This is the dynacall.dll that I described as "bringing back the Declare
statement" in VBScript. Basically it will allow you to call functions
in other dlls...like any of the win32 api functions. This will be my
only distribution.
Many thanks to Ton Plooy and Jeff Stong who wrote the code and published
it in WDJ. And more thanks to William Epp for getting it to work with my
sample script ccupd.vbs using the GETPROFILESTRING function. However I
have another function in the sample that still doesn't work
GETPROFILESECTION. This is a work in progress but I think it is a handy
little feature. Hopefully by this distributions it will get where it
needs to be. Clarence and Ian have offered to post it on their sites so
further updates can be had at either WSH site. (anyone else call this
thing woosh? Hopefully it will perform this way).
Basically you declare functions and other DLLS like this:
' Create the wrapper object for dynamic DLL function calling
Dim UserWrap
Set UserWrap = CreateObject("DynamicWrapper")
' GetProcAddress for GetPrivateProfileStringA()
UserWrap.Register "kernel32.DLL", "GetPrivateProfileString", "i=ssssls",
"f=s", "r=l"
The input parameters are:
i=describes the number and data type of the functions parameters
f=type of call _stdcall or _cdecl. So it can work with both MS C++ and
Borland C++. Default to _stdcall. If that doesn't work use _cdecl. If
that doesn't work good luck!
r=return data type.
Data types are:
const ARGTYPEINFO ArgInfo[] =
{
{'a', sizeof(IDispatch*), VT_DISPATCH}, // a IDispatch*
{'c', sizeof(unsigned char), VT_I4}, // c signed char
{'d', sizeof(double), VT_R8}, // d 8 byte real
{'f', sizeof(float), VT_R4}, // f 4 byte real
{'k', sizeof(IUnknown*), VT_UNKNOWN}, // k IUnknown*
{'h', sizeof(long), VT_I4}, // h HANDLE
{'l', sizeof(long), VT_I4}, // l long
{'p', sizeof(void*), VT_PTR}, // p pointer
{'s', sizeof(BSTR), VT_LPSTR}, // s string
{'t', sizeof(short), VT_I2}, // t short
{'u', sizeof(UINT), VT_UINT}, // u unsigned int
{'w', sizeof(BSTR), VT_LPWSTR}, // w wide string
}
William Epp added anr 'r' for VT_BYREF (pass by reference)but is for
strings only. This made the GETPROFILESTRING function to work. But it
didn't work for the GETPROFILESECTION. If anyone gets it to work please
let me know.
"i=llll", "f=s", "R=l"
Attachments:
stong.zip - original download from WDJ
DynaWrap.zip - the modified code, the DLL with modifications.
feature.htm - the feature article for this code by Jeff Stong. Only
thing I could find on WDJ. I couldn't find Ton's article.
再举几个简单的例子：
VB中对CopyFile这个api做的说明如下：
CopyFile
VB声明
Declare Function CopyFile Lib "kernel32" Alias "CopyFileA" (ByVal lpExistingFileName As String, ByVal lpNewFileName As String, ByVal bFailIfExists As Long) As Long
说明
复制文件。与vb的filecopy命令相似
返回值
Long，非零表示成功，零表示失败。会设置GetLastError
参数表
参数 类型及说明
lpExistingFileName String，源文件名
lpNewFileName String，目标文件名
bFailIfExists Long，如果设为TRUE（非零），那么一旦目标文件已经存在，则函数调用会失败。否则目标文件被改写
所以我们的vbs的代码就是:
Set Wrap = CreateObject("DynamicWrapper")
Wrap.Register "KERNEL32.DLL", "CopyFileA","i=ssl","R=l"
a=Wrap.CopyFileA ("c:\cctv.txt","c:\22.txt",1)
If a=1 Then MsgBox "copy 成功"
