FindMatchingFunction

PowerBuilder Native Interface

IPB_Session interface:

FindMatchingFunction method

Description

Finds a function that has the specified argument list.

Syntax

FindMatchingFunction(pbclass cls, LPCTSTR methodName, PBRoutineType rt, LPCTSTR readableSignature)

Argument	Description
cls	pbclass containing the method.
methodName	The string name of the method in lowercase.
rt	Type of the method: PBRT_FUNCTION for function or PBRT_EVENT for event.
readableSignature	A comma-separated string listing the types of the method's arguments. The return type of the method is not included in the string. See the Usage section for examples.

Return Values

pbmethodID.

Examples

This example returns the method ID of a function named uf_test that takes an integer and a double as arguments:

pbclass cls;
pbmethodID mid;
PBCallInfo* ci = new PBCallInfo;  
unsigned long ret_val;
 
cls = Session -> GetClass(myobj);
mid = Session -> FindMatchingFunction(cls, "uf_test",
   PBRT_FUNCTION, "int, double");
 
Session -> InitCallInfo(cls, mid, ci);

Usage

FindMatchingFunction provides an alternative to the GetMethodID function. It requires a list of the function's arguments (the readableSignature) instead of the signature obtained using the pbsig125 tool.

This table shows the readableSignature for each of several functions.

Table 7-3: FindMatchingFunction readable signature examples
Function prototype	Signature
`void test1()`	`""`
`int test2()`	`""`
`string test3(int a, double b)`	`"int, double"`
`datastore test4(powerobject a[], double b[2 to 10, 1 to 7])`	`"powerobject[], double[2 to 10, 1 to 7]"`
`int test5(readonly int a[10,20], ref long c[])`	`"readonly int[10,20], ref long[])"`

FindMatchingFunction does not check the access type of the function, so you can use it to obtain the method ID of a private function. GetMethodID cannot obtain the method ID of a private function.