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:
jlV~-}QKb7
w`(EW>i 一、实现方法
Y|t] bb N@$g"w 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:
NGD?.^ (G ~VZ)LQ'7 #pragma data_seg("shareddata")
~yH<,e HHOOK hHook =NULL; //钩子句柄
}ZMbTsm UINT nHookCount =0; //挂接的程序数目
/ vI sX3v static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
?\dY! static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
+'9l 2DI; static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Hmt}@ static int KeyCount =0;
w /$4
Rv+S static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
U^trZ]) #pragma data_seg()
!Pf_he SomA`y+ERn 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。
G992{B CA7 ZoMB# 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:
*/iD68r|- 3 8>?Z]V BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
q-%;~LF cKey,UCHAR cMask)
$;1#gq% {
v\>!J? BOOL bAdded=FALSE;
?mxBMtc
for(int index=0;index<MAX_KEY;index++){
29DYL if(hCallWnd[index]==0){
zKr\S|yE hCallWnd[index]=hWnd;
~y.{WuUD HotKey[index]=cKey;
rPoPs@CBD HotKeyMask[index]=cMask;
F-?K]t# bAdded=TRUE;
7e\g KeyCount++;
C~PrIM? break;
-1Acprr }
V!#+Ti/w4 }
~Zbr7zVn return bAdded;
1Wd?AyTY, }
L&O!"[++ //删除热键
6/^$SWd2 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
S'>(4a {
.LDK+c BOOL bRemoved=FALSE;
h2g|D(u) for(int index=0;index<MAX_KEY;index++){
H!Gsu$C if(hCallWnd[index]==hWnd){
lub(chCE[ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
ZS0=xS5q) hCallWnd[index]=NULL;
DIR_W-z HotKey[index]=0;
Jh2eo+/% HotKeyMask[index]=0;
1&A@Zo5| bRemoved=TRUE;
T
9Jv KeyCount--;
h|h-< G?> break;
T|o[! @:, }
[MfKBlA }
0j*-ZvE)30 }
]O'dwC return bRemoved;
@vWf-\ }
0PIiG-o9 //63?s+ b0
))->&2 DLL中的钩子函数如下:
E)liuu!qI 5MsE oLg LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
7Io]2)V {
AfmGA9 BOOL bProcessed=FALSE;
C2RR(n=N^ if(HC_ACTION==nCode)
yi`Z(j; {
EsR_J/:Qe if((lParam&0xc0000000)==0xc0000000){// 有键松开
N yT|=`; switch(wParam)
EU?)AxH^ {
j)IXe 0dMC case VK_MENU:
:A%|'HxH3 MaskBits&=~ALTBIT;
Sc
Uh
-y_ break;
LX{[9 case VK_CONTROL:
KLpu7D5(| MaskBits&=~CTRLBIT;
]O
Nf;RH break;
X;JptF^ case VK_SHIFT:
p9]008C89 MaskBits&=~SHIFTBIT;
?c712a ? break;
D 3m4:z default: //judge the key and send message
]k~k6#),; break;
rjzRZ }
4$Oakl*l for(int index=0;index<MAX_KEY;index++){
t,$4J6 if(hCallWnd[index]==NULL)
nb}* IExd continue;
f\+MnZ4[Qj if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*,g|I8?%VD {
FoY_5/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
K3jKOV8 bProcessed=TRUE;
ER0nrTlB< }
4QbD DvRQ^ }
yRt]i> }
39| W(, else if((lParam&0xc000ffff)==1){ //有键按下
0ut/ ')[ switch(wParam)
YCvIB' {
*Dx&} " case VK_MENU:
A:$Qt%c MaskBits|=ALTBIT;
pv<$
o break;
;Z]i$Vi_r case VK_CONTROL:
LQT^1|nq MaskBits|=CTRLBIT;
dh r)ra] break;
vR$[#`X case VK_SHIFT:
3!_X FV MaskBits|=SHIFTBIT;
9PXG*r|D break;
y8"8QH default: //judge the key and send message
b77Iw%x7 break;
c#'t][Ii }
px6[1'|g for(int index=0;index<MAX_KEY;index++){
0XV8B if(hCallWnd[index]==NULL)
(]*
Ro 8 continue;
olc7&R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
LIfQh {
.U.Knn SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
?.1yNO*s bProcessed=TRUE;
_*\:UBZx6 }
Zpfsh2` }
;Fw{p{7< }
pVgzUu7 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
]%AmX-U for(int index=0;index<MAX_KEY;index++){
3[mVPV if(hCallWnd[index]==NULL)
JC|j*x(k/ continue;
xUT]6T0dB if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
>bQ'*! SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
OV<'v%_& //lParam的意义可看MSDN中WM_KEYDOWN部分
MTm}qx@L }
z%ZAN- }
#.1+-^TQk }
YN.[KQ(! return CallNextHookEx( hHook, nCode, wParam, lParam );
~z;G$jd }
L1P.@hJ {D6lSj 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
tzH~[n, N %;bV@A9 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
^FO&GM2a BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
0\W6X;? 90Rz#qrI* 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
IIj
:\?r h=<x%sie LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
FU]jI[ {
6uNWL `v if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
eK8y'VY {
,2yIKPWk //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
_JEe] SaveBmp();
~w
Ekbq= return FALSE;
r.WQ6h/eZ5 }
n-djAhy …… //其它处理及默认处理
`MD%VHQ9U }
a]=k-Xh aK|],L B EN
U 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
wk+| }s 0j\} @ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
T?lp:~d j Wpm"C
二、编程步骤
Ms>CO7Nvy ?WEKRl 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
eDkJ+5b JE~;gz] 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
ZovF]jf k }Od=WQv+ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
\+iZdZD y=HM]EH> 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
5MX7V4ist p;xMudM 5、 添加代码,编译运行程序。
K=K]R01/o jNbU{Z%r 三、程序代码
&x"hM Xd 5 vNmQn ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
kac-@ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
;{j@ia #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
As>-9p>v #if _MSC_VER > 1000
JHJIjYG>P #pragma once
P*!~Z*" #endif // _MSC_VER > 1000
HrK7qLw7 #ifndef __AFXWIN_H__
PP{s&( #error include 'stdafx.h' before including this file for PCH
j=kz^o~mH #endif
4R}$P1 E #include "resource.h" // main symbols
#&sw%CD class CHookApp : public CWinApp
$?*XPzZ {
/A82~ public:
8+mu'RZ X CHookApp();
q,>-4Cm // Overrides
AMe_D // ClassWizard generated virtual function overrides
ecdM+kP //{{AFX_VIRTUAL(CHookApp)
9i`MUE1Sh public:
cv7.=*Kb; virtual BOOL InitInstance();
gR76g4|=; virtual int ExitInstance();
"ivSpec.V //}}AFX_VIRTUAL
|'QgL0?
//{{AFX_MSG(CHookApp)
GhC%32F // NOTE - the ClassWizard will add and remove member functions here.
p?,T%G+gqO // DO NOT EDIT what you see in these blocks of generated code !
0RF<:9@x2 //}}AFX_MSG
L"It0C DECLARE_MESSAGE_MAP()
9jJ:T$} };
rd ]dDG LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
c:u2a/Q? BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
-(VX+XHW BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
l<UJ@XID$ BOOL InitHotkey();
9xRor< BOOL UnInit();
rPx:o}&< #endif
XQStlUw8+ ? oQ_qleuo //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
0czEA #include "stdafx.h"
9RQw6rL #include "hook.h"
nC@UK{tVa #include <windowsx.h>
U&OE*dq #ifdef _DEBUG
P~@.(hed #define new DEBUG_NEW
IJ2>\bW_p #undef THIS_FILE
dk.VH!uVb static char THIS_FILE[] = __FILE__;
[J6q(}f #endif
aMO+y91Y( #define MAX_KEY 100
:rnj>U6<> #define CTRLBIT 0x04
wh#x`Nc #define ALTBIT 0x02
icXeB_&cS #define SHIFTBIT 0x01
6B&ERdoX #pragma data_seg("shareddata")
Nrfj[I HHOOK hHook =NULL;
3.V-r59 UINT nHookCount =0;
T?EFY}f static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Vbp`Rm1? static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
*6QmYq6c< static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
xf4`+[ static int KeyCount =0;
1J[|Ow static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Z:Nm9m #pragma data_seg()
5tcJTz HINSTANCE hins;
. *c%A^> void VerifyWindow();
-n]E\" BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
(6~~e$j //{{AFX_MSG_MAP(CHookApp)
S1E=EVG // NOTE - the ClassWizard will add and remove mapping macros here.
(db4.G+0 // DO NOT EDIT what you see in these blocks of generated code!
?vocI //}}AFX_MSG_MAP
Sj9NhtF]f END_MESSAGE_MAP()
1ZRSeh g/jlG%kI} CHookApp::CHookApp()
PXDwTuyc {
t.6gyrV7>< // TODO: add construction code here,
4<l&cP // Place all significant initialization in InitInstance
Q2RO&dL
9 }
[LrA_N
FA#8 CHookApp theApp;
zR6^rq* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@Yzc?+x {
(VH0+ BOOL bProcessed=FALSE;
a!*K)x,"< if(HC_ACTION==nCode)
U(u$5 {
_do(
if((lParam&0xc0000000)==0xc0000000){// Key up
#`b5kqQm switch(wParam)
8VLD yX2- {
wwh)B92Y5 case VK_MENU:
@Sd l~'" MaskBits&=~ALTBIT;
Fc.1)yh. break;
mZb[Fi case VK_CONTROL:
)\|Bghui MaskBits&=~CTRLBIT;
E-XFW]I break;
J<=k
[Q case VK_SHIFT:
)kuw&SH, MaskBits&=~SHIFTBIT;
kK il]L break;
U8s&5~IPn default: //judge the key and send message
6<+ 8[o break;
$ H2HVJ }
Mg}8 3kS for(int index=0;index<MAX_KEY;index++){
(v$$`zh if(hCallWnd[index]==NULL)
v|K<3@J continue;
2$%E:J+2:$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
PTFe>~vr* {
+\@WOs SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
sPUn"7 bProcessed=TRUE;
K^fH:pV }
+7|Q d}\X }
SFRQpQ06 }
PDH00(#;+ else if((lParam&0xc000ffff)==1){ //Key down
"f-z3kL switch(wParam)
6pi^ rpo {
-)2sR>`A% case VK_MENU:
A3=$I&!% MaskBits|=ALTBIT;
1L:sck5k break;
q*B(ZG case VK_CONTROL:
tW#=St0<.o MaskBits|=CTRLBIT;
M,j3 z# break;
U*7Yi-"/* case VK_SHIFT:
WPzq?yK MaskBits|=SHIFTBIT;
7)y9%-} break;
"Ooc;xD3< default: //judge the key and send message
pHkhs{/X break;
eaGd:( }
XK7$Xbd for(int index=0;index<MAX_KEY;index++)
m:A1wL4c6
{
V=LJ_T"z0 if(hCallWnd[index]==NULL)
hRWRXC9 continue;
b08s610fk if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
js#72T/_n {
uqMe% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
a6&+>\o bProcessed=TRUE;
#lHA<jI }
-B l!s^-' }
O5?Gv??@ }
k_}aiHdG if(!bProcessed){
w2/3\3p for(int index=0;index<MAX_KEY;index++){
u:FFZ if(hCallWnd[index]==NULL)
[V-OYjPAx continue;
t/4&=]n\u if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
' QrvkQ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
1VD8y_tC }
ZLRAiL }
R^*h|7)E }
h*JzJ0X return CallNextHookEx( hHook, nCode, wParam, lParam );
z#!}4@_i3 }
n)'5h #~Z55D_ BOOL InitHotkey()
D'!
v9} {
q0l=S+0 if(hHook!=NULL){
P}kp_l27 nHookCount++;
/QeJ#EHn return TRUE;
7Ib/Cm0d| }
]$VYzE2e else
1sT%g}w@| hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
]tzO)c)w; if(hHook!=NULL)
} 9qbF+b nHookCount++;
4CT _MAj return (hHook!=NULL);
3i c6!T#t" }
nbGB84 BOOL UnInit()
{ eU_ {
0gEtEH+ if(nHookCount>1){
M,ObzgW nHookCount--;
5:o$]LkOWC return TRUE;
O"<W<l7Q }
[=
GVK BOOL unhooked = UnhookWindowsHookEx(hHook);
JFvVRGWB if(unhooked==TRUE){
ia!b0*< nHookCount=0;
Imi#$bF6 hHook=NULL;
mF?GQls` }
b"t<B2N return unhooked;
c)HHc0KD }
Ev R6^n/ R>ak 3Y BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
GomTec9. {
):Vzv BOOL bAdded=FALSE;
"0nT:!BZ for(int index=0;index<MAX_KEY;index++){
U%7| iK if(hCallWnd[index]==0){
H.D1|sU hCallWnd[index]=hWnd;
!&3iZQGWv HotKey[index]=cKey;
"K"]/3`k- HotKeyMask[index]=cMask;
lDQ' bAdded=TRUE;
>|"mhNF KeyCount++;
x
tJ_azt break;
scffWqEo }
:< )"G& }
wClX3l>y return bAdded;
g `)5g5 }
fY|Bc<,V9) =*AAXNs@3 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~4YLPMGKl {
|HjoaN ) BOOL bRemoved=FALSE;
=9lrPQ]w for(int index=0;index<MAX_KEY;index++){
3c"$@W:> if(hCallWnd[index]==hWnd){
5&y;r if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Y=%SK8]Q; hCallWnd[index]=NULL;
"w)Y0Qq*z HotKey[index]=0;
tA?cHDp4E HotKeyMask[index]=0;
\WDL?(G< bRemoved=TRUE;
_?vh#6F KeyCount--;
hdw-ge m{? break;
WMo }
4>uy+"8PO }
BVKr 2v }
.%.kEJh` return bRemoved;
GAZTCkB" }
Zy}Qc")Z LP{{PT.&X void VerifyWindow()
K+0&~XU {
^J?ExMu for(int i=0;i<MAX_KEY;i++){
%uuh+@/&yz if(hCallWnd
!=NULL){ (1
"unP-
if(!IsWindow(hCallWnd)){ lZY0A#
hCallWnd=NULL; fpjy[$8
HotKey=0; x>>#<hOz[
HotKeyMask=0; [j6EzMN
KeyCount--; fn%Gu s~
} pjC2jlwm*
} 02Ftn&bi
} Dq#/Uw#
} Qy)+YhE
dLtSa\2Hn
BOOL CHookApp::InitInstance() z7[TgL7
{ egBjr?
AFX_MANAGE_STATE(AfxGetStaticModuleState()); z (N3oBW
hins=AfxGetInstanceHandle(); j\^0BTZ
InitHotkey();
T 4}SF
return CWinApp::InitInstance(); t/;@~jfr@
} [DW}z
}Pm>mQZ},
int CHookApp::ExitInstance() U($sH9,
{ +N161vo7
VerifyWindow(); $jt UQ1
UnInit(); p^2"g~
return CWinApp::ExitInstance(); :ZP4(}
} 81\$X
f@ &?K<
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Bg^k~NX%
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .g CC$
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #n= b*.
#if _MSC_VER > 1000 ~~U2Sr
#pragma once Hx}K
wS
#endif // _MSC_VER > 1000 -1tdyCez
CgLS2
class CCaptureDlg : public CDialog n-h2SQl!
{ (BtavE
// Construction 4dDDi,)U
public: /Q7cQ2[EU
BOOL bTray; us&!%`
BOOL bRegistered; KFCL|9P
BOOL RegisterHotkey(); gTI!b
UCHAR cKey; ~Rzn =>a
UCHAR cMask; 9/lCW
void DeleteIcon(); &G5=?ub
void AddIcon(); ,hj5.;M
UINT nCount; zNE"5
void SaveBmp(); 5XO eYO{
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^ <Z^3c>/
// Dialog Data )"
H$1
//{{AFX_DATA(CCaptureDlg) s*R\!L
enum { IDD = IDD_CAPTURE_DIALOG }; KtWG2
CComboBox m_Key; P#o/S4
BOOL m_bControl; qp(F}@
BOOL m_bAlt; By=/DVm)=
BOOL m_bShift; [\o+I:,}wi
CString m_Path; I0 y+,~\
CString m_Number; )oO cV%
//}}AFX_DATA \Vis
// ClassWizard generated virtual function overrides K\ww,S
//{{AFX_VIRTUAL(CCaptureDlg) (wmMHo|
public: "7R"(.~>
virtual BOOL PreTranslateMessage(MSG* pMsg); RU!j"T
5
protected: 2[&3$-]
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support z/*nY?
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }i1p&EN^
//}}AFX_VIRTUAL (7RxCo=X
// Implementation 8?S32Gdu
protected: ^'S0A=1
HICON m_hIcon; GS |sx
// Generated message map functions q#W|*kL3
//{{AFX_MSG(CCaptureDlg) [@ ]f@Wd
virtual BOOL OnInitDialog(); n{F$,a
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !1f8~"Z
afx_msg void OnPaint(); 7%Zl^c>q
afx_msg HCURSOR OnQueryDragIcon(); ![WX -"lW
virtual void OnCancel(); DpIv <m]
afx_msg void OnAbout(); bWv4'Y!p
afx_msg void OnBrowse(); I__|+%oC
afx_msg void OnChange(); v}hmI']yf
//}}AFX_MSG yp=Hxf
DECLARE_MESSAGE_MAP() lkf(t&vL2
}; ]%I cUd}
#endif UhCE.#
U
i<|5~tm
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :.['e`
#include "stdafx.h" 2=X 2M
#include "Capture.h" ]!J 6S.@#+
#include "CaptureDlg.h" _Zya GDv
#include <windowsx.h> EWPP&(u3
#pragma comment(lib,"hook.lib") O=}4?Xv
#ifdef _DEBUG oxE'u<
#define new DEBUG_NEW A87JPX#R?
#undef THIS_FILE SU OuayE
static char THIS_FILE[] = __FILE__; ((A]FOIbO
#endif 0es[!
#define IDM_SHELL WM_USER+1 ~lMw*Qw^
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J#B%
#X
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5Qhu5~,K
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *vFVXJo
class CAboutDlg : public CDialog h+Km |
{ 0!F"s>(H
public: brJ_q0@
CAboutDlg(); t4pc2b
// Dialog Data FX7=81**4
//{{AFX_DATA(CAboutDlg) T;jp2 #
enum { IDD = IDD_ABOUTBOX }; Pl<r*d)h
//}}AFX_DATA D/jB.
// ClassWizard generated virtual function overrides 78>)<$+d
//{{AFX_VIRTUAL(CAboutDlg) KE:PRX
protected: jr{C/B}
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D8N}*4S
//}}AFX_VIRTUAL \]}|m<R
// Implementation ,wE]:|`qJ
protected: Mk"+*G
//{{AFX_MSG(CAboutDlg) 6lO]V=+
//}}AFX_MSG ^Bn)a"Gd
DECLARE_MESSAGE_MAP() %o9@[o
.]
}; B7(~m8:eH7
9tsI1]1[m
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) <y=VDb/
{ 8*3o9$Pj
//{{AFX_DATA_INIT(CAboutDlg) b'Qia'a%
//}}AFX_DATA_INIT :S}!i?n
} c4ptY5R),
s42M[BW]
void CAboutDlg::DoDataExchange(CDataExchange* pDX) F<q'ivj:w
{ n"8vlNeW
CDialog::DoDataExchange(pDX); ES!$JWK|
//{{AFX_DATA_MAP(CAboutDlg) 3^
~M7=k
//}}AFX_DATA_MAP r#iZ FL3q
} tGnBx)J|
>_P7 k5Y^
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }#'wy
//{{AFX_MSG_MAP(CAboutDlg) ^I03PIy0l
// No message handlers w2!G"oD
//}}AFX_MSG_MAP M*FUtu
END_MESSAGE_MAP() $X8(OS5d'
z+I'N4*^
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,gGIkl&
: CDialog(CCaptureDlg::IDD, pParent) 1oD,E!+^d
{ C,7d
//{{AFX_DATA_INIT(CCaptureDlg) qp_lMz
m_bControl = FALSE; vN:gu\^-
m_bAlt = FALSE; =!T@'P?
m_bShift = FALSE; 2^w3xL"
m_Path = _T("c:\\"); I|69|^
m_Number = _T("0 picture captured."); OV3l)73?t
nCount=0; ,?k[<C
bRegistered=FALSE; %jz]s4u$5j
bTray=FALSE; P8!ON=
//}}AFX_DATA_INIT c* 2U'A
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $U%M]_
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); _+PiaJ&'
} 6 "fYSn>
C'&)""3d
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) c'cK+32
{ }5c%v1
CDialog::DoDataExchange(pDX); %B?@le+%
//{{AFX_DATA_MAP(CCaptureDlg) zQ3m@x
DDX_Control(pDX, IDC_KEY, m_Key); `)V1GR2
ES
DDX_Check(pDX, IDC_CONTROL, m_bControl); a (AKVk\
DDX_Check(pDX, IDC_ALT, m_bAlt); |,3s]b`
DDX_Check(pDX, IDC_SHIFT, m_bShift); n^aSio6
DDX_Text(pDX, IDC_PATH, m_Path); U-Ia$b-5!
DDX_Text(pDX, IDC_NUMBER, m_Number); J1OZG6|e
//}}AFX_DATA_MAP G8=2=/ !
} S3#NGBZ/
)_bc:6Q
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Zjis0a]v~k
//{{AFX_MSG_MAP(CCaptureDlg) (:9yeP1
ON_WM_SYSCOMMAND() k(LZ,WSR
ON_WM_PAINT() HJ#3wk "W
ON_WM_QUERYDRAGICON() <xpOi&l
ON_BN_CLICKED(ID_ABOUT, OnAbout) R_9 &V!fl
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) S(NH# ^
ON_BN_CLICKED(ID_CHANGE, OnChange) tLCu7%P>
//}}AFX_MSG_MAP O~
a`T
END_MESSAGE_MAP() dA,irb I0W
+65OR'd
BOOL CCaptureDlg::OnInitDialog() s*'L^>iZ
{ R%gkRx[
CDialog::OnInitDialog(); XKp$v']u
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); E`E$ }iLs
ASSERT(IDM_ABOUTBOX < 0xF000); bBx.snBK
CMenu* pSysMenu = GetSystemMenu(FALSE); b:%z<vo
if (pSysMenu != NULL) Wp2W:JX:
{ @|I:A
CString strAboutMenu; R$>]7-N}
strAboutMenu.LoadString(IDS_ABOUTBOX); @ P:b\WCI
if (!strAboutMenu.IsEmpty()) bx!uHL=
{ 4Vv~
pSysMenu->AppendMenu(MF_SEPARATOR); u_kcuN\Sq
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); K)-Gv|*t
} OGl>i
} M't~/&D#
SetIcon(m_hIcon, TRUE); // Set big icon |X}H&wBWo
SetIcon(m_hIcon, FALSE); // Set small icon j[E8C$lW
m_Key.SetCurSel(0); GUX!kj
RegisterHotkey(); Gp 8%n
CMenu* pMenu=GetSystemMenu(FALSE);
ywQ>T+
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); iJ8 5okv'
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8PN/*Sa
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0P MF)';R
return TRUE; // return TRUE unless you set the focus to a control O
&/9wi>!q
} L&D+0p^lI
yQP!Vt^
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Vgh;w-a
{ Z)JJ-V!
if ((nID & 0xFFF0) == IDM_ABOUTBOX) B: '}SA{
{ 6CQ.>M:R
CAboutDlg dlgAbout; $5(_U
dlgAbout.DoModal(); 2X];zY
} 2/*F}w/
else w)Rtt 9
{ |_<'qh
CDialog::OnSysCommand(nID, lParam); d3nx"=Cy0I
} q,e{t#t
} n jfh4}g:
y#Cp Vm#!>
void CCaptureDlg::OnPaint() UJ\[^/t
{ %_kXC~hH_
if (IsIconic()) j|6@>T1
{ 6}V)\"u&
CPaintDC dc(this); // device context for painting 4=;.<
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4jWzYuI&J
// Center icon in client rectangle s=[Tm}[
int cxIcon = GetSystemMetrics(SM_CXICON); "ITC P<+
int cyIcon = GetSystemMetrics(SM_CYICON); ~ RdD6V
CRect rect; '7'*+sgi$
GetClientRect(&rect); Mx-? &
int x = (rect.Width() - cxIcon + 1) / 2; %1Ex{H hb
int y = (rect.Height() - cyIcon + 1) / 2; L&gC
// Draw the icon NZu\ Ae
dc.DrawIcon(x, y, m_hIcon); dwH8Zg$B
} T9s$IS ,
else P M
x`PB
{ d65fkz==A)
CDialog::OnPaint(); 8vk*",
} fX:)mLnO/
} mYU7b8x_
asT/hsSNS
HCURSOR CCaptureDlg::OnQueryDragIcon() {2A| F{7>
{ Vxr_2Kra
return (HCURSOR) m_hIcon; $ 8"we
} a\K__NCrX
jY~W*
void CCaptureDlg::OnCancel() |JUb 1|gi
{ :Dh\
if(bTray) 7o+JQ&fF;
DeleteIcon(); ;~A-32;Y4
CDialog::OnCancel(); Fwu:x.(
} FW~{io]n
.Mn_T*F
void CCaptureDlg::OnAbout() z~O#0Q!
{ DH@]d0N
CAboutDlg dlg; O^Y}fo'
dlg.DoModal(); F!>92H~3G
} 5l(8{,NDt
k$ya.b<X/
void CCaptureDlg::OnBrowse() }3b3^f
{ b I%Sq+"}
CString str; s8r|48I#;
BROWSEINFO bi; G{ |0}
char name[MAX_PATH]; *A^j>lV
ZeroMemory(&bi,sizeof(BROWSEINFO)); i 4}4U
bi.hwndOwner=GetSafeHwnd(); [!g$|
bi.pszDisplayName=name; iXF iFsb
bi.lpszTitle="Select folder"; z:
;ZPSn
bi.ulFlags=BIF_RETURNONLYFSDIRS; &Zzd6[G+
LPITEMIDLIST idl=SHBrowseForFolder(&bi); +vDEDOS1
if(idl==NULL) 46yq F
return; )s#NQ.T[
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); k;7R3O@
str.ReleaseBuffer(); _v[yY3=3
m_Path=str; ~o<+tL
if(str.GetAt(str.GetLength()-1)!='\\') t PJW|wo
m_Path+="\\"; H3}eFl=i2
UpdateData(FALSE); hJ)\Vo
} a>05Yxw
:
\{>+!`w
void CCaptureDlg::SaveBmp() =7e|e6
{ 4 !q4WQ ;
CDC dc; Y=NXfTc
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;Dw6pmZ
CBitmap bm; b}f#[* Z
int Width=GetSystemMetrics(SM_CXSCREEN); k@[P\(a3b
int Height=GetSystemMetrics(SM_CYSCREEN); *X_-8 ^~
bm.CreateCompatibleBitmap(&dc,Width,Height); -(Zi
CDC tdc; M0B6v}^H
tdc.CreateCompatibleDC(&dc); ?k 4|;DD
CBitmap*pOld=tdc.SelectObject(&bm); V(?PKb-w)
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?Z1&ju,Hd-
tdc.SelectObject(pOld); ,mHQ
BITMAP btm; vqeWt[W
v
bm.GetBitmap(&btm); XEUy,>mR
DWORD size=btm.bmWidthBytes*btm.bmHeight; S-5|t]LV
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $ ]fautQlt
BITMAPINFOHEADER bih; wU"0@^k]<
bih.biBitCount=btm.bmBitsPixel; k2-:!IE
bih.biClrImportant=0; FFG/v`NM
bih.biClrUsed=0; L[j73z'
bih.biCompression=0; ,/bSa/x`
bih.biHeight=btm.bmHeight; bG|aQ2HW
bih.biPlanes=1; odPdWV,&*
bih.biSize=sizeof(BITMAPINFOHEADER); ZH1W#dt`[
bih.biSizeImage=size; 3iKy>
bih.biWidth=btm.bmWidth; \ZOH3`vq
bih.biXPelsPerMeter=0; lDWg%pI+
bih.biYPelsPerMeter=0; G
$F3dx.I
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); San=E@3}v!
static int filecount=0; sC<
B
CString name; }C'H@:/
name.Format("pict%04d.bmp",filecount++); yF _@^V
name=m_Path+name; C.#\Pz0
BITMAPFILEHEADER bfh; US.7:S-r"
bfh.bfReserved1=bfh.bfReserved2=0; q^I/
bfh.bfType=((WORD)('M'<< 8)|'B');
=JR6-A1>
bfh.bfSize=54+size; 5PRS|R7
bfh.bfOffBits=54; *l-f">?|
CFile bf; l>kREfHq!{
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ v/s6!3pnl
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); i3SrsVSG
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); fOHgz,x=
bf.WriteHuge(lpData,size); 2omKP,9,2
bf.Close(); AB:JXMyK
nCount++; MS=zG53y
} O'WBO"
GlobalFreePtr(lpData); y8!#G-d5
if(nCount==1) lQq&tz,
m_Number.Format("%d picture captured.",nCount); Eq\PSa=gz
else $;V?xZm[
m_Number.Format("%d pictures captured.",nCount); zxo"
+j4Ym
UpdateData(FALSE); +n>_NVe
} !D \u2h
K:cZq3F
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [bK5q;#U4
{ hi.`O+;
if(pMsg -> message == WM_KEYDOWN) fDzG5}i
{ 'f
"KV|
if(pMsg -> wParam == VK_ESCAPE) !EuqJjh
return TRUE; 8NUVHcB6
if(pMsg -> wParam == VK_RETURN) K8R}2K-Y
return TRUE; !Z}d^$
} CI}zu;4|
return CDialog::PreTranslateMessage(pMsg); 4H]~ ]?F&
} Nr(t5TP^
YWK|AT-4
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2X)n.%4g$;
{ 2BGS$$pP
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?6#F9\
SaveBmp(); ~CRd0T[^
return FALSE; PL}c1Ud
} W74Y.zQ
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ C-:lM1
CMenu pop; HO`N]AMw
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); CC~:z/4,N
CMenu*pMenu=pop.GetSubMenu(0); wr~Ydmsf
pMenu->SetDefaultItem(ID_EXITICON); *?o`90HHP[
CPoint pt; LT2UY*
GetCursorPos(&pt); FD*)@4<o
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); K!cLEG!G
if(id==ID_EXITICON) K8?]&.!
DeleteIcon(); b<]Ae!I'
else if(id==ID_EXIT) )[]*Y]vSx
OnCancel(); `alQmGUZ
return FALSE; ..=WG@>$+
} c(j|xQ\pE
LRESULT res= CDialog::WindowProc(message, wParam, lParam); d8p<f+
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6`JY:~V"
AddIcon(); Ob~7r*q
return res; bZKlQ<sI
} 6]D%|R,Q#}
h@H8oZ[
void CCaptureDlg::AddIcon() |RS(QU<QE
{ \Aa{]t
NOTIFYICONDATA data; )/vse5EG+
data.cbSize=sizeof(NOTIFYICONDATA); e%wzcn
CString tip; ;&2f {
tip.LoadString(IDS_ICONTIP); &$V&gAN
data.hIcon=GetIcon(0); ;J&p17~T9
data.hWnd=GetSafeHwnd(); (]}52%~
strcpy(data.szTip,tip); v|K'M,E
data.uCallbackMessage=IDM_SHELL; 5Kw$QJ/
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /9 ^F_2'_
data.uID=98; S5(VdMd"^
Shell_NotifyIcon(NIM_ADD,&data); iKVJ
c=C
ShowWindow(SW_HIDE); t~0!K;nn
bTray=TRUE;
<}
BuU!
} k7cM.<s!
Zai:?%^
void CCaptureDlg::DeleteIcon() Gp.XTz#=
{ x,rK4L7U
NOTIFYICONDATA data; t)__J\xF
data.cbSize=sizeof(NOTIFYICONDATA); Ui43 &B
data.hWnd=GetSafeHwnd(); {S6:LsFfm
data.uID=98; 4b/>ZHFOF;
Shell_NotifyIcon(NIM_DELETE,&data); m.g2>r`NU
ShowWindow(SW_SHOW); [(kC/W)!
SetForegroundWindow(); QrSF1y'd
ShowWindow(SW_SHOWNORMAL); ,|lDR@
bTray=FALSE;
a^5.gfzA
} pG-9H3[f#
/T\'&s3D+
void CCaptureDlg::OnChange() .VG5 / 6zp
{ _t7}ny[
RegisterHotkey(); sWKe5@-o0
} eJ"je@vvrK
f[s|<U^
BOOL CCaptureDlg::RegisterHotkey() n8RE
{ a@v}j&
UpdateData();
O>tz;RU
UCHAR mask=0; ,"xr^@W
UCHAR key=0; )xxpO$
if(m_bControl) \ y}!yrQ
mask|=4; _+*+,Vx
if(m_bAlt) vP.^j7wB
mask|=2; M8y:FDX
if(m_bShift) 7ZR0cJw;
mask|=1; P~^VLnw
key=Key_Table[m_Key.GetCurSel()]; Iss)7I
if(bRegistered){ TRJ5m?x
DeleteHotkey(GetSafeHwnd(),cKey,cMask); H)rE-7(f!
bRegistered=FALSE; 9,J^tN@^
} 0YA
cMask=mask; Po*G/RKu4W
cKey=key; ??
2x* l1
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ZT
d)4f
return bRegistered; b uOpHQn
} *Ud=x^JxO
UfxYD
四、小结 !+H)N
>X58 zlxk
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。