-oP'4QVb …… //其它处理及默认处理
]rN#B-aAr }
R[jEvyD>( &%mXYj3y5 ?!'ZfQ:zK 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。
iM]o"qOQm Nd@~>&F 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。
Ef)yQ *F`A S> 二、编程步骤
h@ ) -LW[7s$ 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";
g[[;w*;z 4vWkT8HQ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
=d)-Fd2li >V$ Gx>I 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;
])}]/Qw Qk9 76 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;
}H"kU2l [p;E~-S 5、 添加代码,编译运行程序。
}4//@J?: qfoD 三、程序代码
{d<;BLA T'H::^9:E ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
n, i'Dhzk #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
N?P%-/7 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
oCS2E =O& #if _MSC_VER > 1000
,9D+brm #pragma once
Zd:Taieh@ #endif // _MSC_VER > 1000
0#*Lw }qi #ifndef __AFXWIN_H__
c>"cX& #error include 'stdafx.h' before including this file for PCH
ZJ*g))k7 #endif
'#/G,%m<!i #include "resource.h" // main symbols
tjT>VwqH class CHookApp : public CWinApp
/Q{P3:k {
;j8)KC public:
m3<+yz$!r CHookApp();
oXXC@[??}N // Overrides
YXo|~p;=Y // ClassWizard generated virtual function overrides
Z\}K{# //{{AFX_VIRTUAL(CHookApp)
pmWr]G3,* public:
Av' GB virtual BOOL InitInstance();
/X'(3'a virtual int ExitInstance();
G 2!xPHz //}}AFX_VIRTUAL
u8GMUN //{{AFX_MSG(CHookApp)
c%m3}mrb // NOTE - the ClassWizard will add and remove member functions here.
U.!lTLjfLz // DO NOT EDIT what you see in these blocks of generated code !
~{,X3-S_H //}}AFX_MSG
6/V3.UP- DECLARE_MESSAGE_MAP()
\p{5D`HY };
e]=lKxFh&l LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
a^d8I BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
qMt++*Ls BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
R:Q0=PzDi# BOOL InitHotkey();
L2Pujk BOOL UnInit();
9o*,P,j'} #endif
6(d }W2GP ,Uhb //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
>9e(.6&2XZ #include "stdafx.h"
G6@M&u5RT #include "hook.h"
@f]{>OS #include <windowsx.h>
A+J*e #ifdef _DEBUG
_BdE<
!r #define new DEBUG_NEW
0sca4G0{ #undef THIS_FILE
Bw%Qbs0Q static char THIS_FILE[] = __FILE__;
+5VLw #endif
*}k;L74| #define MAX_KEY 100
^sN ( #define CTRLBIT 0x04
yeDsJ/L #define ALTBIT 0x02
^V$Ajt #define SHIFTBIT 0x01
a<}#HfC;' #pragma data_seg("shareddata")
<Rh6r}f HHOOK hHook =NULL;
r}[7x]sP UINT nHookCount =0;
J:&[59 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
WOuEW w= static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
]e.JNo static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
^uv<6 static int KeyCount =0;
mKo C.J static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Vq;dJ%sY #pragma data_seg()
4vBL6!z:Z HINSTANCE hins;
~.;<
Bj void VerifyWindow();
?v>ET2wD BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
-46C!6a //{{AFX_MSG_MAP(CHookApp)
J+d1&Tw& // NOTE - the ClassWizard will add and remove mapping macros here.
ok|qyN+ // DO NOT EDIT what you see in these blocks of generated code!
Z R/#V7Pj //}}AFX_MSG_MAP
fd-q3_f END_MESSAGE_MAP()
y6]vl=^L z~`b\A,$ CHookApp::CHookApp()
b#7{{@H {
x#Sqn# // TODO: add construction code here,
!uQPc // Place all significant initialization in InitInstance
a5a($D }
Reatdh yR(x+Gs{] CHookApp theApp;
o sKKt?^? LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
a!O0,y {
Q0EiEX) BOOL bProcessed=FALSE;
8Q_SRwN if(HC_ACTION==nCode)
>jD[X5Y {
p<M\U"5Ye if((lParam&0xc0000000)==0xc0000000){// Key up
kbM3 switch(wParam)
5mb]Q)f9- {
*/|BpakD< case VK_MENU:
pAT7)Ch
MaskBits&=~ALTBIT;
M(/r%-D break;
g<~Cpd case VK_CONTROL:
!.d@L6 MaskBits&=~CTRLBIT;
9k{PBAP break;
2RSt)3!}, case VK_SHIFT:
-[-wkC8a MaskBits&=~SHIFTBIT;
B(M6@1m_ break;
..rOsg{ default: //judge the key and send message
"~'b break;
n=[/Z! }
Yk=PS[f for(int index=0;index<MAX_KEY;index++){
KEWTBBg if(hCallWnd[index]==NULL)
>,td(= : continue;
hdrm!aBd if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
z[Xd%mhjO {
P#AW\d^"B SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
K'GBMnjD bProcessed=TRUE;
/~3r;M }
T?X_c"{8M }
R=jI?p }
(DI>5.x" else if((lParam&0xc000ffff)==1){ //Key down
6'Fd GS switch(wParam)
qT+%;( {
X7rMeu case VK_MENU:
uCcYPvm MaskBits|=ALTBIT;
U*)8G break;
BqT y~{)+ case VK_CONTROL:
AJ=qn a MaskBits|=CTRLBIT;
I1X-s break;
!jTcsN% case VK_SHIFT:
S_Wrw z MaskBits|=SHIFTBIT;
8SGo9[U2 break;
@H=:)*; default: //judge the key and send message
x@[rms
break;
_fKou2$yz }
xoN3 for(int index=0;index<MAX_KEY;index++)
i*Z"Me {
-PfX0y9n if(hCallWnd[index]==NULL)
mGK|ihYu continue;
6ZP"p<xX if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Q637N|01 {
`G}TG( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
(=om,g} bProcessed=TRUE;
maNl^i }
3eF-8Z(f }
r [*Vqcz }
<_-hRbS if(!bProcessed){
~Yy>zUH^X for(int index=0;index<MAX_KEY;index++){
Rd#WMo2Xd if(hCallWnd[index]==NULL)
ojanBg
continue;
rogT~G}q if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Rx}$0c0 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
'!eKTC> }
~GZY 5HF }
):[7E(F= }
rp;b" q return CallNextHookEx( hHook, nCode, wParam, lParam );
}F#okU }
i uF*.hc,% IhVO@KJI BOOL InitHotkey()
vwxXgk {
?k(7 LX0j if(hHook!=NULL){
;;#qmGoE nHookCount++;
r2,.abo return TRUE;
N(Fp0 }
{A05u3} else
'ZDp5pCC; hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
oY933i@l)P if(hHook!=NULL)
AT2n VakL nHookCount++;
75XJL;W # return (hHook!=NULL);
=\H!GT }
d^{RQ BOOL UnInit()
^rifRY-,yO {
xe^Gs]fm if(nHookCount>1){
e4 >_v(' nHookCount--;
6">+
~
G return TRUE;
,g2ij }
e,W%uH>X BOOL unhooked = UnhookWindowsHookEx(hHook);
NTYg[VTr if(unhooked==TRUE){
%H]ptH5 nHookCount=0;
?#}N1k\S hHook=NULL;
=A83W/4 }
e&&53? return unhooked;
BRgXr }
JvVWG'Z" iKX-myCz BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]&lY%"U$i {
^hZ0IM BOOL bAdded=FALSE;
)b)-ZS7 for(int index=0;index<MAX_KEY;index++){
xc=b
|:A if(hCallWnd[index]==0){
n>BkTaI hCallWnd[index]=hWnd;
MkfBuW;) HotKey[index]=cKey;
U:^PC
x` HotKeyMask[index]=cMask;
--$
4Q(# bAdded=TRUE;
old(i:2 KeyCount++;
: y%d break;
x!5'`A!W% }
Vl&?U }
,-8"R`UI8 return bAdded;
*Q?tl\E }
#49kjv@ 3G}x;Cp\D BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*U&0<{|T {
"_-Po^u=r BOOL bRemoved=FALSE;
%A1o.{H for(int index=0;index<MAX_KEY;index++){
TO]@
Zu1 if(hCallWnd[index]==hWnd){
~*z% e*EL if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
RtTJ5@V( hCallWnd[index]=NULL;
|$8~?7Jv HotKey[index]=0;
c;Pe/ d HotKeyMask[index]=0;
zv0l,-o bRemoved=TRUE;
Yc_8r+;( KeyCount--;
p<2L.\6" break;
2^h27A }
<m)$K }
J8uLJ }
:XZU&Sr" return bRemoved;
hI]Hp3S }
9g'LkP ?XrQ53 void VerifyWindow()
_(%d(E2? {
<D<4BnZ( for(int i=0;i<MAX_KEY;i++){
"p_J8 if(hCallWnd
!=NULL){ $rv8K j+
if(!IsWindow(hCallWnd)){ [uC]*G]
hCallWnd=NULL; I&}L*Z?`
HotKey=0; e!N:,`R
5
HotKeyMask=0; n.!#P|
KeyCount--; RYQ<Zr$!
} #@YPic"n7`
} b=yx7v"r
} A9I{2qW9+Z
} uki#/GzaO
+ga k#M"n\
BOOL CHookApp::InitInstance() HHDl8lo
{ DFZkh^PFd
AFX_MANAGE_STATE(AfxGetStaticModuleState()); I`-8Air5f
hins=AfxGetInstanceHandle(); 5na~@-9p
InitHotkey(); Uc7mOa}4
return CWinApp::InitInstance(); @XLy7_}
} `Q|*1
(eI5_`'VC
int CHookApp::ExitInstance() KHe=O1 %QO
{ *X'Y$x>f
VerifyWindow(); adCU61t
UnInit(); -lbm*
-(
return CWinApp::ExitInstance(); XG{{ 2f
} $$|rr G
Cn'(<bl
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *SU\ABcov
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G18F&c~
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ sqEI4~514
#if _MSC_VER > 1000 $?Yry.2
#pragma once /oR0+sH]
#endif // _MSC_VER > 1000 Ixb=L(V
2|3)S`WZl
class CCaptureDlg : public CDialog RQ vft
{ i6dHrx]:,
// Construction "?]{%-u
public: iHeN9 cl
BOOL bTray; z:8eEq3w
BOOL bRegistered; 3h;{!|-3
BOOL RegisterHotkey(); Y2a5bc P
UCHAR cKey; h1B? 8pD
UCHAR cMask; qaiNz S@q
void DeleteIcon(); &+Z,hs9%
void AddIcon(); !\zWF
UINT nCount; jN{Xfjmfv
void SaveBmp(); LPZF)@|`
CCaptureDlg(CWnd* pParent = NULL); // standard constructor V=R 3)GC
// Dialog Data P\yDa*m
//{{AFX_DATA(CCaptureDlg) +o\:d1y
enum { IDD = IDD_CAPTURE_DIALOG }; ah+~y,Gl
CComboBox m_Key; C7rNV0.Fq
BOOL m_bControl; JJP08oP
BOOL m_bAlt; S>h;K`
BOOL m_bShift; 15%w 8u
CString m_Path; '8Q]C*Z
CString m_Number; +c(zo4nZ
//}}AFX_DATA YLqGRE`W
// ClassWizard generated virtual function overrides ykl
.1(
//{{AFX_VIRTUAL(CCaptureDlg) +ln9c
public: 3.|S
virtual BOOL PreTranslateMessage(MSG* pMsg); F~T]u2qt
protected: }Mst jm
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }#L^! \V}
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *@Lp`thq
//}}AFX_VIRTUAL p`b"-[93
// Implementation 61SlVec*o8
protected: 2)G
%)'
HICON m_hIcon; -e_hrCW&9
// Generated message map functions 3kw,(-'1
//{{AFX_MSG(CCaptureDlg) FG6h,7+
virtual BOOL OnInitDialog();
@G8lr
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #*QO3y~ZM
afx_msg void OnPaint(); M9!HQ
afx_msg HCURSOR OnQueryDragIcon(); :}5j##N
virtual void OnCancel(); 6N!Q:x^4(T
afx_msg void OnAbout(); 't1ax^-g
afx_msg void OnBrowse(); )Q1"\\2j0
afx_msg void OnChange(); 6g 5#TpCh
//}}AFX_MSG ^A!Qc=#z}
DECLARE_MESSAGE_MAP() ;T"zV{;7BR
}; _"E%xM*r
#endif 6VS4y-N
3vuivU.3
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file F20E_2;@@
#include "stdafx.h" M$y+q
^
#include "Capture.h" FG%X~L<d,)
#include "CaptureDlg.h" ?ATOXy
#include <windowsx.h> -wp|RD,}(
#pragma comment(lib,"hook.lib") Lhl]g^SN
#ifdef _DEBUG BUWqIdg
#define new DEBUG_NEW 0+?7EL~
#undef THIS_FILE /I1h2E
static char THIS_FILE[] = __FILE__; 0rOfrTNOz%
#endif )k\H@Dy%$
#define IDM_SHELL WM_USER+1 XlV0* }S
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U7K,AflK?M
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hWM<
0=
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; mtJ9nC
class CAboutDlg : public CDialog '?!zG{x
{ ~k!j+>yT
public: 4,sJE2"[9
CAboutDlg(); \DYWy*pe
// Dialog Data Q3
u8bx|E
//{{AFX_DATA(CAboutDlg) w\(.3W7
enum { IDD = IDD_ABOUTBOX }; NL!u<6y
//}}AFX_DATA ABQa 3{v
// ClassWizard generated virtual function overrides >OL 3H$F
//{{AFX_VIRTUAL(CAboutDlg) /q<__N
protected: &:/hrighH
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support TV<'8L
//}}AFX_VIRTUAL R%{a1r>9h
// Implementation Rtb7|
protected: 19HM])Zw\
//{{AFX_MSG(CAboutDlg) f({Ei`|
//}}AFX_MSG {{B%f.
DECLARE_MESSAGE_MAP() ix([mQg
}; 7({]x*o*%
Hc>m;[M)l
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) gG]Eeu+z
{ H| 8Qp*
//{{AFX_DATA_INIT(CAboutDlg) $K]m{
//}}AFX_DATA_INIT Z1 Bp+a3
} 6A>dhU
b6Wqr/
void CAboutDlg::DoDataExchange(CDataExchange* pDX) byLft1
{ b:Wm8pp?
CDialog::DoDataExchange(pDX); oE+R3[D?r
//{{AFX_DATA_MAP(CAboutDlg) 2^y^q2(r
//}}AFX_DATA_MAP <}E!w_yi
} pnjXf.g"O
4(|cG7>9-
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 5MN8D COF
//{{AFX_MSG_MAP(CAboutDlg) +?:7O=Y
// No message handlers z`!XhU
//}}AFX_MSG_MAP J&M
o%"[)
END_MESSAGE_MAP() 7[> 6i
b\3Oyp>
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?98("T|y;
: CDialog(CCaptureDlg::IDD, pParent) ~rDZ?~%
{ AfX}y+Ah
//{{AFX_DATA_INIT(CCaptureDlg) ,u+PyG7 cb
m_bControl = FALSE; Bk*F_>X"
m_bAlt = FALSE; 3on7~*
m_bShift = FALSE; j/fzzI0@
m_Path = _T("c:\\"); f|B=_p80
m_Number = _T("0 picture captured."); JBXrFC;
nCount=0; v3aYc:C
bRegistered=FALSE; }q $5ig
bTray=FALSE; y0#u9t"Z;
//}}AFX_DATA_INIT oXb;w@:
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Fx;QU)1l3
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )6q,>whI]
} r[BVvX/,F
l8I /0`_
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) swK-/$#
{ F({HP)9b
CDialog::DoDataExchange(pDX); hEBY8=gK
//{{AFX_DATA_MAP(CCaptureDlg) ]^lw*724'>
DDX_Control(pDX, IDC_KEY, m_Key); }% `.h"
DDX_Check(pDX, IDC_CONTROL, m_bControl); #~7ip\Uf[
DDX_Check(pDX, IDC_ALT, m_bAlt); zG ^$"f2
DDX_Check(pDX, IDC_SHIFT, m_bShift); P(H8[ ,
DDX_Text(pDX, IDC_PATH, m_Path); PcA2/!a
DDX_Text(pDX, IDC_NUMBER, m_Number); )TVFtI=,NN
//}}AFX_DATA_MAP v.pBX<
} tnPv70m
j6Yy6X]
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) K
P Oa|$
//{{AFX_MSG_MAP(CCaptureDlg) E%rk[wI
ON_WM_SYSCOMMAND() n/Sw P
ON_WM_PAINT() %kS(LlL+6
ON_WM_QUERYDRAGICON() )(ImLbM)
ON_BN_CLICKED(ID_ABOUT, OnAbout) Hea;?4Vg
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) N+Y]st+
ON_BN_CLICKED(ID_CHANGE, OnChange) I aGq]z
//}}AFX_MSG_MAP LIcM3_.
END_MESSAGE_MAP() [R=yF ~-
3~uW I%I`
BOOL CCaptureDlg::OnInitDialog() GT0Of~?f
{ P*FMwrJj>r
CDialog::OnInitDialog(); IF44F3(V4
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "uaMk}[ <!
ASSERT(IDM_ABOUTBOX < 0xF000); lfqiyYFm
CMenu* pSysMenu = GetSystemMenu(FALSE); t
m7^yn:
if (pSysMenu != NULL) f"%{%M$K
{ +y&Tf#.V/A
CString strAboutMenu; y%%}k
strAboutMenu.LoadString(IDS_ABOUTBOX); bgK'{_o-
if (!strAboutMenu.IsEmpty()) _#r+ !e
{ E`?3PA8
pSysMenu->AppendMenu(MF_SEPARATOR); [co% :xJu
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); gP0LCK>
} Bj1?x
} {]%0lf:
SetIcon(m_hIcon, TRUE); // Set big icon \l9qt5rS
SetIcon(m_hIcon, FALSE); // Set small icon @cFJeOC|
m_Key.SetCurSel(0); czS+<
w
RegisterHotkey(); S7/eS)SQR
CMenu* pMenu=GetSystemMenu(FALSE); uTKD 4yig
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 2QJ{a46}
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,N!o
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2E}*v5b,
return TRUE; // return TRUE unless you set the focus to a control P_*" dza
} _V7r1fY:
X!9 B2w
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #,":vr
{ j$?{\iXZ
if ((nID & 0xFFF0) == IDM_ABOUTBOX) a1_GIM0
{ AlAY iUw{
CAboutDlg dlgAbout; 9}PhN<Gd
dlgAbout.DoModal(); Y8-86 *zC
} f;W|\z'
else 7?GIS '
{ 8B\2Zfe
CDialog::OnSysCommand(nID, lParam);
^,/RO5
} .k%[4:Fe
} ?~hHGf\^b6
Qo;zHZ'
void CCaptureDlg::OnPaint() BqD'8zLD
{ Rb%8)t
x
if (IsIconic()) auK?](U
{ 'VzP};
CPaintDC dc(this); // device context for painting UA48Ug
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *>n;SuT_
// Center icon in client rectangle {>DEsO
int cxIcon = GetSystemMetrics(SM_CXICON); qz0;p=$8Z
int cyIcon = GetSystemMetrics(SM_CYICON); ;C3US)j
CRect rect; VGpWg rmHk
GetClientRect(&rect); O(D~_O.
int x = (rect.Width() - cxIcon + 1) / 2; 2O.i\cH
int y = (rect.Height() - cyIcon + 1) / 2; ]6TATPIr
// Draw the icon uRZ ZxZ
dc.DrawIcon(x, y, m_hIcon); _kU:Z
} o<COm9)i
else 0K`#>}W#X
{ y5?RVlKJ
CDialog::OnPaint(); Ji>o!
} n%-R[vW
} W4pL ,(S
9~]~#Uj
HCURSOR CCaptureDlg::OnQueryDragIcon() mlJ!:WG
{ 5|o6v1bM
return (HCURSOR) m_hIcon; "4riSxEyF
} 4dO~C
eYN5;bx)W
void CCaptureDlg::OnCancel() 6{n!Cb[e
{ F'4w;-ax
if(bTray) 1(I6.BHW
DeleteIcon(); q7_ m&-0)
CDialog::OnCancel(); nD`w/0hT<
} 9Iwe2lu
Y2n!>[[.
void CCaptureDlg::OnAbout() BK)$'AqO
{ g;qx">xJ`o
CAboutDlg dlg; n
`&/D
dlg.DoModal(); 1FlX'[vh
} ++6`sMJ
="Ho%*@6
void CCaptureDlg::OnBrowse() *AO,^R&e.
{
'EbWFMjy
CString str; OBOtu u.
BROWSEINFO bi; p"n$!ilbm
char name[MAX_PATH]; fGUE<l
ZeroMemory(&bi,sizeof(BROWSEINFO)); >O*IQ[r-
bi.hwndOwner=GetSafeHwnd(); CE#gfP
bi.pszDisplayName=name; F`gi_;c
bi.lpszTitle="Select folder"; *=]&&<
bi.ulFlags=BIF_RETURNONLYFSDIRS; ^(vs.U^U<
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Gft%Mq
v
if(idl==NULL) "D63I|O)
return; +jS|2d
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Sdt`i
str.ReleaseBuffer(); 6$kq aS##
m_Path=str; F Sw\_[^CQ
if(str.GetAt(str.GetLength()-1)!='\\') ok!L.ac
m_Path+="\\"; [fAV5U
UpdateData(FALSE); GFeQ%l`7F
} Qw-~>d
QEz?w}b*
void CCaptureDlg::SaveBmp() YB(Q\hT~\;
{ (7*%K&x
CDC dc; , w{e
dc.CreateDC("DISPLAY",NULL,NULL,NULL); W-mQjJ`,B
CBitmap bm; B:'J`M"N
int Width=GetSystemMetrics(SM_CXSCREEN); c~z82iXNO
int Height=GetSystemMetrics(SM_CYSCREEN); s/$?^qtyC
bm.CreateCompatibleBitmap(&dc,Width,Height); qh9Z50E9
CDC tdc; 8K:y\1
tdc.CreateCompatibleDC(&dc); lAb*fafQy
CBitmap*pOld=tdc.SelectObject(&bm); /t+f{VX$
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); o /j*d3
tdc.SelectObject(pOld); (;T^8mI2
BITMAP btm; :r{<zd>;
bm.GetBitmap(&btm); /]K^
rw[
DWORD size=btm.bmWidthBytes*btm.bmHeight; a1EOJ^}0
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &"yx<&c}
BITMAPINFOHEADER bih; ]^h]t~
bih.biBitCount=btm.bmBitsPixel; T|nDTezr
bih.biClrImportant=0; z@!`:'ak
bih.biClrUsed=0; "W6uV!
bih.biCompression=0; OLyf8&AU@
bih.biHeight=btm.bmHeight; 't:;irLW.
bih.biPlanes=1; OI|[roMK
bih.biSize=sizeof(BITMAPINFOHEADER); b$N2z
bih.biSizeImage=size; 9IjIIM2y
bih.biWidth=btm.bmWidth; yA)/Q
Yge
bih.biXPelsPerMeter=0; \pPY37l
bih.biYPelsPerMeter=0; X <f8,n
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ]{3)^axW;
static int filecount=0; l4F%VR4KT
CString name; 2BQ
j
name.Format("pict%04d.bmp",filecount++); Cn,d?H
name=m_Path+name; g;pcZ9o
BITMAPFILEHEADER bfh; iW$_zgN
bfh.bfReserved1=bfh.bfReserved2=0; d' !]ZWe
bfh.bfType=((WORD)('M'<< 8)|'B'); RIlwdt
bfh.bfSize=54+size; ]~9tYn
bfh.bfOffBits=54; ZGexdc%
CFile bf; (?n=33}Ci
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8EW_V$>R
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); f.D?sH An
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); MqW7cjg
bf.WriteHuge(lpData,size); n6wV.?8
bf.Close(); \y97W&AN
nCount++; "|EM;o
} /sx@$cvW
GlobalFreePtr(lpData); JZ)RGSG i
if(nCount==1) KI)M JG:t
m_Number.Format("%d picture captured.",nCount); 00(on28b
else 7?#J~.d5
m_Number.Format("%d pictures captured.",nCount); 5x5@t
:
UpdateData(FALSE); #eoome2Q
} ]O]4z,n
Px4)>/ z,
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) i6^twK)j
{ `g(Y*uCp
if(pMsg -> message == WM_KEYDOWN) U;YC}r
{
[$mHv,~
if(pMsg -> wParam == VK_ESCAPE) /KFfU1
return TRUE; VLOO8N[o
if(pMsg -> wParam == VK_RETURN) <^VJy5>
return TRUE; gqZ'$7So
} F^WP <0C
return CDialog::PreTranslateMessage(pMsg); B^1>PE
} Vx$ \hcG
WJQvB=D&
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) K18}W*$
d
{ bWH&P/>
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ C6VLy x
SaveBmp(); 6c}h(TkB
return FALSE; "H7dft/
} ,BH@j%Jmy
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ z6U\axO6
CMenu pop; IbT=8l,Li
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); s]HOGJJz
CMenu*pMenu=pop.GetSubMenu(0); P@Hs`=
pMenu->SetDefaultItem(ID_EXITICON); w^Sz#_2
CPoint pt; CNih6R
GetCursorPos(&pt); U_Vs.M.p
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `tBgH_$M
if(id==ID_EXITICON) O9G[j=U
DeleteIcon(); @Pm>sY}d<I
else if(id==ID_EXIT) O8+7g+J=!
OnCancel(); ap.K=-H
return FALSE; b LB:MW\%
} vUN22;Z\
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %P<hW+P!
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) p)jk>j B
AddIcon(); rV2WnAb[H&
return res; -z-C*%~
} *F+KqZ.2
)P%ZA)l%_o
void CCaptureDlg::AddIcon() lG9bLiFY
{ eX?OYDDC0j
NOTIFYICONDATA data; xqeyD* s
data.cbSize=sizeof(NOTIFYICONDATA); 02f~En}>6
CString tip; 4QH3fTv
tip.LoadString(IDS_ICONTIP); _>5(iDW0
data.hIcon=GetIcon(0); Vp#JS3Y
data.hWnd=GetSafeHwnd(); E-4b[xNj*+
strcpy(data.szTip,tip); 6hw=
data.uCallbackMessage=IDM_SHELL; |ax3sAg
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Ghu#XJB?
data.uID=98; h`]Iy
Shell_NotifyIcon(NIM_ADD,&data); \RNNg
ShowWindow(SW_HIDE); YpWPz %`:
bTray=TRUE; ]GMe\n
} jfP*"uUK
rxe>}ZO
void CCaptureDlg::DeleteIcon() aI%g2q0f
{ 9eGyyZg
NOTIFYICONDATA data; 4qO+_!x{)
data.cbSize=sizeof(NOTIFYICONDATA); 6w*dKInG[-
data.hWnd=GetSafeHwnd(); x/NfZ5e0X
data.uID=98; QCD.YFM
Shell_NotifyIcon(NIM_DELETE,&data); EOIN^4V"
ShowWindow(SW_SHOW); cbNTj$'b2u
SetForegroundWindow(); F5LuSy+v
ShowWindow(SW_SHOWNORMAL); fX(3H1$"
bTray=FALSE; {'NZ.
} ls_'')yp
O_2pIbh
void CCaptureDlg::OnChange() BHIRHmM<Y
{ Lco~,OE
RegisterHotkey(); ~d
o9;8v
} SAH-p*.
c-x,fS"&W
BOOL CCaptureDlg::RegisterHotkey() 61,;Uc\T
{ ?274uAO'
UpdateData(); ]jtK I4
UCHAR mask=0; J}*,HT *
UCHAR key=0; e{h<g>7
if(m_bControl) +@A
mask|=4; Rvkedb
if(m_bAlt) ^T( .k=
mask|=2; T%x}Y#U'`
if(m_bShift) |Z|-q"Rf
mask|=1; }v@dL3{f
key=Key_Table[m_Key.GetCurSel()]; T] R|qlZ
if(bRegistered){ 5/q}`T9i%7
DeleteHotkey(GetSafeHwnd(),cKey,cMask); c CSs
bRegistered=FALSE; 5Iy|BRU(%
} 2n,*Nd`
cMask=mask; ~De"?
cKey=key; +s"hqm
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,QOG!T4
return bRegistered; +cD<:"L'g
} r [9x
.4_o>D
四、小结 A|CmlAW~^
*]. 7dec/
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。