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:
^%_B'X9
R5]R
pW=G 一、实现方法
S-2xe?sb %c^]Rdl 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:
FGwz5@|E JS(KCY 9 #pragma data_seg("shareddata")
W\eB HHOOK hHook =NULL; //钩子句柄
R2]?9\II UINT nHookCount =0; //挂接的程序数目
m.K"IXD static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
)Xd=EWGUS static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
!YJdi~q
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
"6Dz~5 static int KeyCount =0;
Br#]FB|tD static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
*qOo,e #pragma data_seg()
*<9 D] pbqa 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。
?9?0M A<[i sK?[1BI 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:
/2l4'Q= Kjz,p^Y\ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
tm]75*? cKey,UCHAR cMask)
iZjvO`@[ {
1Za\T?V BOOL bAdded=FALSE;
Nq*\{rb for(int index=0;index<MAX_KEY;index++){
boN)C?"^h if(hCallWnd[index]==0){
I5x/N. hCallWnd[index]=hWnd;
9,y&?GLP HotKey[index]=cKey;
VKN^gz HotKeyMask[index]=cMask;
$ ~D`-+J bAdded=TRUE;
H>M%5bj KeyCount++;
vO0ql break;
:eIBK }
$u3N ',& }
j,1,; return bAdded;
$ng\qJ"HF }
~Zj?%4 //删除热键
Wb4sfP_ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
c&0IJ7fZG {
u8?ceM^r BOOL bRemoved=FALSE;
;OdUH for(int index=0;index<MAX_KEY;index++){
@L0wd> if(hCallWnd[index]==hWnd){
^1Yx'ua' if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
pM#:OlqC hCallWnd[index]=NULL;
k*-+@U"+ HotKey[index]=0;
t S!~>X HotKeyMask[index]=0;
Upv2s:wa}z bRemoved=TRUE;
*:&fw'vd, KeyCount--;
"\>3mVOb break;
J| 'T2g }
z4f5@ }
{X"X.`p }
x(t}H8q return bRemoved;
l|&|+u# }
@{nT4{ Aga7X@fV( }XXE
hOO DLL中的钩子函数如下:
_O rE{ N@A#e/8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
X,OxvmDm {
)E4COw+ BOOL bProcessed=FALSE;
-_4! id if(HC_ACTION==nCode)
3aDma/ {
hqBwA1](a if((lParam&0xc0000000)==0xc0000000){// 有键松开
u{3KV6MS switch(wParam)
UWusSi3+LG {
PkVXn
case VK_MENU:
+'KM~c?] MaskBits&=~ALTBIT;
yqBu7E$X break;
nB:Bw8U"Q case VK_CONTROL:
xv%}xeEV MaskBits&=~CTRLBIT;
WYh7Y break;
)b-G2< kb case VK_SHIFT:
%2L9kw' MaskBits&=~SHIFTBIT;
Tl1?5 break;
##n\9ipD default: //judge the key and send message
L`Ic0}|lzy break;
p5[uVRZ }
K3Xy%pqR# for(int index=0;index<MAX_KEY;index++){
S\X_!| if(hCallWnd[index]==NULL)
hT
Xc0 continue;
Mr1pRIYMd if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A%2!Hr {
9z-"JnM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
m0#hG
x bProcessed=TRUE;
?3|ZS8y }
s=d?}.E$ }
rcbixOT }
gTq-\k( else if((lParam&0xc000ffff)==1){ //有键按下
y~d W=zO switch(wParam)
"ulaF+ {
m&%N4Q~X> case VK_MENU:
2MC\~"L< MaskBits|=ALTBIT;
'v,W
gPe break;
3a5H<3w_ case VK_CONTROL:
!uZ+r% MaskBits|=CTRLBIT;
@2u<Bh}} break;
t #AQD]h case VK_SHIFT:
QxkfP %_g MaskBits|=SHIFTBIT;
~ 52 break;
f>'7~69 default: //judge the key and send message
H}@|ucM"\ break;
u)V*o }
W`\H3?C`xQ for(int index=0;index<MAX_KEY;index++){
H{V-C_ if(hCallWnd[index]==NULL)
J^XH^`' continue;
_+. t7q^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
jmb\eOq+~V {
}+B7C2_\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
H z6H,h bProcessed=TRUE;
*p-Fn$7\n }
I)x:NF6JO }
r" D |1 }
IQ_0[ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
EW!$D for(int index=0;index<MAX_KEY;index++){
OBZ |W**N" if(hCallWnd[index]==NULL)
W@G[ gS\T continue;
MPB6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.xx#>Y-\ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Q(sbClp" //lParam的意义可看MSDN中WM_KEYDOWN部分
06`__$@h }
I45A$nV#Q }
j\vK`.z }
bXW)n<y return CallNextHookEx( hHook, nCode, wParam, lParam );
vBpg6
fX }
-r2cK{Hhp& -{wuF0f 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:
e\dT~)c zm:=d>D.. BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
y(R*Z^c}d, BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
y"hM6JI J'EK5=H 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:
EH3G|3^xz W>~%6K>p LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
SQ!lgm1bA {
P=@lkF!\# if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
mx[^LaR>v {
%8tN$8P //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
~Qsj)9 SaveBmp();
@}Ixr{t return FALSE;
M~Slc*_% }
]~zJ7I …… //其它处理及默认处理
3azc `[hl }
&>jkfG #R8l"]fxr? {Y"r]:5i 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。
{XX Nl)% D5>~'N3b 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。
i6CYD >FHsZKJ
二、编程步骤
c #!6 :U q]~e 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";
?>8zU;Aj DRoxw24 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
713M4CtJ O-5U|wA 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;
DxgT]F% 5Nb_K`Vp* 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;
N]}+F w\5 cv4M[]U~ 5、 添加代码,编译运行程序。
c.Y8CD.tqL uq%3;#[0 三、程序代码
Q$0%~`t /&d`c=nH ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
F\R}no5C #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
ebe@.ZVSi #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
E@6r{uZ# #if _MSC_VER > 1000
`_A?a_[* #pragma once
.4W>9
8 #endif // _MSC_VER > 1000
^6oqq[$ #ifndef __AFXWIN_H__
}.) 43(>] #error include 'stdafx.h' before including this file for PCH
+fQL~0tA #endif
]~Vu-@
/} #include "resource.h" // main symbols
KdJx#Lc class CHookApp : public CWinApp
TQd FC\@f" {
u2BW]T] public:
nj0AO0 CHookApp();
#(+HSZm // Overrides
_`{{39 F // ClassWizard generated virtual function overrides
llfiNEK5; //{{AFX_VIRTUAL(CHookApp)
-xu.=n@, public:
+7<>x-+ virtual BOOL InitInstance();
/)?P>!#;\ virtual int ExitInstance();
@1&;R //}}AFX_VIRTUAL
_L'cyH.cn //{{AFX_MSG(CHookApp)
Hq\E06S@ // NOTE - the ClassWizard will add and remove member functions here.
;3}EBcw) // DO NOT EDIT what you see in these blocks of generated code !
([CnYv //}}AFX_MSG
T5jG IIa DECLARE_MESSAGE_MAP()
UX'NJ1f };
P"uHtHK LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
o-=d|dWG BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
NZC='3Uz BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
.hlQ?\ BOOL InitHotkey();
#!Cter2 BOOL UnInit();
/D$+b9FR< #endif
,Q=)$ `% ?hJsN //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
EcU'* #include "stdafx.h"
)=E~CpKV #include "hook.h"
;IuK2iDt< #include <windowsx.h>
yEUNkZ5^ #ifdef _DEBUG
k g,ys4 #define new DEBUG_NEW
g{W6a2 #undef THIS_FILE
TjUZv 1(L static char THIS_FILE[] = __FILE__;
{eswe #endif
#A/]Vs$ #define MAX_KEY 100
E/7vIg
F #define CTRLBIT 0x04
{y&\?'L' #define ALTBIT 0x02
s"=F^# #define SHIFTBIT 0x01
`$V[;ld(mz #pragma data_seg("shareddata")
[+'BQ HHOOK hHook =NULL;
c2/R]%`)9 UINT nHookCount =0;
:PD`PgQ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
6A$_&? static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
'9 *|N= static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
K=c=/`E static int KeyCount =0;
-4vHK!l static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
rv,NQZ #pragma data_seg()
2E3?0DL", HINSTANCE hins;
-7k|6"EwM void VerifyWindow();
GSGyF BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
fVH*dX'Jz //{{AFX_MSG_MAP(CHookApp)
%oh`EGmVP // NOTE - the ClassWizard will add and remove mapping macros here.
2q-:p8 // DO NOT EDIT what you see in these blocks of generated code!
aYaG]&hb
//}}AFX_MSG_MAP
T/GgF&i3 END_MESSAGE_MAP()
nIyROhZ N)y^</Ya CHookApp::CHookApp()
}fJ:wku {
FQk_#BkK // TODO: add construction code here,
V8sH{R- // Place all significant initialization in InitInstance
.'^6QST }
.DDg%z `Di ^6UK( CHookApp theApp;
smfG,TI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
&RKH2R {
E!zd( BOOL bProcessed=FALSE;
4_Qa=T8 if(HC_ACTION==nCode)
n|70x5Z?}J {
,DQGv_ if((lParam&0xc0000000)==0xc0000000){// Key up
mL:m;>JJ n switch(wParam)
@-wNrW$ {
});cX$ case VK_MENU:
ku/\16E/k MaskBits&=~ALTBIT;
35Ai;mU' break;
.'t (-eT, case VK_CONTROL:
Z/2,al\ MaskBits&=~CTRLBIT;
Js\-['` break;
P0%N
Q1bn case VK_SHIFT:
Ur'9bl{5 MaskBits&=~SHIFTBIT;
k$e D(cW$ break;
Gw
~{V default: //judge the key and send message
6gj]y^} break;
Pm$F2YrO3 }
Km6Ub?/7o for(int index=0;index<MAX_KEY;index++){
yGb a if(hCallWnd[index]==NULL)
Ik`O.Q.} continue;
|-~b$nUe if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
f{)+-8 {
_1I K$gb[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
E]?)FH<oP bProcessed=TRUE;
UZzNVIXA% }
y,MPGW_ }
{eEBrJJeB }
x&at^Fp else if((lParam&0xc000ffff)==1){ //Key down
Oo FgQEr@ switch(wParam)
(C,e6r Y {
;tJWOm case VK_MENU:
PeO] lq MaskBits|=ALTBIT;
sW
}<zGYd break;
[/
AIKZM< case VK_CONTROL:
h S4.3]ei MaskBits|=CTRLBIT;
xC<=~( break;
)VNM/o%Q case VK_SHIFT:
J!rY
6[t MaskBits|=SHIFTBIT;
oFWt(r break;
?Phk~ jE default: //judge the key and send message
js~tKUvg break;
GxxDY]! }
Yl$X3wi for(int index=0;index<MAX_KEY;index++)
xpF](>LC( {
t5xb"F
if(hCallWnd[index]==NULL)
X4a^mw\" continue;
Odm#wL~E if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
zG_p"Z7, {
X:>$8 ^gS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
JjQ8|En bProcessed=TRUE;
1Q]Rd }
UEzsDJu }
cv2]* }
HN{z T& if(!bProcessed){
yf!,4SUkU for(int index=0;index<MAX_KEY;index++){
qpI]R if(hCallWnd[index]==NULL)
2UiR~P]% continue;
X/l;s if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
cph~4wCS[U SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
@dl8(ILk' }
[u`6^TycP }
{(4# )K2g% }
(?vK_{ return CallNextHookEx( hHook, nCode, wParam, lParam );
-ey)J
+?t }
D|l,08n"? K1OkZ6kl BOOL InitHotkey()
!DPF7x(-{ {
yG\UW&P if(hHook!=NULL){
<?YA,"~ nHookCount++;
iwU[6A return TRUE;
1_uvoFLk }
Ry?4h\UX5 else
?Nf
5w hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
>.e+S?o if(hHook!=NULL)
}x:0os nHookCount++;
oaK.kOo return (hHook!=NULL);
h./P\eDc }
eCWPhB6l BOOL UnInit()
iCP~O {
pISp*& if(nHookCount>1){
RP!
X8~8 nHookCount--;
*nRNg.i3D return TRUE;
?iv=53<c# }
{:bN/zV# BOOL unhooked = UnhookWindowsHookEx(hHook);
n*<v]1 if(unhooked==TRUE){
&J$##B nHookCount=0;
e\F}q)_ hHook=NULL;
_fn1) }
Y.sz|u 1 return unhooked;
:U'Cor
H }
;JT(3yK4>p };b1aha G BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
_Zc4=c,K {
l+'F_a BOOL bAdded=FALSE;
.TpsJXF for(int index=0;index<MAX_KEY;index++){
19t{|w< if(hCallWnd[index]==0){
G-u]L7t&1 hCallWnd[index]=hWnd;
NmpnJu|8 HotKey[index]=cKey;
$4m*kQ HotKeyMask[index]=cMask;
;a
r><w bAdded=TRUE;
X%}nFgqQ KeyCount++;
V'pqxjfd break;
n lGHT }
]*N1t>fb }
RLVATM5 return bAdded;
3@<zg1.9- }
@?kJ). W0I4Vvh_" BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Z7a945Jd {
[XR$F@o BOOL bRemoved=FALSE;
nh.32q] for(int index=0;index<MAX_KEY;index++){
`yO'[2 if(hCallWnd[index]==hWnd){
$B (kZ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
d`y!cu2} hCallWnd[index]=NULL;
>IfV\w32 HotKey[index]=0;
vFv3'b$;G HotKeyMask[index]=0;
i=S~(gp bRemoved=TRUE;
l\OLyQ KeyCount--;
i|WQ0fD break;
j;0vAf }
bHE2,;o }
m Y,|J\w@ }
vB\]u. return bRemoved;
@N@F,~[RR2 }
;C.S3} 0#_'o , void VerifyWindow()
j<<3Pr {
}UwO<# for(int i=0;i<MAX_KEY;i++){
7gF"=7{- if(hCallWnd
!=NULL){ (Z]HX@"{J
if(!IsWindow(hCallWnd)){ zUJZ`seF
hCallWnd=NULL; 4T6 {Y
HotKey=0; cVnJ^*Z
HotKeyMask=0; ]=pR
KeyCount--; zP\7S}p7%
} )!:sFa
1
} $'rG-g!f\
} =q7Z qP
} SRIA*M.B}
4<dcB@v
BOOL CHookApp::InitInstance() kR CQv-*
{ EOj"V'!
AFX_MANAGE_STATE(AfxGetStaticModuleState()); /P|fB]p
hins=AfxGetInstanceHandle(); '7^M{y/dU
InitHotkey(); }je,")#W
return CWinApp::InitInstance(); ~}EMk 3
} ,l YE
"5R~(+~<@
int CHookApp::ExitInstance() Q_-_^J
{ i':ydDOOHA
VerifyWindow(); C?v[Z]t
UnInit(); Z>c3
return CWinApp::ExitInstance(); m7a#qs;,
} v\16RD
,YTIC8qKr
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file L37 Y+C//
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) X[
q+619
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ x-OA([;/
#if _MSC_VER > 1000 IG)s^bP
#pragma once ;<yd^Xs
#endif // _MSC_VER > 1000 @1.QEyXG
.+7;)K
class CCaptureDlg : public CDialog mMsTyM-f
{ JD@J[YY5R
// Construction x~xa6
public: '!l1=cZD
BOOL bTray; G9g1hie@%
BOOL bRegistered; \fA{1
BOOL RegisterHotkey(); *Qugv^-
UCHAR cKey; G!K]W:m
UCHAR cMask; 0#w?HCx=
void DeleteIcon(); ,0x y\u
void AddIcon(); =]:> "_jN
UINT nCount; fP.F`V_Y
void SaveBmp(); [2"<W!p
CCaptureDlg(CWnd* pParent = NULL); // standard constructor X[f=h=|
// Dialog Data K>*a*[t0Sy
//{{AFX_DATA(CCaptureDlg) foJdu+^
enum { IDD = IDD_CAPTURE_DIALOG }; pZ/>[TP(%F
CComboBox m_Key; ^Z~;4il_F
BOOL m_bControl; Yjx|9_|Xn
BOOL m_bAlt; B}PIRk@a1
BOOL m_bShift; A&nU]R8S
CString m_Path; ^]{R.(#z
CString m_Number; E b=}FuV
//}}AFX_DATA d&Ef"H
// ClassWizard generated virtual function overrides *S/_i-ony
//{{AFX_VIRTUAL(CCaptureDlg) @)Ofi j
public: @}u9Rn*d;
virtual BOOL PreTranslateMessage(MSG* pMsg); ?O>V%@
protected: cJ54s}
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &hRvol\J
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Q+YRf3$
//}}AFX_VIRTUAL OE}*2P/M>
// Implementation (\SA*.)
protected: Mbb x`
HICON m_hIcon; ;3'.C~
// Generated message map functions S#+h$UVh
//{{AFX_MSG(CCaptureDlg) OF\rgz
virtual BOOL OnInitDialog(); ]\!?qsT3}
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $sEy%-
afx_msg void OnPaint(); ~R(%D-k
afx_msg HCURSOR OnQueryDragIcon(); |+T1XYG5
virtual void OnCancel(); U\Z?taXB
afx_msg void OnAbout(); `QXErw
afx_msg void OnBrowse(); 5H ue7'LS
afx_msg void OnChange(); P>Ez'C
//}}AFX_MSG b j'Xg
DECLARE_MESSAGE_MAP() f"<O0Qw
}; KN*
#endif ,lyb!k8
['T:ea6B
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file qzTuxo0B
#include "stdafx.h" ~c&bH]cj
#include "Capture.h" WVI{oso#
#include "CaptureDlg.h" hRCed4qA
#include <windowsx.h> 8?%-'z.
#pragma comment(lib,"hook.lib") %HL*c=
#ifdef _DEBUG 7k rUKYVo
#define new DEBUG_NEW <TP=oq?I/
#undef THIS_FILE IP(Vr7-v
static char THIS_FILE[] = __FILE__; [<6S%s
#endif 9T1ZL5
#define IDM_SHELL WM_USER+1 f`[R7Q5
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v-PXZ'7~
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :$n=$C-wp
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (JM5`XwM
class CAboutDlg : public CDialog Pqn@ST
{ uH(f$A
public: w'UVKpG+
CAboutDlg(); D}mjN=Y
// Dialog Data Jl&-,Vjb
//{{AFX_DATA(CAboutDlg) iB498t
enum { IDD = IDD_ABOUTBOX }; 43@{JK9G
//}}AFX_DATA zR{W?_cV
// ClassWizard generated virtual function overrides jJ5W>Q1mK$
//{{AFX_VIRTUAL(CAboutDlg) MerFZd 1
protected: `-p:vq`
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LS917ci-
//}}AFX_VIRTUAL @9lUSk^9
// Implementation 1
=M ?GDc
protected: ayfFVTy1d
//{{AFX_MSG(CAboutDlg) 4/wa+Y+=vt
//}}AFX_MSG Ym =FgM\
DECLARE_MESSAGE_MAP() vuoQz\
}; e8GEoD
])nPPf
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )s%[T-uKi
{ 3G(miP6
//{{AFX_DATA_INIT(CAboutDlg) P7{gfiB
//}}AFX_DATA_INIT x;8A!8w
} ZR(x%ews
<1t*I!e_
void CAboutDlg::DoDataExchange(CDataExchange* pDX) jW
3c"
{ xo7Kn+ Kl
CDialog::DoDataExchange(pDX); /JWGifH
//{{AFX_DATA_MAP(CAboutDlg) {o.FlX
//}}AFX_DATA_MAP pLLGus+W
} _t^{a]/H
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) "-vW,7y
//{{AFX_MSG_MAP(CAboutDlg) ]% IT|/;9Y
// No message handlers HBu[gh;b
//}}AFX_MSG_MAP N _86t
END_MESSAGE_MAP() '*"vkgN
Ht&:-F+dm
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v~@pMA$(h
: CDialog(CCaptureDlg::IDD, pParent) GJoS #s
{ V0P>YQq9s
//{{AFX_DATA_INIT(CCaptureDlg)
(q(~de
m_bControl = FALSE; "O%gFye
m_bAlt = FALSE; q)^Jj?W
m_bShift = FALSE; <w)r`D6
m_Path = _T("c:\\"); K otrX
m_Number = _T("0 picture captured."); -T[lx\}
nCount=0; fR*q?,
bRegistered=FALSE; A^y|J`k|
bTray=FALSE; 2C9V|[U,
//}}AFX_DATA_INIT tX>
G,hw
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;;:-l99
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &QGdLXOn
} <cqbUL
,^eYlmT>6
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) '8{Ne!y
{ ck.w
5|$
CDialog::DoDataExchange(pDX); NqDHCI
//{{AFX_DATA_MAP(CCaptureDlg) k6sI
L3QJ0
DDX_Control(pDX, IDC_KEY, m_Key); ]Zyur`
DDX_Check(pDX, IDC_CONTROL, m_bControl); RIY,K*f.
DDX_Check(pDX, IDC_ALT, m_bAlt); {O7X`'[
DDX_Check(pDX, IDC_SHIFT, m_bShift); (}EB2V9Hh
DDX_Text(pDX, IDC_PATH, m_Path); #w\~&0
DDX_Text(pDX, IDC_NUMBER, m_Number); 'Pn3%&O$
//}}AFX_DATA_MAP Pyb Z)5u
} T^~5n6
jO1r)hw N>
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %Ntcvp)
//{{AFX_MSG_MAP(CCaptureDlg) |!"`MIw,
ON_WM_SYSCOMMAND() * Of4o
ON_WM_PAINT() ZRg;/sX]
ON_WM_QUERYDRAGICON() G}:lzOlMH
ON_BN_CLICKED(ID_ABOUT, OnAbout) s1h/}
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *22nVKi{
ON_BN_CLICKED(ID_CHANGE, OnChange) b{]z
wpf
//}}AFX_MSG_MAP |,!IZ-
th
END_MESSAGE_MAP() E~gyy]8&
O2f-5Y$@
BOOL CCaptureDlg::OnInitDialog() >V*mr{/1
{ qCqFy#Ms\
CDialog::OnInitDialog();
.5y+fL
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }Hxd*S
ASSERT(IDM_ABOUTBOX < 0xF000); aM:nOt" S1
CMenu* pSysMenu = GetSystemMenu(FALSE); ( 8c9 /7h
if (pSysMenu != NULL) 7U2J xE
{ =aoMii
CString strAboutMenu; 6Qy@UfB
strAboutMenu.LoadString(IDS_ABOUTBOX); kAC&S!n
if (!strAboutMenu.IsEmpty()) k+8q{5>A<
{ s!}ne"&0
pSysMenu->AppendMenu(MF_SEPARATOR); jhg;%+KB
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); A?t%e
} < !dqTJos
} Hr]h
Jc
SetIcon(m_hIcon, TRUE); // Set big icon [ zEUH:9D
SetIcon(m_hIcon, FALSE); // Set small icon cQ"~\
m_Key.SetCurSel(0); HO}Hh[{V9
RegisterHotkey(); t[oT-r
CMenu* pMenu=GetSystemMenu(FALSE); o17ekML
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Tny%7xSx1
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 70;Jl).\{
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); dnb)/
return TRUE; // return TRUE unless you set the focus to a control ,J{ei7TN
} qAS qscO
$W9{P;
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) /i-J&*6_
{ 9=V:&.L
if ((nID & 0xFFF0) == IDM_ABOUTBOX) c(n&A~*AJ%
{ 846$x$G4
CAboutDlg dlgAbout; 3rcKzS7
dlgAbout.DoModal(); NX/;+{
} d)R:9M}v
else ]jaQ[g$F
{ [I$BmGQ
CDialog::OnSysCommand(nID, lParam); Qkd<sxL
} "Za>ZRR
} d_)o
jlBanGs?
void CCaptureDlg::OnPaint() weE/TW\e
{ aP8H`^DFX>
if (IsIconic()) -sjd&)~S[
{ 7"w2$*4 '0
CPaintDC dc(this); // device context for painting 5KDGSo
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); IuOgxm~Y
// Center icon in client rectangle L}}y'^(
int cxIcon = GetSystemMetrics(SM_CXICON); vt;{9\Y
int cyIcon = GetSystemMetrics(SM_CYICON); Zuw?58RE\
CRect rect; )d$glI+
GetClientRect(&rect); 5K<5kHpvJ{
int x = (rect.Width() - cxIcon + 1) / 2; Sk:ws&D1u
int y = (rect.Height() - cyIcon + 1) / 2; N\#MwLm
// Draw the icon lm xr oHE
dc.DrawIcon(x, y, m_hIcon); LF~*^n>
} 839IRM@'5
else |iR T!
]
{ B|4X}*@SX
CDialog::OnPaint(); sm\f0P!rv
} niqN{
} (q4),y<:[
91q8k=p
HCURSOR CCaptureDlg::OnQueryDragIcon() ;B?DfWX
{ O=$~O\}b
return (HCURSOR) m_hIcon; VA9Gb9
} Yb/i{@AJ
j8fpj {hp
void CCaptureDlg::OnCancel() FRS>KO=3
{ z%e8K(
if(bTray) +\|Iu;w
DeleteIcon(); XvE9b5}
CDialog::OnCancel(); lK4M.QV
?\
} -,+q#F
u6_@.a}
void CCaptureDlg::OnAbout() "7v @Rye
{ _x?uU
CAboutDlg dlg; o.'g]Q<}UB
dlg.DoModal(); n#:N;T;\a
} a9T@$:
S=nP[s
void CCaptureDlg::OnBrowse() gF0q@M y~
{ '2laTl]`
CString str; TU GNq
BROWSEINFO bi; Vm df8[5
char name[MAX_PATH]; GG0R}',0
ZeroMemory(&bi,sizeof(BROWSEINFO)); m@Qt.4m%g
bi.hwndOwner=GetSafeHwnd(); r} P<iX
bi.pszDisplayName=name; TD9;kN1`
bi.lpszTitle="Select folder"; 1I*7SkgKv
bi.ulFlags=BIF_RETURNONLYFSDIRS; x&`~R>5/
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2{Chu85
if(idl==NULL) m1IKVa7-\}
return; ~\cO"(y5:O
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =r.mlc``W
str.ReleaseBuffer(); 4WN3=B
m_Path=str; 1=nUW":
if(str.GetAt(str.GetLength()-1)!='\\') eh ,~F
m_Path+="\\"; vNeCpf
UpdateData(FALSE); t2V0lyeL
} I`w4Xrd
3 AHY|
void CCaptureDlg::SaveBmp() u- o--q
{ #!9S}b$
CDC dc; s
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dc.CreateDC("DISPLAY",NULL,NULL,NULL); 90#
;?#
CBitmap bm; {\z({Wlb]
int Width=GetSystemMetrics(SM_CXSCREEN); o d7]tOK9
int Height=GetSystemMetrics(SM_CYSCREEN); }HG#s4
bm.CreateCompatibleBitmap(&dc,Width,Height); xEltwuDd?
CDC tdc; YqV8D&I
tdc.CreateCompatibleDC(&dc); 6AP~]e 8
CBitmap*pOld=tdc.SelectObject(&bm); =B ];?%
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); t'~/$=9}
tdc.SelectObject(pOld); Dgql?+2$
BITMAP btm; +@Ad1fJi
bm.GetBitmap(&btm); jr /lk
DWORD size=btm.bmWidthBytes*btm.bmHeight; {Rear2
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); z**hD2R!
BITMAPINFOHEADER bih; IF +i3#$
bih.biBitCount=btm.bmBitsPixel; KZbR3mi,
bih.biClrImportant=0; MzYavg`
bih.biClrUsed=0; "0EA;S8$8
bih.biCompression=0; gUR]{dq^'
bih.biHeight=btm.bmHeight; QI!F6pGF
bih.biPlanes=1; E"|4Y(G
bih.biSize=sizeof(BITMAPINFOHEADER); 4<X!<]3]
bih.biSizeImage=size; XYH|;P6K
bih.biWidth=btm.bmWidth; !'f3>W\
bih.biXPelsPerMeter=0; =l9T7az
bih.biYPelsPerMeter=0; =1oNZKBP
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);
Q2p)7G
static int filecount=0;
I<=Df5M
CString name; U{ ;l0 2S
name.Format("pict%04d.bmp",filecount++); `aqrSH5^h
name=m_Path+name; A
K/z6XGy
BITMAPFILEHEADER bfh; q+a.G2S
bfh.bfReserved1=bfh.bfReserved2=0; ;U`X 6d
bfh.bfType=((WORD)('M'<< 8)|'B'); Z?^"\u-
bfh.bfSize=54+size; S :8OQI
bfh.bfOffBits=54; %gcc
y|
CFile bf; m~],nl
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ cE{ =(OQ
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); lM#A3/=K
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); >?YNW
bf.WriteHuge(lpData,size); 3P <'F2o
bf.Close(); !7U\J]
nCount++; !RlC~^
-
} WA)Ij(M8 p
GlobalFreePtr(lpData); R:aYL~
if(nCount==1) HhkN^S,
m_Number.Format("%d picture captured.",nCount); 1Xyp/X2rI
else z8Q"%@
m_Number.Format("%d pictures captured.",nCount); L|^o71t|
UpdateData(FALSE); kDB iBNdB
} {*/dD`
m&R"2t_Z
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) t#<KxwhcN
{ 8,o17}NY,
if(pMsg -> message == WM_KEYDOWN) 3SARr>HRyI
{ IX?ZbtdX$`
if(pMsg -> wParam == VK_ESCAPE) X^< >6|)
return TRUE; vZajT!h
if(pMsg -> wParam == VK_RETURN) 2[dIOb4b
return TRUE; 3ViM ?p
} ?An,-N-ezf
return CDialog::PreTranslateMessage(pMsg); B50 [O!
} 1.SkIu%
x.EgTvA&d
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 00M`%c/
{ hXX1<~k
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ <4zT;:NQ
SaveBmp(); IMad$AKc
return FALSE; DzPs!(5[I
} , deUsc
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){
q{X T
CMenu pop; O}gX{_|6
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Sl.o,W^
CMenu*pMenu=pop.GetSubMenu(0); ?mOg@) wx
pMenu->SetDefaultItem(ID_EXITICON); 8Inx/>eOI
CPoint pt; 'XTs
-=
GetCursorPos(&pt); <*YO~S(R
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); j,t~
if(id==ID_EXITICON) ek[kq[U9
DeleteIcon(); 797X71>
else if(id==ID_EXIT) vbKQ*
OnCancel(); bag&BHw
return FALSE; 0 [i+
} '\L0xw4
LRESULT res= CDialog::WindowProc(message, wParam, lParam); GEtbs+ [
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) k
]bPI$
AddIcon(); sA\L7`2H
return res; q2!'==h2i
} kV1vb
-]QguZE
void CCaptureDlg::AddIcon() cqk]NL`'
{ jvO3_Zt9
NOTIFYICONDATA data; Uk02IOXQ
data.cbSize=sizeof(NOTIFYICONDATA); wA r~<
CString tip; l7Y8b`
tip.LoadString(IDS_ICONTIP); O!];_q/
data.hIcon=GetIcon(0); !2tw, QM
data.hWnd=GetSafeHwnd(); i7f%^7!
strcpy(data.szTip,tip); M*H<
n*
data.uCallbackMessage=IDM_SHELL; <N5rv3
s
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &>V/X{>$`K
data.uID=98; /u?9S/
Shell_NotifyIcon(NIM_ADD,&data); ~T&%
VvI
ShowWindow(SW_HIDE); `x4E;Wjv
bTray=TRUE; u0'i!@795
} !^1[ s@1
[%t3[p<)O
void CCaptureDlg::DeleteIcon() s~)L_ p
{ J&
)#G@fRX
NOTIFYICONDATA data; +Tp%5+E
data.cbSize=sizeof(NOTIFYICONDATA); t5n2eOy~T
data.hWnd=GetSafeHwnd(); &!6DC5
data.uID=98;
363cuRP
Shell_NotifyIcon(NIM_DELETE,&data); bz$Qk;m=H
ShowWindow(SW_SHOW); QS5H>5M)
SetForegroundWindow(); o|+E+l9\
ShowWindow(SW_SHOWNORMAL); ?-d
Ain1w
bTray=FALSE; Kc-Y
} TMNfJz
2DUr7rM
void CCaptureDlg::OnChange() @Mzz2&(dU
{ 3y/1!A3
RegisterHotkey(); m,=)qex
} 9ptZVv=O
^t`f1rGR
BOOL CCaptureDlg::RegisterHotkey() T7^ulG1'
{ A"0wvk)UcY
UpdateData(); Uld_X\;Q4
UCHAR mask=0; <8g=BWA
UCHAR key=0; tK*%8I\s
if(m_bControl) ZU)BJ!L,s
mask|=4; Gee~>:_Q{J
if(m_bAlt) 6aRGG+H
mask|=2; fVG$8tB
if(m_bShift) &K+
mask|=1; 7Nd*,DV_
key=Key_Table[m_Key.GetCurSel()]; p}96uaC1
if(bRegistered){ KlY,NSlQ
DeleteHotkey(GetSafeHwnd(),cKey,cMask); kV_#9z7%
bRegistered=FALSE; =d}gv6v2S
} @k_Jl>X
cMask=mask; C:rRK*
cKey=key; |
A3U@>6
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Tt{U"EFO
return bRegistered; R:]/{b4Uq
} g[m3IJzq
;I[ht
四、小结 }Q!h ov
S&5Q~}{,
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。