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:
({62GWnn_
_C\
d^a( 一、实现方法
4y)1*V U: jh!IOtf 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:
nr%^:u ,$*klod #pragma data_seg("shareddata")
o{,(`o.1O HHOOK hHook =NULL; //钩子句柄
438>)= UINT nHookCount =0; //挂接的程序数目
_e^V\O> static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
C'"6@-~ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
;L{y3CWT static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
$9b6,Y_- static int KeyCount =0;
e
q.aN3KB" static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
$O>MV #pragma data_seg()
k.hSN8 3Sb%]f5( 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。
r!=VV!XZ g9`ytWmM 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:
gC:E38u 5Ww\h BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
7}?z=LHb3 cKey,UCHAR cMask)
s7gf7E#Y {
6H9]]Unju BOOL bAdded=FALSE;
[IW7]Fv<F for(int index=0;index<MAX_KEY;index++){
dv>zK#! if(hCallWnd[index]==0){
}6(:OB? hCallWnd[index]=hWnd;
1&WFs6 HotKey[index]=cKey;
A~t7I{` HotKeyMask[index]=cMask;
*gKr1}M bAdded=TRUE;
pEP.^[ KeyCount++;
ucO]&'hu: break;
;<Q_4
V }
@J)vuGS }
&0blHDMj{# return bAdded;
`fHiY.- }
:"^$7 //删除热键
|8rJqtf +& BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Y`Rf E {
W12K93tO BOOL bRemoved=FALSE;
>.A:6 for(int index=0;index<MAX_KEY;index++){
YRXe j if(hCallWnd[index]==hWnd){
l#:Q V: if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
r#}%sof hCallWnd[index]=NULL;
vDL/PXNC HotKey[index]=0;
sRG3`>1 HotKeyMask[index]=0;
g==^ioS}* bRemoved=TRUE;
ZaV@}=Rd8 KeyCount--;
qd ZYaS ~ break;
my0->W%L }
D~,R@7 }
T9.gs}B0 }
n*uZ=M_/Q return bRemoved;
60$
}
y%AJ>@/; >TJ$Z3 vUNE!j DLL中的钩子函数如下:
lDXH<W? %;gWl1&5 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
EtG)2) {
djp(s$:{4 BOOL bProcessed=FALSE;
C\[UAxZ3X if(HC_ACTION==nCode)
.42OSV {
C?J%^?v if((lParam&0xc0000000)==0xc0000000){// 有键松开
hkxZ=l switch(wParam)
.})8gL7V {
%(6Wr E5F6 case VK_MENU:
_X/`4 G MaskBits&=~ALTBIT;
z@j&vW break;
}8e%s;C case VK_CONTROL:
:
Dlk`? MaskBits&=~CTRLBIT;
'{~ej: break;
VN;M;fMs case VK_SHIFT:
u,q#-d0g; MaskBits&=~SHIFTBIT;
)c/BDC7g break;
tIw4V^'| default: //judge the key and send message
WBdb[N6\ break;
K}@:>;*9 }
pcG q for(int index=0;index<MAX_KEY;index++){
`.XU|J*z, if(hCallWnd[index]==NULL)
Ab)7hCUW continue;
xg&vZzcl if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
P{ o/F {
+aap/sYp SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
a{=~#u8 bProcessed=TRUE;
6]*qx5m`<l }
^S@b* }
fQh!1 R }
,#{aAx|] else if((lParam&0xc000ffff)==1){ //有键按下
D1a4+AyI switch(wParam)
vbU{Et\^ {
4a~_hkY] case VK_MENU:
+{Ttv7l_2 MaskBits|=ALTBIT;
:gn!3P}p? break;
Qp}<8/BM\ case VK_CONTROL:
'u~use" MaskBits|=CTRLBIT;
ty
?y&~axk break;
AmHIG_' case VK_SHIFT:
jw)t"S/E MaskBits|=SHIFTBIT;
>?tpGEZ\ break;
4k8 @u default: //judge the key and send message
UF
tTt`N2 break;
|BR&p)7) }
~yV0SpL for(int index=0;index<MAX_KEY;index++){
[LK
9^/V if(hCallWnd[index]==NULL)
u/:@+rTV_ continue;
#<:khs6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
;pJ7k23( {
b%6_LK[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
,==lgM2V> bProcessed=TRUE;
<ZLs+|1 }
4T"P#)z }
*(J<~:V? }
;S/fe(C
if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
=:DNb( for(int index=0;index<MAX_KEY;index++){
IN"qJ3<k if(hCallWnd[index]==NULL)
E*zk?G| continue;
Z3Y%VHB_F( if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
P_}$|zj7 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
wSGUNP9 //lParam的意义可看MSDN中WM_KEYDOWN部分
Zx6BK=4G }
Fa8>+ }
|dO1w.x/ }
_#I0m( return CallNextHookEx( hHook, nCode, wParam, lParam );
8oK30? }
,fbO} xYbF76B 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:
HDYoM PeOgXg)L`z BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
H)Yv_gT BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
AyWCb
2B|3`trY4x 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:
#*fB~Os: TX;|g1K LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
=6'A8d {
hM-qC|! if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
v?}/WKe+0 {
MEE]6nU //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Mppb34y SaveBmp();
'yl`0,3wV return FALSE;
-H{{ }
Kgcg:r: …… //其它处理及默认处理
`C3F?Lch }
"qF8'58 GCrMrZ6 ,+XQ!y% 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。
vjW S35i XS>4efCJ 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。
`eA 0Z:`g! ) E5ax~ 二、编程步骤
Xa36O5$4]9 gxF3gM 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
'n\ZmG{ u
VB&DE 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
v+Hu=RZE A\:M}D-( 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
=^6]N~*,D zk?lNs 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Zscmc;G !JJY(o 5、 添加代码,编译运行程序。
Upf1*$p r]TeR$NJ 三、程序代码
%
L]xar |
r2'B ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
uu HWN| #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
`":< ]lj #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
h)sc-e #if _MSC_VER > 1000
?=6zgb"9- #pragma once
zg]9~i8 #endif // _MSC_VER > 1000
:[Fwc #ifndef __AFXWIN_H__
)V3G~p=0 #error include 'stdafx.h' before including this file for PCH
kIQMIL0+ #endif
T2k5\r8 #include "resource.h" // main symbols
}ZV$_ class CHookApp : public CWinApp
_TH'v:C {
o)w'w34FCT public:
yQ\c<z^e CHookApp();
rN
OwB2e // Overrides
=5+:<e,& // ClassWizard generated virtual function overrides
Hh,\>= ': //{{AFX_VIRTUAL(CHookApp)
8I
JFQDGA9 public:
jQc$>M<"o virtual BOOL InitInstance();
S-My6'ar virtual int ExitInstance();
u)%J5TR .Y //}}AFX_VIRTUAL
H`kfI"u8 //{{AFX_MSG(CHookApp)
M>-x\[n+ // NOTE - the ClassWizard will add and remove member functions here.
;vuok]@ // DO NOT EDIT what you see in these blocks of generated code !
I6\l6 o //}}AFX_MSG
[(]uin+9Q DECLARE_MESSAGE_MAP()
2: fSn&*/> };
(T,ST3{*k LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
IU&n!5d$)| BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(.Sj"6+ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
.^uNzN~ BOOL InitHotkey();
R9k
Z# BOOL UnInit();
IpHGit28 #endif
(tys7og$' tMC<\e //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
5s8k^n"A #include "stdafx.h"
fAXF_wj #include "hook.h"
?bY'J6n. #include <windowsx.h>
@r=O~x #ifdef _DEBUG
$5(co)C #define new DEBUG_NEW
.a?GC( #undef THIS_FILE
%vgn>A?]1 static char THIS_FILE[] = __FILE__;
6~j6M4* #endif
Iq(BH^K #define MAX_KEY 100
S9-FKjU #define CTRLBIT 0x04
.-uH ax0 #define ALTBIT 0x02
~#Vrf0w/ #define SHIFTBIT 0x01
Ea 0
j} #pragma data_seg("shareddata")
o#CNr5/ HHOOK hHook =NULL;
7iT#dpF/A UINT nHookCount =0;
RWK|?FD\< static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
9/`T]s" static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
KftZ^mk+p static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
uK1DC i static int KeyCount =0;
\K55|3~R static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Xbe=_9l&p #pragma data_seg()
rdSkGb HINSTANCE hins;
C,&r7 void VerifyWindow();
5@6F8:x}V BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
??)IPRv?yF //{{AFX_MSG_MAP(CHookApp)
\\xoOA. // NOTE - the ClassWizard will add and remove mapping macros here.
k,OP*M // DO NOT EDIT what you see in these blocks of generated code!
V& _ //}}AFX_MSG_MAP
v:|_!+g: END_MESSAGE_MAP()
)$XcO] 274F+X CHookApp::CHookApp()
?31#:Mg6g+ {
Gu-6~^Km9 // TODO: add construction code here,
W:'H&`0 // Place all significant initialization in InitInstance
G*JasHFs }
wa2?%y_G !UDTNF?1 CHookApp theApp;
:;HJ3V; LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
t,Ss3 {
LB$#]
Z BOOL bProcessed=FALSE;
\W4|.[ if(HC_ACTION==nCode)
xim'TVwvC {
plN:QS$
if((lParam&0xc0000000)==0xc0000000){// Key up
C/_Z9LL?F switch(wParam)
?)X0l {
rvouE: case VK_MENU:
+XMKRt MaskBits&=~ALTBIT;
b"k1N9 break;
#?u#=] case VK_CONTROL:
P-U9FKrt MaskBits&=~CTRLBIT;
5L!EqB>m; break;
%=e^MN1 case VK_SHIFT:
h&}z@ MaskBits&=~SHIFTBIT;
7wKT:~~oS3 break;
VN]70LFz*i default: //judge the key and send message
L.X"wIs^ break;
8Mg wXH }
Qa>t$`o` for(int index=0;index<MAX_KEY;index++){
21_sg f? if(hCallWnd[index]==NULL)
[&eG>zF" continue;
POB6#x if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Klrd|;C {
@?e+;Sx SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
k}18
~cWM bProcessed=TRUE;
Q!.JV.( }
^Q,-4\ec }
5d|hP4fEc }
fkk&pu else if((lParam&0xc000ffff)==1){ //Key down
2:GS(%~ switch(wParam)
upi\pXv {
DXyRNE<G[C case VK_MENU:
VYG o; MaskBits|=ALTBIT;
DsX+/)d break;
o@2Y98~Q} case VK_CONTROL:
\8Y62 MaskBits|=CTRLBIT;
&uP,w# break;
eU(cn8/} case VK_SHIFT:
7G':h0i8 MaskBits|=SHIFTBIT;
%/.yGAPkx break;
|pgrR7G' default: //judge the key and send message
vX30Ijm break;
tqk^)c4FF( }
vLI'Z)\ for(int index=0;index<MAX_KEY;index++)
tw
k {
grVPu! B; if(hCallWnd[index]==NULL)
A9Kt^HR continue;
BMi5F?Q'G if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
5LaF'>1yY {
xlIVLv6dO SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
dj-/%MU bProcessed=TRUE;
*jC Hv }
&a8%j+j }
e5
N$+P" }
tXfXuHa if(!bProcessed){
2,'~' for(int index=0;index<MAX_KEY;index++){
6v?tZ&,
G if(hCallWnd[index]==NULL)
5D+rR<pD}" continue;
.VXadgM if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
pddumbp SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
b]5/IT)@O }
mlLx!5h= }
Mh"iyDGA }
<H,E1kGw9 return CallNextHookEx( hHook, nCode, wParam, lParam );
bUU\bc }
k|4}Do%; }y>/#]X BOOL InitHotkey()
|Ml~_m {
y3@m1>]09 if(hHook!=NULL){
thLx!t nHookCount++;
z?<Xx?Kk return TRUE;
a! gj_ }
>c)-o}bd^ else
^UmhSxQ## hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
q"0_Px9P if(hHook!=NULL)
^Ycn&`s nHookCount++;
|BEoF[1 return (hHook!=NULL);
] kdU]}z }
+OaBA>Jh9 BOOL UnInit()
ak_n {
*JArR1J if(nHookCount>1){
1EMrXnv, nHookCount--;
cC pNF `DN return TRUE;
h^v+d*R
N }
E3V_qT8 BOOL unhooked = UnhookWindowsHookEx(hHook);
^6@6BYf) if(unhooked==TRUE){
;iA$yw: nHookCount=0;
m^$KDrkD hHook=NULL;
K |^OnM }
+<Y1`kV) return unhooked;
|-9##0H }
+8}8b_bgH >@tJ7mM BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
0ky3rFSh1 {
1VA%xOURh BOOL bAdded=FALSE;
h'B0rVQia> for(int index=0;index<MAX_KEY;index++){
Pd+Wb3 if(hCallWnd[index]==0){
Ow0( q^H< hCallWnd[index]=hWnd;
U!b~vrr^ HotKey[index]=cKey;
KBI36=UV HotKeyMask[index]=cMask;
NQx>u bAdded=TRUE;
eIcIl2 KeyCount++;
@NYlVk2 break;
.h-k*F0Ga) }
goZw![4l }
>p29|TFbV return bAdded;
]#;u] }
TBmmC}PEd F%I*m^7d BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
N)EJP~0 {
+{\b&q_ BOOL bRemoved=FALSE;
PTpGZ2FZ for(int index=0;index<MAX_KEY;index++){
PNpH)'C| if(hCallWnd[index]==hWnd){
{#N,&?[ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
H<Zs2DP` hCallWnd[index]=NULL;
N&G;` HotKey[index]=0;
'XI-x[w HotKeyMask[index]=0;
7I0K=
'D7 bRemoved=TRUE;
RY}:&vWDk KeyCount--;
obK6GG?ZE break;
4oPr|OKj{* }
P\3H<?@4 }
NKYHJf2?x }
r)gtx!bx return bRemoved;
uA%cie }
08z?i rsD?
;XzH void VerifyWindow()
JqK-vvI {
}g"K\x:Z for(int i=0;i<MAX_KEY;i++){
T^@P.zX if(hCallWnd
!=NULL){ `aL4YH-v
if(!IsWindow(hCallWnd)){ iza.' Mm~
hCallWnd=NULL; FTh/1"a
HotKey=0; /t04}+,e^
HotKeyMask=0; l(3\ekU!
KeyCount--; Mb+CtI_'
} ]Z>zf]<
} :@,UPc-+
} 2 W Wr./q
} )QB9zl:
ogJ>`0 +J
BOOL CHookApp::InitInstance() A}CpyRVCn
{ t+aE*Q
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Fv3:J~Yf
hins=AfxGetInstanceHandle(); L{u1_
InitHotkey(); $+n5l@W
return CWinApp::InitInstance(); i&Me7=~
} =UV=F/Af^
xeSv+I-b
int CHookApp::ExitInstance() 98%6Z8AS6U
{ l)qGG$7$
VerifyWindow(); jO5Wemqf
UnInit(); {%8=qJ3@
return CWinApp::ExitInstance(); tVHQ$jJY%
} zfA"xD
IWnyqt(k
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file k(wJ6pc
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) J
Sms
\
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2KSt4oa
#if _MSC_VER > 1000 s/OXZ<C|
#pragma once u`wT_?%w
#endif // _MSC_VER > 1000 9S{?@*V
z1LY|8$G
class CCaptureDlg : public CDialog 7J$Yd976
{ '?b.t2
// Construction .GuZV'
public: g&L $5
BOOL bTray; }\d3
BOOL bRegistered; Nu6]R677Y
BOOL RegisterHotkey(); UY&DXIP M
UCHAR cKey; (=w ff5U
UCHAR cMask; ,CjJO -
void DeleteIcon(); Op
;){JT
void AddIcon(); fZt3cE\
UINT nCount; &:Sb$+z
void SaveBmp(); 23gJD8i8
CCaptureDlg(CWnd* pParent = NULL); // standard constructor
?`Som_vKO
// Dialog Data l(?Yx
//{{AFX_DATA(CCaptureDlg) EhHW`
enum { IDD = IDD_CAPTURE_DIALOG }; } bEu+bZ
CComboBox m_Key; kA(q-Re$B*
BOOL m_bControl; AK5$>Pkvk
BOOL m_bAlt; mNAp FwZ
BOOL m_bShift; 9Jp"E5Ql)
CString m_Path;
g<PdiVp+
CString m_Number; x^JjoI2vf
//}}AFX_DATA }NETiJ"6
// ClassWizard generated virtual function overrides 2s8(r8 AI
//{{AFX_VIRTUAL(CCaptureDlg) 0%5x&vx'S
public: jY5BVTWnV
virtual BOOL PreTranslateMessage(MSG* pMsg); gb@ |\n
protected: My\
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V39)[FH}
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); oxL4* bqZ
//}}AFX_VIRTUAL e3 {L%rQE
// Implementation _Rnq5y
protected: Abf=b<bu
HICON m_hIcon; a3oSSkT
// Generated message map functions m&Lc."
//{{AFX_MSG(CCaptureDlg) U-3uT&m*9.
virtual BOOL OnInitDialog(); Is !DiB
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); xn)r6
afx_msg void OnPaint(); &_y+hV{
afx_msg HCURSOR OnQueryDragIcon(); %]@K}!)2
virtual void OnCancel(); DwC8?s*2H
afx_msg void OnAbout(); ;t}ux
afx_msg void OnBrowse(); -Fs^^={Q
afx_msg void OnChange(); 9wC:8@`6E
//}}AFX_MSG O5p]E7/e
DECLARE_MESSAGE_MAP() 2F#R;B#2
}; 7c Gq.U
#endif &tw
=rDIU&0Y
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file u(|k/~\
#include "stdafx.h" =.Q|gZ
#include "Capture.h" zwKm;;v8
#include "CaptureDlg.h" "RJf2~(ZX
#include <windowsx.h> ))>)qav
#pragma comment(lib,"hook.lib") xj!_]XJ^w
#ifdef _DEBUG dSBW&-p
#define new DEBUG_NEW Ctxx.MM
#undef THIS_FILE DeTZl+qm1E
static char THIS_FILE[] = __FILE__; SAGLLk07G
#endif RU'DUf
#define IDM_SHELL WM_USER+1 6axmH~_
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C&ivjFf
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v`$9;9
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; WtTwY8HC
class CAboutDlg : public CDialog P'6(HT>F?
{ !S',V&Yb
public: #UH7z 4u
CAboutDlg(); IK-E{,iKc
// Dialog Data `-N&cc
//{{AFX_DATA(CAboutDlg) ?$^qcpJCp
enum { IDD = IDD_ABOUTBOX }; hrRX=
//}}AFX_DATA A
fctycQ-
// ClassWizard generated virtual function overrides KCed!OJ+
//{{AFX_VIRTUAL(CAboutDlg) S,,3h0$X
protected: RKP->@Gs
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8_tMiIE-pS
//}}AFX_VIRTUAL s/K}]F
// Implementation -ijQTB
protected: X+K$y:UZ
//{{AFX_MSG(CAboutDlg) a;`-LOO5&
//}}AFX_MSG (UV+/[,
DECLARE_MESSAGE_MAP() uOrvmb
}; W+~ w
.SdEhW15)
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1W5\
{ 8D:{05
//{{AFX_DATA_INIT(CAboutDlg) 5yQv(<~*G
//}}AFX_DATA_INIT , &HZvU&
} ^"%SHs
t=]&q.
void CAboutDlg::DoDataExchange(CDataExchange* pDX) FZ/l
T-"
{ tH"SOGfSt
CDialog::DoDataExchange(pDX); q'?:{k$%
//{{AFX_DATA_MAP(CAboutDlg) hqY9\,.C
//}}AFX_DATA_MAP ${ ~UA6
} 8E Y<^:
5 b[:B~J
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) aM9St!i
//{{AFX_MSG_MAP(CAboutDlg) )8yee~+TN
// No message handlers OR^Wd
//}}AFX_MSG_MAP -j[n^y'v
END_MESSAGE_MAP() 5@Q4[+5&_
*[7,@S/<F
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v[6 BESu
: CDialog(CCaptureDlg::IDD, pParent) b~b(Ed{r
{ <5(8LMF
//{{AFX_DATA_INIT(CCaptureDlg) r<O^uz?Di
m_bControl = FALSE; Em@h5V
m_bAlt = FALSE; d#a
m_bShift = FALSE; Ik1,?A
m_Path = _T("c:\\"); h{sW$WA
m_Number = _T("0 picture captured."); 2ezuP F
nCount=0; KF'H|)!K
bRegistered=FALSE; *4qsM,t
bTray=FALSE; -H`G6oMOO
//}}AFX_DATA_INIT R\:C|/6f
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 [ylGNuy
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); VSZ 6;&2^
} RQ{w`>K
_'H<zZo
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) S53%*7K.
{ ["Q8`vV0WO
CDialog::DoDataExchange(pDX); J5Fg]O*
//{{AFX_DATA_MAP(CCaptureDlg) '{cN~A2b4
DDX_Control(pDX, IDC_KEY, m_Key); ^^?DYC
DDX_Check(pDX, IDC_CONTROL, m_bControl); oJ8_hk<Va8
DDX_Check(pDX, IDC_ALT, m_bAlt); ''BP4=r5n
DDX_Check(pDX, IDC_SHIFT, m_bShift); 54J<ZXCs
DDX_Text(pDX, IDC_PATH, m_Path); $hSu~}g
DDX_Text(pDX, IDC_NUMBER, m_Number); 9'toj%XQ
//}}AFX_DATA_MAP Hs=!.tZ,
} 7^iF,N
6ddkUPTF
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) NTL#!
//{{AFX_MSG_MAP(CCaptureDlg) m4Wn$Z
ON_WM_SYSCOMMAND() E}@8sY L
ON_WM_PAINT() f/;\/Q[Z7
ON_WM_QUERYDRAGICON() 45MK|4\Y_
ON_BN_CLICKED(ID_ABOUT, OnAbout) t48(GKF
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) {C]M]b*F6(
ON_BN_CLICKED(ID_CHANGE, OnChange) 4rM77Uw>
//}}AFX_MSG_MAP 1wc
-v@E
END_MESSAGE_MAP() -'PpY302
;@d%<yMf@
BOOL CCaptureDlg::OnInitDialog() XFu@XUk!K
{ N0vd>b
CDialog::OnInitDialog(); HqXo;`Yy}
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); g=Qga09
ASSERT(IDM_ABOUTBOX < 0xF000); z{#F9'\&
CMenu* pSysMenu = GetSystemMenu(FALSE); Y[~6f,?^
if (pSysMenu != NULL) ]Hd0
Y%
{ 50DPzn
CString strAboutMenu; :LBe{Jbw
strAboutMenu.LoadString(IDS_ABOUTBOX); q<yH!
if (!strAboutMenu.IsEmpty()) (C-z8R
Z6
{ WQ5sC[&
pSysMenu->AppendMenu(MF_SEPARATOR); ^Nsl5
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Bd
NuhV`0
} i9!Urq-
} H;sQ]:.*]
SetIcon(m_hIcon, TRUE); // Set big icon R^B2J+O
SetIcon(m_hIcon, FALSE); // Set small icon =(n'#mV
m_Key.SetCurSel(0); 3K?0PRg
RegisterHotkey(); mzT} C&hfP
CMenu* pMenu=GetSystemMenu(FALSE); )b%c]!
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "{x~j\<
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); K%pmE?%,8
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); "}OFwes
return TRUE; // return TRUE unless you set the focus to a control q5vs;,_
|
} /2@%:b)
0X0D8H(7Q
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;n;^f&;sJ
{ s3+O=5
if ((nID & 0xFFF0) == IDM_ABOUTBOX) d(@A
{ m@O\Bi}=}
CAboutDlg dlgAbout; 9wq%Fnt
dlgAbout.DoModal(); ZM#WdP
} @^` <iTK&p
else /M3D[aR<d
{ z'qVEHc)
CDialog::OnSysCommand(nID, lParam); 7%E1F)%
} GcU/
} -YuvEm#f
h+74W0
$
void CCaptureDlg::OnPaint() <y.D0^68
{ "q`%d_
if (IsIconic()) EkL\~^
{ nUd\4;J#
CPaintDC dc(this); // device context for painting *b)b#p
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Dz50,*}J
// Center icon in client rectangle ,oG"wgf
int cxIcon = GetSystemMetrics(SM_CXICON); @qC:% |>
int cyIcon = GetSystemMetrics(SM_CYICON); 0wkLM-lN
CRect rect; {cv;S2
GetClientRect(&rect); _#gsR"FZ$
int x = (rect.Width() - cxIcon + 1) / 2; bY2Mw8e%
int y = (rect.Height() - cyIcon + 1) / 2; ^J
RTi'v
// Draw the icon zl:D|h77
dc.DrawIcon(x, y, m_hIcon); vv0zUvmT
} t3GK{X
else d_,tXV"z&
{ m@,>d_|-K-
CDialog::OnPaint(); g\-3c=X
} S!q}Pn
} Lq [wabF
%8*d)AB:
HCURSOR CCaptureDlg::OnQueryDragIcon() ]T51;j'48
{ |f:d72{Qr
return (HCURSOR) m_hIcon; q8h{-^"
} Qwa"AY5pW
?8, N4T0)
void CCaptureDlg::OnCancel() +wUhB\F
*
{ 'sF563kE
if(bTray) d>`(.qvxR
DeleteIcon(); if}]8
CDialog::OnCancel(); rl^LSz
} -7O/ed+
^<VE5OM
void CCaptureDlg::OnAbout() z`5I1#PVA
{ Ozv.;}SE
CAboutDlg dlg; ]-'9|N*}l
dlg.DoModal(); e\_6/j7'
} :'dc=C
u}1vn} F{
void CCaptureDlg::OnBrowse() )/Xrhhx
{ \!QF9dP4
CString str; 5lxq-E3
BROWSEINFO bi; z{g<y^Im+E
char name[MAX_PATH]; I7PWOd
ZeroMemory(&bi,sizeof(BROWSEINFO)); 5tU"|10m3
bi.hwndOwner=GetSafeHwnd(); 5)zB/Ta<
bi.pszDisplayName=name; nTU~M~gky
bi.lpszTitle="Select folder"; ?03Zy3/
bi.ulFlags=BIF_RETURNONLYFSDIRS; 2jZ}VCzRG
LPITEMIDLIST idl=SHBrowseForFolder(&bi); iy82QNe
if(idl==NULL) 3=l-jGJk
return; B%@!\D#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]2%P``Yj
str.ReleaseBuffer(); \r%Vgne-g
m_Path=str; VQ?H:1R
if(str.GetAt(str.GetLength()-1)!='\\') 9`v:$(I
m_Path+="\\"; 9(F?|bfk
UpdateData(FALSE); LQ@|M.$A
} IJc#)J.2A
_~nex,;r
void CCaptureDlg::SaveBmp() :UcS$M1LE
{ OZ;E&IL
CDC dc; >1U@NK)HfY
dc.CreateDC("DISPLAY",NULL,NULL,NULL); D:ugP,
CBitmap bm; otVyuh
int Width=GetSystemMetrics(SM_CXSCREEN); S.)7u6/_!
int Height=GetSystemMetrics(SM_CYSCREEN); N&ql(#r
bm.CreateCompatibleBitmap(&dc,Width,Height); IVzA>Vd
CDC tdc; j& o+KV
tdc.CreateCompatibleDC(&dc); tN3 {7'\7
CBitmap*pOld=tdc.SelectObject(&bm); >.hGoT!_k
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); HCIF9{o1j>
tdc.SelectObject(pOld); aF{i
A\
BITMAP btm; ')<FLCFwT
bm.GetBitmap(&btm); lq8ko@
DWORD size=btm.bmWidthBytes*btm.bmHeight; :J`!'{r
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); C)96/k
BITMAPINFOHEADER bih; i>Bi&azx
bih.biBitCount=btm.bmBitsPixel; 6&QTVdK'O
bih.biClrImportant=0; _
1{5~
bih.biClrUsed=0; 0bxvM
bih.biCompression=0; ,okJ eZ
bih.biHeight=btm.bmHeight; .&x?`pER
bih.biPlanes=1; -mHhB(Td'
bih.biSize=sizeof(BITMAPINFOHEADER); z{3%Hq
bih.biSizeImage=size; /Tf*d>Yh;
bih.biWidth=btm.bmWidth; ptcLJ]+)
bih.biXPelsPerMeter=0; 8*#][wC2
bih.biYPelsPerMeter=0; CotMV^
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); w52HN;Jm
static int filecount=0; T :S{3
CString name; :z} _y&]
name.Format("pict%04d.bmp",filecount++); N"x\YHp
name=m_Path+name; ms\/=96F
BITMAPFILEHEADER bfh; ar
qLp|
bfh.bfReserved1=bfh.bfReserved2=0; y[WYH5&DJ
bfh.bfType=((WORD)('M'<< 8)|'B'); D
,ZNh1xt
bfh.bfSize=54+size; mYjiiql~
bfh.bfOffBits=54;
iRwW> a3/
CFile bf; cevV<Wy+
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :IT U0%;!+
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); d)GkXll1D
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @oqi@&L'C
bf.WriteHuge(lpData,size); /-K dCp~
bf.Close(); y5Wqu9C\Io
nCount++; 0"<;You
} %c&Ah
GlobalFreePtr(lpData); CAFE}|
if(nCount==1) aH PSnB&
m_Number.Format("%d picture captured.",nCount); uCP6;~Ns
else YaVc9du7
m_Number.Format("%d pictures captured.",nCount); LB*#
UpdateData(FALSE); ~2A$R'x b
} V0'p1J tD
.FbZVY c]
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 8X
?GY8W:
{ :
9?Cm`
if(pMsg -> message == WM_KEYDOWN) ,Z*3,/a
{ @2~O^5[>
if(pMsg -> wParam == VK_ESCAPE) 0o=6A<#x
return TRUE; K]pKe"M
if(pMsg -> wParam == VK_RETURN) P$6f +{
return TRUE; :YJ7J4
} R#7+
return CDialog::PreTranslateMessage(pMsg); &X]=Qpl
} ,4>WLJDo
\,%o>M'
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) QVG0>,+}$
{ ;[OJ-|Q
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @maZlw1q
SaveBmp(); itC *Z6^
return FALSE; %I|+_ z&x
} hKH$AEHEU}
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ss<_K>wk
CMenu pop; d1uG[
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); IGK_1@tq
CMenu*pMenu=pop.GetSubMenu(0); }Uwkef.Q
pMenu->SetDefaultItem(ID_EXITICON); 27*(oT
CPoint pt; 1Oca@E\Z.
GetCursorPos(&pt); ^Azt.\fMX
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); [zh4W*K_cq
if(id==ID_EXITICON) "\zj][sL
DeleteIcon(); _Xk03\n6
else if(id==ID_EXIT) L VU)W^
OnCancel(); 1IF'>*
return FALSE; C DnR
} 6N%L8Q
LRESULT res= CDialog::WindowProc(message, wParam, lParam); SZK)q
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) zhA',p@K?_
AddIcon(); ^iV`g?z
return res; d#vSE.&
} 94h_t@Q/1
u_p7Mcb
void CCaptureDlg::AddIcon() |`k1zc)9
{ RvPniT(<?
NOTIFYICONDATA data; PV]k3&y
data.cbSize=sizeof(NOTIFYICONDATA); w`.T/
CString tip; y=oVUsG
tip.LoadString(IDS_ICONTIP); (N*<\6kr
data.hIcon=GetIcon(0); BS-:dyBw
data.hWnd=GetSafeHwnd(); ! =\DC,-CB
strcpy(data.szTip,tip); re ]Ste
data.uCallbackMessage=IDM_SHELL; _d\u!giy
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; C"U[ b%
data.uID=98;
rTP5-4
Shell_NotifyIcon(NIM_ADD,&data); <*A|pns
ShowWindow(SW_HIDE); n?ZL"!$
bTray=TRUE; o%/-5-
} ]{Mci]H6T
<uBhi4
void CCaptureDlg::DeleteIcon() #Cg}!38
{ G. -h=DT]
NOTIFYICONDATA data; q:2aPfo&
data.cbSize=sizeof(NOTIFYICONDATA); *;OJ~zT
data.hWnd=GetSafeHwnd(); [V> :`?
data.uID=98; )p/=u@8_f
Shell_NotifyIcon(NIM_DELETE,&data); 2,8/Cb
ShowWindow(SW_SHOW); k W<Yda<a
SetForegroundWindow(); b"R, p=M
ShowWindow(SW_SHOWNORMAL); KdOh'OrT9.
bTray=FALSE; D0Vyh"ua
} H9Y2n 0
e(OwS?K
void CCaptureDlg::OnChange() 6m, KL5>W
{ Ism^hyL
RegisterHotkey(); S+) l[0
} YM#
Qq,i
BOOL CCaptureDlg::RegisterHotkey() 6?1s`{yy
{ l)tTg+:
UpdateData(); Ie G7@
UCHAR mask=0; _DPB?)!x
UCHAR key=0; e5qrQwU
if(m_bControl) ill-%OPeg
mask|=4; {h/OnBwG
if(m_bAlt) %XEKhy
mask|=2; 0`VD!_`
if(m_bShift) N_u&3CG
mask|=1; Kcscz,
key=Key_Table[m_Key.GetCurSel()]; %sO Wg.0_
if(bRegistered){ 5u2{n rc
DeleteHotkey(GetSafeHwnd(),cKey,cMask); <ICZ"F`S
bRegistered=FALSE; 1A7 %0/K-]
} ~w
Zl2I
cMask=mask; ]dPVtk
cKey=key; ~`*1*;Q<H|
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); d] b~)!VW
return bRegistered; I! h(`
} 55 S\&Ad$
T-L|Q,-{-
四、小结 M!eoe5
N3uMkH-<
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。